pax_global_header00006660000000000000000000000064135415654340014524gustar00rootroot0000000000000052 comment=1d7765160379e602f0ad891257116c8967fb9e04 phpseclib-1.0.18/000077500000000000000000000000001354156543400135645ustar00rootroot00000000000000phpseclib-1.0.18/.gitignore000066400000000000000000000000451354156543400155530ustar00rootroot00000000000000/vendor /composer.phar composer.lock phpseclib-1.0.18/.travis.yml000066400000000000000000000025431354156543400157010ustar00rootroot00000000000000language: php matrix: include: - php: 5.4 dist: precise - php: 5.5.9 dist: trusty - php: 5.5 dist: trusty - php: 5.6 dist: xenial - php: 7.0 dist: xenial - php: 7.1 dist: xenial - php: 7.2 dist: xenial - php: 7.3 dist: xenial - php: 7.4snapshot dist: xenial env: global: # Defines CODE_COVERAGE_PASSPHRASE which is the passphrase for unlocking # the travis/code_coverage_id_rsa RSA private key. - secure: "jtQTZKQBnzUlp/jz7NlM6470ZDnLGVAs53sgvIm4tcYqf9TWSXSXjIYvFsrS\nKPR2eyZaAevYysUkIGRFTUXTlG6tC36YngMp9+6FPxASl8mnGXsTbKcm613B\n59vD3242pgIgqhhmgFQ0c8gbvnE8PuF2aS4/hluP3r+AxhWN56E=" before_install: true install: - wget http://ftp.gnu.org/gnu/parallel/parallel-20170822.tar.bz2 - tar -xvjf parallel* - cd parallel* - ./configure - make - sudo make install - cd .. - eval `ssh-agent -s` - travis/setup-secure-shell.sh - sh -c "if [ '$TRAVIS_PHP_VERSION' != 'hhvm' -a `php -r "echo (int) version_compare(PHP_VERSION, '7.0', '<');"` = "1" ]; then travis/install-php-extensions.sh; fi" - travis/setup-composer.sh script: - sh -c "if [ '$TRAVIS_PHP_VERSION' = '5.5' ]; then vendor/bin/phing -f build/build.xml sniff; fi" - travis/run-phpunit.sh after_success: - sh -c "if $TRAVIS_SECURE_ENV_VARS; then travis/upload-code-coverage-html.sh; fi" phpseclib-1.0.18/AUTHORS000066400000000000000000000004271354156543400146370ustar00rootroot00000000000000phpseclib Lead Developer: TerraFrost (Jim Wigginton) phpseclib Developers: monnerat (Patrick Monnerat) bantu (Andreas Fischer) petrich (Hans-Jürgen Petrich) GrahamCampbell (Graham Campbell) phpseclib-1.0.18/BACKERS.md000066400000000000000000000004531354156543400151620ustar00rootroot00000000000000# Backers phpseclib ongoing development is made possible by [Tidelift](https://tidelift.com/subscription/pkg/packagist-phpseclib-phpseclib?utm_source=packagist-phpseclib-phpseclib&utm_medium=referral&utm_campaign=readme) and by contributions by users like you. Thank you. ## Backers - Zane Hooperphpseclib-1.0.18/CHANGELOG.md000066400000000000000000000274521354156543400154070ustar00rootroot00000000000000# Changelog ## 1.0.18 - 2019-09-16 - SSH2: fix regression for connecting to servers with bad hostnames (#1405) ## 1.0.17 - 2019-09-15 - SSH2: backport setPreferredAlgorithms() / getAlgorithmsNegotiated (#1156) - SSH2 / SFTP: fix issues with ping() (#1402) - SSH2: only auto close the channel for exec() timeouts (#1384) - SSH2 / SFTP: fix issues with ping() (#1402) - SFTP: add progress callback to get() (#1375) - SFTP: fix array_merge(): Argument #1 is not an array error (#1379) - X509: IPs in nameconstraints extension include netmask (#1387) - X509: fix issue with explicit time tags whose maps expect implicit (#1388) - BigInteger: fix issues with divide method - BigInteger: fix bug with toBytes() with fixed precision negative numbers - fix PHP 7.4 deprecations ## 1.0.16 - 2019-06-13 - BigInteger: new BigInteger('-0') caused issues with GMP - BigInteger: new BigInteger('00') caused issues with GMP - BigInteger: GMP engine didn't always return 1 or -1 - ASN1: revamp how OIDs are handled (#1367) - ASN1: correctly handle long tags - SSH2: fix issue with reconnecting via ping() (#1353) - SSH2: close channel when a timeout occurs (#1378) - SFTP: improve handling of malformed packets (#1371) - RSA: add support for OpenSSH private keys (#1372) - RSA: use hash_equals if available ## 1.0.15 - 2019-03-10 - SFTP: make it so get() can correctly handle out of order responses (#1343) - Crypt: avoid bogus IV errors in ECB mode with OpenSSL (#1087) - RSA: protect against possible timing attack during OAEP decryption - RSA: fix possible memory leak with XML keys (#1346) - Hash: fix issues with the mode - SCP: issue error if remote_file is empty in put() call (#1335) - X509: whitelist OID 1.3.6.1.4.1.11129.2.4.2 (#1341) ## 1.0.14 - 2019-01-27 - SSH2: ssh-rsa is sometimes incorrectly used instead of rsa-sha2-256 (#1331) - SSH2: more strictly adhere to RFC8332 for rsa-sha2-256/512 (#1332) ## 1.0.13 - 2018-12-16 - SSH2: fix order of user_error() / bitmap reset (#1314) - SSH2: setTimeout(0) didn't work as intended (#1116) - Agent: add support for rsa-sha2-256 / rsa-sha2-512 (#1319) - Agent: add parameter to constructor (#1319) ## 1.0.12 - 2018-11-04 - SSH2: fixes relating to delayed global requests (#1271) - SSH2: setEngine -> setPreferredEngine (#1294) - SSH2: reset $this->bitmap when the connection fails (#1298) - SSH2: add ping() method (#1298) - SSH2: add support for rsa-sha2-256 / rsa-sha2-512 (RFC8332) - SFTP: make rawlist give same result regardless of stat cache (#1287) - Hash: save hashed keys for re-use ## 1.0.11 - 2018-04-15 - X509: auto download intermediate certs - BigInteger: fix for (new BigInteger(48))->toString(true)) (#1264) - ASN1: class is never set as key in _decode_ber ## 1.0.10 - 2018-02-08 - BigInteger: fix issue with bitwise_xor (#1245) - Crypt: some of the minimum lengths were off - SFTP: update stat cache accordingly when file becomes a directory (#1235) - SFTP: fix issue with extended attributes on 64-bit PHP installs (#1248) - SSH2: more channel handling updates (#1200) - X509: use anonymous functions in PHP >= 5.3.0 - X509: revise logic for validateSignature (#1213) - X509: fix 7.2 error when extensions were removed and new ones added (#1243) - fix float to int conversions on ARM CPU's (#1220) ## 1.0.9 - 2017-11-29 - SSH2: fix issue with key re-exchange - SSH2: updates to dealing with extraneous channel packets - X509: URL validation didn't work (#1203) ## 1.0.8 - 2017-10-22 - SSH2: - add new READ_NEXT mode (#1140) - add sendIdentificationStringFirst() - add sendKEXINITFirst() - add sendIdentificationStringLast() - add sendKEXINITLast() (#1162) - assume any SSH server >= 1.99 supports SSH2 (#1170) - workaround for bad arcfour256 implementations (#1171) - don't choke when getting response from diff channel in exec() (#1167) - SFTP: - add enablePathCanonicalization() - add disablePathCanonicalization() (#1137) - fix put() with remote file stream resource (#1177) - ANSI: misc fixes (#1150, #1161) - X509: use DateTime instead of unix time (#1166) - Ciphers: use eval() instead of create_function() for >= 5.3 ## 1.0.7 - 2017-06-05 - Crypt: fix OpenSSL engine on <= PHP 5.3.6 (#1122) - Random: suppress possible E_DEPRECATED errors - RSA: reset variables if bad key was loaded ## 1.0.6 - 2017-05-07 - SSH2: don't use timeout value of 0 for fsockopen (#775) - SSH2: make it so disabling PTY closes exec() channel if it's open (#1009) - SSH2: include `
` tags in getLog result when SAPI isn't CLI
- SFTP: don't assume current directory when $path parameter for delete is null (#1059)
- SFTP: fix put() with php://input as source (#1119)
- ASN1: fix UTCTime parsing (#1110)
- X509: ignore certificate transparency extension (#1073)
- Crypt: OpenSSL apparently supports variable size keys (#1085)

## 1.0.5 - 2016-10-22

- fix issue preventing installation of 1.0.x via Composer (#1048)

## 1.0.4 - 2016-10-03

- fix E_DEPRECATED errors on PHP 7.0 and 7.1 (#1041)
- fix float to int conversions on 32-bit Linux pre-PHP 5.3 (#1038, #1034)
- SFTP: speed up downloads (#945)
- SFTP: fix infinite loop when uploading empty file (#995)
- ASN1: fix possible infinite loop in decode (#1027)

## 1.0.3 - 2016-08-18

- BigInteger/RSA: don't compare openssl versions > 1.0 (#946)
- RSA: don't attempt to use the CRT when zero value components exist (#980)
- RSA: zero salt length RSA signatures don't work (#1002)
- ASN1: fix PHP Warning on PHP 7.1 (#1013)
- X509: set parameter fields to null for CSR's / RSA (#914)
- CRL optimizations (#1000)
- SSH2: fix "Expected SSH_FXP_STATUS or ..." error (#999)
- SFTP: make symlinks support relative target's (#1004)
- SFTP: fix sending stream resulting in zero byte file (#995)

## 1.0.2 - 2016-05-07

- All Ciphers: fix issue with CBC mode / OpenSSL / continuous buffers / decryption (#938)
- Random: fix issues with serialize() (#932)
- RC2: fix issue with decrypting
- RC4: fix issue with key not being truncated correctly
- SFTP: nlist() on a non-existent directory resulted in error
- SFTP: add is_writable, is_writeable, is_readable
- RSA: fix PHP4 compatibility issue

## 1.0.1 - 2016-01-18

- RSA: fix regression in PSS mode ([#769](https://github.com/phpseclib/phpseclib/pull/769))
- RSA: fix issue loading PKCS8 specific keys ([#861](https://github.com/phpseclib/phpseclib/pull/861))
- X509: add getOID() method ([#789](https://github.com/phpseclib/phpseclib/pull/789))
- X509: improve base64-encoded detection rules ([#855](https://github.com/phpseclib/phpseclib/pull/855))
- SFTP: fix quirky behavior with put() ([#830](https://github.com/phpseclib/phpseclib/pull/830))
- SFTP: fix E_NOTICE ([#883](https://github.com/phpseclib/phpseclib/pull/883))
- SFTP/Stream: fix issue with filenames with hashes ([#901](https://github.com/phpseclib/phpseclib/pull/901))
- SSH2: add isAuthenticated() method ([#897](https://github.com/phpseclib/phpseclib/pull/897))
- SSH/Agent: fix possible PHP warning ([#923](https://github.com/phpseclib/phpseclib/issues/923))
- BigInteger: add __debugInfo() magic method ([#881](https://github.com/phpseclib/phpseclib/pull/881))
- BigInteger: fix issue with doing bitwise not on 0
- add getBlockLength() method to symmetric ciphers

## 1.0.0 - 2015-08-02

- OpenSSL support for symmetric ciphers ([#507](https://github.com/phpseclib/phpseclib/pull/507))
- rewritten vt100 terminal emulator (File_ANSI) ([#689](https://github.com/phpseclib/phpseclib/pull/689))
- agent-forwarding support (System_SSH_Agent) ([#592](https://github.com/phpseclib/phpseclib/pull/592))
- Net_SSH2 improvements
  - diffie-hellman-group-exchange-sha1/sha256 support ([#714](https://github.com/phpseclib/phpseclib/pull/714))
  - window size handling updates ([#717](https://github.com/phpseclib/phpseclib/pull/717))
- Net_SFTP improvements
  - add callback support to put() ([#655](https://github.com/phpseclib/phpseclib/pull/655))
  - stat cache fixes ([#743](https://github.com/phpseclib/phpseclib/issues/743), [#730](https://github.com/phpseclib/phpseclib/issues/730), [#709](https://github.com/phpseclib/phpseclib/issues/709), [#726](https://github.com/phpseclib/phpseclib/issues/726))
- add "none" encryption mode to Crypt_RSA ([#692](https://github.com/phpseclib/phpseclib/pull/692))
- misc ASN.1 / X.509 parsing fixes ([#721](https://github.com/phpseclib/phpseclib/pull/721), [#627](https://github.com/phpseclib/phpseclib/pull/627))
- use a random serial number for new X509 certs ([#740](https://github.com/phpseclib/phpseclib/pull/740))
- add getPublicKeyFingerprint() to Crypt_RSA ([#677](https://github.com/phpseclib/phpseclib/pull/677))

## 0.3.10 - 2015-02-04

- simplify SSH2 window size handling ([#538](https://github.com/phpseclib/phpseclib/pull/538))
- slightly relax the conditions under which OpenSSL is used ([#598](https://github.com/phpseclib/phpseclib/pull/598))
- fix issue with empty constructed context-specific tags in ASN1 ([#606](https://github.com/phpseclib/phpseclib/pull/606))

## 0.3.9 - 2014-11-09

- PHP 5.6 improvements ([#482](https://github.com/phpseclib/phpseclib/pull/482), [#491](https://github.com/phpseclib/phpseclib/issues/491))

## 0.3.8 - 2014-09-12

- improve support for indef lengths in File_ASN1
- add hmac-sha2-256 support to Net_SSH2
- make it so negotiated algorithms can be seen before Net_SSH2 login
- add sha256-96 and sha512-96 to Crypt_Hash
- window size handling adjustments in Net_SSH2

## 0.3.7 - 2014-07-05

- auto-detect public vs private keys
- add file_exists, is_dir, is_file, readlink and symlink to Net_SFTP
- add support for recursive nlist and rawlist
- make it so nlist and rawlist can return pre-sorted output
- make it so callback functions can make exec() return early
- add signSPKAC and saveSPKAC methods to File_X509
- add support for PKCS8 keys in Crypt_RSA
- add pbkdf1 support to setPassword() in Crypt_Base
- add getWindowColumns, getWindowRows, setWindowColumns, setWindowRows to Net_SSH2
- add support for filenames with spaces in them to Net_SCP

## 0.3.6 - 2014-02-23

- add preliminary support for custom SSH subsystems
- add ssh-agent support

## 0.3.5 - 2013-07-11

- numerous SFTP changes:
  - chown
  - chgrp
  - truncate
  - improved file type detection
  - put() can write to the middle of a file
  - mkdir accepts the same parameters that PHP's mkdir does
  - the ability to upload/download 2GB files
- across-the-board speedups for the various encryption algorithms
- multi-factor authentication support for Net_SSH2
- a $callback parameter for Net_SSH2::exec
- new classes:
  - Net_SFTP_StreamWrapper
  - Net_SCP
  - Crypt_Twofish
  - Crypt_Blowfish

## 0.3.1 - 2012-11-20

- add Net_SSH2::enableQuietMode() for suppressing stderr
- add Crypt_RSA::__toString() and Crypt_RSA::getSize()
- fix problems with File_X509::validateDate(), File_X509::sign() and Crypt_RSA::verify()
- use OpenSSL to speed up modular exponention in Math_BigInteger
- improved timeout functionality in Net_SSH2
- add support for SFTPv2
- add support for CRLs in File_X509
- SSH-2.0-SSH doesn't implement hmac-*-96 correctly

## 0.3.0 - 2012-07-08

- add support for reuming Net_SFTP::put()
- add support for recursive deletes and recursive chmods to Net_SFTP
- add setTimeout() to Net_SSH2
- add support for PBKDF2 to the various Crypt_* classes via setPassword()
- add File_X509 and File_ASN1
- add the ability to decode various formats in Crypt_RSA
- make Net_SSH2::getServerPublicHostKey() return a printer-friendly version of the public key

## 0.2.2 - 2011-05-09

- CFB and OFB modes were added to all block ciphers
- support for interactive mode was added to Net_SSH2
- Net_SSH2 now has limited keyboard_interactive authentication support
- support was added for PuTTY formatted RSA private keys and XML formatted RSA private keys
- Crypt_RSA::loadKey() will now try all key types automatically
- add support for AES-128-CBC and DES-EDE3-CFB encrypted RSA private keys
- add Net_SFTP::stat(), Net_SFTP::lstat() and Net_SFTP::rawlist()
- logging was added to Net_SSH1
- the license was changed to the less restrictive MIT license
phpseclib-1.0.18/LICENSE000066400000000000000000000020711354156543400145710ustar00rootroot00000000000000Copyright (c) 2011-2019 TerraFrost and other contributors

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.phpseclib-1.0.18/README.md000066400000000000000000000053551354156543400150530ustar00rootroot00000000000000# phpseclib - PHP Secure Communications Library

[![Build Status](https://travis-ci.org/phpseclib/phpseclib.svg?branch=1.0)](https://travis-ci.org/phpseclib/phpseclib)

## Supporting phpseclib

- [Become a backer or sponsor on Patreon](https://www.patreon.com/phpseclib)
- [One-time donation via PayPal or crypto-currencies](http://sourceforge.net/donate/index.php?group_id=198487)
- [Subscribe to Tidelift](https://tidelift.com/subscription/pkg/packagist-phpseclib-phpseclib?utm_source=packagist-phpseclib-phpseclib&utm_medium=referral&utm_campaign=readme)

## Introduction

MIT-licensed pure-PHP implementations of an arbitrary-precision integer
arithmetic library, fully PKCS#1 (v2.1) compliant RSA, DES, 3DES, RC4, Rijndael,
AES, Blowfish, Twofish, SSH-1, SSH-2, SFTP, and X.509

* [Browse Git](https://github.com/phpseclib/phpseclib)
* [Code Coverage Report](https://coverage.phpseclib.org/1.0/latest/)

## Documentation

* [Documentation / Manual](http://phpseclib.sourceforge.net/)
* [API Documentation](https://api.phpseclib.org/1.0/) (generated by Sami)

## Branches

### master

* Development Branch
* Unstable API
* Do not use in production

### 2.0

* Long term support (LTS) release
* Modernized version of 1.0
* Minimum PHP version: 5.3.3
* PSR-4 autoloading with namespace rooted at `\phpseclib`
* Install via Composer: `composer require phpseclib/phpseclib:~2.0`

### 1.0

* Long term support (LTS) release
* PHP4 compatible
* Composer compatible (PSR-0 autoloading)
* Install using Composer: `composer require phpseclib/phpseclib:~1.0`
* Install using PEAR: See [phpseclib PEAR Channel Documentation](http://phpseclib.sourceforge.net/pear.htm)
* [Download 1.0.18 as ZIP](http://sourceforge.net/projects/phpseclib/files/phpseclib1.0.18.zip/download)

## Security contact information

To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.

## Support

Need Support?

* [Checkout Questions and Answers on Stack Overflow](http://stackoverflow.com/questions/tagged/phpseclib)
* [Create a Support Ticket on GitHub](https://github.com/phpseclib/phpseclib/issues/new)
* [Browse the Support Forum](http://www.frostjedi.com/phpbb/viewforum.php?f=46) (no longer in use)

## Contributing

1. Fork the Project

2. Ensure you have Composer installed (see [Composer Download Instructions](https://getcomposer.org/download/))

3. Install Development Dependencies

    ``` sh
    composer install
    ```

4. Create a Feature Branch

5. (Recommended) Run the Test Suite

    ``` sh
    vendor/bin/phpunit
    ```
6. (Recommended) Check whether your code conforms to our Coding Standards by running

    ``` sh
    vendor/bin/phing -f build/build.xml sniff
    ```

7. Send us a Pull Request
phpseclib-1.0.18/appveyor.yml000066400000000000000000000014271354156543400161600ustar00rootroot00000000000000build: false
shallow_clone: false
platform:
  - x86
  - x64
clone_folder: C:\projects\phpseclib

install:
  - cinst -y OpenSSL.Light
  - SET PATH=C:\Program Files\OpenSSL;%PATH%
  - sc config wuauserv start= auto
  - net start wuauserv
  - cinst -y php --version 5.6.30
  - cd c:\tools\php56
  - copy php.ini-production php.ini
  - echo date.timezone="UTC" >> php.ini
  - echo extension_dir=ext >> php.ini
  - echo extension=php_openssl.dll >> php.ini
  - echo extension=php_gmp.dll >> php.ini
  - cd C:\projects\phpseclib
  - SET PATH=C:\tools\php56;%PATH%
  - php.exe -r "readfile('http://getcomposer.org/installer');" | php.exe
  - php.exe composer.phar install --prefer-source --no-interaction

test_script:
  - cd C:\projects\phpseclib
  - vendor\bin\phpunit.bat tests/Windows32Test.phpphpseclib-1.0.18/build/000077500000000000000000000000001354156543400146635ustar00rootroot00000000000000phpseclib-1.0.18/build/build.xml000066400000000000000000000016351354156543400165110ustar00rootroot00000000000000


  

  
  
  
    
  
  
    
  

  
  
    
  


phpseclib-1.0.18/build/code-sniffer-ruleset-tests.xml000066400000000000000000000005101354156543400225660ustar00rootroot00000000000000


 phpseclib coding standard for tests

 
 
   
 


phpseclib-1.0.18/build/code-sniffer-ruleset.xml000066400000000000000000000031101354156543400214250ustar00rootroot00000000000000


 phpseclib coding standard

 
 
  
  
  
  
  

  
  
  
  
  
  

  
  
  
  

  
  
  
 

 

 
 

 
 


phpseclib-1.0.18/build/sami.conf.php000066400000000000000000000016061354156543400172540ustar00rootroot00000000000000classes[$name]);
    }
}

$iterator = Symfony\Component\Finder\Finder::create()
    ->files()
    ->name('*.php')
    ->in(__DIR__ . '/../phpseclib/')
;

$versions = Sami\Version\GitVersionCollection::create(__DIR__ . '/../')
    ->add('1.0')
    ->add('2.0')
    ->add('master')
;

return new Sami\Sami($iterator, array(
    'theme'                => 'enhanced',
    'versions'             => $versions,
    'title'                => 'phpseclib API Documentation',
    'build_dir'            => __DIR__.'/api/output/%version%',
    'cache_dir'            => __DIR__.'/api/cache/%version%',
    'default_opened_level' => 2,
    'store'                => new MyArrayStore,
));
phpseclib-1.0.18/composer.json000066400000000000000000000043561354156543400163160ustar00rootroot00000000000000{
    "name": "phpseclib/phpseclib",
    "type": "library",
    "description": "PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.",
    "keywords": [
        "security",
        "crypto",
        "cryptography",
        "encryption",
        "signature",
        "signing",
        "rsa",
        "aes",
        "blowfish",
        "twofish",
        "ssh",
        "sftp",
        "x509",
        "x.509",
        "asn1",
        "asn.1",
        "BigInteger"
        ],
    "homepage": "http://phpseclib.sourceforge.net",
    "license": "MIT",
    "authors": [
        {
            "name": "Jim Wigginton",
            "email": "terrafrost@php.net",
            "role": "Lead Developer"
        },
        {
            "name": "Patrick Monnerat",
            "email": "pm@datasphere.ch",
            "role": "Developer"
        },
        {
            "name": "Andreas Fischer",
            "email": "bantu@phpbb.com",
            "role": "Developer"
        },
        {
            "name": "Hans-Jürgen Petrich",
            "email": "petrich@tronic-media.com",
            "role": "Developer"
        },
        {
            "name": "Graham Campbell",
            "email": "graham@alt-three.com",
            "role": "Developer"
        }
    ],
    "require": {
        "php": ">=5.0.0"
    },
    "require-dev": {
        "phing/phing": "~2.7",
        "phpunit/phpunit": "^4.8.35|^5.7|^6.0",
        "sami/sami": "~2.0",
        "squizlabs/php_codesniffer": "~2.0"
    },
    "suggest": {
        "ext-mcrypt": "Install the Mcrypt extension in order to speed up a wide variety of cryptographic operations.",
        "ext-gmp": "Install the GMP (GNU Multiple Precision) extension in order to speed up arbitrary precision integer arithmetic operations.",
        "pear-pear/PHP_Compat": "Install PHP_Compat to get phpseclib working on PHP < 5.0.0."
    },
    "include-path": ["phpseclib/"],
    "autoload": {
        "psr-0": {
            "Crypt": "phpseclib/",
            "File": "phpseclib/",
            "Math": "phpseclib/",
            "Net": "phpseclib/",
            "System": "phpseclib/"
        },
        "files": [
            "phpseclib/bootstrap.php",
            "phpseclib/Crypt/Random.php"
        ]
    }
}
phpseclib-1.0.18/phpseclib/000077500000000000000000000000001354156543400155355ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/Crypt/000077500000000000000000000000001354156543400166365ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/Crypt/AES.php000066400000000000000000000140701354156543400177610ustar00rootroot00000000000000
 * setKey('abcdefghijklmnop');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $aes->decrypt($aes->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_AES
 * @author    Jim Wigginton 
 * @copyright 2008 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Rijndael
 */
if (!class_exists('Crypt_Rijndael')) {
    include_once 'Rijndael.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_AES_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_AES_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_AES_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_AES_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_AES_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of AES.
 *
 * @package Crypt_AES
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_AES extends Crypt_Rijndael
{
    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'AES';

    /**
     * Dummy function
     *
     * Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything.
     *
     * @see Crypt_Rijndael::setBlockLength()
     * @access public
     * @param int $length
     */
    function setBlockLength($length)
    {
        return;
    }

    /**
     * Sets the key length
     *
     * Valid key lengths are 128, 192, and 256.  If the length is less than 128, it will be rounded up to
     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
     *
     * @see Crypt_Rijndael:setKeyLength()
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        switch ($length) {
            case 160:
                $length = 192;
                break;
            case 224:
                $length = 256;
        }
        parent::setKeyLength($length);
    }

    /**
     * Sets the key.
     *
     * Rijndael supports five different key lengths, AES only supports three.
     *
     * @see Crypt_Rijndael:setKey()
     * @see setKeyLength()
     * @access public
     * @param string $key
     */
    function setKey($key)
    {
        parent::setKey($key);

        if (!$this->explicit_key_length) {
            $length = strlen($key);
            switch (true) {
                case $length <= 16:
                    $this->key_length = 16;
                    break;
                case $length <= 24:
                    $this->key_length = 24;
                    break;
                default:
                    $this->key_length = 32;
            }
            $this->_setEngine();
        }
    }
}
phpseclib-1.0.18/phpseclib/Crypt/Base.php000066400000000000000000003056021354156543400202270ustar00rootroot00000000000000
 * @author    Hans-Juergen Petrich 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_MODE_CTR', -1);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_MODE_ECB', 1);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_MODE_CBC', 2);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_MODE_CFB', 3);
/**
 * Encrypt / decrypt using the Output Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_MODE_OFB', 4);
/**
 * Encrypt / decrypt using streaming mode.
 */
define('CRYPT_MODE_STREAM', 5);
/**#@-*/

/**#@+
 * @access private
 * @see self::Crypt_Base()
 * @internal These constants are for internal use only
 */
/**
 * Base value for the internal implementation $engine switch
 */
define('CRYPT_ENGINE_INTERNAL', 1);
/**
 * Base value for the mcrypt implementation $engine switch
 */
define('CRYPT_ENGINE_MCRYPT', 2);
/**
 * Base value for the OpenSSL implementation $engine switch
 */
define('CRYPT_ENGINE_OPENSSL', 3);
/**#@-*/

/**
 * Base Class for all Crypt_* cipher classes
 *
 * @package Crypt_Base
 * @author  Jim Wigginton 
 * @author  Hans-Juergen Petrich 
 * @access  public
 */
class Crypt_Base
{
    /**
     * The Encryption Mode
     *
     * @see self::Crypt_Base()
     * @var int
     * @access private
     */
    var $mode;

    /**
     * The Block Length of the block cipher
     *
     * @var int
     * @access private
     */
    var $block_size = 16;

    /**
     * The Key
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";

    /**
     * The Initialization Vector
     *
     * @see self::setIV()
     * @var string
     * @access private
     */
    var $iv;

    /**
     * A "sliding" Initialization Vector
     *
     * @see self::enableContinuousBuffer()
     * @see self::_clearBuffers()
     * @var string
     * @access private
     */
    var $encryptIV;

    /**
     * A "sliding" Initialization Vector
     *
     * @see self::enableContinuousBuffer()
     * @see self::_clearBuffers()
     * @var string
     * @access private
     */
    var $decryptIV;

    /**
     * Continuous Buffer status
     *
     * @see self::enableContinuousBuffer()
     * @var bool
     * @access private
     */
    var $continuousBuffer = false;

    /**
     * Encryption buffer for CTR, OFB and CFB modes
     *
     * @see self::encrypt()
     * @see self::_clearBuffers()
     * @var array
     * @access private
     */
    var $enbuffer;

    /**
     * Decryption buffer for CTR, OFB and CFB modes
     *
     * @see self::decrypt()
     * @see self::_clearBuffers()
     * @var array
     * @access private
     */
    var $debuffer;

    /**
     * mcrypt resource for encryption
     *
     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
     *
     * @see self::encrypt()
     * @var resource
     * @access private
     */
    var $enmcrypt;

    /**
     * mcrypt resource for decryption
     *
     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
     *
     * @see self::decrypt()
     * @var resource
     * @access private
     */
    var $demcrypt;

    /**
     * Does the enmcrypt resource need to be (re)initialized?
     *
     * @see Crypt_Twofish::setKey()
     * @see Crypt_Twofish::setIV()
     * @var bool
     * @access private
     */
    var $enchanged = true;

    /**
     * Does the demcrypt resource need to be (re)initialized?
     *
     * @see Crypt_Twofish::setKey()
     * @see Crypt_Twofish::setIV()
     * @var bool
     * @access private
     */
    var $dechanged = true;

    /**
     * mcrypt resource for CFB mode
     *
     * mcrypt's CFB mode, in (and only in) buffered context,
     * is broken, so phpseclib implements the CFB mode by it self,
     * even when the mcrypt php extension is available.
     *
     * In order to do the CFB-mode work (fast) phpseclib
     * use a separate ECB-mode mcrypt resource.
     *
     * @link http://phpseclib.sourceforge.net/cfb-demo.phps
     * @see self::encrypt()
     * @see self::decrypt()
     * @see self::_setupMcrypt()
     * @var resource
     * @access private
     */
    var $ecb;

    /**
     * Optimizing value while CFB-encrypting
     *
     * Only relevant if $continuousBuffer enabled
     * and $engine == CRYPT_ENGINE_MCRYPT
     *
     * It's faster to re-init $enmcrypt if
     * $buffer bytes > $cfb_init_len than
     * using the $ecb resource furthermore.
     *
     * This value depends of the chosen cipher
     * and the time it would be needed for it's
     * initialization [by mcrypt_generic_init()]
     * which, typically, depends on the complexity
     * on its internaly Key-expanding algorithm.
     *
     * @see self::encrypt()
     * @var int
     * @access private
     */
    var $cfb_init_len = 600;

    /**
     * Does internal cipher state need to be (re)initialized?
     *
     * @see self::setKey()
     * @see self::setIV()
     * @see self::disableContinuousBuffer()
     * @var bool
     * @access private
     */
    var $changed = true;

    /**
     * Padding status
     *
     * @see self::enablePadding()
     * @var bool
     * @access private
     */
    var $padding = true;

    /**
     * Is the mode one that is paddable?
     *
     * @see self::Crypt_Base()
     * @var bool
     * @access private
     */
    var $paddable = false;

    /**
     * Holds which crypt engine internaly should be use,
     * which will be determined automatically on __construct()
     *
     * Currently available $engines are:
     * - CRYPT_ENGINE_OPENSSL  (very fast, php-extension: openssl, extension_loaded('openssl') required)
     * - CRYPT_ENGINE_MCRYPT   (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
     * - CRYPT_ENGINE_INTERNAL (slower, pure php-engine, no php-extension required)
     *
     * @see self::_setEngine()
     * @see self::encrypt()
     * @see self::decrypt()
     * @var int
     * @access private
     */
    var $engine;

    /**
     * Holds the preferred crypt engine
     *
     * @see self::_setEngine()
     * @see self::setPreferredEngine()
     * @var int
     * @access private
     */
    var $preferredEngine;

    /**
     * The mcrypt specific name of the cipher
     *
     * Only used if $engine == CRYPT_ENGINE_MCRYPT
     *
     * @link http://www.php.net/mcrypt_module_open
     * @link http://www.php.net/mcrypt_list_algorithms
     * @see self::_setupMcrypt()
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt;

    /**
     * The openssl specific name of the cipher
     *
     * Only used if $engine == CRYPT_ENGINE_OPENSSL
     *
     * @link http://www.php.net/openssl-get-cipher-methods
     * @var string
     * @access private
     */
    var $cipher_name_openssl;

    /**
     * The openssl specific name of the cipher in ECB mode
     *
     * If OpenSSL does not support the mode we're trying to use (CTR)
     * it can still be emulated with ECB mode.
     *
     * @link http://www.php.net/openssl-get-cipher-methods
     * @var string
     * @access private
     */
    var $cipher_name_openssl_ecb;

    /**
     * The default salt used by setPassword()
     *
     * @see self::setPassword()
     * @var string
     * @access private
     */
    var $password_default_salt = 'phpseclib/salt';

    /**
     * The namespace used by the cipher for its constants.
     *
     * ie: AES.php is using CRYPT_AES_MODE_* for its constants
     *     so $const_namespace is AES
     *
     *     DES.php is using CRYPT_DES_MODE_* for its constants
     *     so $const_namespace is DES... and so on
     *
     * All CRYPT_<$const_namespace>_MODE_* are aliases of
     * the generic CRYPT_MODE_* constants, so both could be used
     * for each cipher.
     *
     * Example:
     * $aes = new Crypt_AES(CRYPT_AES_MODE_CFB); // $aes will operate in cfb mode
     * $aes = new Crypt_AES(CRYPT_MODE_CFB);     // identical
     *
     * @see self::Crypt_Base()
     * @var string
     * @access private
     */
    var $const_namespace;

    /**
     * The name of the performance-optimized callback function
     *
     * Used by encrypt() / decrypt()
     * only if $engine == CRYPT_ENGINE_INTERNAL
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @see self::_setupInlineCrypt()
     * @see self::$use_inline_crypt
     * @var Callback
     * @access private
     */
    var $inline_crypt;

    /**
     * Holds whether performance-optimized $inline_crypt() can/should be used.
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @see self::inline_crypt
     * @var mixed
     * @access private
     */
    var $use_inline_crypt;

    /**
     * If OpenSSL can be used in ECB but not in CTR we can emulate CTR
     *
     * @see self::_openssl_ctr_process()
     * @var bool
     * @access private
     */
    var $openssl_emulate_ctr = false;

    /**
     * Determines what options are passed to openssl_encrypt/decrypt
     *
     * @see self::isValidEngine()
     * @var mixed
     * @access private
     */
    var $openssl_options;

    /**
     * Has the key length explicitly been set or should it be derived from the key, itself?
     *
     * @see self::setKeyLength()
     * @var bool
     * @access private
     */
    var $explicit_key_length = false;

    /**
     * Don't truncate / null pad key
     *
     * @see self::_clearBuffers()
     * @var bool
     * @access private
     */
    var $skip_key_adjustment = false;

    /**
     * Default Constructor.
     *
     * Determines whether or not the mcrypt extension should be used.
     *
     * $mode could be:
     *
     * - CRYPT_MODE_ECB
     *
     * - CRYPT_MODE_CBC
     *
     * - CRYPT_MODE_CTR
     *
     * - CRYPT_MODE_CFB
     *
     * - CRYPT_MODE_OFB
     *
     * (or the alias constants of the chosen cipher, for example for AES: CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC ...)
     *
     * If not explicitly set, CRYPT_MODE_CBC will be used.
     *
     * @param int $mode
     * @access public
     */
    function __construct($mode = CRYPT_MODE_CBC)
    {
        // $mode dependent settings
        switch ($mode) {
            case CRYPT_MODE_ECB:
                $this->paddable = true;
                $this->mode = CRYPT_MODE_ECB;
                break;
            case CRYPT_MODE_CTR:
            case CRYPT_MODE_CFB:
            case CRYPT_MODE_OFB:
            case CRYPT_MODE_STREAM:
                $this->mode = $mode;
                break;
            case CRYPT_MODE_CBC:
            default:
                $this->paddable = true;
                $this->mode = CRYPT_MODE_CBC;
        }

        $this->_setEngine();

        // Determining whether inline crypting can be used by the cipher
        if ($this->use_inline_crypt !== false) {
            $this->use_inline_crypt = version_compare(PHP_VERSION, '5.3.0') >= 0 || function_exists('create_function');
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param int $mode
     * @access public
     */
    function Crypt_Base($mode = CRYPT_MODE_CBC)
    {
        $this->__construct($mode);
    }

    /**
     * Sets the initialization vector. (optional)
     *
     * SetIV is not required when CRYPT_MODE_ECB (or ie for AES: CRYPT_AES_MODE_ECB) is being used.  If not explicitly set, it'll be assumed
     * to be all zero's.
     *
     * @access public
     * @param string $iv
     * @internal Can be overwritten by a sub class, but does not have to be
     */
    function setIV($iv)
    {
        if ($this->mode == CRYPT_MODE_ECB) {
            return;
        }

        $this->iv = $iv;
        $this->changed = true;
    }

    /**
     * Sets the key length.
     *
     * Keys with explicitly set lengths need to be treated accordingly
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        $this->explicit_key_length = true;
        $this->changed = true;
        $this->_setEngine();
    }

    /**
     * Returns the current key length in bits
     *
     * @access public
     * @return int
     */
    function getKeyLength()
    {
        return $this->key_length << 3;
    }

    /**
     * Returns the current block length in bits
     *
     * @access public
     * @return int
     */
    function getBlockLength()
    {
        return $this->block_size << 3;
    }

    /**
     * Sets the key.
     *
     * The min/max length(s) of the key depends on the cipher which is used.
     * If the key not fits the length(s) of the cipher it will paded with null bytes
     * up to the closest valid key length.  If the key is more than max length,
     * we trim the excess bits.
     *
     * If the key is not explicitly set, it'll be assumed to be all null bytes.
     *
     * @access public
     * @param string $key
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function setKey($key)
    {
        if (!$this->explicit_key_length) {
            $this->setKeyLength(strlen($key) << 3);
            $this->explicit_key_length = false;
        }

        $this->key = $key;
        $this->changed = true;
        $this->_setEngine();
    }

    /**
     * Sets the password.
     *
     * Depending on what $method is set to, setPassword()'s (optional) parameters are as follows:
     *     {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2} or pbkdf1:
     *         $hash, $salt, $count, $dkLen
     *
     *         Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
     *
     * @see Crypt/Hash.php
     * @param string $password
     * @param string $method
     * @return bool
     * @access public
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function setPassword($password, $method = 'pbkdf2')
    {
        $key = '';

        switch ($method) {
            default: // 'pbkdf2' or 'pbkdf1'
                $func_args = func_get_args();

                // Hash function
                $hash = isset($func_args[2]) ? $func_args[2] : 'sha1';

                // WPA and WPA2 use the SSID as the salt
                $salt = isset($func_args[3]) ? $func_args[3] : $this->password_default_salt;

                // RFC2898#section-4.2 uses 1,000 iterations by default
                // WPA and WPA2 use 4,096.
                $count = isset($func_args[4]) ? $func_args[4] : 1000;

                // Keylength
                if (isset($func_args[5]) && $func_args[5] > 0) {
                    $dkLen = $func_args[5];
                } else {
                    $dkLen = $method == 'pbkdf1' ? 2 * $this->key_length : $this->key_length;
                }

                switch (true) {
                    case $method == 'pbkdf1':
                        if (!class_exists('Crypt_Hash')) {
                            include_once 'Crypt/Hash.php';
                        }
                        $hashObj = new Crypt_Hash();
                        $hashObj->setHash($hash);
                        if ($dkLen > $hashObj->getLength()) {
                            user_error('Derived key too long');
                            return false;
                        }
                        $t = $password . $salt;
                        for ($i = 0; $i < $count; ++$i) {
                            $t = $hashObj->hash($t);
                        }
                        $key = substr($t, 0, $dkLen);

                        $this->setKey(substr($key, 0, $dkLen >> 1));
                        $this->setIV(substr($key, $dkLen >> 1));

                        return true;
                    // Determining if php[>=5.5.0]'s hash_pbkdf2() function avail- and useable
                    case !function_exists('hash_pbkdf2'):
                    case !function_exists('hash_algos'):
                    case !in_array($hash, hash_algos()):
                        if (!class_exists('Crypt_Hash')) {
                            include_once 'Crypt/Hash.php';
                        }
                        $i = 1;
                        $hmac = new Crypt_Hash();
                        $hmac->setHash($hash);
                        $hmac->setKey($password);
                        while (strlen($key) < $dkLen) {
                            $f = $u = $hmac->hash($salt . pack('N', $i++));
                            for ($j = 2; $j <= $count; ++$j) {
                                $u = $hmac->hash($u);
                                $f^= $u;
                            }
                            $key.= $f;
                        }
                        $key = substr($key, 0, $dkLen);
                        break;
                    default:
                        $key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true);
                }
        }

        $this->setKey($key);

        return true;
    }

    /**
     * Encrypts a message.
     *
     * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher
     * implementations may or may not pad in the same manner.  Other common approaches to padding and the reasons why it's
     * necessary are discussed in the following
     * URL:
     *
     * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
     *
     * An alternative to padding is to, separately, send the length of the file.  This is what SSH, in fact, does.
     * strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
     * length.
     *
     * @see self::decrypt()
     * @access public
     * @param string $plaintext
     * @return string $ciphertext
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function encrypt($plaintext)
    {
        if ($this->paddable) {
            $plaintext = $this->_pad($plaintext);
        }

        if ($this->engine === CRYPT_ENGINE_OPENSSL) {
            if ($this->changed) {
                $this->_clearBuffers();
                $this->changed = false;
            }
            switch ($this->mode) {
                case CRYPT_MODE_STREAM:
                    return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
                case CRYPT_MODE_ECB:
                    $result = @openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
                    return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
                case CRYPT_MODE_CBC:
                    $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
                    if (!defined('OPENSSL_RAW_DATA')) {
                        $result = substr($result, 0, -$this->block_size);
                    }
                    if ($this->continuousBuffer) {
                        $this->encryptIV = substr($result, -$this->block_size);
                    }
                    return $result;
                case CRYPT_MODE_CTR:
                    return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
                case CRYPT_MODE_CFB:
                    // cfb loosely routines inspired by openssl's:
                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
                    $ciphertext = '';
                    if ($this->continuousBuffer) {
                        $iv = &$this->encryptIV;
                        $pos = &$this->enbuffer['pos'];
                    } else {
                        $iv = $this->encryptIV;
                        $pos = 0;
                    }
                    $len = strlen($plaintext);
                    $i = 0;
                    if ($pos) {
                        $orig_pos = $pos;
                        $max = $this->block_size - $pos;
                        if ($len >= $max) {
                            $i = $max;
                            $len-= $max;
                            $pos = 0;
                        } else {
                            $i = $len;
                            $pos+= $len;
                            $len = 0;
                        }
                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
                        $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
                        $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
                        $plaintext = substr($plaintext, $i);
                    }

                    $overflow = $len % $this->block_size;

                    if ($overflow) {
                        $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
                        $iv = $this->_string_pop($ciphertext, $this->block_size);

                        $size = $len - $overflow;
                        $block = $iv ^ substr($plaintext, -$overflow);
                        $iv = substr_replace($iv, $block, 0, $overflow);
                        $ciphertext.= $block;
                        $pos = $overflow;
                    } elseif ($len) {
                        $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
                        $iv = substr($ciphertext, -$this->block_size);
                    }

                    return $ciphertext;
                case CRYPT_MODE_OFB:
                    return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
            }
        }

        if ($this->engine === CRYPT_ENGINE_MCRYPT) {
            if ($this->changed) {
                $this->_setupMcrypt();
                $this->changed = false;
            }
            if ($this->enchanged) {
                @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
                $this->enchanged = false;
            }

            // re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
            // using mcrypt's default handing of CFB the above would output two different things.  using phpseclib's
            // rewritten CFB implementation the above outputs the same thing twice.
            if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
                $block_size = $this->block_size;
                $iv = &$this->encryptIV;
                $pos = &$this->enbuffer['pos'];
                $len = strlen($plaintext);
                $ciphertext = '';
                $i = 0;
                if ($pos) {
                    $orig_pos = $pos;
                    $max = $block_size - $pos;
                    if ($len >= $max) {
                        $i = $max;
                        $len-= $max;
                        $pos = 0;
                    } else {
                        $i = $len;
                        $pos+= $len;
                        $len = 0;
                    }
                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
                    $this->enbuffer['enmcrypt_init'] = true;
                }
                if ($len >= $block_size) {
                    if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
                        if ($this->enbuffer['enmcrypt_init'] === true) {
                            @mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
                            $this->enbuffer['enmcrypt_init'] = false;
                        }
                        $ciphertext.= @mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
                        $iv = substr($ciphertext, -$block_size);
                        $len%= $block_size;
                    } else {
                        while ($len >= $block_size) {
                            $iv = @mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
                            $ciphertext.= $iv;
                            $len-= $block_size;
                            $i+= $block_size;
                        }
                    }
                }

                if ($len) {
                    $iv = @mcrypt_generic($this->ecb, $iv);
                    $block = $iv ^ substr($plaintext, -$len);
                    $iv = substr_replace($iv, $block, 0, $len);
                    $ciphertext.= $block;
                    $pos = $len;
                }

                return $ciphertext;
            }

            $ciphertext = @mcrypt_generic($this->enmcrypt, $plaintext);

            if (!$this->continuousBuffer) {
                @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
            }

            return $ciphertext;
        }

        if ($this->changed) {
            $this->_setup();
            $this->changed = false;
        }
        if ($this->use_inline_crypt) {
            $inline = $this->inline_crypt;
            return $inline('encrypt', $this, $plaintext);
        }

        $buffer = &$this->enbuffer;
        $block_size = $this->block_size;
        $ciphertext = '';
        switch ($this->mode) {
            case CRYPT_MODE_ECB:
                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                    $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
                }
                break;
            case CRYPT_MODE_CBC:
                $xor = $this->encryptIV;
                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                    $block = substr($plaintext, $i, $block_size);
                    $block = $this->_encryptBlock($block ^ $xor);
                    $xor = $block;
                    $ciphertext.= $block;
                }
                if ($this->continuousBuffer) {
                    $this->encryptIV = $xor;
                }
                break;
            case CRYPT_MODE_CTR:
                $xor = $this->encryptIV;
                if (strlen($buffer['ciphertext'])) {
                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                        $block = substr($plaintext, $i, $block_size);
                        if (strlen($block) > strlen($buffer['ciphertext'])) {
                            $buffer['ciphertext'].= $this->_encryptBlock($xor);
                        }
                        $this->_increment_str($xor);
                        $key = $this->_string_shift($buffer['ciphertext'], $block_size);
                        $ciphertext.= $block ^ $key;
                    }
                } else {
                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                        $block = substr($plaintext, $i, $block_size);
                        $key = $this->_encryptBlock($xor);
                        $this->_increment_str($xor);
                        $ciphertext.= $block ^ $key;
                    }
                }
                if ($this->continuousBuffer) {
                    $this->encryptIV = $xor;
                    if ($start = strlen($plaintext) % $block_size) {
                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
                    }
                }
                break;
            case CRYPT_MODE_CFB:
                // cfb loosely routines inspired by openssl's:
                // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
                if ($this->continuousBuffer) {
                    $iv = &$this->encryptIV;
                    $pos = &$buffer['pos'];
                } else {
                    $iv = $this->encryptIV;
                    $pos = 0;
                }
                $len = strlen($plaintext);
                $i = 0;
                if ($pos) {
                    $orig_pos = $pos;
                    $max = $block_size - $pos;
                    if ($len >= $max) {
                        $i = $max;
                        $len-= $max;
                        $pos = 0;
                    } else {
                        $i = $len;
                        $pos+= $len;
                        $len = 0;
                    }
                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
                }
                while ($len >= $block_size) {
                    $iv = $this->_encryptBlock($iv) ^ substr($plaintext, $i, $block_size);
                    $ciphertext.= $iv;
                    $len-= $block_size;
                    $i+= $block_size;
                }
                if ($len) {
                    $iv = $this->_encryptBlock($iv);
                    $block = $iv ^ substr($plaintext, $i);
                    $iv = substr_replace($iv, $block, 0, $len);
                    $ciphertext.= $block;
                    $pos = $len;
                }
                break;
            case CRYPT_MODE_OFB:
                $xor = $this->encryptIV;
                if (strlen($buffer['xor'])) {
                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                        $block = substr($plaintext, $i, $block_size);
                        if (strlen($block) > strlen($buffer['xor'])) {
                            $xor = $this->_encryptBlock($xor);
                            $buffer['xor'].= $xor;
                        }
                        $key = $this->_string_shift($buffer['xor'], $block_size);
                        $ciphertext.= $block ^ $key;
                    }
                } else {
                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                        $xor = $this->_encryptBlock($xor);
                        $ciphertext.= substr($plaintext, $i, $block_size) ^ $xor;
                    }
                    $key = $xor;
                }
                if ($this->continuousBuffer) {
                    $this->encryptIV = $xor;
                    if ($start = strlen($plaintext) % $block_size) {
                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
                    }
                }
                break;
            case CRYPT_MODE_STREAM:
                $ciphertext = $this->_encryptBlock($plaintext);
                break;
        }

        return $ciphertext;
    }

    /**
     * Decrypts a message.
     *
     * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
     * it is.
     *
     * @see self::encrypt()
     * @access public
     * @param string $ciphertext
     * @return string $plaintext
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function decrypt($ciphertext)
    {
        if ($this->paddable) {
            // we pad with chr(0) since that's what mcrypt_generic does.  to quote from {@link http://www.php.net/function.mcrypt-generic}:
            // "The data is padded with "\0" to make sure the length of the data is n * blocksize."
            $ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($this->block_size - strlen($ciphertext) % $this->block_size) % $this->block_size, chr(0));
        }

        if ($this->engine === CRYPT_ENGINE_OPENSSL) {
            if ($this->changed) {
                $this->_clearBuffers();
                $this->changed = false;
            }
            switch ($this->mode) {
                case CRYPT_MODE_STREAM:
                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
                    break;
                case CRYPT_MODE_ECB:
                    if (!defined('OPENSSL_RAW_DATA')) {
                        $ciphertext.= @openssl_encrypt('', $this->cipher_name_openssl_ecb, $this->key, true);
                    }
                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
                    break;
                case CRYPT_MODE_CBC:
                    if (!defined('OPENSSL_RAW_DATA')) {
                        $padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
                        $ciphertext.= substr(@openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size);
                        $offset = 2 * $this->block_size;
                    } else {
                        $offset = $this->block_size;
                    }
                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
                    if ($this->continuousBuffer) {
                        $this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
                    }
                    break;
                case CRYPT_MODE_CTR:
                    $plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
                    break;
                case CRYPT_MODE_CFB:
                    // cfb loosely routines inspired by openssl's:
                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
                    $plaintext = '';
                    if ($this->continuousBuffer) {
                        $iv = &$this->decryptIV;
                        $pos = &$this->buffer['pos'];
                    } else {
                        $iv = $this->decryptIV;
                        $pos = 0;
                    }
                    $len = strlen($ciphertext);
                    $i = 0;
                    if ($pos) {
                        $orig_pos = $pos;
                        $max = $this->block_size - $pos;
                        if ($len >= $max) {
                            $i = $max;
                            $len-= $max;
                            $pos = 0;
                        } else {
                            $i = $len;
                            $pos+= $len;
                            $len = 0;
                        }
                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $this->blocksize
                        $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
                        $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
                        $ciphertext = substr($ciphertext, $i);
                    }
                    $overflow = $len % $this->block_size;
                    if ($overflow) {
                        $plaintext.= openssl_decrypt(substr($ciphertext, 0, -$overflow), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
                        if ($len - $overflow) {
                            $iv = substr($ciphertext, -$overflow - $this->block_size, -$overflow);
                        }
                        $iv = openssl_encrypt(str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
                        $plaintext.= $iv ^ substr($ciphertext, -$overflow);
                        $iv = substr_replace($iv, substr($ciphertext, -$overflow), 0, $overflow);
                        $pos = $overflow;
                    } elseif ($len) {
                        $plaintext.= openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
                        $iv = substr($ciphertext, -$this->block_size);
                    }
                    break;
                case CRYPT_MODE_OFB:
                    $plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
            }

            return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
        }

        if ($this->engine === CRYPT_ENGINE_MCRYPT) {
            $block_size = $this->block_size;
            if ($this->changed) {
                $this->_setupMcrypt();
                $this->changed = false;
            }
            if ($this->dechanged) {
                @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
                $this->dechanged = false;
            }

            if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
                $iv = &$this->decryptIV;
                $pos = &$this->debuffer['pos'];
                $len = strlen($ciphertext);
                $plaintext = '';
                $i = 0;
                if ($pos) {
                    $orig_pos = $pos;
                    $max = $block_size - $pos;
                    if ($len >= $max) {
                        $i = $max;
                        $len-= $max;
                        $pos = 0;
                    } else {
                        $i = $len;
                        $pos+= $len;
                        $len = 0;
                    }
                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
                }
                if ($len >= $block_size) {
                    $cb = substr($ciphertext, $i, $len - $len % $block_size);
                    $plaintext.= @mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
                    $iv = substr($cb, -$block_size);
                    $len%= $block_size;
                }
                if ($len) {
                    $iv = @mcrypt_generic($this->ecb, $iv);
                    $plaintext.= $iv ^ substr($ciphertext, -$len);
                    $iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
                    $pos = $len;
                }

                return $plaintext;
            }

            $plaintext = @mdecrypt_generic($this->demcrypt, $ciphertext);

            if (!$this->continuousBuffer) {
                @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
            }

            return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
        }

        if ($this->changed) {
            $this->_setup();
            $this->changed = false;
        }
        if ($this->use_inline_crypt) {
            $inline = $this->inline_crypt;
            return $inline('decrypt', $this, $ciphertext);
        }

        $block_size = $this->block_size;

        $buffer = &$this->debuffer;
        $plaintext = '';
        switch ($this->mode) {
            case CRYPT_MODE_ECB:
                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                    $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
                }
                break;
            case CRYPT_MODE_CBC:
                $xor = $this->decryptIV;
                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                    $block = substr($ciphertext, $i, $block_size);
                    $plaintext.= $this->_decryptBlock($block) ^ $xor;
                    $xor = $block;
                }
                if ($this->continuousBuffer) {
                    $this->decryptIV = $xor;
                }
                break;
            case CRYPT_MODE_CTR:
                $xor = $this->decryptIV;
                if (strlen($buffer['ciphertext'])) {
                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                        $block = substr($ciphertext, $i, $block_size);
                        if (strlen($block) > strlen($buffer['ciphertext'])) {
                            $buffer['ciphertext'].= $this->_encryptBlock($xor);
                            $this->_increment_str($xor);
                        }
                        $key = $this->_string_shift($buffer['ciphertext'], $block_size);
                        $plaintext.= $block ^ $key;
                    }
                } else {
                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                        $block = substr($ciphertext, $i, $block_size);
                        $key = $this->_encryptBlock($xor);
                        $this->_increment_str($xor);
                        $plaintext.= $block ^ $key;
                    }
                }
                if ($this->continuousBuffer) {
                    $this->decryptIV = $xor;
                    if ($start = strlen($ciphertext) % $block_size) {
                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
                    }
                }
                break;
            case CRYPT_MODE_CFB:
                if ($this->continuousBuffer) {
                    $iv = &$this->decryptIV;
                    $pos = &$buffer['pos'];
                } else {
                    $iv = $this->decryptIV;
                    $pos = 0;
                }
                $len = strlen($ciphertext);
                $i = 0;
                if ($pos) {
                    $orig_pos = $pos;
                    $max = $block_size - $pos;
                    if ($len >= $max) {
                        $i = $max;
                        $len-= $max;
                        $pos = 0;
                    } else {
                        $i = $len;
                        $pos+= $len;
                        $len = 0;
                    }
                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
                }
                while ($len >= $block_size) {
                    $iv = $this->_encryptBlock($iv);
                    $cb = substr($ciphertext, $i, $block_size);
                    $plaintext.= $iv ^ $cb;
                    $iv = $cb;
                    $len-= $block_size;
                    $i+= $block_size;
                }
                if ($len) {
                    $iv = $this->_encryptBlock($iv);
                    $plaintext.= $iv ^ substr($ciphertext, $i);
                    $iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
                    $pos = $len;
                }
                break;
            case CRYPT_MODE_OFB:
                $xor = $this->decryptIV;
                if (strlen($buffer['xor'])) {
                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                        $block = substr($ciphertext, $i, $block_size);
                        if (strlen($block) > strlen($buffer['xor'])) {
                            $xor = $this->_encryptBlock($xor);
                            $buffer['xor'].= $xor;
                        }
                        $key = $this->_string_shift($buffer['xor'], $block_size);
                        $plaintext.= $block ^ $key;
                    }
                } else {
                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
                        $xor = $this->_encryptBlock($xor);
                        $plaintext.= substr($ciphertext, $i, $block_size) ^ $xor;
                    }
                    $key = $xor;
                }
                if ($this->continuousBuffer) {
                    $this->decryptIV = $xor;
                    if ($start = strlen($ciphertext) % $block_size) {
                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
                    }
                }
                break;
            case CRYPT_MODE_STREAM:
                $plaintext = $this->_decryptBlock($ciphertext);
                break;
        }
        return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
    }

    /**
     * OpenSSL CTR Processor
     *
     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
     * for CTR is the same for both encrypting and decrypting this function is re-used by both Crypt_Base::encrypt()
     * and Crypt_Base::decrypt(). Also, OpenSSL doesn't implement CTR for all of it's symmetric ciphers so this
     * function will emulate CTR with ECB when necessary.
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @param string $plaintext
     * @param string $encryptIV
     * @param array $buffer
     * @return string
     * @access private
     */
    function _openssl_ctr_process($plaintext, &$encryptIV, &$buffer)
    {
        $ciphertext = '';

        $block_size = $this->block_size;
        $key = $this->key;

        if ($this->openssl_emulate_ctr) {
            $xor = $encryptIV;
            if (strlen($buffer['ciphertext'])) {
                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                    $block = substr($plaintext, $i, $block_size);
                    if (strlen($block) > strlen($buffer['ciphertext'])) {
                        $result = @openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
                        $result = !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
                        $buffer['ciphertext'].= $result;
                    }
                    $this->_increment_str($xor);
                    $otp = $this->_string_shift($buffer['ciphertext'], $block_size);
                    $ciphertext.= $block ^ $otp;
                }
            } else {
                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                    $block = substr($plaintext, $i, $block_size);
                    $otp = @openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
                    $otp = !defined('OPENSSL_RAW_DATA') ? substr($otp, 0, -$this->block_size) : $otp;
                    $this->_increment_str($xor);
                    $ciphertext.= $block ^ $otp;
                }
            }
            if ($this->continuousBuffer) {
                $encryptIV = $xor;
                if ($start = strlen($plaintext) % $block_size) {
                    $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
                }
            }

            return $ciphertext;
        }

        if (strlen($buffer['ciphertext'])) {
            $ciphertext = $plaintext ^ $this->_string_shift($buffer['ciphertext'], strlen($plaintext));
            $plaintext = substr($plaintext, strlen($ciphertext));

            if (!strlen($plaintext)) {
                return $ciphertext;
            }
        }

        $overflow = strlen($plaintext) % $block_size;
        if ($overflow) {
            $plaintext2 = $this->_string_pop($plaintext, $overflow); // ie. trim $plaintext to a multiple of $block_size and put rest of $plaintext in $plaintext2
            $encrypted = openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
            $temp = $this->_string_pop($encrypted, $block_size);
            $ciphertext.= $encrypted . ($plaintext2 ^ $temp);
            if ($this->continuousBuffer) {
                $buffer['ciphertext'] = substr($temp, $overflow);
                $encryptIV = $temp;
            }
        } elseif (!strlen($buffer['ciphertext'])) {
            $ciphertext.= openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
            $temp = $this->_string_pop($ciphertext, $block_size);
            if ($this->continuousBuffer) {
                $encryptIV = $temp;
            }
        }
        if ($this->continuousBuffer) {
            if (!defined('OPENSSL_RAW_DATA')) {
                $encryptIV.= @openssl_encrypt('', $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
            }
            $encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
            if ($overflow) {
                $this->_increment_str($encryptIV);
            }
        }

        return $ciphertext;
    }

    /**
     * OpenSSL OFB Processor
     *
     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
     * for OFB is the same for both encrypting and decrypting this function is re-used by both Crypt_Base::encrypt()
     * and Crypt_Base::decrypt().
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @param string $plaintext
     * @param string $encryptIV
     * @param array $buffer
     * @return string
     * @access private
     */
    function _openssl_ofb_process($plaintext, &$encryptIV, &$buffer)
    {
        if (strlen($buffer['xor'])) {
            $ciphertext = $plaintext ^ $buffer['xor'];
            $buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
            $plaintext = substr($plaintext, strlen($ciphertext));
        } else {
            $ciphertext = '';
        }

        $block_size = $this->block_size;

        $len = strlen($plaintext);
        $key = $this->key;
        $overflow = $len % $block_size;

        if (strlen($plaintext)) {
            if ($overflow) {
                $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
                $xor = $this->_string_pop($ciphertext, $block_size);
                if ($this->continuousBuffer) {
                    $encryptIV = $xor;
                }
                $ciphertext.= $this->_string_shift($xor, $overflow) ^ substr($plaintext, -$overflow);
                if ($this->continuousBuffer) {
                    $buffer['xor'] = $xor;
                }
            } else {
                $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
                if ($this->continuousBuffer) {
                    $encryptIV = substr($ciphertext, -$block_size) ^ substr($plaintext, -$block_size);
                }
            }
        }

        return $ciphertext;
    }

    /**
     * phpseclib <-> OpenSSL Mode Mapper
     *
     * May need to be overwritten by classes extending this one in some cases
     *
     * @return int
     * @access private
     */
    function _openssl_translate_mode()
    {
        switch ($this->mode) {
            case CRYPT_MODE_ECB:
                return 'ecb';
            case CRYPT_MODE_CBC:
                return 'cbc';
            case CRYPT_MODE_CTR:
                return 'ctr';
            case CRYPT_MODE_CFB:
                return 'cfb';
            case CRYPT_MODE_OFB:
                return 'ofb';
        }
    }

    /**
     * Pad "packets".
     *
     * Block ciphers working by encrypting between their specified [$this->]block_size at a time
     * If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
     * pad the input so that it is of the proper length.
     *
     * Padding is enabled by default.  Sometimes, however, it is undesirable to pad strings.  Such is the case in SSH,
     * where "packets" are padded with random bytes before being encrypted.  Unpad these packets and you risk stripping
     * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
     * transmitted separately)
     *
     * @see self::disablePadding()
     * @access public
     */
    function enablePadding()
    {
        $this->padding = true;
    }

    /**
     * Do not pad packets.
     *
     * @see self::enablePadding()
     * @access public
     */
    function disablePadding()
    {
        $this->padding = false;
    }

    /**
     * Treat consecutive "packets" as if they are a continuous buffer.
     *
     * Say you have a 32-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
     * will yield different outputs:
     *
     * 
     *    echo $rijndael->encrypt(substr($plaintext,  0, 16));
     *    echo $rijndael->encrypt(substr($plaintext, 16, 16));
     * 
     * 
     *    echo $rijndael->encrypt($plaintext);
     * 
     *
     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
     * another, as demonstrated with the following:
     *
     * 
     *    $rijndael->encrypt(substr($plaintext, 0, 16));
     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
     * 
     * 
     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
     * 
     *
     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
     *
     * Put another way, when the continuous buffer is enabled, the state of the Crypt_*() object changes after each
     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
     * however, they are also less intuitive and more likely to cause you problems.
     *
     * @see self::disableContinuousBuffer()
     * @access public
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function enableContinuousBuffer()
    {
        if ($this->mode == CRYPT_MODE_ECB) {
            return;
        }

        $this->continuousBuffer = true;

        $this->_setEngine();
    }

    /**
     * Treat consecutive packets as if they are a discontinuous buffer.
     *
     * The default behavior.
     *
     * @see self::enableContinuousBuffer()
     * @access public
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function disableContinuousBuffer()
    {
        if ($this->mode == CRYPT_MODE_ECB) {
            return;
        }
        if (!$this->continuousBuffer) {
            return;
        }

        $this->continuousBuffer = false;
        $this->changed = true;

        $this->_setEngine();
    }

    /**
     * Test for engine validity
     *
     * @see self::Crypt_Base()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        switch ($engine) {
            case CRYPT_ENGINE_OPENSSL:
                if ($this->mode == CRYPT_MODE_STREAM && $this->continuousBuffer) {
                    return false;
                }
                $this->openssl_emulate_ctr = false;
                $result = $this->cipher_name_openssl &&
                          extension_loaded('openssl') &&
                          // PHP 5.3.0 - 5.3.2 did not let you set IV's
                          version_compare(PHP_VERSION, '5.3.3', '>=');
                if (!$result) {
                    return false;
                }

                // prior to PHP 5.4.0 OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING were not defined. instead of expecting an integer
                // $options openssl_encrypt expected a boolean $raw_data.
                if (!defined('OPENSSL_RAW_DATA')) {
                    $this->openssl_options = true;
                } else {
                    $this->openssl_options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
                }

                $methods = openssl_get_cipher_methods();
                if (in_array($this->cipher_name_openssl, $methods)) {
                    return true;
                }
                // not all of openssl's symmetric cipher's support ctr. for those
                // that don't we'll emulate it
                switch ($this->mode) {
                    case CRYPT_MODE_CTR:
                        if (in_array($this->cipher_name_openssl_ecb, $methods)) {
                            $this->openssl_emulate_ctr = true;
                            return true;
                        }
                }
                return false;
            case CRYPT_ENGINE_MCRYPT:
                return $this->cipher_name_mcrypt &&
                       extension_loaded('mcrypt') &&
                       in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms());
            case CRYPT_ENGINE_INTERNAL:
                return true;
        }

        return false;
    }

    /**
     * Sets the preferred crypt engine
     *
     * Currently, $engine could be:
     *
     * - CRYPT_ENGINE_OPENSSL  [very fast]
     *
     * - CRYPT_ENGINE_MCRYPT   [fast]
     *
     * - CRYPT_ENGINE_INTERNAL [slow]
     *
     * If the preferred crypt engine is not available the fastest available one will be used
     *
     * @see self::Crypt_Base()
     * @param int $engine
     * @access public
     */
    function setPreferredEngine($engine)
    {
        switch ($engine) {
            //case CRYPT_ENGINE_OPENSSL:
            case CRYPT_ENGINE_MCRYPT:
            case CRYPT_ENGINE_INTERNAL:
                $this->preferredEngine = $engine;
                break;
            default:
                $this->preferredEngine = CRYPT_ENGINE_OPENSSL;
        }

        $this->_setEngine();
    }

    /**
     * Returns the engine currently being utilized
     *
     * @see self::_setEngine()
     * @access public
     */
    function getEngine()
    {
        return $this->engine;
    }

    /**
     * Sets the engine as appropriate
     *
     * @see self::Crypt_Base()
     * @access private
     */
    function _setEngine()
    {
        $this->engine = null;

        $candidateEngines = array(
            $this->preferredEngine,
            CRYPT_ENGINE_OPENSSL,
            CRYPT_ENGINE_MCRYPT
        );
        foreach ($candidateEngines as $engine) {
            if ($this->isValidEngine($engine)) {
                $this->engine = $engine;
                break;
            }
        }
        if (!$this->engine) {
            $this->engine = CRYPT_ENGINE_INTERNAL;
        }

        if ($this->engine != CRYPT_ENGINE_MCRYPT && $this->enmcrypt) {
            // Closing the current mcrypt resource(s). _mcryptSetup() will, if needed,
            // (re)open them with the module named in $this->cipher_name_mcrypt
            @mcrypt_module_close($this->enmcrypt);
            @mcrypt_module_close($this->demcrypt);
            $this->enmcrypt = null;
            $this->demcrypt = null;

            if ($this->ecb) {
                @mcrypt_module_close($this->ecb);
                $this->ecb = null;
            }
        }

        $this->changed = true;
    }

    /**
     * Encrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     * @internal Must be extended by the child Crypt_* class
     */
    function _encryptBlock($in)
    {
        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
    }

    /**
     * Decrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     * @internal Must be extended by the child Crypt_* class
     */
    function _decryptBlock($in)
    {
        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
    }

    /**
     * Setup the key (expansion)
     *
     * Only used if $engine == CRYPT_ENGINE_INTERNAL
     *
     * @see self::_setup()
     * @access private
     * @internal Must be extended by the child Crypt_* class
     */
    function _setupKey()
    {
        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
    }

    /**
     * Setup the CRYPT_ENGINE_INTERNAL $engine
     *
     * (re)init, if necessary, the internal cipher $engine and flush all $buffers
     * Used (only) if $engine == CRYPT_ENGINE_INTERNAL
     *
     * _setup() will be called each time if $changed === true
     * typically this happens when using one or more of following public methods:
     *
     * - setKey()
     *
     * - setIV()
     *
     * - disableContinuousBuffer()
     *
     * - First run of encrypt() / decrypt() with no init-settings
     *
     * @see self::setKey()
     * @see self::setIV()
     * @see self::disableContinuousBuffer()
     * @access private
     * @internal _setup() is always called before en/decryption.
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function _setup()
    {
        $this->_clearBuffers();
        $this->_setupKey();

        if ($this->use_inline_crypt) {
            $this->_setupInlineCrypt();
        }
    }

    /**
     * Setup the CRYPT_ENGINE_MCRYPT $engine
     *
     * (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
     * Used (only) if $engine = CRYPT_ENGINE_MCRYPT
     *
     * _setupMcrypt() will be called each time if $changed === true
     * typically this happens when using one or more of following public methods:
     *
     * - setKey()
     *
     * - setIV()
     *
     * - disableContinuousBuffer()
     *
     * - First run of encrypt() / decrypt()
     *
     * @see self::setKey()
     * @see self::setIV()
     * @see self::disableContinuousBuffer()
     * @access private
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function _setupMcrypt()
    {
        $this->_clearBuffers();
        $this->enchanged = $this->dechanged = true;

        if (!isset($this->enmcrypt)) {
            static $mcrypt_modes = array(
                CRYPT_MODE_CTR    => 'ctr',
                CRYPT_MODE_ECB    => MCRYPT_MODE_ECB,
                CRYPT_MODE_CBC    => MCRYPT_MODE_CBC,
                CRYPT_MODE_CFB    => 'ncfb',
                CRYPT_MODE_OFB    => MCRYPT_MODE_NOFB,
                CRYPT_MODE_STREAM => MCRYPT_MODE_STREAM,
            );

            $this->demcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
            $this->enmcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');

            // we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
            // to workaround mcrypt's broken ncfb implementation in buffered mode
            // see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
            if ($this->mode == CRYPT_MODE_CFB) {
                $this->ecb = @mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
            }
        } // else should mcrypt_generic_deinit be called?

        if ($this->mode == CRYPT_MODE_CFB) {
            @mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
        }
    }

    /**
     * Pads a string
     *
     * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
     * $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to
     * chr($this->block_size - (strlen($text) % $this->block_size)
     *
     * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
     * and padding will, hence forth, be enabled.
     *
     * @see self::_unpad()
     * @param string $text
     * @access private
     * @return string
     */
    function _pad($text)
    {
        $length = strlen($text);

        if (!$this->padding) {
            if ($length % $this->block_size == 0) {
                return $text;
            } else {
                user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})");
                $this->padding = true;
            }
        }

        $pad = $this->block_size - ($length % $this->block_size);

        return str_pad($text, $length + $pad, chr($pad));
    }

    /**
     * Unpads a string.
     *
     * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
     * and false will be returned.
     *
     * @see self::_pad()
     * @param string $text
     * @access private
     * @return string
     */
    function _unpad($text)
    {
        if (!$this->padding) {
            return $text;
        }

        $length = ord($text[strlen($text) - 1]);

        if (!$length || $length > $this->block_size) {
            return false;
        }

        return substr($text, 0, -$length);
    }

    /**
     * Clears internal buffers
     *
     * Clearing/resetting the internal buffers is done everytime
     * after disableContinuousBuffer() or on cipher $engine (re)init
     * ie after setKey() or setIV()
     *
     * @access public
     * @internal Could, but not must, extend by the child Crypt_* class
     */
    function _clearBuffers()
    {
        $this->enbuffer = $this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);

        // mcrypt's handling of invalid's $iv:
        // $this->encryptIV = $this->decryptIV = strlen($this->iv) == $this->block_size ? $this->iv : str_repeat("\0", $this->block_size);
        $this->encryptIV = $this->decryptIV = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, "\0");

        if (!$this->skip_key_adjustment) {
            $this->key = str_pad(substr($this->key, 0, $this->key_length), $this->key_length, "\0");
        }
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @access private
     * @return string
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }

    /**
     * String Pop
     *
     * Inspired by array_pop
     *
     * @param string $string
     * @param int $index
     * @access private
     * @return string
     */
    function _string_pop(&$string, $index = 1)
    {
        $substr = substr($string, -$index);
        $string = substr($string, 0, -$index);
        return $substr;
    }

    /**
     * Increment the current string
     *
     * @see self::decrypt()
     * @see self::encrypt()
     * @param string $var
     * @access private
     */
    function _increment_str(&$var)
    {
        for ($i = 4; $i <= strlen($var); $i+= 4) {
            $temp = substr($var, -$i, 4);
            switch ($temp) {
                case "\xFF\xFF\xFF\xFF":
                    $var = substr_replace($var, "\x00\x00\x00\x00", -$i, 4);
                    break;
                case "\x7F\xFF\xFF\xFF":
                    $var = substr_replace($var, "\x80\x00\x00\x00", -$i, 4);
                    return;
                default:
                    $temp = unpack('Nnum', $temp);
                    $var = substr_replace($var, pack('N', $temp['num'] + 1), -$i, 4);
                    return;
            }
        }

        $remainder = strlen($var) % 4;

        if ($remainder == 0) {
            return;
        }

        $temp = unpack('Nnum', str_pad(substr($var, 0, $remainder), 4, "\0", STR_PAD_LEFT));
        $temp = substr(pack('N', $temp['num'] + 1), -$remainder);
        $var = substr_replace($var, $temp, 0, $remainder);
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * Stores the created (or existing) callback function-name
     * in $this->inline_crypt
     *
     * Internally for phpseclib developers:
     *
     *     _setupInlineCrypt() would be called only if:
     *
     *     - $engine == CRYPT_ENGINE_INTERNAL and
     *
     *     - $use_inline_crypt === true
     *
     *     - each time on _setup(), after(!) _setupKey()
     *
     *
     *     This ensures that _setupInlineCrypt() has always a
     *     full ready2go initializated internal cipher $engine state
     *     where, for example, the keys allready expanded,
     *     keys/block_size calculated and such.
     *
     *     It is, each time if called, the responsibility of _setupInlineCrypt():
     *
     *     - to set $this->inline_crypt to a valid and fully working callback function
     *       as a (faster) replacement for encrypt() / decrypt()
     *
     *     - NOT to create unlimited callback functions (for memory reasons!)
     *       no matter how often _setupInlineCrypt() would be called. At some
     *       point of amount they must be generic re-useable.
     *
     *     - the code of _setupInlineCrypt() it self,
     *       and the generated callback code,
     *       must be, in following order:
     *       - 100% safe
     *       - 100% compatible to encrypt()/decrypt()
     *       - using only php5+ features/lang-constructs/php-extensions if
     *         compatibility (down to php4) or fallback is provided
     *       - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-)
     *       - >= 10% faster than encrypt()/decrypt() [which is, by the way,
     *         the reason for the existence of _setupInlineCrypt() :-)]
     *       - memory-nice
     *       - short (as good as possible)
     *
     * Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
     *       - In case of using inline crypting, _setupInlineCrypt() must extend by the child Crypt_* class.
     *       - The following variable names are reserved:
     *         - $_*  (all variable names prefixed with an underscore)
     *         - $self (object reference to it self. Do not use $this, but $self instead)
     *         - $in (the content of $in has to en/decrypt by the generated code)
     *       - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
     *
     *
     * @see self::_setup()
     * @see self::_createInlineCryptFunction()
     * @see self::encrypt()
     * @see self::decrypt()
     * @access private
     * @internal If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
     */
    function _setupInlineCrypt()
    {
        // If, for any reason, an extending Crypt_Base() Crypt_* class
        // not using inline crypting then it must be ensured that: $this->use_inline_crypt = false
        // ie in the class var declaration of $use_inline_crypt in general for the Crypt_* class,
        // in the constructor at object instance-time
        // or, if it's runtime-specific, at runtime

        $this->use_inline_crypt = false;
    }

    /**
     * Creates the performance-optimized function for en/decrypt()
     *
     * Internally for phpseclib developers:
     *
     *    _createInlineCryptFunction():
     *
     *    - merge the $cipher_code [setup'ed by _setupInlineCrypt()]
     *      with the current [$this->]mode of operation code
     *
     *    - create the $inline function, which called by encrypt() / decrypt()
     *      as its replacement to speed up the en/decryption operations.
     *
     *    - return the name of the created $inline callback function
     *
     *    - used to speed up en/decryption
     *
     *
     *
     *    The main reason why can speed up things [up to 50%] this way are:
     *
     *    - using variables more effective then regular.
     *      (ie no use of expensive arrays but integers $k_0, $k_1 ...
     *      or even, for example, the pure $key[] values hardcoded)
     *
     *    - avoiding 1000's of function calls of ie _encryptBlock()
     *      but inlining the crypt operations.
     *      in the mode of operation for() loop.
     *
     *    - full loop unroll the (sometimes key-dependent) rounds
     *      avoiding this way ++$i counters and runtime-if's etc...
     *
     *    The basic code architectur of the generated $inline en/decrypt()
     *    lambda function, in pseudo php, is:
     *
     *    
     *    +----------------------------------------------------------------------------------------------+
     *    | callback $inline = create_function:                                                          |
     *    | lambda_function_0001_crypt_ECB($action, $text)                                               |
     *    | {                                                                                            |
     *    |     INSERT PHP CODE OF:                                                                      |
     *    |     $cipher_code['init_crypt'];                  // general init code.                       |
     *    |                                                  // ie: $sbox'es declarations used for       |
     *    |                                                  //     encrypt and decrypt'ing.             |
     *    |                                                                                              |
     *    |     switch ($action) {                                                                       |
     *    |         case 'encrypt':                                                                      |
     *    |             INSERT PHP CODE OF:                                                              |
     *    |             $cipher_code['init_encrypt'];       // encrypt sepcific init code.               |
     *    |                                                    ie: specified $key or $box                |
     *    |                                                        declarations for encrypt'ing.         |
     *    |                                                                                              |
     *    |             foreach ($ciphertext) {                                                          |
     *    |                 $in = $block_size of $ciphertext;                                            |
     *    |                                                                                              |
     *    |                 INSERT PHP CODE OF:                                                          |
     *    |                 $cipher_code['encrypt_block'];  // encrypt's (string) $in, which is always:  |
     *    |                                                 // strlen($in) == $this->block_size          |
     *    |                                                 // here comes the cipher algorithm in action |
     *    |                                                 // for encryption.                           |
     *    |                                                 // $cipher_code['encrypt_block'] has to      |
     *    |                                                 // encrypt the content of the $in variable   |
     *    |                                                                                              |
     *    |                 $plaintext .= $in;                                                           |
     *    |             }                                                                                |
     *    |             return $plaintext;                                                               |
     *    |                                                                                              |
     *    |         case 'decrypt':                                                                      |
     *    |             INSERT PHP CODE OF:                                                              |
     *    |             $cipher_code['init_decrypt'];       // decrypt sepcific init code                |
     *    |                                                    ie: specified $key or $box                |
     *    |                                                        declarations for decrypt'ing.         |
     *    |             foreach ($plaintext) {                                                           |
     *    |                 $in = $block_size of $plaintext;                                             |
     *    |                                                                                              |
     *    |                 INSERT PHP CODE OF:                                                          |
     *    |                 $cipher_code['decrypt_block'];  // decrypt's (string) $in, which is always   |
     *    |                                                 // strlen($in) == $this->block_size          |
     *    |                                                 // here comes the cipher algorithm in action |
     *    |                                                 // for decryption.                           |
     *    |                                                 // $cipher_code['decrypt_block'] has to      |
     *    |                                                 // decrypt the content of the $in variable   |
     *    |                 $ciphertext .= $in;                                                          |
     *    |             }                                                                                |
     *    |             return $ciphertext;                                                              |
     *    |     }                                                                                        |
     *    | }                                                                                            |
     *    +----------------------------------------------------------------------------------------------+
     *    
     *
     *    See also the Crypt_*::_setupInlineCrypt()'s for
     *    productive inline $cipher_code's how they works.
     *
     *    Structure of:
     *    
     *    $cipher_code = array(
     *        'init_crypt'    => (string) '', // optional
     *        'init_encrypt'  => (string) '', // optional
     *        'init_decrypt'  => (string) '', // optional
     *        'encrypt_block' => (string) '', // required
     *        'decrypt_block' => (string) ''  // required
     *    );
     *    
     *
     * @see self::_setupInlineCrypt()
     * @see self::encrypt()
     * @see self::decrypt()
     * @param array $cipher_code
     * @access private
     * @return string (the name of the created callback function)
     */
    function _createInlineCryptFunction($cipher_code)
    {
        $block_size = $this->block_size;

        // optional
        $init_crypt    = isset($cipher_code['init_crypt'])    ? $cipher_code['init_crypt']    : '';
        $init_encrypt  = isset($cipher_code['init_encrypt'])  ? $cipher_code['init_encrypt']  : '';
        $init_decrypt  = isset($cipher_code['init_decrypt'])  ? $cipher_code['init_decrypt']  : '';
        // required
        $encrypt_block = $cipher_code['encrypt_block'];
        $decrypt_block = $cipher_code['decrypt_block'];

        // Generating mode of operation inline code,
        // merged with the $cipher_code algorithm
        // for encrypt- and decryption.
        switch ($this->mode) {
            case CRYPT_MODE_ECB:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    $_plaintext_len = strlen($_text);

                    for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                        $in = substr($_text, $_i, '.$block_size.');
                        '.$encrypt_block.'
                        $_ciphertext.= $in;
                    }

                    return $_ciphertext;
                    ';

                $decrypt = $init_decrypt . '
                    $_plaintext = "";
                    $_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
                    $_ciphertext_len = strlen($_text);

                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                        $in = substr($_text, $_i, '.$block_size.');
                        '.$decrypt_block.'
                        $_plaintext.= $in;
                    }

                    return $self->_unpad($_plaintext);
                    ';
                break;
            case CRYPT_MODE_CTR:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    $_plaintext_len = strlen($_text);
                    $_xor = $self->encryptIV;
                    $_buffer = &$self->enbuffer;
                    if (strlen($_buffer["ciphertext"])) {
                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
                                $in = $_xor;
                                '.$encrypt_block.'
                                $self->_increment_str($_xor);
                                $_buffer["ciphertext"].= $in;
                            }
                            $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
                            $_ciphertext.= $_block ^ $_key;
                        }
                    } else {
                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            $in = $_xor;
                            '.$encrypt_block.'
                            $self->_increment_str($_xor);
                            $_key = $in;
                            $_ciphertext.= $_block ^ $_key;
                        }
                    }
                    if ($self->continuousBuffer) {
                        $self->encryptIV = $_xor;
                        if ($_start = $_plaintext_len % '.$block_size.') {
                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
                        }
                    }

                    return $_ciphertext;
                ';

                $decrypt = $init_encrypt . '
                    $_plaintext = "";
                    $_ciphertext_len = strlen($_text);
                    $_xor = $self->decryptIV;
                    $_buffer = &$self->debuffer;

                    if (strlen($_buffer["ciphertext"])) {
                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
                                $in = $_xor;
                                '.$encrypt_block.'
                                $self->_increment_str($_xor);
                                $_buffer["ciphertext"].= $in;
                            }
                            $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
                            $_plaintext.= $_block ^ $_key;
                        }
                    } else {
                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            $in = $_xor;
                            '.$encrypt_block.'
                            $self->_increment_str($_xor);
                            $_key = $in;
                            $_plaintext.= $_block ^ $_key;
                        }
                    }
                    if ($self->continuousBuffer) {
                        $self->decryptIV = $_xor;
                        if ($_start = $_ciphertext_len % '.$block_size.') {
                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
                        }
                    }

                    return $_plaintext;
                    ';
                break;
            case CRYPT_MODE_CFB:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    $_buffer = &$self->enbuffer;

                    if ($self->continuousBuffer) {
                        $_iv = &$self->encryptIV;
                        $_pos = &$_buffer["pos"];
                    } else {
                        $_iv = $self->encryptIV;
                        $_pos = 0;
                    }
                    $_len = strlen($_text);
                    $_i = 0;
                    if ($_pos) {
                        $_orig_pos = $_pos;
                        $_max = '.$block_size.' - $_pos;
                        if ($_len >= $_max) {
                            $_i = $_max;
                            $_len-= $_max;
                            $_pos = 0;
                        } else {
                            $_i = $_len;
                            $_pos+= $_len;
                            $_len = 0;
                        }
                        $_ciphertext = substr($_iv, $_orig_pos) ^ $_text;
                        $_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i);
                    }
                    while ($_len >= '.$block_size.') {
                        $in = $_iv;
                        '.$encrypt_block.';
                        $_iv = $in ^ substr($_text, $_i, '.$block_size.');
                        $_ciphertext.= $_iv;
                        $_len-= '.$block_size.';
                        $_i+= '.$block_size.';
                    }
                    if ($_len) {
                        $in = $_iv;
                        '.$encrypt_block.'
                        $_iv = $in;
                        $_block = $_iv ^ substr($_text, $_i);
                        $_iv = substr_replace($_iv, $_block, 0, $_len);
                        $_ciphertext.= $_block;
                        $_pos = $_len;
                    }
                    return $_ciphertext;
                ';

                $decrypt = $init_encrypt . '
                    $_plaintext = "";
                    $_buffer = &$self->debuffer;

                    if ($self->continuousBuffer) {
                        $_iv = &$self->decryptIV;
                        $_pos = &$_buffer["pos"];
                    } else {
                        $_iv = $self->decryptIV;
                        $_pos = 0;
                    }
                    $_len = strlen($_text);
                    $_i = 0;
                    if ($_pos) {
                        $_orig_pos = $_pos;
                        $_max = '.$block_size.' - $_pos;
                        if ($_len >= $_max) {
                            $_i = $_max;
                            $_len-= $_max;
                            $_pos = 0;
                        } else {
                            $_i = $_len;
                            $_pos+= $_len;
                            $_len = 0;
                        }
                        $_plaintext = substr($_iv, $_orig_pos) ^ $_text;
                        $_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i);
                    }
                    while ($_len >= '.$block_size.') {
                        $in = $_iv;
                        '.$encrypt_block.'
                        $_iv = $in;
                        $cb = substr($_text, $_i, '.$block_size.');
                        $_plaintext.= $_iv ^ $cb;
                        $_iv = $cb;
                        $_len-= '.$block_size.';
                        $_i+= '.$block_size.';
                    }
                    if ($_len) {
                        $in = $_iv;
                        '.$encrypt_block.'
                        $_iv = $in;
                        $_plaintext.= $_iv ^ substr($_text, $_i);
                        $_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len);
                        $_pos = $_len;
                    }

                    return $_plaintext;
                    ';
                break;
            case CRYPT_MODE_OFB:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    $_plaintext_len = strlen($_text);
                    $_xor = $self->encryptIV;
                    $_buffer = &$self->enbuffer;

                    if (strlen($_buffer["xor"])) {
                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            if (strlen($_block) > strlen($_buffer["xor"])) {
                                $in = $_xor;
                                '.$encrypt_block.'
                                $_xor = $in;
                                $_buffer["xor"].= $_xor;
                            }
                            $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
                            $_ciphertext.= $_block ^ $_key;
                        }
                    } else {
                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                            $in = $_xor;
                            '.$encrypt_block.'
                            $_xor = $in;
                            $_ciphertext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
                        }
                        $_key = $_xor;
                    }
                    if ($self->continuousBuffer) {
                        $self->encryptIV = $_xor;
                        if ($_start = $_plaintext_len % '.$block_size.') {
                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
                        }
                    }
                    return $_ciphertext;
                    ';

                $decrypt = $init_encrypt . '
                    $_plaintext = "";
                    $_ciphertext_len = strlen($_text);
                    $_xor = $self->decryptIV;
                    $_buffer = &$self->debuffer;

                    if (strlen($_buffer["xor"])) {
                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                            $_block = substr($_text, $_i, '.$block_size.');
                            if (strlen($_block) > strlen($_buffer["xor"])) {
                                $in = $_xor;
                                '.$encrypt_block.'
                                $_xor = $in;
                                $_buffer["xor"].= $_xor;
                            }
                            $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
                            $_plaintext.= $_block ^ $_key;
                        }
                    } else {
                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                            $in = $_xor;
                            '.$encrypt_block.'
                            $_xor = $in;
                            $_plaintext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
                        }
                        $_key = $_xor;
                    }
                    if ($self->continuousBuffer) {
                        $self->decryptIV = $_xor;
                        if ($_start = $_ciphertext_len % '.$block_size.') {
                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
                        }
                    }
                    return $_plaintext;
                    ';
                break;
            case CRYPT_MODE_STREAM:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    '.$encrypt_block.'
                    return $_ciphertext;
                    ';
                $decrypt = $init_decrypt . '
                    $_plaintext = "";
                    '.$decrypt_block.'
                    return $_plaintext;
                    ';
                break;
            // case CRYPT_MODE_CBC:
            default:
                $encrypt = $init_encrypt . '
                    $_ciphertext = "";
                    $_plaintext_len = strlen($_text);

                    $in = $self->encryptIV;

                    for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
                        $in = substr($_text, $_i, '.$block_size.') ^ $in;
                        '.$encrypt_block.'
                        $_ciphertext.= $in;
                    }

                    if ($self->continuousBuffer) {
                        $self->encryptIV = $in;
                    }

                    return $_ciphertext;
                    ';

                $decrypt = $init_decrypt . '
                    $_plaintext = "";
                    $_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
                    $_ciphertext_len = strlen($_text);

                    $_iv = $self->decryptIV;

                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
                        $in = $_block = substr($_text, $_i, '.$block_size.');
                        '.$decrypt_block.'
                        $_plaintext.= $in ^ $_iv;
                        $_iv = $_block;
                    }

                    if ($self->continuousBuffer) {
                        $self->decryptIV = $_iv;
                    }

                    return $self->_unpad($_plaintext);
                    ';
                break;
        }

        // Create the $inline function and return its name as string. Ready to run!
        if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
            eval('$func = function ($_action, &$self, $_text) { ' . $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' } };');
            return $func;
        }

        return create_function('$_action, &$self, $_text', $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }');
    }

    /**
     * Holds the lambda_functions table (classwide)
     *
     * Each name of the lambda function, created from
     * _setupInlineCrypt() && _createInlineCryptFunction()
     * is stored, classwide (!), here for reusing.
     *
     * The string-based index of $function is a classwide
     * unique value representing, at least, the $mode of
     * operation (or more... depends of the optimizing level)
     * for which $mode the lambda function was created.
     *
     * @access private
     * @return array &$functions
     */
    function &_getLambdaFunctions()
    {
        static $functions = array();
        return $functions;
    }

    /**
     * Generates a digest from $bytes
     *
     * @see self::_setupInlineCrypt()
     * @access private
     * @param $bytes
     * @return string
     */
    function _hashInlineCryptFunction($bytes)
    {
        if (!defined('CRYPT_BASE_WHIRLPOOL_AVAILABLE')) {
            define('CRYPT_BASE_WHIRLPOOL_AVAILABLE', (bool)(extension_loaded('hash') && in_array('whirlpool', hash_algos())));
        }

        $result = '';
        $hash = $bytes;

        switch (true) {
            case CRYPT_BASE_WHIRLPOOL_AVAILABLE:
                foreach (str_split($bytes, 64) as $t) {
                    $hash = hash('whirlpool', $hash, true);
                    $result .= $t ^ $hash;
                }
                return $result . hash('whirlpool', $hash, true);
            default:
                $len = strlen($bytes);
                for ($i = 0; $i < $len; $i+=20) {
                    $t = substr($bytes, $i, 20);
                    $hash = pack('H*', sha1($hash));
                    $result .= $t ^ $hash;
                }
                return $result . pack('H*', sha1($hash));
        }
    }

    /**
     * Convert float to int
     *
     * On 32-bit Linux installs running PHP < 5.3 converting floats to ints doesn't always work
     *
     * @access private
     * @param string $x
     * @return int
     */
    function safe_intval($x)
    {
        switch (true) {
            case is_int($x):
            // PHP 5.3, per http://php.net/releases/5_3_0.php, introduced "more consistent float rounding"
            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
            // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
                return $x;
        }
        return (fmod($x, 0x80000000) & 0x7FFFFFFF) |
            ((fmod(floor($x / 0x80000000), 2) & 1) << 31);
    }

    /**
     * eval()'able string for in-line float to int
     *
     * @access private
     * @return string
     */
    function safe_intval_inline()
    {
        // on 32-bit linux systems with PHP < 5.3 float to integer conversion is bad
        switch (true) {
            case defined('PHP_INT_SIZE') && PHP_INT_SIZE == 8:
            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
                return '%s';
                break;
            default:
                $safeint = '(is_int($temp = %s) ? $temp : (fmod($temp, 0x80000000) & 0x7FFFFFFF) | ';
                return $safeint . '((fmod(floor($temp / 0x80000000), 2) & 1) << 31))';
        }
    }
}
phpseclib-1.0.18/phpseclib/Crypt/Blowfish.php000066400000000000000000000707331354156543400211360ustar00rootroot00000000000000
 * setKey('12345678901234567890123456789012');
 *
 *    $plaintext = str_repeat('a', 1024);
 *
 *    echo $blowfish->decrypt($blowfish->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_Blowfish
 * @author    Jim Wigginton 
 * @author    Hans-Juergen Petrich 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_BLOWFISH_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_BLOWFISH_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_BLOWFISH_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_BLOWFISH_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_BLOWFISH_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of Blowfish.
 *
 * @package Crypt_Blowfish
 * @author  Jim Wigginton 
 * @author  Hans-Juergen Petrich 
 * @access  public
 */
class Crypt_Blowfish extends Crypt_Base
{
    /**
     * Block Length of the cipher
     *
     * @see Crypt_Base::block_size
     * @var int
     * @access private
     */
    var $block_size = 8;

    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'BLOWFISH';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'blowfish';

    /**
     * Optimizing value while CFB-encrypting
     *
     * @see Crypt_Base::cfb_init_len
     * @var int
     * @access private
     */
    var $cfb_init_len = 500;

    /**
     * The fixed subkeys boxes ($sbox0 - $sbox3) with 256 entries each
     *
     * S-Box 0
     *
     * @access private
     * @var    array
     */
    var $sbox0 = array(
        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
        0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
        0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
        0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
        0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
        0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
        0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
        0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
        0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
        0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
        0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
        0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
        0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
        0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
        0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
        0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
        0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
        0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
        0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
        0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
        0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
        0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a
    );

    /**
     * S-Box 1
     *
     * @access private
     * @var    array
     */
    var $sbox1 = array(
        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
        0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
        0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
        0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
        0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
        0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
        0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
        0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
        0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
        0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
        0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
        0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
        0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
        0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
        0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
        0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
        0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
        0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
        0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
        0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
        0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
        0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7
    );

    /**
     * S-Box 2
     *
     * @access private
     * @var    array
     */
    var $sbox2 = array(
        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
        0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
        0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
        0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
        0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
        0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
        0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
        0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
        0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
        0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
        0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
        0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
        0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
        0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
        0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
        0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
        0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
        0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
        0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
        0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
        0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
        0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0
    );

    /**
     * S-Box 3
     *
     * @access private
     * @var    array
     */
    var $sbox3 = array(
        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
        0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
        0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
        0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
        0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
        0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
        0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
        0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
        0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
        0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
        0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
        0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
        0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
        0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
        0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
        0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
        0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
        0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
        0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
        0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
        0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
        0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6
    );

    /**
     * P-Array consists of 18 32-bit subkeys
     *
     * @var array
     * @access private
     */
    var $parray = array(
        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
        0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b
    );

    /**
     * The BCTX-working Array
     *
     * Holds the expanded key [p] and the key-depended s-boxes [sb]
     *
     * @var array
     * @access private
     */
    var $bctx;

    /**
     * Holds the last used key
     *
     * @var array
     * @access private
     */
    var $kl;

    /**
     * The Key Length (in bytes)
     *
     * @see Crypt_Base::setKeyLength()
     * @var int
     * @access private
     * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
     *    of that, we'll just precompute it once.
     */
    var $key_length = 16;

    /**
     * Sets the key length.
     *
     * Key lengths can be between 32 and 448 bits.
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        if ($length < 32) {
            $this->key_length = 4;
        } elseif ($length > 448) {
            $this->key_length = 56;
        } else {
            $this->key_length = $length >> 3;
        }

        parent::setKeyLength($length);
    }

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::isValidEngine()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        if ($engine == CRYPT_ENGINE_OPENSSL) {
            if (version_compare(PHP_VERSION, '5.3.7') < 0 && $this->key_length != 16) {
                return false;
            }
            if ($this->key_length < 16) {
                return false;
            }
            $this->cipher_name_openssl_ecb = 'bf-ecb';
            $this->cipher_name_openssl = 'bf-' . $this->_openssl_translate_mode();
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Setup the key (expansion)
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
            // already expanded
            return;
        }
        $this->kl = array('key' => $this->key);

        /* key-expanding p[] and S-Box building sb[] */
        $this->bctx = array(
            'p'  => array(),
            'sb' => array(
                $this->sbox0,
                $this->sbox1,
                $this->sbox2,
                $this->sbox3
            )
        );

        // unpack binary string in unsigned chars
        $key  = array_values(unpack('C*', $this->key));
        $keyl = count($key);
        for ($j = 0, $i = 0; $i < 18; ++$i) {
            // xor P1 with the first 32-bits of the key, xor P2 with the second 32-bits ...
            for ($data = 0, $k = 0; $k < 4; ++$k) {
                $data = ($data << 8) | $key[$j];
                if (++$j >= $keyl) {
                    $j = 0;
                }
            }
            $this->bctx['p'][] = $this->parray[$i] ^ $data;
        }

        // encrypt the zero-string, replace P1 and P2 with the encrypted data,
        // encrypt P3 and P4 with the new P1 and P2, do it with all P-array and subkeys
        $data = "\0\0\0\0\0\0\0\0";
        for ($i = 0; $i < 18; $i += 2) {
            list($l, $r) = array_values(unpack('N*', $data = $this->_encryptBlock($data)));
            $this->bctx['p'][$i    ] = $l;
            $this->bctx['p'][$i + 1] = $r;
        }
        for ($i = 0; $i < 4; ++$i) {
            for ($j = 0; $j < 256; $j += 2) {
                list($l, $r) = array_values(unpack('N*', $data = $this->_encryptBlock($data)));
                $this->bctx['sb'][$i][$j    ] = $l;
                $this->bctx['sb'][$i][$j + 1] = $r;
            }
        }
    }

    /**
     * Encrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _encryptBlock($in)
    {
        $p = $this->bctx["p"];
        // extract($this->bctx["sb"], EXTR_PREFIX_ALL, "sb"); // slower
        $sb_0 = $this->bctx["sb"][0];
        $sb_1 = $this->bctx["sb"][1];
        $sb_2 = $this->bctx["sb"][2];
        $sb_3 = $this->bctx["sb"][3];

        $in = unpack("N*", $in);
        $l = $in[1];
        $r = $in[2];

        for ($i = 0; $i < 16; $i+= 2) {
            $l^= $p[$i];
            $r^= $this->safe_intval(($this->safe_intval($sb_0[$l >> 24 & 0xff]  + $sb_1[$l >> 16 & 0xff]) ^
                  $sb_2[$l >>  8 & 0xff]) +
                  $sb_3[$l       & 0xff]);

            $r^= $p[$i + 1];
            $l^= $this->safe_intval(($this->safe_intval($sb_0[$r >> 24 & 0xff]  + $sb_1[$r >> 16 & 0xff]) ^
                  $sb_2[$r >>  8 & 0xff]) +
                  $sb_3[$r       & 0xff]);
        }
        return pack("N*", $r ^ $p[17], $l ^ $p[16]);
    }

    /**
     * Decrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _decryptBlock($in)
    {
        $p = $this->bctx["p"];
        $sb_0 = $this->bctx["sb"][0];
        $sb_1 = $this->bctx["sb"][1];
        $sb_2 = $this->bctx["sb"][2];
        $sb_3 = $this->bctx["sb"][3];

        $in = unpack("N*", $in);
        $l = $in[1];
        $r = $in[2];

        for ($i = 17; $i > 2; $i-= 2) {
            $l^= $p[$i];
            $r^= $this->safe_intval(($this->safe_intval($sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]) ^
                  $sb_2[$l >>  8 & 0xff]) +
                  $sb_3[$l       & 0xff]);

            $r^= $p[$i - 1];
            $l^= $this->safe_intval(($this->safe_intval($sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]) ^
                  $sb_2[$r >>  8 & 0xff]) +
                  $sb_3[$r       & 0xff]);
        }
        return pack("N*", $r ^ $p[0], $l ^ $p[1]);
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * @see Crypt_Base::_setupInlineCrypt()
     * @access private
     */
    function _setupInlineCrypt()
    {
        $lambda_functions =& Crypt_Blowfish::_getLambdaFunctions();

        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
        // (Currently, for Crypt_Blowfish, one generated $lambda_function cost on php5.5@32bit ~100kb unfreeable mem and ~180kb on php5.5@64bit)
        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one.
        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);

        // Generation of a unique hash for our generated code
        $code_hash = "Crypt_Blowfish, {$this->mode}";
        if ($gen_hi_opt_code) {
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }

        $safeint = $this->safe_intval_inline();

        if (!isset($lambda_functions[$code_hash])) {
            switch (true) {
                case $gen_hi_opt_code:
                    $p = $this->bctx['p'];
                    $init_crypt = '
                        static $sb_0, $sb_1, $sb_2, $sb_3;
                        if (!$sb_0) {
                            $sb_0 = $self->bctx["sb"][0];
                            $sb_1 = $self->bctx["sb"][1];
                            $sb_2 = $self->bctx["sb"][2];
                            $sb_3 = $self->bctx["sb"][3];
                        }
                    ';
                    break;
                default:
                    $p   = array();
                    for ($i = 0; $i < 18; ++$i) {
                        $p[] = '$p_' . $i;
                    }
                    $init_crypt = '
                        list($sb_0, $sb_1, $sb_2, $sb_3) = $self->bctx["sb"];
                        list(' . implode(',', $p) . ') = $self->bctx["p"];

                    ';
            }

            // Generating encrypt code:
            $encrypt_block = '
                $in = unpack("N*", $in);
                $l = $in[1];
                $r = $in[2];
            ';
            for ($i = 0; $i < 16; $i+= 2) {
                $encrypt_block.= '
                    $l^= ' . $p[$i] . ';
                    $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]') . ' ^
                          $sb_2[$l >>  8 & 0xff]) +
                          $sb_3[$l       & 0xff]') . ';

                    $r^= ' . $p[$i + 1] . ';
                    $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]') . '  ^
                          $sb_2[$r >>  8 & 0xff]) +
                          $sb_3[$r       & 0xff]') . ';
                ';
            }
            $encrypt_block.= '
                $in = pack("N*",
                    $r ^ ' . $p[17] . ',
                    $l ^ ' . $p[16] . '
                );
            ';

            // Generating decrypt code:
            $decrypt_block = '
                $in = unpack("N*", $in);
                $l = $in[1];
                $r = $in[2];
            ';

            for ($i = 17; $i > 2; $i-= 2) {
                $decrypt_block.= '
                    $l^= ' . $p[$i] . ';
                    $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]') . ' ^
                          $sb_2[$l >>  8 & 0xff]) +
                          $sb_3[$l       & 0xff]') . ';

                    $r^= ' . $p[$i - 1] . ';
                    $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]') . ' ^
                          $sb_2[$r >>  8 & 0xff]) +
                          $sb_3[$r       & 0xff]') . ';
                ';
            }

            $decrypt_block.= '
                $in = pack("N*",
                    $r ^ ' . $p[0] . ',
                    $l ^ ' . $p[1] . '
                );
            ';

            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => $init_crypt,
                   'init_encrypt'  => '',
                   'init_decrypt'  => '',
                   'encrypt_block' => $encrypt_block,
                   'decrypt_block' => $decrypt_block
                )
            );
        }
        $this->inline_crypt = $lambda_functions[$code_hash];
    }
}
phpseclib-1.0.18/phpseclib/Crypt/DES.php000066400000000000000000002204721354156543400177710ustar00rootroot00000000000000
 * setKey('abcdefgh');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $des->decrypt($des->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_DES
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access private
 * @see self::_setupKey()
 * @see self::_processBlock()
 */
/**
 * Contains $keys[CRYPT_DES_ENCRYPT]
 */
define('CRYPT_DES_ENCRYPT', 0);
/**
 * Contains $keys[CRYPT_DES_DECRYPT]
 */
define('CRYPT_DES_DECRYPT', 1);
/**#@-*/

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_DES_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_DES_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_DES_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_DES_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_DES_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of DES.
 *
 * @package Crypt_DES
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_DES extends Crypt_Base
{
    /**
     * Block Length of the cipher
     *
     * @see Crypt_Base::block_size
     * @var int
     * @access private
     */
    var $block_size = 8;

    /**
     * Key Length (in bytes)
     *
     * @see Crypt_Base::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 8;

    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'DES';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'des';

    /**
     * The OpenSSL names of the cipher / modes
     *
     * @see Crypt_Base::openssl_mode_names
     * @var array
     * @access private
     */
    var $openssl_mode_names = array(
        CRYPT_MODE_ECB => 'des-ecb',
        CRYPT_MODE_CBC => 'des-cbc',
        CRYPT_MODE_CFB => 'des-cfb',
        CRYPT_MODE_OFB => 'des-ofb'
        // CRYPT_MODE_CTR is undefined for DES
    );

    /**
     * Optimizing value while CFB-encrypting
     *
     * @see Crypt_Base::cfb_init_len
     * @var int
     * @access private
     */
    var $cfb_init_len = 500;

    /**
     * Switch for DES/3DES encryption
     *
     * Used only if $engine == CRYPT_DES_MODE_INTERNAL
     *
     * @see self::_setupKey()
     * @see self::_processBlock()
     * @var int
     * @access private
     */
    var $des_rounds = 1;

    /**
     * max possible size of $key
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key_length_max = 8;

    /**
     * The Key Schedule
     *
     * @see self::_setupKey()
     * @var array
     * @access private
     */
    var $keys;

    /**
     * Shuffle table.
     *
     * For each byte value index, the entry holds an 8-byte string
     * with each byte containing all bits in the same state as the
     * corresponding bit in the index value.
     *
     * @see self::_processBlock()
     * @see self::_setupKey()
     * @var array
     * @access private
     */
    var $shuffle = array(
        "\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\xFF",
        "\x00\x00\x00\x00\x00\x00\xFF\x00", "\x00\x00\x00\x00\x00\x00\xFF\xFF",
        "\x00\x00\x00\x00\x00\xFF\x00\x00", "\x00\x00\x00\x00\x00\xFF\x00\xFF",
        "\x00\x00\x00\x00\x00\xFF\xFF\x00", "\x00\x00\x00\x00\x00\xFF\xFF\xFF",
        "\x00\x00\x00\x00\xFF\x00\x00\x00", "\x00\x00\x00\x00\xFF\x00\x00\xFF",
        "\x00\x00\x00\x00\xFF\x00\xFF\x00", "\x00\x00\x00\x00\xFF\x00\xFF\xFF",
        "\x00\x00\x00\x00\xFF\xFF\x00\x00", "\x00\x00\x00\x00\xFF\xFF\x00\xFF",
        "\x00\x00\x00\x00\xFF\xFF\xFF\x00", "\x00\x00\x00\x00\xFF\xFF\xFF\xFF",
        "\x00\x00\x00\xFF\x00\x00\x00\x00", "\x00\x00\x00\xFF\x00\x00\x00\xFF",
        "\x00\x00\x00\xFF\x00\x00\xFF\x00", "\x00\x00\x00\xFF\x00\x00\xFF\xFF",
        "\x00\x00\x00\xFF\x00\xFF\x00\x00", "\x00\x00\x00\xFF\x00\xFF\x00\xFF",
        "\x00\x00\x00\xFF\x00\xFF\xFF\x00", "\x00\x00\x00\xFF\x00\xFF\xFF\xFF",
        "\x00\x00\x00\xFF\xFF\x00\x00\x00", "\x00\x00\x00\xFF\xFF\x00\x00\xFF",
        "\x00\x00\x00\xFF\xFF\x00\xFF\x00", "\x00\x00\x00\xFF\xFF\x00\xFF\xFF",
        "\x00\x00\x00\xFF\xFF\xFF\x00\x00", "\x00\x00\x00\xFF\xFF\xFF\x00\xFF",
        "\x00\x00\x00\xFF\xFF\xFF\xFF\x00", "\x00\x00\x00\xFF\xFF\xFF\xFF\xFF",
        "\x00\x00\xFF\x00\x00\x00\x00\x00", "\x00\x00\xFF\x00\x00\x00\x00\xFF",
        "\x00\x00\xFF\x00\x00\x00\xFF\x00", "\x00\x00\xFF\x00\x00\x00\xFF\xFF",
        "\x00\x00\xFF\x00\x00\xFF\x00\x00", "\x00\x00\xFF\x00\x00\xFF\x00\xFF",
        "\x00\x00\xFF\x00\x00\xFF\xFF\x00", "\x00\x00\xFF\x00\x00\xFF\xFF\xFF",
        "\x00\x00\xFF\x00\xFF\x00\x00\x00", "\x00\x00\xFF\x00\xFF\x00\x00\xFF",
        "\x00\x00\xFF\x00\xFF\x00\xFF\x00", "\x00\x00\xFF\x00\xFF\x00\xFF\xFF",
        "\x00\x00\xFF\x00\xFF\xFF\x00\x00", "\x00\x00\xFF\x00\xFF\xFF\x00\xFF",
        "\x00\x00\xFF\x00\xFF\xFF\xFF\x00", "\x00\x00\xFF\x00\xFF\xFF\xFF\xFF",
        "\x00\x00\xFF\xFF\x00\x00\x00\x00", "\x00\x00\xFF\xFF\x00\x00\x00\xFF",
        "\x00\x00\xFF\xFF\x00\x00\xFF\x00", "\x00\x00\xFF\xFF\x00\x00\xFF\xFF",
        "\x00\x00\xFF\xFF\x00\xFF\x00\x00", "\x00\x00\xFF\xFF\x00\xFF\x00\xFF",
        "\x00\x00\xFF\xFF\x00\xFF\xFF\x00", "\x00\x00\xFF\xFF\x00\xFF\xFF\xFF",
        "\x00\x00\xFF\xFF\xFF\x00\x00\x00", "\x00\x00\xFF\xFF\xFF\x00\x00\xFF",
        "\x00\x00\xFF\xFF\xFF\x00\xFF\x00", "\x00\x00\xFF\xFF\xFF\x00\xFF\xFF",
        "\x00\x00\xFF\xFF\xFF\xFF\x00\x00", "\x00\x00\xFF\xFF\xFF\xFF\x00\xFF",
        "\x00\x00\xFF\xFF\xFF\xFF\xFF\x00", "\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF",
        "\x00\xFF\x00\x00\x00\x00\x00\x00", "\x00\xFF\x00\x00\x00\x00\x00\xFF",
        "\x00\xFF\x00\x00\x00\x00\xFF\x00", "\x00\xFF\x00\x00\x00\x00\xFF\xFF",
        "\x00\xFF\x00\x00\x00\xFF\x00\x00", "\x00\xFF\x00\x00\x00\xFF\x00\xFF",
        "\x00\xFF\x00\x00\x00\xFF\xFF\x00", "\x00\xFF\x00\x00\x00\xFF\xFF\xFF",
        "\x00\xFF\x00\x00\xFF\x00\x00\x00", "\x00\xFF\x00\x00\xFF\x00\x00\xFF",
        "\x00\xFF\x00\x00\xFF\x00\xFF\x00", "\x00\xFF\x00\x00\xFF\x00\xFF\xFF",
        "\x00\xFF\x00\x00\xFF\xFF\x00\x00", "\x00\xFF\x00\x00\xFF\xFF\x00\xFF",
        "\x00\xFF\x00\x00\xFF\xFF\xFF\x00", "\x00\xFF\x00\x00\xFF\xFF\xFF\xFF",
        "\x00\xFF\x00\xFF\x00\x00\x00\x00", "\x00\xFF\x00\xFF\x00\x00\x00\xFF",
        "\x00\xFF\x00\xFF\x00\x00\xFF\x00", "\x00\xFF\x00\xFF\x00\x00\xFF\xFF",
        "\x00\xFF\x00\xFF\x00\xFF\x00\x00", "\x00\xFF\x00\xFF\x00\xFF\x00\xFF",
        "\x00\xFF\x00\xFF\x00\xFF\xFF\x00", "\x00\xFF\x00\xFF\x00\xFF\xFF\xFF",
        "\x00\xFF\x00\xFF\xFF\x00\x00\x00", "\x00\xFF\x00\xFF\xFF\x00\x00\xFF",
        "\x00\xFF\x00\xFF\xFF\x00\xFF\x00", "\x00\xFF\x00\xFF\xFF\x00\xFF\xFF",
        "\x00\xFF\x00\xFF\xFF\xFF\x00\x00", "\x00\xFF\x00\xFF\xFF\xFF\x00\xFF",
        "\x00\xFF\x00\xFF\xFF\xFF\xFF\x00", "\x00\xFF\x00\xFF\xFF\xFF\xFF\xFF",
        "\x00\xFF\xFF\x00\x00\x00\x00\x00", "\x00\xFF\xFF\x00\x00\x00\x00\xFF",
        "\x00\xFF\xFF\x00\x00\x00\xFF\x00", "\x00\xFF\xFF\x00\x00\x00\xFF\xFF",
        "\x00\xFF\xFF\x00\x00\xFF\x00\x00", "\x00\xFF\xFF\x00\x00\xFF\x00\xFF",
        "\x00\xFF\xFF\x00\x00\xFF\xFF\x00", "\x00\xFF\xFF\x00\x00\xFF\xFF\xFF",
        "\x00\xFF\xFF\x00\xFF\x00\x00\x00", "\x00\xFF\xFF\x00\xFF\x00\x00\xFF",
        "\x00\xFF\xFF\x00\xFF\x00\xFF\x00", "\x00\xFF\xFF\x00\xFF\x00\xFF\xFF",
        "\x00\xFF\xFF\x00\xFF\xFF\x00\x00", "\x00\xFF\xFF\x00\xFF\xFF\x00\xFF",
        "\x00\xFF\xFF\x00\xFF\xFF\xFF\x00", "\x00\xFF\xFF\x00\xFF\xFF\xFF\xFF",
        "\x00\xFF\xFF\xFF\x00\x00\x00\x00", "\x00\xFF\xFF\xFF\x00\x00\x00\xFF",
        "\x00\xFF\xFF\xFF\x00\x00\xFF\x00", "\x00\xFF\xFF\xFF\x00\x00\xFF\xFF",
        "\x00\xFF\xFF\xFF\x00\xFF\x00\x00", "\x00\xFF\xFF\xFF\x00\xFF\x00\xFF",
        "\x00\xFF\xFF\xFF\x00\xFF\xFF\x00", "\x00\xFF\xFF\xFF\x00\xFF\xFF\xFF",
        "\x00\xFF\xFF\xFF\xFF\x00\x00\x00", "\x00\xFF\xFF\xFF\xFF\x00\x00\xFF",
        "\x00\xFF\xFF\xFF\xFF\x00\xFF\x00", "\x00\xFF\xFF\xFF\xFF\x00\xFF\xFF",
        "\x00\xFF\xFF\xFF\xFF\xFF\x00\x00", "\x00\xFF\xFF\xFF\xFF\xFF\x00\xFF",
        "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF",
        "\xFF\x00\x00\x00\x00\x00\x00\x00", "\xFF\x00\x00\x00\x00\x00\x00\xFF",
        "\xFF\x00\x00\x00\x00\x00\xFF\x00", "\xFF\x00\x00\x00\x00\x00\xFF\xFF",
        "\xFF\x00\x00\x00\x00\xFF\x00\x00", "\xFF\x00\x00\x00\x00\xFF\x00\xFF",
        "\xFF\x00\x00\x00\x00\xFF\xFF\x00", "\xFF\x00\x00\x00\x00\xFF\xFF\xFF",
        "\xFF\x00\x00\x00\xFF\x00\x00\x00", "\xFF\x00\x00\x00\xFF\x00\x00\xFF",
        "\xFF\x00\x00\x00\xFF\x00\xFF\x00", "\xFF\x00\x00\x00\xFF\x00\xFF\xFF",
        "\xFF\x00\x00\x00\xFF\xFF\x00\x00", "\xFF\x00\x00\x00\xFF\xFF\x00\xFF",
        "\xFF\x00\x00\x00\xFF\xFF\xFF\x00", "\xFF\x00\x00\x00\xFF\xFF\xFF\xFF",
        "\xFF\x00\x00\xFF\x00\x00\x00\x00", "\xFF\x00\x00\xFF\x00\x00\x00\xFF",
        "\xFF\x00\x00\xFF\x00\x00\xFF\x00", "\xFF\x00\x00\xFF\x00\x00\xFF\xFF",
        "\xFF\x00\x00\xFF\x00\xFF\x00\x00", "\xFF\x00\x00\xFF\x00\xFF\x00\xFF",
        "\xFF\x00\x00\xFF\x00\xFF\xFF\x00", "\xFF\x00\x00\xFF\x00\xFF\xFF\xFF",
        "\xFF\x00\x00\xFF\xFF\x00\x00\x00", "\xFF\x00\x00\xFF\xFF\x00\x00\xFF",
        "\xFF\x00\x00\xFF\xFF\x00\xFF\x00", "\xFF\x00\x00\xFF\xFF\x00\xFF\xFF",
        "\xFF\x00\x00\xFF\xFF\xFF\x00\x00", "\xFF\x00\x00\xFF\xFF\xFF\x00\xFF",
        "\xFF\x00\x00\xFF\xFF\xFF\xFF\x00", "\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF",
        "\xFF\x00\xFF\x00\x00\x00\x00\x00", "\xFF\x00\xFF\x00\x00\x00\x00\xFF",
        "\xFF\x00\xFF\x00\x00\x00\xFF\x00", "\xFF\x00\xFF\x00\x00\x00\xFF\xFF",
        "\xFF\x00\xFF\x00\x00\xFF\x00\x00", "\xFF\x00\xFF\x00\x00\xFF\x00\xFF",
        "\xFF\x00\xFF\x00\x00\xFF\xFF\x00", "\xFF\x00\xFF\x00\x00\xFF\xFF\xFF",
        "\xFF\x00\xFF\x00\xFF\x00\x00\x00", "\xFF\x00\xFF\x00\xFF\x00\x00\xFF",
        "\xFF\x00\xFF\x00\xFF\x00\xFF\x00", "\xFF\x00\xFF\x00\xFF\x00\xFF\xFF",
        "\xFF\x00\xFF\x00\xFF\xFF\x00\x00", "\xFF\x00\xFF\x00\xFF\xFF\x00\xFF",
        "\xFF\x00\xFF\x00\xFF\xFF\xFF\x00", "\xFF\x00\xFF\x00\xFF\xFF\xFF\xFF",
        "\xFF\x00\xFF\xFF\x00\x00\x00\x00", "\xFF\x00\xFF\xFF\x00\x00\x00\xFF",
        "\xFF\x00\xFF\xFF\x00\x00\xFF\x00", "\xFF\x00\xFF\xFF\x00\x00\xFF\xFF",
        "\xFF\x00\xFF\xFF\x00\xFF\x00\x00", "\xFF\x00\xFF\xFF\x00\xFF\x00\xFF",
        "\xFF\x00\xFF\xFF\x00\xFF\xFF\x00", "\xFF\x00\xFF\xFF\x00\xFF\xFF\xFF",
        "\xFF\x00\xFF\xFF\xFF\x00\x00\x00", "\xFF\x00\xFF\xFF\xFF\x00\x00\xFF",
        "\xFF\x00\xFF\xFF\xFF\x00\xFF\x00", "\xFF\x00\xFF\xFF\xFF\x00\xFF\xFF",
        "\xFF\x00\xFF\xFF\xFF\xFF\x00\x00", "\xFF\x00\xFF\xFF\xFF\xFF\x00\xFF",
        "\xFF\x00\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\x00\xFF\xFF\xFF\xFF\xFF\xFF",
        "\xFF\xFF\x00\x00\x00\x00\x00\x00", "\xFF\xFF\x00\x00\x00\x00\x00\xFF",
        "\xFF\xFF\x00\x00\x00\x00\xFF\x00", "\xFF\xFF\x00\x00\x00\x00\xFF\xFF",
        "\xFF\xFF\x00\x00\x00\xFF\x00\x00", "\xFF\xFF\x00\x00\x00\xFF\x00\xFF",
        "\xFF\xFF\x00\x00\x00\xFF\xFF\x00", "\xFF\xFF\x00\x00\x00\xFF\xFF\xFF",
        "\xFF\xFF\x00\x00\xFF\x00\x00\x00", "\xFF\xFF\x00\x00\xFF\x00\x00\xFF",
        "\xFF\xFF\x00\x00\xFF\x00\xFF\x00", "\xFF\xFF\x00\x00\xFF\x00\xFF\xFF",
        "\xFF\xFF\x00\x00\xFF\xFF\x00\x00", "\xFF\xFF\x00\x00\xFF\xFF\x00\xFF",
        "\xFF\xFF\x00\x00\xFF\xFF\xFF\x00", "\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF",
        "\xFF\xFF\x00\xFF\x00\x00\x00\x00", "\xFF\xFF\x00\xFF\x00\x00\x00\xFF",
        "\xFF\xFF\x00\xFF\x00\x00\xFF\x00", "\xFF\xFF\x00\xFF\x00\x00\xFF\xFF",
        "\xFF\xFF\x00\xFF\x00\xFF\x00\x00", "\xFF\xFF\x00\xFF\x00\xFF\x00\xFF",
        "\xFF\xFF\x00\xFF\x00\xFF\xFF\x00", "\xFF\xFF\x00\xFF\x00\xFF\xFF\xFF",
        "\xFF\xFF\x00\xFF\xFF\x00\x00\x00", "\xFF\xFF\x00\xFF\xFF\x00\x00\xFF",
        "\xFF\xFF\x00\xFF\xFF\x00\xFF\x00", "\xFF\xFF\x00\xFF\xFF\x00\xFF\xFF",
        "\xFF\xFF\x00\xFF\xFF\xFF\x00\x00", "\xFF\xFF\x00\xFF\xFF\xFF\x00\xFF",
        "\xFF\xFF\x00\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\x00\xFF\xFF\xFF\xFF\xFF",
        "\xFF\xFF\xFF\x00\x00\x00\x00\x00", "\xFF\xFF\xFF\x00\x00\x00\x00\xFF",
        "\xFF\xFF\xFF\x00\x00\x00\xFF\x00", "\xFF\xFF\xFF\x00\x00\x00\xFF\xFF",
        "\xFF\xFF\xFF\x00\x00\xFF\x00\x00", "\xFF\xFF\xFF\x00\x00\xFF\x00\xFF",
        "\xFF\xFF\xFF\x00\x00\xFF\xFF\x00", "\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF",
        "\xFF\xFF\xFF\x00\xFF\x00\x00\x00", "\xFF\xFF\xFF\x00\xFF\x00\x00\xFF",
        "\xFF\xFF\xFF\x00\xFF\x00\xFF\x00", "\xFF\xFF\xFF\x00\xFF\x00\xFF\xFF",
        "\xFF\xFF\xFF\x00\xFF\xFF\x00\x00", "\xFF\xFF\xFF\x00\xFF\xFF\x00\xFF",
        "\xFF\xFF\xFF\x00\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\x00\xFF\xFF\xFF\xFF",
        "\xFF\xFF\xFF\xFF\x00\x00\x00\x00", "\xFF\xFF\xFF\xFF\x00\x00\x00\xFF",
        "\xFF\xFF\xFF\xFF\x00\x00\xFF\x00", "\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF",
        "\xFF\xFF\xFF\xFF\x00\xFF\x00\x00", "\xFF\xFF\xFF\xFF\x00\xFF\x00\xFF",
        "\xFF\xFF\xFF\xFF\x00\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\x00\xFF\xFF\xFF",
        "\xFF\xFF\xFF\xFF\xFF\x00\x00\x00", "\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF",
        "\xFF\xFF\xFF\xFF\xFF\x00\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\x00\xFF\xFF",
        "\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\x00\xFF",
        "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
    );

    /**
     * IP mapping helper table.
     *
     * Indexing this table with each source byte performs the initial bit permutation.
     *
     * @var array
     * @access private
     */
    var $ipmap = array(
        0x00, 0x10, 0x01, 0x11, 0x20, 0x30, 0x21, 0x31,
        0x02, 0x12, 0x03, 0x13, 0x22, 0x32, 0x23, 0x33,
        0x40, 0x50, 0x41, 0x51, 0x60, 0x70, 0x61, 0x71,
        0x42, 0x52, 0x43, 0x53, 0x62, 0x72, 0x63, 0x73,
        0x04, 0x14, 0x05, 0x15, 0x24, 0x34, 0x25, 0x35,
        0x06, 0x16, 0x07, 0x17, 0x26, 0x36, 0x27, 0x37,
        0x44, 0x54, 0x45, 0x55, 0x64, 0x74, 0x65, 0x75,
        0x46, 0x56, 0x47, 0x57, 0x66, 0x76, 0x67, 0x77,
        0x80, 0x90, 0x81, 0x91, 0xA0, 0xB0, 0xA1, 0xB1,
        0x82, 0x92, 0x83, 0x93, 0xA2, 0xB2, 0xA3, 0xB3,
        0xC0, 0xD0, 0xC1, 0xD1, 0xE0, 0xF0, 0xE1, 0xF1,
        0xC2, 0xD2, 0xC3, 0xD3, 0xE2, 0xF2, 0xE3, 0xF3,
        0x84, 0x94, 0x85, 0x95, 0xA4, 0xB4, 0xA5, 0xB5,
        0x86, 0x96, 0x87, 0x97, 0xA6, 0xB6, 0xA7, 0xB7,
        0xC4, 0xD4, 0xC5, 0xD5, 0xE4, 0xF4, 0xE5, 0xF5,
        0xC6, 0xD6, 0xC7, 0xD7, 0xE6, 0xF6, 0xE7, 0xF7,
        0x08, 0x18, 0x09, 0x19, 0x28, 0x38, 0x29, 0x39,
        0x0A, 0x1A, 0x0B, 0x1B, 0x2A, 0x3A, 0x2B, 0x3B,
        0x48, 0x58, 0x49, 0x59, 0x68, 0x78, 0x69, 0x79,
        0x4A, 0x5A, 0x4B, 0x5B, 0x6A, 0x7A, 0x6B, 0x7B,
        0x0C, 0x1C, 0x0D, 0x1D, 0x2C, 0x3C, 0x2D, 0x3D,
        0x0E, 0x1E, 0x0F, 0x1F, 0x2E, 0x3E, 0x2F, 0x3F,
        0x4C, 0x5C, 0x4D, 0x5D, 0x6C, 0x7C, 0x6D, 0x7D,
        0x4E, 0x5E, 0x4F, 0x5F, 0x6E, 0x7E, 0x6F, 0x7F,
        0x88, 0x98, 0x89, 0x99, 0xA8, 0xB8, 0xA9, 0xB9,
        0x8A, 0x9A, 0x8B, 0x9B, 0xAA, 0xBA, 0xAB, 0xBB,
        0xC8, 0xD8, 0xC9, 0xD9, 0xE8, 0xF8, 0xE9, 0xF9,
        0xCA, 0xDA, 0xCB, 0xDB, 0xEA, 0xFA, 0xEB, 0xFB,
        0x8C, 0x9C, 0x8D, 0x9D, 0xAC, 0xBC, 0xAD, 0xBD,
        0x8E, 0x9E, 0x8F, 0x9F, 0xAE, 0xBE, 0xAF, 0xBF,
        0xCC, 0xDC, 0xCD, 0xDD, 0xEC, 0xFC, 0xED, 0xFD,
        0xCE, 0xDE, 0xCF, 0xDF, 0xEE, 0xFE, 0xEF, 0xFF
    );

    /**
     * Inverse IP mapping helper table.
     * Indexing this table with a byte value reverses the bit order.
     *
     * @var array
     * @access private
     */
    var $invipmap = array(
        0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
        0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
        0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
        0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
        0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
        0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
        0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
        0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
        0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
        0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
        0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
        0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
        0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
        0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
        0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
        0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
        0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
        0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
        0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
        0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
        0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
        0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
        0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
        0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
        0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
        0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
        0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
        0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
        0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
        0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
        0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
        0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
    );

    /**
     * Pre-permuted S-box1
     *
     * Each box ($sbox1-$sbox8) has been vectorized, then each value pre-permuted using the
     * P table: concatenation can then be replaced by exclusive ORs.
     *
     * @var array
     * @access private
     */
    var $sbox1 = array(
        0x00808200, 0x00000000, 0x00008000, 0x00808202,
        0x00808002, 0x00008202, 0x00000002, 0x00008000,
        0x00000200, 0x00808200, 0x00808202, 0x00000200,
        0x00800202, 0x00808002, 0x00800000, 0x00000002,
        0x00000202, 0x00800200, 0x00800200, 0x00008200,
        0x00008200, 0x00808000, 0x00808000, 0x00800202,
        0x00008002, 0x00800002, 0x00800002, 0x00008002,
        0x00000000, 0x00000202, 0x00008202, 0x00800000,
        0x00008000, 0x00808202, 0x00000002, 0x00808000,
        0x00808200, 0x00800000, 0x00800000, 0x00000200,
        0x00808002, 0x00008000, 0x00008200, 0x00800002,
        0x00000200, 0x00000002, 0x00800202, 0x00008202,
        0x00808202, 0x00008002, 0x00808000, 0x00800202,
        0x00800002, 0x00000202, 0x00008202, 0x00808200,
        0x00000202, 0x00800200, 0x00800200, 0x00000000,
        0x00008002, 0x00008200, 0x00000000, 0x00808002
    );

    /**
     * Pre-permuted S-box2
     *
     * @var array
     * @access private
     */
    var $sbox2 = array(
        0x40084010, 0x40004000, 0x00004000, 0x00084010,
        0x00080000, 0x00000010, 0x40080010, 0x40004010,
        0x40000010, 0x40084010, 0x40084000, 0x40000000,
        0x40004000, 0x00080000, 0x00000010, 0x40080010,
        0x00084000, 0x00080010, 0x40004010, 0x00000000,
        0x40000000, 0x00004000, 0x00084010, 0x40080000,
        0x00080010, 0x40000010, 0x00000000, 0x00084000,
        0x00004010, 0x40084000, 0x40080000, 0x00004010,
        0x00000000, 0x00084010, 0x40080010, 0x00080000,
        0x40004010, 0x40080000, 0x40084000, 0x00004000,
        0x40080000, 0x40004000, 0x00000010, 0x40084010,
        0x00084010, 0x00000010, 0x00004000, 0x40000000,
        0x00004010, 0x40084000, 0x00080000, 0x40000010,
        0x00080010, 0x40004010, 0x40000010, 0x00080010,
        0x00084000, 0x00000000, 0x40004000, 0x00004010,
        0x40000000, 0x40080010, 0x40084010, 0x00084000
    );

    /**
     * Pre-permuted S-box3
     *
     * @var array
     * @access private
     */
    var $sbox3 = array(
        0x00000104, 0x04010100, 0x00000000, 0x04010004,
        0x04000100, 0x00000000, 0x00010104, 0x04000100,
        0x00010004, 0x04000004, 0x04000004, 0x00010000,
        0x04010104, 0x00010004, 0x04010000, 0x00000104,
        0x04000000, 0x00000004, 0x04010100, 0x00000100,
        0x00010100, 0x04010000, 0x04010004, 0x00010104,
        0x04000104, 0x00010100, 0x00010000, 0x04000104,
        0x00000004, 0x04010104, 0x00000100, 0x04000000,
        0x04010100, 0x04000000, 0x00010004, 0x00000104,
        0x00010000, 0x04010100, 0x04000100, 0x00000000,
        0x00000100, 0x00010004, 0x04010104, 0x04000100,
        0x04000004, 0x00000100, 0x00000000, 0x04010004,
        0x04000104, 0x00010000, 0x04000000, 0x04010104,
        0x00000004, 0x00010104, 0x00010100, 0x04000004,
        0x04010000, 0x04000104, 0x00000104, 0x04010000,
        0x00010104, 0x00000004, 0x04010004, 0x00010100
    );

    /**
     * Pre-permuted S-box4
     *
     * @var array
     * @access private
     */
    var $sbox4 = array(
        0x80401000, 0x80001040, 0x80001040, 0x00000040,
        0x00401040, 0x80400040, 0x80400000, 0x80001000,
        0x00000000, 0x00401000, 0x00401000, 0x80401040,
        0x80000040, 0x00000000, 0x00400040, 0x80400000,
        0x80000000, 0x00001000, 0x00400000, 0x80401000,
        0x00000040, 0x00400000, 0x80001000, 0x00001040,
        0x80400040, 0x80000000, 0x00001040, 0x00400040,
        0x00001000, 0x00401040, 0x80401040, 0x80000040,
        0x00400040, 0x80400000, 0x00401000, 0x80401040,
        0x80000040, 0x00000000, 0x00000000, 0x00401000,
        0x00001040, 0x00400040, 0x80400040, 0x80000000,
        0x80401000, 0x80001040, 0x80001040, 0x00000040,
        0x80401040, 0x80000040, 0x80000000, 0x00001000,
        0x80400000, 0x80001000, 0x00401040, 0x80400040,
        0x80001000, 0x00001040, 0x00400000, 0x80401000,
        0x00000040, 0x00400000, 0x00001000, 0x00401040
    );

    /**
     * Pre-permuted S-box5
     *
     * @var array
     * @access private
     */
    var $sbox5 = array(
        0x00000080, 0x01040080, 0x01040000, 0x21000080,
        0x00040000, 0x00000080, 0x20000000, 0x01040000,
        0x20040080, 0x00040000, 0x01000080, 0x20040080,
        0x21000080, 0x21040000, 0x00040080, 0x20000000,
        0x01000000, 0x20040000, 0x20040000, 0x00000000,
        0x20000080, 0x21040080, 0x21040080, 0x01000080,
        0x21040000, 0x20000080, 0x00000000, 0x21000000,
        0x01040080, 0x01000000, 0x21000000, 0x00040080,
        0x00040000, 0x21000080, 0x00000080, 0x01000000,
        0x20000000, 0x01040000, 0x21000080, 0x20040080,
        0x01000080, 0x20000000, 0x21040000, 0x01040080,
        0x20040080, 0x00000080, 0x01000000, 0x21040000,
        0x21040080, 0x00040080, 0x21000000, 0x21040080,
        0x01040000, 0x00000000, 0x20040000, 0x21000000,
        0x00040080, 0x01000080, 0x20000080, 0x00040000,
        0x00000000, 0x20040000, 0x01040080, 0x20000080
    );

    /**
     * Pre-permuted S-box6
     *
     * @var array
     * @access private
     */
    var $sbox6 = array(
        0x10000008, 0x10200000, 0x00002000, 0x10202008,
        0x10200000, 0x00000008, 0x10202008, 0x00200000,
        0x10002000, 0x00202008, 0x00200000, 0x10000008,
        0x00200008, 0x10002000, 0x10000000, 0x00002008,
        0x00000000, 0x00200008, 0x10002008, 0x00002000,
        0x00202000, 0x10002008, 0x00000008, 0x10200008,
        0x10200008, 0x00000000, 0x00202008, 0x10202000,
        0x00002008, 0x00202000, 0x10202000, 0x10000000,
        0x10002000, 0x00000008, 0x10200008, 0x00202000,
        0x10202008, 0x00200000, 0x00002008, 0x10000008,
        0x00200000, 0x10002000, 0x10000000, 0x00002008,
        0x10000008, 0x10202008, 0x00202000, 0x10200000,
        0x00202008, 0x10202000, 0x00000000, 0x10200008,
        0x00000008, 0x00002000, 0x10200000, 0x00202008,
        0x00002000, 0x00200008, 0x10002008, 0x00000000,
        0x10202000, 0x10000000, 0x00200008, 0x10002008
    );

    /**
     * Pre-permuted S-box7
     *
     * @var array
     * @access private
     */
    var $sbox7 = array(
        0x00100000, 0x02100001, 0x02000401, 0x00000000,
        0x00000400, 0x02000401, 0x00100401, 0x02100400,
        0x02100401, 0x00100000, 0x00000000, 0x02000001,
        0x00000001, 0x02000000, 0x02100001, 0x00000401,
        0x02000400, 0x00100401, 0x00100001, 0x02000400,
        0x02000001, 0x02100000, 0x02100400, 0x00100001,
        0x02100000, 0x00000400, 0x00000401, 0x02100401,
        0x00100400, 0x00000001, 0x02000000, 0x00100400,
        0x02000000, 0x00100400, 0x00100000, 0x02000401,
        0x02000401, 0x02100001, 0x02100001, 0x00000001,
        0x00100001, 0x02000000, 0x02000400, 0x00100000,
        0x02100400, 0x00000401, 0x00100401, 0x02100400,
        0x00000401, 0x02000001, 0x02100401, 0x02100000,
        0x00100400, 0x00000000, 0x00000001, 0x02100401,
        0x00000000, 0x00100401, 0x02100000, 0x00000400,
        0x02000001, 0x02000400, 0x00000400, 0x00100001
    );

    /**
     * Pre-permuted S-box8
     *
     * @var array
     * @access private
     */
    var $sbox8 = array(
        0x08000820, 0x00000800, 0x00020000, 0x08020820,
        0x08000000, 0x08000820, 0x00000020, 0x08000000,
        0x00020020, 0x08020000, 0x08020820, 0x00020800,
        0x08020800, 0x00020820, 0x00000800, 0x00000020,
        0x08020000, 0x08000020, 0x08000800, 0x00000820,
        0x00020800, 0x00020020, 0x08020020, 0x08020800,
        0x00000820, 0x00000000, 0x00000000, 0x08020020,
        0x08000020, 0x08000800, 0x00020820, 0x00020000,
        0x00020820, 0x00020000, 0x08020800, 0x00000800,
        0x00000020, 0x08020020, 0x00000800, 0x00020820,
        0x08000800, 0x00000020, 0x08000020, 0x08020000,
        0x08020020, 0x08000000, 0x00020000, 0x08000820,
        0x00000000, 0x08020820, 0x00020020, 0x08000020,
        0x08020000, 0x08000800, 0x08000820, 0x00000000,
        0x08020820, 0x00020800, 0x00020800, 0x00000820,
        0x00000820, 0x00020020, 0x08000000, 0x08020800
    );

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::isValidEngine()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        if ($this->key_length_max == 8) {
            if ($engine == CRYPT_ENGINE_OPENSSL) {
                $this->cipher_name_openssl_ecb = 'des-ecb';
                $this->cipher_name_openssl = 'des-' . $this->_openssl_translate_mode();
            }
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Sets the key.
     *
     * Keys can be of any length.  DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we
     * only use the first eight, if $key has more then eight characters in it, and pad $key with the
     * null byte if it is less then eight characters long.
     *
     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
     *
     * If the key is not explicitly set, it'll be assumed to be all zero's.
     *
     * @see Crypt_Base::setKey()
     * @access public
     * @param string $key
     */
    function setKey($key)
    {
        // We check/cut here only up to max length of the key.
        // Key padding to the proper length will be done in _setupKey()
        if (strlen($key) > $this->key_length_max) {
            $key = substr($key, 0, $this->key_length_max);
        }

        // Sets the key
        parent::setKey($key);
    }

    /**
     * Encrypts a block
     *
     * @see Crypt_Base::_encryptBlock()
     * @see Crypt_Base::encrypt()
     * @see self::encrypt()
     * @access private
     * @param string $in
     * @return string
     */
    function _encryptBlock($in)
    {
        return $this->_processBlock($in, CRYPT_DES_ENCRYPT);
    }

    /**
     * Decrypts a block
     *
     * @see Crypt_Base::_decryptBlock()
     * @see Crypt_Base::decrypt()
     * @see self::decrypt()
     * @access private
     * @param string $in
     * @return string
     */
    function _decryptBlock($in)
    {
        return $this->_processBlock($in, CRYPT_DES_DECRYPT);
    }

    /**
     * Encrypts or decrypts a 64-bit block
     *
     * $mode should be either CRYPT_DES_ENCRYPT or CRYPT_DES_DECRYPT.  See
     * {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general
     * idea of what this function does.
     *
     * @see self::_encryptBlock()
     * @see self::_decryptBlock()
     * @access private
     * @param string $block
     * @param int $mode
     * @return string
     */
    function _processBlock($block, $mode)
    {
        static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
        if (!$sbox1) {
            $sbox1 = array_map("intval", $this->sbox1);
            $sbox2 = array_map("intval", $this->sbox2);
            $sbox3 = array_map("intval", $this->sbox3);
            $sbox4 = array_map("intval", $this->sbox4);
            $sbox5 = array_map("intval", $this->sbox5);
            $sbox6 = array_map("intval", $this->sbox6);
            $sbox7 = array_map("intval", $this->sbox7);
            $sbox8 = array_map("intval", $this->sbox8);
            /* Merge $shuffle with $[inv]ipmap */
            for ($i = 0; $i < 256; ++$i) {
                $shuffleip[]    =  $this->shuffle[$this->ipmap[$i]];
                $shuffleinvip[] =  $this->shuffle[$this->invipmap[$i]];
            }
        }

        $keys  = $this->keys[$mode];
        $ki    = -1;

        // Do the initial IP permutation.
        $t = unpack('Nl/Nr', $block);
        list($l, $r) = array($t['l'], $t['r']);
        $block = ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                 ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                 ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                 ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                 ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                 ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                 ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                 ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");

        // Extract L0 and R0.
        $t = unpack('Nl/Nr', $block);
        list($l, $r) = array($t['l'], $t['r']);

        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
            // Perform the 16 steps.
            for ($i = 0; $i < 16; $i++) {
                // start of "the Feistel (F) function" - see the following URL:
                // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
                // Merge key schedule.
                $b1 = (($r >>  3) & 0x1FFFFFFF) ^ ($r << 29) ^ $keys[++$ki];
                $b2 = (($r >> 31) & 0x00000001) ^ ($r <<  1) ^ $keys[++$ki];

                // S-box indexing.
                $t = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ $l;
                // end of "the Feistel (F) function"

                $l = $r;
                $r = $t;
            }

            // Last step should not permute L & R.
            $t = $l;
            $l = $r;
            $r = $t;
        }

        // Perform the inverse IP permutation.
        return ($shuffleinvip[($r >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
               ($shuffleinvip[($l >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
               ($shuffleinvip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
               ($shuffleinvip[($l >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
               ($shuffleinvip[($r >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
               ($shuffleinvip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
               ($shuffleinvip[ $r        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
               ($shuffleinvip[ $l        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
    }

    /**
     * Creates the key schedule
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->des_rounds === $this->kl['des_rounds']) {
            // already expanded
            return;
        }
        $this->kl = array('key' => $this->key, 'des_rounds' => $this->des_rounds);

        static $shifts = array( // number of key bits shifted per round
            1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
        );

        static $pc1map = array(
            0x00, 0x00, 0x08, 0x08, 0x04, 0x04, 0x0C, 0x0C,
            0x02, 0x02, 0x0A, 0x0A, 0x06, 0x06, 0x0E, 0x0E,
            0x10, 0x10, 0x18, 0x18, 0x14, 0x14, 0x1C, 0x1C,
            0x12, 0x12, 0x1A, 0x1A, 0x16, 0x16, 0x1E, 0x1E,
            0x20, 0x20, 0x28, 0x28, 0x24, 0x24, 0x2C, 0x2C,
            0x22, 0x22, 0x2A, 0x2A, 0x26, 0x26, 0x2E, 0x2E,
            0x30, 0x30, 0x38, 0x38, 0x34, 0x34, 0x3C, 0x3C,
            0x32, 0x32, 0x3A, 0x3A, 0x36, 0x36, 0x3E, 0x3E,
            0x40, 0x40, 0x48, 0x48, 0x44, 0x44, 0x4C, 0x4C,
            0x42, 0x42, 0x4A, 0x4A, 0x46, 0x46, 0x4E, 0x4E,
            0x50, 0x50, 0x58, 0x58, 0x54, 0x54, 0x5C, 0x5C,
            0x52, 0x52, 0x5A, 0x5A, 0x56, 0x56, 0x5E, 0x5E,
            0x60, 0x60, 0x68, 0x68, 0x64, 0x64, 0x6C, 0x6C,
            0x62, 0x62, 0x6A, 0x6A, 0x66, 0x66, 0x6E, 0x6E,
            0x70, 0x70, 0x78, 0x78, 0x74, 0x74, 0x7C, 0x7C,
            0x72, 0x72, 0x7A, 0x7A, 0x76, 0x76, 0x7E, 0x7E,
            0x80, 0x80, 0x88, 0x88, 0x84, 0x84, 0x8C, 0x8C,
            0x82, 0x82, 0x8A, 0x8A, 0x86, 0x86, 0x8E, 0x8E,
            0x90, 0x90, 0x98, 0x98, 0x94, 0x94, 0x9C, 0x9C,
            0x92, 0x92, 0x9A, 0x9A, 0x96, 0x96, 0x9E, 0x9E,
            0xA0, 0xA0, 0xA8, 0xA8, 0xA4, 0xA4, 0xAC, 0xAC,
            0xA2, 0xA2, 0xAA, 0xAA, 0xA6, 0xA6, 0xAE, 0xAE,
            0xB0, 0xB0, 0xB8, 0xB8, 0xB4, 0xB4, 0xBC, 0xBC,
            0xB2, 0xB2, 0xBA, 0xBA, 0xB6, 0xB6, 0xBE, 0xBE,
            0xC0, 0xC0, 0xC8, 0xC8, 0xC4, 0xC4, 0xCC, 0xCC,
            0xC2, 0xC2, 0xCA, 0xCA, 0xC6, 0xC6, 0xCE, 0xCE,
            0xD0, 0xD0, 0xD8, 0xD8, 0xD4, 0xD4, 0xDC, 0xDC,
            0xD2, 0xD2, 0xDA, 0xDA, 0xD6, 0xD6, 0xDE, 0xDE,
            0xE0, 0xE0, 0xE8, 0xE8, 0xE4, 0xE4, 0xEC, 0xEC,
            0xE2, 0xE2, 0xEA, 0xEA, 0xE6, 0xE6, 0xEE, 0xEE,
            0xF0, 0xF0, 0xF8, 0xF8, 0xF4, 0xF4, 0xFC, 0xFC,
            0xF2, 0xF2, 0xFA, 0xFA, 0xF6, 0xF6, 0xFE, 0xFE
        );

        // Mapping tables for the PC-2 transformation.
        static $pc2mapc1 = array(
            0x00000000, 0x00000400, 0x00200000, 0x00200400,
            0x00000001, 0x00000401, 0x00200001, 0x00200401,
            0x02000000, 0x02000400, 0x02200000, 0x02200400,
            0x02000001, 0x02000401, 0x02200001, 0x02200401
        );
        static $pc2mapc2 = array(
            0x00000000, 0x00000800, 0x08000000, 0x08000800,
            0x00010000, 0x00010800, 0x08010000, 0x08010800,
            0x00000000, 0x00000800, 0x08000000, 0x08000800,
            0x00010000, 0x00010800, 0x08010000, 0x08010800,
            0x00000100, 0x00000900, 0x08000100, 0x08000900,
            0x00010100, 0x00010900, 0x08010100, 0x08010900,
            0x00000100, 0x00000900, 0x08000100, 0x08000900,
            0x00010100, 0x00010900, 0x08010100, 0x08010900,
            0x00000010, 0x00000810, 0x08000010, 0x08000810,
            0x00010010, 0x00010810, 0x08010010, 0x08010810,
            0x00000010, 0x00000810, 0x08000010, 0x08000810,
            0x00010010, 0x00010810, 0x08010010, 0x08010810,
            0x00000110, 0x00000910, 0x08000110, 0x08000910,
            0x00010110, 0x00010910, 0x08010110, 0x08010910,
            0x00000110, 0x00000910, 0x08000110, 0x08000910,
            0x00010110, 0x00010910, 0x08010110, 0x08010910,
            0x00040000, 0x00040800, 0x08040000, 0x08040800,
            0x00050000, 0x00050800, 0x08050000, 0x08050800,
            0x00040000, 0x00040800, 0x08040000, 0x08040800,
            0x00050000, 0x00050800, 0x08050000, 0x08050800,
            0x00040100, 0x00040900, 0x08040100, 0x08040900,
            0x00050100, 0x00050900, 0x08050100, 0x08050900,
            0x00040100, 0x00040900, 0x08040100, 0x08040900,
            0x00050100, 0x00050900, 0x08050100, 0x08050900,
            0x00040010, 0x00040810, 0x08040010, 0x08040810,
            0x00050010, 0x00050810, 0x08050010, 0x08050810,
            0x00040010, 0x00040810, 0x08040010, 0x08040810,
            0x00050010, 0x00050810, 0x08050010, 0x08050810,
            0x00040110, 0x00040910, 0x08040110, 0x08040910,
            0x00050110, 0x00050910, 0x08050110, 0x08050910,
            0x00040110, 0x00040910, 0x08040110, 0x08040910,
            0x00050110, 0x00050910, 0x08050110, 0x08050910,
            0x01000000, 0x01000800, 0x09000000, 0x09000800,
            0x01010000, 0x01010800, 0x09010000, 0x09010800,
            0x01000000, 0x01000800, 0x09000000, 0x09000800,
            0x01010000, 0x01010800, 0x09010000, 0x09010800,
            0x01000100, 0x01000900, 0x09000100, 0x09000900,
            0x01010100, 0x01010900, 0x09010100, 0x09010900,
            0x01000100, 0x01000900, 0x09000100, 0x09000900,
            0x01010100, 0x01010900, 0x09010100, 0x09010900,
            0x01000010, 0x01000810, 0x09000010, 0x09000810,
            0x01010010, 0x01010810, 0x09010010, 0x09010810,
            0x01000010, 0x01000810, 0x09000010, 0x09000810,
            0x01010010, 0x01010810, 0x09010010, 0x09010810,
            0x01000110, 0x01000910, 0x09000110, 0x09000910,
            0x01010110, 0x01010910, 0x09010110, 0x09010910,
            0x01000110, 0x01000910, 0x09000110, 0x09000910,
            0x01010110, 0x01010910, 0x09010110, 0x09010910,
            0x01040000, 0x01040800, 0x09040000, 0x09040800,
            0x01050000, 0x01050800, 0x09050000, 0x09050800,
            0x01040000, 0x01040800, 0x09040000, 0x09040800,
            0x01050000, 0x01050800, 0x09050000, 0x09050800,
            0x01040100, 0x01040900, 0x09040100, 0x09040900,
            0x01050100, 0x01050900, 0x09050100, 0x09050900,
            0x01040100, 0x01040900, 0x09040100, 0x09040900,
            0x01050100, 0x01050900, 0x09050100, 0x09050900,
            0x01040010, 0x01040810, 0x09040010, 0x09040810,
            0x01050010, 0x01050810, 0x09050010, 0x09050810,
            0x01040010, 0x01040810, 0x09040010, 0x09040810,
            0x01050010, 0x01050810, 0x09050010, 0x09050810,
            0x01040110, 0x01040910, 0x09040110, 0x09040910,
            0x01050110, 0x01050910, 0x09050110, 0x09050910,
            0x01040110, 0x01040910, 0x09040110, 0x09040910,
            0x01050110, 0x01050910, 0x09050110, 0x09050910
        );
        static $pc2mapc3 = array(
            0x00000000, 0x00000004, 0x00001000, 0x00001004,
            0x00000000, 0x00000004, 0x00001000, 0x00001004,
            0x10000000, 0x10000004, 0x10001000, 0x10001004,
            0x10000000, 0x10000004, 0x10001000, 0x10001004,
            0x00000020, 0x00000024, 0x00001020, 0x00001024,
            0x00000020, 0x00000024, 0x00001020, 0x00001024,
            0x10000020, 0x10000024, 0x10001020, 0x10001024,
            0x10000020, 0x10000024, 0x10001020, 0x10001024,
            0x00080000, 0x00080004, 0x00081000, 0x00081004,
            0x00080000, 0x00080004, 0x00081000, 0x00081004,
            0x10080000, 0x10080004, 0x10081000, 0x10081004,
            0x10080000, 0x10080004, 0x10081000, 0x10081004,
            0x00080020, 0x00080024, 0x00081020, 0x00081024,
            0x00080020, 0x00080024, 0x00081020, 0x00081024,
            0x10080020, 0x10080024, 0x10081020, 0x10081024,
            0x10080020, 0x10080024, 0x10081020, 0x10081024,
            0x20000000, 0x20000004, 0x20001000, 0x20001004,
            0x20000000, 0x20000004, 0x20001000, 0x20001004,
            0x30000000, 0x30000004, 0x30001000, 0x30001004,
            0x30000000, 0x30000004, 0x30001000, 0x30001004,
            0x20000020, 0x20000024, 0x20001020, 0x20001024,
            0x20000020, 0x20000024, 0x20001020, 0x20001024,
            0x30000020, 0x30000024, 0x30001020, 0x30001024,
            0x30000020, 0x30000024, 0x30001020, 0x30001024,
            0x20080000, 0x20080004, 0x20081000, 0x20081004,
            0x20080000, 0x20080004, 0x20081000, 0x20081004,
            0x30080000, 0x30080004, 0x30081000, 0x30081004,
            0x30080000, 0x30080004, 0x30081000, 0x30081004,
            0x20080020, 0x20080024, 0x20081020, 0x20081024,
            0x20080020, 0x20080024, 0x20081020, 0x20081024,
            0x30080020, 0x30080024, 0x30081020, 0x30081024,
            0x30080020, 0x30080024, 0x30081020, 0x30081024,
            0x00000002, 0x00000006, 0x00001002, 0x00001006,
            0x00000002, 0x00000006, 0x00001002, 0x00001006,
            0x10000002, 0x10000006, 0x10001002, 0x10001006,
            0x10000002, 0x10000006, 0x10001002, 0x10001006,
            0x00000022, 0x00000026, 0x00001022, 0x00001026,
            0x00000022, 0x00000026, 0x00001022, 0x00001026,
            0x10000022, 0x10000026, 0x10001022, 0x10001026,
            0x10000022, 0x10000026, 0x10001022, 0x10001026,
            0x00080002, 0x00080006, 0x00081002, 0x00081006,
            0x00080002, 0x00080006, 0x00081002, 0x00081006,
            0x10080002, 0x10080006, 0x10081002, 0x10081006,
            0x10080002, 0x10080006, 0x10081002, 0x10081006,
            0x00080022, 0x00080026, 0x00081022, 0x00081026,
            0x00080022, 0x00080026, 0x00081022, 0x00081026,
            0x10080022, 0x10080026, 0x10081022, 0x10081026,
            0x10080022, 0x10080026, 0x10081022, 0x10081026,
            0x20000002, 0x20000006, 0x20001002, 0x20001006,
            0x20000002, 0x20000006, 0x20001002, 0x20001006,
            0x30000002, 0x30000006, 0x30001002, 0x30001006,
            0x30000002, 0x30000006, 0x30001002, 0x30001006,
            0x20000022, 0x20000026, 0x20001022, 0x20001026,
            0x20000022, 0x20000026, 0x20001022, 0x20001026,
            0x30000022, 0x30000026, 0x30001022, 0x30001026,
            0x30000022, 0x30000026, 0x30001022, 0x30001026,
            0x20080002, 0x20080006, 0x20081002, 0x20081006,
            0x20080002, 0x20080006, 0x20081002, 0x20081006,
            0x30080002, 0x30080006, 0x30081002, 0x30081006,
            0x30080002, 0x30080006, 0x30081002, 0x30081006,
            0x20080022, 0x20080026, 0x20081022, 0x20081026,
            0x20080022, 0x20080026, 0x20081022, 0x20081026,
            0x30080022, 0x30080026, 0x30081022, 0x30081026,
            0x30080022, 0x30080026, 0x30081022, 0x30081026
        );
        static $pc2mapc4 = array(
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208
        );
        static $pc2mapd1 = array(
            0x00000000, 0x00000001, 0x08000000, 0x08000001,
            0x00200000, 0x00200001, 0x08200000, 0x08200001,
            0x00000002, 0x00000003, 0x08000002, 0x08000003,
            0x00200002, 0x00200003, 0x08200002, 0x08200003
        );
        static $pc2mapd2 = array(
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04
        );
        static $pc2mapd3 = array(
            0x00000000, 0x00010000, 0x02000000, 0x02010000,
            0x00000020, 0x00010020, 0x02000020, 0x02010020,
            0x00040000, 0x00050000, 0x02040000, 0x02050000,
            0x00040020, 0x00050020, 0x02040020, 0x02050020,
            0x00002000, 0x00012000, 0x02002000, 0x02012000,
            0x00002020, 0x00012020, 0x02002020, 0x02012020,
            0x00042000, 0x00052000, 0x02042000, 0x02052000,
            0x00042020, 0x00052020, 0x02042020, 0x02052020,
            0x00000000, 0x00010000, 0x02000000, 0x02010000,
            0x00000020, 0x00010020, 0x02000020, 0x02010020,
            0x00040000, 0x00050000, 0x02040000, 0x02050000,
            0x00040020, 0x00050020, 0x02040020, 0x02050020,
            0x00002000, 0x00012000, 0x02002000, 0x02012000,
            0x00002020, 0x00012020, 0x02002020, 0x02012020,
            0x00042000, 0x00052000, 0x02042000, 0x02052000,
            0x00042020, 0x00052020, 0x02042020, 0x02052020,
            0x00000010, 0x00010010, 0x02000010, 0x02010010,
            0x00000030, 0x00010030, 0x02000030, 0x02010030,
            0x00040010, 0x00050010, 0x02040010, 0x02050010,
            0x00040030, 0x00050030, 0x02040030, 0x02050030,
            0x00002010, 0x00012010, 0x02002010, 0x02012010,
            0x00002030, 0x00012030, 0x02002030, 0x02012030,
            0x00042010, 0x00052010, 0x02042010, 0x02052010,
            0x00042030, 0x00052030, 0x02042030, 0x02052030,
            0x00000010, 0x00010010, 0x02000010, 0x02010010,
            0x00000030, 0x00010030, 0x02000030, 0x02010030,
            0x00040010, 0x00050010, 0x02040010, 0x02050010,
            0x00040030, 0x00050030, 0x02040030, 0x02050030,
            0x00002010, 0x00012010, 0x02002010, 0x02012010,
            0x00002030, 0x00012030, 0x02002030, 0x02012030,
            0x00042010, 0x00052010, 0x02042010, 0x02052010,
            0x00042030, 0x00052030, 0x02042030, 0x02052030,
            0x20000000, 0x20010000, 0x22000000, 0x22010000,
            0x20000020, 0x20010020, 0x22000020, 0x22010020,
            0x20040000, 0x20050000, 0x22040000, 0x22050000,
            0x20040020, 0x20050020, 0x22040020, 0x22050020,
            0x20002000, 0x20012000, 0x22002000, 0x22012000,
            0x20002020, 0x20012020, 0x22002020, 0x22012020,
            0x20042000, 0x20052000, 0x22042000, 0x22052000,
            0x20042020, 0x20052020, 0x22042020, 0x22052020,
            0x20000000, 0x20010000, 0x22000000, 0x22010000,
            0x20000020, 0x20010020, 0x22000020, 0x22010020,
            0x20040000, 0x20050000, 0x22040000, 0x22050000,
            0x20040020, 0x20050020, 0x22040020, 0x22050020,
            0x20002000, 0x20012000, 0x22002000, 0x22012000,
            0x20002020, 0x20012020, 0x22002020, 0x22012020,
            0x20042000, 0x20052000, 0x22042000, 0x22052000,
            0x20042020, 0x20052020, 0x22042020, 0x22052020,
            0x20000010, 0x20010010, 0x22000010, 0x22010010,
            0x20000030, 0x20010030, 0x22000030, 0x22010030,
            0x20040010, 0x20050010, 0x22040010, 0x22050010,
            0x20040030, 0x20050030, 0x22040030, 0x22050030,
            0x20002010, 0x20012010, 0x22002010, 0x22012010,
            0x20002030, 0x20012030, 0x22002030, 0x22012030,
            0x20042010, 0x20052010, 0x22042010, 0x22052010,
            0x20042030, 0x20052030, 0x22042030, 0x22052030,
            0x20000010, 0x20010010, 0x22000010, 0x22010010,
            0x20000030, 0x20010030, 0x22000030, 0x22010030,
            0x20040010, 0x20050010, 0x22040010, 0x22050010,
            0x20040030, 0x20050030, 0x22040030, 0x22050030,
            0x20002010, 0x20012010, 0x22002010, 0x22012010,
            0x20002030, 0x20012030, 0x22002030, 0x22012030,
            0x20042010, 0x20052010, 0x22042010, 0x22052010,
            0x20042030, 0x20052030, 0x22042030, 0x22052030
        );
        static $pc2mapd4 = array(
            0x00000000, 0x00000400, 0x01000000, 0x01000400,
            0x00000000, 0x00000400, 0x01000000, 0x01000400,
            0x00000100, 0x00000500, 0x01000100, 0x01000500,
            0x00000100, 0x00000500, 0x01000100, 0x01000500,
            0x10000000, 0x10000400, 0x11000000, 0x11000400,
            0x10000000, 0x10000400, 0x11000000, 0x11000400,
            0x10000100, 0x10000500, 0x11000100, 0x11000500,
            0x10000100, 0x10000500, 0x11000100, 0x11000500,
            0x00080000, 0x00080400, 0x01080000, 0x01080400,
            0x00080000, 0x00080400, 0x01080000, 0x01080400,
            0x00080100, 0x00080500, 0x01080100, 0x01080500,
            0x00080100, 0x00080500, 0x01080100, 0x01080500,
            0x10080000, 0x10080400, 0x11080000, 0x11080400,
            0x10080000, 0x10080400, 0x11080000, 0x11080400,
            0x10080100, 0x10080500, 0x11080100, 0x11080500,
            0x10080100, 0x10080500, 0x11080100, 0x11080500,
            0x00000008, 0x00000408, 0x01000008, 0x01000408,
            0x00000008, 0x00000408, 0x01000008, 0x01000408,
            0x00000108, 0x00000508, 0x01000108, 0x01000508,
            0x00000108, 0x00000508, 0x01000108, 0x01000508,
            0x10000008, 0x10000408, 0x11000008, 0x11000408,
            0x10000008, 0x10000408, 0x11000008, 0x11000408,
            0x10000108, 0x10000508, 0x11000108, 0x11000508,
            0x10000108, 0x10000508, 0x11000108, 0x11000508,
            0x00080008, 0x00080408, 0x01080008, 0x01080408,
            0x00080008, 0x00080408, 0x01080008, 0x01080408,
            0x00080108, 0x00080508, 0x01080108, 0x01080508,
            0x00080108, 0x00080508, 0x01080108, 0x01080508,
            0x10080008, 0x10080408, 0x11080008, 0x11080408,
            0x10080008, 0x10080408, 0x11080008, 0x11080408,
            0x10080108, 0x10080508, 0x11080108, 0x11080508,
            0x10080108, 0x10080508, 0x11080108, 0x11080508,
            0x00001000, 0x00001400, 0x01001000, 0x01001400,
            0x00001000, 0x00001400, 0x01001000, 0x01001400,
            0x00001100, 0x00001500, 0x01001100, 0x01001500,
            0x00001100, 0x00001500, 0x01001100, 0x01001500,
            0x10001000, 0x10001400, 0x11001000, 0x11001400,
            0x10001000, 0x10001400, 0x11001000, 0x11001400,
            0x10001100, 0x10001500, 0x11001100, 0x11001500,
            0x10001100, 0x10001500, 0x11001100, 0x11001500,
            0x00081000, 0x00081400, 0x01081000, 0x01081400,
            0x00081000, 0x00081400, 0x01081000, 0x01081400,
            0x00081100, 0x00081500, 0x01081100, 0x01081500,
            0x00081100, 0x00081500, 0x01081100, 0x01081500,
            0x10081000, 0x10081400, 0x11081000, 0x11081400,
            0x10081000, 0x10081400, 0x11081000, 0x11081400,
            0x10081100, 0x10081500, 0x11081100, 0x11081500,
            0x10081100, 0x10081500, 0x11081100, 0x11081500,
            0x00001008, 0x00001408, 0x01001008, 0x01001408,
            0x00001008, 0x00001408, 0x01001008, 0x01001408,
            0x00001108, 0x00001508, 0x01001108, 0x01001508,
            0x00001108, 0x00001508, 0x01001108, 0x01001508,
            0x10001008, 0x10001408, 0x11001008, 0x11001408,
            0x10001008, 0x10001408, 0x11001008, 0x11001408,
            0x10001108, 0x10001508, 0x11001108, 0x11001508,
            0x10001108, 0x10001508, 0x11001108, 0x11001508,
            0x00081008, 0x00081408, 0x01081008, 0x01081408,
            0x00081008, 0x00081408, 0x01081008, 0x01081408,
            0x00081108, 0x00081508, 0x01081108, 0x01081508,
            0x00081108, 0x00081508, 0x01081108, 0x01081508,
            0x10081008, 0x10081408, 0x11081008, 0x11081408,
            0x10081008, 0x10081408, 0x11081008, 0x11081408,
            0x10081108, 0x10081508, 0x11081108, 0x11081508,
            0x10081108, 0x10081508, 0x11081108, 0x11081508
        );

        $keys = array();
        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
            // pad the key and remove extra characters as appropriate.
            $key = str_pad(substr($this->key, $des_round * 8, 8), 8, "\0");

            // Perform the PC/1 transformation and compute C and D.
            $t = unpack('Nl/Nr', $key);
            list($l, $r) = array($t['l'], $t['r']);
            $key = ($this->shuffle[$pc1map[ $r        & 0xFF]] & "\x80\x80\x80\x80\x80\x80\x80\x00") |
                   ($this->shuffle[$pc1map[($r >>  8) & 0xFF]] & "\x40\x40\x40\x40\x40\x40\x40\x00") |
                   ($this->shuffle[$pc1map[($r >> 16) & 0xFF]] & "\x20\x20\x20\x20\x20\x20\x20\x00") |
                   ($this->shuffle[$pc1map[($r >> 24) & 0xFF]] & "\x10\x10\x10\x10\x10\x10\x10\x00") |
                   ($this->shuffle[$pc1map[ $l        & 0xFF]] & "\x08\x08\x08\x08\x08\x08\x08\x00") |
                   ($this->shuffle[$pc1map[($l >>  8) & 0xFF]] & "\x04\x04\x04\x04\x04\x04\x04\x00") |
                   ($this->shuffle[$pc1map[($l >> 16) & 0xFF]] & "\x02\x02\x02\x02\x02\x02\x02\x00") |
                   ($this->shuffle[$pc1map[($l >> 24) & 0xFF]] & "\x01\x01\x01\x01\x01\x01\x01\x00");
            $key = unpack('Nc/Nd', $key);
            $c = ( $key['c'] >> 4) & 0x0FFFFFFF;
            $d = (($key['d'] >> 4) & 0x0FFFFFF0) | ($key['c'] & 0x0F);

            $keys[$des_round] = array(
                CRYPT_DES_ENCRYPT => array(),
                CRYPT_DES_DECRYPT => array_fill(0, 32, 0)
            );
            for ($i = 0, $ki = 31; $i < 16; ++$i, $ki-= 2) {
                $c <<= $shifts[$i];
                $c = ($c | ($c >> 28)) & 0x0FFFFFFF;
                $d <<= $shifts[$i];
                $d = ($d | ($d >> 28)) & 0x0FFFFFFF;

                // Perform the PC-2 transformation.
                $cp = $pc2mapc1[ $c >> 24        ] | $pc2mapc2[($c >> 16) & 0xFF] |
                      $pc2mapc3[($c >>  8) & 0xFF] | $pc2mapc4[ $c        & 0xFF];
                $dp = $pc2mapd1[ $d >> 24        ] | $pc2mapd2[($d >> 16) & 0xFF] |
                      $pc2mapd3[($d >>  8) & 0xFF] | $pc2mapd4[ $d        & 0xFF];

                // Reorder: odd bytes/even bytes. Push the result in key schedule.
                $val1 = ( $cp        & 0xFF000000) | (($cp <<  8) & 0x00FF0000) |
                        (($dp >> 16) & 0x0000FF00) | (($dp >>  8) & 0x000000FF);
                $val2 = (($cp <<  8) & 0xFF000000) | (($cp << 16) & 0x00FF0000) |
                        (($dp >>  8) & 0x0000FF00) | ( $dp        & 0x000000FF);
                $keys[$des_round][CRYPT_DES_ENCRYPT][       ] = $val1;
                $keys[$des_round][CRYPT_DES_DECRYPT][$ki - 1] = $val1;
                $keys[$des_round][CRYPT_DES_ENCRYPT][       ] = $val2;
                $keys[$des_round][CRYPT_DES_DECRYPT][$ki    ] = $val2;
            }
        }

        switch ($this->des_rounds) {
            case 3: // 3DES keys
                $this->keys = array(
                    CRYPT_DES_ENCRYPT => array_merge(
                        $keys[0][CRYPT_DES_ENCRYPT],
                        $keys[1][CRYPT_DES_DECRYPT],
                        $keys[2][CRYPT_DES_ENCRYPT]
                    ),
                    CRYPT_DES_DECRYPT => array_merge(
                        $keys[2][CRYPT_DES_DECRYPT],
                        $keys[1][CRYPT_DES_ENCRYPT],
                        $keys[0][CRYPT_DES_DECRYPT]
                    )
                );
                break;
            // case 1: // DES keys
            default:
                $this->keys = array(
                    CRYPT_DES_ENCRYPT => $keys[0][CRYPT_DES_ENCRYPT],
                    CRYPT_DES_DECRYPT => $keys[0][CRYPT_DES_DECRYPT]
                );
        }
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * @see Crypt_Base::_setupInlineCrypt()
     * @access private
     */
    function _setupInlineCrypt()
    {
        $lambda_functions =& Crypt_DES::_getLambdaFunctions();

        // Engine configuration for:
        // -  DES ($des_rounds == 1) or
        // - 3DES ($des_rounds == 3)
        $des_rounds = $this->des_rounds;

        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
        // (Currently, for Crypt_DES,       one generated $lambda_function cost on php5.5@32bit ~135kb unfreeable mem and ~230kb on php5.5@64bit)
        // (Currently, for Crypt_TripleDES, one generated $lambda_function cost on php5.5@32bit ~240kb unfreeable mem and ~340kb on php5.5@64bit)
        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one
        $gen_hi_opt_code = (bool)( count($lambda_functions) < 10 );

        // Generation of a unique hash for our generated code
        $code_hash = "Crypt_DES, $des_rounds, {$this->mode}";
        if ($gen_hi_opt_code) {
            // For hi-optimized code, we create for each combination of
            // $mode, $des_rounds and $this->key its own encrypt/decrypt function.
            // After max 10 hi-optimized functions, we create generic
            // (still very fast.. but not ultra) functions for each $mode/$des_rounds
            // Currently 2 * 5 generic functions will be then max. possible.
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }

        // Is there a re-usable $lambda_functions in there? If not, we have to create it.
        if (!isset($lambda_functions[$code_hash])) {
            // Init code for both, encrypt and decrypt.
            $init_crypt = 'static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
                if (!$sbox1) {
                    $sbox1 = array_map("intval", $self->sbox1);
                    $sbox2 = array_map("intval", $self->sbox2);
                    $sbox3 = array_map("intval", $self->sbox3);
                    $sbox4 = array_map("intval", $self->sbox4);
                    $sbox5 = array_map("intval", $self->sbox5);
                    $sbox6 = array_map("intval", $self->sbox6);
                    $sbox7 = array_map("intval", $self->sbox7);
                    $sbox8 = array_map("intval", $self->sbox8);'
                    /* Merge $shuffle with $[inv]ipmap */ . '
                    for ($i = 0; $i < 256; ++$i) {
                        $shuffleip[]    =  $self->shuffle[$self->ipmap[$i]];
                        $shuffleinvip[] =  $self->shuffle[$self->invipmap[$i]];
                    }
                }
            ';

            switch (true) {
                case $gen_hi_opt_code:
                    // In Hi-optimized code mode, we use our [3]DES key schedule as hardcoded integers.
                    // No futher initialisation of the $keys schedule is necessary.
                    // That is the extra performance boost.
                    $k = array(
                        CRYPT_DES_ENCRYPT => $this->keys[CRYPT_DES_ENCRYPT],
                        CRYPT_DES_DECRYPT => $this->keys[CRYPT_DES_DECRYPT]
                    );
                    $init_encrypt = '';
                    $init_decrypt = '';
                    break;
                default:
                    // In generic optimized code mode, we have to use, as the best compromise [currently],
                    // our key schedule as $ke/$kd arrays. (with hardcoded indexes...)
                    $k = array(
                        CRYPT_DES_ENCRYPT => array(),
                        CRYPT_DES_DECRYPT => array()
                    );
                    for ($i = 0, $c = count($this->keys[CRYPT_DES_ENCRYPT]); $i < $c; ++$i) {
                        $k[CRYPT_DES_ENCRYPT][$i] = '$ke[' . $i . ']';
                        $k[CRYPT_DES_DECRYPT][$i] = '$kd[' . $i . ']';
                    }
                    $init_encrypt = '$ke = $self->keys[CRYPT_DES_ENCRYPT];';
                    $init_decrypt = '$kd = $self->keys[CRYPT_DES_DECRYPT];';
                    break;
            }

            // Creating code for en- and decryption.
            $crypt_block = array();
            foreach (array(CRYPT_DES_ENCRYPT, CRYPT_DES_DECRYPT) as $c) {
                /* Do the initial IP permutation. */
                $crypt_block[$c] = '
                    $in = unpack("N*", $in);
                    $l  = $in[1];
                    $r  = $in[2];
                    $in = unpack("N*",
                        ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                        ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                        ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                        ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                        ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                        ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                        ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                        ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01")
                    );
                    ' . /* Extract L0 and R0 */ '
                    $l = $in[1];
                    $r = $in[2];
                ';

                $l = '$l';
                $r = '$r';

                // Perform DES or 3DES.
                for ($ki = -1, $des_round = 0; $des_round < $des_rounds; ++$des_round) {
                    // Perform the 16 steps.
                    for ($i = 0; $i < 16; ++$i) {
                        // start of "the Feistel (F) function" - see the following URL:
                        // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
                        // Merge key schedule.
                        $crypt_block[$c].= '
                            $b1 = ((' . $r . ' >>  3) & 0x1FFFFFFF)  ^ (' . $r . ' << 29) ^ ' . $k[$c][++$ki] . ';
                            $b2 = ((' . $r . ' >> 31) & 0x00000001)  ^ (' . $r . ' <<  1) ^ ' . $k[$c][++$ki] . ';' .
                            /* S-box indexing. */
                            $l . ' = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
                                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
                                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
                                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ ' . $l . ';
                        ';
                        // end of "the Feistel (F) function"

                        // swap L & R
                        list($l, $r) = array($r, $l);
                    }
                    list($l, $r) = array($r, $l);
                }

                // Perform the inverse IP permutation.
                $crypt_block[$c].= '$in =
                    ($shuffleinvip[($l >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                    ($shuffleinvip[($r >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                    ($shuffleinvip[($l >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                    ($shuffleinvip[($r >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                    ($shuffleinvip[($l >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                    ($shuffleinvip[($r >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                    ($shuffleinvip[ $l        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                    ($shuffleinvip[ $r        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
                ';
            }

            // Creates the inline-crypt function
            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => $init_crypt,
                   'init_encrypt'  => $init_encrypt,
                   'init_decrypt'  => $init_decrypt,
                   'encrypt_block' => $crypt_block[CRYPT_DES_ENCRYPT],
                   'decrypt_block' => $crypt_block[CRYPT_DES_DECRYPT]
                )
            );
        }

        // Set the inline-crypt function as callback in: $this->inline_crypt
        $this->inline_crypt = $lambda_functions[$code_hash];
    }
}
phpseclib-1.0.18/phpseclib/Crypt/Hash.php000066400000000000000000000745471354156543400202530ustar00rootroot00000000000000
 * setKey('abcdefg');
 *
 *    echo base64_encode($hash->hash('abcdefg'));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_Hash
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * @access private
 * @see self::Crypt_Hash()
 */
/**
 * Toggles the internal implementation
 */
define('CRYPT_HASH_MODE_INTERNAL', 1);
/**
 * Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
 */
define('CRYPT_HASH_MODE_MHASH',    2);
/**
 * Toggles the hash() implementation, which works on PHP 5.1.2+.
 */
define('CRYPT_HASH_MODE_HASH',     3);
/**#@-*/

/**
 * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
 *
 * @package Crypt_Hash
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_Hash
{
    /**
     * Hash Parameter
     *
     * @see self::setHash()
     * @var int
     * @access private
     */
    var $hashParam;

    /**
     * Byte-length of compression blocks / key (Internal HMAC)
     *
     * @see self::setAlgorithm()
     * @var int
     * @access private
     */
    var $b;

    /**
     * Byte-length of hash output (Internal HMAC)
     *
     * @see self::setHash()
     * @var int
     * @access private
     */
    var $l = false;

    /**
     * Hash Algorithm
     *
     * @see self::setHash()
     * @var string
     * @access private
     */
    var $hash;

    /**
     * Key
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key = false;

    /**
     * Computed Key
     *
     * @see self::_computeKey()
     * @var string
     * @access private
     */
    var $computedKey = false;

    /**
     * Outer XOR (Internal HMAC)
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $opad;

    /**
     * Inner XOR (Internal HMAC)
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $ipad;

    /**
     * Engine
     *
     * @see self::setHash()
     * @var string
     * @access private
     */
    var $engine;

    /**
     * Default Constructor.
     *
     * @param string $hash
     * @return Crypt_Hash
     * @access public
     */
    function __construct($hash = 'sha1')
    {
        if (!defined('CRYPT_HASH_MODE')) {
            switch (true) {
                case extension_loaded('hash'):
                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
                    break;
                case extension_loaded('mhash'):
                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
                    break;
                default:
                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
            }
        }

        $this->setHash($hash);
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param int $mode
     * @access public
     */
    function Crypt_Hash($hash = 'sha1')
    {
        $this->__construct($hash);
    }

    /**
     * Sets the key for HMACs
     *
     * Keys can be of any length.
     *
     * @access public
     * @param string $key
     */
    function setKey($key = false)
    {
        $this->key = $key;
        $this->_computeKey();
    }

    /**
     * Pre-compute the key used by the HMAC
     *
     * Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
     * will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
     *
     * As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
     * when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
     * every call
     *
     * @access private
     */
    function _computeKey()
    {
        if ($this->key === false) {
            $this->computedKey = false;
            return;
        }

        if (strlen($this->key) <= $this->b) {
            $this->computedKey = $this->key;
            return;
        }

        switch ($this->engine) {
            case CRYPT_HASH_MODE_MHASH:
                $this->computedKey = mhash($this->hash, $this->key);
                break;
            case CRYPT_HASH_MODE_HASH:
                $this->computedKey = hash($this->hash, $this->key, true);
                break;
            case CRYPT_HASH_MODE_INTERNAL:
                $this->computedKey = call_user_func($this->hash, $this->key);
        }
    }

    /**
     * Gets the hash function.
     *
     * As set by the constructor or by the setHash() method.
     *
     * @access public
     * @return string
     */
    function getHash()
    {
        return $this->hashParam;
    }

    /**
     * Sets the hash function.
     *
     * @access public
     * @param string $hash
     */
    function setHash($hash)
    {
        $this->hashParam = $hash = strtolower($hash);
        switch ($hash) {
            case 'md5-96':
            case 'sha1-96':
            case 'sha256-96':
            case 'sha512-96':
                $hash = substr($hash, 0, -3);
                $this->l = 12; // 96 / 8 = 12
                break;
            case 'md2':
            case 'md5':
                $this->l = 16;
                break;
            case 'sha1':
                $this->l = 20;
                break;
            case 'sha256':
                $this->l = 32;
                break;
            case 'sha384':
                $this->l = 48;
                break;
            case 'sha512':
                $this->l = 64;
        }

        switch ($hash) {
            case 'md2-96':
            case 'md2':
                $this->b = 16;
            case 'md5-96':
            case 'sha1-96':
            case 'sha224-96':
            case 'sha256-96':
            case 'md2':
            case 'md5':
            case 'sha1':
            case 'sha224':
            case 'sha256':
                $this->b = 64;
                break;
            default:
                $this->b = 128;
        }

        switch ($hash) {
            case 'md2':
                $this->engine = CRYPT_HASH_MODE == CRYPT_HASH_MODE_HASH && in_array('md2', hash_algos()) ?
                    CRYPT_HASH_MODE_HASH : CRYPT_HASH_MODE_INTERNAL;
                break;
            case 'sha384':
            case 'sha512':
                $this->engine = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
                break;
            default:
                $this->engine = CRYPT_HASH_MODE;
        }

        switch ($this->engine) {
            case CRYPT_HASH_MODE_MHASH:
                switch ($hash) {
                    case 'md5':
                        $this->hash = MHASH_MD5;
                        break;
                    case 'sha256':
                        $this->hash = MHASH_SHA256;
                        break;
                    case 'sha1':
                    default:
                        $this->hash = MHASH_SHA1;
                }
                $this->_computeKey();
                return;
            case CRYPT_HASH_MODE_HASH:
                switch ($hash) {
                    case 'md5':
                        $this->hash = 'md5';
                        return;
                    case 'md2':
                    case 'sha256':
                    case 'sha384':
                    case 'sha512':
                        $this->hash = $hash;
                        return;
                    case 'sha1':
                    default:
                        $this->hash = 'sha1';
                }
                $this->_computeKey();
                return;
        }

        switch ($hash) {
            case 'md2':
                $this->hash = array($this, '_md2');
                break;
            case 'md5':
                $this->hash = array($this, '_md5');
                break;
            case 'sha256':
                $this->hash = array($this, '_sha256');
                break;
            case 'sha384':
            case 'sha512':
                $this->hash = array($this, '_sha512');
                break;
            case 'sha1':
            default:
                $this->hash = array($this, '_sha1');
        }

        $this->ipad = str_repeat(chr(0x36), $this->b);
        $this->opad = str_repeat(chr(0x5C), $this->b);

        $this->_computeKey();
    }

    /**
     * Compute the HMAC.
     *
     * @access public
     * @param string $text
     * @return string
     */
    function hash($text)
    {
        if (!empty($this->key) || is_string($this->key)) {
            switch ($this->engine) {
                case CRYPT_HASH_MODE_MHASH:
                    $output = mhash($this->hash, $text, $this->computedKey);
                    break;
                case CRYPT_HASH_MODE_HASH:
                    $output = hash_hmac($this->hash, $text, $this->computedKey, true);
                    break;
                case CRYPT_HASH_MODE_INTERNAL:
                    $key    = str_pad($this->computedKey, $this->b, chr(0)); // step 1
                    $temp   = $this->ipad ^ $key;                            // step 2
                    $temp  .= $text;                                         // step 3
                    $temp   = call_user_func($this->hash, $temp);            // step 4
                    $output = $this->opad ^ $key;                            // step 5
                    $output.= $temp;                                         // step 6
                    $output = call_user_func($this->hash, $output);          // step 7
            }
        } else {
            switch ($this->engine) {
                case CRYPT_HASH_MODE_MHASH:
                    $output = mhash($this->hash, $text);
                    break;
                case CRYPT_HASH_MODE_HASH:
                    $output = hash($this->hash, $text, true);
                    break;
                case CRYPT_HASH_MODE_INTERNAL:
                    $output = call_user_func($this->hash, $text);
            }
        }

        return substr($output, 0, $this->l);
    }

    /**
     * Returns the hash length (in bytes)
     *
     * @access public
     * @return int
     */
    function getLength()
    {
        return $this->l;
    }

    /**
     * Wrapper for MD5
     *
     * @access private
     * @param string $m
     */
    function _md5($m)
    {
        return pack('H*', md5($m));
    }

    /**
     * Wrapper for SHA1
     *
     * @access private
     * @param string $m
     */
    function _sha1($m)
    {
        return pack('H*', sha1($m));
    }

    /**
     * Pure-PHP implementation of MD2
     *
     * See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
     *
     * @access private
     * @param string $m
     */
    function _md2($m)
    {
        static $s = array(
             41,  46,  67, 201, 162, 216, 124,   1,  61,  54,  84, 161, 236, 240, 6,
             19,  98, 167,   5, 243, 192, 199, 115, 140, 152, 147,  43, 217, 188,
             76, 130, 202,  30, 155,  87,  60, 253, 212, 224,  22, 103,  66, 111, 24,
            138,  23, 229,  18, 190,  78, 196, 214, 218, 158, 222,  73, 160, 251,
            245, 142, 187,  47, 238, 122, 169, 104, 121, 145,  21, 178,   7,  63,
            148, 194,  16, 137,  11,  34,  95,  33, 128, 127,  93, 154,  90, 144, 50,
             39,  53,  62, 204, 231, 191, 247, 151,   3, 255,  25,  48, 179,  72, 165,
            181, 209, 215,  94, 146,  42, 172,  86, 170, 198,  79, 184,  56, 210,
            150, 164, 125, 182, 118, 252, 107, 226, 156, 116,   4, 241,  69, 157,
            112,  89, 100, 113, 135,  32, 134,  91, 207, 101, 230,  45, 168,   2, 27,
             96,  37, 173, 174, 176, 185, 246,  28,  70,  97, 105,  52,  64, 126, 15,
             85,  71, 163,  35, 221,  81, 175,  58, 195,  92, 249, 206, 186, 197,
            234,  38,  44,  83,  13, 110, 133,  40, 132,   9, 211, 223, 205, 244, 65,
            129,  77,  82, 106, 220,  55, 200, 108, 193, 171, 250,  36, 225, 123,
              8,  12, 189, 177,  74, 120, 136, 149, 139, 227,  99, 232, 109, 233,
            203, 213, 254,  59,   0,  29,  57, 242, 239, 183,  14, 102,  88, 208, 228,
            166, 119, 114, 248, 235, 117,  75,  10,  49,  68,  80, 180, 143, 237,
             31,  26, 219, 153, 141,  51, 159,  17, 131, 20
        );

        // Step 1. Append Padding Bytes
        $pad = 16 - (strlen($m) & 0xF);
        $m.= str_repeat(chr($pad), $pad);

        $length = strlen($m);

        // Step 2. Append Checksum
        $c = str_repeat(chr(0), 16);
        $l = chr(0);
        for ($i = 0; $i < $length; $i+= 16) {
            for ($j = 0; $j < 16; $j++) {
                // RFC1319 incorrectly states that C[j] should be set to S[c xor L]
                //$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
                // per , however, C[j] should be set to S[c xor L] xor C[j]
                $c[$j] = chr($s[ord($m[$i + $j] ^ $l)] ^ ord($c[$j]));
                $l = $c[$j];
            }
        }
        $m.= $c;

        $length+= 16;

        // Step 3. Initialize MD Buffer
        $x = str_repeat(chr(0), 48);

        // Step 4. Process Message in 16-Byte Blocks
        for ($i = 0; $i < $length; $i+= 16) {
            for ($j = 0; $j < 16; $j++) {
                $x[$j + 16] = $m[$i + $j];
                $x[$j + 32] = $x[$j + 16] ^ $x[$j];
            }
            $t = chr(0);
            for ($j = 0; $j < 18; $j++) {
                for ($k = 0; $k < 48; $k++) {
                    $x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
                    //$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
                }
                $t = chr(ord($t) + $j);
            }
        }

        // Step 5. Output
        return substr($x, 0, 16);
    }

    /**
     * Pure-PHP implementation of SHA256
     *
     * See {@link http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}.
     *
     * @access private
     * @param string $m
     */
    function _sha256($m)
    {
        if (extension_loaded('suhosin')) {
            return pack('H*', sha256($m));
        }

        // Initialize variables
        $hash = array(
            0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
        );
        // Initialize table of round constants
        // (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311)
        static $k = array(
            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
        );

        // Pre-processing
        $length = strlen($m);
        // to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64
        $m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
        $m[$length] = chr(0x80);
        // we don't support hashing strings 512MB long
        $m.= pack('N2', 0, $length << 3);

        // Process the message in successive 512-bit chunks
        $chunks = str_split($m, 64);
        foreach ($chunks as $chunk) {
            $w = array();
            for ($i = 0; $i < 16; $i++) {
                extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
                $w[] = $temp;
            }

            // Extend the sixteen 32-bit words into sixty-four 32-bit words
            for ($i = 16; $i < 64; $i++) {
                // @codingStandardsIgnoreStart
                $s0 = $this->_rightRotate($w[$i - 15],  7) ^
                      $this->_rightRotate($w[$i - 15], 18) ^
                      $this->_rightShift( $w[$i - 15],  3);
                $s1 = $this->_rightRotate($w[$i - 2], 17) ^
                      $this->_rightRotate($w[$i - 2], 19) ^
                      $this->_rightShift( $w[$i - 2], 10);
                // @codingStandardsIgnoreEnd
                $w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
            }

            // Initialize hash value for this chunk
            list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;

            // Main loop
            for ($i = 0; $i < 64; $i++) {
                $s0 = $this->_rightRotate($a,  2) ^
                      $this->_rightRotate($a, 13) ^
                      $this->_rightRotate($a, 22);
                $maj = ($a & $b) ^
                       ($a & $c) ^
                       ($b & $c);
                $t2 = $this->_add($s0, $maj);

                $s1 = $this->_rightRotate($e,  6) ^
                      $this->_rightRotate($e, 11) ^
                      $this->_rightRotate($e, 25);
                $ch = ($e & $f) ^
                      ($this->_not($e) & $g);
                $t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);

                $h = $g;
                $g = $f;
                $f = $e;
                $e = $this->_add($d, $t1);
                $d = $c;
                $c = $b;
                $b = $a;
                $a = $this->_add($t1, $t2);
            }

            // Add this chunk's hash to result so far
            $hash = array(
                $this->_add($hash[0], $a),
                $this->_add($hash[1], $b),
                $this->_add($hash[2], $c),
                $this->_add($hash[3], $d),
                $this->_add($hash[4], $e),
                $this->_add($hash[5], $f),
                $this->_add($hash[6], $g),
                $this->_add($hash[7], $h)
            );
        }

        // Produce the final hash value (big-endian)
        return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]);
    }

    /**
     * Pure-PHP implementation of SHA384 and SHA512
     *
     * @access private
     * @param string $m
     */
    function _sha512($m)
    {
        if (!class_exists('Math_BigInteger')) {
            include_once 'Math/BigInteger.php';
        }

        static $init384, $init512, $k;

        if (!isset($k)) {
            // Initialize variables
            $init384 = array( // initial values for SHA384
                'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939',
                '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4'
            );
            $init512 = array( // initial values for SHA512
                '6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1',
                '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179'
            );

            for ($i = 0; $i < 8; $i++) {
                $init384[$i] = new Math_BigInteger($init384[$i], 16);
                $init384[$i]->setPrecision(64);
                $init512[$i] = new Math_BigInteger($init512[$i], 16);
                $init512[$i]->setPrecision(64);
            }

            // Initialize table of round constants
            // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
            $k = array(
                '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
                '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
                'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
                '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
                'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
                '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
                '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
                'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
                '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
                '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
                'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
                'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
                '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
                '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
                '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
                '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
                'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
                '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
                '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
                '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
            );

            for ($i = 0; $i < 80; $i++) {
                $k[$i] = new Math_BigInteger($k[$i], 16);
            }
        }

        $hash = $this->l == 48 ? $init384 : $init512;

        // Pre-processing
        $length = strlen($m);
        // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
        $m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
        $m[$length] = chr(0x80);
        // we don't support hashing strings 512MB long
        $m.= pack('N4', 0, 0, 0, $length << 3);

        // Process the message in successive 1024-bit chunks
        $chunks = str_split($m, 128);
        foreach ($chunks as $chunk) {
            $w = array();
            for ($i = 0; $i < 16; $i++) {
                $temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
                $temp->setPrecision(64);
                $w[] = $temp;
            }

            // Extend the sixteen 32-bit words into eighty 32-bit words
            for ($i = 16; $i < 80; $i++) {
                $temp = array(
                          $w[$i - 15]->bitwise_rightRotate(1),
                          $w[$i - 15]->bitwise_rightRotate(8),
                          $w[$i - 15]->bitwise_rightShift(7)
                );
                $s0 = $temp[0]->bitwise_xor($temp[1]);
                $s0 = $s0->bitwise_xor($temp[2]);
                $temp = array(
                          $w[$i - 2]->bitwise_rightRotate(19),
                          $w[$i - 2]->bitwise_rightRotate(61),
                          $w[$i - 2]->bitwise_rightShift(6)
                );
                $s1 = $temp[0]->bitwise_xor($temp[1]);
                $s1 = $s1->bitwise_xor($temp[2]);
                $w[$i] = $w[$i - 16]->copy();
                $w[$i] = $w[$i]->add($s0);
                $w[$i] = $w[$i]->add($w[$i - 7]);
                $w[$i] = $w[$i]->add($s1);
            }

            // Initialize hash value for this chunk
            $a = $hash[0]->copy();
            $b = $hash[1]->copy();
            $c = $hash[2]->copy();
            $d = $hash[3]->copy();
            $e = $hash[4]->copy();
            $f = $hash[5]->copy();
            $g = $hash[6]->copy();
            $h = $hash[7]->copy();

            // Main loop
            for ($i = 0; $i < 80; $i++) {
                $temp = array(
                    $a->bitwise_rightRotate(28),
                    $a->bitwise_rightRotate(34),
                    $a->bitwise_rightRotate(39)
                );
                $s0 = $temp[0]->bitwise_xor($temp[1]);
                $s0 = $s0->bitwise_xor($temp[2]);
                $temp = array(
                    $a->bitwise_and($b),
                    $a->bitwise_and($c),
                    $b->bitwise_and($c)
                );
                $maj = $temp[0]->bitwise_xor($temp[1]);
                $maj = $maj->bitwise_xor($temp[2]);
                $t2 = $s0->add($maj);

                $temp = array(
                    $e->bitwise_rightRotate(14),
                    $e->bitwise_rightRotate(18),
                    $e->bitwise_rightRotate(41)
                );
                $s1 = $temp[0]->bitwise_xor($temp[1]);
                $s1 = $s1->bitwise_xor($temp[2]);
                $temp = array(
                    $e->bitwise_and($f),
                    $g->bitwise_and($e->bitwise_not())
                );
                $ch = $temp[0]->bitwise_xor($temp[1]);
                $t1 = $h->add($s1);
                $t1 = $t1->add($ch);
                $t1 = $t1->add($k[$i]);
                $t1 = $t1->add($w[$i]);

                $h = $g->copy();
                $g = $f->copy();
                $f = $e->copy();
                $e = $d->add($t1);
                $d = $c->copy();
                $c = $b->copy();
                $b = $a->copy();
                $a = $t1->add($t2);
            }

            // Add this chunk's hash to result so far
            $hash = array(
                $hash[0]->add($a),
                $hash[1]->add($b),
                $hash[2]->add($c),
                $hash[3]->add($d),
                $hash[4]->add($e),
                $hash[5]->add($f),
                $hash[6]->add($g),
                $hash[7]->add($h)
            );
        }

        // Produce the final hash value (big-endian)
        // (Crypt_Hash::hash() trims the output for hashes but not for HMACs.  as such, we trim the output here)
        $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
                $hash[4]->toBytes() . $hash[5]->toBytes();
        if ($this->l != 48) {
            $temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
        }

        return $temp;
    }

    /**
     * Right Rotate
     *
     * @access private
     * @param int $int
     * @param int $amt
     * @see self::_sha256()
     * @return int
     */
    function _rightRotate($int, $amt)
    {
        $invamt = 32 - $amt;
        $mask = (1 << $invamt) - 1;
        return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask);
    }

    /**
     * Right Shift
     *
     * @access private
     * @param int $int
     * @param int $amt
     * @see self::_sha256()
     * @return int
     */
    function _rightShift($int, $amt)
    {
        $mask = (1 << (32 - $amt)) - 1;
        return ($int >> $amt) & $mask;
    }

    /**
     * Not
     *
     * @access private
     * @param int $int
     * @see self::_sha256()
     * @return int
     */
    function _not($int)
    {
        return ~$int & 0xFFFFFFFF;
    }

    /**
     * Add
     *
     * _sha256() adds multiple unsigned 32-bit integers.  Since PHP doesn't support unsigned integers and since the
     * possibility of overflow exists, care has to be taken.  Math_BigInteger() could be used but this should be faster.
     *
     * @param int $...
     * @return int
     * @see self::_sha256()
     * @access private
     */
    function _add()
    {
        static $mod;
        if (!isset($mod)) {
            $mod = pow(2, 32);
        }

        $result = 0;
        $arguments = func_get_args();
        foreach ($arguments as $argument) {
            $result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument;
        }

        switch (true) {
            case is_int($result):
            // PHP 5.3, per http://php.net/releases/5_3_0.php, introduced "more consistent float rounding"
            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
            // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
                return fmod($result, $mod);
        }

        return (fmod($result, 0x80000000) & 0x7FFFFFFF) |
            ((fmod(floor($result / 0x80000000), 2) & 1) << 31);
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }
}
phpseclib-1.0.18/phpseclib/Crypt/RC2.php000066400000000000000000000604701354156543400177440ustar00rootroot00000000000000
 * setKey('abcdefgh');
 *
 *    $plaintext = str_repeat('a', 1024);
 *
 *    echo $rc2->decrypt($rc2->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category Crypt
 * @package  Crypt_RC2
 * @author   Patrick Monnerat 
 * @license  http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link     http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_RC2_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_RC2_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_RC2_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_RC2_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_RC2_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of RC2.
 *
 * @package Crypt_RC2
 * @access  public
 */
class Crypt_RC2 extends Crypt_Base
{
    /**
     * Block Length of the cipher
     *
     * @see Crypt_Base::block_size
     * @var int
     * @access private
     */
    var $block_size = 8;

    /**
     * The Key
     *
     * @see Crypt_Base::key
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key;

    /**
     * The Original (unpadded) Key
     *
     * @see Crypt_Base::key
     * @see self::setKey()
     * @see self::encrypt()
     * @see self::decrypt()
     * @var string
     * @access private
     */
    var $orig_key;

    /**
     * Don't truncate / null pad key
     *
     * @see Crypt_Base::_clearBuffers()
     * @var bool
     * @access private
     */
    var $skip_key_adjustment = true;

    /**
     * Key Length (in bytes)
     *
     * @see Crypt_RC2::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 16; // = 128 bits

    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'RC2';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'rc2';

    /**
     * Optimizing value while CFB-encrypting
     *
     * @see Crypt_Base::cfb_init_len
     * @var int
     * @access private
     */
    var $cfb_init_len = 500;

    /**
     * The key length in bits.
     *
     * @see self::setKeyLength()
     * @see self::setKey()
     * @var int
     * @access private
     * @internal Should be in range [1..1024].
     * @internal Changing this value after setting the key has no effect.
     */
    var $default_key_length = 1024;

    /**
     * The key length in bits.
     *
     * @see self::isValidEnine()
     * @see self::setKey()
     * @var int
     * @access private
     * @internal Should be in range [1..1024].
     */
    var $current_key_length;

    /**
     * The Key Schedule
     *
     * @see self::_setupKey()
     * @var array
     * @access private
     */
    var $keys;

    /**
     * Key expansion randomization table.
     * Twice the same 256-value sequence to save a modulus in key expansion.
     *
     * @see self::setKey()
     * @var array
     * @access private
     */
    var $pitable = array(
        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD,
        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD
    );

    /**
     * Inverse key expansion randomization table.
     *
     * @see self::setKey()
     * @var array
     * @access private
     */
    var $invpitable = array(
        0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66,
        0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4,
        0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20,
        0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53,
        0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68,
        0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B,
        0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12,
        0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB,
        0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3,
        0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26,
        0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67,
        0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB,
        0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC,
        0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60,
        0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7,
        0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD,
        0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24,
        0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31,
        0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE,
        0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99,
        0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C,
        0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA,
        0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35,
        0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61,
        0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72,
        0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3,
        0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F,
        0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9,
        0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77,
        0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75,
        0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87,
        0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6
    );

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::Crypt_Base()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        switch ($engine) {
            case CRYPT_ENGINE_OPENSSL:
                if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) {
                    return false;
                }
                $this->cipher_name_openssl_ecb = 'rc2-ecb';
                $this->cipher_name_openssl = 'rc2-' . $this->_openssl_translate_mode();
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Sets the key length.
     *
     * Valid key lengths are 8 to 1024.
     * Calling this function after setting the key has no effect until the next
     *  Crypt_RC2::setKey() call.
     *
     * @access public
     * @param int $length in bits
     */
    function setKeyLength($length)
    {
        if ($length < 8) {
            $this->default_key_length = 1;
        } elseif ($length > 1024) {
            $this->default_key_length = 128;
        } else {
            $this->default_key_length = $length;
        }
        $this->current_key_length = $this->default_key_length;

        parent::setKeyLength($length);
    }

    /**
     * Returns the current key length
     *
     * @access public
     * @return int
     */
    function getKeyLength()
    {
        return $this->current_key_length;
    }

    /**
     * Sets the key.
     *
     * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg.
     * strlen($key) <= 128), however, we only use the first 128 bytes if $key
     * has more then 128 bytes in it, and set $key to a single null byte if
     * it is empty.
     *
     * If the key is not explicitly set, it'll be assumed to be a single
     * null byte.
     *
     * @see Crypt_Base::setKey()
     * @access public
     * @param string $key
     * @param int $t1 optional Effective key length in bits.
     */
    function setKey($key, $t1 = 0)
    {
        $this->orig_key = $key;

        if ($t1 <= 0) {
            $t1 = $this->default_key_length;
        } elseif ($t1 > 1024) {
            $t1 = 1024;
        }
        $this->current_key_length = $t1;
        // Key byte count should be 1..128.
        $key = strlen($key) ? substr($key, 0, 128) : "\x00";
        $t = strlen($key);

        // The mcrypt RC2 implementation only supports effective key length
        // of 1024 bits. It is however possible to handle effective key
        // lengths in range 1..1024 by expanding the key and applying
        // inverse pitable mapping to the first byte before submitting it
        // to mcrypt.

        // Key expansion.
        $l = array_values(unpack('C*', $key));
        $t8 = ($t1 + 7) >> 3;
        $tm = 0xFF >> (8 * $t8 - $t1);

        // Expand key.
        $pitable = $this->pitable;
        for ($i = $t; $i < 128; $i++) {
            $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]];
        }
        $i = 128 - $t8;
        $l[$i] = $pitable[$l[$i] & $tm];
        while ($i--) {
            $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]];
        }

        // Prepare the key for mcrypt.
        $l[0] = $this->invpitable[$l[0]];
        array_unshift($l, 'C*');

        parent::setKey(call_user_func_array('pack', $l));
    }

    /**
     * Encrypts a message.
     *
     * Mostly a wrapper for Crypt_Base::encrypt, with some additional OpenSSL handling code
     *
     * @see self::decrypt()
     * @access public
     * @param string $plaintext
     * @return string $ciphertext
     */
    function encrypt($plaintext)
    {
        if ($this->engine == CRYPT_ENGINE_OPENSSL) {
            $temp = $this->key;
            $this->key = $this->orig_key;
            $result = parent::encrypt($plaintext);
            $this->key = $temp;
            return $result;
        }

        return parent::encrypt($plaintext);
    }

    /**
     * Decrypts a message.
     *
     * Mostly a wrapper for Crypt_Base::decrypt, with some additional OpenSSL handling code
     *
     * @see self::encrypt()
     * @access public
     * @param string $ciphertext
     * @return string $plaintext
     */
    function decrypt($ciphertext)
    {
        if ($this->engine == CRYPT_ENGINE_OPENSSL) {
            $temp = $this->key;
            $this->key = $this->orig_key;
            $result = parent::decrypt($ciphertext);
            $this->key = $temp;
            return $result;
        }

        return parent::decrypt($ciphertext);
    }

    /**
     * Encrypts a block
     *
     * @see Crypt_Base::_encryptBlock()
     * @see Crypt_Base::encrypt()
     * @access private
     * @param string $in
     * @return string
     */
    function _encryptBlock($in)
    {
        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
        $keys = $this->keys;
        $limit = 20;
        $actions = array($limit => 44, 44 => 64);
        $j = 0;

        for (;;) {
            // Mixing round.
            $r0 = (($r0 + $keys[$j++] + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
            $r0 |= $r0 >> 16;
            $r1 = (($r1 + $keys[$j++] + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
            $r1 |= $r1 >> 16;
            $r2 = (($r2 + $keys[$j++] + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
            $r2 |= $r2 >> 16;
            $r3 = (($r3 + $keys[$j++] + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
            $r3 |= $r3 >> 16;

            if ($j === $limit) {
                if ($limit === 64) {
                    break;
                }

                // Mashing round.
                $r0 += $keys[$r3 & 0x3F];
                $r1 += $keys[$r0 & 0x3F];
                $r2 += $keys[$r1 & 0x3F];
                $r3 += $keys[$r2 & 0x3F];
                $limit = $actions[$limit];
            }
        }

        return pack('vvvv', $r0, $r1, $r2, $r3);
    }

    /**
     * Decrypts a block
     *
     * @see Crypt_Base::_decryptBlock()
     * @see Crypt_Base::decrypt()
     * @access private
     * @param string $in
     * @return string
     */
    function _decryptBlock($in)
    {
        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
        $keys = $this->keys;
        $limit = 44;
        $actions = array($limit => 20, 20 => 0);
        $j = 64;

        for (;;) {
            // R-mixing round.
            $r3 = ($r3 | ($r3 << 16)) >> 5;
            $r3 = ($r3 - $keys[--$j] - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
            $r2 = ($r2 | ($r2 << 16)) >> 3;
            $r2 = ($r2 - $keys[--$j] - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
            $r1 = ($r1 | ($r1 << 16)) >> 2;
            $r1 = ($r1 - $keys[--$j] - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
            $r0 = ($r0 | ($r0 << 16)) >> 1;
            $r0 = ($r0 - $keys[--$j] - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;

            if ($j === $limit) {
                if ($limit === 0) {
                    break;
                }

                // R-mashing round.
                $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
                $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
                $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
                $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;
                $limit = $actions[$limit];
            }
        }

        return pack('vvvv', $r0, $r1, $r2, $r3);
    }

    /**
     * Setup the CRYPT_ENGINE_MCRYPT $engine
     *
     * @see Crypt_Base::_setupMcrypt()
     * @access private
     */
    function _setupMcrypt()
    {
        if (!isset($this->key)) {
            $this->setKey('');
        }

        parent::_setupMcrypt();
    }

    /**
     * Creates the key schedule
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        if (!isset($this->key)) {
            $this->setKey('');
        }

        // Key has already been expanded in Crypt_RC2::setKey():
        // Only the first value must be altered.
        $l = unpack('Ca/Cb/v*', $this->key);
        array_unshift($l, $this->pitable[$l['a']] | ($l['b'] << 8));
        unset($l['a']);
        unset($l['b']);
        $this->keys = $l;
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * @see Crypt_Base::_setupInlineCrypt()
     * @access private
     */
    function _setupInlineCrypt()
    {
        $lambda_functions = &Crypt_RC2::_getLambdaFunctions();

        // The first 10 generated $lambda_functions will use the $keys hardcoded as integers
        // for the mixing rounds, for better inline crypt performance [~20% faster].
        // But for memory reason we have to limit those ultra-optimized $lambda_functions to an amount of 10.
        // (Currently, for Crypt_RC2, one generated $lambda_function cost on php5.5@32bit ~60kb unfreeable mem and ~100kb on php5.5@64bit)
        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);

        // Generation of a unique hash for our generated code
        $code_hash = "Crypt_RC2, {$this->mode}";
        if ($gen_hi_opt_code) {
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }

        // Is there a re-usable $lambda_functions in there?
        // If not, we have to create it.
        if (!isset($lambda_functions[$code_hash])) {
            // Init code for both, encrypt and decrypt.
            $init_crypt = '$keys = $self->keys;';

            switch (true) {
                case $gen_hi_opt_code:
                    $keys = $this->keys;
                default:
                    $keys = array();
                    foreach ($this->keys as $k => $v) {
                        $keys[$k] = '$keys[' . $k . ']';
                    }
            }

            // $in is the current 8 bytes block which has to be en/decrypt
            $encrypt_block = $decrypt_block = '
                $in = unpack("v4", $in);
                $r0 = $in[1];
                $r1 = $in[2];
                $r2 = $in[3];
                $r3 = $in[4];
            ';

            // Create code for encryption.
            $limit = 20;
            $actions = array($limit => 44, 44 => 64);
            $j = 0;

            for (;;) {
                // Mixing round.
                $encrypt_block .= '
                    $r0 = (($r0 + ' . $keys[$j++] . ' +
                           ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
                    $r0 |= $r0 >> 16;
                    $r1 = (($r1 + ' . $keys[$j++] . ' +
                           ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
                    $r1 |= $r1 >> 16;
                    $r2 = (($r2 + ' . $keys[$j++] . ' +
                           ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
                    $r2 |= $r2 >> 16;
                    $r3 = (($r3 + ' . $keys[$j++] . ' +
                           ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
                    $r3 |= $r3 >> 16;';

                if ($j === $limit) {
                    if ($limit === 64) {
                        break;
                    }

                    // Mashing round.
                    $encrypt_block .= '
                        $r0 += $keys[$r3 & 0x3F];
                        $r1 += $keys[$r0 & 0x3F];
                        $r2 += $keys[$r1 & 0x3F];
                        $r3 += $keys[$r2 & 0x3F];';
                    $limit = $actions[$limit];
                }
            }

            $encrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';

            // Create code for decryption.
            $limit = 44;
            $actions = array($limit => 20, 20 => 0);
            $j = 64;

            for (;;) {
                // R-mixing round.
                $decrypt_block .= '
                    $r3 = ($r3 | ($r3 << 16)) >> 5;
                    $r3 = ($r3 - ' . $keys[--$j] . ' -
                           ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
                    $r2 = ($r2 | ($r2 << 16)) >> 3;
                    $r2 = ($r2 - ' . $keys[--$j] . ' -
                           ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
                    $r1 = ($r1 | ($r1 << 16)) >> 2;
                    $r1 = ($r1 - ' . $keys[--$j] . ' -
                           ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
                    $r0 = ($r0 | ($r0 << 16)) >> 1;
                    $r0 = ($r0 - ' . $keys[--$j] . ' -
                           ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;';

                if ($j === $limit) {
                    if ($limit === 0) {
                        break;
                    }

                    // R-mashing round.
                    $decrypt_block .= '
                        $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
                        $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
                        $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
                        $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;';
                    $limit = $actions[$limit];
                }
            }

            $decrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';

            // Creates the inline-crypt function
            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => $init_crypt,
                   'encrypt_block' => $encrypt_block,
                   'decrypt_block' => $decrypt_block
                )
            );
        }

        // Set the inline-crypt function as callback in: $this->inline_crypt
        $this->inline_crypt = $lambda_functions[$code_hash];
    }
}
phpseclib-1.0.18/phpseclib/Crypt/RC4.php000066400000000000000000000231621354156543400177430ustar00rootroot00000000000000
 * setKey('abcdefgh');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $rc4->decrypt($rc4->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_RC4
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access private
 * @see self::_crypt()
 */
define('CRYPT_RC4_ENCRYPT', 0);
define('CRYPT_RC4_DECRYPT', 1);
/**#@-*/

/**
 * Pure-PHP implementation of RC4.
 *
 * @package Crypt_RC4
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_RC4 extends Crypt_Base
{
    /**
     * Block Length of the cipher
     *
     * RC4 is a stream cipher
     * so we the block_size to 0
     *
     * @see Crypt_Base::block_size
     * @var int
     * @access private
     */
    var $block_size = 0;

    /**
     * Key Length (in bytes)
     *
     * @see Crypt_RC4::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 128; // = 1024 bits

    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'RC4';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'arcfour';

    /**
     * Holds whether performance-optimized $inline_crypt() can/should be used.
     *
     * @see Crypt_Base::inline_crypt
     * @var mixed
     * @access private
     */
    var $use_inline_crypt = false; // currently not available

    /**
     * The Key
     *
     * @see self::setKey()
     * @var string
     * @access private
     */
    var $key;

    /**
     * The Key Stream for decryption and encryption
     *
     * @see self::setKey()
     * @var array
     * @access private
     */
    var $stream;

    /**
     * Default Constructor.
     *
     * Determines whether or not the mcrypt extension should be used.
     *
     * @see Crypt_Base::Crypt_Base()
     * @return Crypt_RC4
     * @access public
     */
    function __construct()
    {
        parent::__construct(CRYPT_MODE_STREAM);
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function Crypt_RC4()
    {
        $this->__construct();
    }

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::Crypt_Base()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        if ($engine == CRYPT_ENGINE_OPENSSL) {
            if (version_compare(PHP_VERSION, '5.3.7') >= 0) {
                $this->cipher_name_openssl = 'rc4-40';
            } else {
                switch (strlen($this->key)) {
                    case 5:
                        $this->cipher_name_openssl = 'rc4-40';
                        break;
                    case 8:
                        $this->cipher_name_openssl = 'rc4-64';
                        break;
                    case 16:
                        $this->cipher_name_openssl = 'rc4';
                        break;
                    default:
                        return false;
                }
            }
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Dummy function.
     *
     * Some protocols, such as WEP, prepend an "initialization vector" to the key, effectively creating a new key [1].
     * If you need to use an initialization vector in this manner, feel free to prepend it to the key, yourself, before
     * calling setKey().
     *
     * [1] WEP's initialization vectors (IV's) are used in a somewhat insecure way.  Since, in that protocol,
     * the IV's are relatively easy to predict, an attack described by
     * {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott Fluhrer, Itsik Mantin, and Adi Shamir}
     * can be used to quickly guess at the rest of the key.  The following links elaborate:
     *
     * {@link http://www.rsa.com/rsalabs/node.asp?id=2009 http://www.rsa.com/rsalabs/node.asp?id=2009}
     * {@link http://en.wikipedia.org/wiki/Related_key_attack http://en.wikipedia.org/wiki/Related_key_attack}
     *
     * @param string $iv
     * @see self::setKey()
     * @access public
     */
    function setIV($iv)
    {
    }

    /**
     * Sets the key length
     *
     * Keys can be between 1 and 256 bytes long.
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        if ($length < 8) {
            $this->key_length = 1;
        } elseif ($length > 2048) {
            $this->key_length = 256;
        } else {
            $this->key_length = $length >> 3;
        }

        parent::setKeyLength($length);
    }

    /**
     * Encrypts a message.
     *
     * @see Crypt_Base::decrypt()
     * @see self::_crypt()
     * @access public
     * @param string $plaintext
     * @return string $ciphertext
     */
    function encrypt($plaintext)
    {
        if ($this->engine != CRYPT_ENGINE_INTERNAL) {
            return parent::encrypt($plaintext);
        }
        return $this->_crypt($plaintext, CRYPT_RC4_ENCRYPT);
    }

    /**
     * Decrypts a message.
     *
     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
     * At least if the continuous buffer is disabled.
     *
     * @see Crypt_Base::encrypt()
     * @see self::_crypt()
     * @access public
     * @param string $ciphertext
     * @return string $plaintext
     */
    function decrypt($ciphertext)
    {
        if ($this->engine != CRYPT_ENGINE_INTERNAL) {
            return parent::decrypt($ciphertext);
        }
        return $this->_crypt($ciphertext, CRYPT_RC4_DECRYPT);
    }


    /**
     * Setup the key (expansion)
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        $key = $this->key;
        $keyLength = strlen($key);
        $keyStream = range(0, 255);
        $j = 0;
        for ($i = 0; $i < 256; $i++) {
            $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
            $temp = $keyStream[$i];
            $keyStream[$i] = $keyStream[$j];
            $keyStream[$j] = $temp;
        }

        $this->stream = array();
        $this->stream[CRYPT_RC4_DECRYPT] = $this->stream[CRYPT_RC4_ENCRYPT] = array(
            0, // index $i
            0, // index $j
            $keyStream
        );
    }

    /**
     * Encrypts or decrypts a message.
     *
     * @see self::encrypt()
     * @see self::decrypt()
     * @access private
     * @param string $text
     * @param int $mode
     * @return string $text
     */
    function _crypt($text, $mode)
    {
        if ($this->changed) {
            $this->_setup();
            $this->changed = false;
        }

        $stream = &$this->stream[$mode];
        if ($this->continuousBuffer) {
            $i = &$stream[0];
            $j = &$stream[1];
            $keyStream = &$stream[2];
        } else {
            $i = $stream[0];
            $j = $stream[1];
            $keyStream = $stream[2];
        }

        $len = strlen($text);
        for ($k = 0; $k < $len; ++$k) {
            $i = ($i + 1) & 255;
            $ksi = $keyStream[$i];
            $j = ($j + $ksi) & 255;
            $ksj = $keyStream[$j];

            $keyStream[$i] = $ksj;
            $keyStream[$j] = $ksi;
            $text[$k] = $text[$k] ^ chr($keyStream[($ksj + $ksi) & 255]);
        }

        return $text;
    }
}
phpseclib-1.0.18/phpseclib/Crypt/RSA.php000066400000000000000000003416601354156543400200060ustar00rootroot00000000000000
 * createKey());
 *
 *    $plaintext = 'terrafrost';
 *
 *    $rsa->loadKey($privatekey);
 *    $ciphertext = $rsa->encrypt($plaintext);
 *
 *    $rsa->loadKey($publickey);
 *    echo $rsa->decrypt($ciphertext);
 * ?>
 * 
 *
 * Here's an example of how to create signatures and verify signatures with this library:
 * 
 * createKey());
 *
 *    $plaintext = 'terrafrost';
 *
 *    $rsa->loadKey($privatekey);
 *    $signature = $rsa->sign($plaintext);
 *
 *    $rsa->loadKey($publickey);
 *    echo $rsa->verify($plaintext, $signature) ? 'verified' : 'unverified';
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_RSA
 * @author    Jim Wigginton 
 * @copyright 2009 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Random
 */
// the class_exists() will only be called if the crypt_random_string function hasn't been defined and
// will trigger a call to __autoload() if you're wanting to auto-load classes
// call function_exists() a second time to stop the include_once from being called outside
// of the auto loader
if (!function_exists('crypt_random_string')) {
    include_once 'Random.php';
}

/**
 * Include Crypt_Hash
 */
if (!class_exists('Crypt_Hash')) {
    include_once 'Hash.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Use {@link http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding Optimal Asymmetric Encryption Padding}
 * (OAEP) for encryption / decryption.
 *
 * Uses sha1 by default.
 *
 * @see self::setHash()
 * @see self::setMGFHash()
 */
define('CRYPT_RSA_ENCRYPTION_OAEP',  1);
/**
 * Use PKCS#1 padding.
 *
 * Although CRYPT_RSA_ENCRYPTION_OAEP offers more security, including PKCS#1 padding is necessary for purposes of backwards
 * compatibility with protocols (like SSH-1) written before OAEP's introduction.
 */
define('CRYPT_RSA_ENCRYPTION_PKCS1', 2);
/**
 * Do not use any padding
 *
 * Although this method is not recommended it can none-the-less sometimes be useful if you're trying to decrypt some legacy
 * stuff, if you're trying to diagnose why an encrypted message isn't decrypting, etc.
 */
define('CRYPT_RSA_ENCRYPTION_NONE', 3);
/**#@-*/

/**#@+
 * @access public
 * @see self::sign()
 * @see self::verify()
 * @see self::setHash()
 */
/**
 * Use the Probabilistic Signature Scheme for signing
 *
 * Uses sha1 by default.
 *
 * @see self::setSaltLength()
 * @see self::setMGFHash()
 */
define('CRYPT_RSA_SIGNATURE_PSS',  1);
/**
 * Use the PKCS#1 scheme by default.
 *
 * Although CRYPT_RSA_SIGNATURE_PSS offers more security, including PKCS#1 signing is necessary for purposes of backwards
 * compatibility with protocols (like SSH-2) written before PSS's introduction.
 */
define('CRYPT_RSA_SIGNATURE_PKCS1', 2);
/**#@-*/

/**#@+
 * @access private
 * @see self::createKey()
 */
/**
 * ASN1 Integer
 */
define('CRYPT_RSA_ASN1_INTEGER',     2);
/**
 * ASN1 Bit String
 */
define('CRYPT_RSA_ASN1_BITSTRING',   3);
/**
 * ASN1 Octet String
 */
define('CRYPT_RSA_ASN1_OCTETSTRING', 4);
/**
 * ASN1 Object Identifier
 */
define('CRYPT_RSA_ASN1_OBJECT',      6);
/**
 * ASN1 Sequence (with the constucted bit set)
 */
define('CRYPT_RSA_ASN1_SEQUENCE',   48);
/**#@-*/

/**#@+
 * @access private
 * @see self::Crypt_RSA()
 */
/**
 * To use the pure-PHP implementation
 */
define('CRYPT_RSA_MODE_INTERNAL', 1);
/**
 * To use the OpenSSL library
 *
 * (if enabled; otherwise, the internal implementation will be used)
 */
define('CRYPT_RSA_MODE_OPENSSL', 2);
/**#@-*/

/**
 * Default openSSL configuration file.
 */
define('CRYPT_RSA_OPENSSL_CONFIG', dirname(__FILE__) . '/../openssl.cnf');

/**#@+
 * @access public
 * @see self::createKey()
 * @see self::setPrivateKeyFormat()
 */
/**
 * PKCS#1 formatted private key
 *
 * Used by OpenSSH
 */
define('CRYPT_RSA_PRIVATE_FORMAT_PKCS1', 0);
/**
 * PuTTY formatted private key
 */
define('CRYPT_RSA_PRIVATE_FORMAT_PUTTY', 1);
/**
 * XML formatted private key
 */
define('CRYPT_RSA_PRIVATE_FORMAT_XML', 2);
/**
 * PKCS#8 formatted private key
 */
define('CRYPT_RSA_PRIVATE_FORMAT_PKCS8', 8);
/**
 * OpenSSH formatted private key
 */
define('CRYPT_RSA_PRIVATE_FORMAT_OPENSSH', 9);
/**#@-*/

/**#@+
 * @access public
 * @see self::createKey()
 * @see self::setPublicKeyFormat()
 */
/**
 * Raw public key
 *
 * An array containing two Math_BigInteger objects.
 *
 * The exponent can be indexed with any of the following:
 *
 * 0, e, exponent, publicExponent
 *
 * The modulus can be indexed with any of the following:
 *
 * 1, n, modulo, modulus
 */
define('CRYPT_RSA_PUBLIC_FORMAT_RAW', 3);
/**
 * PKCS#1 formatted public key (raw)
 *
 * Used by File/X509.php
 *
 * Has the following header:
 *
 * -----BEGIN RSA PUBLIC KEY-----
 *
 * Analogous to ssh-keygen's pem format (as specified by -m)
 */
define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1', 4);
define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW', 4);
/**
 * XML formatted public key
 */
define('CRYPT_RSA_PUBLIC_FORMAT_XML', 5);
/**
 * OpenSSH formatted public key
 *
 * Place in $HOME/.ssh/authorized_keys
 */
define('CRYPT_RSA_PUBLIC_FORMAT_OPENSSH', 6);
/**
 * PKCS#1 formatted public key (encapsulated)
 *
 * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
 *
 * Has the following header:
 *
 * -----BEGIN PUBLIC KEY-----
 *
 * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
 * is specific to private keys it's basically creating a DER-encoded wrapper
 * for keys. This just extends that same concept to public keys (much like ssh-keygen)
 */
define('CRYPT_RSA_PUBLIC_FORMAT_PKCS8', 7);
/**#@-*/

/**
 * Pure-PHP PKCS#1 compliant implementation of RSA.
 *
 * @package Crypt_RSA
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_RSA
{
    /**
     * Precomputed Zero
     *
     * @var Math_BigInteger
     * @access private
     */
    var $zero;

    /**
     * Precomputed One
     *
     * @var Math_BigInteger
     * @access private
     */
    var $one;

    /**
     * Private Key Format
     *
     * @var int
     * @access private
     */
    var $privateKeyFormat = CRYPT_RSA_PRIVATE_FORMAT_PKCS1;

    /**
     * Public Key Format
     *
     * @var int
     * @access public
     */
    var $publicKeyFormat = CRYPT_RSA_PUBLIC_FORMAT_PKCS8;

    /**
     * Modulus (ie. n)
     *
     * @var Math_BigInteger
     * @access private
     */
    var $modulus;

    /**
     * Modulus length
     *
     * @var Math_BigInteger
     * @access private
     */
    var $k;

    /**
     * Exponent (ie. e or d)
     *
     * @var Math_BigInteger
     * @access private
     */
    var $exponent;

    /**
     * Primes for Chinese Remainder Theorem (ie. p and q)
     *
     * @var array
     * @access private
     */
    var $primes;

    /**
     * Exponents for Chinese Remainder Theorem (ie. dP and dQ)
     *
     * @var array
     * @access private
     */
    var $exponents;

    /**
     * Coefficients for Chinese Remainder Theorem (ie. qInv)
     *
     * @var array
     * @access private
     */
    var $coefficients;

    /**
     * Hash name
     *
     * @var string
     * @access private
     */
    var $hashName;

    /**
     * Hash function
     *
     * @var Crypt_Hash
     * @access private
     */
    var $hash;

    /**
     * Length of hash function output
     *
     * @var int
     * @access private
     */
    var $hLen;

    /**
     * Length of salt
     *
     * @var int
     * @access private
     */
    var $sLen;

    /**
     * Hash function for the Mask Generation Function
     *
     * @var Crypt_Hash
     * @access private
     */
    var $mgfHash;

    /**
     * Length of MGF hash function output
     *
     * @var int
     * @access private
     */
    var $mgfHLen;

    /**
     * Encryption mode
     *
     * @var int
     * @access private
     */
    var $encryptionMode = CRYPT_RSA_ENCRYPTION_OAEP;

    /**
     * Signature mode
     *
     * @var int
     * @access private
     */
    var $signatureMode = CRYPT_RSA_SIGNATURE_PSS;

    /**
     * Public Exponent
     *
     * @var mixed
     * @access private
     */
    var $publicExponent = false;

    /**
     * Password
     *
     * @var string
     * @access private
     */
    var $password = false;

    /**
     * Components
     *
     * For use with parsing XML formatted keys.  PHP's XML Parser functions use utilized - instead of PHP's DOM functions -
     * because PHP's XML Parser functions work on PHP4 whereas PHP's DOM functions - although surperior - don't.
     *
     * @see self::_start_element_handler()
     * @var array
     * @access private
     */
    var $components = array();

    /**
     * Current String
     *
     * For use with parsing XML formatted keys.
     *
     * @see self::_character_handler()
     * @see self::_stop_element_handler()
     * @var mixed
     * @access private
     */
    var $current;

    /**
     * OpenSSL configuration file name.
     *
     * Set to null to use system configuration file.
     * @see self::createKey()
     * @var mixed
     * @Access public
     */
    var $configFile;

    /**
     * Public key comment field.
     *
     * @var string
     * @access private
     */
    var $comment = 'phpseclib-generated-key';

    /**
     * The constructor
     *
     * If you want to make use of the openssl extension, you'll need to set the mode manually, yourself.  The reason
     * Crypt_RSA doesn't do it is because OpenSSL doesn't fail gracefully.  openssl_pkey_new(), in particular, requires
     * openssl.cnf be present somewhere and, unfortunately, the only real way to find out is too late.
     *
     * @return Crypt_RSA
     * @access public
     */
    function __construct()
    {
        if (!class_exists('Math_BigInteger')) {
            include_once 'Math/BigInteger.php';
        }

        $this->configFile = CRYPT_RSA_OPENSSL_CONFIG;

        if (!defined('CRYPT_RSA_MODE')) {
            switch (true) {
                // Math/BigInteger's openssl requirements are a little less stringent than Crypt/RSA's. in particular,
                // Math/BigInteger doesn't require an openssl.cfg file whereas Crypt/RSA does. so if Math/BigInteger
                // can't use OpenSSL it can be pretty trivially assumed, then, that Crypt/RSA can't either.
                case defined('MATH_BIGINTEGER_OPENSSL_DISABLE'):
                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
                    break;
                // openssl_pkey_get_details - which is used in the only place Crypt/RSA.php uses OpenSSL - was introduced in PHP 5.2.0
                case !function_exists('openssl_pkey_get_details'):
                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
                    break;
                case extension_loaded('openssl') && version_compare(PHP_VERSION, '4.2.0', '>=') && file_exists($this->configFile):
                    // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
                    ob_start();
                    @phpinfo();
                    $content = ob_get_contents();
                    ob_end_clean();

                    preg_match_all('#OpenSSL (Header|Library) Version(.*)#im', $content, $matches);

                    $versions = array();
                    if (!empty($matches[1])) {
                        for ($i = 0; $i < count($matches[1]); $i++) {
                            $fullVersion = trim(str_replace('=>', '', strip_tags($matches[2][$i])));

                            // Remove letter part in OpenSSL version
                            if (!preg_match('/(\d+\.\d+\.\d+)/i', $fullVersion, $m)) {
                                $versions[$matches[1][$i]] = $fullVersion;
                            } else {
                                $versions[$matches[1][$i]] = $m[0];
                            }
                        }
                    }

                    // it doesn't appear that OpenSSL versions were reported upon until PHP 5.3+
                    switch (true) {
                        case !isset($versions['Header']):
                        case !isset($versions['Library']):
                        case $versions['Header'] == $versions['Library']:
                        case version_compare($versions['Header'], '1.0.0') >= 0 && version_compare($versions['Library'], '1.0.0') >= 0:
                            define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_OPENSSL);
                            break;
                        default:
                            define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
                            define('MATH_BIGINTEGER_OPENSSL_DISABLE', true);
                    }
                    break;
                default:
                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
            }
        }

        $this->zero = new Math_BigInteger();
        $this->one = new Math_BigInteger(1);

        $this->hash = new Crypt_Hash('sha1');
        $this->hLen = $this->hash->getLength();
        $this->hashName = 'sha1';
        $this->mgfHash = new Crypt_Hash('sha1');
        $this->mgfHLen = $this->mgfHash->getLength();
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function Crypt_RSA()
    {
        $this->__construct();
    }

    /**
     * Create public / private key pair
     *
     * Returns an array with the following three elements:
     *  - 'privatekey': The private key.
     *  - 'publickey':  The public key.
     *  - 'partialkey': A partially computed key (if the execution time exceeded $timeout).
     *                  Will need to be passed back to Crypt_RSA::createKey() as the third parameter for further processing.
     *
     * @access public
     * @param int $bits
     * @param int $timeout
     * @param Math_BigInteger $p
     */
    function createKey($bits = 1024, $timeout = false, $partial = array())
    {
        if (!defined('CRYPT_RSA_EXPONENT')) {
            // http://en.wikipedia.org/wiki/65537_%28number%29
            define('CRYPT_RSA_EXPONENT', '65537');
        }
        // per , this number ought not result in primes smaller
        // than 256 bits. as a consequence if the key you're trying to create is 1024 bits and you've set CRYPT_RSA_SMALLEST_PRIME
        // to 384 bits then you're going to get a 384 bit prime and a 640 bit prime (384 + 1024 % 384). at least if
        // CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_INTERNAL. if CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_OPENSSL then
        // CRYPT_RSA_SMALLEST_PRIME is ignored (ie. multi-prime RSA support is more intended as a way to speed up RSA key
        // generation when there's a chance neither gmp nor OpenSSL are installed)
        if (!defined('CRYPT_RSA_SMALLEST_PRIME')) {
            define('CRYPT_RSA_SMALLEST_PRIME', 4096);
        }

        // OpenSSL uses 65537 as the exponent and requires RSA keys be 384 bits minimum
        if (CRYPT_RSA_MODE == CRYPT_RSA_MODE_OPENSSL && $bits >= 384 && CRYPT_RSA_EXPONENT == 65537) {
            $config = array();
            if (isset($this->configFile)) {
                $config['config'] = $this->configFile;
            }
            $rsa = openssl_pkey_new(array('private_key_bits' => $bits) + $config);
            openssl_pkey_export($rsa, $privatekey, null, $config);
            $publickey = openssl_pkey_get_details($rsa);
            $publickey = $publickey['key'];

            $privatekey = call_user_func_array(array($this, '_convertPrivateKey'), array_values($this->_parseKey($privatekey, CRYPT_RSA_PRIVATE_FORMAT_PKCS1)));
            $publickey = call_user_func_array(array($this, '_convertPublicKey'), array_values($this->_parseKey($publickey, CRYPT_RSA_PUBLIC_FORMAT_PKCS1)));

            // clear the buffer of error strings stemming from a minimalistic openssl.cnf
            while (openssl_error_string() !== false) {
            }

            return array(
                'privatekey' => $privatekey,
                'publickey' => $publickey,
                'partialkey' => false
            );
        }

        static $e;
        if (!isset($e)) {
            $e = new Math_BigInteger(CRYPT_RSA_EXPONENT);
        }

        extract($this->_generateMinMax($bits));
        $absoluteMin = $min;
        $temp = $bits >> 1; // divide by two to see how many bits P and Q would be
        if ($temp > CRYPT_RSA_SMALLEST_PRIME) {
            $num_primes = floor($bits / CRYPT_RSA_SMALLEST_PRIME);
            $temp = CRYPT_RSA_SMALLEST_PRIME;
        } else {
            $num_primes = 2;
        }
        extract($this->_generateMinMax($temp + $bits % $temp));
        $finalMax = $max;
        extract($this->_generateMinMax($temp));

        $generator = new Math_BigInteger();

        $n = $this->one->copy();
        if (!empty($partial)) {
            extract(unserialize($partial));
        } else {
            $exponents = $coefficients = $primes = array();
            $lcm = array(
                'top' => $this->one->copy(),
                'bottom' => false
            );
        }

        $start = time();
        $i0 = count($primes) + 1;

        do {
            for ($i = $i0; $i <= $num_primes; $i++) {
                if ($timeout !== false) {
                    $timeout-= time() - $start;
                    $start = time();
                    if ($timeout <= 0) {
                        return array(
                            'privatekey' => '',
                            'publickey'  => '',
                            'partialkey' => serialize(array(
                                'primes' => $primes,
                                'coefficients' => $coefficients,
                                'lcm' => $lcm,
                                'exponents' => $exponents
                            ))
                        );
                    }
                }

                if ($i == $num_primes) {
                    list($min, $temp) = $absoluteMin->divide($n);
                    if (!$temp->equals($this->zero)) {
                        $min = $min->add($this->one); // ie. ceil()
                    }
                    $primes[$i] = $generator->randomPrime($min, $finalMax, $timeout);
                } else {
                    $primes[$i] = $generator->randomPrime($min, $max, $timeout);
                }

                if ($primes[$i] === false) { // if we've reached the timeout
                    if (count($primes) > 1) {
                        $partialkey = '';
                    } else {
                        array_pop($primes);
                        $partialkey = serialize(array(
                            'primes' => $primes,
                            'coefficients' => $coefficients,
                            'lcm' => $lcm,
                            'exponents' => $exponents
                        ));
                    }

                    return array(
                        'privatekey' => '',
                        'publickey'  => '',
                        'partialkey' => $partialkey
                    );
                }

                // the first coefficient is calculated differently from the rest
                // ie. instead of being $primes[1]->modInverse($primes[2]), it's $primes[2]->modInverse($primes[1])
                if ($i > 2) {
                    $coefficients[$i] = $n->modInverse($primes[$i]);
                }

                $n = $n->multiply($primes[$i]);

                $temp = $primes[$i]->subtract($this->one);

                // textbook RSA implementations use Euler's totient function instead of the least common multiple.
                // see http://en.wikipedia.org/wiki/Euler%27s_totient_function
                $lcm['top'] = $lcm['top']->multiply($temp);
                $lcm['bottom'] = $lcm['bottom'] === false ? $temp : $lcm['bottom']->gcd($temp);

                $exponents[$i] = $e->modInverse($temp);
            }

            list($temp) = $lcm['top']->divide($lcm['bottom']);
            $gcd = $temp->gcd($e);
            $i0 = 1;
        } while (!$gcd->equals($this->one));

        $d = $e->modInverse($temp);

        $coefficients[2] = $primes[2]->modInverse($primes[1]);

        // from :
        // RSAPrivateKey ::= SEQUENCE {
        //     version           Version,
        //     modulus           INTEGER,  -- n
        //     publicExponent    INTEGER,  -- e
        //     privateExponent   INTEGER,  -- d
        //     prime1            INTEGER,  -- p
        //     prime2            INTEGER,  -- q
        //     exponent1         INTEGER,  -- d mod (p-1)
        //     exponent2         INTEGER,  -- d mod (q-1)
        //     coefficient       INTEGER,  -- (inverse of q) mod p
        //     otherPrimeInfos   OtherPrimeInfos OPTIONAL
        // }

        return array(
            'privatekey' => $this->_convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients),
            'publickey'  => $this->_convertPublicKey($n, $e),
            'partialkey' => false
        );
    }

    /**
     * Convert a private key to the appropriate format.
     *
     * @access private
     * @see self::setPrivateKeyFormat()
     * @param string $RSAPrivateKey
     * @return string
     */
    function _convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients)
    {
        $signed = $this->privateKeyFormat != CRYPT_RSA_PRIVATE_FORMAT_XML;
        $num_primes = count($primes);
        $raw = array(
            'version' => $num_primes == 2 ? chr(0) : chr(1), // two-prime vs. multi
            'modulus' => $n->toBytes($signed),
            'publicExponent' => $e->toBytes($signed),
            'privateExponent' => $d->toBytes($signed),
            'prime1' => $primes[1]->toBytes($signed),
            'prime2' => $primes[2]->toBytes($signed),
            'exponent1' => $exponents[1]->toBytes($signed),
            'exponent2' => $exponents[2]->toBytes($signed),
            'coefficient' => $coefficients[2]->toBytes($signed)
        );

        // if the format in question does not support multi-prime rsa and multi-prime rsa was used,
        // call _convertPublicKey() instead.
        switch ($this->privateKeyFormat) {
            case CRYPT_RSA_PRIVATE_FORMAT_XML:
                if ($num_primes != 2) {
                    return false;
                }
                return "\r\n" .
                       '  ' . base64_encode($raw['modulus']) . "\r\n" .
                       '  ' . base64_encode($raw['publicExponent']) . "\r\n" .
                       '  
' . base64_encode($raw['prime1']) . "
\r\n" .
                       '  ' . base64_encode($raw['prime2']) . "\r\n" .
                       '  ' . base64_encode($raw['exponent1']) . "\r\n" .
                       '  ' . base64_encode($raw['exponent2']) . "\r\n" .
                       '  ' . base64_encode($raw['coefficient']) . "\r\n" .
                       '  ' . base64_encode($raw['privateExponent']) . "\r\n" .
                       '';
                break;
            case CRYPT_RSA_PRIVATE_FORMAT_PUTTY:
                if ($num_primes != 2) {
                    return false;
                }
                $key = "PuTTY-User-Key-File-2: ssh-rsa\r\nEncryption: ";
                $encryption = (!empty($this->password) || is_string($this->password)) ? 'aes256-cbc' : 'none';
                $key.= $encryption;
                $key.= "\r\nComment: " . $this->comment . "\r\n";
                $public = pack(
                    'Na*Na*Na*',
                    strlen('ssh-rsa'),
                    'ssh-rsa',
                    strlen($raw['publicExponent']),
                    $raw['publicExponent'],
                    strlen($raw['modulus']),
                    $raw['modulus']
                );
                $source = pack(
                    'Na*Na*Na*Na*',
                    strlen('ssh-rsa'),
                    'ssh-rsa',
                    strlen($encryption),
                    $encryption,
                    strlen($this->comment),
                    $this->comment,
                    strlen($public),
                    $public
                );
                $public = base64_encode($public);
                $key.= "Public-Lines: " . ((strlen($public) + 63) >> 6) . "\r\n";
                $key.= chunk_split($public, 64);
                $private = pack(
                    'Na*Na*Na*Na*',
                    strlen($raw['privateExponent']),
                    $raw['privateExponent'],
                    strlen($raw['prime1']),
                    $raw['prime1'],
                    strlen($raw['prime2']),
                    $raw['prime2'],
                    strlen($raw['coefficient']),
                    $raw['coefficient']
                );
                if (empty($this->password) && !is_string($this->password)) {
                    $source.= pack('Na*', strlen($private), $private);
                    $hashkey = 'putty-private-key-file-mac-key';
                } else {
                    $private.= crypt_random_string(16 - (strlen($private) & 15));
                    $source.= pack('Na*', strlen($private), $private);
                    if (!class_exists('Crypt_AES')) {
                        include_once 'Crypt/AES.php';
                    }
                    $sequence = 0;
                    $symkey = '';
                    while (strlen($symkey) < 32) {
                        $temp = pack('Na*', $sequence++, $this->password);
                        $symkey.= pack('H*', sha1($temp));
                    }
                    $symkey = substr($symkey, 0, 32);
                    $crypto = new Crypt_AES();

                    $crypto->setKey($symkey);
                    $crypto->disablePadding();
                    $private = $crypto->encrypt($private);
                    $hashkey = 'putty-private-key-file-mac-key' . $this->password;
                }

                $private = base64_encode($private);
                $key.= 'Private-Lines: ' . ((strlen($private) + 63) >> 6) . "\r\n";
                $key.= chunk_split($private, 64);
                if (!class_exists('Crypt_Hash')) {
                    include_once 'Crypt/Hash.php';
                }
                $hash = new Crypt_Hash('sha1');
                $hash->setKey(pack('H*', sha1($hashkey)));
                $key.= 'Private-MAC: ' . bin2hex($hash->hash($source)) . "\r\n";

                return $key;
            case CRYPT_RSA_PRIVATE_FORMAT_OPENSSH:
                if ($num_primes != 2) {
                    return false;
                }
                $publicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($raw['publicExponent']), $raw['publicExponent'], strlen($raw['modulus']), $raw['modulus']);
                $privateKey = pack(
                    'Na*Na*Na*Na*Na*Na*Na*',
                    strlen('ssh-rsa'),
                    'ssh-rsa',
                    strlen($raw['modulus']),
                    $raw['modulus'],
                    strlen($raw['publicExponent']),
                    $raw['publicExponent'],
                    strlen($raw['privateExponent']),
                    $raw['privateExponent'],
                    strlen($raw['coefficient']),
                    $raw['coefficient'],
                    strlen($raw['prime1']),
                    $raw['prime1'],
                    strlen($raw['prime2']),
                    $raw['prime2']
                );
                $checkint = crypt_random_string(4);
                $paddedKey = pack(
                    'a*Na*',
                    $checkint . $checkint . $privateKey,
                    strlen($this->comment),
                    $this->comment
                );
                $paddingLength = (7 * strlen($paddedKey)) % 8;
                for ($i = 1; $i <= $paddingLength; $i++) {
                    $paddedKey.= chr($i);
                }
                $key = pack(
                    'Na*Na*Na*NNa*Na*',
                    strlen('none'),
                    'none',
                    strlen('none'),
                    'none',
                    0,
                    '',
                    1,
                    strlen($publicKey),
                    $publicKey,
                    strlen($paddedKey),
                    $paddedKey
                );
                $key = "openssh-key-v1\0$key";

                return "-----BEGIN OPENSSH PRIVATE KEY-----\r\n" .
                       chunk_split(base64_encode($key), 70) .
                       "-----END OPENSSH PRIVATE KEY-----";
            default: // eg. CRYPT_RSA_PRIVATE_FORMAT_PKCS1
                $components = array();
                foreach ($raw as $name => $value) {
                    $components[$name] = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($value)), $value);
                }

                $RSAPrivateKey = implode('', $components);

                if ($num_primes > 2) {
                    $OtherPrimeInfos = '';
                    for ($i = 3; $i <= $num_primes; $i++) {
                        // OtherPrimeInfos ::= SEQUENCE SIZE(1..MAX) OF OtherPrimeInfo
                        //
                        // OtherPrimeInfo ::= SEQUENCE {
                        //     prime             INTEGER,  -- ri
                        //     exponent          INTEGER,  -- di
                        //     coefficient       INTEGER   -- ti
                        // }
                        $OtherPrimeInfo = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($primes[$i]->toBytes(true))), $primes[$i]->toBytes(true));
                        $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($exponents[$i]->toBytes(true))), $exponents[$i]->toBytes(true));
                        $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($coefficients[$i]->toBytes(true))), $coefficients[$i]->toBytes(true));
                        $OtherPrimeInfos.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfo)), $OtherPrimeInfo);
                    }
                    $RSAPrivateKey.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfos)), $OtherPrimeInfos);
                }

                $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);

                if ($this->privateKeyFormat == CRYPT_RSA_PRIVATE_FORMAT_PKCS8) {
                    $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
                    $RSAPrivateKey = pack(
                        'Ca*a*Ca*a*',
                        CRYPT_RSA_ASN1_INTEGER,
                        "\01\00",
                        $rsaOID,
                        4,
                        $this->_encodeLength(strlen($RSAPrivateKey)),
                        $RSAPrivateKey
                    );
                    $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
                    if (!empty($this->password) || is_string($this->password)) {
                        $salt = crypt_random_string(8);
                        $iterationCount = 2048;

                        if (!class_exists('Crypt_DES')) {
                            include_once 'Crypt/DES.php';
                        }
                        $crypto = new Crypt_DES();
                        $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount);
                        $RSAPrivateKey = $crypto->encrypt($RSAPrivateKey);

                        $parameters = pack(
                            'Ca*a*Ca*N',
                            CRYPT_RSA_ASN1_OCTETSTRING,
                            $this->_encodeLength(strlen($salt)),
                            $salt,
                            CRYPT_RSA_ASN1_INTEGER,
                            $this->_encodeLength(4),
                            $iterationCount
                        );
                        $pbeWithMD5AndDES_CBC = "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03";

                        $encryptionAlgorithm = pack(
                            'Ca*a*Ca*a*',
                            CRYPT_RSA_ASN1_OBJECT,
                            $this->_encodeLength(strlen($pbeWithMD5AndDES_CBC)),
                            $pbeWithMD5AndDES_CBC,
                            CRYPT_RSA_ASN1_SEQUENCE,
                            $this->_encodeLength(strlen($parameters)),
                            $parameters
                        );

                        $RSAPrivateKey = pack(
                            'Ca*a*Ca*a*',
                            CRYPT_RSA_ASN1_SEQUENCE,
                            $this->_encodeLength(strlen($encryptionAlgorithm)),
                            $encryptionAlgorithm,
                            CRYPT_RSA_ASN1_OCTETSTRING,
                            $this->_encodeLength(strlen($RSAPrivateKey)),
                            $RSAPrivateKey
                        );

                        $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);

                        $RSAPrivateKey = "-----BEGIN ENCRYPTED PRIVATE KEY-----\r\n" .
                                         chunk_split(base64_encode($RSAPrivateKey), 64) .
                                         '-----END ENCRYPTED PRIVATE KEY-----';
                    } else {
                        $RSAPrivateKey = "-----BEGIN PRIVATE KEY-----\r\n" .
                                         chunk_split(base64_encode($RSAPrivateKey), 64) .
                                         '-----END PRIVATE KEY-----';
                    }
                    return $RSAPrivateKey;
                }

                if (!empty($this->password) || is_string($this->password)) {
                    $iv = crypt_random_string(8);
                    $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key
                    $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
                    if (!class_exists('Crypt_TripleDES')) {
                        include_once 'Crypt/TripleDES.php';
                    }
                    $des = new Crypt_TripleDES();
                    $des->setKey($symkey);
                    $des->setIV($iv);
                    $iv = strtoupper(bin2hex($iv));
                    $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
                                     "Proc-Type: 4,ENCRYPTED\r\n" .
                                     "DEK-Info: DES-EDE3-CBC,$iv\r\n" .
                                     "\r\n" .
                                     chunk_split(base64_encode($des->encrypt($RSAPrivateKey)), 64) .
                                     '-----END RSA PRIVATE KEY-----';
                } else {
                    $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
                                     chunk_split(base64_encode($RSAPrivateKey), 64) .
                                     '-----END RSA PRIVATE KEY-----';
                }

                return $RSAPrivateKey;
        }
    }

    /**
     * Convert a public key to the appropriate format
     *
     * @access private
     * @see self::setPublicKeyFormat()
     * @param string $RSAPrivateKey
     * @return string
     */
    function _convertPublicKey($n, $e)
    {
        $signed = $this->publicKeyFormat != CRYPT_RSA_PUBLIC_FORMAT_XML;

        $modulus = $n->toBytes($signed);
        $publicExponent = $e->toBytes($signed);

        switch ($this->publicKeyFormat) {
            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
                return array('e' => $e->copy(), 'n' => $n->copy());
            case CRYPT_RSA_PUBLIC_FORMAT_XML:
                return "\r\n" .
                       '  ' . base64_encode($modulus) . "\r\n" .
                       '  ' . base64_encode($publicExponent) . "\r\n" .
                       '';
                break;
            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
                // from :
                // string    "ssh-rsa"
                // mpint     e
                // mpint     n
                $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
                $RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . $this->comment;

                return $RSAPublicKey;
            default: // eg. CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW or CRYPT_RSA_PUBLIC_FORMAT_PKCS1
                // from :
                // RSAPublicKey ::= SEQUENCE {
                //     modulus           INTEGER,  -- n
                //     publicExponent    INTEGER   -- e
                // }
                $components = array(
                    'modulus' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($modulus)), $modulus),
                    'publicExponent' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($publicExponent)), $publicExponent)
                );

                $RSAPublicKey = pack(
                    'Ca*a*a*',
                    CRYPT_RSA_ASN1_SEQUENCE,
                    $this->_encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])),
                    $components['modulus'],
                    $components['publicExponent']
                );

                if ($this->publicKeyFormat == CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW) {
                    $RSAPublicKey = "-----BEGIN RSA PUBLIC KEY-----\r\n" .
                                    chunk_split(base64_encode($RSAPublicKey), 64) .
                                    '-----END RSA PUBLIC KEY-----';
                } else {
                    // sequence(oid(1.2.840.113549.1.1.1), null)) = rsaEncryption.
                    $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
                    $RSAPublicKey = chr(0) . $RSAPublicKey;
                    $RSAPublicKey = chr(3) . $this->_encodeLength(strlen($RSAPublicKey)) . $RSAPublicKey;

                    $RSAPublicKey = pack(
                        'Ca*a*',
                        CRYPT_RSA_ASN1_SEQUENCE,
                        $this->_encodeLength(strlen($rsaOID . $RSAPublicKey)),
                        $rsaOID . $RSAPublicKey
                    );

                    $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
                                     chunk_split(base64_encode($RSAPublicKey), 64) .
                                     '-----END PUBLIC KEY-----';
                }

                return $RSAPublicKey;
        }
    }

    /**
     * Break a public or private key down into its constituant components
     *
     * @access private
     * @see self::_convertPublicKey()
     * @see self::_convertPrivateKey()
     * @param string $key
     * @param int $type
     * @return array
     */
    function _parseKey($key, $type)
    {
        if ($type != CRYPT_RSA_PUBLIC_FORMAT_RAW && !is_string($key)) {
            return false;
        }

        switch ($type) {
            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
                if (!is_array($key)) {
                    return false;
                }
                $components = array();
                switch (true) {
                    case isset($key['e']):
                        $components['publicExponent'] = $key['e']->copy();
                        break;
                    case isset($key['exponent']):
                        $components['publicExponent'] = $key['exponent']->copy();
                        break;
                    case isset($key['publicExponent']):
                        $components['publicExponent'] = $key['publicExponent']->copy();
                        break;
                    case isset($key[0]):
                        $components['publicExponent'] = $key[0]->copy();
                }
                switch (true) {
                    case isset($key['n']):
                        $components['modulus'] = $key['n']->copy();
                        break;
                    case isset($key['modulo']):
                        $components['modulus'] = $key['modulo']->copy();
                        break;
                    case isset($key['modulus']):
                        $components['modulus'] = $key['modulus']->copy();
                        break;
                    case isset($key[1]):
                        $components['modulus'] = $key[1]->copy();
                }
                return isset($components['modulus']) && isset($components['publicExponent']) ? $components : false;
            case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
            case CRYPT_RSA_PRIVATE_FORMAT_PKCS8:
            case CRYPT_RSA_PUBLIC_FORMAT_PKCS1:
                /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
                   "outside the scope" of PKCS#1.  PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
                   protect private keys, however, that's not what OpenSSL* does.  OpenSSL protects private keys by adding
                   two new "fields" to the key - DEK-Info and Proc-Type.  These fields are discussed here:

                   http://tools.ietf.org/html/rfc1421#section-4.6.1.1
                   http://tools.ietf.org/html/rfc1421#section-4.6.1.3

                   DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell.
                   DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation
                   function.  As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's
                   own implementation.  ie. the implementation *is* the standard and any bugs that may exist in that
                   implementation are part of the standard, as well.

                   * OpenSSL is the de facto standard.  It's utilized by OpenSSH and other projects */
                if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) {
                    $iv = pack('H*', trim($matches[2]));
                    $symkey = pack('H*', md5($this->password . substr($iv, 0, 8))); // symkey is short for symmetric key
                    $symkey.= pack('H*', md5($symkey . $this->password . substr($iv, 0, 8)));
                    // remove the Proc-Type / DEK-Info sections as they're no longer needed
                    $key = preg_replace('#^(?:Proc-Type|DEK-Info): .*#m', '', $key);
                    $ciphertext = $this->_extractBER($key);
                    if ($ciphertext === false) {
                        $ciphertext = $key;
                    }
                    switch ($matches[1]) {
                        case 'AES-256-CBC':
                            if (!class_exists('Crypt_AES')) {
                                include_once 'Crypt/AES.php';
                            }
                            $crypto = new Crypt_AES();
                            break;
                        case 'AES-128-CBC':
                            if (!class_exists('Crypt_AES')) {
                                include_once 'Crypt/AES.php';
                            }
                            $symkey = substr($symkey, 0, 16);
                            $crypto = new Crypt_AES();
                            break;
                        case 'DES-EDE3-CFB':
                            if (!class_exists('Crypt_TripleDES')) {
                                include_once 'Crypt/TripleDES.php';
                            }
                            $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CFB);
                            break;
                        case 'DES-EDE3-CBC':
                            if (!class_exists('Crypt_TripleDES')) {
                                include_once 'Crypt/TripleDES.php';
                            }
                            $symkey = substr($symkey, 0, 24);
                            $crypto = new Crypt_TripleDES();
                            break;
                        case 'DES-CBC':
                            if (!class_exists('Crypt_DES')) {
                                include_once 'Crypt/DES.php';
                            }
                            $crypto = new Crypt_DES();
                            break;
                        default:
                            return false;
                    }
                    $crypto->setKey($symkey);
                    $crypto->setIV($iv);
                    $decoded = $crypto->decrypt($ciphertext);
                } else {
                    $decoded = $this->_extractBER($key);
                }

                if ($decoded !== false) {
                    $key = $decoded;
                }

                $components = array();

                if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
                    return false;
                }
                if ($this->_decodeLength($key) != strlen($key)) {
                    return false;
                }

                $tag = ord($this->_string_shift($key));
                /* intended for keys for which OpenSSL's asn1parse returns the following:

                    0:d=0  hl=4 l= 631 cons: SEQUENCE
                    4:d=1  hl=2 l=   1 prim:  INTEGER           :00
                    7:d=1  hl=2 l=  13 cons:  SEQUENCE
                    9:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
                   20:d=2  hl=2 l=   0 prim:   NULL
                   22:d=1  hl=4 l= 609 prim:  OCTET STRING

                   ie. PKCS8 keys*/

                if ($tag == CRYPT_RSA_ASN1_INTEGER && substr($key, 0, 3) == "\x01\x00\x30") {
                    $this->_string_shift($key, 3);
                    $tag = CRYPT_RSA_ASN1_SEQUENCE;
                }

                if ($tag == CRYPT_RSA_ASN1_SEQUENCE) {
                    $temp = $this->_string_shift($key, $this->_decodeLength($key));
                    if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_OBJECT) {
                        return false;
                    }
                    $length = $this->_decodeLength($temp);
                    switch ($this->_string_shift($temp, $length)) {
                        case "\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01": // rsaEncryption
                            break;
                        case "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03": // pbeWithMD5AndDES-CBC
                            /*
                               PBEParameter ::= SEQUENCE {
                                   salt OCTET STRING (SIZE(8)),
                                   iterationCount INTEGER }
                            */
                            if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_SEQUENCE) {
                                return false;
                            }
                            if ($this->_decodeLength($temp) != strlen($temp)) {
                                return false;
                            }
                            $this->_string_shift($temp); // assume it's an octet string
                            $salt = $this->_string_shift($temp, $this->_decodeLength($temp));
                            if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_INTEGER) {
                                return false;
                            }
                            $this->_decodeLength($temp);
                            list(, $iterationCount) = unpack('N', str_pad($temp, 4, chr(0), STR_PAD_LEFT));
                            $this->_string_shift($key); // assume it's an octet string
                            $length = $this->_decodeLength($key);
                            if (strlen($key) != $length) {
                                return false;
                            }

                            if (!class_exists('Crypt_DES')) {
                                include_once 'Crypt/DES.php';
                            }
                            $crypto = new Crypt_DES();
                            $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount);
                            $key = $crypto->decrypt($key);
                            if ($key === false) {
                                return false;
                            }
                            return $this->_parseKey($key, CRYPT_RSA_PRIVATE_FORMAT_PKCS1);
                        default:
                            return false;
                    }
                    /* intended for keys for which OpenSSL's asn1parse returns the following:

                        0:d=0  hl=4 l= 290 cons: SEQUENCE
                        4:d=1  hl=2 l=  13 cons:  SEQUENCE
                        6:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
                       17:d=2  hl=2 l=   0 prim:   NULL
                       19:d=1  hl=4 l= 271 prim:  BIT STRING */
                    $tag = ord($this->_string_shift($key)); // skip over the BIT STRING / OCTET STRING tag
                    $this->_decodeLength($key); // skip over the BIT STRING / OCTET STRING length
                    // "The initial octet shall encode, as an unsigned binary integer wtih bit 1 as the least significant bit, the number of
                    //  unused bits in the final subsequent octet. The number shall be in the range zero to seven."
                    //  -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf (section 8.6.2.2)
                    if ($tag == CRYPT_RSA_ASN1_BITSTRING) {
                        $this->_string_shift($key);
                    }
                    if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
                        return false;
                    }
                    if ($this->_decodeLength($key) != strlen($key)) {
                        return false;
                    }
                    $tag = ord($this->_string_shift($key));
                }
                if ($tag != CRYPT_RSA_ASN1_INTEGER) {
                    return false;
                }

                $length = $this->_decodeLength($key);
                $temp = $this->_string_shift($key, $length);
                if (strlen($temp) != 1 || ord($temp) > 2) {
                    $components['modulus'] = new Math_BigInteger($temp, 256);
                    $this->_string_shift($key); // skip over CRYPT_RSA_ASN1_INTEGER
                    $length = $this->_decodeLength($key);
                    $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);

                    return $components;
                }
                if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_INTEGER) {
                    return false;
                }
                $length = $this->_decodeLength($key);
                $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                $this->_string_shift($key);
                $length = $this->_decodeLength($key);
                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), 256));

                if (!empty($key)) {
                    if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
                        return false;
                    }
                    $this->_decodeLength($key);
                    while (!empty($key)) {
                        if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
                            return false;
                        }
                        $this->_decodeLength($key);
                        $key = substr($key, 1);
                        $length = $this->_decodeLength($key);
                        $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                        $this->_string_shift($key);
                        $length = $this->_decodeLength($key);
                        $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                        $this->_string_shift($key);
                        $length = $this->_decodeLength($key);
                        $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                    }
                }

                return $components;
            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
                $parts = explode(' ', $key, 3);

                $key = isset($parts[1]) ? base64_decode($parts[1]) : false;
                if ($key === false) {
                    return false;
                }

                $comment = isset($parts[2]) ? $parts[2] : false;

                $cleanup = substr($key, 0, 11) == "\0\0\0\7ssh-rsa";

                if (strlen($key) <= 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($key, 4)));
                $publicExponent = new Math_BigInteger($this->_string_shift($key, $length), -256);
                if (strlen($key) <= 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($key, 4)));
                $modulus = new Math_BigInteger($this->_string_shift($key, $length), -256);

                if ($cleanup && strlen($key)) {
                    if (strlen($key) <= 4) {
                        return false;
                    }
                    extract(unpack('Nlength', $this->_string_shift($key, 4)));
                    $realModulus = new Math_BigInteger($this->_string_shift($key, $length), -256);
                    return strlen($key) ? false : array(
                        'modulus' => $realModulus,
                        'publicExponent' => $modulus,
                        'comment' => $comment
                    );
                } else {
                    return strlen($key) ? false : array(
                        'modulus' => $modulus,
                        'publicExponent' => $publicExponent,
                        'comment' => $comment
                    );
                }
            // http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
            // http://en.wikipedia.org/wiki/XML_Signature
            case CRYPT_RSA_PRIVATE_FORMAT_XML:
            case CRYPT_RSA_PUBLIC_FORMAT_XML:
                $this->components = array();

                $xml = xml_parser_create('UTF-8');
                xml_set_object($xml, $this);
                xml_set_element_handler($xml, '_start_element_handler', '_stop_element_handler');
                xml_set_character_data_handler($xml, '_data_handler');
                // add  to account for "dangling" tags like ... that are sometimes added
                if (!xml_parse($xml, '' . $key . '')) {
                    xml_parser_free($xml);
                    unset($xml);
                    return false;
                }

                xml_parser_free($xml);
                unset($xml);

                return isset($this->components['modulus']) && isset($this->components['publicExponent']) ? $this->components : false;
            // from PuTTY's SSHPUBK.C
            case CRYPT_RSA_PRIVATE_FORMAT_PUTTY:
                $components = array();
                $key = preg_split('#\r\n|\r|\n#', $key);
                $type = trim(preg_replace('#PuTTY-User-Key-File-2: (.+)#', '$1', $key[0]));
                if ($type != 'ssh-rsa') {
                    return false;
                }
                $encryption = trim(preg_replace('#Encryption: (.+)#', '$1', $key[1]));
                $comment = trim(preg_replace('#Comment: (.+)#', '$1', $key[2]));

                $publicLength = trim(preg_replace('#Public-Lines: (\d+)#', '$1', $key[3]));
                $public = base64_decode(implode('', array_map('trim', array_slice($key, 4, $publicLength))));
                $public = substr($public, 11);
                extract(unpack('Nlength', $this->_string_shift($public, 4)));
                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($public, $length), -256);
                extract(unpack('Nlength', $this->_string_shift($public, 4)));
                $components['modulus'] = new Math_BigInteger($this->_string_shift($public, $length), -256);

                $privateLength = trim(preg_replace('#Private-Lines: (\d+)#', '$1', $key[$publicLength + 4]));
                $private = base64_decode(implode('', array_map('trim', array_slice($key, $publicLength + 5, $privateLength))));

                switch ($encryption) {
                    case 'aes256-cbc':
                        if (!class_exists('Crypt_AES')) {
                            include_once 'Crypt/AES.php';
                        }
                        $symkey = '';
                        $sequence = 0;
                        while (strlen($symkey) < 32) {
                            $temp = pack('Na*', $sequence++, $this->password);
                            $symkey.= pack('H*', sha1($temp));
                        }
                        $symkey = substr($symkey, 0, 32);
                        $crypto = new Crypt_AES();
                }

                if ($encryption != 'none') {
                    $crypto->setKey($symkey);
                    $crypto->disablePadding();
                    $private = $crypto->decrypt($private);
                    if ($private === false) {
                        return false;
                    }
                }

                extract(unpack('Nlength', $this->_string_shift($private, 4)));
                if (strlen($private) < $length) {
                    return false;
                }
                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($private, $length), -256);
                extract(unpack('Nlength', $this->_string_shift($private, 4)));
                if (strlen($private) < $length) {
                    return false;
                }
                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($private, $length), -256));
                extract(unpack('Nlength', $this->_string_shift($private, 4)));
                if (strlen($private) < $length) {
                    return false;
                }
                $components['primes'][] = new Math_BigInteger($this->_string_shift($private, $length), -256);

                $temp = $components['primes'][1]->subtract($this->one);
                $components['exponents'] = array(1 => $components['publicExponent']->modInverse($temp));
                $temp = $components['primes'][2]->subtract($this->one);
                $components['exponents'][] = $components['publicExponent']->modInverse($temp);

                extract(unpack('Nlength', $this->_string_shift($private, 4)));
                if (strlen($private) < $length) {
                    return false;
                }
                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($private, $length), -256));

                return $components;
            case CRYPT_RSA_PRIVATE_FORMAT_OPENSSH:
                $components = array();
                $decoded = $this->_extractBER($key);
                $magic = $this->_string_shift($decoded, 15);
                if ($magic !== "openssh-key-v1\0") {
                    return false;
                }
                $options = $this->_string_shift($decoded, 24);
                // \0\0\0\4none = ciphername
                // \0\0\0\4none = kdfname
                // \0\0\0\0 = kdfoptions
                // \0\0\0\1 = numkeys
                if ($options != "\0\0\0\4none\0\0\0\4none\0\0\0\0\0\0\0\1") {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($decoded, 4)));
                if (strlen($decoded) < $length) {
                    return false;
                }
                $publicKey = $this->_string_shift($decoded, $length);
                extract(unpack('Nlength', $this->_string_shift($decoded, 4)));
                if (strlen($decoded) < $length) {
                    return false;
                }
                $paddedKey = $this->_string_shift($decoded, $length);

                if ($this->_string_shift($publicKey, 11) !== "\0\0\0\7ssh-rsa") {
                    return false;
                }

                $checkint1 = $this->_string_shift($paddedKey, 4);
                $checkint2 = $this->_string_shift($paddedKey, 4);
                if (strlen($checkint1) != 4 || $checkint1 !== $checkint2) {
                    return false;
                }

                if ($this->_string_shift($paddedKey, 11) !== "\0\0\0\7ssh-rsa") {
                    return false;
                }

                $values = array(
                    &$components['modulus'],
                    &$components['publicExponent'],
                    &$components['privateExponent'],
                    &$components['coefficients'][2],
                    &$components['primes'][1],
                    &$components['primes'][2]
                );

                foreach ($values as &$value) {
                    extract(unpack('Nlength', $this->_string_shift($paddedKey, 4)));
                    if (strlen($paddedKey) < $length) {
                        return false;
                    }
                    $value = new Math_BigInteger($this->_string_shift($paddedKey, $length), -256);
                }

                extract(unpack('Nlength', $this->_string_shift($paddedKey, 4)));
                if (strlen($paddedKey) < $length) {
                    return false;
                }
                $components['comment'] = $this->_string_shift($decoded, $length);

                $temp = $components['primes'][1]->subtract($this->one);
                $components['exponents'] = array(1 => $components['publicExponent']->modInverse($temp));
                $temp = $components['primes'][2]->subtract($this->one);
                $components['exponents'][] = $components['publicExponent']->modInverse($temp);

                return $components;
        }
    }

    /**
     * Returns the key size
     *
     * More specifically, this returns the size of the modulo in bits.
     *
     * @access public
     * @return int
     */
    function getSize()
    {
        return !isset($this->modulus) ? 0 : strlen($this->modulus->toBits());
    }

    /**
     * Start Element Handler
     *
     * Called by xml_set_element_handler()
     *
     * @access private
     * @param resource $parser
     * @param string $name
     * @param array $attribs
     */
    function _start_element_handler($parser, $name, $attribs)
    {
        //$name = strtoupper($name);
        switch ($name) {
            case 'MODULUS':
                $this->current = &$this->components['modulus'];
                break;
            case 'EXPONENT':
                $this->current = &$this->components['publicExponent'];
                break;
            case 'P':
                $this->current = &$this->components['primes'][1];
                break;
            case 'Q':
                $this->current = &$this->components['primes'][2];
                break;
            case 'DP':
                $this->current = &$this->components['exponents'][1];
                break;
            case 'DQ':
                $this->current = &$this->components['exponents'][2];
                break;
            case 'INVERSEQ':
                $this->current = &$this->components['coefficients'][2];
                break;
            case 'D':
                $this->current = &$this->components['privateExponent'];
        }
        $this->current = '';
    }

    /**
     * Stop Element Handler
     *
     * Called by xml_set_element_handler()
     *
     * @access private
     * @param resource $parser
     * @param string $name
     */
    function _stop_element_handler($parser, $name)
    {
        if (isset($this->current)) {
            $this->current = new Math_BigInteger(base64_decode($this->current), 256);
            unset($this->current);
        }
    }

    /**
     * Data Handler
     *
     * Called by xml_set_character_data_handler()
     *
     * @access private
     * @param resource $parser
     * @param string $data
     */
    function _data_handler($parser, $data)
    {
        if (!isset($this->current) || is_object($this->current)) {
            return;
        }
        $this->current.= trim($data);
    }

    /**
     * Loads a public or private key
     *
     * Returns true on success and false on failure (ie. an incorrect password was provided or the key was malformed)
     *
     * @access public
     * @param string $key
     * @param int $type optional
     */
    function loadKey($key, $type = false)
    {
        if (is_object($key) && strtolower(get_class($key)) == 'crypt_rsa') {
            $this->privateKeyFormat = $key->privateKeyFormat;
            $this->publicKeyFormat = $key->publicKeyFormat;
            $this->k = $key->k;
            $this->hLen = $key->hLen;
            $this->sLen = $key->sLen;
            $this->mgfHLen = $key->mgfHLen;
            $this->encryptionMode = $key->encryptionMode;
            $this->signatureMode = $key->signatureMode;
            $this->password = $key->password;
            $this->configFile = $key->configFile;
            $this->comment = $key->comment;

            if (is_object($key->hash)) {
                $this->hash = new Crypt_Hash($key->hash->getHash());
            }
            if (is_object($key->mgfHash)) {
                $this->mgfHash = new Crypt_Hash($key->mgfHash->getHash());
            }

            if (is_object($key->modulus)) {
                $this->modulus = $key->modulus->copy();
            }
            if (is_object($key->exponent)) {
                $this->exponent = $key->exponent->copy();
            }
            if (is_object($key->publicExponent)) {
                $this->publicExponent = $key->publicExponent->copy();
            }

            $this->primes = array();
            $this->exponents = array();
            $this->coefficients = array();

            foreach ($this->primes as $prime) {
                $this->primes[] = $prime->copy();
            }
            foreach ($this->exponents as $exponent) {
                $this->exponents[] = $exponent->copy();
            }
            foreach ($this->coefficients as $coefficient) {
                $this->coefficients[] = $coefficient->copy();
            }

            return true;
        }

        if ($type === false) {
            $types = array(
                CRYPT_RSA_PUBLIC_FORMAT_RAW,
                CRYPT_RSA_PRIVATE_FORMAT_PKCS1,
                CRYPT_RSA_PRIVATE_FORMAT_XML,
                CRYPT_RSA_PRIVATE_FORMAT_PUTTY,
                CRYPT_RSA_PUBLIC_FORMAT_OPENSSH,
                CRYPT_RSA_PRIVATE_FORMAT_OPENSSH
            );
            foreach ($types as $type) {
                $components = $this->_parseKey($key, $type);
                if ($components !== false) {
                    break;
                }
            }
        } else {
            $components = $this->_parseKey($key, $type);
        }

        if ($components === false) {
            $this->comment = null;
            $this->modulus = null;
            $this->k = null;
            $this->exponent = null;
            $this->primes = null;
            $this->exponents = null;
            $this->coefficients = null;
            $this->publicExponent = null;

            return false;
        }

        if (isset($components['comment']) && $components['comment'] !== false) {
            $this->comment = $components['comment'];
        }
        $this->modulus = $components['modulus'];
        $this->k = strlen($this->modulus->toBytes());
        $this->exponent = isset($components['privateExponent']) ? $components['privateExponent'] : $components['publicExponent'];
        if (isset($components['primes'])) {
            $this->primes = $components['primes'];
            $this->exponents = $components['exponents'];
            $this->coefficients = $components['coefficients'];
            $this->publicExponent = $components['publicExponent'];
        } else {
            $this->primes = array();
            $this->exponents = array();
            $this->coefficients = array();
            $this->publicExponent = false;
        }

        switch ($type) {
            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
                $this->setPublicKey();
                break;
            case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
                switch (true) {
                    case strpos($key, '-BEGIN PUBLIC KEY-') !== false:
                    case strpos($key, '-BEGIN RSA PUBLIC KEY-') !== false:
                        $this->setPublicKey();
                }
        }

        return true;
    }

    /**
     * Sets the password
     *
     * Private keys can be encrypted with a password.  To unset the password, pass in the empty string or false.
     * Or rather, pass in $password such that empty($password) && !is_string($password) is true.
     *
     * @see self::createKey()
     * @see self::loadKey()
     * @access public
     * @param string $password
     */
    function setPassword($password = false)
    {
        $this->password = $password;
    }

    /**
     * Defines the public key
     *
     * Some private key formats define the public exponent and some don't.  Those that don't define it are problematic when
     * used in certain contexts.  For example, in SSH-2, RSA authentication works by sending the public key along with a
     * message signed by the private key to the server.  The SSH-2 server looks the public key up in an index of public keys
     * and if it's present then proceeds to verify the signature.  Problem is, if your private key doesn't include the public
     * exponent this won't work unless you manually add the public exponent. phpseclib tries to guess if the key being used
     * is the public key but in the event that it guesses incorrectly you might still want to explicitly set the key as being
     * public.
     *
     * Do note that when a new key is loaded the index will be cleared.
     *
     * Returns true on success, false on failure
     *
     * @see self::getPublicKey()
     * @access public
     * @param string $key optional
     * @param int $type optional
     * @return bool
     */
    function setPublicKey($key = false, $type = false)
    {
        // if a public key has already been loaded return false
        if (!empty($this->publicExponent)) {
            return false;
        }

        if ($key === false && !empty($this->modulus)) {
            $this->publicExponent = $this->exponent;
            return true;
        }

        if ($type === false) {
            $types = array(
                CRYPT_RSA_PUBLIC_FORMAT_RAW,
                CRYPT_RSA_PUBLIC_FORMAT_PKCS1,
                CRYPT_RSA_PUBLIC_FORMAT_XML,
                CRYPT_RSA_PUBLIC_FORMAT_OPENSSH
            );
            foreach ($types as $type) {
                $components = $this->_parseKey($key, $type);
                if ($components !== false) {
                    break;
                }
            }
        } else {
            $components = $this->_parseKey($key, $type);
        }

        if ($components === false) {
            return false;
        }

        if (empty($this->modulus) || !$this->modulus->equals($components['modulus'])) {
            $this->modulus = $components['modulus'];
            $this->exponent = $this->publicExponent = $components['publicExponent'];
            return true;
        }

        $this->publicExponent = $components['publicExponent'];

        return true;
    }

    /**
     * Defines the private key
     *
     * If phpseclib guessed a private key was a public key and loaded it as such it might be desirable to force
     * phpseclib to treat the key as a private key. This function will do that.
     *
     * Do note that when a new key is loaded the index will be cleared.
     *
     * Returns true on success, false on failure
     *
     * @see self::getPublicKey()
     * @access public
     * @param string $key optional
     * @param int $type optional
     * @return bool
     */
    function setPrivateKey($key = false, $type = false)
    {
        if ($key === false && !empty($this->publicExponent)) {
            $this->publicExponent = false;
            return true;
        }

        $rsa = new Crypt_RSA();
        if (!$rsa->loadKey($key, $type)) {
            return false;
        }
        $rsa->publicExponent = false;

        // don't overwrite the old key if the new key is invalid
        $this->loadKey($rsa);
        return true;
    }

    /**
     * Returns the public key
     *
     * The public key is only returned under two circumstances - if the private key had the public key embedded within it
     * or if the public key was set via setPublicKey().  If the currently loaded key is supposed to be the public key this
     * function won't return it since this library, for the most part, doesn't distinguish between public and private keys.
     *
     * @see self::getPublicKey()
     * @access public
     * @param string $key
     * @param int $type optional
     */
    function getPublicKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS8)
    {
        if (empty($this->modulus) || empty($this->publicExponent)) {
            return false;
        }

        $oldFormat = $this->publicKeyFormat;
        $this->publicKeyFormat = $type;
        $temp = $this->_convertPublicKey($this->modulus, $this->publicExponent);
        $this->publicKeyFormat = $oldFormat;
        return $temp;
    }

    /**
     * Returns the public key's fingerprint
     *
     * The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
     * no public key currently loaded, false is returned.
     * Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
     *
     * @access public
     * @param string $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
     * for invalid values.
     * @return mixed
     */
    function getPublicKeyFingerprint($algorithm = 'md5')
    {
        if (empty($this->modulus) || empty($this->publicExponent)) {
            return false;
        }

        $modulus = $this->modulus->toBytes(true);
        $publicExponent = $this->publicExponent->toBytes(true);

        $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);

        switch ($algorithm) {
            case 'sha256':
                $hash = new Crypt_Hash('sha256');
                $base = base64_encode($hash->hash($RSAPublicKey));
                return substr($base, 0, strlen($base) - 1);
            case 'md5':
                return substr(chunk_split(md5($RSAPublicKey), 2, ':'), 0, -1);
            default:
                return false;
        }
    }

    /**
     * Returns the private key
     *
     * The private key is only returned if the currently loaded key contains the constituent prime numbers.
     *
     * @see self::getPublicKey()
     * @access public
     * @param string $key
     * @param int $type optional
     * @return mixed
     */
    function getPrivateKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
    {
        if (empty($this->primes)) {
            return false;
        }

        $oldFormat = $this->privateKeyFormat;
        $this->privateKeyFormat = $type;
        $temp = $this->_convertPrivateKey($this->modulus, $this->publicExponent, $this->exponent, $this->primes, $this->exponents, $this->coefficients);
        $this->privateKeyFormat = $oldFormat;
        return $temp;
    }

    /**
     * Returns a minimalistic private key
     *
     * Returns the private key without the prime number constituants.  Structurally identical to a public key that
     * hasn't been set as the public key
     *
     * @see self::getPrivateKey()
     * @access private
     * @param string $key
     * @param int $type optional
     */
    function _getPrivatePublicKey($mode = CRYPT_RSA_PUBLIC_FORMAT_PKCS8)
    {
        if (empty($this->modulus) || empty($this->exponent)) {
            return false;
        }

        $oldFormat = $this->publicKeyFormat;
        $this->publicKeyFormat = $mode;
        $temp = $this->_convertPublicKey($this->modulus, $this->exponent);
        $this->publicKeyFormat = $oldFormat;
        return $temp;
    }

    /**
     *  __toString() magic method
     *
     * @access public
     * @return string
     */
    function __toString()
    {
        $key = $this->getPrivateKey($this->privateKeyFormat);
        if ($key !== false) {
            return $key;
        }
        $key = $this->_getPrivatePublicKey($this->publicKeyFormat);
        return $key !== false ? $key : '';
    }

    /**
     *  __clone() magic method
     *
     * @access public
     * @return Crypt_RSA
     */
    function __clone()
    {
        $key = new Crypt_RSA();
        $key->loadKey($this);
        return $key;
    }

    /**
     * Generates the smallest and largest numbers requiring $bits bits
     *
     * @access private
     * @param int $bits
     * @return array
     */
    function _generateMinMax($bits)
    {
        $bytes = $bits >> 3;
        $min = str_repeat(chr(0), $bytes);
        $max = str_repeat(chr(0xFF), $bytes);
        $msb = $bits & 7;
        if ($msb) {
            $min = chr(1 << ($msb - 1)) . $min;
            $max = chr((1 << $msb) - 1) . $max;
        } else {
            $min[0] = chr(0x80);
        }

        return array(
            'min' => new Math_BigInteger($min, 256),
            'max' => new Math_BigInteger($max, 256)
        );
    }

    /**
     * DER-decode the length
     *
     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
     *
     * @access private
     * @param string $string
     * @return int
     */
    function _decodeLength(&$string)
    {
        $length = ord($this->_string_shift($string));
        if ($length & 0x80) { // definite length, long form
            $length&= 0x7F;
            $temp = $this->_string_shift($string, $length);
            list(, $length) = unpack('N', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4));
        }
        return $length;
    }

    /**
     * DER-encode the length
     *
     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
     *
     * @access private
     * @param int $length
     * @return string
     */
    function _encodeLength($length)
    {
        if ($length <= 0x7F) {
            return chr($length);
        }

        $temp = ltrim(pack('N', $length), chr(0));
        return pack('Ca*', 0x80 | strlen($temp), $temp);
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }

    /**
     * Determines the private key format
     *
     * @see self::createKey()
     * @access public
     * @param int $format
     */
    function setPrivateKeyFormat($format)
    {
        $this->privateKeyFormat = $format;
    }

    /**
     * Determines the public key format
     *
     * @see self::createKey()
     * @access public
     * @param int $format
     */
    function setPublicKeyFormat($format)
    {
        $this->publicKeyFormat = $format;
    }

    /**
     * Determines which hashing function should be used
     *
     * Used with signature production / verification and (if the encryption mode is CRYPT_RSA_ENCRYPTION_OAEP) encryption and
     * decryption.  If $hash isn't supported, sha1 is used.
     *
     * @access public
     * @param string $hash
     */
    function setHash($hash)
    {
        // Crypt_Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
        switch ($hash) {
            case 'md2':
            case 'md5':
            case 'sha1':
            case 'sha256':
            case 'sha384':
            case 'sha512':
                $this->hash = new Crypt_Hash($hash);
                $this->hashName = $hash;
                break;
            default:
                $this->hash = new Crypt_Hash('sha1');
                $this->hashName = 'sha1';
        }
        $this->hLen = $this->hash->getLength();
    }

    /**
     * Determines which hashing function should be used for the mask generation function
     *
     * The mask generation function is used by CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_SIGNATURE_PSS and although it's
     * best if Hash and MGFHash are set to the same thing this is not a requirement.
     *
     * @access public
     * @param string $hash
     */
    function setMGFHash($hash)
    {
        // Crypt_Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
        switch ($hash) {
            case 'md2':
            case 'md5':
            case 'sha1':
            case 'sha256':
            case 'sha384':
            case 'sha512':
                $this->mgfHash = new Crypt_Hash($hash);
                break;
            default:
                $this->mgfHash = new Crypt_Hash('sha1');
        }
        $this->mgfHLen = $this->mgfHash->getLength();
    }

    /**
     * Determines the salt length
     *
     * To quote from {@link http://tools.ietf.org/html/rfc3447#page-38 RFC3447#page-38}:
     *
     *    Typical salt lengths in octets are hLen (the length of the output
     *    of the hash function Hash) and 0.
     *
     * @access public
     * @param int $format
     */
    function setSaltLength($sLen)
    {
        $this->sLen = $sLen;
    }

    /**
     * Integer-to-Octet-String primitive
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-4.1 RFC3447#section-4.1}.
     *
     * @access private
     * @param Math_BigInteger $x
     * @param int $xLen
     * @return string
     */
    function _i2osp($x, $xLen)
    {
        $x = $x->toBytes();
        if (strlen($x) > $xLen) {
            user_error('Integer too large');
            return false;
        }
        return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
    }

    /**
     * Octet-String-to-Integer primitive
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-4.2 RFC3447#section-4.2}.
     *
     * @access private
     * @param string $x
     * @return Math_BigInteger
     */
    function _os2ip($x)
    {
        return new Math_BigInteger($x, 256);
    }

    /**
     * Exponentiate with or without Chinese Remainder Theorem
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.2}.
     *
     * @access private
     * @param Math_BigInteger $x
     * @return Math_BigInteger
     */
    function _exponentiate($x)
    {
        switch (true) {
            case empty($this->primes):
            case $this->primes[1]->equals($this->zero):
            case empty($this->coefficients):
            case $this->coefficients[2]->equals($this->zero):
            case empty($this->exponents):
            case $this->exponents[1]->equals($this->zero):
                return $x->modPow($this->exponent, $this->modulus);
        }

        $num_primes = count($this->primes);

        if (defined('CRYPT_RSA_DISABLE_BLINDING')) {
            $m_i = array(
                1 => $x->modPow($this->exponents[1], $this->primes[1]),
                2 => $x->modPow($this->exponents[2], $this->primes[2])
            );
            $h = $m_i[1]->subtract($m_i[2]);
            $h = $h->multiply($this->coefficients[2]);
            list(, $h) = $h->divide($this->primes[1]);
            $m = $m_i[2]->add($h->multiply($this->primes[2]));

            $r = $this->primes[1];
            for ($i = 3; $i <= $num_primes; $i++) {
                $m_i = $x->modPow($this->exponents[$i], $this->primes[$i]);

                $r = $r->multiply($this->primes[$i - 1]);

                $h = $m_i->subtract($m);
                $h = $h->multiply($this->coefficients[$i]);
                list(, $h) = $h->divide($this->primes[$i]);

                $m = $m->add($r->multiply($h));
            }
        } else {
            $smallest = $this->primes[1];
            for ($i = 2; $i <= $num_primes; $i++) {
                if ($smallest->compare($this->primes[$i]) > 0) {
                    $smallest = $this->primes[$i];
                }
            }

            $one = new Math_BigInteger(1);

            $r = $one->random($one, $smallest->subtract($one));

            $m_i = array(
                1 => $this->_blind($x, $r, 1),
                2 => $this->_blind($x, $r, 2)
            );
            $h = $m_i[1]->subtract($m_i[2]);
            $h = $h->multiply($this->coefficients[2]);
            list(, $h) = $h->divide($this->primes[1]);
            $m = $m_i[2]->add($h->multiply($this->primes[2]));

            $r = $this->primes[1];
            for ($i = 3; $i <= $num_primes; $i++) {
                $m_i = $this->_blind($x, $r, $i);

                $r = $r->multiply($this->primes[$i - 1]);

                $h = $m_i->subtract($m);
                $h = $h->multiply($this->coefficients[$i]);
                list(, $h) = $h->divide($this->primes[$i]);

                $m = $m->add($r->multiply($h));
            }
        }

        return $m;
    }

    /**
     * Performs RSA Blinding
     *
     * Protects against timing attacks by employing RSA Blinding.
     * Returns $x->modPow($this->exponents[$i], $this->primes[$i])
     *
     * @access private
     * @param Math_BigInteger $x
     * @param Math_BigInteger $r
     * @param int $i
     * @return Math_BigInteger
     */
    function _blind($x, $r, $i)
    {
        $x = $x->multiply($r->modPow($this->publicExponent, $this->primes[$i]));
        $x = $x->modPow($this->exponents[$i], $this->primes[$i]);

        $r = $r->modInverse($this->primes[$i]);
        $x = $x->multiply($r);
        list(, $x) = $x->divide($this->primes[$i]);

        return $x;
    }

    /**
     * Performs blinded RSA equality testing
     *
     * Protects against a particular type of timing attack described.
     *
     * See {@link http://codahale.com/a-lesson-in-timing-attacks/ A Lesson In Timing Attacks (or, Don't use MessageDigest.isEquals)}
     *
     * Thanks for the heads up singpolyma!
     *
     * @access private
     * @param string $x
     * @param string $y
     * @return bool
     */
    function _equals($x, $y)
    {
        if (function_exists('hash_equals')) {
            return hash_equals($x, $y);
        }

        if (strlen($x) != strlen($y)) {
            return false;
        }

        $result = "\0";
        $x^= $y;
        for ($i = 0; $i < strlen($x); $i++) {
            $result|= $x[$i];
        }

        return $result === "\0";
    }

    /**
     * RSAEP
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.1}.
     *
     * @access private
     * @param Math_BigInteger $m
     * @return Math_BigInteger
     */
    function _rsaep($m)
    {
        if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
            user_error('Message representative out of range');
            return false;
        }
        return $this->_exponentiate($m);
    }

    /**
     * RSADP
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.2 RFC3447#section-5.1.2}.
     *
     * @access private
     * @param Math_BigInteger $c
     * @return Math_BigInteger
     */
    function _rsadp($c)
    {
        if ($c->compare($this->zero) < 0 || $c->compare($this->modulus) > 0) {
            user_error('Ciphertext representative out of range');
            return false;
        }
        return $this->_exponentiate($c);
    }

    /**
     * RSASP1
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.1 RFC3447#section-5.2.1}.
     *
     * @access private
     * @param Math_BigInteger $m
     * @return Math_BigInteger
     */
    function _rsasp1($m)
    {
        if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
            user_error('Message representative out of range');
            return false;
        }
        return $this->_exponentiate($m);
    }

    /**
     * RSAVP1
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.2 RFC3447#section-5.2.2}.
     *
     * @access private
     * @param Math_BigInteger $s
     * @return Math_BigInteger
     */
    function _rsavp1($s)
    {
        if ($s->compare($this->zero) < 0 || $s->compare($this->modulus) > 0) {
            user_error('Signature representative out of range');
            return false;
        }
        return $this->_exponentiate($s);
    }

    /**
     * MGF1
     *
     * See {@link http://tools.ietf.org/html/rfc3447#appendix-B.2.1 RFC3447#appendix-B.2.1}.
     *
     * @access private
     * @param string $mgfSeed
     * @param int $mgfLen
     * @return string
     */
    function _mgf1($mgfSeed, $maskLen)
    {
        // if $maskLen would yield strings larger than 4GB, PKCS#1 suggests a "Mask too long" error be output.

        $t = '';
        $count = ceil($maskLen / $this->mgfHLen);
        for ($i = 0; $i < $count; $i++) {
            $c = pack('N', $i);
            $t.= $this->mgfHash->hash($mgfSeed . $c);
        }

        return substr($t, 0, $maskLen);
    }

    /**
     * RSAES-OAEP-ENCRYPT
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.1 RFC3447#section-7.1.1} and
     * {http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding OAES}.
     *
     * @access private
     * @param string $m
     * @param string $l
     * @return string
     */
    function _rsaes_oaep_encrypt($m, $l = '')
    {
        $mLen = strlen($m);

        // Length checking

        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
        // be output.

        if ($mLen > $this->k - 2 * $this->hLen - 2) {
            user_error('Message too long');
            return false;
        }

        // EME-OAEP encoding

        $lHash = $this->hash->hash($l);
        $ps = str_repeat(chr(0), $this->k - $mLen - 2 * $this->hLen - 2);
        $db = $lHash . $ps . chr(1) . $m;
        $seed = crypt_random_string($this->hLen);
        $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
        $maskedDB = $db ^ $dbMask;
        $seedMask = $this->_mgf1($maskedDB, $this->hLen);
        $maskedSeed = $seed ^ $seedMask;
        $em = chr(0) . $maskedSeed . $maskedDB;

        // RSA encryption

        $m = $this->_os2ip($em);
        $c = $this->_rsaep($m);
        $c = $this->_i2osp($c, $this->k);

        // Output the ciphertext C

        return $c;
    }

    /**
     * RSAES-OAEP-DECRYPT
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.2 RFC3447#section-7.1.2}.  The fact that the error
     * messages aren't distinguishable from one another hinders debugging, but, to quote from RFC3447#section-7.1.2:
     *
     *    Note.  Care must be taken to ensure that an opponent cannot
     *    distinguish the different error conditions in Step 3.g, whether by
     *    error message or timing, or, more generally, learn partial
     *    information about the encoded message EM.  Otherwise an opponent may
     *    be able to obtain useful information about the decryption of the
     *    ciphertext C, leading to a chosen-ciphertext attack such as the one
     *    observed by Manger [36].
     *
     * As for $l...  to quote from {@link http://tools.ietf.org/html/rfc3447#page-17 RFC3447#page-17}:
     *
     *    Both the encryption and the decryption operations of RSAES-OAEP take
     *    the value of a label L as input.  In this version of PKCS #1, L is
     *    the empty string; other uses of the label are outside the scope of
     *    this document.
     *
     * @access private
     * @param string $c
     * @param string $l
     * @return string
     */
    function _rsaes_oaep_decrypt($c, $l = '')
    {
        // Length checking

        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
        // be output.

        if (strlen($c) != $this->k || $this->k < 2 * $this->hLen + 2) {
            user_error('Decryption error');
            return false;
        }

        // RSA decryption

        $c = $this->_os2ip($c);
        $m = $this->_rsadp($c);
        if ($m === false) {
            user_error('Decryption error');
            return false;
        }
        $em = $this->_i2osp($m, $this->k);

        // EME-OAEP decoding

        $lHash = $this->hash->hash($l);
        $y = ord($em[0]);
        $maskedSeed = substr($em, 1, $this->hLen);
        $maskedDB = substr($em, $this->hLen + 1);
        $seedMask = $this->_mgf1($maskedDB, $this->hLen);
        $seed = $maskedSeed ^ $seedMask;
        $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
        $db = $maskedDB ^ $dbMask;
        $lHash2 = substr($db, 0, $this->hLen);
        $m = substr($db, $this->hLen);
        $hashesMatch = $this->_equals($lHash, $lHash2);
        $leadingZeros = 1;
        $patternMatch = 0;
        $offset = 0;
        for ($i = 0; $i < strlen($m); $i++) {
            $patternMatch|= $leadingZeros & ($m[$i] === "\1");
            $leadingZeros&= $m[$i] === "\0";
            $offset+= $patternMatch ? 0 : 1;
        }

        // we do & instead of && to avoid https://en.wikipedia.org/wiki/Short-circuit_evaluation
        // to protect against timing attacks
        if (!$hashesMatch & !$patternMatch) {
            user_error('Decryption error');
            return false;
        }

        // Output the message M

        return substr($m, $offset + 1);
    }

    /**
     * Raw Encryption / Decryption
     *
     * Doesn't use padding and is not recommended.
     *
     * @access private
     * @param string $m
     * @return string
     */
    function _raw_encrypt($m)
    {
        $temp = $this->_os2ip($m);
        $temp = $this->_rsaep($temp);
        return  $this->_i2osp($temp, $this->k);
    }

    /**
     * RSAES-PKCS1-V1_5-ENCRYPT
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.1 RFC3447#section-7.2.1}.
     *
     * @access private
     * @param string $m
     * @return string
     */
    function _rsaes_pkcs1_v1_5_encrypt($m)
    {
        $mLen = strlen($m);

        // Length checking

        if ($mLen > $this->k - 11) {
            user_error('Message too long');
            return false;
        }

        // EME-PKCS1-v1_5 encoding

        $psLen = $this->k - $mLen - 3;
        $ps = '';
        while (strlen($ps) != $psLen) {
            $temp = crypt_random_string($psLen - strlen($ps));
            $temp = str_replace("\x00", '', $temp);
            $ps.= $temp;
        }
        $type = 2;
        // see the comments of _rsaes_pkcs1_v1_5_decrypt() to understand why this is being done
        if (defined('CRYPT_RSA_PKCS15_COMPAT') && (!isset($this->publicExponent) || $this->exponent !== $this->publicExponent)) {
            $type = 1;
            // "The padding string PS shall consist of k-3-||D|| octets. ... for block type 01, they shall have value FF"
            $ps = str_repeat("\xFF", $psLen);
        }
        $em = chr(0) . chr($type) . $ps . chr(0) . $m;

        // RSA encryption
        $m = $this->_os2ip($em);
        $c = $this->_rsaep($m);
        $c = $this->_i2osp($c, $this->k);

        // Output the ciphertext C

        return $c;
    }

    /**
     * RSAES-PKCS1-V1_5-DECRYPT
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.2 RFC3447#section-7.2.2}.
     *
     * For compatibility purposes, this function departs slightly from the description given in RFC3447.
     * The reason being that RFC2313#section-8.1 (PKCS#1 v1.5) states that ciphertext's encrypted by the
     * private key should have the second byte set to either 0 or 1 and that ciphertext's encrypted by the
     * public key should have the second byte set to 2.  In RFC3447 (PKCS#1 v2.1), the second byte is supposed
     * to be 2 regardless of which key is used.  For compatibility purposes, we'll just check to make sure the
     * second byte is 2 or less.  If it is, we'll accept the decrypted string as valid.
     *
     * As a consequence of this, a private key encrypted ciphertext produced with Crypt_RSA may not decrypt
     * with a strictly PKCS#1 v1.5 compliant RSA implementation.  Public key encrypted ciphertext's should but
     * not private key encrypted ciphertext's.
     *
     * @access private
     * @param string $c
     * @return string
     */
    function _rsaes_pkcs1_v1_5_decrypt($c)
    {
        // Length checking

        if (strlen($c) != $this->k) { // or if k < 11
            user_error('Decryption error');
            return false;
        }

        // RSA decryption

        $c = $this->_os2ip($c);
        $m = $this->_rsadp($c);

        if ($m === false) {
            user_error('Decryption error');
            return false;
        }
        $em = $this->_i2osp($m, $this->k);

        // EME-PKCS1-v1_5 decoding

        if (ord($em[0]) != 0 || ord($em[1]) > 2) {
            user_error('Decryption error');
            return false;
        }

        $ps = substr($em, 2, strpos($em, chr(0), 2) - 2);
        $m = substr($em, strlen($ps) + 3);

        if (strlen($ps) < 8) {
            user_error('Decryption error');
            return false;
        }

        // Output M

        return $m;
    }

    /**
     * EMSA-PSS-ENCODE
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.1 RFC3447#section-9.1.1}.
     *
     * @access private
     * @param string $m
     * @param int $emBits
     */
    function _emsa_pss_encode($m, $emBits)
    {
        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
        // be output.

        $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8)
        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;

        $mHash = $this->hash->hash($m);
        if ($emLen < $this->hLen + $sLen + 2) {
            user_error('Encoding error');
            return false;
        }

        $salt = crypt_random_string($sLen);
        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
        $h = $this->hash->hash($m2);
        $ps = str_repeat(chr(0), $emLen - $sLen - $this->hLen - 2);
        $db = $ps . chr(1) . $salt;
        $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
        $maskedDB = $db ^ $dbMask;
        $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
        $em = $maskedDB . $h . chr(0xBC);

        return $em;
    }

    /**
     * EMSA-PSS-VERIFY
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.2 RFC3447#section-9.1.2}.
     *
     * @access private
     * @param string $m
     * @param string $em
     * @param int $emBits
     * @return string
     */
    function _emsa_pss_verify($m, $em, $emBits)
    {
        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
        // be output.

        $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8);
        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;

        $mHash = $this->hash->hash($m);
        if ($emLen < $this->hLen + $sLen + 2) {
            return false;
        }

        if ($em[strlen($em) - 1] != chr(0xBC)) {
            return false;
        }

        $maskedDB = substr($em, 0, -$this->hLen - 1);
        $h = substr($em, -$this->hLen - 1, $this->hLen);
        $temp = chr(0xFF << ($emBits & 7));
        if ((~$maskedDB[0] & $temp) != $temp) {
            return false;
        }
        $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
        $db = $maskedDB ^ $dbMask;
        $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
        $temp = $emLen - $this->hLen - $sLen - 2;
        if (substr($db, 0, $temp) != str_repeat(chr(0), $temp) || ord($db[$temp]) != 1) {
            return false;
        }
        $salt = substr($db, $temp + 1); // should be $sLen long
        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
        $h2 = $this->hash->hash($m2);
        return $this->_equals($h, $h2);
    }

    /**
     * RSASSA-PSS-SIGN
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.1 RFC3447#section-8.1.1}.
     *
     * @access private
     * @param string $m
     * @return string
     */
    function _rsassa_pss_sign($m)
    {
        // EMSA-PSS encoding

        $em = $this->_emsa_pss_encode($m, 8 * $this->k - 1);

        // RSA signature

        $m = $this->_os2ip($em);
        $s = $this->_rsasp1($m);
        $s = $this->_i2osp($s, $this->k);

        // Output the signature S

        return $s;
    }

    /**
     * RSASSA-PSS-VERIFY
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.2 RFC3447#section-8.1.2}.
     *
     * @access private
     * @param string $m
     * @param string $s
     * @return string
     */
    function _rsassa_pss_verify($m, $s)
    {
        // Length checking

        if (strlen($s) != $this->k) {
            user_error('Invalid signature');
            return false;
        }

        // RSA verification

        $modBits = 8 * $this->k;

        $s2 = $this->_os2ip($s);
        $m2 = $this->_rsavp1($s2);
        if ($m2 === false) {
            user_error('Invalid signature');
            return false;
        }
        $em = $this->_i2osp($m2, $modBits >> 3);
        if ($em === false) {
            user_error('Invalid signature');
            return false;
        }

        // EMSA-PSS verification

        return $this->_emsa_pss_verify($m, $em, $modBits - 1);
    }

    /**
     * EMSA-PKCS1-V1_5-ENCODE
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}.
     *
     * @access private
     * @param string $m
     * @param int $emLen
     * @return string
     */
    function _emsa_pkcs1_v1_5_encode($m, $emLen)
    {
        $h = $this->hash->hash($m);
        if ($h === false) {
            return false;
        }

        // see http://tools.ietf.org/html/rfc3447#page-43
        switch ($this->hashName) {
            case 'md2':
                $t = pack('H*', '3020300c06082a864886f70d020205000410');
                break;
            case 'md5':
                $t = pack('H*', '3020300c06082a864886f70d020505000410');
                break;
            case 'sha1':
                $t = pack('H*', '3021300906052b0e03021a05000414');
                break;
            case 'sha256':
                $t = pack('H*', '3031300d060960864801650304020105000420');
                break;
            case 'sha384':
                $t = pack('H*', '3041300d060960864801650304020205000430');
                break;
            case 'sha512':
                $t = pack('H*', '3051300d060960864801650304020305000440');
        }
        $t.= $h;
        $tLen = strlen($t);

        if ($emLen < $tLen + 11) {
            user_error('Intended encoded message length too short');
            return false;
        }

        $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3);

        $em = "\0\1$ps\0$t";

        return $em;
    }

    /**
     * RSASSA-PKCS1-V1_5-SIGN
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.1 RFC3447#section-8.2.1}.
     *
     * @access private
     * @param string $m
     * @return string
     */
    function _rsassa_pkcs1_v1_5_sign($m)
    {
        // EMSA-PKCS1-v1_5 encoding

        $em = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
        if ($em === false) {
            user_error('RSA modulus too short');
            return false;
        }

        // RSA signature

        $m = $this->_os2ip($em);
        $s = $this->_rsasp1($m);
        $s = $this->_i2osp($s, $this->k);

        // Output the signature S

        return $s;
    }

    /**
     * RSASSA-PKCS1-V1_5-VERIFY
     *
     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.2 RFC3447#section-8.2.2}.
     *
     * @access private
     * @param string $m
     * @return string
     */
    function _rsassa_pkcs1_v1_5_verify($m, $s)
    {
        // Length checking

        if (strlen($s) != $this->k) {
            user_error('Invalid signature');
            return false;
        }

        // RSA verification

        $s = $this->_os2ip($s);
        $m2 = $this->_rsavp1($s);
        if ($m2 === false) {
            user_error('Invalid signature');
            return false;
        }
        $em = $this->_i2osp($m2, $this->k);
        if ($em === false) {
            user_error('Invalid signature');
            return false;
        }

        // EMSA-PKCS1-v1_5 encoding

        $em2 = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
        if ($em2 === false) {
            user_error('RSA modulus too short');
            return false;
        }

        // Compare
        return $this->_equals($em, $em2);
    }

    /**
     * Set Encryption Mode
     *
     * Valid values include CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1.
     *
     * @access public
     * @param int $mode
     */
    function setEncryptionMode($mode)
    {
        $this->encryptionMode = $mode;
    }

    /**
     * Set Signature Mode
     *
     * Valid values include CRYPT_RSA_SIGNATURE_PSS and CRYPT_RSA_SIGNATURE_PKCS1
     *
     * @access public
     * @param int $mode
     */
    function setSignatureMode($mode)
    {
        $this->signatureMode = $mode;
    }

    /**
     * Set public key comment.
     *
     * @access public
     * @param string $comment
     */
    function setComment($comment)
    {
        $this->comment = $comment;
    }

    /**
     * Get public key comment.
     *
     * @access public
     * @return string
     */
    function getComment()
    {
        return $this->comment;
    }

    /**
     * Encryption
     *
     * Both CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1 both place limits on how long $plaintext can be.
     * If $plaintext exceeds those limits it will be broken up so that it does and the resultant ciphertext's will
     * be concatenated together.
     *
     * @see self::decrypt()
     * @access public
     * @param string $plaintext
     * @return string
     */
    function encrypt($plaintext)
    {
        switch ($this->encryptionMode) {
            case CRYPT_RSA_ENCRYPTION_NONE:
                $plaintext = str_split($plaintext, $this->k);
                $ciphertext = '';
                foreach ($plaintext as $m) {
                    $ciphertext.= $this->_raw_encrypt($m);
                }
                return $ciphertext;
            case CRYPT_RSA_ENCRYPTION_PKCS1:
                $length = $this->k - 11;
                if ($length <= 0) {
                    return false;
                }

                $plaintext = str_split($plaintext, $length);
                $ciphertext = '';
                foreach ($plaintext as $m) {
                    $ciphertext.= $this->_rsaes_pkcs1_v1_5_encrypt($m);
                }
                return $ciphertext;
            //case CRYPT_RSA_ENCRYPTION_OAEP:
            default:
                $length = $this->k - 2 * $this->hLen - 2;
                if ($length <= 0) {
                    return false;
                }

                $plaintext = str_split($plaintext, $length);
                $ciphertext = '';
                foreach ($plaintext as $m) {
                    $ciphertext.= $this->_rsaes_oaep_encrypt($m);
                }
                return $ciphertext;
        }
    }

    /**
     * Decryption
     *
     * @see self::encrypt()
     * @access public
     * @param string $plaintext
     * @return string
     */
    function decrypt($ciphertext)
    {
        if ($this->k <= 0) {
            return false;
        }

        $ciphertext = str_split($ciphertext, $this->k);
        $ciphertext[count($ciphertext) - 1] = str_pad($ciphertext[count($ciphertext) - 1], $this->k, chr(0), STR_PAD_LEFT);

        $plaintext = '';

        switch ($this->encryptionMode) {
            case CRYPT_RSA_ENCRYPTION_NONE:
                $decrypt = '_raw_encrypt';
                break;
            case CRYPT_RSA_ENCRYPTION_PKCS1:
                $decrypt = '_rsaes_pkcs1_v1_5_decrypt';
                break;
            //case CRYPT_RSA_ENCRYPTION_OAEP:
            default:
                $decrypt = '_rsaes_oaep_decrypt';
        }

        foreach ($ciphertext as $c) {
            $temp = $this->$decrypt($c);
            if ($temp === false) {
                return false;
            }
            $plaintext.= $temp;
        }

        return $plaintext;
    }

    /**
     * Create a signature
     *
     * @see self::verify()
     * @access public
     * @param string $message
     * @return string
     */
    function sign($message)
    {
        if (empty($this->modulus) || empty($this->exponent)) {
            return false;
        }

        switch ($this->signatureMode) {
            case CRYPT_RSA_SIGNATURE_PKCS1:
                return $this->_rsassa_pkcs1_v1_5_sign($message);
            //case CRYPT_RSA_SIGNATURE_PSS:
            default:
                return $this->_rsassa_pss_sign($message);
        }
    }

    /**
     * Verifies a signature
     *
     * @see self::sign()
     * @access public
     * @param string $message
     * @param string $signature
     * @return bool
     */
    function verify($message, $signature)
    {
        if (empty($this->modulus) || empty($this->exponent)) {
            return false;
        }

        switch ($this->signatureMode) {
            case CRYPT_RSA_SIGNATURE_PKCS1:
                return $this->_rsassa_pkcs1_v1_5_verify($message, $signature);
            //case CRYPT_RSA_SIGNATURE_PSS:
            default:
                return $this->_rsassa_pss_verify($message, $signature);
        }
    }

    /**
     * Extract raw BER from Base64 encoding
     *
     * @access private
     * @param string $str
     * @return string
     */
    function _extractBER($str)
    {
        /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them
         * above and beyond the ceritificate.
         * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line:
         *
         * Bag Attributes
         *     localKeyID: 01 00 00 00
         * subject=/O=organization/OU=org unit/CN=common name
         * issuer=/O=organization/CN=common name
         */
        $temp = preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1);
        // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
        $temp = preg_replace('#-+[^-]+-+#', '', $temp);
        // remove new lines
        $temp = str_replace(array("\r", "\n", ' '), '', $temp);
        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
        return $temp != false ? $temp : $str;
    }
}
phpseclib-1.0.18/phpseclib/Crypt/Random.php000066400000000000000000000354541354156543400206020ustar00rootroot00000000000000
 * 
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_Random
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

// laravel is a PHP framework that utilizes phpseclib. laravel workbenches may, independently,
// have phpseclib as a requirement as well. if you're developing such a program you may encounter
// a "Cannot redeclare crypt_random_string()" error.
if (!function_exists('crypt_random_string')) {
    /**
     * "Is Windows" test
     *
     * @access private
     */
    define('CRYPT_RANDOM_IS_WINDOWS', strtoupper(substr(PHP_OS, 0, 3)) === 'WIN');

    /**
     * Generate a random string.
     *
     * Although microoptimizations are generally discouraged as they impair readability this function is ripe with
     * microoptimizations because this function has the potential of being called a huge number of times.
     * eg. for RSA key generation.
     *
     * @param int $length
     * @return string
     * @access public
     */
    function crypt_random_string($length)
    {
        if (!$length) {
            return '';
        }

        if (CRYPT_RANDOM_IS_WINDOWS) {
            // method 1. prior to PHP 5.3, mcrypt_create_iv() would call rand() on windows
            if (extension_loaded('mcrypt') && version_compare(PHP_VERSION, '5.3.0', '>=')) {
                return @mcrypt_create_iv($length);
            }
            // method 2. openssl_random_pseudo_bytes was introduced in PHP 5.3.0 but prior to PHP 5.3.4 there was,
            // to quote , "possible blocking behavior". as of 5.3.4
            // openssl_random_pseudo_bytes and mcrypt_create_iv do the exact same thing on Windows. ie. they both
            // call php_win32_get_random_bytes():
            //
            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/openssl/openssl.c#L5008
            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/mcrypt/mcrypt.c#L1392
            //
            // php_win32_get_random_bytes() is defined thusly:
            //
            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/win32/winutil.c#L80
            //
            // we're calling it, all the same, in the off chance that the mcrypt extension is not available
            if (extension_loaded('openssl') && version_compare(PHP_VERSION, '5.3.4', '>=')) {
                return openssl_random_pseudo_bytes($length);
            }
        } else {
            // method 1. the fastest
            if (extension_loaded('openssl') && version_compare(PHP_VERSION, '5.3.0', '>=')) {
                return openssl_random_pseudo_bytes($length);
            }
            // method 2
            static $fp = true;
            if ($fp === true) {
                // warning's will be output unles the error suppression operator is used. errors such as
                // "open_basedir restriction in effect", "Permission denied", "No such file or directory", etc.
                $fp = @fopen('/dev/urandom', 'rb');
            }
            if ($fp !== true && $fp !== false) { // surprisingly faster than !is_bool() or is_resource()
                return fread($fp, $length);
            }
            // method 3. pretty much does the same thing as method 2 per the following url:
            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/mcrypt/mcrypt.c#L1391
            // surprisingly slower than method 2. maybe that's because mcrypt_create_iv does a bunch of error checking that we're
            // not doing. regardless, this'll only be called if this PHP script couldn't open /dev/urandom due to open_basedir
            // restrictions or some such
            if (extension_loaded('mcrypt')) {
                return @mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
            }
        }
        // at this point we have no choice but to use a pure-PHP CSPRNG

        // cascade entropy across multiple PHP instances by fixing the session and collecting all
        // environmental variables, including the previous session data and the current session
        // data.
        //
        // mt_rand seeds itself by looking at the PID and the time, both of which are (relatively)
        // easy to guess at. linux uses mouse clicks, keyboard timings, etc, as entropy sources, but
        // PHP isn't low level to be able to use those as sources and on a web server there's not likely
        // going to be a ton of keyboard or mouse action. web servers do have one thing that we can use
        // however, a ton of people visiting the website. obviously you don't want to base your seeding
        // soley on parameters a potential attacker sends but (1) not everything in $_SERVER is controlled
        // by the user and (2) this isn't just looking at the data sent by the current user - it's based
        // on the data sent by all users. one user requests the page and a hash of their info is saved.
        // another user visits the page and the serialization of their data is utilized along with the
        // server envirnment stuff and a hash of the previous http request data (which itself utilizes
        // a hash of the session data before that). certainly an attacker should be assumed to have
        // full control over his own http requests. he, however, is not going to have control over
        // everyone's http requests.
        static $crypto = false, $v;
        if ($crypto === false) {
            // save old session data
            $old_session_id = session_id();
            $old_use_cookies = ini_get('session.use_cookies');
            $old_session_cache_limiter = session_cache_limiter();
            $_OLD_SESSION = isset($_SESSION) ? $_SESSION : false;
            if ($old_session_id != '') {
                session_write_close();
            }

            session_id(1);
            ini_set('session.use_cookies', 0);
            session_cache_limiter('');
            session_start();

            $v = $seed = $_SESSION['seed'] = pack('H*', sha1(
                (isset($_SERVER) ? phpseclib_safe_serialize($_SERVER) : '') .
                (isset($_POST) ? phpseclib_safe_serialize($_POST) : '') .
                (isset($_GET) ? phpseclib_safe_serialize($_GET) : '') .
                (isset($_COOKIE) ? phpseclib_safe_serialize($_COOKIE) : '') .
                phpseclib_safe_serialize($GLOBALS) .
                phpseclib_safe_serialize($_SESSION) .
                phpseclib_safe_serialize($_OLD_SESSION)
            ));
            if (!isset($_SESSION['count'])) {
                $_SESSION['count'] = 0;
            }
            $_SESSION['count']++;

            session_write_close();

            // restore old session data
            if ($old_session_id != '') {
                session_id($old_session_id);
                session_start();
                ini_set('session.use_cookies', $old_use_cookies);
                session_cache_limiter($old_session_cache_limiter);
            } else {
                if ($_OLD_SESSION !== false) {
                    $_SESSION = $_OLD_SESSION;
                    unset($_OLD_SESSION);
                } else {
                    unset($_SESSION);
                }
            }

            // in SSH2 a shared secret and an exchange hash are generated through the key exchange process.
            // the IV client to server is the hash of that "nonce" with the letter A and for the encryption key it's the letter C.
            // if the hash doesn't produce enough a key or an IV that's long enough concat successive hashes of the
            // original hash and the current hash. we'll be emulating that. for more info see the following URL:
            //
            // http://tools.ietf.org/html/rfc4253#section-7.2
            //
            // see the is_string($crypto) part for an example of how to expand the keys
            $key = pack('H*', sha1($seed . 'A'));
            $iv = pack('H*', sha1($seed . 'C'));

            // ciphers are used as per the nist.gov link below. also, see this link:
            //
            // http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator#Designs_based_on_cryptographic_primitives
            switch (true) {
                case phpseclib_resolve_include_path('Crypt/AES.php'):
                    if (!class_exists('Crypt_AES')) {
                        include_once 'AES.php';
                    }
                    $crypto = new Crypt_AES(CRYPT_AES_MODE_CTR);
                    break;
                case phpseclib_resolve_include_path('Crypt/Twofish.php'):
                    if (!class_exists('Crypt_Twofish')) {
                        include_once 'Twofish.php';
                    }
                    $crypto = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
                    break;
                case phpseclib_resolve_include_path('Crypt/Blowfish.php'):
                    if (!class_exists('Crypt_Blowfish')) {
                        include_once 'Blowfish.php';
                    }
                    $crypto = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
                    break;
                case phpseclib_resolve_include_path('Crypt/TripleDES.php'):
                    if (!class_exists('Crypt_TripleDES')) {
                        include_once 'TripleDES.php';
                    }
                    $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
                    break;
                case phpseclib_resolve_include_path('Crypt/DES.php'):
                    if (!class_exists('Crypt_DES')) {
                        include_once 'DES.php';
                    }
                    $crypto = new Crypt_DES(CRYPT_DES_MODE_CTR);
                    break;
                case phpseclib_resolve_include_path('Crypt/RC4.php'):
                    if (!class_exists('Crypt_RC4')) {
                        include_once 'RC4.php';
                    }
                    $crypto = new Crypt_RC4();
                    break;
                default:
                    user_error('crypt_random_string requires at least one symmetric cipher be loaded');
                    return false;
            }

            $crypto->setKey($key);
            $crypto->setIV($iv);
            $crypto->enableContinuousBuffer();
        }

        //return $crypto->encrypt(str_repeat("\0", $length));

        // the following is based off of ANSI X9.31:
        //
        // http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
        //
        // OpenSSL uses that same standard for it's random numbers:
        //
        // http://www.opensource.apple.com/source/OpenSSL/OpenSSL-38/openssl/fips-1.0/rand/fips_rand.c
        // (do a search for "ANS X9.31 A.2.4")
        $result = '';
        while (strlen($result) < $length) {
            $i = $crypto->encrypt(microtime()); // strlen(microtime()) == 21
            $r = $crypto->encrypt($i ^ $v); // strlen($v) == 20
            $v = $crypto->encrypt($r ^ $i); // strlen($r) == 20
            $result.= $r;
        }
        return substr($result, 0, $length);
    }
}

if (!function_exists('phpseclib_safe_serialize')) {
    /**
     * Safely serialize variables
     *
     * If a class has a private __sleep() method it'll give a fatal error on PHP 5.2 and earlier.
     * PHP 5.3 will emit a warning.
     *
     * @param mixed $arr
     * @access public
     */
    function phpseclib_safe_serialize(&$arr)
    {
        if (is_object($arr)) {
            return '';
        }
        if (!is_array($arr)) {
            return serialize($arr);
        }
        // prevent circular array recursion
        if (isset($arr['__phpseclib_marker'])) {
            return '';
        }
        $safearr = array();
        $arr['__phpseclib_marker'] = true;
        foreach (array_keys($arr) as $key) {
            // do not recurse on the '__phpseclib_marker' key itself, for smaller memory usage
            if ($key !== '__phpseclib_marker') {
                $safearr[$key] = phpseclib_safe_serialize($arr[$key]);
            }
        }
        unset($arr['__phpseclib_marker']);
        return serialize($safearr);
    }
}

if (!function_exists('phpseclib_resolve_include_path')) {
    /**
     * Resolve filename against the include path.
     *
     * Wrapper around stream_resolve_include_path() (which was introduced in
     * PHP 5.3.2) with fallback implementation for earlier PHP versions.
     *
     * @param string $filename
     * @return string|false
     * @access public
     */
    function phpseclib_resolve_include_path($filename)
    {
        if (function_exists('stream_resolve_include_path')) {
            return stream_resolve_include_path($filename);
        }

        // handle non-relative paths
        if (file_exists($filename)) {
            return realpath($filename);
        }

        $paths = PATH_SEPARATOR == ':' ?
            preg_split('#(?
 * setKey('abcdefghijklmnop');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $rijndael->decrypt($rijndael->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_Rijndael
 * @author    Jim Wigginton 
 * @copyright 2008 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_RIJNDAEL_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_RIJNDAEL_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_RIJNDAEL_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_RIJNDAEL_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_RIJNDAEL_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of Rijndael.
 *
 * @package Crypt_Rijndael
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_Rijndael extends Crypt_Base
{
    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'RIJNDAEL';

    /**
     * The mcrypt specific name of the cipher
     *
     * Mcrypt is useable for 128/192/256-bit $block_size/$key_length. For 160/224 not.
     * Crypt_Rijndael determines automatically whether mcrypt is useable
     * or not for the current $block_size/$key_length.
     * In case of, $cipher_name_mcrypt will be set dynamically at run time accordingly.
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @see Crypt_Base::engine
     * @see self::isValidEngine()
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'rijndael-128';

    /**
     * The default salt used by setPassword()
     *
     * @see Crypt_Base::password_default_salt
     * @see Crypt_Base::setPassword()
     * @var string
     * @access private
     */
    var $password_default_salt = 'phpseclib';

    /**
     * The Key Schedule
     *
     * @see self::_setup()
     * @var array
     * @access private
     */
    var $w;

    /**
     * The Inverse Key Schedule
     *
     * @see self::_setup()
     * @var array
     * @access private
     */
    var $dw;

    /**
     * The Block Length divided by 32
     *
     * @see self::setBlockLength()
     * @var int
     * @access private
     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4.  Exists in conjunction with $block_size
     *    because the encryption / decryption / key schedule creation requires this number and not $block_size.  We could
     *    derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
     *    of that, we'll just precompute it once.
     */
    var $Nb = 4;

    /**
     * The Key Length (in bytes)
     *
     * @see self::setKeyLength()
     * @var int
     * @access private
     * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
     *    of that, we'll just precompute it once.
     */
    var $key_length = 16;

    /**
     * The Key Length divided by 32
     *
     * @see self::setKeyLength()
     * @var int
     * @access private
     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
     */
    var $Nk = 4;

    /**
     * The Number of Rounds
     *
     * @var int
     * @access private
     * @internal The max value is 14, the min value is 10.
     */
    var $Nr;

    /**
     * Shift offsets
     *
     * @var array
     * @access private
     */
    var $c;

    /**
     * Holds the last used key- and block_size information
     *
     * @var array
     * @access private
     */
    var $kl;

    /**
     * Sets the key.
     *
     * Keys can be of any length.  Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and
     * whose length is a multiple of 32.  If the key is less than 256-bits and the key length isn't set, we round the length
     * up to the closest valid key length, padding $key with null bytes.  If the key is more than 256-bits, we trim the
     * excess bits.
     *
     * If the key is not explicitly set, it'll be assumed to be all null bytes.
     *
     * Note: 160/224-bit keys must explicitly set by setKeyLength(), otherwise they will be round/pad up to 192/256 bits.
     *
     * @see Crypt_Base:setKey()
     * @see self::setKeyLength()
     * @access public
     * @param string $key
     */
    function setKey($key)
    {
        if (!$this->explicit_key_length) {
            $length = strlen($key);
            switch (true) {
                case $length <= 16:
                    $this->key_size = 16;
                    break;
                case $length <= 20:
                    $this->key_size = 20;
                    break;
                case $length <= 24:
                    $this->key_size = 24;
                    break;
                case $length <= 28:
                    $this->key_size = 28;
                    break;
                default:
                    $this->key_size = 32;
            }
        }
        parent::setKey($key);
    }

    /**
     * Sets the key length
     *
     * Valid key lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
     *
     * Note: phpseclib extends Rijndael (and AES) for using 160- and 224-bit keys but they are officially not defined
     *       and the most (if not all) implementations are not able using 160/224-bit keys but round/pad them up to
     *       192/256 bits as, for example, mcrypt will do.
     *
     *       That said, if you want be compatible with other Rijndael and AES implementations,
     *       you should not setKeyLength(160) or setKeyLength(224).
     *
     * Additional: In case of 160- and 224-bit keys, phpseclib will/can, for that reason, not use
     *             the mcrypt php extension, even if available.
     *             This results then in slower encryption.
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        switch (true) {
            case $length <= 128:
                $this->key_length = 16;
                break;
            case $length <= 160:
                $this->key_length = 20;
                break;
            case $length <= 192:
                $this->key_length = 24;
                break;
            case $length <= 224:
                $this->key_length = 28;
                break;
            default:
                $this->key_length = 32;
        }

        parent::setKeyLength($length);
    }

    /**
     * Sets the block length
     *
     * Valid block lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
     *
     * @access public
     * @param int $length
     */
    function setBlockLength($length)
    {
        $length >>= 5;
        if ($length > 8) {
            $length = 8;
        } elseif ($length < 4) {
            $length = 4;
        }
        $this->Nb = $length;
        $this->block_size = $length << 2;
        $this->changed = true;
        $this->_setEngine();
    }

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::Crypt_Base()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        switch ($engine) {
            case CRYPT_ENGINE_OPENSSL:
                if ($this->block_size != 16) {
                    return false;
                }
                $this->cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb';
                $this->cipher_name_openssl = 'aes-' . ($this->key_length << 3) . '-' . $this->_openssl_translate_mode();
                break;
            case CRYPT_ENGINE_MCRYPT:
                $this->cipher_name_mcrypt = 'rijndael-' . ($this->block_size << 3);
                if ($this->key_length % 8) { // is it a 160/224-bit key?
                    // mcrypt is not usable for them, only for 128/192/256-bit keys
                    return false;
                }
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Encrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _encryptBlock($in)
    {
        static $tables;
        if (empty($tables)) {
            $tables = &$this->_getTables();
        }
        $t0   = $tables[0];
        $t1   = $tables[1];
        $t2   = $tables[2];
        $t3   = $tables[3];
        $sbox = $tables[4];

        $state = array();
        $words = unpack('N*', $in);

        $c = $this->c;
        $w = $this->w;
        $Nb = $this->Nb;
        $Nr = $this->Nr;

        // addRoundKey
        $wc = $Nb - 1;
        foreach ($words as $word) {
            $state[] = $word ^ $w[++$wc];
        }

        // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
        // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding
        // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf.
        // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization.
        // Unfortunately, the description given there is not quite correct.  Per aes.spec.v316.pdf#page=19 [1],
        // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well.

        // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
        $temp = array();
        for ($round = 1; $round < $Nr; ++$round) {
            $i = 0; // $c[0] == 0
            $j = $c[1];
            $k = $c[2];
            $l = $c[3];

            while ($i < $Nb) {
                $temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^
                            $t1[$state[$j] >> 16 & 0x000000FF] ^
                            $t2[$state[$k] >>  8 & 0x000000FF] ^
                            $t3[$state[$l]       & 0x000000FF] ^
                            $w[++$wc];
                ++$i;
                $j = ($j + 1) % $Nb;
                $k = ($k + 1) % $Nb;
                $l = ($l + 1) % $Nb;
            }
            $state = $temp;
        }

        // subWord
        for ($i = 0; $i < $Nb; ++$i) {
            $state[$i] =   $sbox[$state[$i]       & 0x000000FF]        |
                          ($sbox[$state[$i] >>  8 & 0x000000FF] <<  8) |
                          ($sbox[$state[$i] >> 16 & 0x000000FF] << 16) |
                          ($sbox[$state[$i] >> 24 & 0x000000FF] << 24);
        }

        // shiftRows + addRoundKey
        $i = 0; // $c[0] == 0
        $j = $c[1];
        $k = $c[2];
        $l = $c[3];
        while ($i < $Nb) {
            $temp[$i] = ($state[$i] & 0xFF000000) ^
                        ($state[$j] & 0x00FF0000) ^
                        ($state[$k] & 0x0000FF00) ^
                        ($state[$l] & 0x000000FF) ^
                         $w[$i];
            ++$i;
            $j = ($j + 1) % $Nb;
            $k = ($k + 1) % $Nb;
            $l = ($l + 1) % $Nb;
        }

        switch ($Nb) {
            case 8:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
            case 7:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
            case 6:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
            case 5:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
            default:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
        }
    }

    /**
     * Decrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _decryptBlock($in)
    {
        static $invtables;
        if (empty($invtables)) {
            $invtables = &$this->_getInvTables();
        }
        $dt0   = $invtables[0];
        $dt1   = $invtables[1];
        $dt2   = $invtables[2];
        $dt3   = $invtables[3];
        $isbox = $invtables[4];

        $state = array();
        $words = unpack('N*', $in);

        $c  = $this->c;
        $dw = $this->dw;
        $Nb = $this->Nb;
        $Nr = $this->Nr;

        // addRoundKey
        $wc = $Nb - 1;
        foreach ($words as $word) {
            $state[] = $word ^ $dw[++$wc];
        }

        $temp = array();
        for ($round = $Nr - 1; $round > 0; --$round) {
            $i = 0; // $c[0] == 0
            $j = $Nb - $c[1];
            $k = $Nb - $c[2];
            $l = $Nb - $c[3];

            while ($i < $Nb) {
                $temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^
                            $dt1[$state[$j] >> 16 & 0x000000FF] ^
                            $dt2[$state[$k] >>  8 & 0x000000FF] ^
                            $dt3[$state[$l]       & 0x000000FF] ^
                            $dw[++$wc];
                ++$i;
                $j = ($j + 1) % $Nb;
                $k = ($k + 1) % $Nb;
                $l = ($l + 1) % $Nb;
            }
            $state = $temp;
        }

        // invShiftRows + invSubWord + addRoundKey
        $i = 0; // $c[0] == 0
        $j = $Nb - $c[1];
        $k = $Nb - $c[2];
        $l = $Nb - $c[3];

        while ($i < $Nb) {
            $word = ($state[$i] & 0xFF000000) |
                    ($state[$j] & 0x00FF0000) |
                    ($state[$k] & 0x0000FF00) |
                    ($state[$l] & 0x000000FF);

            $temp[$i] = $dw[$i] ^ ($isbox[$word       & 0x000000FF]        |
                                  ($isbox[$word >>  8 & 0x000000FF] <<  8) |
                                  ($isbox[$word >> 16 & 0x000000FF] << 16) |
                                  ($isbox[$word >> 24 & 0x000000FF] << 24));
            ++$i;
            $j = ($j + 1) % $Nb;
            $k = ($k + 1) % $Nb;
            $l = ($l + 1) % $Nb;
        }

        switch ($Nb) {
            case 8:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
            case 7:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
            case 6:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
            case 5:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
            default:
                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
        }
    }

    /**
     * Setup the key (expansion)
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field.
        // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
        static $rcon = array(0,
            0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
            0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
            0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
            0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
            0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
            0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
        );

        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->key_length === $this->kl['key_length'] && $this->block_size === $this->kl['block_size']) {
            // already expanded
            return;
        }
        $this->kl = array('key' => $this->key, 'key_length' => $this->key_length, 'block_size' => $this->block_size);

        $this->Nk = $this->key_length >> 2;
        // see Rijndael-ammended.pdf#page=44
        $this->Nr = max($this->Nk, $this->Nb) + 6;

        // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44,
        //     "Table 8: Shift offsets in Shiftrow for the alternative block lengths"
        // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14,
        //     "Table 2: Shift offsets for different block lengths"
        switch ($this->Nb) {
            case 4:
            case 5:
            case 6:
                $this->c = array(0, 1, 2, 3);
                break;
            case 7:
                $this->c = array(0, 1, 2, 4);
                break;
            case 8:
                $this->c = array(0, 1, 3, 4);
        }

        $w = array_values(unpack('N*words', $this->key));

        $length = $this->Nb * ($this->Nr + 1);
        for ($i = $this->Nk; $i < $length; $i++) {
            $temp = $w[$i - 1];
            if ($i % $this->Nk == 0) {
                // according to , "the size of an integer is platform-dependent".
                // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine,
                // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and'
                // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is.
                $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord
                $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk];
            } elseif ($this->Nk > 6 && $i % $this->Nk == 4) {
                $temp = $this->_subWord($temp);
            }
            $w[$i] = $w[$i - $this->Nk] ^ $temp;
        }

        // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns
        // and generate the inverse key schedule.  more specifically,
        // according to  (section 5.3.3),
        // "The key expansion for the Inverse Cipher is defined as follows:
        //        1. Apply the Key Expansion.
        //        2. Apply InvMixColumn to all Round Keys except the first and the last one."
        // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
        list($dt0, $dt1, $dt2, $dt3) = $this->_getInvTables();
        $temp = $this->w = $this->dw = array();
        for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
            if ($col == $this->Nb) {
                if ($row == 0) {
                    $this->dw[0] = $this->w[0];
                } else {
                    // subWord + invMixColumn + invSubWord = invMixColumn
                    $j = 0;
                    while ($j < $this->Nb) {
                        $dw = $this->_subWord($this->w[$row][$j]);
                        $temp[$j] = $dt0[$dw >> 24 & 0x000000FF] ^
                                    $dt1[$dw >> 16 & 0x000000FF] ^
                                    $dt2[$dw >>  8 & 0x000000FF] ^
                                    $dt3[$dw       & 0x000000FF];
                        $j++;
                    }
                    $this->dw[$row] = $temp;
                }

                $col = 0;
                $row++;
            }
            $this->w[$row][$col] = $w[$i];
        }

        $this->dw[$row] = $this->w[$row];

        // Converting to 1-dim key arrays (both ascending)
        $this->dw = array_reverse($this->dw);
        $w  = array_pop($this->w);
        $dw = array_pop($this->dw);
        foreach ($this->w as $r => $wr) {
            foreach ($wr as $c => $wc) {
                $w[]  = $wc;
                $dw[] = $this->dw[$r][$c];
            }
        }
        $this->w  = $w;
        $this->dw = $dw;
    }

    /**
     * Performs S-Box substitutions
     *
     * @access private
     * @param int $word
     */
    function _subWord($word)
    {
        static $sbox;
        if (empty($sbox)) {
            list(, , , , $sbox) = $this->_getTables();
        }

        return  $sbox[$word       & 0x000000FF]        |
               ($sbox[$word >>  8 & 0x000000FF] <<  8) |
               ($sbox[$word >> 16 & 0x000000FF] << 16) |
               ($sbox[$word >> 24 & 0x000000FF] << 24);
    }

    /**
     * Provides the mixColumns and sboxes tables
     *
     * @see Crypt_Rijndael:_encryptBlock()
     * @see Crypt_Rijndael:_setupInlineCrypt()
     * @see Crypt_Rijndael:_subWord()
     * @access private
     * @return array &$tables
     */
    function &_getTables()
    {
        static $tables;
        if (empty($tables)) {
            // according to  (section 5.2.1),
            // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so
            // those are the names we'll use.
            $t3 = array_map('intval', array(
                // with array_map('intval', ...) we ensure we have only int's and not
                // some slower floats converted by php automatically on high values
                0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491,
                0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC,
                0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB,
                0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B,
                0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83,
                0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A,
                0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F,
                0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA,
                0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B,
                0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713,
                0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6,
                0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85,
                0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411,
                0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B,
                0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1,
                0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF,
                0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E,
                0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6,
                0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B,
                0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD,
                0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8,
                0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2,
                0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049,
                0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810,
                0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197,
                0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F,
                0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C,
                0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927,
                0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733,
                0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5,
                0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0,
                0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
            ));

            foreach ($t3 as $t3i) {
                $t0[] = (($t3i << 24) & 0xFF000000) | (($t3i >>  8) & 0x00FFFFFF);
                $t1[] = (($t3i << 16) & 0xFFFF0000) | (($t3i >> 16) & 0x0000FFFF);
                $t2[] = (($t3i <<  8) & 0xFFFFFF00) | (($t3i >> 24) & 0x000000FF);
            }

            $tables = array(
                // The Precomputed mixColumns tables t0 - t3
                $t0,
                $t1,
                $t2,
                $t3,
                // The SubByte S-Box
                array(
                    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
                    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
                    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
                    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
                    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
                    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
                    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
                    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
                    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
                    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
                    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
                    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
                    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
                    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
                    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
                    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
                )
            );
        }
        return $tables;
    }

    /**
     * Provides the inverse mixColumns and inverse sboxes tables
     *
     * @see Crypt_Rijndael:_decryptBlock()
     * @see Crypt_Rijndael:_setupInlineCrypt()
     * @see Crypt_Rijndael:_setupKey()
     * @access private
     * @return array &$tables
     */
    function &_getInvTables()
    {
        static $tables;
        if (empty($tables)) {
            $dt3 = array_map('intval', array(
                0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B,
                0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5,
                0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B,
                0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E,
                0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D,
                0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9,
                0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66,
                0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED,
                0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4,
                0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD,
                0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60,
                0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79,
                0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C,
                0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24,
                0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C,
                0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814,
                0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B,
                0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084,
                0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077,
                0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22,
                0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F,
                0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582,
                0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB,
                0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF,
                0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035,
                0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17,
                0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46,
                0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D,
                0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A,
                0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678,
                0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF,
                0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
            ));

            foreach ($dt3 as $dt3i) {
                $dt0[] = (($dt3i << 24) & 0xFF000000) | (($dt3i >>  8) & 0x00FFFFFF);
                $dt1[] = (($dt3i << 16) & 0xFFFF0000) | (($dt3i >> 16) & 0x0000FFFF);
                $dt2[] = (($dt3i <<  8) & 0xFFFFFF00) | (($dt3i >> 24) & 0x000000FF);
            };

            $tables = array(
                // The Precomputed inverse mixColumns tables dt0 - dt3
                $dt0,
                $dt1,
                $dt2,
                $dt3,
                // The inverse SubByte S-Box
                array(
                    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
                    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
                    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
                    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
                    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
                    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
                    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
                    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
                    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
                    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
                    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
                    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
                    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
                    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
                    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
                    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
                )
            );
        }
        return $tables;
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * @see Crypt_Base::_setupInlineCrypt()
     * @access private
     */
    function _setupInlineCrypt()
    {
        // Note: _setupInlineCrypt() will be called only if $this->changed === true
        // So here we are'nt under the same heavy timing-stress as we are in _de/encryptBlock() or de/encrypt().
        // However...the here generated function- $code, stored as php callback in $this->inline_crypt, must work as fast as even possible.

        $lambda_functions =& Crypt_Rijndael::_getLambdaFunctions();

        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
        // (Currently, for Crypt_Rijndael/AES, one generated $lambda_function cost on php5.5@32bit ~80kb unfreeable mem and ~130kb on php5.5@64bit)
        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one.
        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);

        // Generation of a uniqe hash for our generated code
        $code_hash = "Crypt_Rijndael, {$this->mode}, {$this->Nr}, {$this->Nb}";
        if ($gen_hi_opt_code) {
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }

        if (!isset($lambda_functions[$code_hash])) {
            switch (true) {
                case $gen_hi_opt_code:
                    // The hi-optimized $lambda_functions will use the key-words hardcoded for better performance.
                    $w  = $this->w;
                    $dw = $this->dw;
                    $init_encrypt = '';
                    $init_decrypt = '';
                    break;
                default:
                    for ($i = 0, $cw = count($this->w); $i < $cw; ++$i) {
                        $w[]  = '$w['  . $i . ']';
                        $dw[] = '$dw[' . $i . ']';
                    }
                    $init_encrypt = '$w  = $self->w;';
                    $init_decrypt = '$dw = $self->dw;';
            }

            $Nr = $this->Nr;
            $Nb = $this->Nb;
            $c  = $this->c;

            // Generating encrypt code:
            $init_encrypt.= '
                static $tables;
                if (empty($tables)) {
                    $tables = &$self->_getTables();
                }
                $t0   = $tables[0];
                $t1   = $tables[1];
                $t2   = $tables[2];
                $t3   = $tables[3];
                $sbox = $tables[4];
            ';

            $s  = 'e';
            $e  = 's';
            $wc = $Nb - 1;

            // Preround: addRoundKey
            $encrypt_block = '$in = unpack("N*", $in);'."\n";
            for ($i = 0; $i < $Nb; ++$i) {
                $encrypt_block .= '$s'.$i.' = $in['.($i + 1).'] ^ '.$w[++$wc].";\n";
            }

            // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
            for ($round = 1; $round < $Nr; ++$round) {
                list($s, $e) = array($e, $s);
                for ($i = 0; $i < $Nb; ++$i) {
                    $encrypt_block.=
                        '$'.$e.$i.' =
                        $t0[($'.$s.$i                  .' >> 24) & 0xff] ^
                        $t1[($'.$s.(($i + $c[1]) % $Nb).' >> 16) & 0xff] ^
                        $t2[($'.$s.(($i + $c[2]) % $Nb).' >>  8) & 0xff] ^
                        $t3[ $'.$s.(($i + $c[3]) % $Nb).'        & 0xff] ^
                        '.$w[++$wc].";\n";
                }
            }

            // Finalround: subWord + shiftRows + addRoundKey
            for ($i = 0; $i < $Nb; ++$i) {
                $encrypt_block.=
                    '$'.$e.$i.' =
                     $sbox[ $'.$e.$i.'        & 0xff]        |
                    ($sbox[($'.$e.$i.' >>  8) & 0xff] <<  8) |
                    ($sbox[($'.$e.$i.' >> 16) & 0xff] << 16) |
                    ($sbox[($'.$e.$i.' >> 24) & 0xff] << 24);'."\n";
            }
            $encrypt_block .= '$in = pack("N*"'."\n";
            for ($i = 0; $i < $Nb; ++$i) {
                $encrypt_block.= ',
                    ($'.$e.$i                  .' & '.((int)0xFF000000).') ^
                    ($'.$e.(($i + $c[1]) % $Nb).' &         0x00FF0000   ) ^
                    ($'.$e.(($i + $c[2]) % $Nb).' &         0x0000FF00   ) ^
                    ($'.$e.(($i + $c[3]) % $Nb).' &         0x000000FF   ) ^
                    '.$w[$i]."\n";
            }
            $encrypt_block .= ');';

            // Generating decrypt code:
            $init_decrypt.= '
                static $invtables;
                if (empty($invtables)) {
                    $invtables = &$self->_getInvTables();
                }
                $dt0   = $invtables[0];
                $dt1   = $invtables[1];
                $dt2   = $invtables[2];
                $dt3   = $invtables[3];
                $isbox = $invtables[4];
            ';

            $s  = 'e';
            $e  = 's';
            $wc = $Nb - 1;

            // Preround: addRoundKey
            $decrypt_block = '$in = unpack("N*", $in);'."\n";
            for ($i = 0; $i < $Nb; ++$i) {
                $decrypt_block .= '$s'.$i.' = $in['.($i + 1).'] ^ '.$dw[++$wc].';'."\n";
            }

            // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
            for ($round = 1; $round < $Nr; ++$round) {
                list($s, $e) = array($e, $s);
                for ($i = 0; $i < $Nb; ++$i) {
                    $decrypt_block.=
                        '$'.$e.$i.' =
                        $dt0[($'.$s.$i                        .' >> 24) & 0xff] ^
                        $dt1[($'.$s.(($Nb + $i - $c[1]) % $Nb).' >> 16) & 0xff] ^
                        $dt2[($'.$s.(($Nb + $i - $c[2]) % $Nb).' >>  8) & 0xff] ^
                        $dt3[ $'.$s.(($Nb + $i - $c[3]) % $Nb).'        & 0xff] ^
                        '.$dw[++$wc].";\n";
                }
            }

            // Finalround: subWord + shiftRows + addRoundKey
            for ($i = 0; $i < $Nb; ++$i) {
                $decrypt_block.=
                    '$'.$e.$i.' =
                     $isbox[ $'.$e.$i.'        & 0xff]        |
                    ($isbox[($'.$e.$i.' >>  8) & 0xff] <<  8) |
                    ($isbox[($'.$e.$i.' >> 16) & 0xff] << 16) |
                    ($isbox[($'.$e.$i.' >> 24) & 0xff] << 24);'."\n";
            }
            $decrypt_block .= '$in = pack("N*"'."\n";
            for ($i = 0; $i < $Nb; ++$i) {
                $decrypt_block.= ',
                    ($'.$e.$i.                        ' & '.((int)0xFF000000).') ^
                    ($'.$e.(($Nb + $i - $c[1]) % $Nb).' &         0x00FF0000   ) ^
                    ($'.$e.(($Nb + $i - $c[2]) % $Nb).' &         0x0000FF00   ) ^
                    ($'.$e.(($Nb + $i - $c[3]) % $Nb).' &         0x000000FF   ) ^
                    '.$dw[$i]."\n";
            }
            $decrypt_block .= ');';

            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => '',
                   'init_encrypt'  => $init_encrypt,
                   'init_decrypt'  => $init_decrypt,
                   'encrypt_block' => $encrypt_block,
                   'decrypt_block' => $decrypt_block
                )
            );
        }
        $this->inline_crypt = $lambda_functions[$code_hash];
    }
}
phpseclib-1.0.18/phpseclib/Crypt/TripleDES.php000066400000000000000000000361321354156543400211470ustar00rootroot00000000000000
 * setKey('abcdefghijklmnopqrstuvwx');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $des->decrypt($des->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_TripleDES
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_DES
 */
if (!class_exists('Crypt_DES')) {
    include_once 'DES.php';
}

/**#@+
 * @access public
 * @see self::Crypt_TripleDES()
 */
/**
 * Encrypt / decrypt using inner chaining
 *
 * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (CRYPT_DES_MODE_CBC3).
 */
define('CRYPT_MODE_3CBC', -2);
/**
 * BC version of the above.
 */
define('CRYPT_DES_MODE_3CBC', -2);
/**
 * Encrypt / decrypt using outer chaining
 *
 * Outer chaining is used by SSH-2 and when the mode is set to CRYPT_DES_MODE_CBC.
 */
define('CRYPT_MODE_CBC3', CRYPT_MODE_CBC);
/**
 * BC version of the above.
 */
define('CRYPT_DES_MODE_CBC3', CRYPT_MODE_CBC3);
/**#@-*/

/**
 * Pure-PHP implementation of Triple DES.
 *
 * @package Crypt_TripleDES
 * @author  Jim Wigginton 
 * @access  public
 */
class Crypt_TripleDES extends Crypt_DES
{
    /**
     * Key Length (in bytes)
     *
     * @see Crypt_TripleDES::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 24;

    /**
     * The default salt used by setPassword()
     *
     * @see Crypt_Base::password_default_salt
     * @see Crypt_Base::setPassword()
     * @var string
     * @access private
     */
    var $password_default_salt = 'phpseclib';

    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_DES::const_namespace
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'DES';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_DES::cipher_name_mcrypt
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'tripledes';

    /**
     * Optimizing value while CFB-encrypting
     *
     * @see Crypt_Base::cfb_init_len
     * @var int
     * @access private
     */
    var $cfb_init_len = 750;

    /**
     * max possible size of $key
     *
     * @see self::setKey()
     * @see Crypt_DES::setKey()
     * @var string
     * @access private
     */
    var $key_length_max = 24;

    /**
     * Internal flag whether using CRYPT_DES_MODE_3CBC or not
     *
     * @var bool
     * @access private
     */
    var $mode_3cbc;

    /**
     * The Crypt_DES objects
     *
     * Used only if $mode_3cbc === true
     *
     * @var array
     * @access private
     */
    var $des;

    /**
     * Default Constructor.
     *
     * Determines whether or not the mcrypt extension should be used.
     *
     * $mode could be:
     *
     * - CRYPT_DES_MODE_ECB
     *
     * - CRYPT_DES_MODE_CBC
     *
     * - CRYPT_DES_MODE_CTR
     *
     * - CRYPT_DES_MODE_CFB
     *
     * - CRYPT_DES_MODE_OFB
     *
     * - CRYPT_DES_MODE_3CBC
     *
     * If not explicitly set, CRYPT_DES_MODE_CBC will be used.
     *
     * @see Crypt_DES::Crypt_DES()
     * @see Crypt_Base::Crypt_Base()
     * @param int $mode
     * @access public
     */
    function __construct($mode = CRYPT_MODE_CBC)
    {
        switch ($mode) {
            // In case of CRYPT_DES_MODE_3CBC, we init as CRYPT_DES_MODE_CBC
            // and additional flag us internally as 3CBC
            case CRYPT_DES_MODE_3CBC:
                parent::Crypt_Base(CRYPT_MODE_CBC);
                $this->mode_3cbc = true;

                // This three $des'es will do the 3CBC work (if $key > 64bits)
                $this->des = array(
                    new Crypt_DES(CRYPT_MODE_CBC),
                    new Crypt_DES(CRYPT_MODE_CBC),
                    new Crypt_DES(CRYPT_MODE_CBC),
                );

                // we're going to be doing the padding, ourselves, so disable it in the Crypt_DES objects
                $this->des[0]->disablePadding();
                $this->des[1]->disablePadding();
                $this->des[2]->disablePadding();
                break;
            // If not 3CBC, we init as usual
            default:
                parent::__construct($mode);
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param int $mode
     * @access public
     */
    function Crypt_TripleDES($mode = CRYPT_MODE_CBC)
    {
        $this->__construct($mode);
    }

    /**
     * Test for engine validity
     *
     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
     *
     * @see Crypt_Base::Crypt_Base()
     * @param int $engine
     * @access public
     * @return bool
     */
    function isValidEngine($engine)
    {
        if ($engine == CRYPT_ENGINE_OPENSSL) {
            $this->cipher_name_openssl_ecb = 'des-ede3';
            $mode = $this->_openssl_translate_mode();
            $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode;
        }

        return parent::isValidEngine($engine);
    }

    /**
     * Sets the initialization vector. (optional)
     *
     * SetIV is not required when CRYPT_DES_MODE_ECB is being used.  If not explicitly set, it'll be assumed
     * to be all zero's.
     *
     * @see Crypt_Base::setIV()
     * @access public
     * @param string $iv
     */
    function setIV($iv)
    {
        parent::setIV($iv);
        if ($this->mode_3cbc) {
            $this->des[0]->setIV($iv);
            $this->des[1]->setIV($iv);
            $this->des[2]->setIV($iv);
        }
    }

    /**
     * Sets the key length.
     *
     * Valid key lengths are 64, 128 and 192
     *
     * @see Crypt_Base:setKeyLength()
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        $length >>= 3;
        switch (true) {
            case $length <= 8:
                $this->key_length = 8;
                break;
            case $length <= 16:
                $this->key_length = 16;
                break;
            default:
                $this->key_length = 24;
        }

        parent::setKeyLength($length);
    }

    /**
     * Sets the key.
     *
     * Keys can be of any length.  Triple DES, itself, can use 128-bit (eg. strlen($key) == 16) or
     * 192-bit (eg. strlen($key) == 24) keys.  This function pads and truncates $key as appropriate.
     *
     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
     *
     * If the key is not explicitly set, it'll be assumed to be all null bytes.
     *
     * @access public
     * @see Crypt_DES::setKey()
     * @see Crypt_Base::setKey()
     * @param string $key
     */
    function setKey($key)
    {
        $length = $this->explicit_key_length ? $this->key_length : strlen($key);
        if ($length > 8) {
            $key = str_pad(substr($key, 0, 24), 24, chr(0));
            // if $key is between 64 and 128-bits, use the first 64-bits as the last, per this:
            // http://php.net/function.mcrypt-encrypt#47973
            $key = $length <= 16 ? substr_replace($key, substr($key, 0, 8), 16) : substr($key, 0, 24);
        } else {
            $key = str_pad($key, 8, chr(0));
        }
        parent::setKey($key);

        // And in case of CRYPT_DES_MODE_3CBC:
        // if key <= 64bits we not need the 3 $des to work,
        // because we will then act as regular DES-CBC with just a <= 64bit key.
        // So only if the key > 64bits (> 8 bytes) we will call setKey() for the 3 $des.
        if ($this->mode_3cbc && $length > 8) {
            $this->des[0]->setKey(substr($key,  0, 8));
            $this->des[1]->setKey(substr($key,  8, 8));
            $this->des[2]->setKey(substr($key, 16, 8));
        }
    }

    /**
     * Encrypts a message.
     *
     * @see Crypt_Base::encrypt()
     * @access public
     * @param string $plaintext
     * @return string $cipertext
     */
    function encrypt($plaintext)
    {
        // parent::en/decrypt() is able to do all the work for all modes and keylengths,
        // except for: CRYPT_MODE_3CBC (inner chaining CBC) with a key > 64bits

        // if the key is smaller then 8, do what we'd normally do
        if ($this->mode_3cbc && strlen($this->key) > 8) {
            return $this->des[2]->encrypt(
                $this->des[1]->decrypt(
                    $this->des[0]->encrypt(
                        $this->_pad($plaintext)
                    )
                )
            );
        }

        return parent::encrypt($plaintext);
    }

    /**
     * Decrypts a message.
     *
     * @see Crypt_Base::decrypt()
     * @access public
     * @param string $ciphertext
     * @return string $plaintext
     */
    function decrypt($ciphertext)
    {
        if ($this->mode_3cbc && strlen($this->key) > 8) {
            return $this->_unpad(
                $this->des[0]->decrypt(
                    $this->des[1]->encrypt(
                        $this->des[2]->decrypt(
                            str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, "\0")
                        )
                    )
                )
            );
        }

        return parent::decrypt($ciphertext);
    }

    /**
     * Treat consecutive "packets" as if they are a continuous buffer.
     *
     * Say you have a 16-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
     * will yield different outputs:
     *
     * 
     *    echo $des->encrypt(substr($plaintext, 0, 8));
     *    echo $des->encrypt(substr($plaintext, 8, 8));
     * 
     * 
     *    echo $des->encrypt($plaintext);
     * 
     *
     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
     * another, as demonstrated with the following:
     *
     * 
     *    $des->encrypt(substr($plaintext, 0, 8));
     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
     * 
     * 
     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
     * 
     *
     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
     *
     * Put another way, when the continuous buffer is enabled, the state of the Crypt_DES() object changes after each
     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
     * however, they are also less intuitive and more likely to cause you problems.
     *
     * @see Crypt_Base::enableContinuousBuffer()
     * @see self::disableContinuousBuffer()
     * @access public
     */
    function enableContinuousBuffer()
    {
        parent::enableContinuousBuffer();
        if ($this->mode_3cbc) {
            $this->des[0]->enableContinuousBuffer();
            $this->des[1]->enableContinuousBuffer();
            $this->des[2]->enableContinuousBuffer();
        }
    }

    /**
     * Treat consecutive packets as if they are a discontinuous buffer.
     *
     * The default behavior.
     *
     * @see Crypt_Base::disableContinuousBuffer()
     * @see self::enableContinuousBuffer()
     * @access public
     */
    function disableContinuousBuffer()
    {
        parent::disableContinuousBuffer();
        if ($this->mode_3cbc) {
            $this->des[0]->disableContinuousBuffer();
            $this->des[1]->disableContinuousBuffer();
            $this->des[2]->disableContinuousBuffer();
        }
    }

    /**
     * Creates the key schedule
     *
     * @see Crypt_DES::_setupKey()
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        switch (true) {
            // if $key <= 64bits we configure our internal pure-php cipher engine
            // to act as regular [1]DES, not as 3DES. mcrypt.so::tripledes does the same.
            case strlen($this->key) <= 8:
                $this->des_rounds = 1;
                break;

            // otherwise, if $key > 64bits, we configure our engine to work as 3DES.
            default:
                $this->des_rounds = 3;

                // (only) if 3CBC is used we have, of course, to setup the $des[0-2] keys also separately.
                if ($this->mode_3cbc) {
                    $this->des[0]->_setupKey();
                    $this->des[1]->_setupKey();
                    $this->des[2]->_setupKey();

                    // because $des[0-2] will, now, do all the work we can return here
                    // not need unnecessary stress parent::_setupKey() with our, now unused, $key.
                    return;
                }
        }
        // setup our key
        parent::_setupKey();
    }

    /**
     * Sets the internal crypt engine
     *
     * @see Crypt_Base::Crypt_Base()
     * @see Crypt_Base::setPreferredEngine()
     * @param int $engine
     * @access public
     * @return int
     */
    function setPreferredEngine($engine)
    {
        if ($this->mode_3cbc) {
            $this->des[0]->setPreferredEngine($engine);
            $this->des[1]->setPreferredEngine($engine);
            $this->des[2]->setPreferredEngine($engine);
        }

        return parent::setPreferredEngine($engine);
    }
}
phpseclib-1.0.18/phpseclib/Crypt/Twofish.php000066400000000000000000001167251354156543400210060ustar00rootroot00000000000000
 * setKey('12345678901234567890123456789012');
 *
 *    $plaintext = str_repeat('a', 1024);
 *
 *    echo $twofish->decrypt($twofish->encrypt($plaintext));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Crypt
 * @package   Crypt_Twofish
 * @author    Jim Wigginton 
 * @author    Hans-Juergen Petrich 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Crypt_Base
 *
 * Base cipher class
 */
if (!class_exists('Crypt_Base')) {
    include_once 'Base.php';
}

/**#@+
 * @access public
 * @see self::encrypt()
 * @see self::decrypt()
 */
/**
 * Encrypt / decrypt using the Counter mode.
 *
 * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
 */
define('CRYPT_TWOFISH_MODE_CTR', CRYPT_MODE_CTR);
/**
 * Encrypt / decrypt using the Electronic Code Book mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
 */
define('CRYPT_TWOFISH_MODE_ECB', CRYPT_MODE_ECB);
/**
 * Encrypt / decrypt using the Code Book Chaining mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
 */
define('CRYPT_TWOFISH_MODE_CBC', CRYPT_MODE_CBC);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
 */
define('CRYPT_TWOFISH_MODE_CFB', CRYPT_MODE_CFB);
/**
 * Encrypt / decrypt using the Cipher Feedback mode.
 *
 * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
 */
define('CRYPT_TWOFISH_MODE_OFB', CRYPT_MODE_OFB);
/**#@-*/

/**
 * Pure-PHP implementation of Twofish.
 *
 * @package Crypt_Twofish
 * @author  Jim Wigginton 
 * @author  Hans-Juergen Petrich 
 * @access  public
 */
class Crypt_Twofish extends Crypt_Base
{
    /**
     * The namespace used by the cipher for its constants.
     *
     * @see Crypt_Base::const_namespace
     * @var string
     * @access private
     */
    var $const_namespace = 'TWOFISH';

    /**
     * The mcrypt specific name of the cipher
     *
     * @see Crypt_Base::cipher_name_mcrypt
     * @var string
     * @access private
     */
    var $cipher_name_mcrypt = 'twofish';

    /**
     * Optimizing value while CFB-encrypting
     *
     * @see Crypt_Base::cfb_init_len
     * @var int
     * @access private
     */
    var $cfb_init_len = 800;

    /**
     * Q-Table
     *
     * @var array
     * @access private
     */
    var $q0 = array(
        0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76,
        0x9A, 0x92, 0x80, 0x78, 0xE4, 0xDD, 0xD1, 0x38,
        0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
        0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48,
        0xF2, 0xD0, 0x8B, 0x30, 0x84, 0x54, 0xDF, 0x23,
        0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
        0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C,
        0xA6, 0xEB, 0xA5, 0xBE, 0x16, 0x0C, 0xE3, 0x61,
        0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
        0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1,
        0xE1, 0xE6, 0xBD, 0x45, 0xE2, 0xF4, 0xB6, 0x66,
        0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
        0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA,
        0xEA, 0x77, 0x39, 0xAF, 0x33, 0xC9, 0x62, 0x71,
        0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
        0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7,
        0xA1, 0x1D, 0xAA, 0xED, 0x06, 0x70, 0xB2, 0xD2,
        0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
        0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB,
        0x9E, 0x9C, 0x52, 0x1B, 0x5F, 0x93, 0x0A, 0xEF,
        0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
        0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64,
        0x2A, 0xCE, 0xCB, 0x2F, 0xFC, 0x97, 0x05, 0x7A,
        0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
        0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02,
        0xB8, 0xDA, 0xB0, 0x17, 0x55, 0x1F, 0x8A, 0x7D,
        0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
        0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,
        0x6E, 0x50, 0xDE, 0x68, 0x65, 0xBC, 0xDB, 0xF8,
        0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
        0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00,
        0x6F, 0x9D, 0x36, 0x42, 0x4A, 0x5E, 0xC1, 0xE0
    );

    /**
     * Q-Table
     *
     * @var array
     * @access private
     */
    var $q1 = array(
        0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8,
        0x4A, 0xD3, 0xE6, 0x6B, 0x45, 0x7D, 0xE8, 0x4B,
        0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
        0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F,
        0x5E, 0xBA, 0xAE, 0x5B, 0x8A, 0x00, 0xBC, 0x9D,
        0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
        0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3,
        0xB2, 0x73, 0x4C, 0x54, 0x92, 0x74, 0x36, 0x51,
        0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
        0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C,
        0x13, 0x95, 0x9C, 0xC7, 0x24, 0x46, 0x3B, 0x70,
        0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
        0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC,
        0x03, 0x6F, 0x08, 0xBF, 0x40, 0xE7, 0x2B, 0xE2,
        0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
        0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17,
        0x66, 0x94, 0xA1, 0x1D, 0x3D, 0xF0, 0xDE, 0xB3,
        0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
        0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49,
        0x81, 0x88, 0xEE, 0x21, 0xC4, 0x1A, 0xEB, 0xD9,
        0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
        0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48,
        0x4F, 0xF2, 0x65, 0x8E, 0x78, 0x5C, 0x58, 0x19,
        0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
        0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5,
        0xCE, 0xE9, 0x68, 0x44, 0xE0, 0x4D, 0x43, 0x69,
        0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
        0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC,
        0x22, 0xC9, 0xC0, 0x9B, 0x89, 0xD4, 0xED, 0xAB,
        0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
        0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2,
        0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xBE, 0x91
    );

    /**
     * M-Table
     *
     * @var array
     * @access private
     */
    var $m0 = array(
        0xBCBC3275, 0xECEC21F3, 0x202043C6, 0xB3B3C9F4, 0xDADA03DB, 0x02028B7B, 0xE2E22BFB, 0x9E9EFAC8,
        0xC9C9EC4A, 0xD4D409D3, 0x18186BE6, 0x1E1E9F6B, 0x98980E45, 0xB2B2387D, 0xA6A6D2E8, 0x2626B74B,
        0x3C3C57D6, 0x93938A32, 0x8282EED8, 0x525298FD, 0x7B7BD437, 0xBBBB3771, 0x5B5B97F1, 0x474783E1,
        0x24243C30, 0x5151E20F, 0xBABAC6F8, 0x4A4AF31B, 0xBFBF4887, 0x0D0D70FA, 0xB0B0B306, 0x7575DE3F,
        0xD2D2FD5E, 0x7D7D20BA, 0x666631AE, 0x3A3AA35B, 0x59591C8A, 0x00000000, 0xCDCD93BC, 0x1A1AE09D,
        0xAEAE2C6D, 0x7F7FABC1, 0x2B2BC7B1, 0xBEBEB90E, 0xE0E0A080, 0x8A8A105D, 0x3B3B52D2, 0x6464BAD5,
        0xD8D888A0, 0xE7E7A584, 0x5F5FE807, 0x1B1B1114, 0x2C2CC2B5, 0xFCFCB490, 0x3131272C, 0x808065A3,
        0x73732AB2, 0x0C0C8173, 0x79795F4C, 0x6B6B4154, 0x4B4B0292, 0x53536974, 0x94948F36, 0x83831F51,
        0x2A2A3638, 0xC4C49CB0, 0x2222C8BD, 0xD5D5F85A, 0xBDBDC3FC, 0x48487860, 0xFFFFCE62, 0x4C4C0796,
        0x4141776C, 0xC7C7E642, 0xEBEB24F7, 0x1C1C1410, 0x5D5D637C, 0x36362228, 0x6767C027, 0xE9E9AF8C,
        0x4444F913, 0x1414EA95, 0xF5F5BB9C, 0xCFCF18C7, 0x3F3F2D24, 0xC0C0E346, 0x7272DB3B, 0x54546C70,
        0x29294CCA, 0xF0F035E3, 0x0808FE85, 0xC6C617CB, 0xF3F34F11, 0x8C8CE4D0, 0xA4A45993, 0xCACA96B8,
        0x68683BA6, 0xB8B84D83, 0x38382820, 0xE5E52EFF, 0xADAD569F, 0x0B0B8477, 0xC8C81DC3, 0x9999FFCC,
        0x5858ED03, 0x19199A6F, 0x0E0E0A08, 0x95957EBF, 0x70705040, 0xF7F730E7, 0x6E6ECF2B, 0x1F1F6EE2,
        0xB5B53D79, 0x09090F0C, 0x616134AA, 0x57571682, 0x9F9F0B41, 0x9D9D803A, 0x111164EA, 0x2525CDB9,
        0xAFAFDDE4, 0x4545089A, 0xDFDF8DA4, 0xA3A35C97, 0xEAEAD57E, 0x353558DA, 0xEDEDD07A, 0x4343FC17,
        0xF8F8CB66, 0xFBFBB194, 0x3737D3A1, 0xFAFA401D, 0xC2C2683D, 0xB4B4CCF0, 0x32325DDE, 0x9C9C71B3,
        0x5656E70B, 0xE3E3DA72, 0x878760A7, 0x15151B1C, 0xF9F93AEF, 0x6363BFD1, 0x3434A953, 0x9A9A853E,
        0xB1B1428F, 0x7C7CD133, 0x88889B26, 0x3D3DA65F, 0xA1A1D7EC, 0xE4E4DF76, 0x8181942A, 0x91910149,
        0x0F0FFB81, 0xEEEEAA88, 0x161661EE, 0xD7D77321, 0x9797F5C4, 0xA5A5A81A, 0xFEFE3FEB, 0x6D6DB5D9,
        0x7878AEC5, 0xC5C56D39, 0x1D1DE599, 0x7676A4CD, 0x3E3EDCAD, 0xCBCB6731, 0xB6B6478B, 0xEFEF5B01,
        0x12121E18, 0x6060C523, 0x6A6AB0DD, 0x4D4DF61F, 0xCECEE94E, 0xDEDE7C2D, 0x55559DF9, 0x7E7E5A48,
        0x2121B24F, 0x03037AF2, 0xA0A02665, 0x5E5E198E, 0x5A5A6678, 0x65654B5C, 0x62624E58, 0xFDFD4519,
        0x0606F48D, 0x404086E5, 0xF2F2BE98, 0x3333AC57, 0x17179067, 0x05058E7F, 0xE8E85E05, 0x4F4F7D64,
        0x89896AAF, 0x10109563, 0x74742FB6, 0x0A0A75FE, 0x5C5C92F5, 0x9B9B74B7, 0x2D2D333C, 0x3030D6A5,
        0x2E2E49CE, 0x494989E9, 0x46467268, 0x77775544, 0xA8A8D8E0, 0x9696044D, 0x2828BD43, 0xA9A92969,
        0xD9D97929, 0x8686912E, 0xD1D187AC, 0xF4F44A15, 0x8D8D1559, 0xD6D682A8, 0xB9B9BC0A, 0x42420D9E,
        0xF6F6C16E, 0x2F2FB847, 0xDDDD06DF, 0x23233934, 0xCCCC6235, 0xF1F1C46A, 0xC1C112CF, 0x8585EBDC,
        0x8F8F9E22, 0x7171A1C9, 0x9090F0C0, 0xAAAA539B, 0x0101F189, 0x8B8BE1D4, 0x4E4E8CED, 0x8E8E6FAB,
        0xABABA212, 0x6F6F3EA2, 0xE6E6540D, 0xDBDBF252, 0x92927BBB, 0xB7B7B602, 0x6969CA2F, 0x3939D9A9,
        0xD3D30CD7, 0xA7A72361, 0xA2A2AD1E, 0xC3C399B4, 0x6C6C4450, 0x07070504, 0x04047FF6, 0x272746C2,
        0xACACA716, 0xD0D07625, 0x50501386, 0xDCDCF756, 0x84841A55, 0xE1E15109, 0x7A7A25BE, 0x1313EF91
    );

    /**
     * M-Table
     *
     * @var array
     * @access private
     */
    var $m1 = array(
        0xA9D93939, 0x67901717, 0xB3719C9C, 0xE8D2A6A6, 0x04050707, 0xFD985252, 0xA3658080, 0x76DFE4E4,
        0x9A084545, 0x92024B4B, 0x80A0E0E0, 0x78665A5A, 0xE4DDAFAF, 0xDDB06A6A, 0xD1BF6363, 0x38362A2A,
        0x0D54E6E6, 0xC6432020, 0x3562CCCC, 0x98BEF2F2, 0x181E1212, 0xF724EBEB, 0xECD7A1A1, 0x6C774141,
        0x43BD2828, 0x7532BCBC, 0x37D47B7B, 0x269B8888, 0xFA700D0D, 0x13F94444, 0x94B1FBFB, 0x485A7E7E,
        0xF27A0303, 0xD0E48C8C, 0x8B47B6B6, 0x303C2424, 0x84A5E7E7, 0x54416B6B, 0xDF06DDDD, 0x23C56060,
        0x1945FDFD, 0x5BA33A3A, 0x3D68C2C2, 0x59158D8D, 0xF321ECEC, 0xAE316666, 0xA23E6F6F, 0x82165757,
        0x63951010, 0x015BEFEF, 0x834DB8B8, 0x2E918686, 0xD9B56D6D, 0x511F8383, 0x9B53AAAA, 0x7C635D5D,
        0xA63B6868, 0xEB3FFEFE, 0xA5D63030, 0xBE257A7A, 0x16A7ACAC, 0x0C0F0909, 0xE335F0F0, 0x6123A7A7,
        0xC0F09090, 0x8CAFE9E9, 0x3A809D9D, 0xF5925C5C, 0x73810C0C, 0x2C273131, 0x2576D0D0, 0x0BE75656,
        0xBB7B9292, 0x4EE9CECE, 0x89F10101, 0x6B9F1E1E, 0x53A93434, 0x6AC4F1F1, 0xB499C3C3, 0xF1975B5B,
        0xE1834747, 0xE66B1818, 0xBDC82222, 0x450E9898, 0xE26E1F1F, 0xF4C9B3B3, 0xB62F7474, 0x66CBF8F8,
        0xCCFF9999, 0x95EA1414, 0x03ED5858, 0x56F7DCDC, 0xD4E18B8B, 0x1C1B1515, 0x1EADA2A2, 0xD70CD3D3,
        0xFB2BE2E2, 0xC31DC8C8, 0x8E195E5E, 0xB5C22C2C, 0xE9894949, 0xCF12C1C1, 0xBF7E9595, 0xBA207D7D,
        0xEA641111, 0x77840B0B, 0x396DC5C5, 0xAF6A8989, 0x33D17C7C, 0xC9A17171, 0x62CEFFFF, 0x7137BBBB,
        0x81FB0F0F, 0x793DB5B5, 0x0951E1E1, 0xADDC3E3E, 0x242D3F3F, 0xCDA47676, 0xF99D5555, 0xD8EE8282,
        0xE5864040, 0xC5AE7878, 0xB9CD2525, 0x4D049696, 0x44557777, 0x080A0E0E, 0x86135050, 0xE730F7F7,
        0xA1D33737, 0x1D40FAFA, 0xAA346161, 0xED8C4E4E, 0x06B3B0B0, 0x706C5454, 0xB22A7373, 0xD2523B3B,
        0x410B9F9F, 0x7B8B0202, 0xA088D8D8, 0x114FF3F3, 0x3167CBCB, 0xC2462727, 0x27C06767, 0x90B4FCFC,
        0x20283838, 0xF67F0404, 0x60784848, 0xFF2EE5E5, 0x96074C4C, 0x5C4B6565, 0xB1C72B2B, 0xAB6F8E8E,
        0x9E0D4242, 0x9CBBF5F5, 0x52F2DBDB, 0x1BF34A4A, 0x5FA63D3D, 0x9359A4A4, 0x0ABCB9B9, 0xEF3AF9F9,
        0x91EF1313, 0x85FE0808, 0x49019191, 0xEE611616, 0x2D7CDEDE, 0x4FB22121, 0x8F42B1B1, 0x3BDB7272,
        0x47B82F2F, 0x8748BFBF, 0x6D2CAEAE, 0x46E3C0C0, 0xD6573C3C, 0x3E859A9A, 0x6929A9A9, 0x647D4F4F,
        0x2A948181, 0xCE492E2E, 0xCB17C6C6, 0x2FCA6969, 0xFCC3BDBD, 0x975CA3A3, 0x055EE8E8, 0x7AD0EDED,
        0xAC87D1D1, 0x7F8E0505, 0xD5BA6464, 0x1AA8A5A5, 0x4BB72626, 0x0EB9BEBE, 0xA7608787, 0x5AF8D5D5,
        0x28223636, 0x14111B1B, 0x3FDE7575, 0x2979D9D9, 0x88AAEEEE, 0x3C332D2D, 0x4C5F7979, 0x02B6B7B7,
        0xB896CACA, 0xDA583535, 0xB09CC4C4, 0x17FC4343, 0x551A8484, 0x1FF64D4D, 0x8A1C5959, 0x7D38B2B2,
        0x57AC3333, 0xC718CFCF, 0x8DF40606, 0x74695353, 0xB7749B9B, 0xC4F59797, 0x9F56ADAD, 0x72DAE3E3,
        0x7ED5EAEA, 0x154AF4F4, 0x229E8F8F, 0x12A2ABAB, 0x584E6262, 0x07E85F5F, 0x99E51D1D, 0x34392323,
        0x6EC1F6F6, 0x50446C6C, 0xDE5D3232, 0x68724646, 0x6526A0A0, 0xBC93CDCD, 0xDB03DADA, 0xF8C6BABA,
        0xC8FA9E9E, 0xA882D6D6, 0x2BCF6E6E, 0x40507070, 0xDCEB8585, 0xFE750A0A, 0x328A9393, 0xA48DDFDF,
        0xCA4C2929, 0x10141C1C, 0x2173D7D7, 0xF0CCB4B4, 0xD309D4D4, 0x5D108A8A, 0x0FE25151, 0x00000000,
        0x6F9A1919, 0x9DE01A1A, 0x368F9494, 0x42E6C7C7, 0x4AECC9C9, 0x5EFDD2D2, 0xC1AB7F7F, 0xE0D8A8A8
    );

    /**
     * M-Table
     *
     * @var array
     * @access private
     */
    var $m2 = array(
        0xBC75BC32, 0xECF3EC21, 0x20C62043, 0xB3F4B3C9, 0xDADBDA03, 0x027B028B, 0xE2FBE22B, 0x9EC89EFA,
        0xC94AC9EC, 0xD4D3D409, 0x18E6186B, 0x1E6B1E9F, 0x9845980E, 0xB27DB238, 0xA6E8A6D2, 0x264B26B7,
        0x3CD63C57, 0x9332938A, 0x82D882EE, 0x52FD5298, 0x7B377BD4, 0xBB71BB37, 0x5BF15B97, 0x47E14783,
        0x2430243C, 0x510F51E2, 0xBAF8BAC6, 0x4A1B4AF3, 0xBF87BF48, 0x0DFA0D70, 0xB006B0B3, 0x753F75DE,
        0xD25ED2FD, 0x7DBA7D20, 0x66AE6631, 0x3A5B3AA3, 0x598A591C, 0x00000000, 0xCDBCCD93, 0x1A9D1AE0,
        0xAE6DAE2C, 0x7FC17FAB, 0x2BB12BC7, 0xBE0EBEB9, 0xE080E0A0, 0x8A5D8A10, 0x3BD23B52, 0x64D564BA,
        0xD8A0D888, 0xE784E7A5, 0x5F075FE8, 0x1B141B11, 0x2CB52CC2, 0xFC90FCB4, 0x312C3127, 0x80A38065,
        0x73B2732A, 0x0C730C81, 0x794C795F, 0x6B546B41, 0x4B924B02, 0x53745369, 0x9436948F, 0x8351831F,
        0x2A382A36, 0xC4B0C49C, 0x22BD22C8, 0xD55AD5F8, 0xBDFCBDC3, 0x48604878, 0xFF62FFCE, 0x4C964C07,
        0x416C4177, 0xC742C7E6, 0xEBF7EB24, 0x1C101C14, 0x5D7C5D63, 0x36283622, 0x672767C0, 0xE98CE9AF,
        0x441344F9, 0x149514EA, 0xF59CF5BB, 0xCFC7CF18, 0x3F243F2D, 0xC046C0E3, 0x723B72DB, 0x5470546C,
        0x29CA294C, 0xF0E3F035, 0x088508FE, 0xC6CBC617, 0xF311F34F, 0x8CD08CE4, 0xA493A459, 0xCAB8CA96,
        0x68A6683B, 0xB883B84D, 0x38203828, 0xE5FFE52E, 0xAD9FAD56, 0x0B770B84, 0xC8C3C81D, 0x99CC99FF,
        0x580358ED, 0x196F199A, 0x0E080E0A, 0x95BF957E, 0x70407050, 0xF7E7F730, 0x6E2B6ECF, 0x1FE21F6E,
        0xB579B53D, 0x090C090F, 0x61AA6134, 0x57825716, 0x9F419F0B, 0x9D3A9D80, 0x11EA1164, 0x25B925CD,
        0xAFE4AFDD, 0x459A4508, 0xDFA4DF8D, 0xA397A35C, 0xEA7EEAD5, 0x35DA3558, 0xED7AEDD0, 0x431743FC,
        0xF866F8CB, 0xFB94FBB1, 0x37A137D3, 0xFA1DFA40, 0xC23DC268, 0xB4F0B4CC, 0x32DE325D, 0x9CB39C71,
        0x560B56E7, 0xE372E3DA, 0x87A78760, 0x151C151B, 0xF9EFF93A, 0x63D163BF, 0x345334A9, 0x9A3E9A85,
        0xB18FB142, 0x7C337CD1, 0x8826889B, 0x3D5F3DA6, 0xA1ECA1D7, 0xE476E4DF, 0x812A8194, 0x91499101,
        0x0F810FFB, 0xEE88EEAA, 0x16EE1661, 0xD721D773, 0x97C497F5, 0xA51AA5A8, 0xFEEBFE3F, 0x6DD96DB5,
        0x78C578AE, 0xC539C56D, 0x1D991DE5, 0x76CD76A4, 0x3EAD3EDC, 0xCB31CB67, 0xB68BB647, 0xEF01EF5B,
        0x1218121E, 0x602360C5, 0x6ADD6AB0, 0x4D1F4DF6, 0xCE4ECEE9, 0xDE2DDE7C, 0x55F9559D, 0x7E487E5A,
        0x214F21B2, 0x03F2037A, 0xA065A026, 0x5E8E5E19, 0x5A785A66, 0x655C654B, 0x6258624E, 0xFD19FD45,
        0x068D06F4, 0x40E54086, 0xF298F2BE, 0x335733AC, 0x17671790, 0x057F058E, 0xE805E85E, 0x4F644F7D,
        0x89AF896A, 0x10631095, 0x74B6742F, 0x0AFE0A75, 0x5CF55C92, 0x9BB79B74, 0x2D3C2D33, 0x30A530D6,
        0x2ECE2E49, 0x49E94989, 0x46684672, 0x77447755, 0xA8E0A8D8, 0x964D9604, 0x284328BD, 0xA969A929,
        0xD929D979, 0x862E8691, 0xD1ACD187, 0xF415F44A, 0x8D598D15, 0xD6A8D682, 0xB90AB9BC, 0x429E420D,
        0xF66EF6C1, 0x2F472FB8, 0xDDDFDD06, 0x23342339, 0xCC35CC62, 0xF16AF1C4, 0xC1CFC112, 0x85DC85EB,
        0x8F228F9E, 0x71C971A1, 0x90C090F0, 0xAA9BAA53, 0x018901F1, 0x8BD48BE1, 0x4EED4E8C, 0x8EAB8E6F,
        0xAB12ABA2, 0x6FA26F3E, 0xE60DE654, 0xDB52DBF2, 0x92BB927B, 0xB702B7B6, 0x692F69CA, 0x39A939D9,
        0xD3D7D30C, 0xA761A723, 0xA21EA2AD, 0xC3B4C399, 0x6C506C44, 0x07040705, 0x04F6047F, 0x27C22746,
        0xAC16ACA7, 0xD025D076, 0x50865013, 0xDC56DCF7, 0x8455841A, 0xE109E151, 0x7ABE7A25, 0x139113EF
    );

    /**
     * M-Table
     *
     * @var array
     * @access private
     */
    var $m3 = array(
        0xD939A9D9, 0x90176790, 0x719CB371, 0xD2A6E8D2, 0x05070405, 0x9852FD98, 0x6580A365, 0xDFE476DF,
        0x08459A08, 0x024B9202, 0xA0E080A0, 0x665A7866, 0xDDAFE4DD, 0xB06ADDB0, 0xBF63D1BF, 0x362A3836,
        0x54E60D54, 0x4320C643, 0x62CC3562, 0xBEF298BE, 0x1E12181E, 0x24EBF724, 0xD7A1ECD7, 0x77416C77,
        0xBD2843BD, 0x32BC7532, 0xD47B37D4, 0x9B88269B, 0x700DFA70, 0xF94413F9, 0xB1FB94B1, 0x5A7E485A,
        0x7A03F27A, 0xE48CD0E4, 0x47B68B47, 0x3C24303C, 0xA5E784A5, 0x416B5441, 0x06DDDF06, 0xC56023C5,
        0x45FD1945, 0xA33A5BA3, 0x68C23D68, 0x158D5915, 0x21ECF321, 0x3166AE31, 0x3E6FA23E, 0x16578216,
        0x95106395, 0x5BEF015B, 0x4DB8834D, 0x91862E91, 0xB56DD9B5, 0x1F83511F, 0x53AA9B53, 0x635D7C63,
        0x3B68A63B, 0x3FFEEB3F, 0xD630A5D6, 0x257ABE25, 0xA7AC16A7, 0x0F090C0F, 0x35F0E335, 0x23A76123,
        0xF090C0F0, 0xAFE98CAF, 0x809D3A80, 0x925CF592, 0x810C7381, 0x27312C27, 0x76D02576, 0xE7560BE7,
        0x7B92BB7B, 0xE9CE4EE9, 0xF10189F1, 0x9F1E6B9F, 0xA93453A9, 0xC4F16AC4, 0x99C3B499, 0x975BF197,
        0x8347E183, 0x6B18E66B, 0xC822BDC8, 0x0E98450E, 0x6E1FE26E, 0xC9B3F4C9, 0x2F74B62F, 0xCBF866CB,
        0xFF99CCFF, 0xEA1495EA, 0xED5803ED, 0xF7DC56F7, 0xE18BD4E1, 0x1B151C1B, 0xADA21EAD, 0x0CD3D70C,
        0x2BE2FB2B, 0x1DC8C31D, 0x195E8E19, 0xC22CB5C2, 0x8949E989, 0x12C1CF12, 0x7E95BF7E, 0x207DBA20,
        0x6411EA64, 0x840B7784, 0x6DC5396D, 0x6A89AF6A, 0xD17C33D1, 0xA171C9A1, 0xCEFF62CE, 0x37BB7137,
        0xFB0F81FB, 0x3DB5793D, 0x51E10951, 0xDC3EADDC, 0x2D3F242D, 0xA476CDA4, 0x9D55F99D, 0xEE82D8EE,
        0x8640E586, 0xAE78C5AE, 0xCD25B9CD, 0x04964D04, 0x55774455, 0x0A0E080A, 0x13508613, 0x30F7E730,
        0xD337A1D3, 0x40FA1D40, 0x3461AA34, 0x8C4EED8C, 0xB3B006B3, 0x6C54706C, 0x2A73B22A, 0x523BD252,
        0x0B9F410B, 0x8B027B8B, 0x88D8A088, 0x4FF3114F, 0x67CB3167, 0x4627C246, 0xC06727C0, 0xB4FC90B4,
        0x28382028, 0x7F04F67F, 0x78486078, 0x2EE5FF2E, 0x074C9607, 0x4B655C4B, 0xC72BB1C7, 0x6F8EAB6F,
        0x0D429E0D, 0xBBF59CBB, 0xF2DB52F2, 0xF34A1BF3, 0xA63D5FA6, 0x59A49359, 0xBCB90ABC, 0x3AF9EF3A,
        0xEF1391EF, 0xFE0885FE, 0x01914901, 0x6116EE61, 0x7CDE2D7C, 0xB2214FB2, 0x42B18F42, 0xDB723BDB,
        0xB82F47B8, 0x48BF8748, 0x2CAE6D2C, 0xE3C046E3, 0x573CD657, 0x859A3E85, 0x29A96929, 0x7D4F647D,
        0x94812A94, 0x492ECE49, 0x17C6CB17, 0xCA692FCA, 0xC3BDFCC3, 0x5CA3975C, 0x5EE8055E, 0xD0ED7AD0,
        0x87D1AC87, 0x8E057F8E, 0xBA64D5BA, 0xA8A51AA8, 0xB7264BB7, 0xB9BE0EB9, 0x6087A760, 0xF8D55AF8,
        0x22362822, 0x111B1411, 0xDE753FDE, 0x79D92979, 0xAAEE88AA, 0x332D3C33, 0x5F794C5F, 0xB6B702B6,
        0x96CAB896, 0x5835DA58, 0x9CC4B09C, 0xFC4317FC, 0x1A84551A, 0xF64D1FF6, 0x1C598A1C, 0x38B27D38,
        0xAC3357AC, 0x18CFC718, 0xF4068DF4, 0x69537469, 0x749BB774, 0xF597C4F5, 0x56AD9F56, 0xDAE372DA,
        0xD5EA7ED5, 0x4AF4154A, 0x9E8F229E, 0xA2AB12A2, 0x4E62584E, 0xE85F07E8, 0xE51D99E5, 0x39233439,
        0xC1F66EC1, 0x446C5044, 0x5D32DE5D, 0x72466872, 0x26A06526, 0x93CDBC93, 0x03DADB03, 0xC6BAF8C6,
        0xFA9EC8FA, 0x82D6A882, 0xCF6E2BCF, 0x50704050, 0xEB85DCEB, 0x750AFE75, 0x8A93328A, 0x8DDFA48D,
        0x4C29CA4C, 0x141C1014, 0x73D72173, 0xCCB4F0CC, 0x09D4D309, 0x108A5D10, 0xE2510FE2, 0x00000000,
        0x9A196F9A, 0xE01A9DE0, 0x8F94368F, 0xE6C742E6, 0xECC94AEC, 0xFDD25EFD, 0xAB7FC1AB, 0xD8A8E0D8
    );

    /**
     * The Key Schedule Array
     *
     * @var array
     * @access private
     */
    var $K = array();

    /**
     * The Key depended S-Table 0
     *
     * @var array
     * @access private
     */
    var $S0 = array();

    /**
     * The Key depended S-Table 1
     *
     * @var array
     * @access private
     */
    var $S1 = array();

    /**
     * The Key depended S-Table 2
     *
     * @var array
     * @access private
     */
    var $S2 = array();

    /**
     * The Key depended S-Table 3
     *
     * @var array
     * @access private
     */
    var $S3 = array();

    /**
     * Holds the last used key
     *
     * @var array
     * @access private
     */
    var $kl;

    /**
     * The Key Length (in bytes)
     *
     * @see Crypt_Twofish::setKeyLength()
     * @var int
     * @access private
     */
    var $key_length = 16;

    /**
     * Sets the key length.
     *
     * Valid key lengths are 128, 192 or 256 bits
     *
     * @access public
     * @param int $length
     */
    function setKeyLength($length)
    {
        switch (true) {
            case $length <= 128:
                $this->key_length = 16;
                break;
            case $length <= 192:
                $this->key_length = 24;
                break;
            default:
                $this->key_length = 32;
        }

        parent::setKeyLength($length);
    }

    /**
     * Setup the key (expansion)
     *
     * @see Crypt_Base::_setupKey()
     * @access private
     */
    function _setupKey()
    {
        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
            // already expanded
            return;
        }
        $this->kl = array('key' => $this->key);

        /* Key expanding and generating the key-depended s-boxes */
        $le_longs = unpack('V*', $this->key);
        $key = unpack('C*', $this->key);
        $m0 = $this->m0;
        $m1 = $this->m1;
        $m2 = $this->m2;
        $m3 = $this->m3;
        $q0 = $this->q0;
        $q1 = $this->q1;

        $K = $S0 = $S1 = $S2 = $S3 = array();

        switch (strlen($this->key)) {
            case 16:
                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[1], $le_longs[2]);
                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[3], $le_longs[4]);
                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
                    $A = $m0[$q0[$q0[$i] ^ $key[ 9]] ^ $key[1]] ^
                         $m1[$q0[$q1[$i] ^ $key[10]] ^ $key[2]] ^
                         $m2[$q1[$q0[$i] ^ $key[11]] ^ $key[3]] ^
                         $m3[$q1[$q1[$i] ^ $key[12]] ^ $key[4]];
                    $B = $m0[$q0[$q0[$j] ^ $key[13]] ^ $key[5]] ^
                         $m1[$q0[$q1[$j] ^ $key[14]] ^ $key[6]] ^
                         $m2[$q1[$q0[$j] ^ $key[15]] ^ $key[7]] ^
                         $m3[$q1[$q1[$j] ^ $key[16]] ^ $key[8]];
                    $B = ($B << 8) | ($B >> 24 & 0xff);
                    $A = $this->safe_intval($A + $B);
                    $K[] = $A;
                    $A = $this->safe_intval($A + $B);
                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
                }
                for ($i = 0; $i < 256; ++$i) {
                    $S0[$i] = $m0[$q0[$q0[$i] ^ $s4] ^ $s0];
                    $S1[$i] = $m1[$q0[$q1[$i] ^ $s5] ^ $s1];
                    $S2[$i] = $m2[$q1[$q0[$i] ^ $s6] ^ $s2];
                    $S3[$i] = $m3[$q1[$q1[$i] ^ $s7] ^ $s3];
                }
                break;
            case 24:
                list($sb, $sa, $s9, $s8) = $this->_mdsrem($le_longs[1], $le_longs[2]);
                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[3], $le_longs[4]);
                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[5], $le_longs[6]);
                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
                    $A = $m0[$q0[$q0[$q1[$i] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
                         $m1[$q0[$q1[$q1[$i] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
                         $m2[$q1[$q0[$q0[$i] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
                         $m3[$q1[$q1[$q0[$i] ^ $key[20]] ^ $key[12]] ^ $key[4]];
                    $B = $m0[$q0[$q0[$q1[$j] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
                         $m1[$q0[$q1[$q1[$j] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
                         $m2[$q1[$q0[$q0[$j] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
                         $m3[$q1[$q1[$q0[$j] ^ $key[24]] ^ $key[16]] ^ $key[8]];
                    $B = ($B << 8) | ($B >> 24 & 0xff);
                    $A = $this->safe_intval($A + $B);
                    $K[] = $A;
                    $A = $this->safe_intval($A + $B);
                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
                }
                for ($i = 0; $i < 256; ++$i) {
                    $S0[$i] = $m0[$q0[$q0[$q1[$i] ^ $s8] ^ $s4] ^ $s0];
                    $S1[$i] = $m1[$q0[$q1[$q1[$i] ^ $s9] ^ $s5] ^ $s1];
                    $S2[$i] = $m2[$q1[$q0[$q0[$i] ^ $sa] ^ $s6] ^ $s2];
                    $S3[$i] = $m3[$q1[$q1[$q0[$i] ^ $sb] ^ $s7] ^ $s3];
                }
                break;
            default: // 32
                list($sf, $se, $sd, $sc) = $this->_mdsrem($le_longs[1], $le_longs[2]);
                list($sb, $sa, $s9, $s8) = $this->_mdsrem($le_longs[3], $le_longs[4]);
                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[5], $le_longs[6]);
                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[7], $le_longs[8]);
                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
                    $A = $m0[$q0[$q0[$q1[$q1[$i] ^ $key[25]] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
                         $m1[$q0[$q1[$q1[$q0[$i] ^ $key[26]] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
                         $m2[$q1[$q0[$q0[$q0[$i] ^ $key[27]] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
                         $m3[$q1[$q1[$q0[$q1[$i] ^ $key[28]] ^ $key[20]] ^ $key[12]] ^ $key[4]];
                    $B = $m0[$q0[$q0[$q1[$q1[$j] ^ $key[29]] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
                         $m1[$q0[$q1[$q1[$q0[$j] ^ $key[30]] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
                         $m2[$q1[$q0[$q0[$q0[$j] ^ $key[31]] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
                         $m3[$q1[$q1[$q0[$q1[$j] ^ $key[32]] ^ $key[24]] ^ $key[16]] ^ $key[8]];
                    $B = ($B << 8) | ($B >> 24 & 0xff);
                    $A = $this->safe_intval($A + $B);
                    $K[] = $A;
                    $A = $this->safe_intval($A + $B);
                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
                }
                for ($i = 0; $i < 256; ++$i) {
                    $S0[$i] = $m0[$q0[$q0[$q1[$q1[$i] ^ $sc] ^ $s8] ^ $s4] ^ $s0];
                    $S1[$i] = $m1[$q0[$q1[$q1[$q0[$i] ^ $sd] ^ $s9] ^ $s5] ^ $s1];
                    $S2[$i] = $m2[$q1[$q0[$q0[$q0[$i] ^ $se] ^ $sa] ^ $s6] ^ $s2];
                    $S3[$i] = $m3[$q1[$q1[$q0[$q1[$i] ^ $sf] ^ $sb] ^ $s7] ^ $s3];
                }
        }

        $this->K  = $K;
        $this->S0 = $S0;
        $this->S1 = $S1;
        $this->S2 = $S2;
        $this->S3 = $S3;
    }

    /**
     * _mdsrem function using by the twofish cipher algorithm
     *
     * @access private
     * @param string $A
     * @param string $B
     * @return array
     */
    function _mdsrem($A, $B)
    {
        // No gain by unrolling this loop.
        for ($i = 0; $i < 8; ++$i) {
            // Get most significant coefficient.
            $t = 0xff & ($B >> 24);

            // Shift the others up.
            $B = ($B << 8) | (0xff & ($A >> 24));
            $A<<= 8;

            $u = $t << 1;

            // Subtract the modular polynomial on overflow.
            if ($t & 0x80) {
                $u^= 0x14d;
            }

            // Remove t * (a * x^2 + 1).
            $B ^= $t ^ ($u << 16);

            // Form u = a*t + t/a = t*(a + 1/a).
            $u^= 0x7fffffff & ($t >> 1);

            // Add the modular polynomial on underflow.
            if ($t & 0x01) {
                $u^= 0xa6 ;
            }

            // Remove t * (a + 1/a) * (x^3 + x).
            $B^= ($u << 24) | ($u << 8);
        }

        return array(
            0xff & $B >> 24,
            0xff & $B >> 16,
            0xff & $B >>  8,
            0xff & $B);
    }

    /**
     * Encrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _encryptBlock($in)
    {
        $S0 = $this->S0;
        $S1 = $this->S1;
        $S2 = $this->S2;
        $S3 = $this->S3;
        $K  = $this->K;

        $in = unpack("V4", $in);
        $R0 = $K[0] ^ $in[1];
        $R1 = $K[1] ^ $in[2];
        $R2 = $K[2] ^ $in[3];
        $R3 = $K[3] ^ $in[4];

        $ki = 7;
        while ($ki < 39) {
            $t0 = $S0[ $R0        & 0xff] ^
                  $S1[($R0 >>  8) & 0xff] ^
                  $S2[($R0 >> 16) & 0xff] ^
                  $S3[($R0 >> 24) & 0xff];
            $t1 = $S0[($R1 >> 24) & 0xff] ^
                  $S1[ $R1        & 0xff] ^
                  $S2[($R1 >>  8) & 0xff] ^
                  $S3[($R1 >> 16) & 0xff];
            $R2^= $this->safe_intval($t0 + $t1 + $K[++$ki]);
            $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
            $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ $this->safe_intval($t0 + ($t1 << 1) + $K[++$ki]);

            $t0 = $S0[ $R2        & 0xff] ^
                  $S1[($R2 >>  8) & 0xff] ^
                  $S2[($R2 >> 16) & 0xff] ^
                  $S3[($R2 >> 24) & 0xff];
            $t1 = $S0[($R3 >> 24) & 0xff] ^
                  $S1[ $R3        & 0xff] ^
                  $S2[($R3 >>  8) & 0xff] ^
                  $S3[($R3 >> 16) & 0xff];
            $R0^= $this->safe_intval($t0 + $t1 + $K[++$ki]);
            $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
            $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ $this->safe_intval($t0 + ($t1 << 1) + $K[++$ki]);
        }

        // @codingStandardsIgnoreStart
        return pack("V4", $K[4] ^ $R2,
                          $K[5] ^ $R3,
                          $K[6] ^ $R0,
                          $K[7] ^ $R1);
        // @codingStandardsIgnoreEnd
    }

    /**
     * Decrypts a block
     *
     * @access private
     * @param string $in
     * @return string
     */
    function _decryptBlock($in)
    {
        $S0 = $this->S0;
        $S1 = $this->S1;
        $S2 = $this->S2;
        $S3 = $this->S3;
        $K  = $this->K;

        $in = unpack("V4", $in);
        $R0 = $K[4] ^ $in[1];
        $R1 = $K[5] ^ $in[2];
        $R2 = $K[6] ^ $in[3];
        $R3 = $K[7] ^ $in[4];

        $ki = 40;
        while ($ki > 8) {
            $t0 = $S0[$R0       & 0xff] ^
                  $S1[$R0 >>  8 & 0xff] ^
                  $S2[$R0 >> 16 & 0xff] ^
                  $S3[$R0 >> 24 & 0xff];
            $t1 = $S0[$R1 >> 24 & 0xff] ^
                  $S1[$R1       & 0xff] ^
                  $S2[$R1 >>  8 & 0xff] ^
                  $S3[$R1 >> 16 & 0xff];
            $R3^= $this->safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
            $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
            $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ $this->safe_intval($t0 + $t1 + $K[--$ki]);

            $t0 = $S0[$R2       & 0xff] ^
                  $S1[$R2 >>  8 & 0xff] ^
                  $S2[$R2 >> 16 & 0xff] ^
                  $S3[$R2 >> 24 & 0xff];
            $t1 = $S0[$R3 >> 24 & 0xff] ^
                  $S1[$R3       & 0xff] ^
                  $S2[$R3 >>  8 & 0xff] ^
                  $S3[$R3 >> 16 & 0xff];
            $R1^= $this->safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
            $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
            $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ $this->safe_intval($t0 + $t1 + $K[--$ki]);
        }

        // @codingStandardsIgnoreStart
        return pack("V4", $K[0] ^ $R2,
                          $K[1] ^ $R3,
                          $K[2] ^ $R0,
                          $K[3] ^ $R1);
        // @codingStandardsIgnoreEnd
    }

    /**
     * Setup the performance-optimized function for de/encrypt()
     *
     * @see Crypt_Base::_setupInlineCrypt()
     * @access private
     */
    function _setupInlineCrypt()
    {
        $lambda_functions =& Crypt_Twofish::_getLambdaFunctions();

        // Max. 10 Ultra-Hi-optimized inline-crypt functions. After that, we'll (still) create very fast code, but not the ultimate fast one.
        // (Currently, for Crypt_Twofish, one generated $lambda_function cost on php5.5@32bit ~140kb unfreeable mem and ~240kb on php5.5@64bit)
        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);

        // Generation of a unique hash for our generated code
        $code_hash = "Crypt_Twofish, {$this->mode}";
        if ($gen_hi_opt_code) {
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }

        $safeint = $this->safe_intval_inline();

        if (!isset($lambda_functions[$code_hash])) {
            switch (true) {
                case $gen_hi_opt_code:
                    $K = $this->K;
                    $init_crypt = '
                        static $S0, $S1, $S2, $S3;
                        if (!$S0) {
                            for ($i = 0; $i < 256; ++$i) {
                                $S0[] = (int)$self->S0[$i];
                                $S1[] = (int)$self->S1[$i];
                                $S2[] = (int)$self->S2[$i];
                                $S3[] = (int)$self->S3[$i];
                            }
                        }
                    ';
                    break;
                default:
                    $K   = array();
                    for ($i = 0; $i < 40; ++$i) {
                        $K[] = '$K_' . $i;
                    }
                    $init_crypt = '
                        $S0 = $self->S0;
                        $S1 = $self->S1;
                        $S2 = $self->S2;
                        $S3 = $self->S3;
                        list(' . implode(',', $K) . ') = $self->K;
                    ';
            }

            // Generating encrypt code:
            $encrypt_block = '
                $in = unpack("V4", $in);
                $R0 = '.$K[0].' ^ $in[1];
                $R1 = '.$K[1].' ^ $in[2];
                $R2 = '.$K[2].' ^ $in[3];
                $R3 = '.$K[3].' ^ $in[4];
            ';
            for ($ki = 7, $i = 0; $i < 8; ++$i) {
                $encrypt_block.= '
                    $t0 = $S0[ $R0        & 0xff] ^
                          $S1[($R0 >>  8) & 0xff] ^
                          $S2[($R0 >> 16) & 0xff] ^
                          $S3[($R0 >> 24) & 0xff];
                    $t1 = $S0[($R1 >> 24) & 0xff] ^
                          $S1[ $R1        & 0xff] ^
                          $S2[($R1 >>  8) & 0xff] ^
                          $S3[($R1 >> 16) & 0xff];
                    $R2^= ' . sprintf($safeint, '$t0 + $t1 + ' . $K[++$ki]) . ';
                    $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
                    $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';

                    $t0 = $S0[ $R2        & 0xff] ^
                          $S1[($R2 >>  8) & 0xff] ^
                          $S2[($R2 >> 16) & 0xff] ^
                          $S3[($R2 >> 24) & 0xff];
                    $t1 = $S0[($R3 >> 24) & 0xff] ^
                          $S1[ $R3        & 0xff] ^
                          $S2[($R3 >>  8) & 0xff] ^
                          $S3[($R3 >> 16) & 0xff];
                    $R0^= ' . sprintf($safeint, '($t0 + $t1 + ' . $K[++$ki] . ')') . ';
                    $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
                    $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';
                ';
            }
            $encrypt_block.= '
                $in = pack("V4", ' . $K[4] . ' ^ $R2,
                                 ' . $K[5] . ' ^ $R3,
                                 ' . $K[6] . ' ^ $R0,
                                 ' . $K[7] . ' ^ $R1);
            ';

            // Generating decrypt code:
            $decrypt_block = '
                $in = unpack("V4", $in);
                $R0 = '.$K[4].' ^ $in[1];
                $R1 = '.$K[5].' ^ $in[2];
                $R2 = '.$K[6].' ^ $in[3];
                $R3 = '.$K[7].' ^ $in[4];
            ';
            for ($ki = 40, $i = 0; $i < 8; ++$i) {
                $decrypt_block.= '
                    $t0 = $S0[$R0       & 0xff] ^
                          $S1[$R0 >>  8 & 0xff] ^
                          $S2[$R0 >> 16 & 0xff] ^
                          $S3[$R0 >> 24 & 0xff];
                    $t1 = $S0[$R1 >> 24 & 0xff] ^
                          $S1[$R1       & 0xff] ^
                          $S2[$R1 >>  8 & 0xff] ^
                          $S3[$R1 >> 16 & 0xff];
                    $R3^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
                    $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
                    $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + '.$K[--$ki] . ')') . ';

                    $t0 = $S0[$R2       & 0xff] ^
                          $S1[$R2 >>  8 & 0xff] ^
                          $S2[$R2 >> 16 & 0xff] ^
                          $S3[$R2 >> 24 & 0xff];
                    $t1 = $S0[$R3 >> 24 & 0xff] ^
                          $S1[$R3       & 0xff] ^
                          $S2[$R3 >>  8 & 0xff] ^
                          $S3[$R3 >> 16 & 0xff];
                    $R1^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
                    $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
                    $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + '.$K[--$ki] . ')') . ';
                ';
            }
            $decrypt_block.= '
                $in = pack("V4", ' . $K[0] . ' ^ $R2,
                                 ' . $K[1] . ' ^ $R3,
                                 ' . $K[2] . ' ^ $R0,
                                 ' . $K[3] . ' ^ $R1);
            ';

            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => $init_crypt,
                   'init_encrypt'  => '',
                   'init_decrypt'  => '',
                   'encrypt_block' => $encrypt_block,
                   'decrypt_block' => $decrypt_block
                )
            );
        }
        $this->inline_crypt = $lambda_functions[$code_hash];
    }
}
phpseclib-1.0.18/phpseclib/File/000077500000000000000000000000001354156543400164145ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/File/ANSI.php000066400000000000000000000520061354156543400176620ustar00rootroot00000000000000
 * @copyright 2012 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Pure-PHP ANSI Decoder
 *
 * @package File_ANSI
 * @author  Jim Wigginton 
 * @access  public
 */
class File_ANSI
{
    /**
     * Max Width
     *
     * @var int
     * @access private
     */
    var $max_x;

    /**
     * Max Height
     *
     * @var int
     * @access private
     */
    var $max_y;

    /**
     * Max History
     *
     * @var int
     * @access private
     */
    var $max_history;

    /**
     * History
     *
     * @var array
     * @access private
     */
    var $history;

    /**
     * History Attributes
     *
     * @var array
     * @access private
     */
    var $history_attrs;

    /**
     * Current Column
     *
     * @var int
     * @access private
     */
    var $x;

    /**
     * Current Row
     *
     * @var int
     * @access private
     */
    var $y;

    /**
     * Old Column
     *
     * @var int
     * @access private
     */
    var $old_x;

    /**
     * Old Row
     *
     * @var int
     * @access private
     */
    var $old_y;

    /**
     * An empty attribute cell
     *
     * @var object
     * @access private
     */
    var $base_attr_cell;

    /**
     * The current attribute cell
     *
     * @var object
     * @access private
     */
    var $attr_cell;

    /**
     * An empty attribute row
     *
     * @var array
     * @access private
     */
    var $attr_row;

    /**
     * The current screen text
     *
     * @var array
     * @access private
     */
    var $screen;

    /**
     * The current screen attributes
     *
     * @var array
     * @access private
     */
    var $attrs;

    /**
     * Current ANSI code
     *
     * @var string
     * @access private
     */
    var $ansi;

    /**
     * Tokenization
     *
     * @var array
     * @access private
     */
    var $tokenization;

    /**
     * Default Constructor.
     *
     * @return File_ANSI
     * @access public
     */
    function __construct()
    {
        $attr_cell = new stdClass();
        $attr_cell->bold = false;
        $attr_cell->underline = false;
        $attr_cell->blink = false;
        $attr_cell->background = 'black';
        $attr_cell->foreground = 'white';
        $attr_cell->reverse = false;
        $this->base_attr_cell = clone($attr_cell);
        $this->attr_cell = clone($attr_cell);

        $this->setHistory(200);
        $this->setDimensions(80, 24);
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function File_ANSI()
    {
        $this->__construct($mode);
    }

    /**
     * Set terminal width and height
     *
     * Resets the screen as well
     *
     * @param int $x
     * @param int $y
     * @access public
     */
    function setDimensions($x, $y)
    {
        $this->max_x = $x - 1;
        $this->max_y = $y - 1;
        $this->x = $this->y = 0;
        $this->history = $this->history_attrs = array();
        $this->attr_row = array_fill(0, $this->max_x + 2, $this->base_attr_cell);
        $this->screen = array_fill(0, $this->max_y + 1, '');
        $this->attrs = array_fill(0, $this->max_y + 1, $this->attr_row);
        $this->ansi = '';
    }

    /**
     * Set the number of lines that should be logged past the terminal height
     *
     * @param int $x
     * @param int $y
     * @access public
     */
    function setHistory($history)
    {
        $this->max_history = $history;
    }

    /**
     * Load a string
     *
     * @param string $source
     * @access public
     */
    function loadString($source)
    {
        $this->setDimensions($this->max_x + 1, $this->max_y + 1);
        $this->appendString($source);
    }

    /**
     * Appdend a string
     *
     * @param string $source
     * @access public
     */
    function appendString($source)
    {
        $this->tokenization = array('');
        for ($i = 0; $i < strlen($source); $i++) {
            if (strlen($this->ansi)) {
                $this->ansi.= $source[$i];
                $chr = ord($source[$i]);
                // http://en.wikipedia.org/wiki/ANSI_escape_code#Sequence_elements
                // single character CSI's not currently supported
                switch (true) {
                    case $this->ansi == "\x1B=":
                        $this->ansi = '';
                        continue 2;
                    case strlen($this->ansi) == 2 && $chr >= 64 && $chr <= 95 && $chr != ord('['):
                    case strlen($this->ansi) > 2 && $chr >= 64 && $chr <= 126:
                        break;
                    default:
                        continue 2;
                }
                $this->tokenization[] = $this->ansi;
                $this->tokenization[] = '';
                // http://ascii-table.com/ansi-escape-sequences-vt-100.php
                switch ($this->ansi) {
                    case "\x1B[H": // Move cursor to upper left corner
                        $this->old_x = $this->x;
                        $this->old_y = $this->y;
                        $this->x = $this->y = 0;
                        break;
                    case "\x1B[J": // Clear screen from cursor down
                        $this->history = array_merge($this->history, array_slice(array_splice($this->screen, $this->y + 1), 0, $this->old_y));
                        $this->screen = array_merge($this->screen, array_fill($this->y, $this->max_y, ''));

                        $this->history_attrs = array_merge($this->history_attrs, array_slice(array_splice($this->attrs, $this->y + 1), 0, $this->old_y));
                        $this->attrs = array_merge($this->attrs, array_fill($this->y, $this->max_y, $this->attr_row));

                        if (count($this->history) == $this->max_history) {
                            array_shift($this->history);
                            array_shift($this->history_attrs);
                        }
                    case "\x1B[K": // Clear screen from cursor right
                        $this->screen[$this->y] = substr($this->screen[$this->y], 0, $this->x);

                        array_splice($this->attrs[$this->y], $this->x + 1, $this->max_x - $this->x, array_fill($this->x, $this->max_x - $this->x - 1, $this->base_attr_cell));
                        break;
                    case "\x1B[2K": // Clear entire line
                        $this->screen[$this->y] = str_repeat(' ', $this->x);
                        $this->attrs[$this->y] = $this->attr_row;
                        break;
                    case "\x1B[?1h": // set cursor key to application
                    case "\x1B[?25h": // show the cursor
                    case "\x1B(B": // set united states g0 character set
                        break;
                    case "\x1BE": // Move to next line
                        $this->_newLine();
                        $this->x = 0;
                        break;
                    default:
                        switch (true) {
                            case preg_match('#\x1B\[(\d+)B#', $this->ansi, $match): // Move cursor down n lines
                                $this->old_y = $this->y;
                                $this->y+= $match[1];
                                break;
                            case preg_match('#\x1B\[(\d+);(\d+)H#', $this->ansi, $match): // Move cursor to screen location v,h
                                $this->old_x = $this->x;
                                $this->old_y = $this->y;
                                $this->x = $match[2] - 1;
                                $this->y = $match[1] - 1;
                                break;
                            case preg_match('#\x1B\[(\d+)C#', $this->ansi, $match): // Move cursor right n lines
                                $this->old_x = $this->x;
                                $this->x+= $match[1];
                                break;
                            case preg_match('#\x1B\[(\d+)D#', $this->ansi, $match): // Move cursor left n lines
                                $this->old_x = $this->x;
                                $this->x-= $match[1];
                                if ($this->x < 0) {
                                    $this->x = 0;
                                }
                                break;
                            case preg_match('#\x1B\[(\d+);(\d+)r#', $this->ansi, $match): // Set top and bottom lines of a window
                                break;
                            case preg_match('#\x1B\[(\d*(?:;\d*)*)m#', $this->ansi, $match): // character attributes
                                $attr_cell = &$this->attr_cell;
                                $mods = explode(';', $match[1]);
                                foreach ($mods as $mod) {
                                    switch ($mod) {
                                        case 0: // Turn off character attributes
                                            $attr_cell = clone($this->base_attr_cell);
                                            break;
                                        case 1: // Turn bold mode on
                                            $attr_cell->bold = true;
                                            break;
                                        case 4: // Turn underline mode on
                                            $attr_cell->underline = true;
                                            break;
                                        case 5: // Turn blinking mode on
                                            $attr_cell->blink = true;
                                            break;
                                        case 7: // Turn reverse video on
                                            $attr_cell->reverse = !$attr_cell->reverse;
                                            $temp = $attr_cell->background;
                                            $attr_cell->background = $attr_cell->foreground;
                                            $attr_cell->foreground = $temp;
                                            break;
                                        default: // set colors
                                            //$front = $attr_cell->reverse ? &$attr_cell->background : &$attr_cell->foreground;
                                            $front = &$attr_cell->{ $attr_cell->reverse ? 'background' : 'foreground' };
                                            //$back = $attr_cell->reverse ? &$attr_cell->foreground : &$attr_cell->background;
                                            $back = &$attr_cell->{ $attr_cell->reverse ? 'foreground' : 'background' };
                                            switch ($mod) {
                                                // @codingStandardsIgnoreStart
                                                case 30: $front = 'black'; break;
                                                case 31: $front = 'red'; break;
                                                case 32: $front = 'green'; break;
                                                case 33: $front = 'yellow'; break;
                                                case 34: $front = 'blue'; break;
                                                case 35: $front = 'magenta'; break;
                                                case 36: $front = 'cyan'; break;
                                                case 37: $front = 'white'; break;

                                                case 40: $back = 'black'; break;
                                                case 41: $back = 'red'; break;
                                                case 42: $back = 'green'; break;
                                                case 43: $back = 'yellow'; break;
                                                case 44: $back = 'blue'; break;
                                                case 45: $back = 'magenta'; break;
                                                case 46: $back = 'cyan'; break;
                                                case 47: $back = 'white'; break;
                                                // @codingStandardsIgnoreEnd

                                                default:
                                                    //user_error('Unsupported attribute: ' . $mod);
                                                    $this->ansi = '';
                                                    break 2;
                                            }
                                    }
                                }
                                break;
                            default:
                                //user_error("{$this->ansi} is unsupported\r\n");
                        }
                }
                $this->ansi = '';
                continue;
            }

            $this->tokenization[count($this->tokenization) - 1].= $source[$i];
            switch ($source[$i]) {
                case "\r":
                    $this->x = 0;
                    break;
                case "\n":
                    $this->_newLine();
                    break;
                case "\x08": // backspace
                    if ($this->x) {
                        $this->x--;
                        $this->attrs[$this->y][$this->x] = clone($this->base_attr_cell);
                        $this->screen[$this->y] = substr_replace(
                            $this->screen[$this->y],
                            $source[$i],
                            $this->x,
                            1
                        );
                    }
                    break;
                case "\x0F": // shift
                    break;
                case "\x1B": // start ANSI escape code
                    $this->tokenization[count($this->tokenization) - 1] = substr($this->tokenization[count($this->tokenization) - 1], 0, -1);
                    //if (!strlen($this->tokenization[count($this->tokenization) - 1])) {
                    //    array_pop($this->tokenization);
                    //}
                    $this->ansi.= "\x1B";
                    break;
                default:
                    $this->attrs[$this->y][$this->x] = clone($this->attr_cell);
                    if ($this->x > strlen($this->screen[$this->y])) {
                        $this->screen[$this->y] = str_repeat(' ', $this->x);
                    }
                    $this->screen[$this->y] = substr_replace(
                        $this->screen[$this->y],
                        $source[$i],
                        $this->x,
                        1
                    );

                    if ($this->x > $this->max_x) {
                        $this->x = 0;
                        $this->_newLine();
                    } else {
                        $this->x++;
                    }
            }
        }
    }

    /**
     * Add a new line
     *
     * Also update the $this->screen and $this->history buffers
     *
     * @access private
     */
    function _newLine()
    {
        //if ($this->y < $this->max_y) {
        //    $this->y++;
        //}

        while ($this->y >= $this->max_y) {
            $this->history = array_merge($this->history, array(array_shift($this->screen)));
            $this->screen[] = '';

            $this->history_attrs = array_merge($this->history_attrs, array(array_shift($this->attrs)));
            $this->attrs[] = $this->attr_row;

            if (count($this->history) >= $this->max_history) {
                array_shift($this->history);
                array_shift($this->history_attrs);
            }

            $this->y--;
        }
        $this->y++;
    }

    /**
     * Returns the current coordinate without preformating
     *
     * @access private
     * @return string
     */
    function _processCoordinate($last_attr, $cur_attr, $char)
    {
        $output = '';

        if ($last_attr != $cur_attr) {
            $close = $open = '';
            if ($last_attr->foreground != $cur_attr->foreground) {
                if ($cur_attr->foreground != 'white') {
                    $open.= '';
                }
                if ($last_attr->foreground != 'white') {
                    $close = '' . $close;
                }
            }
            if ($last_attr->background != $cur_attr->background) {
                if ($cur_attr->background != 'black') {
                    $open.= '';
                }
                if ($last_attr->background != 'black') {
                    $close = '' . $close;
                }
            }
            if ($last_attr->bold != $cur_attr->bold) {
                if ($cur_attr->bold) {
                    $open.= '';
                } else {
                    $close = '' . $close;
                }
            }
            if ($last_attr->underline != $cur_attr->underline) {
                if ($cur_attr->underline) {
                    $open.= '';
                } else {
                    $close = '' . $close;
                }
            }
            if ($last_attr->blink != $cur_attr->blink) {
                if ($cur_attr->blink) {
                    $open.= '';
                } else {
                    $close = '' . $close;
                }
            }
            $output.= $close . $open;
        }

        $output.= htmlspecialchars($char);

        return $output;
    }

    /**
     * Returns the current screen without preformating
     *
     * @access private
     * @return string
     */
    function _getScreen()
    {
        $output = '';
        $last_attr = $this->base_attr_cell;
        for ($i = 0; $i <= $this->max_y; $i++) {
            for ($j = 0; $j <= $this->max_x; $j++) {
                $cur_attr = $this->attrs[$i][$j];
                $output.= $this->_processCoordinate($last_attr, $cur_attr, isset($this->screen[$i][$j]) ? $this->screen[$i][$j] : '');
                $last_attr = $this->attrs[$i][$j];
            }
            $output.= "\r\n";
        }
        $output = substr($output, 0, -2);
        // close any remaining open tags
        $output.= $this->_processCoordinate($last_attr, $this->base_attr_cell, '');
        return rtrim($output);
    }

    /**
     * Returns the current screen
     *
     * @access public
     * @return string
     */
    function getScreen()
    {
        return '
' . $this->_getScreen() . '
';
    }

    /**
     * Returns the current screen and the x previous lines
     *
     * @access public
     * @return string
     */
    function getHistory()
    {
        $scrollback = '';
        $last_attr = $this->base_attr_cell;
        for ($i = 0; $i < count($this->history); $i++) {
            for ($j = 0; $j <= $this->max_x + 1; $j++) {
                $cur_attr = $this->history_attrs[$i][$j];
                $scrollback.= $this->_processCoordinate($last_attr, $cur_attr, isset($this->history[$i][$j]) ? $this->history[$i][$j] : '');
                $last_attr = $this->history_attrs[$i][$j];
            }
            $scrollback.= "\r\n";
        }
        $base_attr_cell = $this->base_attr_cell;
        $this->base_attr_cell = $last_attr;
        $scrollback.= $this->_getScreen();
        $this->base_attr_cell = $base_attr_cell;

        return '
' . $scrollback . '
';
    }
}
phpseclib-1.0.18/phpseclib/File/ASN1.php000066400000000000000000001676371354156543400176530ustar00rootroot00000000000000
 * @copyright 2012 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * Tag Classes
 *
 * @access private
 * @link http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=12
 */
define('FILE_ASN1_CLASS_UNIVERSAL',        0);
define('FILE_ASN1_CLASS_APPLICATION',      1);
define('FILE_ASN1_CLASS_CONTEXT_SPECIFIC', 2);
define('FILE_ASN1_CLASS_PRIVATE',          3);
/**#@-*/

/**#@+
 * Tag Classes
 *
 * @access private
 * @link http://www.obj-sys.com/asn1tutorial/node124.html
 */
define('FILE_ASN1_TYPE_BOOLEAN',           1);
define('FILE_ASN1_TYPE_INTEGER',           2);
define('FILE_ASN1_TYPE_BIT_STRING',        3);
define('FILE_ASN1_TYPE_OCTET_STRING',      4);
define('FILE_ASN1_TYPE_NULL',              5);
define('FILE_ASN1_TYPE_OBJECT_IDENTIFIER', 6);
//define('FILE_ASN1_TYPE_OBJECT_DESCRIPTOR', 7);
//define('FILE_ASN1_TYPE_INSTANCE_OF',       8); // EXTERNAL
define('FILE_ASN1_TYPE_REAL',              9);
define('FILE_ASN1_TYPE_ENUMERATED',       10);
//define('FILE_ASN1_TYPE_EMBEDDED',         11);
define('FILE_ASN1_TYPE_UTF8_STRING',      12);
//define('FILE_ASN1_TYPE_RELATIVE_OID',     13);
define('FILE_ASN1_TYPE_SEQUENCE',         16); // SEQUENCE OF
define('FILE_ASN1_TYPE_SET',              17); // SET OF
/**#@-*/
/**#@+
 * More Tag Classes
 *
 * @access private
 * @link http://www.obj-sys.com/asn1tutorial/node10.html
 */
define('FILE_ASN1_TYPE_NUMERIC_STRING',   18);
define('FILE_ASN1_TYPE_PRINTABLE_STRING', 19);
define('FILE_ASN1_TYPE_TELETEX_STRING',   20); // T61String
define('FILE_ASN1_TYPE_VIDEOTEX_STRING',  21);
define('FILE_ASN1_TYPE_IA5_STRING',       22);
define('FILE_ASN1_TYPE_UTC_TIME',         23);
define('FILE_ASN1_TYPE_GENERALIZED_TIME', 24);
define('FILE_ASN1_TYPE_GRAPHIC_STRING',   25);
define('FILE_ASN1_TYPE_VISIBLE_STRING',   26); // ISO646String
define('FILE_ASN1_TYPE_GENERAL_STRING',   27);
define('FILE_ASN1_TYPE_UNIVERSAL_STRING', 28);
//define('FILE_ASN1_TYPE_CHARACTER_STRING', 29);
define('FILE_ASN1_TYPE_BMP_STRING',       30);
/**#@-*/

/**#@+
 * Tag Aliases
 *
 * These tags are kinda place holders for other tags.
 *
 * @access private
 */
define('FILE_ASN1_TYPE_CHOICE',          -1);
define('FILE_ASN1_TYPE_ANY',             -2);
/**#@-*/

/**
 * ASN.1 Element
 *
 * Bypass normal encoding rules in File_ASN1::encodeDER()
 *
 * @package File_ASN1
 * @author  Jim Wigginton 
 * @access  public
 */
class File_ASN1_Element
{
    /**
     * Raw element value
     *
     * @var string
     * @access private
     */
    var $element;

    /**
     * Constructor
     *
     * @param string $encoded
     * @return File_ASN1_Element
     * @access public
     */
    function __construct($encoded)
    {
        $this->element = $encoded;
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param int $mode
     * @access public
     */
    function File_ASN1_Element($encoded)
    {
        $this->__construct($encoded);
    }
}

/**
 * Pure-PHP ASN.1 Parser
 *
 * @package File_ASN1
 * @author  Jim Wigginton 
 * @access  public
 */
class File_ASN1
{
    /**
     * ASN.1 object identifier
     *
     * @var array
     * @access private
     * @link http://en.wikipedia.org/wiki/Object_identifier
     */
    var $oids = array();

    /**
     * Default date format
     *
     * @var string
     * @access private
     * @link http://php.net/class.datetime
     */
    var $format = 'D, d M Y H:i:s O';

    /**
     * Default date format
     *
     * @var array
     * @access private
     * @see self::setTimeFormat()
     * @see self::asn1map()
     * @link http://php.net/class.datetime
     */
    var $encoded;

    /**
     * Filters
     *
     * If the mapping type is FILE_ASN1_TYPE_ANY what do we actually encode it as?
     *
     * @var array
     * @access private
     * @see self::_encode_der()
     */
    var $filters;

    /**
     * Type mapping table for the ANY type.
     *
     * Structured or unknown types are mapped to a FILE_ASN1_Element.
     * Unambiguous types get the direct mapping (int/real/bool).
     * Others are mapped as a choice, with an extra indexing level.
     *
     * @var array
     * @access public
     */
    var $ANYmap = array(
        FILE_ASN1_TYPE_BOOLEAN              => true,
        FILE_ASN1_TYPE_INTEGER              => true,
        FILE_ASN1_TYPE_BIT_STRING           => 'bitString',
        FILE_ASN1_TYPE_OCTET_STRING         => 'octetString',
        FILE_ASN1_TYPE_NULL                 => 'null',
        FILE_ASN1_TYPE_OBJECT_IDENTIFIER    => 'objectIdentifier',
        FILE_ASN1_TYPE_REAL                 => true,
        FILE_ASN1_TYPE_ENUMERATED           => 'enumerated',
        FILE_ASN1_TYPE_UTF8_STRING          => 'utf8String',
        FILE_ASN1_TYPE_NUMERIC_STRING       => 'numericString',
        FILE_ASN1_TYPE_PRINTABLE_STRING     => 'printableString',
        FILE_ASN1_TYPE_TELETEX_STRING       => 'teletexString',
        FILE_ASN1_TYPE_VIDEOTEX_STRING      => 'videotexString',
        FILE_ASN1_TYPE_IA5_STRING           => 'ia5String',
        FILE_ASN1_TYPE_UTC_TIME             => 'utcTime',
        FILE_ASN1_TYPE_GENERALIZED_TIME     => 'generalTime',
        FILE_ASN1_TYPE_GRAPHIC_STRING       => 'graphicString',
        FILE_ASN1_TYPE_VISIBLE_STRING       => 'visibleString',
        FILE_ASN1_TYPE_GENERAL_STRING       => 'generalString',
        FILE_ASN1_TYPE_UNIVERSAL_STRING     => 'universalString',
        //FILE_ASN1_TYPE_CHARACTER_STRING     => 'characterString',
        FILE_ASN1_TYPE_BMP_STRING           => 'bmpString'
    );

    /**
     * String type to character size mapping table.
     *
     * Non-convertable types are absent from this table.
     * size == 0 indicates variable length encoding.
     *
     * @var array
     * @access public
     */
    var $stringTypeSize = array(
        FILE_ASN1_TYPE_UTF8_STRING      => 0,
        FILE_ASN1_TYPE_BMP_STRING       => 2,
        FILE_ASN1_TYPE_UNIVERSAL_STRING => 4,
        FILE_ASN1_TYPE_PRINTABLE_STRING => 1,
        FILE_ASN1_TYPE_TELETEX_STRING   => 1,
        FILE_ASN1_TYPE_IA5_STRING       => 1,
        FILE_ASN1_TYPE_VISIBLE_STRING   => 1,
    );

    /**
     * Default Constructor.
     *
     * @access public
     */
    function __construct()
    {
        static $static_init = null;
        if (!$static_init) {
            $static_init = true;
            if (!class_exists('Math_BigInteger')) {
                include_once 'Math/BigInteger.php';
            }
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function File_ASN1()
    {
        $this->__construct($mode);
    }

    /**
     * Parse BER-encoding
     *
     * Serves a similar purpose to openssl's asn1parse
     *
     * @param string $encoded
     * @return array
     * @access public
     */
    function decodeBER($encoded)
    {
        if (is_object($encoded) && strtolower(get_class($encoded)) == 'file_asn1_element') {
            $encoded = $encoded->element;
        }

        $this->encoded = $encoded;
        // encapsulate in an array for BC with the old decodeBER
        return array($this->_decode_ber($encoded));
    }

    /**
     * Parse BER-encoding (Helper function)
     *
     * Sometimes we want to get the BER encoding of a particular tag.  $start lets us do that without having to reencode.
     * $encoded is passed by reference for the recursive calls done for FILE_ASN1_TYPE_BIT_STRING and
     * FILE_ASN1_TYPE_OCTET_STRING. In those cases, the indefinite length is used.
     *
     * @param string $encoded
     * @param int $start
     * @param int $encoded_pos
     * @return array
     * @access private
     */
    function _decode_ber($encoded, $start = 0, $encoded_pos = 0)
    {
        $current = array('start' => $start);

        $type = ord($encoded[$encoded_pos++]);
        $start++;

        $constructed = ($type >> 5) & 1;

        $tag = $type & 0x1F;
        if ($tag == 0x1F) {
            $tag = 0;
            // process septets (since the eighth bit is ignored, it's not an octet)
            do {
                $temp = ord($encoded[$encoded_pos++]);
                $loop = $temp >> 7;
                $tag <<= 7;
                $tag |= $temp & 0x7F;
                $start++;
            } while ($loop);
        }

        // Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
        $length = ord($encoded[$encoded_pos++]);
        $start++;
        if ($length == 0x80) { // indefinite length
            // "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
            //  immediately available." -- paragraph 8.1.3.2.c
            $length = strlen($encoded) - $encoded_pos;
        } elseif ($length & 0x80) { // definite length, long form
            // technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
            // support it up to four.
            $length&= 0x7F;
            $temp = substr($encoded, $encoded_pos, $length);
            $encoded_pos += $length;
            // tags of indefinte length don't really have a header length; this length includes the tag
            $current+= array('headerlength' => $length + 2);
            $start+= $length;
            extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
        } else {
            $current+= array('headerlength' => 2);
        }

        if ($length > (strlen($encoded) - $encoded_pos)) {
            return false;
        }

        $content = substr($encoded, $encoded_pos, $length);
        $content_pos = 0;

        // at this point $length can be overwritten. it's only accurate for definite length things as is

        /* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
           built-in types. It defines an application-independent data type that must be distinguishable from all other
           data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
           have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
           a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
           alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
           data type; the term CONTEXT-SPECIFIC does not appear.

             -- http://www.obj-sys.com/asn1tutorial/node12.html */
        $class = ($type >> 6) & 3;
        switch ($class) {
            case FILE_ASN1_CLASS_APPLICATION:
            case FILE_ASN1_CLASS_PRIVATE:
            case FILE_ASN1_CLASS_CONTEXT_SPECIFIC:
                if (!$constructed) {
                    return array(
                        'type'     => $class,
                        'constant' => $tag,
                        'content'  => $content,
                        'length'   => $length + $start - $current['start']
                    );
                }

                $newcontent = array();
                $remainingLength = $length;
                while ($remainingLength > 0) {
                    $temp = $this->_decode_ber($content, $start, $content_pos);
                    if ($temp === false) {
                        break;
                    }
                    $length = $temp['length'];
                    // end-of-content octets - see paragraph 8.1.5
                    if (substr($content, $content_pos + $length, 2) == "\0\0") {
                        $length+= 2;
                        $start+= $length;
                        $newcontent[] = $temp;
                        break;
                    }
                    $start+= $length;
                    $remainingLength-= $length;
                    $newcontent[] = $temp;
                    $content_pos += $length;
                }

                return array(
                    'type'     => $class,
                    'constant' => $tag,
                    // the array encapsulation is for BC with the old format
                    'content'  => $newcontent,
                    // the only time when $content['headerlength'] isn't defined is when the length is indefinite.
                    // the absence of $content['headerlength'] is how we know if something is indefinite or not.
                    // technically, it could be defined to be 2 and then another indicator could be used but whatever.
                    'length'   => $start - $current['start']
                ) + $current;
        }

        $current+= array('type' => $tag);

        // decode UNIVERSAL tags
        switch ($tag) {
            case FILE_ASN1_TYPE_BOOLEAN:
                // "The contents octets shall consist of a single octet." -- paragraph 8.2.1
                //if (strlen($content) != 1) {
                //    return false;
                //}
                $current['content'] = (bool) ord($content[$content_pos]);
                break;
            case FILE_ASN1_TYPE_INTEGER:
            case FILE_ASN1_TYPE_ENUMERATED:
                $current['content'] = new Math_BigInteger(substr($content, $content_pos), -256);
                break;
            case FILE_ASN1_TYPE_REAL: // not currently supported
                return false;
            case FILE_ASN1_TYPE_BIT_STRING:
                // The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
                // the number of unused bits in the final subsequent octet. The number shall be in the range zero to
                // seven.
                if (!$constructed) {
                    $current['content'] = substr($content, $content_pos);
                } else {
                    $temp = $this->_decode_ber($content, $start, $content_pos);
                    if ($temp === false) {
                        return false;
                    }
                    $length-= (strlen($content) - $content_pos);
                    $last = count($temp) - 1;
                    for ($i = 0; $i < $last; $i++) {
                        // all subtags should be bit strings
                        //if ($temp[$i]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
                        //    return false;
                        //}
                        $current['content'].= substr($temp[$i]['content'], 1);
                    }
                    // all subtags should be bit strings
                    //if ($temp[$last]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
                    //    return false;
                    //}
                    $current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
                }
                break;
            case FILE_ASN1_TYPE_OCTET_STRING:
                if (!$constructed) {
                    $current['content'] = substr($content, $content_pos);
                } else {
                    $current['content'] = '';
                    $length = 0;
                    while (substr($content, $content_pos, 2) != "\0\0") {
                        $temp = $this->_decode_ber($content, $length + $start, $content_pos);
                        if ($temp === false) {
                            return false;
                        }
                        $content_pos += $temp['length'];
                        // all subtags should be octet strings
                        //if ($temp['type'] != FILE_ASN1_TYPE_OCTET_STRING) {
                        //    return false;
                        //}
                        $current['content'].= $temp['content'];
                        $length+= $temp['length'];
                    }
                    if (substr($content, $content_pos, 2) == "\0\0") {
                        $length+= 2; // +2 for the EOC
                    }
                }
                break;
            case FILE_ASN1_TYPE_NULL:
                // "The contents octets shall not contain any octets." -- paragraph 8.8.2
                //if (strlen($content)) {
                //    return false;
                //}
                break;
            case FILE_ASN1_TYPE_SEQUENCE:
            case FILE_ASN1_TYPE_SET:
                $offset = 0;
                $current['content'] = array();
                $content_len = strlen($content);
                while ($content_pos < $content_len) {
                    // if indefinite length construction was used and we have an end-of-content string next
                    // see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
                    if (!isset($current['headerlength']) && substr($content, $content_pos, 2) == "\0\0") {
                        $length = $offset + 2; // +2 for the EOC
                        break 2;
                    }
                    $temp = $this->_decode_ber($content, $start + $offset, $content_pos);
                    if ($temp === false) {
                        return false;
                    }
                    $content_pos += $temp['length'];
                    $current['content'][] = $temp;
                    $offset+= $temp['length'];
                }
                break;
            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
                $current['content'] = $this->_decodeOID(substr($content, $content_pos));
                break;
            /* Each character string type shall be encoded as if it had been declared:
               [UNIVERSAL x] IMPLICIT OCTET STRING

                 -- X.690-0207.pdf#page=23 (paragraph 8.21.3)

               Per that, we're not going to do any validation.  If there are any illegal characters in the string,
               we don't really care */
            case FILE_ASN1_TYPE_NUMERIC_STRING:
                // 0,1,2,3,4,5,6,7,8,9, and space
            case FILE_ASN1_TYPE_PRINTABLE_STRING:
                // Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
                // hyphen, full stop, solidus, colon, equal sign, question mark
            case FILE_ASN1_TYPE_TELETEX_STRING:
                // The Teletex character set in CCITT's T61, space, and delete
                // see http://en.wikipedia.org/wiki/Teletex#Character_sets
            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
                // The Videotex character set in CCITT's T.100 and T.101, space, and delete
            case FILE_ASN1_TYPE_VISIBLE_STRING:
                // Printing character sets of international ASCII, and space
            case FILE_ASN1_TYPE_IA5_STRING:
                // International Alphabet 5 (International ASCII)
            case FILE_ASN1_TYPE_GRAPHIC_STRING:
                // All registered G sets, and space
            case FILE_ASN1_TYPE_GENERAL_STRING:
                // All registered C and G sets, space and delete
            case FILE_ASN1_TYPE_UTF8_STRING:
                // ????
            case FILE_ASN1_TYPE_BMP_STRING:
                $current['content'] = substr($content, $content_pos);
                break;
            case FILE_ASN1_TYPE_UTC_TIME:
            case FILE_ASN1_TYPE_GENERALIZED_TIME:
                $current['content'] = class_exists('DateTime') ?
                    $this->_decodeDateTime(substr($content, $content_pos), $tag) :
                    $this->_decodeUnixTime(substr($content, $content_pos), $tag);
            default:
        }

        $start+= $length;

        // ie. length is the length of the full TLV encoding - it's not just the length of the value
        return $current + array('length' => $start - $current['start']);
    }

    /**
     * ASN.1 Map
     *
     * Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
     *
     * "Special" mappings may be applied on a per tag-name basis via $special.
     *
     * @param array $decoded
     * @param array $mapping
     * @param array $special
     * @return array
     * @access public
     */
    function asn1map($decoded, $mapping, $special = array())
    {
        if (isset($mapping['explicit']) && is_array($decoded['content'])) {
            $decoded = $decoded['content'][0];
        }

        switch (true) {
            case $mapping['type'] == FILE_ASN1_TYPE_ANY:
                $intype = $decoded['type'];
                if (isset($decoded['constant']) || !isset($this->ANYmap[$intype]) || (ord($this->encoded[$decoded['start']]) & 0x20)) {
                    return new File_ASN1_Element(substr($this->encoded, $decoded['start'], $decoded['length']));
                }
                $inmap = $this->ANYmap[$intype];
                if (is_string($inmap)) {
                    return array($inmap => $this->asn1map($decoded, array('type' => $intype) + $mapping, $special));
                }
                break;
            case $mapping['type'] == FILE_ASN1_TYPE_CHOICE:
                foreach ($mapping['children'] as $key => $option) {
                    switch (true) {
                        case isset($option['constant']) && $option['constant'] == $decoded['constant']:
                        case !isset($option['constant']) && $option['type'] == $decoded['type']:
                            $value = $this->asn1map($decoded, $option, $special);
                            break;
                        case !isset($option['constant']) && $option['type'] == FILE_ASN1_TYPE_CHOICE:
                            $v = $this->asn1map($decoded, $option, $special);
                            if (isset($v)) {
                                $value = $v;
                            }
                    }
                    if (isset($value)) {
                        if (isset($special[$key])) {
                            $value = call_user_func($special[$key], $value);
                        }
                        return array($key => $value);
                    }
                }
                return null;
            case isset($mapping['implicit']):
            case isset($mapping['explicit']):
            case $decoded['type'] == $mapping['type']:
                break;
            default:
                // if $decoded['type'] and $mapping['type'] are both strings, but different types of strings,
                // let it through
                switch (true) {
                    case $decoded['type'] < 18: // FILE_ASN1_TYPE_NUMERIC_STRING == 18
                    case $decoded['type'] > 30: // FILE_ASN1_TYPE_BMP_STRING == 30
                    case $mapping['type'] < 18:
                    case $mapping['type'] > 30:
                        return null;
                }
        }

        if (isset($mapping['implicit'])) {
            $decoded['type'] = $mapping['type'];
        }

        switch ($decoded['type']) {
            case FILE_ASN1_TYPE_SEQUENCE:
                $map = array();

                // ignore the min and max
                if (isset($mapping['min']) && isset($mapping['max'])) {
                    $child = $mapping['children'];
                    foreach ($decoded['content'] as $content) {
                        if (($map[] = $this->asn1map($content, $child, $special)) === null) {
                            return null;
                        }
                    }

                    return $map;
                }

                $n = count($decoded['content']);
                $i = 0;

                foreach ($mapping['children'] as $key => $child) {
                    $maymatch = $i < $n; // Match only existing input.
                    if ($maymatch) {
                        $temp = $decoded['content'][$i];

                        if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
                            // Get the mapping and input class & constant.
                            $childClass = $tempClass = FILE_ASN1_CLASS_UNIVERSAL;
                            $constant = null;
                            if (isset($temp['constant'])) {
                                $tempClass = $temp['type'];
                            }
                            if (isset($child['class'])) {
                                $childClass = $child['class'];
                                $constant = $child['cast'];
                            } elseif (isset($child['constant'])) {
                                $childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
                                $constant = $child['constant'];
                            }

                            if (isset($constant) && isset($temp['constant'])) {
                                // Can only match if constants and class match.
                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
                            } else {
                                // Can only match if no constant expected and type matches or is generic.
                                $maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
                            }
                        }
                    }

                    if ($maymatch) {
                        // Attempt submapping.
                        $candidate = $this->asn1map($temp, $child, $special);
                        $maymatch = $candidate !== null;
                    }

                    if ($maymatch) {
                        // Got the match: use it.
                        if (isset($special[$key])) {
                            $candidate = call_user_func($special[$key], $candidate);
                        }
                        $map[$key] = $candidate;
                        $i++;
                    } elseif (isset($child['default'])) {
                        $map[$key] = $child['default']; // Use default.
                    } elseif (!isset($child['optional'])) {
                        return null; // Syntax error.
                    }
                }

                // Fail mapping if all input items have not been consumed.
                return $i < $n ? null: $map;

            // the main diff between sets and sequences is the encapsulation of the foreach in another for loop
            case FILE_ASN1_TYPE_SET:
                $map = array();

                // ignore the min and max
                if (isset($mapping['min']) && isset($mapping['max'])) {
                    $child = $mapping['children'];
                    foreach ($decoded['content'] as $content) {
                        if (($map[] = $this->asn1map($content, $child, $special)) === null) {
                            return null;
                        }
                    }

                    return $map;
                }

                for ($i = 0; $i < count($decoded['content']); $i++) {
                    $temp = $decoded['content'][$i];
                    $tempClass = FILE_ASN1_CLASS_UNIVERSAL;
                    if (isset($temp['constant'])) {
                        $tempClass = $temp['type'];
                    }

                    foreach ($mapping['children'] as $key => $child) {
                        if (isset($map[$key])) {
                            continue;
                        }
                        $maymatch = true;
                        if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
                            $childClass = FILE_ASN1_CLASS_UNIVERSAL;
                            $constant = null;
                            if (isset($child['class'])) {
                                $childClass = $child['class'];
                                $constant = $child['cast'];
                            } elseif (isset($child['constant'])) {
                                $childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
                                $constant = $child['constant'];
                            }

                            if (isset($constant) && isset($temp['constant'])) {
                                // Can only match if constants and class match.
                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
                            } else {
                                // Can only match if no constant expected and type matches or is generic.
                                $maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
                            }
                        }

                        if ($maymatch) {
                            // Attempt submapping.
                            $candidate = $this->asn1map($temp, $child, $special);
                            $maymatch = $candidate !== null;
                        }

                        if (!$maymatch) {
                            break;
                        }

                        // Got the match: use it.
                        if (isset($special[$key])) {
                            $candidate = call_user_func($special[$key], $candidate);
                        }
                        $map[$key] = $candidate;
                        break;
                    }
                }

                foreach ($mapping['children'] as $key => $child) {
                    if (!isset($map[$key])) {
                        if (isset($child['default'])) {
                            $map[$key] = $child['default'];
                        } elseif (!isset($child['optional'])) {
                            return null;
                        }
                    }
                }
                return $map;
            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
                return isset($this->oids[$decoded['content']]) ? $this->oids[$decoded['content']] : $decoded['content'];
            case FILE_ASN1_TYPE_UTC_TIME:
            case FILE_ASN1_TYPE_GENERALIZED_TIME:
                if (class_exists('DateTime')) {
                    // for explicitly tagged optional stuff
                    if (is_array($decoded['content'])) {
                        $decoded['content'] = $decoded['content'][0]['content'];
                    }
                    // for implicitly tagged optional stuff
                    // in theory, doing isset($mapping['implicit']) would work but malformed certs do exist
                    // in the wild that OpenSSL decodes without issue so we'll support them as well
                    if (!is_object($decoded['content'])) {
                        $decoded['content'] = $this->_decodeDateTime($decoded['content'], $decoded['type']);
                    }
                    if (!$decoded['content']) {
                        return false;
                    }
                    return $decoded['content']->format($this->format);
                } else {
                    if (is_array($decoded['content'])) {
                        $decoded['content'] = $decoded['content'][0]['content'];
                    }
                    if (!is_int($decoded['content'])) {
                        $decoded['content'] = $this->_decodeUnixTime($decoded['content'], $decoded['type']);
                    }
                    return @date($this->format, $decoded['content']);
                }
            case FILE_ASN1_TYPE_BIT_STRING:
                if (isset($mapping['mapping'])) {
                    $offset = ord($decoded['content'][0]);
                    $size = (strlen($decoded['content']) - 1) * 8 - $offset;
                    /*
                       From X.680-0207.pdf#page=46 (21.7):

                       "When a "NamedBitList" is used in defining a bitstring type ASN.1 encoding rules are free to add (or remove)
                        arbitrarily any trailing 0 bits to (or from) values that are being encoded or decoded. Application designers should
                        therefore ensure that different semantics are not associated with such values which differ only in the number of trailing
                        0 bits."
                    */
                    $bits = count($mapping['mapping']) == $size ? array() : array_fill(0, count($mapping['mapping']) - $size, false);
                    for ($i = strlen($decoded['content']) - 1; $i > 0; $i--) {
                        $current = ord($decoded['content'][$i]);
                        for ($j = $offset; $j < 8; $j++) {
                            $bits[] = (bool) ($current & (1 << $j));
                        }
                        $offset = 0;
                    }
                    $values = array();
                    $map = array_reverse($mapping['mapping']);
                    foreach ($map as $i => $value) {
                        if ($bits[$i]) {
                            $values[] = $value;
                        }
                    }
                    return $values;
                }
            case FILE_ASN1_TYPE_OCTET_STRING:
                return base64_encode($decoded['content']);
            case FILE_ASN1_TYPE_NULL:
                return '';
            case FILE_ASN1_TYPE_BOOLEAN:
                return $decoded['content'];
            case FILE_ASN1_TYPE_NUMERIC_STRING:
            case FILE_ASN1_TYPE_PRINTABLE_STRING:
            case FILE_ASN1_TYPE_TELETEX_STRING:
            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
            case FILE_ASN1_TYPE_IA5_STRING:
            case FILE_ASN1_TYPE_GRAPHIC_STRING:
            case FILE_ASN1_TYPE_VISIBLE_STRING:
            case FILE_ASN1_TYPE_GENERAL_STRING:
            case FILE_ASN1_TYPE_UNIVERSAL_STRING:
            case FILE_ASN1_TYPE_UTF8_STRING:
            case FILE_ASN1_TYPE_BMP_STRING:
                return $decoded['content'];
            case FILE_ASN1_TYPE_INTEGER:
            case FILE_ASN1_TYPE_ENUMERATED:
                $temp = $decoded['content'];
                if (isset($mapping['implicit'])) {
                    $temp = new Math_BigInteger($decoded['content'], -256);
                }
                if (isset($mapping['mapping'])) {
                    $temp = (int) $temp->toString();
                    return isset($mapping['mapping'][$temp]) ?
                        $mapping['mapping'][$temp] :
                        false;
                }
                return $temp;
        }
    }

    /**
     * ASN.1 Encode
     *
     * DER-encodes an ASN.1 semantic mapping ($mapping).  Some libraries would probably call this function
     * an ASN.1 compiler.
     *
     * "Special" mappings can be applied via $special.
     *
     * @param string $source
     * @param string $mapping
     * @param int $idx
     * @return string
     * @access public
     */
    function encodeDER($source, $mapping, $special = array())
    {
        $this->location = array();
        return $this->_encode_der($source, $mapping, null, $special);
    }

    /**
     * ASN.1 Encode (Helper function)
     *
     * @param string $source
     * @param string $mapping
     * @param int $idx
     * @return string
     * @access private
     */
    function _encode_der($source, $mapping, $idx = null, $special = array())
    {
        if (is_object($source) && strtolower(get_class($source)) == 'file_asn1_element') {
            return $source->element;
        }

        // do not encode (implicitly optional) fields with value set to default
        if (isset($mapping['default']) && $source === $mapping['default']) {
            return '';
        }

        if (isset($idx)) {
            if (isset($special[$idx])) {
                $source = call_user_func($special[$idx], $source);
            }
            $this->location[] = $idx;
        }

        $tag = $mapping['type'];

        switch ($tag) {
            case FILE_ASN1_TYPE_SET:    // Children order is not important, thus process in sequence.
            case FILE_ASN1_TYPE_SEQUENCE:
                $tag|= 0x20; // set the constructed bit

                // ignore the min and max
                if (isset($mapping['min']) && isset($mapping['max'])) {
                    $value = array();
                    $child = $mapping['children'];

                    foreach ($source as $content) {
                        $temp = $this->_encode_der($content, $child, null, $special);
                        if ($temp === false) {
                            return false;
                        }
                        $value[]= $temp;
                    }
                    /* "The encodings of the component values of a set-of value shall appear in ascending order, the encodings being compared
                        as octet strings with the shorter components being padded at their trailing end with 0-octets.
                        NOTE - The padding octets are for comparison purposes only and do not appear in the encodings."

                       -- sec 11.6 of http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf  */
                    if ($mapping['type'] == FILE_ASN1_TYPE_SET) {
                        sort($value);
                    }
                    $value = implode('', $value);
                    break;
                }

                $value = '';
                foreach ($mapping['children'] as $key => $child) {
                    if (!array_key_exists($key, $source)) {
                        if (!isset($child['optional'])) {
                            return false;
                        }
                        continue;
                    }

                    $temp = $this->_encode_der($source[$key], $child, $key, $special);
                    if ($temp === false) {
                        return false;
                    }

                    // An empty child encoding means it has been optimized out.
                    // Else we should have at least one tag byte.
                    if ($temp === '') {
                        continue;
                    }

                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
                    if (isset($child['constant'])) {
                        /*
                           From X.680-0207.pdf#page=58 (30.6):

                           "The tagging construction specifies explicit tagging if any of the following holds:
                            ...
                            c) the "Tag Type" alternative is used and the value of "TagDefault" for the module is IMPLICIT TAGS or
                            AUTOMATIC TAGS, but the type defined by "Type" is an untagged choice type, an untagged open type, or
                            an untagged "DummyReference" (see ITU-T Rec. X.683 | ISO/IEC 8824-4, 8.3)."
                         */
                        if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
                            $temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
                        } else {
                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
                            $temp = $subtag . substr($temp, 1);
                        }
                    }
                    $value.= $temp;
                }
                break;
            case FILE_ASN1_TYPE_CHOICE:
                $temp = false;

                foreach ($mapping['children'] as $key => $child) {
                    if (!isset($source[$key])) {
                        continue;
                    }

                    $temp = $this->_encode_der($source[$key], $child, $key, $special);
                    if ($temp === false) {
                        return false;
                    }

                    // An empty child encoding means it has been optimized out.
                    // Else we should have at least one tag byte.
                    if ($temp === '') {
                        continue;
                    }

                    $tag = ord($temp[0]);

                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
                    if (isset($child['constant'])) {
                        if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
                            $temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
                        } else {
                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
                            $temp = $subtag . substr($temp, 1);
                        }
                    }
                }

                if (isset($idx)) {
                    array_pop($this->location);
                }

                if ($temp && isset($mapping['cast'])) {
                    $temp[0] = chr(($mapping['class'] << 6) | ($tag & 0x20) | $mapping['cast']);
                }

                return $temp;
            case FILE_ASN1_TYPE_INTEGER:
            case FILE_ASN1_TYPE_ENUMERATED:
                if (!isset($mapping['mapping'])) {
                    if (is_numeric($source)) {
                        $source = new Math_BigInteger($source);
                    }
                    $value = $source->toBytes(true);
                } else {
                    $value = array_search($source, $mapping['mapping']);
                    if ($value === false) {
                        return false;
                    }
                    $value = new Math_BigInteger($value);
                    $value = $value->toBytes(true);
                }
                if (!strlen($value)) {
                    $value = chr(0);
                }
                break;
            case FILE_ASN1_TYPE_UTC_TIME:
            case FILE_ASN1_TYPE_GENERALIZED_TIME:
                $format = $mapping['type'] == FILE_ASN1_TYPE_UTC_TIME ? 'y' : 'Y';
                $format.= 'mdHis';
                if (!class_exists('DateTime')) {
                    $value = @gmdate($format, strtotime($source)) . 'Z';
                } else {
                    $date = new DateTime($source, new DateTimeZone('GMT'));
                    $value = $date->format($format) . 'Z';
                }
                break;
            case FILE_ASN1_TYPE_BIT_STRING:
                if (isset($mapping['mapping'])) {
                    $bits = array_fill(0, count($mapping['mapping']), 0);
                    $size = 0;
                    for ($i = 0; $i < count($mapping['mapping']); $i++) {
                        if (in_array($mapping['mapping'][$i], $source)) {
                            $bits[$i] = 1;
                            $size = $i;
                        }
                    }

                    if (isset($mapping['min']) && $mapping['min'] >= 1 && $size < $mapping['min']) {
                        $size = $mapping['min'] - 1;
                    }

                    $offset = 8 - (($size + 1) & 7);
                    $offset = $offset !== 8 ? $offset : 0;

                    $value = chr($offset);

                    for ($i = $size + 1; $i < count($mapping['mapping']); $i++) {
                        unset($bits[$i]);
                    }

                    $bits = implode('', array_pad($bits, $size + $offset + 1, 0));
                    $bytes = explode(' ', rtrim(chunk_split($bits, 8, ' ')));
                    foreach ($bytes as $byte) {
                        $value.= chr(bindec($byte));
                    }

                    break;
                }
            case FILE_ASN1_TYPE_OCTET_STRING:
                /* The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
                   the number of unused bits in the final subsequent octet. The number shall be in the range zero to seven.

                   -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=16 */
                $value = base64_decode($source);
                break;
            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
                $value = $this->_encodeOID($source);
                break;
            case FILE_ASN1_TYPE_ANY:
                $loc = $this->location;
                if (isset($idx)) {
                    array_pop($this->location);
                }

                switch (true) {
                    case !isset($source):
                        return $this->_encode_der(null, array('type' => FILE_ASN1_TYPE_NULL) + $mapping, null, $special);
                    case is_int($source):
                    case is_object($source) && strtolower(get_class($source)) == 'math_biginteger':
                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_INTEGER) + $mapping, null, $special);
                    case is_float($source):
                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_REAL) + $mapping, null, $special);
                    case is_bool($source):
                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_BOOLEAN) + $mapping, null, $special);
                    case is_array($source) && count($source) == 1:
                        $typename = implode('', array_keys($source));
                        $outtype = array_search($typename, $this->ANYmap, true);
                        if ($outtype !== false) {
                            return $this->_encode_der($source[$typename], array('type' => $outtype) + $mapping, null, $special);
                        }
                }

                $filters = $this->filters;
                foreach ($loc as $part) {
                    if (!isset($filters[$part])) {
                        $filters = false;
                        break;
                    }
                    $filters = $filters[$part];
                }
                if ($filters === false) {
                    user_error('No filters defined for ' . implode('/', $loc));
                    return false;
                }
                return $this->_encode_der($source, $filters + $mapping, null, $special);
            case FILE_ASN1_TYPE_NULL:
                $value = '';
                break;
            case FILE_ASN1_TYPE_NUMERIC_STRING:
            case FILE_ASN1_TYPE_TELETEX_STRING:
            case FILE_ASN1_TYPE_PRINTABLE_STRING:
            case FILE_ASN1_TYPE_UNIVERSAL_STRING:
            case FILE_ASN1_TYPE_UTF8_STRING:
            case FILE_ASN1_TYPE_BMP_STRING:
            case FILE_ASN1_TYPE_IA5_STRING:
            case FILE_ASN1_TYPE_VISIBLE_STRING:
            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
            case FILE_ASN1_TYPE_GRAPHIC_STRING:
            case FILE_ASN1_TYPE_GENERAL_STRING:
                $value = $source;
                break;
            case FILE_ASN1_TYPE_BOOLEAN:
                $value = $source ? "\xFF" : "\x00";
                break;
            default:
                user_error('Mapping provides no type definition for ' . implode('/', $this->location));
                return false;
        }

        if (isset($idx)) {
            array_pop($this->location);
        }

        if (isset($mapping['cast'])) {
            if (isset($mapping['explicit']) || $mapping['type'] == FILE_ASN1_TYPE_CHOICE) {
                $value = chr($tag) . $this->_encodeLength(strlen($value)) . $value;
                $tag = ($mapping['class'] << 6) | 0x20 | $mapping['cast'];
            } else {
                $tag = ($mapping['class'] << 6) | (ord($temp[0]) & 0x20) | $mapping['cast'];
            }
        }

        return chr($tag) . $this->_encodeLength(strlen($value)) . $value;
    }

    /**
     * DER-encode the length
     *
     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
     *
     * @access private
     * @param int $length
     * @return string
     */
    function _encodeLength($length)
    {
        if ($length <= 0x7F) {
            return chr($length);
        }

        $temp = ltrim(pack('N', $length), chr(0));
        return pack('Ca*', 0x80 | strlen($temp), $temp);
    }

    /**
     * BER-decode the OID
     *
     * Called by _decode_ber()
     *
     * @access private
     * @param string $content
     * @return string
     */
    function _decodeOID($content)
    {
        static $eighty;
        if (!$eighty) {
            $eighty = new Math_BigInteger(80);
        }

        $oid = array();
        $pos = 0;
        $len = strlen($content);
        $n = new Math_BigInteger();
        while ($pos < $len) {
            $temp = ord($content[$pos++]);
            $n = $n->bitwise_leftShift(7);
            $n = $n->bitwise_or(new Math_BigInteger($temp & 0x7F));
            if (~$temp & 0x80) {
                $oid[] = $n;
                $n = new Math_BigInteger();
            }
        }
        $part1 = array_shift($oid);
        $first = floor(ord($content[0]) / 40);
        /*
          "This packing of the first two object identifier components recognizes that only three values are allocated from the root
           node, and at most 39 subsequent values from nodes reached by X = 0 and X = 1."

          -- https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=22
        */
        if ($first <= 2) { // ie. 0 <= ord($content[0]) < 120 (0x78)
            array_unshift($oid, ord($content[0]) % 40);
            array_unshift($oid, $first);
        } else {
            array_unshift($oid, $part1->subtract($eighty));
            array_unshift($oid, 2);
        }

        return implode('.', $oid);
    }

    /**
     * DER-encode the OID
     *
     * Called by _encode_der()
     *
     * @access private
     * @param string $content
     * @return string
     */
    function _encodeOID($source)
    {
        static $mask, $zero, $forty;
        if (!$mask) {
            $mask = new Math_BigInteger(0x7F);
            $zero = new Math_BigInteger();
            $forty = new Math_BigInteger(40);
        }

        $oid = preg_match('#(?:\d+\.)+#', $source) ? $source : array_search($source, $this->oids);
        if ($oid === false) {
            user_error('Invalid OID');
            return false;
        }
        $parts = explode('.', $oid);
        $part1 = array_shift($parts);
        $part2 = array_shift($parts);

        $first = new Math_BigInteger($part1);
        $first = $first->multiply($forty);
        $first = $first->add(new Math_BigInteger($part2));

        array_unshift($parts, $first->toString());

        $value = '';
        foreach ($parts as $part) {
            if (!$part) {
                $temp = "\0";
            } else {
                $temp = '';
                $part = new Math_BigInteger($part);
                while (!$part->equals($zero)) {
                    $submask = $part->bitwise_and($mask);
                    $submask->setPrecision(8);
                    $temp = (chr(0x80) | $submask->toBytes()) . $temp;
                    $part = $part->bitwise_rightShift(7);
                }
                $temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F);
            }
            $value.= $temp;
        }

        return $value;
    }

    /**
     * BER-decode the time (using UNIX time)
     *
     * Called by _decode_ber() and in the case of implicit tags asn1map().
     *
     * @access private
     * @param string $content
     * @param int $tag
     * @return string
     */
    function _decodeUnixTime($content, $tag)
    {
        /* UTCTime:
           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
           http://www.obj-sys.com/asn1tutorial/node15.html

           GeneralizedTime:
           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
           http://www.obj-sys.com/asn1tutorial/node14.html */

        $pattern = $tag == FILE_ASN1_TYPE_UTC_TIME ?
            '#^(..)(..)(..)(..)(..)(..)?(.*)$#' :
            '#(....)(..)(..)(..)(..)(..).*([Z+-].*)$#';

        preg_match($pattern, $content, $matches);

        list(, $year, $month, $day, $hour, $minute, $second, $timezone) = $matches;

        if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
            $year = $year >= 50 ? "19$year" : "20$year";
        }

        if ($timezone == 'Z') {
            $mktime = 'gmmktime';
            $timezone = 0;
        } elseif (preg_match('#([+-])(\d\d)(\d\d)#', $timezone, $matches)) {
            $mktime = 'gmmktime';
            $timezone = 60 * $matches[3] + 3600 * $matches[2];
            if ($matches[1] == '-') {
                $timezone = -$timezone;
            }
        } else {
            $mktime = 'mktime';
            $timezone = 0;
        }

        return @$mktime((int)$hour, (int)$minute, (int)$second, (int)$month, (int)$day, (int)$year) + $timezone;
    }


    /**
     * BER-decode the time (using DateTime)
     *
     * Called by _decode_ber() and in the case of implicit tags asn1map().
     *
     * @access private
     * @param string $content
     * @param int $tag
     * @return string
     */
    function _decodeDateTime($content, $tag)
    {
        /* UTCTime:
           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
           http://www.obj-sys.com/asn1tutorial/node15.html

           GeneralizedTime:
           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
           http://www.obj-sys.com/asn1tutorial/node14.html */

        $format = 'YmdHis';

        if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
            // https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=28 says "the seconds
            // element shall always be present" but none-the-less I've seen X509 certs where it isn't and if the
            // browsers parse it phpseclib ought to too
            if (preg_match('#^(\d{10})(Z|[+-]\d{4})$#', $content, $matches)) {
                $content = $matches[1] . '00' . $matches[2];
            }
            $prefix = substr($content, 0, 2) >= 50 ? '19' : '20';
            $content = $prefix . $content;
        } elseif (strpos($content, '.') !== false) {
            $format.= '.u';
        }

        if ($content[strlen($content) - 1] == 'Z') {
            $content = substr($content, 0, -1) . '+0000';
        }

        if (strpos($content, '-') !== false || strpos($content, '+') !== false) {
            $format.= 'O';
        }

        // error supression isn't necessary as of PHP 7.0:
        // http://php.net/manual/en/migration70.other-changes.php
        return @DateTime::createFromFormat($format, $content);
    }

    /**
     * Set the time format
     *
     * Sets the time / date format for asn1map().
     *
     * @access public
     * @param string $format
     */
    function setTimeFormat($format)
    {
        $this->format = $format;
    }

    /**
     * Load OIDs
     *
     * Load the relevant OIDs for a particular ASN.1 semantic mapping.
     *
     * @access public
     * @param array $oids
     */
    function loadOIDs($oids)
    {
        $this->oids = $oids;
    }

    /**
     * Load filters
     *
     * See File_X509, etc, for an example.
     *
     * @access public
     * @param array $filters
     */
    function loadFilters($filters)
    {
        $this->filters = $filters;
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }

    /**
     * String type conversion
     *
     * This is a lazy conversion, dealing only with character size.
     * No real conversion table is used.
     *
     * @param string $in
     * @param int $from
     * @param int $to
     * @return string
     * @access public
     */
    function convert($in, $from = FILE_ASN1_TYPE_UTF8_STRING, $to = FILE_ASN1_TYPE_UTF8_STRING)
    {
        if (!isset($this->stringTypeSize[$from]) || !isset($this->stringTypeSize[$to])) {
            return false;
        }
        $insize = $this->stringTypeSize[$from];
        $outsize = $this->stringTypeSize[$to];
        $inlength = strlen($in);
        $out = '';

        for ($i = 0; $i < $inlength;) {
            if ($inlength - $i < $insize) {
                return false;
            }

            // Get an input character as a 32-bit value.
            $c = ord($in[$i++]);
            switch (true) {
                case $insize == 4:
                    $c = ($c << 8) | ord($in[$i++]);
                    $c = ($c << 8) | ord($in[$i++]);
                case $insize == 2:
                    $c = ($c << 8) | ord($in[$i++]);
                case $insize == 1:
                    break;
                case ($c & 0x80) == 0x00:
                    break;
                case ($c & 0x40) == 0x00:
                    return false;
                default:
                    $bit = 6;
                    do {
                        if ($bit > 25 || $i >= $inlength || (ord($in[$i]) & 0xC0) != 0x80) {
                            return false;
                        }
                        $c = ($c << 6) | (ord($in[$i++]) & 0x3F);
                        $bit += 5;
                        $mask = 1 << $bit;
                    } while ($c & $bit);
                    $c &= $mask - 1;
                    break;
            }

            // Convert and append the character to output string.
            $v = '';
            switch (true) {
                case $outsize == 4:
                    $v .= chr($c & 0xFF);
                    $c >>= 8;
                    $v .= chr($c & 0xFF);
                    $c >>= 8;
                case $outsize == 2:
                    $v .= chr($c & 0xFF);
                    $c >>= 8;
                case $outsize == 1:
                    $v .= chr($c & 0xFF);
                    $c >>= 8;
                    if ($c) {
                        return false;
                    }
                    break;
                case ($c & 0x80000000) != 0:
                    return false;
                case $c >= 0x04000000:
                    $v .= chr(0x80 | ($c & 0x3F));
                    $c = ($c >> 6) | 0x04000000;
                case $c >= 0x00200000:
                    $v .= chr(0x80 | ($c & 0x3F));
                    $c = ($c >> 6) | 0x00200000;
                case $c >= 0x00010000:
                    $v .= chr(0x80 | ($c & 0x3F));
                    $c = ($c >> 6) | 0x00010000;
                case $c >= 0x00000800:
                    $v .= chr(0x80 | ($c & 0x3F));
                    $c = ($c >> 6) | 0x00000800;
                case $c >= 0x00000080:
                    $v .= chr(0x80 | ($c & 0x3F));
                    $c = ($c >> 6) | 0x000000C0;
                default:
                    $v .= chr($c);
                    break;
            }
            $out .= strrev($v);
        }
        return $out;
    }
}
phpseclib-1.0.18/phpseclib/File/X509.php000066400000000000000000005702161354156543400176050ustar00rootroot00000000000000
 * @copyright 2012 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include File_ASN1
 */
if (!class_exists('File_ASN1')) {
    include_once 'ASN1.php';
}

/**
 * Flag to only accept signatures signed by certificate authorities
 *
 * Not really used anymore but retained all the same to suppress E_NOTICEs from old installs
 *
 * @access public
 */
define('FILE_X509_VALIDATE_SIGNATURE_BY_CA', 1);

/**#@+
 * @access public
 * @see self::getDN()
 */
/**
 * Return internal array representation
 */
define('FILE_X509_DN_ARRAY', 0);
/**
 * Return string
 */
define('FILE_X509_DN_STRING', 1);
/**
 * Return ASN.1 name string
 */
define('FILE_X509_DN_ASN1', 2);
/**
 * Return OpenSSL compatible array
 */
define('FILE_X509_DN_OPENSSL', 3);
/**
 * Return canonical ASN.1 RDNs string
 */
define('FILE_X509_DN_CANON', 4);
/**
 * Return name hash for file indexing
 */
define('FILE_X509_DN_HASH', 5);
/**#@-*/

/**#@+
 * @access public
 * @see self::saveX509()
 * @see self::saveCSR()
 * @see self::saveCRL()
 */
/**
 * Save as PEM
 *
 * ie. a base64-encoded PEM with a header and a footer
 */
define('FILE_X509_FORMAT_PEM', 0);
/**
 * Save as DER
 */
define('FILE_X509_FORMAT_DER', 1);
/**
 * Save as a SPKAC
 *
 * Only works on CSRs. Not currently supported.
 */
define('FILE_X509_FORMAT_SPKAC', 2);
/**
 * Auto-detect the format
 *
 * Used only by the load*() functions
 */
define('FILE_X509_FORMAT_AUTO_DETECT', 3);
/**#@-*/

/**
 * Attribute value disposition.
 * If disposition is >= 0, this is the index of the target value.
 */
define('FILE_X509_ATTR_ALL', -1); // All attribute values (array).
define('FILE_X509_ATTR_APPEND', -2); // Add a value.
define('FILE_X509_ATTR_REPLACE', -3); // Clear first, then add a value.

/**
 * Pure-PHP X.509 Parser
 *
 * @package File_X509
 * @author  Jim Wigginton 
 * @access  public
 */
class File_X509
{
    /**
     * ASN.1 syntax for X.509 certificates
     *
     * @var array
     * @access private
     */
    var $Certificate;

    /**#@+
     * ASN.1 syntax for various extensions
     *
     * @access private
     */
    var $DirectoryString;
    var $PKCS9String;
    var $AttributeValue;
    var $Extensions;
    var $KeyUsage;
    var $ExtKeyUsageSyntax;
    var $BasicConstraints;
    var $KeyIdentifier;
    var $CRLDistributionPoints;
    var $AuthorityKeyIdentifier;
    var $CertificatePolicies;
    var $AuthorityInfoAccessSyntax;
    var $SubjectAltName;
    var $SubjectDirectoryAttributes;
    var $PrivateKeyUsagePeriod;
    var $IssuerAltName;
    var $PolicyMappings;
    var $NameConstraints;

    var $CPSuri;
    var $UserNotice;

    var $netscape_cert_type;
    var $netscape_comment;
    var $netscape_ca_policy_url;

    var $Name;
    var $RelativeDistinguishedName;
    var $CRLNumber;
    var $CRLReason;
    var $IssuingDistributionPoint;
    var $InvalidityDate;
    var $CertificateIssuer;
    var $HoldInstructionCode;
    var $SignedPublicKeyAndChallenge;
    /**#@-*/

    /**#@+
     * ASN.1 syntax for various DN attributes
     *
     * @access private
     */
    var $PostalAddress;
    /**#@-*/

    /**
     * ASN.1 syntax for Certificate Signing Requests (RFC2986)
     *
     * @var array
     * @access private
     */
    var $CertificationRequest;

    /**
     * ASN.1 syntax for Certificate Revocation Lists (RFC5280)
     *
     * @var array
     * @access private
     */
    var $CertificateList;

    /**
     * Distinguished Name
     *
     * @var array
     * @access private
     */
    var $dn;

    /**
     * Public key
     *
     * @var string
     * @access private
     */
    var $publicKey;

    /**
     * Private key
     *
     * @var string
     * @access private
     */
    var $privateKey;

    /**
     * Object identifiers for X.509 certificates
     *
     * @var array
     * @access private
     * @link http://en.wikipedia.org/wiki/Object_identifier
     */
    var $oids;

    /**
     * The certificate authorities
     *
     * @var array
     * @access private
     */
    var $CAs;

    /**
     * The currently loaded certificate
     *
     * @var array
     * @access private
     */
    var $currentCert;

    /**
     * The signature subject
     *
     * There's no guarantee File_X509 is going to re-encode an X.509 cert in the same way it was originally
     * encoded so we take save the portion of the original cert that the signature would have made for.
     *
     * @var string
     * @access private
     */
    var $signatureSubject;

    /**
     * Certificate Start Date
     *
     * @var string
     * @access private
     */
    var $startDate;

    /**
     * Certificate End Date
     *
     * @var string
     * @access private
     */
    var $endDate;

    /**
     * Serial Number
     *
     * @var string
     * @access private
     */
    var $serialNumber;

    /**
     * Key Identifier
     *
     * See {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.1 RFC5280#section-4.2.1.1} and
     * {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.2 RFC5280#section-4.2.1.2}.
     *
     * @var string
     * @access private
     */
    var $currentKeyIdentifier;

    /**
     * CA Flag
     *
     * @var bool
     * @access private
     */
    var $caFlag = false;

    /**
     * SPKAC Challenge
     *
     * @var string
     * @access private
     */
    var $challenge;

    /**
     * Recursion Limit
     *
     * @var int
     * @access private
     */
    var $recur_limit = 5;

    /**
     * URL fetch flag
     *
     * @var bool
     * @access private
     */
    var $disable_url_fetch = false;

    /**
     * Default Constructor.
     *
     * @return File_X509
     * @access public
     */
    function __construct()
    {
        if (!class_exists('Math_BigInteger')) {
            include_once 'Math/BigInteger.php';
        }

        // Explicitly Tagged Module, 1988 Syntax
        // http://tools.ietf.org/html/rfc5280#appendix-A.1

        $this->DirectoryString = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'teletexString'   => array('type' => FILE_ASN1_TYPE_TELETEX_STRING),
                'printableString' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING),
                'universalString' => array('type' => FILE_ASN1_TYPE_UNIVERSAL_STRING),
                'utf8String'      => array('type' => FILE_ASN1_TYPE_UTF8_STRING),
                'bmpString'       => array('type' => FILE_ASN1_TYPE_BMP_STRING)
            )
        );

        $this->PKCS9String = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'ia5String'       => array('type' => FILE_ASN1_TYPE_IA5_STRING),
                'directoryString' => $this->DirectoryString
            )
        );

        $this->AttributeValue = array('type' => FILE_ASN1_TYPE_ANY);

        $AttributeType = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);

        $AttributeTypeAndValue = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'type' => $AttributeType,
                'value'=> $this->AttributeValue
            )
        );

        /*
        In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare,
        but they can be useful at times when either there is no unique attribute in the entry or you
        want to ensure that the entry's DN contains some useful identifying information.

        - https://www.opends.org/wiki/page/DefinitionRelativeDistinguishedName
        */
        $this->RelativeDistinguishedName = array(
            'type'     => FILE_ASN1_TYPE_SET,
            'min'      => 1,
            'max'      => -1,
            'children' => $AttributeTypeAndValue
        );

        // http://tools.ietf.org/html/rfc5280#section-4.1.2.4
        $RDNSequence = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            // RDNSequence does not define a min or a max, which means it doesn't have one
            'min'      => 0,
            'max'      => -1,
            'children' => $this->RelativeDistinguishedName
        );

        $this->Name = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'rdnSequence' => $RDNSequence
            )
        );

        // http://tools.ietf.org/html/rfc5280#section-4.1.1.2
        $AlgorithmIdentifier = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'algorithm'  => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
                'parameters' => array(
                                    'type'     => FILE_ASN1_TYPE_ANY,
                                    'optional' => true
                                )
            )
        );

        /*
           A certificate using system MUST reject the certificate if it encounters
           a critical extension it does not recognize; however, a non-critical
           extension may be ignored if it is not recognized.

           http://tools.ietf.org/html/rfc5280#section-4.2
        */
        $Extension = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'extnId'   => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
                'critical' => array(
                                  'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                  'optional' => true,
                                  'default'  => false
                              ),
                'extnValue' => array('type' => FILE_ASN1_TYPE_OCTET_STRING)
            )
        );

        $this->Extensions = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            // technically, it's MAX, but we'll assume anything < 0 is MAX
            'max'      => -1,
            // if 'children' isn't an array then 'min' and 'max' must be defined
            'children' => $Extension
        );

        $SubjectPublicKeyInfo = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'algorithm'        => $AlgorithmIdentifier,
                'subjectPublicKey' => array('type' => FILE_ASN1_TYPE_BIT_STRING)
            )
        );

        $UniqueIdentifier = array('type' => FILE_ASN1_TYPE_BIT_STRING);

        $Time = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'utcTime'     => array('type' => FILE_ASN1_TYPE_UTC_TIME),
                'generalTime' => array('type' => FILE_ASN1_TYPE_GENERALIZED_TIME)
            )
        );

        // http://tools.ietf.org/html/rfc5280#section-4.1.2.5
        $Validity = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'notBefore' => $Time,
                'notAfter'  => $Time
            )
        );

        $CertificateSerialNumber = array('type' => FILE_ASN1_TYPE_INTEGER);

        $Version = array(
            'type'    => FILE_ASN1_TYPE_INTEGER,
            'mapping' => array('v1', 'v2', 'v3')
        );

        // assert($TBSCertificate['children']['signature'] == $Certificate['children']['signatureAlgorithm'])
        $TBSCertificate = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                // technically, default implies optional, but we'll define it as being optional, none-the-less, just to
                // reenforce that fact
                'version'             => array(
                                             'constant' => 0,
                                             'optional' => true,
                                             'explicit' => true,
                                             'default'  => 'v1'
                                         ) + $Version,
                'serialNumber'         => $CertificateSerialNumber,
                'signature'            => $AlgorithmIdentifier,
                'issuer'               => $this->Name,
                'validity'             => $Validity,
                'subject'              => $this->Name,
                'subjectPublicKeyInfo' => $SubjectPublicKeyInfo,
                // implicit means that the T in the TLV structure is to be rewritten, regardless of the type
                'issuerUniqueID'       => array(
                                               'constant' => 1,
                                               'optional' => true,
                                               'implicit' => true
                                           ) + $UniqueIdentifier,
                'subjectUniqueID'       => array(
                                               'constant' => 2,
                                               'optional' => true,
                                               'implicit' => true
                                           ) + $UniqueIdentifier,
                //  doesn't use the EXPLICIT keyword but if
                // it's not IMPLICIT, it's EXPLICIT
                'extensions'            => array(
                                               'constant' => 3,
                                               'optional' => true,
                                               'explicit' => true
                                           ) + $this->Extensions
            )
        );

        $this->Certificate = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'tbsCertificate'     => $TBSCertificate,
                 'signatureAlgorithm' => $AlgorithmIdentifier,
                 'signature'          => array('type' => FILE_ASN1_TYPE_BIT_STRING)
            )
        );

        $this->KeyUsage = array(
            'type'    => FILE_ASN1_TYPE_BIT_STRING,
            'mapping' => array(
                'digitalSignature',
                'nonRepudiation',
                'keyEncipherment',
                'dataEncipherment',
                'keyAgreement',
                'keyCertSign',
                'cRLSign',
                'encipherOnly',
                'decipherOnly'
            )
        );

        $this->BasicConstraints = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'cA'                => array(
                                                 'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                                 'optional' => true,
                                                 'default'  => false
                                       ),
                'pathLenConstraint' => array(
                                                 'type' => FILE_ASN1_TYPE_INTEGER,
                                                 'optional' => true
                                       )
            )
        );

        $this->KeyIdentifier = array('type' => FILE_ASN1_TYPE_OCTET_STRING);

        $OrganizationalUnitNames = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => 4, // ub-organizational-units
            'children' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
        );

        $PersonalName = array(
            'type'     => FILE_ASN1_TYPE_SET,
            'children' => array(
                'surname'              => array(
                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
                                           'constant' => 0,
                                           'optional' => true,
                                           'implicit' => true
                                         ),
                'given-name'           => array(
                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
                                           'constant' => 1,
                                           'optional' => true,
                                           'implicit' => true
                                         ),
                'initials'             => array(
                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
                                           'constant' => 2,
                                           'optional' => true,
                                           'implicit' => true
                                         ),
                'generation-qualifier' => array(
                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
                                           'constant' => 3,
                                           'optional' => true,
                                           'implicit' => true
                                         )
            )
        );

        $NumericUserIdentifier = array('type' => FILE_ASN1_TYPE_NUMERIC_STRING);

        $OrganizationName = array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING);

        $PrivateDomainName = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'numeric'   => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
                'printable' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
            )
        );

        $TerminalIdentifier = array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING);

        $NetworkAddress = array('type' => FILE_ASN1_TYPE_NUMERIC_STRING);

        $AdministrationDomainName = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            // if class isn't present it's assumed to be FILE_ASN1_CLASS_UNIVERSAL or
            // (if constant is present) FILE_ASN1_CLASS_CONTEXT_SPECIFIC
            'class'    => FILE_ASN1_CLASS_APPLICATION,
            'cast'     => 2,
            'children' => array(
                'numeric'   => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
                'printable' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
            )
        );

        $CountryName = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            // if class isn't present it's assumed to be FILE_ASN1_CLASS_UNIVERSAL or
            // (if constant is present) FILE_ASN1_CLASS_CONTEXT_SPECIFIC
            'class'    => FILE_ASN1_CLASS_APPLICATION,
            'cast'     => 1,
            'children' => array(
                'x121-dcc-code'        => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
                'iso-3166-alpha2-code' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
            )
        );

        $AnotherName = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'type-id' => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
                 'value'   => array(
                                  'type' => FILE_ASN1_TYPE_ANY,
                                  'constant' => 0,
                                  'optional' => true,
                                  'explicit' => true
                              )
            )
        );

        $ExtensionAttribute = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'extension-attribute-type'  => array(
                                                    'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
                                                    'constant' => 0,
                                                    'optional' => true,
                                                    'implicit' => true
                                                ),
                 'extension-attribute-value' => array(
                                                    'type' => FILE_ASN1_TYPE_ANY,
                                                    'constant' => 1,
                                                    'optional' => true,
                                                    'explicit' => true
                                                )
            )
        );

        $ExtensionAttributes = array(
            'type'     => FILE_ASN1_TYPE_SET,
            'min'      => 1,
            'max'      => 256, // ub-extension-attributes
            'children' => $ExtensionAttribute
        );

        $BuiltInDomainDefinedAttribute = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'type'  => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING),
                 'value' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
            )
        );

        $BuiltInDomainDefinedAttributes = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => 4, // ub-domain-defined-attributes
            'children' => $BuiltInDomainDefinedAttribute
        );

        $BuiltInStandardAttributes =  array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'country-name'               => array('optional' => true) + $CountryName,
                'administration-domain-name' => array('optional' => true) + $AdministrationDomainName,
                'network-address'            => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $NetworkAddress,
                'terminal-identifier'        => array(
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $TerminalIdentifier,
                'private-domain-name'        => array(
                                                 'constant' => 2,
                                                 'optional' => true,
                                                 'explicit' => true
                                               ) + $PrivateDomainName,
                'organization-name'          => array(
                                                 'constant' => 3,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $OrganizationName,
                'numeric-user-identifier'    => array(
                                                 'constant' => 4,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $NumericUserIdentifier,
                'personal-name'              => array(
                                                 'constant' => 5,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $PersonalName,
                'organizational-unit-names'  => array(
                                                 'constant' => 6,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $OrganizationalUnitNames
            )
        );

        $ORAddress = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'built-in-standard-attributes'       => $BuiltInStandardAttributes,
                 'built-in-domain-defined-attributes' => array('optional' => true) + $BuiltInDomainDefinedAttributes,
                 'extension-attributes'               => array('optional' => true) + $ExtensionAttributes
            )
        );

        $EDIPartyName = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                 'nameAssigner' => array(
                                    'constant' => 0,
                                    'optional' => true,
                                    'implicit' => true
                                ) + $this->DirectoryString,
                 // partyName is technically required but File_ASN1 doesn't currently support non-optional constants and
                 // setting it to optional gets the job done in any event.
                 'partyName'    => array(
                                    'constant' => 1,
                                    'optional' => true,
                                    'implicit' => true
                                ) + $this->DirectoryString
            )
        );

        $GeneralName = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'otherName'                 => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $AnotherName,
                'rfc822Name'                => array(
                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ),
                'dNSName'                   => array(
                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
                                                 'constant' => 2,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ),
                'x400Address'               => array(
                                                 'constant' => 3,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $ORAddress,
                'directoryName'             => array(
                                                 'constant' => 4,
                                                 'optional' => true,
                                                 'explicit' => true
                                               ) + $this->Name,
                'ediPartyName'              => array(
                                                 'constant' => 5,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $EDIPartyName,
                'uniformResourceIdentifier' => array(
                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
                                                 'constant' => 6,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ),
                'iPAddress'                 => array(
                                                 'type' => FILE_ASN1_TYPE_OCTET_STRING,
                                                 'constant' => 7,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ),
                'registeredID'              => array(
                                                 'type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER,
                                                 'constant' => 8,
                                                 'optional' => true,
                                                 'implicit' => true
                                               )
            )
        );

        $GeneralNames = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $GeneralName
        );

        $this->IssuerAltName = $GeneralNames;

        $ReasonFlags = array(
            'type'    => FILE_ASN1_TYPE_BIT_STRING,
            'mapping' => array(
                'unused',
                'keyCompromise',
                'cACompromise',
                'affiliationChanged',
                'superseded',
                'cessationOfOperation',
                'certificateHold',
                'privilegeWithdrawn',
                'aACompromise'
            )
        );

        $DistributionPointName = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'fullName'                => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'implicit' => true
                                       ) + $GeneralNames,
                'nameRelativeToCRLIssuer' => array(
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true
                                       ) + $this->RelativeDistinguishedName
            )
        );

        $DistributionPoint = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'distributionPoint' => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'explicit' => true
                                       ) + $DistributionPointName,
                'reasons'           => array(
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true
                                       ) + $ReasonFlags,
                'cRLIssuer'         => array(
                                                 'constant' => 2,
                                                 'optional' => true,
                                                 'implicit' => true
                                       ) + $GeneralNames
            )
        );

        $this->CRLDistributionPoints = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $DistributionPoint
        );

        $this->AuthorityKeyIdentifier = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'keyIdentifier'             => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $this->KeyIdentifier,
                'authorityCertIssuer'       => array(
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $GeneralNames,
                'authorityCertSerialNumber' => array(
                                                 'constant' => 2,
                                                 'optional' => true,
                                                 'implicit' => true
                                               ) + $CertificateSerialNumber
            )
        );

        $PolicyQualifierId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);

        $PolicyQualifierInfo = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'policyQualifierId' => $PolicyQualifierId,
                'qualifier'         => array('type' => FILE_ASN1_TYPE_ANY)
            )
        );

        $CertPolicyId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);

        $PolicyInformation = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'policyIdentifier' => $CertPolicyId,
                'policyQualifiers' => array(
                                          'type'     => FILE_ASN1_TYPE_SEQUENCE,
                                          'min'      => 0,
                                          'max'      => -1,
                                          'optional' => true,
                                          'children' => $PolicyQualifierInfo
                                      )
            )
        );

        $this->CertificatePolicies = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $PolicyInformation
        );

        $this->PolicyMappings = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => array(
                              'type'     => FILE_ASN1_TYPE_SEQUENCE,
                              'children' => array(
                                  'issuerDomainPolicy' => $CertPolicyId,
                                  'subjectDomainPolicy' => $CertPolicyId
                              )
                       )
        );

        $KeyPurposeId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);

        $this->ExtKeyUsageSyntax = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $KeyPurposeId
        );

        $AccessDescription = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'accessMethod'   => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
                'accessLocation' => $GeneralName
            )
        );

        $this->AuthorityInfoAccessSyntax = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $AccessDescription
        );

        $this->SubjectInfoAccessSyntax = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $AccessDescription
        );

        $this->SubjectAltName = $GeneralNames;

        $this->PrivateKeyUsagePeriod = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'notBefore' => array(
                                                 'constant' => 0,
                                                 'optional' => true,
                                                 'implicit' => true,
                                                 'type' => FILE_ASN1_TYPE_GENERALIZED_TIME),
                'notAfter'  => array(
                                                 'constant' => 1,
                                                 'optional' => true,
                                                 'implicit' => true,
                                                 'type' => FILE_ASN1_TYPE_GENERALIZED_TIME)
            )
        );

        $BaseDistance = array('type' => FILE_ASN1_TYPE_INTEGER);

        $GeneralSubtree = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'base'    => $GeneralName,
                'minimum' => array(
                                 'constant' => 0,
                                 'optional' => true,
                                 'implicit' => true,
                                 'default' => new Math_BigInteger(0)
                             ) + $BaseDistance,
                'maximum' => array(
                                 'constant' => 1,
                                 'optional' => true,
                                 'implicit' => true,
                             ) + $BaseDistance
            )
        );

        $GeneralSubtrees = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $GeneralSubtree
        );

        $this->NameConstraints = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'permittedSubtrees' => array(
                                           'constant' => 0,
                                           'optional' => true,
                                           'implicit' => true
                                       ) + $GeneralSubtrees,
                'excludedSubtrees'  => array(
                                           'constant' => 1,
                                           'optional' => true,
                                           'implicit' => true
                                       ) + $GeneralSubtrees
            )
        );

        $this->CPSuri = array('type' => FILE_ASN1_TYPE_IA5_STRING);

        $DisplayText = array(
            'type'     => FILE_ASN1_TYPE_CHOICE,
            'children' => array(
                'ia5String'     => array('type' => FILE_ASN1_TYPE_IA5_STRING),
                'visibleString' => array('type' => FILE_ASN1_TYPE_VISIBLE_STRING),
                'bmpString'     => array('type' => FILE_ASN1_TYPE_BMP_STRING),
                'utf8String'    => array('type' => FILE_ASN1_TYPE_UTF8_STRING)
            )
        );

        $NoticeReference = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'organization'  => $DisplayText,
                'noticeNumbers' => array(
                                       'type'     => FILE_ASN1_TYPE_SEQUENCE,
                                       'min'      => 1,
                                       'max'      => 200,
                                       'children' => array('type' => FILE_ASN1_TYPE_INTEGER)
                                   )
            )
        );

        $this->UserNotice = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'noticeRef' => array(
                                           'optional' => true,
                                           'implicit' => true
                                       ) + $NoticeReference,
                'explicitText'  => array(
                                           'optional' => true,
                                           'implicit' => true
                                       ) + $DisplayText
            )
        );

        // mapping is from 
        $this->netscape_cert_type = array(
            'type'    => FILE_ASN1_TYPE_BIT_STRING,
            'mapping' => array(
                'SSLClient',
                'SSLServer',
                'Email',
                'ObjectSigning',
                'Reserved',
                'SSLCA',
                'EmailCA',
                'ObjectSigningCA'
            )
        );

        $this->netscape_comment = array('type' => FILE_ASN1_TYPE_IA5_STRING);
        $this->netscape_ca_policy_url = array('type' => FILE_ASN1_TYPE_IA5_STRING);

        // attribute is used in RFC2986 but we're using the RFC5280 definition

        $Attribute = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'type' => $AttributeType,
                'value'=> array(
                              'type'     => FILE_ASN1_TYPE_SET,
                              'min'      => 1,
                              'max'      => -1,
                              'children' => $this->AttributeValue
                          )
            )
        );

        $this->SubjectDirectoryAttributes = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'min'      => 1,
            'max'      => -1,
            'children' => $Attribute
        );

        // adapted from 

        $Attributes = array(
            'type'     => FILE_ASN1_TYPE_SET,
            'min'      => 1,
            'max'      => -1,
            'children' => $Attribute
        );

        $CertificationRequestInfo = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'version'       => array(
                                       'type' => FILE_ASN1_TYPE_INTEGER,
                                       'mapping' => array('v1')
                                   ),
                'subject'       => $this->Name,
                'subjectPKInfo' => $SubjectPublicKeyInfo,
                'attributes'    => array(
                                       'constant' => 0,
                                       'optional' => true,
                                       'implicit' => true
                                   ) + $Attributes,
            )
        );

        $this->CertificationRequest = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'certificationRequestInfo' => $CertificationRequestInfo,
                'signatureAlgorithm'       => $AlgorithmIdentifier,
                'signature'                => array('type' => FILE_ASN1_TYPE_BIT_STRING)
            )
        );

        $RevokedCertificate = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                              'userCertificate'    => $CertificateSerialNumber,
                              'revocationDate'     => $Time,
                              'crlEntryExtensions' => array(
                                                          'optional' => true
                                                      ) + $this->Extensions
                          )
        );

        $TBSCertList = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'version'             => array(
                                             'optional' => true,
                                             'default'  => 'v1'
                                         ) + $Version,
                'signature'           => $AlgorithmIdentifier,
                'issuer'              => $this->Name,
                'thisUpdate'          => $Time,
                'nextUpdate'          => array(
                                             'optional' => true
                                         ) + $Time,
                'revokedCertificates' => array(
                                             'type'     => FILE_ASN1_TYPE_SEQUENCE,
                                             'optional' => true,
                                             'min'      => 0,
                                             'max'      => -1,
                                             'children' => $RevokedCertificate
                                         ),
                'crlExtensions'       => array(
                                             'constant' => 0,
                                             'optional' => true,
                                             'explicit' => true
                                         ) + $this->Extensions
            )
        );

        $this->CertificateList = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'tbsCertList'        => $TBSCertList,
                'signatureAlgorithm' => $AlgorithmIdentifier,
                'signature'          => array('type' => FILE_ASN1_TYPE_BIT_STRING)
            )
        );

        $this->CRLNumber = array('type' => FILE_ASN1_TYPE_INTEGER);

        $this->CRLReason = array('type' => FILE_ASN1_TYPE_ENUMERATED,
           'mapping' => array(
                            'unspecified',
                            'keyCompromise',
                            'cACompromise',
                            'affiliationChanged',
                            'superseded',
                            'cessationOfOperation',
                            'certificateHold',
                            // Value 7 is not used.
                            8 => 'removeFromCRL',
                            'privilegeWithdrawn',
                            'aACompromise'
            )
        );

        $this->IssuingDistributionPoint = array('type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'distributionPoint'          => array(
                                                    'constant' => 0,
                                                    'optional' => true,
                                                    'explicit' => true
                                                ) + $DistributionPointName,
                'onlyContainsUserCerts'      => array(
                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                                    'constant' => 1,
                                                    'optional' => true,
                                                    'default'  => false,
                                                    'implicit' => true
                                                ),
                'onlyContainsCACerts'        => array(
                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                                    'constant' => 2,
                                                    'optional' => true,
                                                    'default'  => false,
                                                    'implicit' => true
                                                ),
                'onlySomeReasons'           => array(
                                                    'constant' => 3,
                                                    'optional' => true,
                                                    'implicit' => true
                                                ) + $ReasonFlags,
                'indirectCRL'               => array(
                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                                    'constant' => 4,
                                                    'optional' => true,
                                                    'default'  => false,
                                                    'implicit' => true
                                                ),
                'onlyContainsAttributeCerts' => array(
                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
                                                    'constant' => 5,
                                                    'optional' => true,
                                                    'default'  => false,
                                                    'implicit' => true
                                                )
                          )
        );

        $this->InvalidityDate = array('type' => FILE_ASN1_TYPE_GENERALIZED_TIME);

        $this->CertificateIssuer = $GeneralNames;

        $this->HoldInstructionCode = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);

        $PublicKeyAndChallenge = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'spki'      => $SubjectPublicKeyInfo,
                'challenge' => array('type' => FILE_ASN1_TYPE_IA5_STRING)
            )
        );

        $this->SignedPublicKeyAndChallenge = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'publicKeyAndChallenge' => $PublicKeyAndChallenge,
                'signatureAlgorithm'    => $AlgorithmIdentifier,
                'signature'             => array('type' => FILE_ASN1_TYPE_BIT_STRING)
            )
        );

        $this->PostalAddress = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'optional' => true,
            'min'      => 1,
            'max'      => -1,
            'children' => $this->DirectoryString
        );

        // OIDs from RFC5280 and those RFCs mentioned in RFC5280#section-4.1.1.2
        $this->oids = array(
            '1.3.6.1.5.5.7' => 'id-pkix',
            '1.3.6.1.5.5.7.1' => 'id-pe',
            '1.3.6.1.5.5.7.2' => 'id-qt',
            '1.3.6.1.5.5.7.3' => 'id-kp',
            '1.3.6.1.5.5.7.48' => 'id-ad',
            '1.3.6.1.5.5.7.2.1' => 'id-qt-cps',
            '1.3.6.1.5.5.7.2.2' => 'id-qt-unotice',
            '1.3.6.1.5.5.7.48.1' =>'id-ad-ocsp',
            '1.3.6.1.5.5.7.48.2' => 'id-ad-caIssuers',
            '1.3.6.1.5.5.7.48.3' => 'id-ad-timeStamping',
            '1.3.6.1.5.5.7.48.5' => 'id-ad-caRepository',
            '2.5.4' => 'id-at',
            '2.5.4.41' => 'id-at-name',
            '2.5.4.4' => 'id-at-surname',
            '2.5.4.42' => 'id-at-givenName',
            '2.5.4.43' => 'id-at-initials',
            '2.5.4.44' => 'id-at-generationQualifier',
            '2.5.4.3' => 'id-at-commonName',
            '2.5.4.7' => 'id-at-localityName',
            '2.5.4.8' => 'id-at-stateOrProvinceName',
            '2.5.4.10' => 'id-at-organizationName',
            '2.5.4.11' => 'id-at-organizationalUnitName',
            '2.5.4.12' => 'id-at-title',
            '2.5.4.13' => 'id-at-description',
            '2.5.4.46' => 'id-at-dnQualifier',
            '2.5.4.6' => 'id-at-countryName',
            '2.5.4.5' => 'id-at-serialNumber',
            '2.5.4.65' => 'id-at-pseudonym',
            '2.5.4.17' => 'id-at-postalCode',
            '2.5.4.9' => 'id-at-streetAddress',
            '2.5.4.45' => 'id-at-uniqueIdentifier',
            '2.5.4.72' => 'id-at-role',
            '2.5.4.16' => 'id-at-postalAddress',

            '0.9.2342.19200300.100.1.25' => 'id-domainComponent',
            '1.2.840.113549.1.9' => 'pkcs-9',
            '1.2.840.113549.1.9.1' => 'pkcs-9-at-emailAddress',
            '2.5.29' => 'id-ce',
            '2.5.29.35' => 'id-ce-authorityKeyIdentifier',
            '2.5.29.14' => 'id-ce-subjectKeyIdentifier',
            '2.5.29.15' => 'id-ce-keyUsage',
            '2.5.29.16' => 'id-ce-privateKeyUsagePeriod',
            '2.5.29.32' => 'id-ce-certificatePolicies',
            '2.5.29.32.0' => 'anyPolicy',

            '2.5.29.33' => 'id-ce-policyMappings',
            '2.5.29.17' => 'id-ce-subjectAltName',
            '2.5.29.18' => 'id-ce-issuerAltName',
            '2.5.29.9' => 'id-ce-subjectDirectoryAttributes',
            '2.5.29.19' => 'id-ce-basicConstraints',
            '2.5.29.30' => 'id-ce-nameConstraints',
            '2.5.29.36' => 'id-ce-policyConstraints',
            '2.5.29.31' => 'id-ce-cRLDistributionPoints',
            '2.5.29.37' => 'id-ce-extKeyUsage',
            '2.5.29.37.0' => 'anyExtendedKeyUsage',
            '1.3.6.1.5.5.7.3.1' => 'id-kp-serverAuth',
            '1.3.6.1.5.5.7.3.2' => 'id-kp-clientAuth',
            '1.3.6.1.5.5.7.3.3' => 'id-kp-codeSigning',
            '1.3.6.1.5.5.7.3.4' => 'id-kp-emailProtection',
            '1.3.6.1.5.5.7.3.8' => 'id-kp-timeStamping',
            '1.3.6.1.5.5.7.3.9' => 'id-kp-OCSPSigning',
            '2.5.29.54' => 'id-ce-inhibitAnyPolicy',
            '2.5.29.46' => 'id-ce-freshestCRL',
            '1.3.6.1.5.5.7.1.1' => 'id-pe-authorityInfoAccess',
            '1.3.6.1.5.5.7.1.11' => 'id-pe-subjectInfoAccess',
            '2.5.29.20' => 'id-ce-cRLNumber',
            '2.5.29.28' => 'id-ce-issuingDistributionPoint',
            '2.5.29.27' => 'id-ce-deltaCRLIndicator',
            '2.5.29.21' => 'id-ce-cRLReasons',
            '2.5.29.29' => 'id-ce-certificateIssuer',
            '2.5.29.23' => 'id-ce-holdInstructionCode',
            '1.2.840.10040.2' => 'holdInstruction',
            '1.2.840.10040.2.1' => 'id-holdinstruction-none',
            '1.2.840.10040.2.2' => 'id-holdinstruction-callissuer',
            '1.2.840.10040.2.3' => 'id-holdinstruction-reject',
            '2.5.29.24' => 'id-ce-invalidityDate',

            '1.2.840.113549.2.2' => 'md2',
            '1.2.840.113549.2.5' => 'md5',
            '1.3.14.3.2.26' => 'id-sha1',
            '1.2.840.10040.4.1' => 'id-dsa',
            '1.2.840.10040.4.3' => 'id-dsa-with-sha1',
            '1.2.840.113549.1.1' => 'pkcs-1',
            '1.2.840.113549.1.1.1' => 'rsaEncryption',
            '1.2.840.113549.1.1.2' => 'md2WithRSAEncryption',
            '1.2.840.113549.1.1.4' => 'md5WithRSAEncryption',
            '1.2.840.113549.1.1.5' => 'sha1WithRSAEncryption',
            '1.2.840.10046.2.1' => 'dhpublicnumber',
            '2.16.840.1.101.2.1.1.22' => 'id-keyExchangeAlgorithm',
            '1.2.840.10045' => 'ansi-X9-62',
            '1.2.840.10045.4' => 'id-ecSigType',
            '1.2.840.10045.4.1' => 'ecdsa-with-SHA1',
            '1.2.840.10045.1' => 'id-fieldType',
            '1.2.840.10045.1.1' => 'prime-field',
            '1.2.840.10045.1.2' => 'characteristic-two-field',
            '1.2.840.10045.1.2.3' => 'id-characteristic-two-basis',
            '1.2.840.10045.1.2.3.1' => 'gnBasis',
            '1.2.840.10045.1.2.3.2' => 'tpBasis',
            '1.2.840.10045.1.2.3.3' => 'ppBasis',
            '1.2.840.10045.2' => 'id-publicKeyType',
            '1.2.840.10045.2.1' => 'id-ecPublicKey',
            '1.2.840.10045.3' => 'ellipticCurve',
            '1.2.840.10045.3.0' => 'c-TwoCurve',
            '1.2.840.10045.3.0.1' => 'c2pnb163v1',
            '1.2.840.10045.3.0.2' => 'c2pnb163v2',
            '1.2.840.10045.3.0.3' => 'c2pnb163v3',
            '1.2.840.10045.3.0.4' => 'c2pnb176w1',
            '1.2.840.10045.3.0.5' => 'c2pnb191v1',
            '1.2.840.10045.3.0.6' => 'c2pnb191v2',
            '1.2.840.10045.3.0.7' => 'c2pnb191v3',
            '1.2.840.10045.3.0.8' => 'c2pnb191v4',
            '1.2.840.10045.3.0.9' => 'c2pnb191v5',
            '1.2.840.10045.3.0.10' => 'c2pnb208w1',
            '1.2.840.10045.3.0.11' => 'c2pnb239v1',
            '1.2.840.10045.3.0.12' => 'c2pnb239v2',
            '1.2.840.10045.3.0.13' => 'c2pnb239v3',
            '1.2.840.10045.3.0.14' => 'c2pnb239v4',
            '1.2.840.10045.3.0.15' => 'c2pnb239v5',
            '1.2.840.10045.3.0.16' => 'c2pnb272w1',
            '1.2.840.10045.3.0.17' => 'c2pnb304w1',
            '1.2.840.10045.3.0.18' => 'c2pnb359v1',
            '1.2.840.10045.3.0.19' => 'c2pnb368w1',
            '1.2.840.10045.3.0.20' => 'c2pnb431r1',
            '1.2.840.10045.3.1' => 'primeCurve',
            '1.2.840.10045.3.1.1' => 'prime192v1',
            '1.2.840.10045.3.1.2' => 'prime192v2',
            '1.2.840.10045.3.1.3' => 'prime192v3',
            '1.2.840.10045.3.1.4' => 'prime239v1',
            '1.2.840.10045.3.1.5' => 'prime239v2',
            '1.2.840.10045.3.1.6' => 'prime239v3',
            '1.2.840.10045.3.1.7' => 'prime256v1',
            '1.2.840.113549.1.1.7' => 'id-RSAES-OAEP',
            '1.2.840.113549.1.1.9' => 'id-pSpecified',
            '1.2.840.113549.1.1.10' => 'id-RSASSA-PSS',
            '1.2.840.113549.1.1.8' => 'id-mgf1',
            '1.2.840.113549.1.1.14' => 'sha224WithRSAEncryption',
            '1.2.840.113549.1.1.11' => 'sha256WithRSAEncryption',
            '1.2.840.113549.1.1.12' => 'sha384WithRSAEncryption',
            '1.2.840.113549.1.1.13' => 'sha512WithRSAEncryption',
            '2.16.840.1.101.3.4.2.4' => 'id-sha224',
            '2.16.840.1.101.3.4.2.1' => 'id-sha256',
            '2.16.840.1.101.3.4.2.2' => 'id-sha384',
            '2.16.840.1.101.3.4.2.3' => 'id-sha512',
            '1.2.643.2.2.4' => 'id-GostR3411-94-with-GostR3410-94',
            '1.2.643.2.2.3' => 'id-GostR3411-94-with-GostR3410-2001',
            '1.2.643.2.2.20' => 'id-GostR3410-2001',
            '1.2.643.2.2.19' => 'id-GostR3410-94',
            // Netscape Object Identifiers from "Netscape Certificate Extensions"
            '2.16.840.1.113730' => 'netscape',
            '2.16.840.1.113730.1' => 'netscape-cert-extension',
            '2.16.840.1.113730.1.1' => 'netscape-cert-type',
            '2.16.840.1.113730.1.13' => 'netscape-comment',
            '2.16.840.1.113730.1.8' => 'netscape-ca-policy-url',
            // the following are X.509 extensions not supported by phpseclib
            '1.3.6.1.5.5.7.1.12' => 'id-pe-logotype',
            '1.2.840.113533.7.65.0' => 'entrustVersInfo',
            '2.16.840.1.113733.1.6.9' => 'verisignPrivate',
            // for Certificate Signing Requests
            // see http://tools.ietf.org/html/rfc2985
            '1.2.840.113549.1.9.2' => 'pkcs-9-at-unstructuredName', // PKCS #9 unstructured name
            '1.2.840.113549.1.9.7' => 'pkcs-9-at-challengePassword', // Challenge password for certificate revocations
            '1.2.840.113549.1.9.14' => 'pkcs-9-at-extensionRequest' // Certificate extension request
        );
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function File_X509()
    {
        $this->__construct();
    }

    /**
     * Load X.509 certificate
     *
     * Returns an associative array describing the X.509 cert or a false if the cert failed to load
     *
     * @param string $cert
     * @param int $mode
     * @access public
     * @return mixed
     */
    function loadX509($cert, $mode = FILE_X509_FORMAT_AUTO_DETECT)
    {
        if (is_array($cert) && isset($cert['tbsCertificate'])) {
            unset($this->currentCert);
            unset($this->currentKeyIdentifier);
            $this->dn = $cert['tbsCertificate']['subject'];
            if (!isset($this->dn)) {
                return false;
            }
            $this->currentCert = $cert;

            $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
            $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;

            unset($this->signatureSubject);

            return $cert;
        }

        $asn1 = new File_ASN1();

        if ($mode != FILE_X509_FORMAT_DER) {
            $newcert = $this->_extractBER($cert);
            if ($mode == FILE_X509_FORMAT_PEM && $cert == $newcert) {
                return false;
            }
            $cert = $newcert;
        }

        if ($cert === false) {
            $this->currentCert = false;
            return false;
        }

        $asn1->loadOIDs($this->oids);
        $decoded = $asn1->decodeBER($cert);

        if (!empty($decoded)) {
            $x509 = $asn1->asn1map($decoded[0], $this->Certificate);
        }
        if (!isset($x509) || $x509 === false) {
            $this->currentCert = false;
            return false;
        }

        $this->signatureSubject = substr($cert, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);

        if ($this->_isSubArrayValid($x509, 'tbsCertificate/extensions')) {
            $this->_mapInExtensions($x509, 'tbsCertificate/extensions', $asn1);
        }
        $this->_mapInDNs($x509, 'tbsCertificate/issuer/rdnSequence', $asn1);
        $this->_mapInDNs($x509, 'tbsCertificate/subject/rdnSequence', $asn1);

        $key = &$x509['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'];
        $key = $this->_reformatKey($x509['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'], $key);

        $this->currentCert = $x509;
        $this->dn = $x509['tbsCertificate']['subject'];

        $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
        $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;

        return $x509;
    }

    /**
     * Save X.509 certificate
     *
     * @param array $cert
     * @param int $format optional
     * @access public
     * @return string
     */
    function saveX509($cert, $format = FILE_X509_FORMAT_PEM)
    {
        if (!is_array($cert) || !isset($cert['tbsCertificate'])) {
            return false;
        }

        switch (true) {
            // "case !$a: case !$b: break; default: whatever();" is the same thing as "if ($a && $b) whatever()"
            case !($algorithm = $this->_subArray($cert, 'tbsCertificate/subjectPublicKeyInfo/algorithm/algorithm')):
            case is_object($cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
                break;
            default:
                switch ($algorithm) {
                    case 'rsaEncryption':
                        $cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']
                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'])));
                        /* "[For RSA keys] the parameters field MUST have ASN.1 type NULL for this algorithm identifier."
                           -- https://tools.ietf.org/html/rfc3279#section-2.3.1

                           given that and the fact that RSA keys appear ot be the only key type for which the parameters field can be blank,
                           it seems like perhaps the ASN.1 description ought not say the parameters field is OPTIONAL, but whatever.
                         */
                        $cert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['parameters'] = null;
                        // https://tools.ietf.org/html/rfc3279#section-2.2.1
                        $cert['signatureAlgorithm']['parameters'] = null;
                        $cert['tbsCertificate']['signature']['parameters'] = null;
                }
        }

        $asn1 = new File_ASN1();
        $asn1->loadOIDs($this->oids);

        $filters = array();
        $type_utf8_string = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
        $filters['tbsCertificate']['signature']['parameters'] = $type_utf8_string;
        $filters['tbsCertificate']['signature']['issuer']['rdnSequence']['value'] = $type_utf8_string;
        $filters['tbsCertificate']['issuer']['rdnSequence']['value'] = $type_utf8_string;
        $filters['tbsCertificate']['subject']['rdnSequence']['value'] = $type_utf8_string;
        $filters['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['parameters'] = $type_utf8_string;
        $filters['signatureAlgorithm']['parameters'] = $type_utf8_string;
        $filters['authorityCertIssuer']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
        //$filters['policyQualifiers']['qualifier'] = $type_utf8_string;
        $filters['distributionPoint']['fullName']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
        $filters['directoryName']['rdnSequence']['value'] = $type_utf8_string;

        /* in the case of policyQualifiers/qualifier, the type has to be FILE_ASN1_TYPE_IA5_STRING.
           FILE_ASN1_TYPE_PRINTABLE_STRING will cause OpenSSL's X.509 parser to spit out random
           characters.
         */
        $filters['policyQualifiers']['qualifier']
            = array('type' => FILE_ASN1_TYPE_IA5_STRING);

        $asn1->loadFilters($filters);

        $this->_mapOutExtensions($cert, 'tbsCertificate/extensions', $asn1);
        $this->_mapOutDNs($cert, 'tbsCertificate/issuer/rdnSequence', $asn1);
        $this->_mapOutDNs($cert, 'tbsCertificate/subject/rdnSequence', $asn1);

        $cert = $asn1->encodeDER($cert, $this->Certificate);

        switch ($format) {
            case FILE_X509_FORMAT_DER:
                return $cert;
            // case FILE_X509_FORMAT_PEM:
            default:
                return "-----BEGIN CERTIFICATE-----\r\n" . chunk_split(base64_encode($cert), 64) . '-----END CERTIFICATE-----';
        }
    }

    /**
     * Map extension values from octet string to extension-specific internal
     *   format.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapInExtensions(&$root, $path, $asn1)
    {
        $extensions = &$this->_subArrayUnchecked($root, $path);

        if ($extensions) {
            for ($i = 0; $i < count($extensions); $i++) {
                $id = $extensions[$i]['extnId'];
                $value = &$extensions[$i]['extnValue'];
                $value = base64_decode($value);
                $decoded = $asn1->decodeBER($value);
                /* [extnValue] contains the DER encoding of an ASN.1 value
                   corresponding to the extension type identified by extnID */
                $map = $this->_getMapping($id);
                if (!is_bool($map)) {
                    $decoder = $id == 'id-ce-nameConstraints' ?
                        array($this, '_decodeNameConstraintIP') :
                        array($this, '_decodeIP');
                    $mapped = $asn1->asn1map($decoded[0], $map, array('iPAddress' => $decoder));
                    $value = $mapped === false ? $decoded[0] : $mapped;

                    if ($id == 'id-ce-certificatePolicies') {
                        for ($j = 0; $j < count($value); $j++) {
                            if (!isset($value[$j]['policyQualifiers'])) {
                                continue;
                            }
                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
                                $map = $this->_getMapping($subid);
                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
                                if ($map !== false) {
                                    $decoded = $asn1->decodeBER($subvalue);
                                    $mapped = $asn1->asn1map($decoded[0], $map);
                                    $subvalue = $mapped === false ? $decoded[0] : $mapped;
                                }
                            }
                        }
                    }
                } else {
                    $value = base64_encode($value);
                }
            }
        }
    }

    /**
     * Map extension values from extension-specific internal format to
     *   octet string.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapOutExtensions(&$root, $path, $asn1)
    {
        $extensions = &$this->_subArray($root, $path);

        if (is_array($extensions)) {
            $size = count($extensions);
            for ($i = 0; $i < $size; $i++) {
                if (is_object($extensions[$i]) && strtolower(get_class($extensions[$i])) == 'file_asn1_element') {
                    continue;
                }

                $id = $extensions[$i]['extnId'];
                $value = &$extensions[$i]['extnValue'];

                switch ($id) {
                    case 'id-ce-certificatePolicies':
                        for ($j = 0; $j < count($value); $j++) {
                            if (!isset($value[$j]['policyQualifiers'])) {
                                continue;
                            }
                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
                                $map = $this->_getMapping($subid);
                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
                                if ($map !== false) {
                                    // by default File_ASN1 will try to render qualifier as a FILE_ASN1_TYPE_IA5_STRING since it's
                                    // actual type is FILE_ASN1_TYPE_ANY
                                    $subvalue = new File_ASN1_Element($asn1->encodeDER($subvalue, $map));
                                }
                            }
                        }
                        break;
                    case 'id-ce-authorityKeyIdentifier': // use 00 as the serial number instead of an empty string
                        if (isset($value['authorityCertSerialNumber'])) {
                            if ($value['authorityCertSerialNumber']->toBytes() == '') {
                                $temp = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 2) . "\1\0";
                                $value['authorityCertSerialNumber'] = new File_ASN1_Element($temp);
                            }
                        }
                }

                /* [extnValue] contains the DER encoding of an ASN.1 value
                   corresponding to the extension type identified by extnID */
                $map = $this->_getMapping($id);
                if (is_bool($map)) {
                    if (!$map) {
                        user_error($id . ' is not a currently supported extension');
                        unset($extensions[$i]);
                    }
                } else {
                    $temp = $asn1->encodeDER($value, $map, array('iPAddress' => array($this, '_encodeIP')));
                    $value = base64_encode($temp);
                }
            }
        }
    }

    /**
     * Map attribute values from ANY type to attribute-specific internal
     *   format.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapInAttributes(&$root, $path, $asn1)
    {
        $attributes = &$this->_subArray($root, $path);

        if (is_array($attributes)) {
            for ($i = 0; $i < count($attributes); $i++) {
                $id = $attributes[$i]['type'];
                /* $value contains the DER encoding of an ASN.1 value
                   corresponding to the attribute type identified by type */
                $map = $this->_getMapping($id);
                if (is_array($attributes[$i]['value'])) {
                    $values = &$attributes[$i]['value'];
                    for ($j = 0; $j < count($values); $j++) {
                        $value = $asn1->encodeDER($values[$j], $this->AttributeValue);
                        $decoded = $asn1->decodeBER($value);
                        if (!is_bool($map)) {
                            $mapped = $asn1->asn1map($decoded[0], $map);
                            if ($mapped !== false) {
                                $values[$j] = $mapped;
                            }
                            if ($id == 'pkcs-9-at-extensionRequest' && $this->_isSubArrayValid($values, $j)) {
                                $this->_mapInExtensions($values, $j, $asn1);
                            }
                        } elseif ($map) {
                            $values[$j] = base64_encode($value);
                        }
                    }
                }
            }
        }
    }

    /**
     * Map attribute values from attribute-specific internal format to
     *   ANY type.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapOutAttributes(&$root, $path, $asn1)
    {
        $attributes = &$this->_subArray($root, $path);

        if (is_array($attributes)) {
            $size = count($attributes);
            for ($i = 0; $i < $size; $i++) {
                /* [value] contains the DER encoding of an ASN.1 value
                   corresponding to the attribute type identified by type */
                $id = $attributes[$i]['type'];
                $map = $this->_getMapping($id);
                if ($map === false) {
                    user_error($id . ' is not a currently supported attribute', E_USER_NOTICE);
                    unset($attributes[$i]);
                } elseif (is_array($attributes[$i]['value'])) {
                    $values = &$attributes[$i]['value'];
                    for ($j = 0; $j < count($values); $j++) {
                        switch ($id) {
                            case 'pkcs-9-at-extensionRequest':
                                $this->_mapOutExtensions($values, $j, $asn1);
                                break;
                        }

                        if (!is_bool($map)) {
                            $temp = $asn1->encodeDER($values[$j], $map);
                            $decoded = $asn1->decodeBER($temp);
                            $values[$j] = $asn1->asn1map($decoded[0], $this->AttributeValue);
                        }
                    }
                }
            }
        }
    }

    /**
     * Map DN values from ANY type to DN-specific internal
     *   format.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapInDNs(&$root, $path, $asn1)
    {
        $dns = &$this->_subArray($root, $path);

        if (is_array($dns)) {
            for ($i = 0; $i < count($dns); $i++) {
                for ($j = 0; $j < count($dns[$i]); $j++) {
                    $type = $dns[$i][$j]['type'];
                    $value = &$dns[$i][$j]['value'];
                    if (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
                        $map = $this->_getMapping($type);
                        if (!is_bool($map)) {
                            $decoded = $asn1->decodeBER($value);
                            $value = $asn1->asn1map($decoded[0], $map);
                        }
                    }
                }
            }
        }
    }

    /**
     * Map DN values from DN-specific internal format to
     *   ANY type.
     *
     * @param array ref $root
     * @param string $path
     * @param object $asn1
     * @access private
     */
    function _mapOutDNs(&$root, $path, $asn1)
    {
        $dns = &$this->_subArray($root, $path);

        if (is_array($dns)) {
            $size = count($dns);
            for ($i = 0; $i < $size; $i++) {
                for ($j = 0; $j < count($dns[$i]); $j++) {
                    $type = $dns[$i][$j]['type'];
                    $value = &$dns[$i][$j]['value'];
                    if (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
                        continue;
                    }

                    $map = $this->_getMapping($type);
                    if (!is_bool($map)) {
                        $value = new File_ASN1_Element($asn1->encodeDER($value, $map));
                    }
                }
            }
        }
    }

    /**
     * Associate an extension ID to an extension mapping
     *
     * @param string $extnId
     * @access private
     * @return mixed
     */
    function _getMapping($extnId)
    {
        if (!is_string($extnId)) { // eg. if it's a File_ASN1_Element object
            return true;
        }

        switch ($extnId) {
            case 'id-ce-keyUsage':
                return $this->KeyUsage;
            case 'id-ce-basicConstraints':
                return $this->BasicConstraints;
            case 'id-ce-subjectKeyIdentifier':
                return $this->KeyIdentifier;
            case 'id-ce-cRLDistributionPoints':
                return $this->CRLDistributionPoints;
            case 'id-ce-authorityKeyIdentifier':
                return $this->AuthorityKeyIdentifier;
            case 'id-ce-certificatePolicies':
                return $this->CertificatePolicies;
            case 'id-ce-extKeyUsage':
                return $this->ExtKeyUsageSyntax;
            case 'id-pe-authorityInfoAccess':
                return $this->AuthorityInfoAccessSyntax;
            case 'id-pe-subjectInfoAccess':
                return $this->SubjectInfoAccessSyntax;
            case 'id-ce-subjectAltName':
                return $this->SubjectAltName;
            case 'id-ce-subjectDirectoryAttributes':
                return $this->SubjectDirectoryAttributes;
            case 'id-ce-privateKeyUsagePeriod':
                return $this->PrivateKeyUsagePeriod;
            case 'id-ce-issuerAltName':
                return $this->IssuerAltName;
            case 'id-ce-policyMappings':
                return $this->PolicyMappings;
            case 'id-ce-nameConstraints':
                return $this->NameConstraints;

            case 'netscape-cert-type':
                return $this->netscape_cert_type;
            case 'netscape-comment':
                return $this->netscape_comment;
            case 'netscape-ca-policy-url':
                return $this->netscape_ca_policy_url;

            // since id-qt-cps isn't a constructed type it will have already been decoded as a string by the time it gets
            // back around to asn1map() and we don't want it decoded again.
            //case 'id-qt-cps':
            //    return $this->CPSuri;
            case 'id-qt-unotice':
                return $this->UserNotice;

            // the following OIDs are unsupported but we don't want them to give notices when calling saveX509().
            case 'id-pe-logotype': // http://www.ietf.org/rfc/rfc3709.txt
            case 'entrustVersInfo':
            // http://support.microsoft.com/kb/287547
            case '1.3.6.1.4.1.311.20.2': // szOID_ENROLL_CERTTYPE_EXTENSION
            case '1.3.6.1.4.1.311.21.1': // szOID_CERTSRV_CA_VERSION
            // "SET Secure Electronic Transaction Specification"
            // http://www.maithean.com/docs/set_bk3.pdf
            case '2.23.42.7.0': // id-set-hashedRootKey
            // "Certificate Transparency"
            // https://tools.ietf.org/html/rfc6962
            case '1.3.6.1.4.1.11129.2.4.2':
            // "Qualified Certificate statements"
            // https://tools.ietf.org/html/rfc3739#section-3.2.6
            case '1.3.6.1.5.5.7.1.3':
                return true;

            // CSR attributes
            case 'pkcs-9-at-unstructuredName':
                return $this->PKCS9String;
            case 'pkcs-9-at-challengePassword':
                return $this->DirectoryString;
            case 'pkcs-9-at-extensionRequest':
                return $this->Extensions;

            // CRL extensions.
            case 'id-ce-cRLNumber':
                return $this->CRLNumber;
            case 'id-ce-deltaCRLIndicator':
                return $this->CRLNumber;
            case 'id-ce-issuingDistributionPoint':
                return $this->IssuingDistributionPoint;
            case 'id-ce-freshestCRL':
                return $this->CRLDistributionPoints;
            case 'id-ce-cRLReasons':
                return $this->CRLReason;
            case 'id-ce-invalidityDate':
                return $this->InvalidityDate;
            case 'id-ce-certificateIssuer':
                return $this->CertificateIssuer;
            case 'id-ce-holdInstructionCode':
                return $this->HoldInstructionCode;
            case 'id-at-postalAddress':
                return $this->PostalAddress;
        }

        return false;
    }

    /**
     * Load an X.509 certificate as a certificate authority
     *
     * @param string $cert
     * @access public
     * @return bool
     */
    function loadCA($cert)
    {
        $olddn = $this->dn;
        $oldcert = $this->currentCert;
        $oldsigsubj = $this->signatureSubject;
        $oldkeyid = $this->currentKeyIdentifier;

        $cert = $this->loadX509($cert);
        if (!$cert) {
            $this->dn = $olddn;
            $this->currentCert = $oldcert;
            $this->signatureSubject = $oldsigsubj;
            $this->currentKeyIdentifier = $oldkeyid;

            return false;
        }

        /* From RFC5280 "PKIX Certificate and CRL Profile":

           If the keyUsage extension is present, then the subject public key
           MUST NOT be used to verify signatures on certificates or CRLs unless
           the corresponding keyCertSign or cRLSign bit is set. */
        //$keyUsage = $this->getExtension('id-ce-keyUsage');
        //if ($keyUsage && !in_array('keyCertSign', $keyUsage)) {
        //    return false;
        //}

        /* From RFC5280 "PKIX Certificate and CRL Profile":

           The cA boolean indicates whether the certified public key may be used
           to verify certificate signatures.  If the cA boolean is not asserted,
           then the keyCertSign bit in the key usage extension MUST NOT be
           asserted.  If the basic constraints extension is not present in a
           version 3 certificate, or the extension is present but the cA boolean
           is not asserted, then the certified public key MUST NOT be used to
           verify certificate signatures. */
        //$basicConstraints = $this->getExtension('id-ce-basicConstraints');
        //if (!$basicConstraints || !$basicConstraints['cA']) {
        //    return false;
        //}

        $this->CAs[] = $cert;

        $this->dn = $olddn;
        $this->currentCert = $oldcert;
        $this->signatureSubject = $oldsigsubj;

        return true;
    }

    /**
     * Validate an X.509 certificate against a URL
     *
     * From RFC2818 "HTTP over TLS":
     *
     * Matching is performed using the matching rules specified by
     * [RFC2459].  If more than one identity of a given type is present in
     * the certificate (e.g., more than one dNSName name, a match in any one
     * of the set is considered acceptable.) Names may contain the wildcard
     * character * which is considered to match any single domain name
     * component or component fragment. E.g., *.a.com matches foo.a.com but
     * not bar.foo.a.com. f*.com matches foo.com but not bar.com.
     *
     * @param string $url
     * @access public
     * @return bool
     */
    function validateURL($url)
    {
        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
            return false;
        }

        $components = parse_url($url);
        if (!isset($components['host'])) {
            return false;
        }

        if ($names = $this->getExtension('id-ce-subjectAltName')) {
            foreach ($names as $name) {
                foreach ($name as $key => $value) {
                    $value = str_replace(array('.', '*'), array('\.', '[^.]*'), $value);
                    switch ($key) {
                        case 'dNSName':
                            /* From RFC2818 "HTTP over TLS":

                               If a subjectAltName extension of type dNSName is present, that MUST
                               be used as the identity. Otherwise, the (most specific) Common Name
                               field in the Subject field of the certificate MUST be used. Although
                               the use of the Common Name is existing practice, it is deprecated and
                               Certification Authorities are encouraged to use the dNSName instead. */
                            if (preg_match('#^' . $value . '$#', $components['host'])) {
                                return true;
                            }
                            break;
                        case 'iPAddress':
                            /* From RFC2818 "HTTP over TLS":

                               In some cases, the URI is specified as an IP address rather than a
                               hostname. In this case, the iPAddress subjectAltName must be present
                               in the certificate and must exactly match the IP in the URI. */
                            if (preg_match('#(?:\d{1-3}\.){4}#', $components['host'] . '.') && preg_match('#^' . $value . '$#', $components['host'])) {
                                return true;
                            }
                    }
                }
            }
            return false;
        }

        if ($value = $this->getDNProp('id-at-commonName')) {
            $value = str_replace(array('.', '*'), array('\.', '[^.]*'), $value[0]);
            return preg_match('#^' . $value . '$#', $components['host']);
        }

        return false;
    }

    /**
     * Validate a date
     *
     * If $date isn't defined it is assumed to be the current date.
     *
     * @param \DateTime|int|string $date optional
     * @access public
     */
    function validateDate($date = null)
    {
        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
            return false;
        }

        if (!isset($date)) {
            $date = class_exists('DateTime') ?
                new DateTime(null, new DateTimeZone(@date_default_timezone_get())) :
                time();
        }

        $notBefore = $this->currentCert['tbsCertificate']['validity']['notBefore'];
        $notBefore = isset($notBefore['generalTime']) ? $notBefore['generalTime'] : $notBefore['utcTime'];

        $notAfter = $this->currentCert['tbsCertificate']['validity']['notAfter'];
        $notAfter = isset($notAfter['generalTime']) ? $notAfter['generalTime'] : $notAfter['utcTime'];

        switch (true) {
            case is_string($date) && class_exists('DateTime'):
                $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
            case is_object($date) && strtolower(get_class($date)) == 'datetime':
                $notBefore = new DateTime($notBefore, new DateTimeZone(@date_default_timezone_get()));
                $notAfter = new DateTime($notAfter, new DateTimeZone(@date_default_timezone_get()));
                break;
            case is_string($date):
                $date = @strtotime($date);
            default:
                $notBefore = @strtotime($notBefore);
                $notAfter = @strtotime($notAfter);
        }

        switch (true) {
            case $date < $notBefore:
            case $date > $notAfter:
                return false;
        }

        return true;
    }

    /**
     * Fetches a URL
     *
     * @param string $url
     * @access private
     * @return bool|string
     */
    function _fetchURL($url)
    {
        if ($this->disable_url_fetch) {
            return false;
        }

        $parts = parse_url($url);
        $data = '';
        switch ($parts['scheme']) {
            case 'http':
                $fsock = @fsockopen($parts['host'], isset($parts['port']) ? $parts['port'] : 80);
                if (!$fsock) {
                    return false;
                }
                fputs($fsock, "GET $parts[path] HTTP/1.0\r\n");
                fputs($fsock, "Host: $parts[host]\r\n\r\n");
                $line = fgets($fsock, 1024);
                if (strlen($line) < 3) {
                    return false;
                }
                preg_match('#HTTP/1.\d (\d{3})#', $line, $temp);
                if ($temp[1] != '200') {
                    return false;
                }

                // skip the rest of the headers in the http response
                while (!feof($fsock) && fgets($fsock, 1024) != "\r\n") {
                }

                while (!feof($fsock)) {
                    $data.= fread($fsock, 1024);
                }

                break;
            //case 'ftp':
            //case 'ldap':
            //default:
        }

        return $data;
    }

    /**
     * Validates an intermediate cert as identified via authority info access extension
     *
     * See https://tools.ietf.org/html/rfc4325 for more info
     *
     * @param bool $caonly
     * @param int $count
     * @access private
     * @return bool
     */
    function _testForIntermediate($caonly, $count)
    {
        $opts = $this->getExtension('id-pe-authorityInfoAccess');
        if (!is_array($opts)) {
            return false;
        }
        foreach ($opts as $opt) {
            if ($opt['accessMethod'] == 'id-ad-caIssuers') {
                // accessLocation is a GeneralName. GeneralName fields support stuff like email addresses, IP addresses, LDAP,
                // etc, but we're only supporting URI's. URI's and LDAP are the only thing https://tools.ietf.org/html/rfc4325
                // discusses
                if (isset($opt['accessLocation']['uniformResourceIdentifier'])) {
                    $url = $opt['accessLocation']['uniformResourceIdentifier'];
                    break;
                }
            }
        }

        if (!isset($url)) {
            return false;
        }

        $cert = $this->_fetchURL($url);
        if (!is_string($cert)) {
            return false;
        }

        $parent = new static();
        $parent->CAs = $this->CAs;
        /*
         "Conforming applications that support HTTP or FTP for accessing
          certificates MUST be able to accept .cer files and SHOULD be able
          to accept .p7c files." -- https://tools.ietf.org/html/rfc4325

         A .p7c file is 'a "certs-only" CMS message as specified in RFC 2797"

         These are currently unsupported
        */
        if (!is_array($parent->loadX509($cert))) {
            return false;
        }

        if (!$parent->_validateSignatureCountable($caonly, ++$count)) {
            return false;
        }

        $this->CAs[] = $parent->currentCert;
        //$this->loadCA($cert);

        return true;
    }

    /**
     * Validate a signature
     *
     * Works on X.509 certs, CSR's and CRL's.
     * Returns true if the signature is verified, false if it is not correct or null on error
     *
     * By default returns false for self-signed certs. Call validateSignature(false) to make this support
     * self-signed.
     *
     * The behavior of this function is inspired by {@link http://php.net/openssl-verify openssl_verify}.
     *
     * @param bool $caonly optional
     * @access public
     * @return mixed
     */
    function validateSignature($caonly = true)
    {
        return $this->_validateSignatureCountable($caonly, 0);
    }

    /**
     * Validate a signature
     *
     * Performs said validation whilst keeping track of how many times validation method is called
     *
     * @param bool $caonly
     * @param int $count
     * @access private
     * @return mixed
     */
    function _validateSignatureCountable($caonly, $count)
    {
        if (!is_array($this->currentCert) || !isset($this->signatureSubject)) {
            return null;
        }

        if ($count == $this->recur_limit) {
            return false;
        }

        /* TODO:
           "emailAddress attribute values are not case-sensitive (e.g., "subscriber@example.com" is the same as "SUBSCRIBER@EXAMPLE.COM")."
            -- http://tools.ietf.org/html/rfc5280#section-4.1.2.6

           implement pathLenConstraint in the id-ce-basicConstraints extension */

        switch (true) {
            case isset($this->currentCert['tbsCertificate']):
                // self-signed cert
                switch (true) {
                    case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $this->currentCert['tbsCertificate']['subject']:
                    case defined('FILE_X509_IGNORE_TYPE') && $this->getIssuerDN(FILE_X509_DN_STRING) === $this->getDN(FILE_X509_DN_STRING):
                        $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
                        $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier');
                        switch (true) {
                            case !is_array($authorityKey):
                            case !$subjectKeyID:
                            case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
                                $signingCert = $this->currentCert; // working cert
                        }
                }

                if (!empty($this->CAs)) {
                    for ($i = 0; $i < count($this->CAs); $i++) {
                        // even if the cert is a self-signed one we still want to see if it's a CA;
                        // if not, we'll conditionally return an error
                        $ca = $this->CAs[$i];
                        switch (true) {
                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']:
                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(FILE_X509_DN_STRING, $this->currentCert['tbsCertificate']['issuer']) === $this->getDN(FILE_X509_DN_STRING, $ca['tbsCertificate']['subject']):
                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
                                switch (true) {
                                    case !is_array($authorityKey):
                                    case !$subjectKeyID:
                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
                                            break 2; // serial mismatch - check other ca
                                        }
                                        $signingCert = $ca; // working cert
                                        break 3;
                                }
                        }
                    }
                    if (count($this->CAs) == $i && $caonly) {
                        return $this->_testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
                    }
                } elseif (!isset($signingCert) || $caonly) {
                    return $this->_testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
                }
                return $this->_validateSignature(
                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
                    $this->currentCert['signatureAlgorithm']['algorithm'],
                    substr(base64_decode($this->currentCert['signature']), 1),
                    $this->signatureSubject
                );
            case isset($this->currentCert['certificationRequestInfo']):
                return $this->_validateSignature(
                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['algorithm']['algorithm'],
                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'],
                    $this->currentCert['signatureAlgorithm']['algorithm'],
                    substr(base64_decode($this->currentCert['signature']), 1),
                    $this->signatureSubject
                );
            case isset($this->currentCert['publicKeyAndChallenge']):
                return $this->_validateSignature(
                    $this->currentCert['publicKeyAndChallenge']['spki']['algorithm']['algorithm'],
                    $this->currentCert['publicKeyAndChallenge']['spki']['subjectPublicKey'],
                    $this->currentCert['signatureAlgorithm']['algorithm'],
                    substr(base64_decode($this->currentCert['signature']), 1),
                    $this->signatureSubject
                );
            case isset($this->currentCert['tbsCertList']):
                if (!empty($this->CAs)) {
                    for ($i = 0; $i < count($this->CAs); $i++) {
                        $ca = $this->CAs[$i];
                        switch (true) {
                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertList']['issuer'] === $ca['tbsCertificate']['subject']:
                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(FILE_X509_DN_STRING, $this->currentCert['tbsCertList']['issuer']) === $this->getDN(FILE_X509_DN_STRING, $ca['tbsCertificate']['subject']):
                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
                                switch (true) {
                                    case !is_array($authorityKey):
                                    case !$subjectKeyID:
                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
                                            break 2; // serial mismatch - check other ca
                                        }
                                        $signingCert = $ca; // working cert
                                        break 3;
                                }
                        }
                    }
                }
                if (!isset($signingCert)) {
                    return false;
                }
                return $this->_validateSignature(
                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
                    $this->currentCert['signatureAlgorithm']['algorithm'],
                    substr(base64_decode($this->currentCert['signature']), 1),
                    $this->signatureSubject
                );
            default:
                return false;
        }
    }

    /**
     * Validates a signature
     *
     * Returns true if the signature is verified, false if it is not correct or null on error
     *
     * @param string $publicKeyAlgorithm
     * @param string $publicKey
     * @param string $signatureAlgorithm
     * @param string $signature
     * @param string $signatureSubject
     * @access private
     * @return int
     */
    function _validateSignature($publicKeyAlgorithm, $publicKey, $signatureAlgorithm, $signature, $signatureSubject)
    {
        switch ($publicKeyAlgorithm) {
            case 'rsaEncryption':
                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }
                $rsa = new Crypt_RSA();
                $rsa->loadKey($publicKey);

                switch ($signatureAlgorithm) {
                    case 'md2WithRSAEncryption':
                    case 'md5WithRSAEncryption':
                    case 'sha1WithRSAEncryption':
                    case 'sha224WithRSAEncryption':
                    case 'sha256WithRSAEncryption':
                    case 'sha384WithRSAEncryption':
                    case 'sha512WithRSAEncryption':
                        $rsa->setHash(preg_replace('#WithRSAEncryption$#', '', $signatureAlgorithm));
                        $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
                        if (!@$rsa->verify($signatureSubject, $signature)) {
                            return false;
                        }
                        break;
                    default:
                        return null;
                }
                break;
            default:
                return null;
        }

        return true;
    }

    /**
     * Sets the recursion limit
     *
     * When validating a signature it may be necessary to download intermediate certs from URI's.
     * An intermediate cert that linked to itself would result in an infinite loop so to prevent
     * that we set a recursion limit. A negative number means that there is no recursion limit.
     *
     * @param int $count
     * @access public
     */
    function setRecurLimit($count)
    {
        $this->recur_limit = $count;
    }

    /**
     * Prevents URIs from being automatically retrieved
     *
     * @access public
     */
    function disableURLFetch()
    {
        $this->disable_url_fetch = true;
    }

    /**
     * Allows URIs to be automatically retrieved
     *
     * @access public
     */
    function enableURLFetch()
    {
        $this->disable_url_fetch = false;
    }

    /**
     * Reformat public keys
     *
     * Reformats a public key to a format supported by phpseclib (if applicable)
     *
     * @param string $algorithm
     * @param string $key
     * @access private
     * @return string
     */
    function _reformatKey($algorithm, $key)
    {
        switch ($algorithm) {
            case 'rsaEncryption':
                return
                    "-----BEGIN RSA PUBLIC KEY-----\r\n" .
                    // subjectPublicKey is stored as a bit string in X.509 certs.  the first byte of a bit string represents how many bits
                    // in the last byte should be ignored.  the following only supports non-zero stuff but as none of the X.509 certs Firefox
                    // uses as a cert authority actually use a non-zero bit I think it's safe to assume that none do.
                    chunk_split(base64_encode(substr(base64_decode($key), 1)), 64) .
                    '-----END RSA PUBLIC KEY-----';
            default:
                return $key;
        }
    }

    /**
     * Decodes an IP address
     *
     * Takes in a base64 encoded "blob" and returns a human readable IP address
     *
     * @param string $ip
     * @access private
     * @return string
     */
    function _decodeIP($ip)
    {
        $ip = base64_decode($ip);
        list(, $ip) = unpack('N', $ip);
        return long2ip($ip);
    }

    /**
     * Decodes an IP address in a name constraints extension
     *
     * Takes in a base64 encoded "blob" and returns a human readable IP address / mask
     *
     * @param string $ip
     * @access private
     * @return array
     */
    function _decodeNameConstraintIP($ip)
    {
        $ip = base64_decode($ip);
        list(, $ip, $mask) = unpack('N2', $ip);
        return [long2ip($ip), long2ip($mask)];
    }

    /**
     * Encodes an IP address
     *
     * Takes a human readable IP address into a base64-encoded "blob"
     *
     * @param string|array $ip
     * @access private
     * @return string
     */
    function _encodeIP($ip)
    {
        return is_string($ip) ?
            base64_encode(pack('N', ip2long($ip))) :
            base64_encode(pack('NN', ip2long($ip[0]), ip2long($ip[1])));
    }

    /**
     * "Normalizes" a Distinguished Name property
     *
     * @param string $propName
     * @access private
     * @return mixed
     */
    function _translateDNProp($propName)
    {
        switch (strtolower($propName)) {
            case 'id-at-countryname':
            case 'countryname':
            case 'c':
                return 'id-at-countryName';
            case 'id-at-organizationname':
            case 'organizationname':
            case 'o':
                return 'id-at-organizationName';
            case 'id-at-dnqualifier':
            case 'dnqualifier':
                return 'id-at-dnQualifier';
            case 'id-at-commonname':
            case 'commonname':
            case 'cn':
                return 'id-at-commonName';
            case 'id-at-stateorprovincename':
            case 'stateorprovincename':
            case 'state':
            case 'province':
            case 'provincename':
            case 'st':
                return 'id-at-stateOrProvinceName';
            case 'id-at-localityname':
            case 'localityname':
            case 'l':
                return 'id-at-localityName';
            case 'id-emailaddress':
            case 'emailaddress':
                return 'pkcs-9-at-emailAddress';
            case 'id-at-serialnumber':
            case 'serialnumber':
                return 'id-at-serialNumber';
            case 'id-at-postalcode':
            case 'postalcode':
                return 'id-at-postalCode';
            case 'id-at-streetaddress':
            case 'streetaddress':
                return 'id-at-streetAddress';
            case 'id-at-name':
            case 'name':
                return 'id-at-name';
            case 'id-at-givenname':
            case 'givenname':
                return 'id-at-givenName';
            case 'id-at-surname':
            case 'surname':
            case 'sn':
                return 'id-at-surname';
            case 'id-at-initials':
            case 'initials':
                return 'id-at-initials';
            case 'id-at-generationqualifier':
            case 'generationqualifier':
                return 'id-at-generationQualifier';
            case 'id-at-organizationalunitname':
            case 'organizationalunitname':
            case 'ou':
                return 'id-at-organizationalUnitName';
            case 'id-at-pseudonym':
            case 'pseudonym':
                return 'id-at-pseudonym';
            case 'id-at-title':
            case 'title':
                return 'id-at-title';
            case 'id-at-description':
            case 'description':
                return 'id-at-description';
            case 'id-at-role':
            case 'role':
                return 'id-at-role';
            case 'id-at-uniqueidentifier':
            case 'uniqueidentifier':
            case 'x500uniqueidentifier':
                return 'id-at-uniqueIdentifier';
            case 'postaladdress':
            case 'id-at-postaladdress':
                return 'id-at-postalAddress';
            default:
                return false;
        }
    }

    /**
     * Set a Distinguished Name property
     *
     * @param string $propName
     * @param mixed $propValue
     * @param string $type optional
     * @access public
     * @return bool
     */
    function setDNProp($propName, $propValue, $type = 'utf8String')
    {
        if (empty($this->dn)) {
            $this->dn = array('rdnSequence' => array());
        }

        if (($propName = $this->_translateDNProp($propName)) === false) {
            return false;
        }

        foreach ((array) $propValue as $v) {
            if (!is_array($v) && isset($type)) {
                $v = array($type => $v);
            }
            $this->dn['rdnSequence'][] = array(
                array(
                    'type' => $propName,
                    'value'=> $v
                )
            );
        }

        return true;
    }

    /**
     * Remove Distinguished Name properties
     *
     * @param string $propName
     * @access public
     */
    function removeDNProp($propName)
    {
        if (empty($this->dn)) {
            return;
        }

        if (($propName = $this->_translateDNProp($propName)) === false) {
            return;
        }

        $dn = &$this->dn['rdnSequence'];
        $size = count($dn);
        for ($i = 0; $i < $size; $i++) {
            if ($dn[$i][0]['type'] == $propName) {
                unset($dn[$i]);
            }
        }

        $dn = array_values($dn);
        // fix for https://bugs.php.net/75433 affecting PHP 7.2
        if (!isset($dn[0])) {
            $dn = array_splice($dn, 0, 0);
        }
    }

    /**
     * Get Distinguished Name properties
     *
     * @param string $propName
     * @param array $dn optional
     * @param bool $withType optional
     * @return mixed
     * @access public
     */
    function getDNProp($propName, $dn = null, $withType = false)
    {
        if (!isset($dn)) {
            $dn = $this->dn;
        }

        if (empty($dn)) {
            return false;
        }

        if (($propName = $this->_translateDNProp($propName)) === false) {
            return false;
        }

        $asn1 = new File_ASN1();
        $asn1->loadOIDs($this->oids);
        $filters = array();
        $filters['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
        $asn1->loadFilters($filters);
        $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
        $dn = $dn['rdnSequence'];
        $result = array();
        for ($i = 0; $i < count($dn); $i++) {
            if ($dn[$i][0]['type'] == $propName) {
                $v = $dn[$i][0]['value'];
                if (!$withType) {
                    if (is_array($v)) {
                        foreach ($v as $type => $s) {
                            $type = array_search($type, $asn1->ANYmap, true);
                            if ($type !== false && isset($asn1->stringTypeSize[$type])) {
                                $s = $asn1->convert($s, $type);
                                if ($s !== false) {
                                    $v = $s;
                                    break;
                                }
                            }
                        }
                        if (is_array($v)) {
                            $v = array_pop($v); // Always strip data type.
                        }
                    } elseif (is_object($v) && strtolower(get_class($v)) == 'file_asn1_element') {
                        $map = $this->_getMapping($propName);
                        if (!is_bool($map)) {
                            $decoded = $asn1->decodeBER($v);
                            $v = $asn1->asn1map($decoded[0], $map);
                        }
                    }
                }
                $result[] = $v;
            }
        }

        return $result;
    }

    /**
     * Set a Distinguished Name
     *
     * @param mixed $dn
     * @param bool $merge optional
     * @param string $type optional
     * @access public
     * @return bool
     */
    function setDN($dn, $merge = false, $type = 'utf8String')
    {
        if (!$merge) {
            $this->dn = null;
        }

        if (is_array($dn)) {
            if (isset($dn['rdnSequence'])) {
                $this->dn = $dn; // No merge here.
                return true;
            }

            // handles stuff generated by openssl_x509_parse()
            foreach ($dn as $prop => $value) {
                if (!$this->setDNProp($prop, $value, $type)) {
                    return false;
                }
            }
            return true;
        }

        // handles everything else
        $results = preg_split('#((?:^|, *|/)(?:C=|O=|OU=|CN=|L=|ST=|SN=|postalCode=|streetAddress=|emailAddress=|serialNumber=|organizationalUnitName=|title=|description=|role=|x500UniqueIdentifier=|postalAddress=))#', $dn, -1, PREG_SPLIT_DELIM_CAPTURE);
        for ($i = 1; $i < count($results); $i+=2) {
            $prop = trim($results[$i], ', =/');
            $value = $results[$i + 1];
            if (!$this->setDNProp($prop, $value, $type)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Get the Distinguished Name for a certificates subject
     *
     * @param mixed $format optional
     * @param array $dn optional
     * @access public
     * @return bool
     */
    function getDN($format = FILE_X509_DN_ARRAY, $dn = null)
    {
        if (!isset($dn)) {
            $dn = isset($this->currentCert['tbsCertList']) ? $this->currentCert['tbsCertList']['issuer'] : $this->dn;
        }

        switch ((int) $format) {
            case FILE_X509_DN_ARRAY:
                return $dn;
            case FILE_X509_DN_ASN1:
                $asn1 = new File_ASN1();
                $asn1->loadOIDs($this->oids);
                $filters = array();
                $filters['rdnSequence']['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
                $asn1->loadFilters($filters);
                $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
                return $asn1->encodeDER($dn, $this->Name);
            case FILE_X509_DN_CANON:
                //  No SEQUENCE around RDNs and all string values normalized as
                // trimmed lowercase UTF-8 with all spacing as one blank.
                // constructed RDNs will not be canonicalized
                $asn1 = new File_ASN1();
                $asn1->loadOIDs($this->oids);
                $filters = array();
                $filters['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
                $asn1->loadFilters($filters);
                $result = '';
                $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
                foreach ($dn['rdnSequence'] as $rdn) {
                    foreach ($rdn as $i => $attr) {
                        $attr = &$rdn[$i];
                        if (is_array($attr['value'])) {
                            foreach ($attr['value'] as $type => $v) {
                                $type = array_search($type, $asn1->ANYmap, true);
                                if ($type !== false && isset($asn1->stringTypeSize[$type])) {
                                    $v = $asn1->convert($v, $type);
                                    if ($v !== false) {
                                        $v = preg_replace('/\s+/', ' ', $v);
                                        $attr['value'] = strtolower(trim($v));
                                        break;
                                    }
                                }
                            }
                        }
                    }
                    $result .= $asn1->encodeDER($rdn, $this->RelativeDistinguishedName);
                }
                return $result;
            case FILE_X509_DN_HASH:
                $dn = $this->getDN(FILE_X509_DN_CANON, $dn);
                if (!class_exists('Crypt_Hash')) {
                    include_once 'Crypt/Hash.php';
                }
                $hash = new Crypt_Hash('sha1');
                $hash = $hash->hash($dn);
                extract(unpack('Vhash', $hash));
                return strtolower(bin2hex(pack('N', $hash)));
        }

        // Default is to return a string.
        $start = true;
        $output = '';
        $result = array();
        $asn1 = new File_ASN1();
        $asn1->loadOIDs($this->oids);
        $filters = array();
        $filters['rdnSequence']['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
        $asn1->loadFilters($filters);
        $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
        foreach ($dn['rdnSequence'] as $field) {
            $prop = $field[0]['type'];
            $value = $field[0]['value'];

            $delim = ', ';
            switch ($prop) {
                case 'id-at-countryName':
                    $desc = 'C';
                    break;
                case 'id-at-stateOrProvinceName':
                    $desc = 'ST';
                    break;
                case 'id-at-organizationName':
                    $desc = 'O';
                    break;
                case 'id-at-organizationalUnitName':
                    $desc = 'OU';
                    break;
                case 'id-at-commonName':
                    $desc = 'CN';
                    break;
                case 'id-at-localityName':
                    $desc = 'L';
                    break;
                case 'id-at-surname':
                    $desc = 'SN';
                    break;
                case 'id-at-uniqueIdentifier':
                    $delim = '/';
                    $desc = 'x500UniqueIdentifier';
                    break;
                case 'id-at-postalAddress':
                    $delim = '/';
                    $desc = 'postalAddress';
                    break;
                default:
                    $delim = '/';
                    $desc = preg_replace('#.+-([^-]+)$#', '$1', $prop);
            }

            if (!$start) {
                $output.= $delim;
            }
            if (is_array($value)) {
                foreach ($value as $type => $v) {
                    $type = array_search($type, $asn1->ANYmap, true);
                    if ($type !== false && isset($asn1->stringTypeSize[$type])) {
                        $v = $asn1->convert($v, $type);
                        if ($v !== false) {
                            $value = $v;
                            break;
                        }
                    }
                }
                if (is_array($value)) {
                    $value = array_pop($value); // Always strip data type.
                }
            } elseif (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
                // @codingStandardsIgnoreStart
                $callback = version_compare(PHP_VERSION, '5.3.0') >= 0 ?
                    function ($x) { return "\x" . bin2hex($x[0]); } :
                    create_function('$x', 'return "\x" . bin2hex($x[0]);');
                // @codingStandardsIgnoreEnd
                $value = strtoupper(preg_replace_callback('#[^\x20-\x7E]#', $callback, $value->element));
            }
            $output.= $desc . '=' . $value;
            $result[$desc] = isset($result[$desc]) ?
                array_merge((array) $result[$desc], array($value)) :
                $value;
            $start = false;
        }

        return $format == FILE_X509_DN_OPENSSL ? $result : $output;
    }

    /**
     * Get the Distinguished Name for a certificate/crl issuer
     *
     * @param int $format optional
     * @access public
     * @return mixed
     */
    function getIssuerDN($format = FILE_X509_DN_ARRAY)
    {
        switch (true) {
            case !isset($this->currentCert) || !is_array($this->currentCert):
                break;
            case isset($this->currentCert['tbsCertificate']):
                return $this->getDN($format, $this->currentCert['tbsCertificate']['issuer']);
            case isset($this->currentCert['tbsCertList']):
                return $this->getDN($format, $this->currentCert['tbsCertList']['issuer']);
        }

        return false;
    }

    /**
     * Get the Distinguished Name for a certificate/csr subject
     * Alias of getDN()
     *
     * @param int $format optional
     * @access public
     * @return mixed
     */
    function getSubjectDN($format = FILE_X509_DN_ARRAY)
    {
        switch (true) {
            case !empty($this->dn):
                return $this->getDN($format);
            case !isset($this->currentCert) || !is_array($this->currentCert):
                break;
            case isset($this->currentCert['tbsCertificate']):
                return $this->getDN($format, $this->currentCert['tbsCertificate']['subject']);
            case isset($this->currentCert['certificationRequestInfo']):
                return $this->getDN($format, $this->currentCert['certificationRequestInfo']['subject']);
        }

        return false;
    }

    /**
     * Get an individual Distinguished Name property for a certificate/crl issuer
     *
     * @param string $propName
     * @param bool $withType optional
     * @access public
     * @return mixed
     */
    function getIssuerDNProp($propName, $withType = false)
    {
        switch (true) {
            case !isset($this->currentCert) || !is_array($this->currentCert):
                break;
            case isset($this->currentCert['tbsCertificate']):
                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['issuer'], $withType);
            case isset($this->currentCert['tbsCertList']):
                return $this->getDNProp($propName, $this->currentCert['tbsCertList']['issuer'], $withType);
        }

        return false;
    }

    /**
     * Get an individual Distinguished Name property for a certificate/csr subject
     *
     * @param string $propName
     * @param bool $withType optional
     * @access public
     * @return mixed
     */
    function getSubjectDNProp($propName, $withType = false)
    {
        switch (true) {
            case !empty($this->dn):
                return $this->getDNProp($propName, null, $withType);
            case !isset($this->currentCert) || !is_array($this->currentCert):
                break;
            case isset($this->currentCert['tbsCertificate']):
                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['subject'], $withType);
            case isset($this->currentCert['certificationRequestInfo']):
                return $this->getDNProp($propName, $this->currentCert['certificationRequestInfo']['subject'], $withType);
        }

        return false;
    }

    /**
     * Get the certificate chain for the current cert
     *
     * @access public
     * @return mixed
     */
    function getChain()
    {
        $chain = array($this->currentCert);

        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
            return false;
        }
        if (empty($this->CAs)) {
            return $chain;
        }
        while (true) {
            $currentCert = $chain[count($chain) - 1];
            for ($i = 0; $i < count($this->CAs); $i++) {
                $ca = $this->CAs[$i];
                if ($currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']) {
                    $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier', $currentCert);
                    $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
                    switch (true) {
                        case !is_array($authorityKey):
                        case is_array($authorityKey) && isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
                            if ($currentCert === $ca) {
                                break 3;
                            }
                            $chain[] = $ca;
                            break 2;
                    }
                }
            }
            if ($i == count($this->CAs)) {
                break;
            }
        }
        foreach ($chain as $key => $value) {
            $chain[$key] = new File_X509();
            $chain[$key]->loadX509($value);
        }
        return $chain;
    }

    /**
     * Set public key
     *
     * Key needs to be a Crypt_RSA object
     *
     * @param object $key
     * @access public
     * @return bool
     */
    function setPublicKey($key)
    {
        $key->setPublicKey();
        $this->publicKey = $key;
    }

    /**
     * Set private key
     *
     * Key needs to be a Crypt_RSA object
     *
     * @param object $key
     * @access public
     */
    function setPrivateKey($key)
    {
        $this->privateKey = $key;
    }

    /**
     * Set challenge
     *
     * Used for SPKAC CSR's
     *
     * @param string $challenge
     * @access public
     */
    function setChallenge($challenge)
    {
        $this->challenge = $challenge;
    }

    /**
     * Gets the public key
     *
     * Returns a Crypt_RSA object or a false.
     *
     * @access public
     * @return mixed
     */
    function getPublicKey()
    {
        if (isset($this->publicKey)) {
            return $this->publicKey;
        }

        if (isset($this->currentCert) && is_array($this->currentCert)) {
            foreach (array('tbsCertificate/subjectPublicKeyInfo', 'certificationRequestInfo/subjectPKInfo') as $path) {
                $keyinfo = $this->_subArray($this->currentCert, $path);
                if (!empty($keyinfo)) {
                    break;
                }
            }
        }
        if (empty($keyinfo)) {
            return false;
        }

        $key = $keyinfo['subjectPublicKey'];

        switch ($keyinfo['algorithm']['algorithm']) {
            case 'rsaEncryption':
                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }
                $publicKey = new Crypt_RSA();
                $publicKey->loadKey($key);
                $publicKey->setPublicKey();
                break;
            default:
                return false;
        }

        return $publicKey;
    }

    /**
     * Load a Certificate Signing Request
     *
     * @param string $csr
     * @access public
     * @return mixed
     */
    function loadCSR($csr, $mode = FILE_X509_FORMAT_AUTO_DETECT)
    {
        if (is_array($csr) && isset($csr['certificationRequestInfo'])) {
            unset($this->currentCert);
            unset($this->currentKeyIdentifier);
            unset($this->signatureSubject);
            $this->dn = $csr['certificationRequestInfo']['subject'];
            if (!isset($this->dn)) {
                return false;
            }

            $this->currentCert = $csr;
            return $csr;
        }

        // see http://tools.ietf.org/html/rfc2986

        $asn1 = new File_ASN1();

        if ($mode != FILE_X509_FORMAT_DER) {
            $newcsr = $this->_extractBER($csr);
            if ($mode == FILE_X509_FORMAT_PEM && $csr == $newcsr) {
                return false;
            }
            $csr = $newcsr;
        }
        $orig = $csr;

        if ($csr === false) {
            $this->currentCert = false;
            return false;
        }

        $asn1->loadOIDs($this->oids);
        $decoded = $asn1->decodeBER($csr);

        if (empty($decoded)) {
            $this->currentCert = false;
            return false;
        }

        $csr = $asn1->asn1map($decoded[0], $this->CertificationRequest);
        if (!isset($csr) || $csr === false) {
            $this->currentCert = false;
            return false;
        }

        $this->_mapInAttributes($csr, 'certificationRequestInfo/attributes', $asn1);
        $this->_mapInDNs($csr, 'certificationRequestInfo/subject/rdnSequence', $asn1);

        $this->dn = $csr['certificationRequestInfo']['subject'];

        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);

        $algorithm = &$csr['certificationRequestInfo']['subjectPKInfo']['algorithm']['algorithm'];
        $key = &$csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'];
        $key = $this->_reformatKey($algorithm, $key);

        switch ($algorithm) {
            case 'rsaEncryption':
                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }
                $this->publicKey = new Crypt_RSA();
                $this->publicKey->loadKey($key);
                $this->publicKey->setPublicKey();
                break;
            default:
                $this->publicKey = null;
        }

        $this->currentKeyIdentifier = null;
        $this->currentCert = $csr;

        return $csr;
    }

    /**
     * Save CSR request
     *
     * @param array $csr
     * @param int $format optional
     * @access public
     * @return string
     */
    function saveCSR($csr, $format = FILE_X509_FORMAT_PEM)
    {
        if (!is_array($csr) || !isset($csr['certificationRequestInfo'])) {
            return false;
        }

        switch (true) {
            case !($algorithm = $this->_subArray($csr, 'certificationRequestInfo/subjectPKInfo/algorithm/algorithm')):
            case is_object($csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
                break;
            default:
                switch ($algorithm) {
                    case 'rsaEncryption':
                        $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']
                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'])));
                        $csr['certificationRequestInfo']['subjectPKInfo']['algorithm']['parameters'] = null;
                        $csr['signatureAlgorithm']['parameters'] = null;
                        $csr['certificationRequestInfo']['signature']['parameters'] = null;
                }
        }

        $asn1 = new File_ASN1();

        $asn1->loadOIDs($this->oids);

        $filters = array();
        $filters['certificationRequestInfo']['subject']['rdnSequence']['value']
            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);

        $asn1->loadFilters($filters);

        $this->_mapOutDNs($csr, 'certificationRequestInfo/subject/rdnSequence', $asn1);
        $this->_mapOutAttributes($csr, 'certificationRequestInfo/attributes', $asn1);
        $csr = $asn1->encodeDER($csr, $this->CertificationRequest);

        switch ($format) {
            case FILE_X509_FORMAT_DER:
                return $csr;
            // case FILE_X509_FORMAT_PEM:
            default:
                return "-----BEGIN CERTIFICATE REQUEST-----\r\n" . chunk_split(base64_encode($csr), 64) . '-----END CERTIFICATE REQUEST-----';
        }
    }

    /**
     * Load a SPKAC CSR
     *
     * SPKAC's are produced by the HTML5 keygen element:
     *
     * https://developer.mozilla.org/en-US/docs/HTML/Element/keygen
     *
     * @param string $csr
     * @access public
     * @return mixed
     */
    function loadSPKAC($spkac)
    {
        if (is_array($spkac) && isset($spkac['publicKeyAndChallenge'])) {
            unset($this->currentCert);
            unset($this->currentKeyIdentifier);
            unset($this->signatureSubject);
            $this->currentCert = $spkac;
            return $spkac;
        }

        // see http://www.w3.org/html/wg/drafts/html/master/forms.html#signedpublickeyandchallenge

        $asn1 = new File_ASN1();

        // OpenSSL produces SPKAC's that are preceded by the string SPKAC=
        $temp = preg_replace('#(?:SPKAC=)|[ \r\n\\\]#', '', $spkac);
        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
        if ($temp != false) {
            $spkac = $temp;
        }
        $orig = $spkac;

        if ($spkac === false) {
            $this->currentCert = false;
            return false;
        }

        $asn1->loadOIDs($this->oids);
        $decoded = $asn1->decodeBER($spkac);

        if (empty($decoded)) {
            $this->currentCert = false;
            return false;
        }

        $spkac = $asn1->asn1map($decoded[0], $this->SignedPublicKeyAndChallenge);

        if (!isset($spkac) || $spkac === false) {
            $this->currentCert = false;
            return false;
        }

        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);

        $algorithm = &$spkac['publicKeyAndChallenge']['spki']['algorithm']['algorithm'];
        $key = &$spkac['publicKeyAndChallenge']['spki']['subjectPublicKey'];
        $key = $this->_reformatKey($algorithm, $key);

        switch ($algorithm) {
            case 'rsaEncryption':
                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }
                $this->publicKey = new Crypt_RSA();
                $this->publicKey->loadKey($key);
                $this->publicKey->setPublicKey();
                break;
            default:
                $this->publicKey = null;
        }

        $this->currentKeyIdentifier = null;
        $this->currentCert = $spkac;

        return $spkac;
    }

    /**
     * Save a SPKAC CSR request
     *
     * @param array $csr
     * @param int $format optional
     * @access public
     * @return string
     */
    function saveSPKAC($spkac, $format = FILE_X509_FORMAT_PEM)
    {
        if (!is_array($spkac) || !isset($spkac['publicKeyAndChallenge'])) {
            return false;
        }

        $algorithm = $this->_subArray($spkac, 'publicKeyAndChallenge/spki/algorithm/algorithm');
        switch (true) {
            case !$algorithm:
            case is_object($spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']):
                break;
            default:
                switch ($algorithm) {
                    case 'rsaEncryption':
                        $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']
                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey'])));
                }
        }

        $asn1 = new File_ASN1();

        $asn1->loadOIDs($this->oids);
        $spkac = $asn1->encodeDER($spkac, $this->SignedPublicKeyAndChallenge);

        switch ($format) {
            case FILE_X509_FORMAT_DER:
                return $spkac;
            // case FILE_X509_FORMAT_PEM:
            default:
                // OpenSSL's implementation of SPKAC requires the SPKAC be preceded by SPKAC= and since there are pretty much
                // no other SPKAC decoders phpseclib will use that same format
                return 'SPKAC=' . base64_encode($spkac);
        }
    }

    /**
     * Load a Certificate Revocation List
     *
     * @param string $crl
     * @access public
     * @return mixed
     */
    function loadCRL($crl, $mode = FILE_X509_FORMAT_AUTO_DETECT)
    {
        if (is_array($crl) && isset($crl['tbsCertList'])) {
            $this->currentCert = $crl;
            unset($this->signatureSubject);
            return $crl;
        }

        $asn1 = new File_ASN1();

        if ($mode != FILE_X509_FORMAT_DER) {
            $newcrl = $this->_extractBER($crl);
            if ($mode == FILE_X509_FORMAT_PEM && $crl == $newcrl) {
                return false;
            }
            $crl = $newcrl;
        }
        $orig = $crl;

        if ($crl === false) {
            $this->currentCert = false;
            return false;
        }

        $asn1->loadOIDs($this->oids);
        $decoded = $asn1->decodeBER($crl);

        if (empty($decoded)) {
            $this->currentCert = false;
            return false;
        }

        $crl = $asn1->asn1map($decoded[0], $this->CertificateList);
        if (!isset($crl) || $crl === false) {
            $this->currentCert = false;
            return false;
        }

        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);

        $this->_mapInDNs($crl, 'tbsCertList/issuer/rdnSequence', $asn1);
        if ($this->_isSubArrayValid($crl, 'tbsCertList/crlExtensions')) {
            $this->_mapInExtensions($crl, 'tbsCertList/crlExtensions', $asn1);
        }
        if ($this->_isSubArrayValid($crl, 'tbsCertList/revokedCertificates')) {
            $rclist_ref = &$this->_subArrayUnchecked($crl, 'tbsCertList/revokedCertificates');
            if ($rclist_ref) {
                $rclist = $crl['tbsCertList']['revokedCertificates'];
                foreach ($rclist as $i => $extension) {
                    if ($this->_isSubArrayValid($rclist, "$i/crlEntryExtensions", $asn1)) {
                        $this->_mapInExtensions($rclist_ref, "$i/crlEntryExtensions", $asn1);
                    }
                }
            }
        }

        $this->currentKeyIdentifier = null;
        $this->currentCert = $crl;

        return $crl;
    }

    /**
     * Save Certificate Revocation List.
     *
     * @param array $crl
     * @param int $format optional
     * @access public
     * @return string
     */
    function saveCRL($crl, $format = FILE_X509_FORMAT_PEM)
    {
        if (!is_array($crl) || !isset($crl['tbsCertList'])) {
            return false;
        }

        $asn1 = new File_ASN1();

        $asn1->loadOIDs($this->oids);

        $filters = array();
        $filters['tbsCertList']['issuer']['rdnSequence']['value']
            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
        $filters['tbsCertList']['signature']['parameters']
            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
        $filters['signatureAlgorithm']['parameters']
            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);

        if (empty($crl['tbsCertList']['signature']['parameters'])) {
            $filters['tbsCertList']['signature']['parameters']
                = array('type' => FILE_ASN1_TYPE_NULL);
        }

        if (empty($crl['signatureAlgorithm']['parameters'])) {
            $filters['signatureAlgorithm']['parameters']
                = array('type' => FILE_ASN1_TYPE_NULL);
        }

        $asn1->loadFilters($filters);

        $this->_mapOutDNs($crl, 'tbsCertList/issuer/rdnSequence', $asn1);
        $this->_mapOutExtensions($crl, 'tbsCertList/crlExtensions', $asn1);
        $rclist = &$this->_subArray($crl, 'tbsCertList/revokedCertificates');
        if (is_array($rclist)) {
            foreach ($rclist as $i => $extension) {
                $this->_mapOutExtensions($rclist, "$i/crlEntryExtensions", $asn1);
            }
        }

        $crl = $asn1->encodeDER($crl, $this->CertificateList);

        switch ($format) {
            case FILE_X509_FORMAT_DER:
                return $crl;
            // case FILE_X509_FORMAT_PEM:
            default:
                return "-----BEGIN X509 CRL-----\r\n" . chunk_split(base64_encode($crl), 64) . '-----END X509 CRL-----';
        }
    }

    /**
     * Helper function to build a time field according to RFC 3280 section
     *  - 4.1.2.5 Validity
     *  - 5.1.2.4 This Update
     *  - 5.1.2.5 Next Update
     *  - 5.1.2.6 Revoked Certificates
     * by choosing utcTime iff year of date given is before 2050 and generalTime else.
     *
     * @param string $date in format date('D, d M Y H:i:s O')
     * @access private
     * @return array
     */
    function _timeField($date)
    {
        if (is_object($date) && strtolower(get_class($date)) == 'file_asn1_element') {
            return $date;
        }
        if (!class_exists('DateTime')) {
            $year = @gmdate("Y", @strtotime($date)); // the same way ASN1.php parses this
        } else {
            $dateObj = new DateTime($date, new DateTimeZone('GMT'));
            $year = $dateObj->format('Y');
        }
        if ($year < 2050) {
            return array('utcTime' => $date);
        } else {
            return array('generalTime' => $date);
        }
    }

    /**
     * Sign an X.509 certificate
     *
     * $issuer's private key needs to be loaded.
     * $subject can be either an existing X.509 cert (if you want to resign it),
     * a CSR or something with the DN and public key explicitly set.
     *
     * @param File_X509 $issuer
     * @param File_X509 $subject
     * @param string $signatureAlgorithm optional
     * @access public
     * @return mixed
     */
    function sign($issuer, $subject, $signatureAlgorithm = 'sha1WithRSAEncryption')
    {
        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
            return false;
        }

        if (isset($subject->publicKey) && !($subjectPublicKey = $subject->_formatSubjectPublicKey())) {
            return false;
        }

        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;

        if (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertificate'])) {
            $this->currentCert = $subject->currentCert;
            $this->currentCert['tbsCertificate']['signature']['algorithm'] = $signatureAlgorithm;
            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;

            if (!empty($this->startDate)) {
                $this->currentCert['tbsCertificate']['validity']['notBefore'] = $this->_timeField($this->startDate);
            }
            if (!empty($this->endDate)) {
                $this->currentCert['tbsCertificate']['validity']['notAfter'] = $this->_timeField($this->endDate);
            }
            if (!empty($this->serialNumber)) {
                $this->currentCert['tbsCertificate']['serialNumber'] = $this->serialNumber;
            }
            if (!empty($subject->dn)) {
                $this->currentCert['tbsCertificate']['subject'] = $subject->dn;
            }
            if (!empty($subject->publicKey)) {
                $this->currentCert['tbsCertificate']['subjectPublicKeyInfo'] = $subjectPublicKey;
            }
            $this->removeExtension('id-ce-authorityKeyIdentifier');
            if (isset($subject->domains)) {
                $this->removeExtension('id-ce-subjectAltName');
            }
        } elseif (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertList'])) {
            return false;
        } else {
            if (!isset($subject->publicKey)) {
                return false;
            }

            if (!class_exists('DateTime')) {
                $startDate = !empty($this->startDate) ? $this->startDate : @date('D, d M Y H:i:s O');
                $endDate = !empty($this->endDate) ? $this->endDate : @date('D, d M Y H:i:s O', strtotime('+1 year'));
            } else {
                $startDate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
                $startDate = !empty($this->startDate) ? $this->startDate : $startDate->format('D, d M Y H:i:s O');

                $endDate = new DateTime('+1 year', new DateTimeZone(@date_default_timezone_get()));
                $endDate = !empty($this->endDate) ? $this->endDate : $endDate->format('D, d M Y H:i:s O');
            }
            if (!empty($this->serialNumber)) {
                $serialNumber = $this->serialNumber;
            } else {
                if (!function_exists('crypt_random_string')) {
                    include_once 'Crypt/Random.php';
                }
                /* "The serial number MUST be a positive integer"
                   "Conforming CAs MUST NOT use serialNumber values longer than 20 octets."
                    -- https://tools.ietf.org/html/rfc5280#section-4.1.2.2

                   for the integer to be positive the leading bit needs to be 0 hence the
                   application of a bitmap
                */
                $serialNumber = new Math_BigInteger(crypt_random_string(20) & ("\x7F" . str_repeat("\xFF", 19)), 256);
            }

            $this->currentCert = array(
                'tbsCertificate' =>
                    array(
                        'version' => 'v3',
                        'serialNumber' => $serialNumber, // $this->setSerialNumber()
                        'signature' => array('algorithm' => $signatureAlgorithm),
                        'issuer' => false, // this is going to be overwritten later
                        'validity' => array(
                            'notBefore' => $this->_timeField($startDate), // $this->setStartDate()
                            'notAfter' => $this->_timeField($endDate)   // $this->setEndDate()
                        ),
                        'subject' => $subject->dn,
                        'subjectPublicKeyInfo' => $subjectPublicKey
                    ),
                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
                    'signature'          => false // this is going to be overwritten later
            );

            // Copy extensions from CSR.
            $csrexts = $subject->getAttribute('pkcs-9-at-extensionRequest', 0);

            if (!empty($csrexts)) {
                $this->currentCert['tbsCertificate']['extensions'] = $csrexts;
            }
        }

        $this->currentCert['tbsCertificate']['issuer'] = $issuer->dn;

        if (isset($issuer->currentKeyIdentifier)) {
            $this->setExtension('id-ce-authorityKeyIdentifier', array(
                    //'authorityCertIssuer' => array(
                    //    array(
                    //        'directoryName' => $issuer->dn
                    //    )
                    //),
                    'keyIdentifier' => $issuer->currentKeyIdentifier
                ));
            //$extensions = &$this->currentCert['tbsCertificate']['extensions'];
            //if (isset($issuer->serialNumber)) {
            //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
            //}
            //unset($extensions);
        }

        if (isset($subject->currentKeyIdentifier)) {
            $this->setExtension('id-ce-subjectKeyIdentifier', $subject->currentKeyIdentifier);
        }

        $altName = array();

        if (isset($subject->domains) && count($subject->domains)) {
            $altName = array_map(array('File_X509', '_dnsName'), $subject->domains);
        }

        if (isset($subject->ipAddresses) && count($subject->ipAddresses)) {
            // should an IP address appear as the CN if no domain name is specified? idk
            //$ips = count($subject->domains) ? $subject->ipAddresses : array_slice($subject->ipAddresses, 1);
            $ipAddresses = array();
            foreach ($subject->ipAddresses as $ipAddress) {
                $encoded = $subject->_ipAddress($ipAddress);
                if ($encoded !== false) {
                    $ipAddresses[] = $encoded;
                }
            }
            if (count($ipAddresses)) {
                $altName = array_merge($altName, $ipAddresses);
            }
        }

        if (!empty($altName)) {
            $this->setExtension('id-ce-subjectAltName', $altName);
        }

        if ($this->caFlag) {
            $keyUsage = $this->getExtension('id-ce-keyUsage');
            if (!$keyUsage) {
                $keyUsage = array();
            }

            $this->setExtension(
                'id-ce-keyUsage',
                array_values(array_unique(array_merge($keyUsage, array('cRLSign', 'keyCertSign'))))
            );

            $basicConstraints = $this->getExtension('id-ce-basicConstraints');
            if (!$basicConstraints) {
                $basicConstraints = array();
            }

            $this->setExtension(
                'id-ce-basicConstraints',
                array_unique(array_merge(array('cA' => true), $basicConstraints)),
                true
            );

            if (!isset($subject->currentKeyIdentifier)) {
                $this->setExtension('id-ce-subjectKeyIdentifier', base64_encode($this->computeKeyIdentifier($this->currentCert)), false, false);
            }
        }

        // resync $this->signatureSubject
        // save $tbsCertificate in case there are any File_ASN1_Element objects in it
        $tbsCertificate = $this->currentCert['tbsCertificate'];
        $this->loadX509($this->saveX509($this->currentCert));

        $result = $this->_sign($issuer->privateKey, $signatureAlgorithm);
        $result['tbsCertificate'] = $tbsCertificate;

        $this->currentCert = $currentCert;
        $this->signatureSubject = $signatureSubject;

        return $result;
    }

    /**
     * Sign a CSR
     *
     * @access public
     * @return mixed
     */
    function signCSR($signatureAlgorithm = 'sha1WithRSAEncryption')
    {
        if (!is_object($this->privateKey) || empty($this->dn)) {
            return false;
        }

        $origPublicKey = $this->publicKey;
        $class = get_class($this->privateKey);
        $this->publicKey = new $class();
        $this->publicKey->loadKey($this->privateKey->getPublicKey());
        $this->publicKey->setPublicKey();
        if (!($publicKey = $this->_formatSubjectPublicKey())) {
            return false;
        }
        $this->publicKey = $origPublicKey;

        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;

        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['certificationRequestInfo'])) {
            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
            if (!empty($this->dn)) {
                $this->currentCert['certificationRequestInfo']['subject'] = $this->dn;
            }
            $this->currentCert['certificationRequestInfo']['subjectPKInfo'] = $publicKey;
        } else {
            $this->currentCert = array(
                'certificationRequestInfo' =>
                    array(
                        'version' => 'v1',
                        'subject' => $this->dn,
                        'subjectPKInfo' => $publicKey
                    ),
                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
                    'signature'          => false // this is going to be overwritten later
            );
        }

        // resync $this->signatureSubject
        // save $certificationRequestInfo in case there are any File_ASN1_Element objects in it
        $certificationRequestInfo = $this->currentCert['certificationRequestInfo'];
        $this->loadCSR($this->saveCSR($this->currentCert));

        $result = $this->_sign($this->privateKey, $signatureAlgorithm);
        $result['certificationRequestInfo'] = $certificationRequestInfo;

        $this->currentCert = $currentCert;
        $this->signatureSubject = $signatureSubject;

        return $result;
    }

    /**
     * Sign a SPKAC
     *
     * @access public
     * @return mixed
     */
    function signSPKAC($signatureAlgorithm = 'sha1WithRSAEncryption')
    {
        if (!is_object($this->privateKey)) {
            return false;
        }

        $origPublicKey = $this->publicKey;
        $class = get_class($this->privateKey);
        $this->publicKey = new $class();
        $this->publicKey->loadKey($this->privateKey->getPublicKey());
        $this->publicKey->setPublicKey();
        $publicKey = $this->_formatSubjectPublicKey();
        if (!$publicKey) {
            return false;
        }
        $this->publicKey = $origPublicKey;

        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;

        // re-signing a SPKAC seems silly but since everything else supports re-signing why not?
        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['publicKeyAndChallenge'])) {
            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
            $this->currentCert['publicKeyAndChallenge']['spki'] = $publicKey;
            if (!empty($this->challenge)) {
                // the bitwise AND ensures that the output is a valid IA5String
                $this->currentCert['publicKeyAndChallenge']['challenge'] = $this->challenge & str_repeat("\x7F", strlen($this->challenge));
            }
        } else {
            $this->currentCert = array(
                'publicKeyAndChallenge' =>
                    array(
                        'spki' => $publicKey,
                        // quoting ,
                        // "A challenge string that is submitted along with the public key. Defaults to an empty string if not specified."
                        // both Firefox and OpenSSL ("openssl spkac -key private.key") behave this way
                        // we could alternatively do this instead if we ignored the specs:
                        // crypt_random_string(8) & str_repeat("\x7F", 8)
                        'challenge' => !empty($this->challenge) ? $this->challenge : ''
                    ),
                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
                    'signature'          => false // this is going to be overwritten later
            );
        }

        // resync $this->signatureSubject
        // save $publicKeyAndChallenge in case there are any File_ASN1_Element objects in it
        $publicKeyAndChallenge = $this->currentCert['publicKeyAndChallenge'];
        $this->loadSPKAC($this->saveSPKAC($this->currentCert));

        $result = $this->_sign($this->privateKey, $signatureAlgorithm);
        $result['publicKeyAndChallenge'] = $publicKeyAndChallenge;

        $this->currentCert = $currentCert;
        $this->signatureSubject = $signatureSubject;

        return $result;
    }

    /**
     * Sign a CRL
     *
     * $issuer's private key needs to be loaded.
     *
     * @param File_X509 $issuer
     * @param File_X509 $crl
     * @param string $signatureAlgorithm optional
     * @access public
     * @return mixed
     */
    function signCRL($issuer, $crl, $signatureAlgorithm = 'sha1WithRSAEncryption')
    {
        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
            return false;
        }

        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
        if (!class_exists('DateTime')) {
            $thisUpdate = !empty($this->startDate) ? $this->startDate : @date('D, d M Y H:i:s O');
        } else {
            $thisUpdate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
            $thisUpdate = !empty($this->startDate) ? $this->startDate : $thisUpdate->format('D, d M Y H:i:s O');
        }

        if (isset($crl->currentCert) && is_array($crl->currentCert) && isset($crl->currentCert['tbsCertList'])) {
            $this->currentCert = $crl->currentCert;
            $this->currentCert['tbsCertList']['signature']['algorithm'] = $signatureAlgorithm;
            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
        } else {
            $this->currentCert = array(
                'tbsCertList' =>
                    array(
                        'version' => 'v2',
                        'signature' => array('algorithm' => $signatureAlgorithm),
                        'issuer' => false, // this is going to be overwritten later
                        'thisUpdate' => $this->_timeField($thisUpdate) // $this->setStartDate()
                    ),
                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
                    'signature'          => false // this is going to be overwritten later
            );
        }

        $tbsCertList = &$this->currentCert['tbsCertList'];
        $tbsCertList['issuer'] = $issuer->dn;
        $tbsCertList['thisUpdate'] = $this->_timeField($thisUpdate);

        if (!empty($this->endDate)) {
            $tbsCertList['nextUpdate'] = $this->_timeField($this->endDate); // $this->setEndDate()
        } else {
            unset($tbsCertList['nextUpdate']);
        }

        if (!empty($this->serialNumber)) {
            $crlNumber = $this->serialNumber;
        } else {
            $crlNumber = $this->getExtension('id-ce-cRLNumber');
            // "The CRL number is a non-critical CRL extension that conveys a
            //  monotonically increasing sequence number for a given CRL scope and
            //  CRL issuer.  This extension allows users to easily determine when a
            //  particular CRL supersedes another CRL."
            // -- https://tools.ietf.org/html/rfc5280#section-5.2.3
            $crlNumber = $crlNumber !== false ? $crlNumber->add(new Math_BigInteger(1)) : null;
        }

        $this->removeExtension('id-ce-authorityKeyIdentifier');
        $this->removeExtension('id-ce-issuerAltName');

        // Be sure version >= v2 if some extension found.
        $version = isset($tbsCertList['version']) ? $tbsCertList['version'] : 0;
        if (!$version) {
            if (!empty($tbsCertList['crlExtensions'])) {
                $version = 1; // v2.
            } elseif (!empty($tbsCertList['revokedCertificates'])) {
                foreach ($tbsCertList['revokedCertificates'] as $cert) {
                    if (!empty($cert['crlEntryExtensions'])) {
                        $version = 1; // v2.
                    }
                }
            }

            if ($version) {
                $tbsCertList['version'] = $version;
            }
        }

        // Store additional extensions.
        if (!empty($tbsCertList['version'])) { // At least v2.
            if (!empty($crlNumber)) {
                $this->setExtension('id-ce-cRLNumber', $crlNumber);
            }

            if (isset($issuer->currentKeyIdentifier)) {
                $this->setExtension('id-ce-authorityKeyIdentifier', array(
                        //'authorityCertIssuer' => array(
                        //    array(
                        //        'directoryName' => $issuer->dn
                        //    )
                        //),
                        'keyIdentifier' => $issuer->currentKeyIdentifier
                    ));
                //$extensions = &$tbsCertList['crlExtensions'];
                //if (isset($issuer->serialNumber)) {
                //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
                //}
                //unset($extensions);
            }

            $issuerAltName = $this->getExtension('id-ce-subjectAltName', $issuer->currentCert);

            if ($issuerAltName !== false) {
                $this->setExtension('id-ce-issuerAltName', $issuerAltName);
            }
        }

        if (empty($tbsCertList['revokedCertificates'])) {
            unset($tbsCertList['revokedCertificates']);
        }

        unset($tbsCertList);

        // resync $this->signatureSubject
        // save $tbsCertList in case there are any File_ASN1_Element objects in it
        $tbsCertList = $this->currentCert['tbsCertList'];
        $this->loadCRL($this->saveCRL($this->currentCert));

        $result = $this->_sign($issuer->privateKey, $signatureAlgorithm);
        $result['tbsCertList'] = $tbsCertList;

        $this->currentCert = $currentCert;
        $this->signatureSubject = $signatureSubject;

        return $result;
    }

    /**
     * X.509 certificate signing helper function.
     *
     * @param object $key
     * @param File_X509 $subject
     * @param string $signatureAlgorithm
     * @access public
     * @return mixed
     */
    function _sign($key, $signatureAlgorithm)
    {
        switch (strtolower(get_class($key))) {
            case 'crypt_rsa':
                switch ($signatureAlgorithm) {
                    case 'md2WithRSAEncryption':
                    case 'md5WithRSAEncryption':
                    case 'sha1WithRSAEncryption':
                    case 'sha224WithRSAEncryption':
                    case 'sha256WithRSAEncryption':
                    case 'sha384WithRSAEncryption':
                    case 'sha512WithRSAEncryption':
                        $key->setHash(preg_replace('#WithRSAEncryption$#', '', $signatureAlgorithm));
                        $key->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);

                        $this->currentCert['signature'] = base64_encode("\0" . $key->sign($this->signatureSubject));
                        return $this->currentCert;
                }
            default:
                return false;
        }
    }

    /**
     * Set certificate start date
     *
     * @param string $date
     * @access public
     */
    function setStartDate($date)
    {
        if (class_exists('DateTime')) {
            $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
            $this->startDate = $date->format('D, d M Y H:i:s O');
        } else {
            $this->startDate = @date('D, d M Y H:i:s O', @strtotime($date));
        }
    }

    /**
     * Set certificate end date
     *
     * @param string $date
     * @access public
     */
    function setEndDate($date)
    {
        /*
          To indicate that a certificate has no well-defined expiration date,
          the notAfter SHOULD be assigned the GeneralizedTime value of
          99991231235959Z.

          -- http://tools.ietf.org/html/rfc5280#section-4.1.2.5
        */
        if (strtolower($date) == 'lifetime') {
            $temp = '99991231235959Z';
            $asn1 = new File_ASN1();
            $temp = chr(FILE_ASN1_TYPE_GENERALIZED_TIME) . $asn1->_encodeLength(strlen($temp)) . $temp;
            $this->endDate = new File_ASN1_Element($temp);
        } else {
            if (class_exists('DateTime')) {
                $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
                $this->endDate = $date->format('D, d M Y H:i:s O');
            } else {
                $this->endDate = @date('D, d M Y H:i:s O', @strtotime($date));
            }
        }
    }

    /**
     * Set Serial Number
     *
     * @param string $serial
     * @param $base optional
     * @access public
     */
    function setSerialNumber($serial, $base = -256)
    {
        $this->serialNumber = new Math_BigInteger($serial, $base);
    }

    /**
     * Turns the certificate into a certificate authority
     *
     * @access public
     */
    function makeCA()
    {
        $this->caFlag = true;
    }

    /**
     * Check for validity of subarray
     *
     * This is intended for use in conjunction with _subArrayUnchecked(),
     * implementing the checks included in _subArray() but without copying
     * a potentially large array by passing its reference by-value to is_array().
     *
     * @param array $root
     * @param string $path
     * @return boolean
     * @access private
     */
    function _isSubArrayValid($root, $path)
    {
        if (!is_array($root)) {
            return false;
        }

        foreach (explode('/', $path) as $i) {
            if (!is_array($root)) {
                return false;
            }

            if (!isset($root[$i])) {
                return true;
            }

            $root = $root[$i];
        }

        return true;
    }

    /**
     * Get a reference to a subarray
     *
     * This variant of _subArray() does no is_array() checking,
     * so $root should be checked with _isSubArrayValid() first.
     *
     * This is here for performance reasons:
     * Passing a reference (i.e. $root) by-value (i.e. to is_array())
     * creates a copy. If $root is an especially large array, this is expensive.
     *
     * @param array $root
     * @param string $path  absolute path with / as component separator
     * @param bool $create optional
     * @access private
     * @return array|false
     */
    function &_subArrayUnchecked(&$root, $path, $create = false)
    {
        $false = false;

        foreach (explode('/', $path) as $i) {
            if (!isset($root[$i])) {
                if (!$create) {
                    return $false;
                }

                $root[$i] = array();
            }

            $root = &$root[$i];
        }

        return $root;
    }

    /**
     * Get a reference to a subarray
     *
     * @param array $root
     * @param string $path  absolute path with / as component separator
     * @param bool $create optional
     * @access private
     * @return array|false
     */
    function &_subArray(&$root, $path, $create = false)
    {
        $false = false;

        if (!is_array($root)) {
            return $false;
        }

        foreach (explode('/', $path) as $i) {
            if (!is_array($root)) {
                return $false;
            }

            if (!isset($root[$i])) {
                if (!$create) {
                    return $false;
                }

                $root[$i] = array();
            }

            $root = &$root[$i];
        }

        return $root;
    }

    /**
     * Get a reference to an extension subarray
     *
     * @param array $root
     * @param string $path optional absolute path with / as component separator
     * @param bool $create optional
     * @access private
     * @return array|false
     */
    function &_extensions(&$root, $path = null, $create = false)
    {
        if (!isset($root)) {
            $root = $this->currentCert;
        }

        switch (true) {
            case !empty($path):
            case !is_array($root):
                break;
            case isset($root['tbsCertificate']):
                $path = 'tbsCertificate/extensions';
                break;
            case isset($root['tbsCertList']):
                $path = 'tbsCertList/crlExtensions';
                break;
            case isset($root['certificationRequestInfo']):
                $pth = 'certificationRequestInfo/attributes';
                $attributes = &$this->_subArray($root, $pth, $create);

                if (is_array($attributes)) {
                    foreach ($attributes as $key => $value) {
                        if ($value['type'] == 'pkcs-9-at-extensionRequest') {
                            $path = "$pth/$key/value/0";
                            break 2;
                        }
                    }
                    if ($create) {
                        $key = count($attributes);
                        $attributes[] = array('type' => 'pkcs-9-at-extensionRequest', 'value' => array());
                        $path = "$pth/$key/value/0";
                    }
                }
                break;
        }

        $extensions = &$this->_subArray($root, $path, $create);

        if (!is_array($extensions)) {
            $false = false;
            return $false;
        }

        return $extensions;
    }

    /**
     * Remove an Extension
     *
     * @param string $id
     * @param string $path optional
     * @access private
     * @return bool
     */
    function _removeExtension($id, $path = null)
    {
        $extensions = &$this->_extensions($this->currentCert, $path);

        if (!is_array($extensions)) {
            return false;
        }

        $result = false;
        foreach ($extensions as $key => $value) {
            if ($value['extnId'] == $id) {
                unset($extensions[$key]);
                $result = true;
            }
        }

        $extensions = array_values($extensions);
        // fix for https://bugs.php.net/75433 affecting PHP 7.2
        if (!isset($extensions[0])) {
            $extensions = array_splice($extensions, 0, 0);
        }
        return $result;
    }

    /**
     * Get an Extension
     *
     * Returns the extension if it exists and false if not
     *
     * @param string $id
     * @param array $cert optional
     * @param string $path optional
     * @access private
     * @return mixed
     */
    function _getExtension($id, $cert = null, $path = null)
    {
        $extensions = $this->_extensions($cert, $path);

        if (!is_array($extensions)) {
            return false;
        }

        foreach ($extensions as $key => $value) {
            if ($value['extnId'] == $id) {
                return $value['extnValue'];
            }
        }

        return false;
    }

    /**
     * Returns a list of all extensions in use
     *
     * @param array $cert optional
     * @param string $path optional
     * @access private
     * @return array
     */
    function _getExtensions($cert = null, $path = null)
    {
        $exts = $this->_extensions($cert, $path);
        $extensions = array();

        if (is_array($exts)) {
            foreach ($exts as $extension) {
                $extensions[] = $extension['extnId'];
            }
        }

        return $extensions;
    }

    /**
     * Set an Extension
     *
     * @param string $id
     * @param mixed $value
     * @param bool $critical optional
     * @param bool $replace optional
     * @param string $path optional
     * @access private
     * @return bool
     */
    function _setExtension($id, $value, $critical = false, $replace = true, $path = null)
    {
        $extensions = &$this->_extensions($this->currentCert, $path, true);

        if (!is_array($extensions)) {
            return false;
        }

        $newext = array('extnId'  => $id, 'critical' => $critical, 'extnValue' => $value);

        foreach ($extensions as $key => $value) {
            if ($value['extnId'] == $id) {
                if (!$replace) {
                    return false;
                }

                $extensions[$key] = $newext;
                return true;
            }
        }

        $extensions[] = $newext;
        return true;
    }

    /**
     * Remove a certificate, CSR or CRL Extension
     *
     * @param string $id
     * @access public
     * @return bool
     */
    function removeExtension($id)
    {
        return $this->_removeExtension($id);
    }

    /**
     * Get a certificate, CSR or CRL Extension
     *
     * Returns the extension if it exists and false if not
     *
     * @param string $id
     * @param array $cert optional
     * @access public
     * @return mixed
     */
    function getExtension($id, $cert = null)
    {
        return $this->_getExtension($id, $cert);
    }

    /**
     * Returns a list of all extensions in use in certificate, CSR or CRL
     *
     * @param array $cert optional
     * @access public
     * @return array
     */
    function getExtensions($cert = null)
    {
        return $this->_getExtensions($cert);
    }

    /**
     * Set a certificate, CSR or CRL Extension
     *
     * @param string $id
     * @param mixed $value
     * @param bool $critical optional
     * @param bool $replace optional
     * @access public
     * @return bool
     */
    function setExtension($id, $value, $critical = false, $replace = true)
    {
        return $this->_setExtension($id, $value, $critical, $replace);
    }

    /**
     * Remove a CSR attribute.
     *
     * @param string $id
     * @param int $disposition optional
     * @access public
     * @return bool
     */
    function removeAttribute($id, $disposition = FILE_X509_ATTR_ALL)
    {
        $attributes = &$this->_subArray($this->currentCert, 'certificationRequestInfo/attributes');

        if (!is_array($attributes)) {
            return false;
        }

        $result = false;
        foreach ($attributes as $key => $attribute) {
            if ($attribute['type'] == $id) {
                $n = count($attribute['value']);
                switch (true) {
                    case $disposition == FILE_X509_ATTR_APPEND:
                    case $disposition == FILE_X509_ATTR_REPLACE:
                        return false;
                    case $disposition >= $n:
                        $disposition -= $n;
                        break;
                    case $disposition == FILE_X509_ATTR_ALL:
                    case $n == 1:
                        unset($attributes[$key]);
                        $result = true;
                        break;
                    default:
                        unset($attributes[$key]['value'][$disposition]);
                        $attributes[$key]['value'] = array_values($attributes[$key]['value']);
                        $result = true;
                        break;
                }
                if ($result && $disposition != FILE_X509_ATTR_ALL) {
                    break;
                }
            }
        }

        $attributes = array_values($attributes);
        return $result;
    }

    /**
     * Get a CSR attribute
     *
     * Returns the attribute if it exists and false if not
     *
     * @param string $id
     * @param int $disposition optional
     * @param array $csr optional
     * @access public
     * @return mixed
     */
    function getAttribute($id, $disposition = FILE_X509_ATTR_ALL, $csr = null)
    {
        if (empty($csr)) {
            $csr = $this->currentCert;
        }

        $attributes = $this->_subArray($csr, 'certificationRequestInfo/attributes');

        if (!is_array($attributes)) {
            return false;
        }

        foreach ($attributes as $key => $attribute) {
            if ($attribute['type'] == $id) {
                $n = count($attribute['value']);
                switch (true) {
                    case $disposition == FILE_X509_ATTR_APPEND:
                    case $disposition == FILE_X509_ATTR_REPLACE:
                        return false;
                    case $disposition == FILE_X509_ATTR_ALL:
                        return $attribute['value'];
                    case $disposition >= $n:
                        $disposition -= $n;
                        break;
                    default:
                        return $attribute['value'][$disposition];
                }
            }
        }

        return false;
    }

    /**
     * Returns a list of all CSR attributes in use
     *
     * @param array $csr optional
     * @access public
     * @return array
     */
    function getAttributes($csr = null)
    {
        if (empty($csr)) {
            $csr = $this->currentCert;
        }

        $attributes = $this->_subArray($csr, 'certificationRequestInfo/attributes');
        $attrs = array();

        if (is_array($attributes)) {
            foreach ($attributes as $attribute) {
                $attrs[] = $attribute['type'];
            }
        }

        return $attrs;
    }

    /**
     * Set a CSR attribute
     *
     * @param string $id
     * @param mixed $value
     * @param bool $disposition optional
     * @access public
     * @return bool
     */
    function setAttribute($id, $value, $disposition = FILE_X509_ATTR_ALL)
    {
        $attributes = &$this->_subArray($this->currentCert, 'certificationRequestInfo/attributes', true);

        if (!is_array($attributes)) {
            return false;
        }

        switch ($disposition) {
            case FILE_X509_ATTR_REPLACE:
                $disposition = FILE_X509_ATTR_APPEND;
            case FILE_X509_ATTR_ALL:
                $this->removeAttribute($id);
                break;
        }

        foreach ($attributes as $key => $attribute) {
            if ($attribute['type'] == $id) {
                $n = count($attribute['value']);
                switch (true) {
                    case $disposition == FILE_X509_ATTR_APPEND:
                        $last = $key;
                        break;
                    case $disposition >= $n:
                        $disposition -= $n;
                        break;
                    default:
                        $attributes[$key]['value'][$disposition] = $value;
                        return true;
                }
            }
        }

        switch (true) {
            case $disposition >= 0:
                return false;
            case isset($last):
                $attributes[$last]['value'][] = $value;
                break;
            default:
                $attributes[] = array('type' => $id, 'value' => $disposition == FILE_X509_ATTR_ALL ? $value: array($value));
                break;
        }

        return true;
    }

    /**
     * Sets the subject key identifier
     *
     * This is used by the id-ce-authorityKeyIdentifier and the id-ce-subjectKeyIdentifier extensions.
     *
     * @param string $value
     * @access public
     */
    function setKeyIdentifier($value)
    {
        if (empty($value)) {
            unset($this->currentKeyIdentifier);
        } else {
            $this->currentKeyIdentifier = base64_encode($value);
        }
    }

    /**
     * Compute a public key identifier.
     *
     * Although key identifiers may be set to any unique value, this function
     * computes key identifiers from public key according to the two
     * recommended methods (4.2.1.2 RFC 3280).
     * Highly polymorphic: try to accept all possible forms of key:
     * - Key object
     * - File_X509 object with public or private key defined
     * - Certificate or CSR array
     * - File_ASN1_Element object
     * - PEM or DER string
     *
     * @param mixed $key optional
     * @param int $method optional
     * @access public
     * @return string binary key identifier
     */
    function computeKeyIdentifier($key = null, $method = 1)
    {
        if (is_null($key)) {
            $key = $this;
        }

        switch (true) {
            case is_string($key):
                break;
            case is_array($key) && isset($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
                return $this->computeKeyIdentifier($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'], $method);
            case is_array($key) && isset($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
                return $this->computeKeyIdentifier($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'], $method);
            case !is_object($key):
                return false;
            case strtolower(get_class($key)) == 'file_asn1_element':
                // Assume the element is a bitstring-packed key.
                $asn1 = new File_ASN1();
                $decoded = $asn1->decodeBER($key->element);
                if (empty($decoded)) {
                    return false;
                }
                $raw = $asn1->asn1map($decoded[0], array('type' => FILE_ASN1_TYPE_BIT_STRING));
                if (empty($raw)) {
                    return false;
                }
                $raw = base64_decode($raw);
                // If the key is private, compute identifier from its corresponding public key.
                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }
                $key = new Crypt_RSA();
                if (!$key->loadKey($raw)) {
                    return false;   // Not an unencrypted RSA key.
                }
                if ($key->getPrivateKey() !== false) {  // If private.
                    return $this->computeKeyIdentifier($key, $method);
                }
                $key = $raw;    // Is a public key.
                break;
            case strtolower(get_class($key)) == 'file_x509':
                if (isset($key->publicKey)) {
                    return $this->computeKeyIdentifier($key->publicKey, $method);
                }
                if (isset($key->privateKey)) {
                    return $this->computeKeyIdentifier($key->privateKey, $method);
                }
                if (isset($key->currentCert['tbsCertificate']) || isset($key->currentCert['certificationRequestInfo'])) {
                    return $this->computeKeyIdentifier($key->currentCert, $method);
                }
                return false;
            default: // Should be a key object (i.e.: Crypt_RSA).
                $key = $key->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_PKCS1);
                break;
        }

        // If in PEM format, convert to binary.
        $key = $this->_extractBER($key);

        // Now we have the key string: compute its sha-1 sum.
        if (!class_exists('Crypt_Hash')) {
            include_once 'Crypt/Hash.php';
        }
        $hash = new Crypt_Hash('sha1');
        $hash = $hash->hash($key);

        if ($method == 2) {
            $hash = substr($hash, -8);
            $hash[0] = chr((ord($hash[0]) & 0x0F) | 0x40);
        }

        return $hash;
    }

    /**
     * Format a public key as appropriate
     *
     * @access private
     * @return array
     */
    function _formatSubjectPublicKey()
    {
        if (!isset($this->publicKey) || !is_object($this->publicKey)) {
            return false;
        }

        switch (strtolower(get_class($this->publicKey))) {
            case 'crypt_rsa':
                // the following two return statements do the same thing. i dunno.. i just prefer the later for some reason.
                // the former is a good example of how to do fuzzing on the public key
                //return new File_ASN1_Element(base64_decode(preg_replace('#-.+-|[\r\n]#', '', $this->publicKey->getPublicKey())));
                return array(
                    'algorithm' => array('algorithm' => 'rsaEncryption'),
                    'subjectPublicKey' => $this->publicKey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
                );
            default:
                return false;
        }
    }

    /**
     * Set the domain name's which the cert is to be valid for
     *
     * @access public
     * @return array
     */
    function setDomain()
    {
        $this->domains = func_get_args();
        $this->removeDNProp('id-at-commonName');
        $this->setDNProp('id-at-commonName', $this->domains[0]);
    }

    /**
     * Set the IP Addresses's which the cert is to be valid for
     *
     * @access public
     * @param string $ipAddress optional
     */
    function setIPAddress()
    {
        $this->ipAddresses = func_get_args();
        /*
        if (!isset($this->domains)) {
            $this->removeDNProp('id-at-commonName');
            $this->setDNProp('id-at-commonName', $this->ipAddresses[0]);
        }
        */
    }

    /**
     * Helper function to build domain array
     *
     * @access private
     * @param string $domain
     * @return array
     */
    function _dnsName($domain)
    {
        return array('dNSName' => $domain);
    }

    /**
     * Helper function to build IP Address array
     *
     * (IPv6 is not currently supported)
     *
     * @access private
     * @param string $address
     * @return array
     */
    function _iPAddress($address)
    {
        return array('iPAddress' => $address);
    }

    /**
     * Get the index of a revoked certificate.
     *
     * @param array $rclist
     * @param string $serial
     * @param bool $create optional
     * @access private
     * @return int|false
     */
    function _revokedCertificate(&$rclist, $serial, $create = false)
    {
        $serial = new Math_BigInteger($serial);

        foreach ($rclist as $i => $rc) {
            if (!($serial->compare($rc['userCertificate']))) {
                return $i;
            }
        }

        if (!$create) {
            return false;
        }

        if (!class_exists('DateTime')) {
            $revocationDate = @date('D, d M Y H:i:s O');
        } else {
            $revocationDate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
            $revocationDate = $revocationDate->format('D, d M Y H:i:s O');
        }

        $i = count($rclist);
        $rclist[] = array('userCertificate' => $serial,
                          'revocationDate'  => $this->_timeField($revocationDate));
        return $i;
    }

    /**
     * Revoke a certificate.
     *
     * @param string $serial
     * @param string $date optional
     * @access public
     * @return bool
     */
    function revoke($serial, $date = null)
    {
        if (isset($this->currentCert['tbsCertList'])) {
            if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
                if ($this->_revokedCertificate($rclist, $serial) === false) { // If not yet revoked
                    if (($i = $this->_revokedCertificate($rclist, $serial, true)) !== false) {
                        if (!empty($date)) {
                            $rclist[$i]['revocationDate'] = $this->_timeField($date);
                        }

                        return true;
                    }
                }
            }
        }

        return false;
    }

    /**
     * Unrevoke a certificate.
     *
     * @param string $serial
     * @access public
     * @return bool
     */
    function unrevoke($serial)
    {
        if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                unset($rclist[$i]);
                $rclist = array_values($rclist);
                return true;
            }
        }

        return false;
    }

    /**
     * Get a revoked certificate.
     *
     * @param string $serial
     * @access public
     * @return mixed
     */
    function getRevoked($serial)
    {
        if (is_array($rclist = $this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                return $rclist[$i];
            }
        }

        return false;
    }

    /**
     * List revoked certificates
     *
     * @param array $crl optional
     * @access public
     * @return array
     */
    function listRevoked($crl = null)
    {
        if (!isset($crl)) {
            $crl = $this->currentCert;
        }

        if (!isset($crl['tbsCertList'])) {
            return false;
        }

        $result = array();

        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
            foreach ($rclist as $rc) {
                $result[] = $rc['userCertificate']->toString();
            }
        }

        return $result;
    }

    /**
     * Remove a Revoked Certificate Extension
     *
     * @param string $serial
     * @param string $id
     * @access public
     * @return bool
     */
    function removeRevokedCertificateExtension($serial, $id)
    {
        if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                return $this->_removeExtension($id, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
            }
        }

        return false;
    }

    /**
     * Get a Revoked Certificate Extension
     *
     * Returns the extension if it exists and false if not
     *
     * @param string $serial
     * @param string $id
     * @param array $crl optional
     * @access public
     * @return mixed
     */
    function getRevokedCertificateExtension($serial, $id, $crl = null)
    {
        if (!isset($crl)) {
            $crl = $this->currentCert;
        }

        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                return $this->_getExtension($id, $crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
            }
        }

        return false;
    }

    /**
     * Returns a list of all extensions in use for a given revoked certificate
     *
     * @param string $serial
     * @param array $crl optional
     * @access public
     * @return array
     */
    function getRevokedCertificateExtensions($serial, $crl = null)
    {
        if (!isset($crl)) {
            $crl = $this->currentCert;
        }

        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                return $this->_getExtensions($crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
            }
        }

        return false;
    }

    /**
     * Set a Revoked Certificate Extension
     *
     * @param string $serial
     * @param string $id
     * @param mixed $value
     * @param bool $critical optional
     * @param bool $replace optional
     * @access public
     * @return bool
     */
    function setRevokedCertificateExtension($serial, $id, $value, $critical = false, $replace = true)
    {
        if (isset($this->currentCert['tbsCertList'])) {
            if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
                if (($i = $this->_revokedCertificate($rclist, $serial, true)) !== false) {
                    return $this->_setExtension($id, $value, $critical, $replace, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
                }
            }
        }

        return false;
    }

    /**
     * Extract raw BER from Base64 encoding
     *
     * @access private
     * @param string $str
     * @return string
     */
    function _extractBER($str)
    {
        /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them
         * above and beyond the ceritificate.
         * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line:
         *
         * Bag Attributes
         *     localKeyID: 01 00 00 00
         * subject=/O=organization/OU=org unit/CN=common name
         * issuer=/O=organization/CN=common name
         */
        $temp = preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1);
        // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
        $temp = preg_replace('#-+[^-]+-+#', '', $temp);
        // remove new lines
        $temp = str_replace(array("\r", "\n", ' '), '', $temp);
        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
        return $temp != false ? $temp : $str;
    }

    /**
     * Returns the OID corresponding to a name
     *
     * What's returned in the associative array returned by loadX509() (or load*()) is either a name or an OID if
     * no OID to name mapping is available. The problem with this is that what may be an unmapped OID in one version
     * of phpseclib may not be unmapped in the next version, so apps that are looking at this OID may not be able
     * to work from version to version.
     *
     * This method will return the OID if a name is passed to it and if no mapping is avialable it'll assume that
     * what's being passed to it already is an OID and return that instead. A few examples.
     *
     * getOID('2.16.840.1.101.3.4.2.1') == '2.16.840.1.101.3.4.2.1'
     * getOID('id-sha256') == '2.16.840.1.101.3.4.2.1'
     * getOID('zzz') == 'zzz'
     *
     * @access public
     * @return string
     */
    function getOID($name)
    {
        static $reverseMap;
        if (!isset($reverseMap)) {
            $reverseMap = array_flip($this->oids);
        }
        return isset($reverseMap[$name]) ? $reverseMap[$name] : $name;
    }
}
phpseclib-1.0.18/phpseclib/Math/000077500000000000000000000000001354156543400164265ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/Math/BigInteger.php000066400000000000000000003774271354156543400212020ustar00rootroot00000000000000> and << cannot be used, nor can the modulo operator %,
 * which only supports integers.  Although this fact will slow this library down, the fact that such a high
 * base is being used should more than compensate.
 *
 * Numbers are stored in {@link http://en.wikipedia.org/wiki/Endianness little endian} format.  ie.
 * (new Math_BigInteger(pow(2, 26)))->value = array(0, 1)
 *
 * Useful resources are as follows:
 *
 *  - {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf Handbook of Applied Cryptography (HAC)}
 *  - {@link http://math.libtomcrypt.com/files/tommath.pdf Multi-Precision Math (MPM)}
 *  - Java's BigInteger classes.  See /j2se/src/share/classes/java/math in jdk-1_5_0-src-jrl.zip
 *
 * Here's an example of how to use this library:
 * 
 * add($b);
 *
 *    echo $c->toString(); // outputs 5
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Math
 * @package   Math_BigInteger
 * @author    Jim Wigginton 
 * @copyright 2006 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

/**#@+
 * Reduction constants
 *
 * @access private
 * @see self::_reduce()
 */
/**
 * @see self::_montgomery()
 * @see self::_prepMontgomery()
 */
define('MATH_BIGINTEGER_MONTGOMERY', 0);
/**
 * @see self::_barrett()
 */
define('MATH_BIGINTEGER_BARRETT', 1);
/**
 * @see self::_mod2()
 */
define('MATH_BIGINTEGER_POWEROF2', 2);
/**
 * @see self::_remainder()
 */
define('MATH_BIGINTEGER_CLASSIC', 3);
/**
 * @see self::__clone()
 */
define('MATH_BIGINTEGER_NONE', 4);
/**#@-*/

/**#@+
 * Array constants
 *
 * Rather than create a thousands and thousands of new Math_BigInteger objects in repeated function calls to add() and
 * multiply() or whatever, we'll just work directly on arrays, taking them in as parameters and returning them.
 *
 * @access private
 */
/**
 * $result[MATH_BIGINTEGER_VALUE] contains the value.
 */
define('MATH_BIGINTEGER_VALUE', 0);
/**
 * $result[MATH_BIGINTEGER_SIGN] contains the sign.
 */
define('MATH_BIGINTEGER_SIGN', 1);
/**#@-*/

/**#@+
 * @access private
 * @see self::_montgomery()
 * @see self::_barrett()
 */
/**
 * Cache constants
 *
 * $cache[MATH_BIGINTEGER_VARIABLE] tells us whether or not the cached data is still valid.
 */
define('MATH_BIGINTEGER_VARIABLE', 0);
/**
 * $cache[MATH_BIGINTEGER_DATA] contains the cached data.
 */
define('MATH_BIGINTEGER_DATA', 1);
/**#@-*/

/**#@+
 * Mode constants.
 *
 * @access private
 * @see self::Math_BigInteger()
 */
/**
 * To use the pure-PHP implementation
 */
define('MATH_BIGINTEGER_MODE_INTERNAL', 1);
/**
 * To use the BCMath library
 *
 * (if enabled; otherwise, the internal implementation will be used)
 */
define('MATH_BIGINTEGER_MODE_BCMATH', 2);
/**
 * To use the GMP library
 *
 * (if present; otherwise, either the BCMath or the internal implementation will be used)
 */
define('MATH_BIGINTEGER_MODE_GMP', 3);
/**#@-*/

/**
 * Karatsuba Cutoff
 *
 * At what point do we switch between Karatsuba multiplication and schoolbook long multiplication?
 *
 * @access private
 */
define('MATH_BIGINTEGER_KARATSUBA_CUTOFF', 25);

/**
 * Pure-PHP arbitrary precision integer arithmetic library. Supports base-2, base-10, base-16, and base-256
 * numbers.
 *
 * @package Math_BigInteger
 * @author  Jim Wigginton 
 * @access  public
 */
class Math_BigInteger
{
    /**
     * Holds the BigInteger's value.
     *
     * @var array
     * @access private
     */
    var $value;

    /**
     * Holds the BigInteger's magnitude.
     *
     * @var bool
     * @access private
     */
    var $is_negative = false;

    /**
     * Precision
     *
     * @see self::setPrecision()
     * @access private
     */
    var $precision = -1;

    /**
     * Precision Bitmask
     *
     * @see self::setPrecision()
     * @access private
     */
    var $bitmask = false;

    /**
     * Mode independent value used for serialization.
     *
     * If the bcmath or gmp extensions are installed $this->value will be a non-serializable resource, hence the need for
     * a variable that'll be serializable regardless of whether or not extensions are being used.  Unlike $this->value,
     * however, $this->hex is only calculated when $this->__sleep() is called.
     *
     * @see self::__sleep()
     * @see self::__wakeup()
     * @var string
     * @access private
     */
    var $hex;

    /**
     * Converts base-2, base-10, base-16, and binary strings (base-256) to BigIntegers.
     *
     * If the second parameter - $base - is negative, then it will be assumed that the number's are encoded using
     * two's compliment.  The sole exception to this is -10, which is treated the same as 10 is.
     *
     * Here's an example:
     * 
     * toString(); // outputs 50
     * ?>
     * 
     *
     * @param $x base-10 number or base-$base number if $base set.
     * @param int $base
     * @return Math_BigInteger
     * @access public
     */
    function __construct($x = 0, $base = 10)
    {
        if (!defined('MATH_BIGINTEGER_MODE')) {
            switch (true) {
                case extension_loaded('gmp'):
                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_GMP);
                    break;
                case extension_loaded('bcmath'):
                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_BCMATH);
                    break;
                default:
                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_INTERNAL);
            }
        }

        if (extension_loaded('openssl') && !defined('MATH_BIGINTEGER_OPENSSL_DISABLE') && !defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
            // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
            ob_start();
            @phpinfo();
            $content = ob_get_contents();
            ob_end_clean();

            preg_match_all('#OpenSSL (Header|Library) Version(.*)#im', $content, $matches);

            $versions = array();
            if (!empty($matches[1])) {
                for ($i = 0; $i < count($matches[1]); $i++) {
                    $fullVersion = trim(str_replace('=>', '', strip_tags($matches[2][$i])));

                    // Remove letter part in OpenSSL version
                    if (!preg_match('/(\d+\.\d+\.\d+)/i', $fullVersion, $m)) {
                        $versions[$matches[1][$i]] = $fullVersion;
                    } else {
                        $versions[$matches[1][$i]] = $m[0];
                    }
                }
            }

            // it doesn't appear that OpenSSL versions were reported upon until PHP 5.3+
            switch (true) {
                case !isset($versions['Header']):
                case !isset($versions['Library']):
                case $versions['Header'] == $versions['Library']:
                case version_compare($versions['Header'], '1.0.0') >= 0 && version_compare($versions['Library'], '1.0.0') >= 0:
                    define('MATH_BIGINTEGER_OPENSSL_ENABLED', true);
                    break;
                default:
                    define('MATH_BIGINTEGER_OPENSSL_DISABLE', true);
            }
        }

        if (!defined('PHP_INT_SIZE')) {
            define('PHP_INT_SIZE', 4);
        }

        if (!defined('MATH_BIGINTEGER_BASE') && MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_INTERNAL) {
            switch (PHP_INT_SIZE) {
                case 8: // use 64-bit integers if int size is 8 bytes
                    define('MATH_BIGINTEGER_BASE',       31);
                    define('MATH_BIGINTEGER_BASE_FULL',  0x80000000);
                    define('MATH_BIGINTEGER_MAX_DIGIT',  0x7FFFFFFF);
                    define('MATH_BIGINTEGER_MSB',        0x40000000);
                    // 10**9 is the closest we can get to 2**31 without passing it
                    define('MATH_BIGINTEGER_MAX10',      1000000000);
                    define('MATH_BIGINTEGER_MAX10_LEN',  9);
                    // the largest digit that may be used in addition / subtraction
                    define('MATH_BIGINTEGER_MAX_DIGIT2', pow(2, 62));
                    break;
                //case 4: // use 64-bit floats if int size is 4 bytes
                default:
                    define('MATH_BIGINTEGER_BASE',       26);
                    define('MATH_BIGINTEGER_BASE_FULL',  0x4000000);
                    define('MATH_BIGINTEGER_MAX_DIGIT',  0x3FFFFFF);
                    define('MATH_BIGINTEGER_MSB',        0x2000000);
                    // 10**7 is the closest to 2**26 without passing it
                    define('MATH_BIGINTEGER_MAX10',      10000000);
                    define('MATH_BIGINTEGER_MAX10_LEN',  7);
                    // the largest digit that may be used in addition / subtraction
                    // we do pow(2, 52) instead of using 4503599627370496 directly because some
                    // PHP installations will truncate 4503599627370496.
                    define('MATH_BIGINTEGER_MAX_DIGIT2', pow(2, 52));
            }
        }

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                switch (true) {
                    case is_resource($x) && get_resource_type($x) == 'GMP integer':
                    // PHP 5.6 switched GMP from using resources to objects
                    case is_object($x) && get_class($x) == 'GMP':
                        $this->value = $x;
                        return;
                }
                $this->value = gmp_init(0);
                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                $this->value = '0';
                break;
            default:
                $this->value = array();
        }

        // '0' counts as empty() but when the base is 256 '0' is equal to ord('0') or 48
        // '0' is the only value like this per http://php.net/empty
        if (empty($x) && (abs($base) != 256 || $x !== '0')) {
            return;
        }

        switch ($base) {
            case -256:
                if (ord($x[0]) & 0x80) {
                    $x = ~$x;
                    $this->is_negative = true;
                }
            case 256:
                switch (MATH_BIGINTEGER_MODE) {
                    case MATH_BIGINTEGER_MODE_GMP:
                        $this->value = function_exists('gmp_import') ?
                            gmp_import($x) :
                            gmp_init('0x' . bin2hex($x));
                        if ($this->is_negative) {
                            $this->value = gmp_neg($this->value);
                        }
                        break;
                    case MATH_BIGINTEGER_MODE_BCMATH:
                        // round $len to the nearest 4 (thanks, DavidMJ!)
                        $len = (strlen($x) + 3) & 0xFFFFFFFC;

                        $x = str_pad($x, $len, chr(0), STR_PAD_LEFT);

                        for ($i = 0; $i < $len; $i+= 4) {
                            $this->value = bcmul($this->value, '4294967296', 0); // 4294967296 == 2**32
                            $this->value = bcadd($this->value, 0x1000000 * ord($x[$i]) + ((ord($x[$i + 1]) << 16) | (ord($x[$i + 2]) << 8) | ord($x[$i + 3])), 0);
                        }

                        if ($this->is_negative) {
                            $this->value = '-' . $this->value;
                        }

                        break;
                    // converts a base-2**8 (big endian / msb) number to base-2**26 (little endian / lsb)
                    default:
                        while (strlen($x)) {
                            $this->value[] = $this->_bytes2int($this->_base256_rshift($x, MATH_BIGINTEGER_BASE));
                        }
                }

                if ($this->is_negative) {
                    if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
                        $this->is_negative = false;
                    }
                    $temp = $this->add(new Math_BigInteger('-1'));
                    $this->value = $temp->value;
                }
                break;
            case 16:
            case -16:
                if ($base > 0 && $x[0] == '-') {
                    $this->is_negative = true;
                    $x = substr($x, 1);
                }

                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);

                $is_negative = false;
                if ($base < 0 && hexdec($x[0]) >= 8) {
                    $this->is_negative = $is_negative = true;
                    $x = bin2hex(~pack('H*', $x));
                }

                switch (MATH_BIGINTEGER_MODE) {
                    case MATH_BIGINTEGER_MODE_GMP:
                        $temp = $this->is_negative ? '-0x' . $x : '0x' . $x;
                        $this->value = gmp_init($temp);
                        $this->is_negative = false;
                        break;
                    case MATH_BIGINTEGER_MODE_BCMATH:
                        $x = (strlen($x) & 1) ? '0' . $x : $x;
                        $temp = new Math_BigInteger(pack('H*', $x), 256);
                        $this->value = $this->is_negative ? '-' . $temp->value : $temp->value;
                        $this->is_negative = false;
                        break;
                    default:
                        $x = (strlen($x) & 1) ? '0' . $x : $x;
                        $temp = new Math_BigInteger(pack('H*', $x), 256);
                        $this->value = $temp->value;
                }

                if ($is_negative) {
                    $temp = $this->add(new Math_BigInteger('-1'));
                    $this->value = $temp->value;
                }
                break;
            case 10:
            case -10:
                // (?value = gmp_init($x);
                        break;
                    case MATH_BIGINTEGER_MODE_BCMATH:
                        // explicitly casting $x to a string is necessary, here, since doing $x[0] on -1 yields different
                        // results then doing it on '-1' does (modInverse does $x[0])
                        $this->value = $x === '-' ? '0' : (string) $x;
                        break;
                    default:
                        $temp = new Math_BigInteger();

                        $multiplier = new Math_BigInteger();
                        $multiplier->value = array(MATH_BIGINTEGER_MAX10);

                        if ($x[0] == '-') {
                            $this->is_negative = true;
                            $x = substr($x, 1);
                        }

                        $x = str_pad($x, strlen($x) + ((MATH_BIGINTEGER_MAX10_LEN - 1) * strlen($x)) % MATH_BIGINTEGER_MAX10_LEN, 0, STR_PAD_LEFT);
                        while (strlen($x)) {
                            $temp = $temp->multiply($multiplier);
                            $temp = $temp->add(new Math_BigInteger($this->_int2bytes(substr($x, 0, MATH_BIGINTEGER_MAX10_LEN)), 256));
                            $x = substr($x, MATH_BIGINTEGER_MAX10_LEN);
                        }

                        $this->value = $temp->value;
                }
                break;
            case 2: // base-2 support originally implemented by Lluis Pamies - thanks!
            case -2:
                if ($base > 0 && $x[0] == '-') {
                    $this->is_negative = true;
                    $x = substr($x, 1);
                }

                $x = preg_replace('#^([01]*).*#', '$1', $x);
                $x = str_pad($x, strlen($x) + (3 * strlen($x)) % 4, 0, STR_PAD_LEFT);

                $str = '0x';
                while (strlen($x)) {
                    $part = substr($x, 0, 4);
                    $str.= dechex(bindec($part));
                    $x = substr($x, 4);
                }

                if ($this->is_negative) {
                    $str = '-' . $str;
                }

                $temp = new Math_BigInteger($str, 8 * $base); // ie. either -16 or +16
                $this->value = $temp->value;
                $this->is_negative = $temp->is_negative;

                break;
            default:
                // base not supported, so we'll let $this == 0
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param $x base-10 number or base-$base number if $base set.
     * @param int $base
     * @access public
     */
    function Math_BigInteger($x = 0, $base = 10)
    {
        $this->__construct($x, $base);
    }

    /**
     * Converts a BigInteger to a byte string (eg. base-256).
     *
     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
     * saved as two's compliment.
     *
     * Here's an example:
     * 
     * toBytes(); // outputs chr(65)
     * ?>
     * 
     *
     * @param bool $twos_compliment
     * @return string
     * @access public
     * @internal Converts a base-2**26 number to base-2**8
     */
    function toBytes($twos_compliment = false)
    {
        if ($twos_compliment) {
            $comparison = $this->compare(new Math_BigInteger());
            if ($comparison == 0) {
                return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
            }

            $temp = $comparison < 0 ? $this->add(new Math_BigInteger(1)) : $this->copy();
            $bytes = $temp->toBytes();

            if (!strlen($bytes)) { // eg. if the number we're trying to convert is -1
                $bytes = chr(0);
            }

            if ($this->precision <= 0 && (ord($bytes[0]) & 0x80)) {
                $bytes = chr(0) . $bytes;
            }

            return $comparison < 0 ? ~$bytes : $bytes;
        }

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                if (gmp_cmp($this->value, gmp_init(0)) == 0) {
                    return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
                }

                if (function_exists('gmp_export')) {
                    $temp = gmp_export($this->value);
                } else {
                    $temp = gmp_strval(gmp_abs($this->value), 16);
                    $temp = (strlen($temp) & 1) ? '0' . $temp : $temp;
                    $temp = pack('H*', $temp);
                }

                return $this->precision > 0 ?
                    substr(str_pad($temp, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
                    ltrim($temp, chr(0));
            case MATH_BIGINTEGER_MODE_BCMATH:
                if ($this->value === '0') {
                    return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
                }

                $value = '';
                $current = $this->value;

                if ($current[0] == '-') {
                    $current = substr($current, 1);
                }

                while (bccomp($current, '0', 0) > 0) {
                    $temp = bcmod($current, '16777216');
                    $value = chr($temp >> 16) . chr($temp >> 8) . chr($temp) . $value;
                    $current = bcdiv($current, '16777216', 0);
                }

                return $this->precision > 0 ?
                    substr(str_pad($value, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
                    ltrim($value, chr(0));
        }

        if (!count($this->value)) {
            return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
        }
        $result = $this->_int2bytes($this->value[count($this->value) - 1]);

        $temp = $this->copy();

        for ($i = count($temp->value) - 2; $i >= 0; --$i) {
            $temp->_base256_lshift($result, MATH_BIGINTEGER_BASE);
            $result = $result | str_pad($temp->_int2bytes($temp->value[$i]), strlen($result), chr(0), STR_PAD_LEFT);
        }

        return $this->precision > 0 ?
            str_pad(substr($result, -(($this->precision + 7) >> 3)), ($this->precision + 7) >> 3, chr(0), STR_PAD_LEFT) :
            $result;
    }

    /**
     * Converts a BigInteger to a hex string (eg. base-16)).
     *
     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
     * saved as two's compliment.
     *
     * Here's an example:
     * 
     * toHex(); // outputs '41'
     * ?>
     * 
     *
     * @param bool $twos_compliment
     * @return string
     * @access public
     * @internal Converts a base-2**26 number to base-2**8
     */
    function toHex($twos_compliment = false)
    {
        return bin2hex($this->toBytes($twos_compliment));
    }

    /**
     * Converts a BigInteger to a bit string (eg. base-2).
     *
     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
     * saved as two's compliment.
     *
     * Here's an example:
     * 
     * toBits(); // outputs '1000001'
     * ?>
     * 
     *
     * @param bool $twos_compliment
     * @return string
     * @access public
     * @internal Converts a base-2**26 number to base-2**2
     */
    function toBits($twos_compliment = false)
    {
        $hex = $this->toHex($twos_compliment);
        $bits = '';
        for ($i = strlen($hex) - 8, $start = strlen($hex) & 7; $i >= $start; $i-=8) {
            $bits = str_pad(decbin(hexdec(substr($hex, $i, 8))), 32, '0', STR_PAD_LEFT) . $bits;
        }
        if ($start) { // hexdec('') == 0
            $bits = str_pad(decbin(hexdec(substr($hex, 0, $start))), 8, '0', STR_PAD_LEFT) . $bits;
        }
        $result = $this->precision > 0 ? substr($bits, -$this->precision) : ltrim($bits, '0');

        if ($twos_compliment && $this->compare(new Math_BigInteger()) > 0 && $this->precision <= 0) {
            return '0' . $result;
        }

        return $result;
    }

    /**
     * Converts a BigInteger to a base-10 number.
     *
     * Here's an example:
     * 
     * toString(); // outputs 50
     * ?>
     * 
     *
     * @return string
     * @access public
     * @internal Converts a base-2**26 number to base-10**7 (which is pretty much base-10)
     */
    function toString()
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                return gmp_strval($this->value);
            case MATH_BIGINTEGER_MODE_BCMATH:
                if ($this->value === '0') {
                    return '0';
                }

                return ltrim($this->value, '0');
        }

        if (!count($this->value)) {
            return '0';
        }

        $temp = $this->copy();
        $temp->bitmask = false;
        $temp->is_negative = false;

        $divisor = new Math_BigInteger();
        $divisor->value = array(MATH_BIGINTEGER_MAX10);
        $result = '';
        while (count($temp->value)) {
            list($temp, $mod) = $temp->divide($divisor);
            $result = str_pad(isset($mod->value[0]) ? $mod->value[0] : '', MATH_BIGINTEGER_MAX10_LEN, '0', STR_PAD_LEFT) . $result;
        }
        $result = ltrim($result, '0');
        if (empty($result)) {
            $result = '0';
        }

        if ($this->is_negative) {
            $result = '-' . $result;
        }

        return $result;
    }

    /**
     * Copy an object
     *
     * PHP5 passes objects by reference while PHP4 passes by value.  As such, we need a function to guarantee
     * that all objects are passed by value, when appropriate.  More information can be found here:
     *
     * {@link http://php.net/language.oop5.basic#51624}
     *
     * @access public
     * @see self::__clone()
     * @return Math_BigInteger
     */
    function copy()
    {
        $temp = new Math_BigInteger();
        $temp->value = $this->value;
        $temp->is_negative = $this->is_negative;
        $temp->precision = $this->precision;
        $temp->bitmask = $this->bitmask;
        return $temp;
    }

    /**
     *  __toString() magic method
     *
     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
     * toString().
     *
     * @access public
     * @internal Implemented per a suggestion by Techie-Michael - thanks!
     */
    function __toString()
    {
        return $this->toString();
    }

    /**
     * __clone() magic method
     *
     * Although you can call Math_BigInteger::__toString() directly in PHP5, you cannot call Math_BigInteger::__clone()
     * directly in PHP5.  You can in PHP4 since it's not a magic method, but in PHP5, you have to call it by using the PHP5
     * only syntax of $y = clone $x.  As such, if you're trying to write an application that works on both PHP4 and PHP5,
     * call Math_BigInteger::copy(), instead.
     *
     * @access public
     * @see self::copy()
     * @return Math_BigInteger
     */
    function __clone()
    {
        return $this->copy();
    }

    /**
     *  __sleep() magic method
     *
     * Will be called, automatically, when serialize() is called on a Math_BigInteger object.
     *
     * @see self::__wakeup()
     * @access public
     */
    function __sleep()
    {
        $this->hex = $this->toHex(true);
        $vars = array('hex');
        if ($this->precision > 0) {
            $vars[] = 'precision';
        }
        return $vars;
    }

    /**
     *  __wakeup() magic method
     *
     * Will be called, automatically, when unserialize() is called on a Math_BigInteger object.
     *
     * @see self::__sleep()
     * @access public
     */
    function __wakeup()
    {
        $temp = new Math_BigInteger($this->hex, -16);
        $this->value = $temp->value;
        $this->is_negative = $temp->is_negative;
        if ($this->precision > 0) {
            // recalculate $this->bitmask
            $this->setPrecision($this->precision);
        }
    }

    /**
     *  __debugInfo() magic method
     *
     * Will be called, automatically, when print_r() or var_dump() are called
     *
     * @access public
     */
    function __debugInfo()
    {
        $opts = array();
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $engine = 'gmp';
                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                $engine = 'bcmath';
                break;
            case MATH_BIGINTEGER_MODE_INTERNAL:
                $engine = 'internal';
                $opts[] = PHP_INT_SIZE == 8 ? '64-bit' : '32-bit';
        }
        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_GMP && defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
            $opts[] = 'OpenSSL';
        }
        if (!empty($opts)) {
            $engine.= ' (' . implode('.', $opts) . ')';
        }
        return array(
            'value' => '0x' . $this->toHex(true),
            'engine' => $engine
        );
    }

    /**
     * Adds two BigIntegers.
     *
     * Here's an example:
     * 
     * add($b);
     *
     *    echo $c->toString(); // outputs 30
     * ?>
     * 
     *
     * @param Math_BigInteger $y
     * @return Math_BigInteger
     * @access public
     * @internal Performs base-2**52 addition
     */
    function add($y)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_add($this->value, $y->value);

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp = new Math_BigInteger();
                $temp->value = bcadd($this->value, $y->value, 0);

                return $this->_normalize($temp);
        }

        $temp = $this->_add($this->value, $this->is_negative, $y->value, $y->is_negative);

        $result = new Math_BigInteger();
        $result->value = $temp[MATH_BIGINTEGER_VALUE];
        $result->is_negative = $temp[MATH_BIGINTEGER_SIGN];

        return $this->_normalize($result);
    }

    /**
     * Performs addition.
     *
     * @param array $x_value
     * @param bool $x_negative
     * @param array $y_value
     * @param bool $y_negative
     * @return array
     * @access private
     */
    function _add($x_value, $x_negative, $y_value, $y_negative)
    {
        $x_size = count($x_value);
        $y_size = count($y_value);

        if ($x_size == 0) {
            return array(
                MATH_BIGINTEGER_VALUE => $y_value,
                MATH_BIGINTEGER_SIGN => $y_negative
            );
        } elseif ($y_size == 0) {
            return array(
                MATH_BIGINTEGER_VALUE => $x_value,
                MATH_BIGINTEGER_SIGN => $x_negative
            );
        }

        // subtract, if appropriate
        if ($x_negative != $y_negative) {
            if ($x_value == $y_value) {
                return array(
                    MATH_BIGINTEGER_VALUE => array(),
                    MATH_BIGINTEGER_SIGN => false
                );
            }

            $temp = $this->_subtract($x_value, false, $y_value, false);
            $temp[MATH_BIGINTEGER_SIGN] = $this->_compare($x_value, false, $y_value, false) > 0 ?
                                          $x_negative : $y_negative;

            return $temp;
        }

        if ($x_size < $y_size) {
            $size = $x_size;
            $value = $y_value;
        } else {
            $size = $y_size;
            $value = $x_value;
        }

        $value[count($value)] = 0; // just in case the carry adds an extra digit

        $carry = 0;
        for ($i = 0, $j = 1; $j < $size; $i+=2, $j+=2) {
            $sum = $x_value[$j] * MATH_BIGINTEGER_BASE_FULL + $x_value[$i] + $y_value[$j] * MATH_BIGINTEGER_BASE_FULL + $y_value[$i] + $carry;
            $carry = $sum >= MATH_BIGINTEGER_MAX_DIGIT2; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
            $sum = $carry ? $sum - MATH_BIGINTEGER_MAX_DIGIT2 : $sum;

            $temp = MATH_BIGINTEGER_BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);

            $value[$i] = (int) ($sum - MATH_BIGINTEGER_BASE_FULL * $temp); // eg. a faster alternative to fmod($sum, 0x4000000)
            $value[$j] = $temp;
        }

        if ($j == $size) { // ie. if $y_size is odd
            $sum = $x_value[$i] + $y_value[$i] + $carry;
            $carry = $sum >= MATH_BIGINTEGER_BASE_FULL;
            $value[$i] = $carry ? $sum - MATH_BIGINTEGER_BASE_FULL : $sum;
            ++$i; // ie. let $i = $j since we've just done $value[$i]
        }

        if ($carry) {
            for (; $value[$i] == MATH_BIGINTEGER_MAX_DIGIT; ++$i) {
                $value[$i] = 0;
            }
            ++$value[$i];
        }

        return array(
            MATH_BIGINTEGER_VALUE => $this->_trim($value),
            MATH_BIGINTEGER_SIGN => $x_negative
        );
    }

    /**
     * Subtracts two BigIntegers.
     *
     * Here's an example:
     * 
     * subtract($b);
     *
     *    echo $c->toString(); // outputs -10
     * ?>
     * 
     *
     * @param Math_BigInteger $y
     * @return Math_BigInteger
     * @access public
     * @internal Performs base-2**52 subtraction
     */
    function subtract($y)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_sub($this->value, $y->value);

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp = new Math_BigInteger();
                $temp->value = bcsub($this->value, $y->value, 0);

                return $this->_normalize($temp);
        }

        $temp = $this->_subtract($this->value, $this->is_negative, $y->value, $y->is_negative);

        $result = new Math_BigInteger();
        $result->value = $temp[MATH_BIGINTEGER_VALUE];
        $result->is_negative = $temp[MATH_BIGINTEGER_SIGN];

        return $this->_normalize($result);
    }

    /**
     * Performs subtraction.
     *
     * @param array $x_value
     * @param bool $x_negative
     * @param array $y_value
     * @param bool $y_negative
     * @return array
     * @access private
     */
    function _subtract($x_value, $x_negative, $y_value, $y_negative)
    {
        $x_size = count($x_value);
        $y_size = count($y_value);

        if ($x_size == 0) {
            return array(
                MATH_BIGINTEGER_VALUE => $y_value,
                MATH_BIGINTEGER_SIGN => !$y_negative
            );
        } elseif ($y_size == 0) {
            return array(
                MATH_BIGINTEGER_VALUE => $x_value,
                MATH_BIGINTEGER_SIGN => $x_negative
            );
        }

        // add, if appropriate (ie. -$x - +$y or +$x - -$y)
        if ($x_negative != $y_negative) {
            $temp = $this->_add($x_value, false, $y_value, false);
            $temp[MATH_BIGINTEGER_SIGN] = $x_negative;

            return $temp;
        }

        $diff = $this->_compare($x_value, $x_negative, $y_value, $y_negative);

        if (!$diff) {
            return array(
                MATH_BIGINTEGER_VALUE => array(),
                MATH_BIGINTEGER_SIGN => false
            );
        }

        // switch $x and $y around, if appropriate.
        if ((!$x_negative && $diff < 0) || ($x_negative && $diff > 0)) {
            $temp = $x_value;
            $x_value = $y_value;
            $y_value = $temp;

            $x_negative = !$x_negative;

            $x_size = count($x_value);
            $y_size = count($y_value);
        }

        // at this point, $x_value should be at least as big as - if not bigger than - $y_value

        $carry = 0;
        for ($i = 0, $j = 1; $j < $y_size; $i+=2, $j+=2) {
            $sum = $x_value[$j] * MATH_BIGINTEGER_BASE_FULL + $x_value[$i] - $y_value[$j] * MATH_BIGINTEGER_BASE_FULL - $y_value[$i] - $carry;
            $carry = $sum < 0; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
            $sum = $carry ? $sum + MATH_BIGINTEGER_MAX_DIGIT2 : $sum;

            $temp = MATH_BIGINTEGER_BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);

            $x_value[$i] = (int) ($sum - MATH_BIGINTEGER_BASE_FULL * $temp);
            $x_value[$j] = $temp;
        }

        if ($j == $y_size) { // ie. if $y_size is odd
            $sum = $x_value[$i] - $y_value[$i] - $carry;
            $carry = $sum < 0;
            $x_value[$i] = $carry ? $sum + MATH_BIGINTEGER_BASE_FULL : $sum;
            ++$i;
        }

        if ($carry) {
            for (; !$x_value[$i]; ++$i) {
                $x_value[$i] = MATH_BIGINTEGER_MAX_DIGIT;
            }
            --$x_value[$i];
        }

        return array(
            MATH_BIGINTEGER_VALUE => $this->_trim($x_value),
            MATH_BIGINTEGER_SIGN => $x_negative
        );
    }

    /**
     * Multiplies two BigIntegers
     *
     * Here's an example:
     * 
     * multiply($b);
     *
     *    echo $c->toString(); // outputs 200
     * ?>
     * 
     *
     * @param Math_BigInteger $x
     * @return Math_BigInteger
     * @access public
     */
    function multiply($x)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_mul($this->value, $x->value);

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp = new Math_BigInteger();
                $temp->value = bcmul($this->value, $x->value, 0);

                return $this->_normalize($temp);
        }

        $temp = $this->_multiply($this->value, $this->is_negative, $x->value, $x->is_negative);

        $product = new Math_BigInteger();
        $product->value = $temp[MATH_BIGINTEGER_VALUE];
        $product->is_negative = $temp[MATH_BIGINTEGER_SIGN];

        return $this->_normalize($product);
    }

    /**
     * Performs multiplication.
     *
     * @param array $x_value
     * @param bool $x_negative
     * @param array $y_value
     * @param bool $y_negative
     * @return array
     * @access private
     */
    function _multiply($x_value, $x_negative, $y_value, $y_negative)
    {
        //if ( $x_value == $y_value ) {
        //    return array(
        //        MATH_BIGINTEGER_VALUE => $this->_square($x_value),
        //        MATH_BIGINTEGER_SIGN => $x_sign != $y_value
        //    );
        //}

        $x_length = count($x_value);
        $y_length = count($y_value);

        if (!$x_length || !$y_length) { // a 0 is being multiplied
            return array(
                MATH_BIGINTEGER_VALUE => array(),
                MATH_BIGINTEGER_SIGN => false
            );
        }

        return array(
            MATH_BIGINTEGER_VALUE => min($x_length, $y_length) < 2 * MATH_BIGINTEGER_KARATSUBA_CUTOFF ?
                $this->_trim($this->_regularMultiply($x_value, $y_value)) :
                $this->_trim($this->_karatsuba($x_value, $y_value)),
            MATH_BIGINTEGER_SIGN => $x_negative != $y_negative
        );
    }

    /**
     * Performs long multiplication on two BigIntegers
     *
     * Modeled after 'multiply' in MutableBigInteger.java.
     *
     * @param array $x_value
     * @param array $y_value
     * @return array
     * @access private
     */
    function _regularMultiply($x_value, $y_value)
    {
        $x_length = count($x_value);
        $y_length = count($y_value);

        if (!$x_length || !$y_length) { // a 0 is being multiplied
            return array();
        }

        if ($x_length < $y_length) {
            $temp = $x_value;
            $x_value = $y_value;
            $y_value = $temp;

            $x_length = count($x_value);
            $y_length = count($y_value);
        }

        $product_value = $this->_array_repeat(0, $x_length + $y_length);

        // the following for loop could be removed if the for loop following it
        // (the one with nested for loops) initially set $i to 0, but
        // doing so would also make the result in one set of unnecessary adds,
        // since on the outermost loops first pass, $product->value[$k] is going
        // to always be 0

        $carry = 0;

        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0
            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
            $product_value[$j] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
        }

        $product_value[$j] = $carry;

        // the above for loop is what the previous comment was talking about.  the
        // following for loop is the "one with nested for loops"
        for ($i = 1; $i < $y_length; ++$i) {
            $carry = 0;

            for ($j = 0, $k = $i; $j < $x_length; ++$j, ++$k) {
                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
                $product_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
            }

            $product_value[$k] = $carry;
        }

        return $product_value;
    }

    /**
     * Performs Karatsuba multiplication on two BigIntegers
     *
     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=120 MPM 5.2.3}.
     *
     * @param array $x_value
     * @param array $y_value
     * @return array
     * @access private
     */
    function _karatsuba($x_value, $y_value)
    {
        $m = min(count($x_value) >> 1, count($y_value) >> 1);

        if ($m < MATH_BIGINTEGER_KARATSUBA_CUTOFF) {
            return $this->_regularMultiply($x_value, $y_value);
        }

        $x1 = array_slice($x_value, $m);
        $x0 = array_slice($x_value, 0, $m);
        $y1 = array_slice($y_value, $m);
        $y0 = array_slice($y_value, 0, $m);

        $z2 = $this->_karatsuba($x1, $y1);
        $z0 = $this->_karatsuba($x0, $y0);

        $z1 = $this->_add($x1, false, $x0, false);
        $temp = $this->_add($y1, false, $y0, false);
        $z1 = $this->_karatsuba($z1[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_VALUE]);
        $temp = $this->_add($z2, false, $z0, false);
        $z1 = $this->_subtract($z1, false, $temp[MATH_BIGINTEGER_VALUE], false);

        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
        $z1[MATH_BIGINTEGER_VALUE] = array_merge(array_fill(0, $m, 0), $z1[MATH_BIGINTEGER_VALUE]);

        $xy = $this->_add($z2, false, $z1[MATH_BIGINTEGER_VALUE], $z1[MATH_BIGINTEGER_SIGN]);
        $xy = $this->_add($xy[MATH_BIGINTEGER_VALUE], $xy[MATH_BIGINTEGER_SIGN], $z0, false);

        return $xy[MATH_BIGINTEGER_VALUE];
    }

    /**
     * Performs squaring
     *
     * @param array $x
     * @return array
     * @access private
     */
    function _square($x = false)
    {
        return count($x) < 2 * MATH_BIGINTEGER_KARATSUBA_CUTOFF ?
            $this->_trim($this->_baseSquare($x)) :
            $this->_trim($this->_karatsubaSquare($x));
    }

    /**
     * Performs traditional squaring on two BigIntegers
     *
     * Squaring can be done faster than multiplying a number by itself can be.  See
     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=7 HAC 14.2.4} /
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=141 MPM 5.3} for more information.
     *
     * @param array $value
     * @return array
     * @access private
     */
    function _baseSquare($value)
    {
        if (empty($value)) {
            return array();
        }
        $square_value = $this->_array_repeat(0, 2 * count($value));

        for ($i = 0, $max_index = count($value) - 1; $i <= $max_index; ++$i) {
            $i2 = $i << 1;

            $temp = $square_value[$i2] + $value[$i] * $value[$i];
            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
            $square_value[$i2] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);

            // note how we start from $i+1 instead of 0 as we do in multiplication.
            for ($j = $i + 1, $k = $i2 + 1; $j <= $max_index; ++$j, ++$k) {
                $temp = $square_value[$k] + 2 * $value[$j] * $value[$i] + $carry;
                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
                $square_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
            }

            // the following line can yield values larger 2**15.  at this point, PHP should switch
            // over to floats.
            $square_value[$i + $max_index + 1] = $carry;
        }

        return $square_value;
    }

    /**
     * Performs Karatsuba "squaring" on two BigIntegers
     *
     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=151 MPM 5.3.4}.
     *
     * @param array $value
     * @return array
     * @access private
     */
    function _karatsubaSquare($value)
    {
        $m = count($value) >> 1;

        if ($m < MATH_BIGINTEGER_KARATSUBA_CUTOFF) {
            return $this->_baseSquare($value);
        }

        $x1 = array_slice($value, $m);
        $x0 = array_slice($value, 0, $m);

        $z2 = $this->_karatsubaSquare($x1);
        $z0 = $this->_karatsubaSquare($x0);

        $z1 = $this->_add($x1, false, $x0, false);
        $z1 = $this->_karatsubaSquare($z1[MATH_BIGINTEGER_VALUE]);
        $temp = $this->_add($z2, false, $z0, false);
        $z1 = $this->_subtract($z1, false, $temp[MATH_BIGINTEGER_VALUE], false);

        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
        $z1[MATH_BIGINTEGER_VALUE] = array_merge(array_fill(0, $m, 0), $z1[MATH_BIGINTEGER_VALUE]);

        $xx = $this->_add($z2, false, $z1[MATH_BIGINTEGER_VALUE], $z1[MATH_BIGINTEGER_SIGN]);
        $xx = $this->_add($xx[MATH_BIGINTEGER_VALUE], $xx[MATH_BIGINTEGER_SIGN], $z0, false);

        return $xx[MATH_BIGINTEGER_VALUE];
    }

    /**
     * Divides two BigIntegers.
     *
     * Returns an array whose first element contains the quotient and whose second element contains the
     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
     * and the divisor (basically, the "common residue" is the first positive modulo).
     *
     * Here's an example:
     * 
     * divide($b);
     *
     *    echo $quotient->toString(); // outputs 0
     *    echo "\r\n";
     *    echo $remainder->toString(); // outputs 10
     * ?>
     * 
     *
     * @param Math_BigInteger $y
     * @return array
     * @access public
     * @internal This function is based off of {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=9 HAC 14.20}.
     */
    function divide($y)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $quotient = new Math_BigInteger();
                $remainder = new Math_BigInteger();

                list($quotient->value, $remainder->value) = gmp_div_qr($this->value, $y->value);

                if (gmp_sign($remainder->value) < 0) {
                    $remainder->value = gmp_add($remainder->value, gmp_abs($y->value));
                }

                return array($this->_normalize($quotient), $this->_normalize($remainder));
            case MATH_BIGINTEGER_MODE_BCMATH:
                $quotient = new Math_BigInteger();
                $remainder = new Math_BigInteger();

                $quotient->value = bcdiv($this->value, $y->value, 0);
                $remainder->value = bcmod($this->value, $y->value);

                if ($remainder->value[0] == '-') {
                    $remainder->value = bcadd($remainder->value, $y->value[0] == '-' ? substr($y->value, 1) : $y->value, 0);
                }

                return array($this->_normalize($quotient), $this->_normalize($remainder));
        }

        if (count($y->value) == 1) {
            list($q, $r) = $this->_divide_digit($this->value, $y->value[0]);
            $quotient = new Math_BigInteger();
            $remainder = new Math_BigInteger();
            $quotient->value = $q;
            $remainder->value = array($r);
            $quotient->is_negative = $this->is_negative != $y->is_negative;
            return array($this->_normalize($quotient), $this->_normalize($remainder));
        }

        static $zero;
        if (!isset($zero)) {
            $zero = new Math_BigInteger();
        }

        $x = $this->copy();
        $y = $y->copy();

        $x_sign = $x->is_negative;
        $y_sign = $y->is_negative;

        $x->is_negative = $y->is_negative = false;

        $diff = $x->compare($y);

        if (!$diff) {
            $temp = new Math_BigInteger();
            $temp->value = array(1);
            $temp->is_negative = $x_sign != $y_sign;
            return array($this->_normalize($temp), $this->_normalize(new Math_BigInteger()));
        }

        if ($diff < 0) {
            // if $x is negative, "add" $y.
            if ($x_sign) {
                $x = $y->subtract($x);
            }
            return array($this->_normalize(new Math_BigInteger()), $this->_normalize($x));
        }

        // normalize $x and $y as described in HAC 14.23 / 14.24
        $msb = $y->value[count($y->value) - 1];
        for ($shift = 0; !($msb & MATH_BIGINTEGER_MSB); ++$shift) {
            $msb <<= 1;
        }
        $x->_lshift($shift);
        $y->_lshift($shift);
        $y_value = &$y->value;

        $x_max = count($x->value) - 1;
        $y_max = count($y->value) - 1;

        $quotient = new Math_BigInteger();
        $quotient_value = &$quotient->value;
        $quotient_value = $this->_array_repeat(0, $x_max - $y_max + 1);

        static $temp, $lhs, $rhs;
        if (!isset($temp)) {
            $temp = new Math_BigInteger();
            $lhs =  new Math_BigInteger();
            $rhs =  new Math_BigInteger();
        }
        $temp_value = &$temp->value;
        $rhs_value =  &$rhs->value;

        // $temp = $y << ($x_max - $y_max-1) in base 2**26
        $temp_value = array_merge($this->_array_repeat(0, $x_max - $y_max), $y_value);

        while ($x->compare($temp) >= 0) {
            // calculate the "common residue"
            ++$quotient_value[$x_max - $y_max];
            $x = $x->subtract($temp);
            $x_max = count($x->value) - 1;
        }

        for ($i = $x_max; $i >= $y_max + 1; --$i) {
            $x_value = &$x->value;
            $x_window = array(
                isset($x_value[$i]) ? $x_value[$i] : 0,
                isset($x_value[$i - 1]) ? $x_value[$i - 1] : 0,
                isset($x_value[$i - 2]) ? $x_value[$i - 2] : 0
            );
            $y_window = array(
                $y_value[$y_max],
                ($y_max > 0) ? $y_value[$y_max - 1] : 0
            );

            $q_index = $i - $y_max - 1;
            if ($x_window[0] == $y_window[0]) {
                $quotient_value[$q_index] = MATH_BIGINTEGER_MAX_DIGIT;
            } else {
                $quotient_value[$q_index] = $this->_safe_divide(
                    $x_window[0] * MATH_BIGINTEGER_BASE_FULL + $x_window[1],
                    $y_window[0]
                );
            }

            $temp_value = array($y_window[1], $y_window[0]);

            $lhs->value = array($quotient_value[$q_index]);
            $lhs = $lhs->multiply($temp);

            $rhs_value = array($x_window[2], $x_window[1], $x_window[0]);

            while ($lhs->compare($rhs) > 0) {
                --$quotient_value[$q_index];

                $lhs->value = array($quotient_value[$q_index]);
                $lhs = $lhs->multiply($temp);
            }

            $adjust = $this->_array_repeat(0, $q_index);
            $temp_value = array($quotient_value[$q_index]);
            $temp = $temp->multiply($y);
            $temp_value = &$temp->value;
            if (count($temp_value)) {
                $temp_value = array_merge($adjust, $temp_value);
            }

            $x = $x->subtract($temp);

            if ($x->compare($zero) < 0) {
                $temp_value = array_merge($adjust, $y_value);
                $x = $x->add($temp);

                --$quotient_value[$q_index];
            }

            $x_max = count($x_value) - 1;
        }

        // unnormalize the remainder
        $x->_rshift($shift);

        $quotient->is_negative = $x_sign != $y_sign;

        // calculate the "common residue", if appropriate
        if ($x_sign) {
            $y->_rshift($shift);
            $x = $y->subtract($x);
        }

        return array($this->_normalize($quotient), $this->_normalize($x));
    }

    /**
     * Divides a BigInteger by a regular integer
     *
     * abc / x = a00 / x + b0 / x + c / x
     *
     * @param array $dividend
     * @param array $divisor
     * @return array
     * @access private
     */
    function _divide_digit($dividend, $divisor)
    {
        $carry = 0;
        $result = array();

        for ($i = count($dividend) - 1; $i >= 0; --$i) {
            $temp = MATH_BIGINTEGER_BASE_FULL * $carry + $dividend[$i];
            $result[$i] = $this->_safe_divide($temp, $divisor);
            $carry = (int) ($temp - $divisor * $result[$i]);
        }

        return array($result, $carry);
    }

    /**
     * Performs modular exponentiation.
     *
     * Here's an example:
     * 
     * modPow($b, $c);
     *
     *    echo $c->toString(); // outputs 10
     * ?>
     * 
     *
     * @param Math_BigInteger $e
     * @param Math_BigInteger $n
     * @return Math_BigInteger
     * @access public
     * @internal The most naive approach to modular exponentiation has very unreasonable requirements, and
     *    and although the approach involving repeated squaring does vastly better, it, too, is impractical
     *    for our purposes.  The reason being that division - by far the most complicated and time-consuming
     *    of the basic operations (eg. +,-,*,/) - occurs multiple times within it.
     *
     *    Modular reductions resolve this issue.  Although an individual modular reduction takes more time
     *    then an individual division, when performed in succession (with the same modulo), they're a lot faster.
     *
     *    The two most commonly used modular reductions are Barrett and Montgomery reduction.  Montgomery reduction,
     *    although faster, only works when the gcd of the modulo and of the base being used is 1.  In RSA, when the
     *    base is a power of two, the modulo - a product of two primes - is always going to have a gcd of 1 (because
     *    the product of two odd numbers is odd), but what about when RSA isn't used?
     *
     *    In contrast, Barrett reduction has no such constraint.  As such, some bigint implementations perform a
     *    Barrett reduction after every operation in the modpow function.  Others perform Barrett reductions when the
     *    modulo is even and Montgomery reductions when the modulo is odd.  BigInteger.java's modPow method, however,
     *    uses a trick involving the Chinese Remainder Theorem to factor the even modulo into two numbers - one odd and
     *    the other, a power of two - and recombine them, later.  This is the method that this modPow function uses.
     *    {@link http://islab.oregonstate.edu/papers/j34monex.pdf Montgomery Reduction with Even Modulus} elaborates.
     */
    function modPow($e, $n)
    {
        $n = $this->bitmask !== false && $this->bitmask->compare($n) < 0 ? $this->bitmask : $n->abs();

        if ($e->compare(new Math_BigInteger()) < 0) {
            $e = $e->abs();

            $temp = $this->modInverse($n);
            if ($temp === false) {
                return false;
            }

            return $this->_normalize($temp->modPow($e, $n));
        }

        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_GMP) {
            $temp = new Math_BigInteger();
            $temp->value = gmp_powm($this->value, $e->value, $n->value);

            return $this->_normalize($temp);
        }

        if ($this->compare(new Math_BigInteger()) < 0 || $this->compare($n) > 0) {
            list(, $temp) = $this->divide($n);
            return $temp->modPow($e, $n);
        }

        if (defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
            $components = array(
                'modulus' => $n->toBytes(true),
                'publicExponent' => $e->toBytes(true)
            );

            $components = array(
                'modulus' => pack('Ca*a*', 2, $this->_encodeASN1Length(strlen($components['modulus'])), $components['modulus']),
                'publicExponent' => pack('Ca*a*', 2, $this->_encodeASN1Length(strlen($components['publicExponent'])), $components['publicExponent'])
            );

            $RSAPublicKey = pack(
                'Ca*a*a*',
                48,
                $this->_encodeASN1Length(strlen($components['modulus']) + strlen($components['publicExponent'])),
                $components['modulus'],
                $components['publicExponent']
            );

            $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
            $RSAPublicKey = chr(0) . $RSAPublicKey;
            $RSAPublicKey = chr(3) . $this->_encodeASN1Length(strlen($RSAPublicKey)) . $RSAPublicKey;

            $encapsulated = pack(
                'Ca*a*',
                48,
                $this->_encodeASN1Length(strlen($rsaOID . $RSAPublicKey)),
                $rsaOID . $RSAPublicKey
            );

            $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
                             chunk_split(base64_encode($encapsulated)) .
                             '-----END PUBLIC KEY-----';

            $plaintext = str_pad($this->toBytes(), strlen($n->toBytes(true)) - 1, "\0", STR_PAD_LEFT);

            if (openssl_public_encrypt($plaintext, $result, $RSAPublicKey, OPENSSL_NO_PADDING)) {
                return new Math_BigInteger($result, 256);
            }
        }

        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
            $temp = new Math_BigInteger();
            $temp->value = bcpowmod($this->value, $e->value, $n->value, 0);

            return $this->_normalize($temp);
        }

        if (empty($e->value)) {
            $temp = new Math_BigInteger();
            $temp->value = array(1);
            return $this->_normalize($temp);
        }

        if ($e->value == array(1)) {
            list(, $temp) = $this->divide($n);
            return $this->_normalize($temp);
        }

        if ($e->value == array(2)) {
            $temp = new Math_BigInteger();
            $temp->value = $this->_square($this->value);
            list(, $temp) = $temp->divide($n);
            return $this->_normalize($temp);
        }

        return $this->_normalize($this->_slidingWindow($e, $n, MATH_BIGINTEGER_BARRETT));

        // the following code, although not callable, can be run independently of the above code
        // although the above code performed better in my benchmarks the following could might
        // perform better under different circumstances. in lieu of deleting it it's just been
        // made uncallable

        // is the modulo odd?
        if ($n->value[0] & 1) {
            return $this->_normalize($this->_slidingWindow($e, $n, MATH_BIGINTEGER_MONTGOMERY));
        }
        // if it's not, it's even

        // find the lowest set bit (eg. the max pow of 2 that divides $n)
        for ($i = 0; $i < count($n->value); ++$i) {
            if ($n->value[$i]) {
                $temp = decbin($n->value[$i]);
                $j = strlen($temp) - strrpos($temp, '1') - 1;
                $j+= 26 * $i;
                break;
            }
        }
        // at this point, 2^$j * $n/(2^$j) == $n

        $mod1 = $n->copy();
        $mod1->_rshift($j);
        $mod2 = new Math_BigInteger();
        $mod2->value = array(1);
        $mod2->_lshift($j);

        $part1 = ($mod1->value != array(1)) ? $this->_slidingWindow($e, $mod1, MATH_BIGINTEGER_MONTGOMERY) : new Math_BigInteger();
        $part2 = $this->_slidingWindow($e, $mod2, MATH_BIGINTEGER_POWEROF2);

        $y1 = $mod2->modInverse($mod1);
        $y2 = $mod1->modInverse($mod2);

        $result = $part1->multiply($mod2);
        $result = $result->multiply($y1);

        $temp = $part2->multiply($mod1);
        $temp = $temp->multiply($y2);

        $result = $result->add($temp);
        list(, $result) = $result->divide($n);

        return $this->_normalize($result);
    }

    /**
     * Performs modular exponentiation.
     *
     * Alias for Math_BigInteger::modPow()
     *
     * @param Math_BigInteger $e
     * @param Math_BigInteger $n
     * @return Math_BigInteger
     * @access public
     */
    function powMod($e, $n)
    {
        return $this->modPow($e, $n);
    }

    /**
     * Sliding Window k-ary Modular Exponentiation
     *
     * Based on {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=27 HAC 14.85} /
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=210 MPM 7.7}.  In a departure from those algorithims,
     * however, this function performs a modular reduction after every multiplication and squaring operation.
     * As such, this function has the same preconditions that the reductions being used do.
     *
     * @param Math_BigInteger $e
     * @param Math_BigInteger $n
     * @param int $mode
     * @return Math_BigInteger
     * @access private
     */
    function _slidingWindow($e, $n, $mode)
    {
        static $window_ranges = array(7, 25, 81, 241, 673, 1793); // from BigInteger.java's oddModPow function
        //static $window_ranges = array(0, 7, 36, 140, 450, 1303, 3529); // from MPM 7.3.1

        $e_value = $e->value;
        $e_length = count($e_value) - 1;
        $e_bits = decbin($e_value[$e_length]);
        for ($i = $e_length - 1; $i >= 0; --$i) {
            $e_bits.= str_pad(decbin($e_value[$i]), MATH_BIGINTEGER_BASE, '0', STR_PAD_LEFT);
        }

        $e_length = strlen($e_bits);

        // calculate the appropriate window size.
        // $window_size == 3 if $window_ranges is between 25 and 81, for example.
        for ($i = 0, $window_size = 1; $i < count($window_ranges) && $e_length > $window_ranges[$i]; ++$window_size, ++$i) {
        }

        $n_value = $n->value;

        // precompute $this^0 through $this^$window_size
        $powers = array();
        $powers[1] = $this->_prepareReduce($this->value, $n_value, $mode);
        $powers[2] = $this->_squareReduce($powers[1], $n_value, $mode);

        // we do every other number since substr($e_bits, $i, $j+1) (see below) is supposed to end
        // in a 1.  ie. it's supposed to be odd.
        $temp = 1 << ($window_size - 1);
        for ($i = 1; $i < $temp; ++$i) {
            $i2 = $i << 1;
            $powers[$i2 + 1] = $this->_multiplyReduce($powers[$i2 - 1], $powers[2], $n_value, $mode);
        }

        $result = array(1);
        $result = $this->_prepareReduce($result, $n_value, $mode);

        for ($i = 0; $i < $e_length;) {
            if (!$e_bits[$i]) {
                $result = $this->_squareReduce($result, $n_value, $mode);
                ++$i;
            } else {
                for ($j = $window_size - 1; $j > 0; --$j) {
                    if (!empty($e_bits[$i + $j])) {
                        break;
                    }
                }

                // eg. the length of substr($e_bits, $i, $j + 1)
                for ($k = 0; $k <= $j; ++$k) {
                    $result = $this->_squareReduce($result, $n_value, $mode);
                }

                $result = $this->_multiplyReduce($result, $powers[bindec(substr($e_bits, $i, $j + 1))], $n_value, $mode);

                $i += $j + 1;
            }
        }

        $temp = new Math_BigInteger();
        $temp->value = $this->_reduce($result, $n_value, $mode);

        return $temp;
    }

    /**
     * Modular reduction
     *
     * For most $modes this will return the remainder.
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @param int $mode
     * @return array
     */
    function _reduce($x, $n, $mode)
    {
        switch ($mode) {
            case MATH_BIGINTEGER_MONTGOMERY:
                return $this->_montgomery($x, $n);
            case MATH_BIGINTEGER_BARRETT:
                return $this->_barrett($x, $n);
            case MATH_BIGINTEGER_POWEROF2:
                $lhs = new Math_BigInteger();
                $lhs->value = $x;
                $rhs = new Math_BigInteger();
                $rhs->value = $n;
                return $x->_mod2($n);
            case MATH_BIGINTEGER_CLASSIC:
                $lhs = new Math_BigInteger();
                $lhs->value = $x;
                $rhs = new Math_BigInteger();
                $rhs->value = $n;
                list(, $temp) = $lhs->divide($rhs);
                return $temp->value;
            case MATH_BIGINTEGER_NONE:
                return $x;
            default:
                // an invalid $mode was provided
        }
    }

    /**
     * Modular reduction preperation
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @param int $mode
     * @return array
     */
    function _prepareReduce($x, $n, $mode)
    {
        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
            return $this->_prepMontgomery($x, $n);
        }
        return $this->_reduce($x, $n, $mode);
    }

    /**
     * Modular multiply
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $y
     * @param array $n
     * @param int $mode
     * @return array
     */
    function _multiplyReduce($x, $y, $n, $mode)
    {
        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
            return $this->_montgomeryMultiply($x, $y, $n);
        }
        $temp = $this->_multiply($x, false, $y, false);
        return $this->_reduce($temp[MATH_BIGINTEGER_VALUE], $n, $mode);
    }

    /**
     * Modular square
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @param int $mode
     * @return array
     */
    function _squareReduce($x, $n, $mode)
    {
        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
            return $this->_montgomeryMultiply($x, $x, $n);
        }
        return $this->_reduce($this->_square($x), $n, $mode);
    }

    /**
     * Modulos for Powers of Two
     *
     * Calculates $x%$n, where $n = 2**$e, for some $e.  Since this is basically the same as doing $x & ($n-1),
     * we'll just use this function as a wrapper for doing that.
     *
     * @see self::_slidingWindow()
     * @access private
     * @param Math_BigInteger
     * @return Math_BigInteger
     */
    function _mod2($n)
    {
        $temp = new Math_BigInteger();
        $temp->value = array(1);
        return $this->bitwise_and($n->subtract($temp));
    }

    /**
     * Barrett Modular Reduction
     *
     * See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=14 HAC 14.3.3} /
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=165 MPM 6.2.5} for more information.  Modified slightly,
     * so as not to require negative numbers (initially, this script didn't support negative numbers).
     *
     * Employs "folding", as described at
     * {@link http://www.cosic.esat.kuleuven.be/publications/thesis-149.pdf#page=66 thesis-149.pdf#page=66}.  To quote from
     * it, "the idea [behind folding] is to find a value x' such that x (mod m) = x' (mod m), with x' being smaller than x."
     *
     * Unfortunately, the "Barrett Reduction with Folding" algorithm described in thesis-149.pdf is not, as written, all that
     * usable on account of (1) its not using reasonable radix points as discussed in
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=162 MPM 6.2.2} and (2) the fact that, even with reasonable
     * radix points, it only works when there are an even number of digits in the denominator.  The reason for (2) is that
     * (x >> 1) + (x >> 1) != x / 2 + x / 2.  If x is even, they're the same, but if x is odd, they're not.  See the in-line
     * comments for details.
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $n
     * @param array $m
     * @return array
     */
    function _barrett($n, $m)
    {
        static $cache = array(
            MATH_BIGINTEGER_VARIABLE => array(),
            MATH_BIGINTEGER_DATA => array()
        );

        $m_length = count($m);

        // if ($this->_compare($n, $this->_square($m)) >= 0) {
        if (count($n) > 2 * $m_length) {
            $lhs = new Math_BigInteger();
            $rhs = new Math_BigInteger();
            $lhs->value = $n;
            $rhs->value = $m;
            list(, $temp) = $lhs->divide($rhs);
            return $temp->value;
        }

        // if (m.length >> 1) + 2 <= m.length then m is too small and n can't be reduced
        if ($m_length < 5) {
            return $this->_regularBarrett($n, $m);
        }

        // n = 2 * m.length

        if (($key = array_search($m, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
            $cache[MATH_BIGINTEGER_VARIABLE][] = $m;

            $lhs = new Math_BigInteger();
            $lhs_value = &$lhs->value;
            $lhs_value = $this->_array_repeat(0, $m_length + ($m_length >> 1));
            $lhs_value[] = 1;
            $rhs = new Math_BigInteger();
            $rhs->value = $m;

            list($u, $m1) = $lhs->divide($rhs);
            $u = $u->value;
            $m1 = $m1->value;

            $cache[MATH_BIGINTEGER_DATA][] = array(
                'u' => $u, // m.length >> 1 (technically (m.length >> 1) + 1)
                'm1'=> $m1 // m.length
            );
        } else {
            extract($cache[MATH_BIGINTEGER_DATA][$key]);
        }

        $cutoff = $m_length + ($m_length >> 1);
        $lsd = array_slice($n, 0, $cutoff); // m.length + (m.length >> 1)
        $msd = array_slice($n, $cutoff);    // m.length >> 1
        $lsd = $this->_trim($lsd);
        $temp = $this->_multiply($msd, false, $m1, false);
        $n = $this->_add($lsd, false, $temp[MATH_BIGINTEGER_VALUE], false); // m.length + (m.length >> 1) + 1

        if ($m_length & 1) {
            return $this->_regularBarrett($n[MATH_BIGINTEGER_VALUE], $m);
        }

        // (m.length + (m.length >> 1) + 1) - (m.length - 1) == (m.length >> 1) + 2
        $temp = array_slice($n[MATH_BIGINTEGER_VALUE], $m_length - 1);
        // if even: ((m.length >> 1) + 2) + (m.length >> 1) == m.length + 2
        // if odd:  ((m.length >> 1) + 2) + (m.length >> 1) == (m.length - 1) + 2 == m.length + 1
        $temp = $this->_multiply($temp, false, $u, false);
        // if even: (m.length + 2) - ((m.length >> 1) + 1) = m.length - (m.length >> 1) + 1
        // if odd:  (m.length + 1) - ((m.length >> 1) + 1) = m.length - (m.length >> 1)
        $temp = array_slice($temp[MATH_BIGINTEGER_VALUE], ($m_length >> 1) + 1);
        // if even: (m.length - (m.length >> 1) + 1) + m.length = 2 * m.length - (m.length >> 1) + 1
        // if odd:  (m.length - (m.length >> 1)) + m.length     = 2 * m.length - (m.length >> 1)
        $temp = $this->_multiply($temp, false, $m, false);

        // at this point, if m had an odd number of digits, we'd be subtracting a 2 * m.length - (m.length >> 1) digit
        // number from a m.length + (m.length >> 1) + 1 digit number.  ie. there'd be an extra digit and the while loop
        // following this comment would loop a lot (hence our calling _regularBarrett() in that situation).

        $result = $this->_subtract($n[MATH_BIGINTEGER_VALUE], false, $temp[MATH_BIGINTEGER_VALUE], false);

        while ($this->_compare($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $m, false) >= 0) {
            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $m, false);
        }

        return $result[MATH_BIGINTEGER_VALUE];
    }

    /**
     * (Regular) Barrett Modular Reduction
     *
     * For numbers with more than four digits Math_BigInteger::_barrett() is faster.  The difference between that and this
     * is that this function does not fold the denominator into a smaller form.
     *
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @return array
     */
    function _regularBarrett($x, $n)
    {
        static $cache = array(
            MATH_BIGINTEGER_VARIABLE => array(),
            MATH_BIGINTEGER_DATA => array()
        );

        $n_length = count($n);

        if (count($x) > 2 * $n_length) {
            $lhs = new Math_BigInteger();
            $rhs = new Math_BigInteger();
            $lhs->value = $x;
            $rhs->value = $n;
            list(, $temp) = $lhs->divide($rhs);
            return $temp->value;
        }

        if (($key = array_search($n, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
            $cache[MATH_BIGINTEGER_VARIABLE][] = $n;
            $lhs = new Math_BigInteger();
            $lhs_value = &$lhs->value;
            $lhs_value = $this->_array_repeat(0, 2 * $n_length);
            $lhs_value[] = 1;
            $rhs = new Math_BigInteger();
            $rhs->value = $n;
            list($temp, ) = $lhs->divide($rhs); // m.length
            $cache[MATH_BIGINTEGER_DATA][] = $temp->value;
        }

        // 2 * m.length - (m.length - 1) = m.length + 1
        $temp = array_slice($x, $n_length - 1);
        // (m.length + 1) + m.length = 2 * m.length + 1
        $temp = $this->_multiply($temp, false, $cache[MATH_BIGINTEGER_DATA][$key], false);
        // (2 * m.length + 1) - (m.length - 1) = m.length + 2
        $temp = array_slice($temp[MATH_BIGINTEGER_VALUE], $n_length + 1);

        // m.length + 1
        $result = array_slice($x, 0, $n_length + 1);
        // m.length + 1
        $temp = $this->_multiplyLower($temp, false, $n, false, $n_length + 1);
        // $temp == array_slice($temp->_multiply($temp, false, $n, false)->value, 0, $n_length + 1)

        if ($this->_compare($result, false, $temp[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_SIGN]) < 0) {
            $corrector_value = $this->_array_repeat(0, $n_length + 1);
            $corrector_value[count($corrector_value)] = 1;
            $result = $this->_add($result, false, $corrector_value, false);
            $result = $result[MATH_BIGINTEGER_VALUE];
        }

        // at this point, we're subtracting a number with m.length + 1 digits from another number with m.length + 1 digits
        $result = $this->_subtract($result, false, $temp[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_SIGN]);
        while ($this->_compare($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $n, false) > 0) {
            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $n, false);
        }

        return $result[MATH_BIGINTEGER_VALUE];
    }

    /**
     * Performs long multiplication up to $stop digits
     *
     * If you're going to be doing array_slice($product->value, 0, $stop), some cycles can be saved.
     *
     * @see self::_regularBarrett()
     * @param array $x_value
     * @param bool $x_negative
     * @param array $y_value
     * @param bool $y_negative
     * @param int $stop
     * @return array
     * @access private
     */
    function _multiplyLower($x_value, $x_negative, $y_value, $y_negative, $stop)
    {
        $x_length = count($x_value);
        $y_length = count($y_value);

        if (!$x_length || !$y_length) { // a 0 is being multiplied
            return array(
                MATH_BIGINTEGER_VALUE => array(),
                MATH_BIGINTEGER_SIGN => false
            );
        }

        if ($x_length < $y_length) {
            $temp = $x_value;
            $x_value = $y_value;
            $y_value = $temp;

            $x_length = count($x_value);
            $y_length = count($y_value);
        }

        $product_value = $this->_array_repeat(0, $x_length + $y_length);

        // the following for loop could be removed if the for loop following it
        // (the one with nested for loops) initially set $i to 0, but
        // doing so would also make the result in one set of unnecessary adds,
        // since on the outermost loops first pass, $product->value[$k] is going
        // to always be 0

        $carry = 0;

        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0, $k = $i
            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
            $product_value[$j] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
        }

        if ($j < $stop) {
            $product_value[$j] = $carry;
        }

        // the above for loop is what the previous comment was talking about.  the
        // following for loop is the "one with nested for loops"

        for ($i = 1; $i < $y_length; ++$i) {
            $carry = 0;

            for ($j = 0, $k = $i; $j < $x_length && $k < $stop; ++$j, ++$k) {
                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
                $product_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
            }

            if ($k < $stop) {
                $product_value[$k] = $carry;
            }
        }

        return array(
            MATH_BIGINTEGER_VALUE => $this->_trim($product_value),
            MATH_BIGINTEGER_SIGN => $x_negative != $y_negative
        );
    }

    /**
     * Montgomery Modular Reduction
     *
     * ($x->_prepMontgomery($n))->_montgomery($n) yields $x % $n.
     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=170 MPM 6.3} provides insights on how this can be
     * improved upon (basically, by using the comba method).  gcd($n, 2) must be equal to one for this function
     * to work correctly.
     *
     * @see self::_prepMontgomery()
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @return array
     */
    function _montgomery($x, $n)
    {
        static $cache = array(
            MATH_BIGINTEGER_VARIABLE => array(),
            MATH_BIGINTEGER_DATA => array()
        );

        if (($key = array_search($n, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
            $cache[MATH_BIGINTEGER_VARIABLE][] = $x;
            $cache[MATH_BIGINTEGER_DATA][] = $this->_modInverse67108864($n);
        }

        $k = count($n);

        $result = array(MATH_BIGINTEGER_VALUE => $x);

        for ($i = 0; $i < $k; ++$i) {
            $temp = $result[MATH_BIGINTEGER_VALUE][$i] * $cache[MATH_BIGINTEGER_DATA][$key];
            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
            $temp = $this->_regularMultiply(array($temp), $n);
            $temp = array_merge($this->_array_repeat(0, $i), $temp);
            $result = $this->_add($result[MATH_BIGINTEGER_VALUE], false, $temp, false);
        }

        $result[MATH_BIGINTEGER_VALUE] = array_slice($result[MATH_BIGINTEGER_VALUE], $k);

        if ($this->_compare($result, false, $n, false) >= 0) {
            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], false, $n, false);
        }

        return $result[MATH_BIGINTEGER_VALUE];
    }

    /**
     * Montgomery Multiply
     *
     * Interleaves the montgomery reduction and long multiplication algorithms together as described in
     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=13 HAC 14.36}
     *
     * @see self::_prepMontgomery()
     * @see self::_montgomery()
     * @access private
     * @param array $x
     * @param array $y
     * @param array $m
     * @return array
     */
    function _montgomeryMultiply($x, $y, $m)
    {
        $temp = $this->_multiply($x, false, $y, false);
        return $this->_montgomery($temp[MATH_BIGINTEGER_VALUE], $m);

        // the following code, although not callable, can be run independently of the above code
        // although the above code performed better in my benchmarks the following could might
        // perform better under different circumstances. in lieu of deleting it it's just been
        // made uncallable

        static $cache = array(
            MATH_BIGINTEGER_VARIABLE => array(),
            MATH_BIGINTEGER_DATA => array()
        );

        if (($key = array_search($m, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
            $cache[MATH_BIGINTEGER_VARIABLE][] = $m;
            $cache[MATH_BIGINTEGER_DATA][] = $this->_modInverse67108864($m);
        }

        $n = max(count($x), count($y), count($m));
        $x = array_pad($x, $n, 0);
        $y = array_pad($y, $n, 0);
        $m = array_pad($m, $n, 0);
        $a = array(MATH_BIGINTEGER_VALUE => $this->_array_repeat(0, $n + 1));
        for ($i = 0; $i < $n; ++$i) {
            $temp = $a[MATH_BIGINTEGER_VALUE][0] + $x[$i] * $y[0];
            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
            $temp = $temp * $cache[MATH_BIGINTEGER_DATA][$key];
            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
            $temp = $this->_add($this->_regularMultiply(array($x[$i]), $y), false, $this->_regularMultiply(array($temp), $m), false);
            $a = $this->_add($a[MATH_BIGINTEGER_VALUE], false, $temp[MATH_BIGINTEGER_VALUE], false);
            $a[MATH_BIGINTEGER_VALUE] = array_slice($a[MATH_BIGINTEGER_VALUE], 1);
        }
        if ($this->_compare($a[MATH_BIGINTEGER_VALUE], false, $m, false) >= 0) {
            $a = $this->_subtract($a[MATH_BIGINTEGER_VALUE], false, $m, false);
        }
        return $a[MATH_BIGINTEGER_VALUE];
    }

    /**
     * Prepare a number for use in Montgomery Modular Reductions
     *
     * @see self::_montgomery()
     * @see self::_slidingWindow()
     * @access private
     * @param array $x
     * @param array $n
     * @return array
     */
    function _prepMontgomery($x, $n)
    {
        $lhs = new Math_BigInteger();
        $lhs->value = array_merge($this->_array_repeat(0, count($n)), $x);
        $rhs = new Math_BigInteger();
        $rhs->value = $n;

        list(, $temp) = $lhs->divide($rhs);
        return $temp->value;
    }

    /**
     * Modular Inverse of a number mod 2**26 (eg. 67108864)
     *
     * Based off of the bnpInvDigit function implemented and justified in the following URL:
     *
     * {@link http://www-cs-students.stanford.edu/~tjw/jsbn/jsbn.js}
     *
     * The following URL provides more info:
     *
     * {@link http://groups.google.com/group/sci.crypt/msg/7a137205c1be7d85}
     *
     * As for why we do all the bitmasking...  strange things can happen when converting from floats to ints. For
     * instance, on some computers, var_dump((int) -4294967297) yields int(-1) and on others, it yields
     * int(-2147483648).  To avoid problems stemming from this, we use bitmasks to guarantee that ints aren't
     * auto-converted to floats.  The outermost bitmask is present because without it, there's no guarantee that
     * the "residue" returned would be the so-called "common residue".  We use fmod, in the last step, because the
     * maximum possible $x is 26 bits and the maximum $result is 16 bits.  Thus, we have to be able to handle up to
     * 40 bits, which only 64-bit floating points will support.
     *
     * Thanks to Pedro Gimeno Fortea for input!
     *
     * @see self::_montgomery()
     * @access private
     * @param array $x
     * @return int
     */
    function _modInverse67108864($x) // 2**26 == 67,108,864
    {
        $x = -$x[0];
        $result = $x & 0x3; // x**-1 mod 2**2
        $result = ($result * (2 - $x * $result)) & 0xF; // x**-1 mod 2**4
        $result = ($result * (2 - ($x & 0xFF) * $result))  & 0xFF; // x**-1 mod 2**8
        $result = ($result * ((2 - ($x & 0xFFFF) * $result) & 0xFFFF)) & 0xFFFF; // x**-1 mod 2**16
        $result = fmod($result * (2 - fmod($x * $result, MATH_BIGINTEGER_BASE_FULL)), MATH_BIGINTEGER_BASE_FULL); // x**-1 mod 2**26
        return $result & MATH_BIGINTEGER_MAX_DIGIT;
    }

    /**
     * Calculates modular inverses.
     *
     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
     *
     * Here's an example:
     * 
     * modInverse($b);
     *    echo $c->toString(); // outputs 4
     *
     *    echo "\r\n";
     *
     *    $d = $a->multiply($c);
     *    list(, $d) = $d->divide($b);
     *    echo $d; // outputs 1 (as per the definition of modular inverse)
     * ?>
     * 
     *
     * @param Math_BigInteger $n
     * @return Math_BigInteger|false
     * @access public
     * @internal See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=21 HAC 14.64} for more information.
     */
    function modInverse($n)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_invert($this->value, $n->value);

                return ($temp->value === false) ? false : $this->_normalize($temp);
        }

        static $zero, $one;
        if (!isset($zero)) {
            $zero = new Math_BigInteger();
            $one = new Math_BigInteger(1);
        }

        // $x mod -$n == $x mod $n.
        $n = $n->abs();

        if ($this->compare($zero) < 0) {
            $temp = $this->abs();
            $temp = $temp->modInverse($n);
            return $this->_normalize($n->subtract($temp));
        }

        extract($this->extendedGCD($n));

        if (!$gcd->equals($one)) {
            return false;
        }

        $x = $x->compare($zero) < 0 ? $x->add($n) : $x;

        return $this->compare($zero) < 0 ? $this->_normalize($n->subtract($x)) : $this->_normalize($x);
    }

    /**
     * Calculates the greatest common divisor and Bezout's identity.
     *
     * Say you have 693 and 609.  The GCD is 21.  Bezout's identity states that there exist integers x and y such that
     * 693*x + 609*y == 21.  In point of fact, there are actually an infinite number of x and y combinations and which
     * combination is returned is dependent upon which mode is in use.  See
     * {@link http://en.wikipedia.org/wiki/B%C3%A9zout%27s_identity Bezout's identity - Wikipedia} for more information.
     *
     * Here's an example:
     * 
     * extendedGCD($b));
     *
     *    echo $gcd->toString() . "\r\n"; // outputs 21
     *    echo $a->toString() * $x->toString() + $b->toString() * $y->toString(); // outputs 21
     * ?>
     * 
     *
     * @param Math_BigInteger $n
     * @return Math_BigInteger
     * @access public
     * @internal Calculates the GCD using the binary xGCD algorithim described in
     *    {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=19 HAC 14.61}.  As the text above 14.61 notes,
     *    the more traditional algorithim requires "relatively costly multiple-precision divisions".
     */
    function extendedGCD($n)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                extract(gmp_gcdext($this->value, $n->value));

                return array(
                    'gcd' => $this->_normalize(new Math_BigInteger($g)),
                    'x'   => $this->_normalize(new Math_BigInteger($s)),
                    'y'   => $this->_normalize(new Math_BigInteger($t))
                );
            case MATH_BIGINTEGER_MODE_BCMATH:
                // it might be faster to use the binary xGCD algorithim here, as well, but (1) that algorithim works
                // best when the base is a power of 2 and (2) i don't think it'd make much difference, anyway.  as is,
                // the basic extended euclidean algorithim is what we're using.

                $u = $this->value;
                $v = $n->value;

                $a = '1';
                $b = '0';
                $c = '0';
                $d = '1';

                while (bccomp($v, '0', 0) != 0) {
                    $q = bcdiv($u, $v, 0);

                    $temp = $u;
                    $u = $v;
                    $v = bcsub($temp, bcmul($v, $q, 0), 0);

                    $temp = $a;
                    $a = $c;
                    $c = bcsub($temp, bcmul($a, $q, 0), 0);

                    $temp = $b;
                    $b = $d;
                    $d = bcsub($temp, bcmul($b, $q, 0), 0);
                }

                return array(
                    'gcd' => $this->_normalize(new Math_BigInteger($u)),
                    'x'   => $this->_normalize(new Math_BigInteger($a)),
                    'y'   => $this->_normalize(new Math_BigInteger($b))
                );
        }

        $y = $n->copy();
        $x = $this->copy();
        $g = new Math_BigInteger();
        $g->value = array(1);

        while (!(($x->value[0] & 1)|| ($y->value[0] & 1))) {
            $x->_rshift(1);
            $y->_rshift(1);
            $g->_lshift(1);
        }

        $u = $x->copy();
        $v = $y->copy();

        $a = new Math_BigInteger();
        $b = new Math_BigInteger();
        $c = new Math_BigInteger();
        $d = new Math_BigInteger();

        $a->value = $d->value = $g->value = array(1);
        $b->value = $c->value = array();

        while (!empty($u->value)) {
            while (!($u->value[0] & 1)) {
                $u->_rshift(1);
                if ((!empty($a->value) && ($a->value[0] & 1)) || (!empty($b->value) && ($b->value[0] & 1))) {
                    $a = $a->add($y);
                    $b = $b->subtract($x);
                }
                $a->_rshift(1);
                $b->_rshift(1);
            }

            while (!($v->value[0] & 1)) {
                $v->_rshift(1);
                if ((!empty($d->value) && ($d->value[0] & 1)) || (!empty($c->value) && ($c->value[0] & 1))) {
                    $c = $c->add($y);
                    $d = $d->subtract($x);
                }
                $c->_rshift(1);
                $d->_rshift(1);
            }

            if ($u->compare($v) >= 0) {
                $u = $u->subtract($v);
                $a = $a->subtract($c);
                $b = $b->subtract($d);
            } else {
                $v = $v->subtract($u);
                $c = $c->subtract($a);
                $d = $d->subtract($b);
            }
        }

        return array(
            'gcd' => $this->_normalize($g->multiply($v)),
            'x'   => $this->_normalize($c),
            'y'   => $this->_normalize($d)
        );
    }

    /**
     * Calculates the greatest common divisor
     *
     * Say you have 693 and 609.  The GCD is 21.
     *
     * Here's an example:
     * 
     * extendedGCD($b);
     *
     *    echo $gcd->toString() . "\r\n"; // outputs 21
     * ?>
     * 
     *
     * @param Math_BigInteger $n
     * @return Math_BigInteger
     * @access public
     */
    function gcd($n)
    {
        extract($this->extendedGCD($n));
        return $gcd;
    }

    /**
     * Absolute value.
     *
     * @return Math_BigInteger
     * @access public
     */
    function abs()
    {
        $temp = new Math_BigInteger();

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp->value = gmp_abs($this->value);
                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp->value = (bccomp($this->value, '0', 0) < 0) ? substr($this->value, 1) : $this->value;
                break;
            default:
                $temp->value = $this->value;
        }

        return $temp;
    }

    /**
     * Compares two numbers.
     *
     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this is
     * demonstrated thusly:
     *
     * $x  > $y: $x->compare($y)  > 0
     * $x  < $y: $x->compare($y)  < 0
     * $x == $y: $x->compare($y) == 0
     *
     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
     *
     * @param Math_BigInteger $y
     * @return int < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
     * @access public
     * @see self::equals()
     * @internal Could return $this->subtract($x), but that's not as fast as what we do do.
     */
    function compare($y)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $r = gmp_cmp($this->value, $y->value);
                if ($r < -1) {
                    $r = -1;
                }
                if ($r > 1) {
                    $r = 1;
                }
                return $r;
            case MATH_BIGINTEGER_MODE_BCMATH:
                return bccomp($this->value, $y->value, 0);
        }

        return $this->_compare($this->value, $this->is_negative, $y->value, $y->is_negative);
    }

    /**
     * Compares two numbers.
     *
     * @param array $x_value
     * @param bool $x_negative
     * @param array $y_value
     * @param bool $y_negative
     * @return int
     * @see self::compare()
     * @access private
     */
    function _compare($x_value, $x_negative, $y_value, $y_negative)
    {
        if ($x_negative != $y_negative) {
            return (!$x_negative && $y_negative) ? 1 : -1;
        }

        $result = $x_negative ? -1 : 1;

        if (count($x_value) != count($y_value)) {
            return (count($x_value) > count($y_value)) ? $result : -$result;
        }
        $size = max(count($x_value), count($y_value));

        $x_value = array_pad($x_value, $size, 0);
        $y_value = array_pad($y_value, $size, 0);

        for ($i = count($x_value) - 1; $i >= 0; --$i) {
            if ($x_value[$i] != $y_value[$i]) {
                return ($x_value[$i] > $y_value[$i]) ? $result : -$result;
            }
        }

        return 0;
    }

    /**
     * Tests the equality of two numbers.
     *
     * If you need to see if one number is greater than or less than another number, use Math_BigInteger::compare()
     *
     * @param Math_BigInteger $x
     * @return bool
     * @access public
     * @see self::compare()
     */
    function equals($x)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                return gmp_cmp($this->value, $x->value) == 0;
            default:
                return $this->value === $x->value && $this->is_negative == $x->is_negative;
        }
    }

    /**
     * Set Precision
     *
     * Some bitwise operations give different results depending on the precision being used.  Examples include left
     * shift, not, and rotates.
     *
     * @param int $bits
     * @access public
     */
    function setPrecision($bits)
    {
        $this->precision = $bits;
        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_BCMATH) {
            $this->bitmask = new Math_BigInteger(chr((1 << ($bits & 0x7)) - 1) . str_repeat(chr(0xFF), $bits >> 3), 256);
        } else {
            $this->bitmask = new Math_BigInteger(bcpow('2', $bits, 0));
        }

        $temp = $this->_normalize($this);
        $this->value = $temp->value;
    }

    /**
     * Logical And
     *
     * @param Math_BigInteger $x
     * @access public
     * @internal Implemented per a request by Lluis Pamies i Juarez 
     * @return Math_BigInteger
     */
    function bitwise_and($x)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_and($this->value, $x->value);

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $left = $this->toBytes();
                $right = $x->toBytes();

                $length = max(strlen($left), strlen($right));

                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);

                return $this->_normalize(new Math_BigInteger($left & $right, 256));
        }

        $result = $this->copy();

        $length = min(count($x->value), count($this->value));

        $result->value = array_slice($result->value, 0, $length);

        for ($i = 0; $i < $length; ++$i) {
            $result->value[$i]&= $x->value[$i];
        }

        return $this->_normalize($result);
    }

    /**
     * Logical Or
     *
     * @param Math_BigInteger $x
     * @access public
     * @internal Implemented per a request by Lluis Pamies i Juarez 
     * @return Math_BigInteger
     */
    function bitwise_or($x)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_or($this->value, $x->value);

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $left = $this->toBytes();
                $right = $x->toBytes();

                $length = max(strlen($left), strlen($right));

                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);

                return $this->_normalize(new Math_BigInteger($left | $right, 256));
        }

        $length = max(count($this->value), count($x->value));
        $result = $this->copy();
        $result->value = array_pad($result->value, $length, 0);
        $x->value = array_pad($x->value, $length, 0);

        for ($i = 0; $i < $length; ++$i) {
            $result->value[$i]|= $x->value[$i];
        }

        return $this->_normalize($result);
    }

    /**
     * Logical Exclusive-Or
     *
     * @param Math_BigInteger $x
     * @access public
     * @internal Implemented per a request by Lluis Pamies i Juarez 
     * @return Math_BigInteger
     */
    function bitwise_xor($x)
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                $temp = new Math_BigInteger();
                $temp->value = gmp_xor(gmp_abs($this->value), gmp_abs($x->value));

                return $this->_normalize($temp);
            case MATH_BIGINTEGER_MODE_BCMATH:
                $left = $this->toBytes();
                $right = $x->toBytes();

                $length = max(strlen($left), strlen($right));

                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);

                return $this->_normalize(new Math_BigInteger($left ^ $right, 256));
        }

        $length = max(count($this->value), count($x->value));
        $result = $this->copy();
        $result->is_negative = false;
        $result->value = array_pad($result->value, $length, 0);
        $x->value = array_pad($x->value, $length, 0);

        for ($i = 0; $i < $length; ++$i) {
            $result->value[$i]^= $x->value[$i];
        }

        return $this->_normalize($result);
    }

    /**
     * Logical Not
     *
     * @access public
     * @internal Implemented per a request by Lluis Pamies i Juarez 
     * @return Math_BigInteger
     */
    function bitwise_not()
    {
        // calculuate "not" without regard to $this->precision
        // (will always result in a smaller number.  ie. ~1 isn't 1111 1110 - it's 0)
        $temp = $this->toBytes();
        if ($temp == '') {
            return $this->_normalize(new Math_BigInteger());
        }
        $pre_msb = decbin(ord($temp[0]));
        $temp = ~$temp;
        $msb = decbin(ord($temp[0]));
        if (strlen($msb) == 8) {
            $msb = substr($msb, strpos($msb, '0'));
        }
        $temp[0] = chr(bindec($msb));

        // see if we need to add extra leading 1's
        $current_bits = strlen($pre_msb) + 8 * strlen($temp) - 8;
        $new_bits = $this->precision - $current_bits;
        if ($new_bits <= 0) {
            return $this->_normalize(new Math_BigInteger($temp, 256));
        }

        // generate as many leading 1's as we need to.
        $leading_ones = chr((1 << ($new_bits & 0x7)) - 1) . str_repeat(chr(0xFF), $new_bits >> 3);
        $this->_base256_lshift($leading_ones, $current_bits);

        $temp = str_pad($temp, strlen($leading_ones), chr(0), STR_PAD_LEFT);

        return $this->_normalize(new Math_BigInteger($leading_ones | $temp, 256));
    }

    /**
     * Logical Right Shift
     *
     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
     *
     * @param int $shift
     * @return Math_BigInteger
     * @access public
     * @internal The only version that yields any speed increases is the internal version.
     */
    function bitwise_rightShift($shift)
    {
        $temp = new Math_BigInteger();

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                static $two;

                if (!isset($two)) {
                    $two = gmp_init('2');
                }

                $temp->value = gmp_div_q($this->value, gmp_pow($two, $shift));

                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp->value = bcdiv($this->value, bcpow('2', $shift, 0), 0);

                break;
            default: // could just replace _lshift with this, but then all _lshift() calls would need to be rewritten
                     // and I don't want to do that...
                $temp->value = $this->value;
                $temp->_rshift($shift);
        }

        return $this->_normalize($temp);
    }

    /**
     * Logical Left Shift
     *
     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
     *
     * @param int $shift
     * @return Math_BigInteger
     * @access public
     * @internal The only version that yields any speed increases is the internal version.
     */
    function bitwise_leftShift($shift)
    {
        $temp = new Math_BigInteger();

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                static $two;

                if (!isset($two)) {
                    $two = gmp_init('2');
                }

                $temp->value = gmp_mul($this->value, gmp_pow($two, $shift));

                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                $temp->value = bcmul($this->value, bcpow('2', $shift, 0), 0);

                break;
            default: // could just replace _rshift with this, but then all _lshift() calls would need to be rewritten
                     // and I don't want to do that...
                $temp->value = $this->value;
                $temp->_lshift($shift);
        }

        return $this->_normalize($temp);
    }

    /**
     * Logical Left Rotate
     *
     * Instead of the top x bits being dropped they're appended to the shifted bit string.
     *
     * @param int $shift
     * @return Math_BigInteger
     * @access public
     */
    function bitwise_leftRotate($shift)
    {
        $bits = $this->toBytes();

        if ($this->precision > 0) {
            $precision = $this->precision;
            if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
                $mask = $this->bitmask->subtract(new Math_BigInteger(1));
                $mask = $mask->toBytes();
            } else {
                $mask = $this->bitmask->toBytes();
            }
        } else {
            $temp = ord($bits[0]);
            for ($i = 0; $temp >> $i; ++$i) {
            }
            $precision = 8 * strlen($bits) - 8 + $i;
            $mask = chr((1 << ($precision & 0x7)) - 1) . str_repeat(chr(0xFF), $precision >> 3);
        }

        if ($shift < 0) {
            $shift+= $precision;
        }
        $shift%= $precision;

        if (!$shift) {
            return $this->copy();
        }

        $left = $this->bitwise_leftShift($shift);
        $left = $left->bitwise_and(new Math_BigInteger($mask, 256));
        $right = $this->bitwise_rightShift($precision - $shift);
        $result = MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_BCMATH ? $left->bitwise_or($right) : $left->add($right);
        return $this->_normalize($result);
    }

    /**
     * Logical Right Rotate
     *
     * Instead of the bottom x bits being dropped they're prepended to the shifted bit string.
     *
     * @param int $shift
     * @return Math_BigInteger
     * @access public
     */
    function bitwise_rightRotate($shift)
    {
        return $this->bitwise_leftRotate(-$shift);
    }

    /**
     * Set random number generator function
     *
     * This function is deprecated.
     *
     * @param string $generator
     * @access public
     */
    function setRandomGenerator($generator)
    {
    }

    /**
     * Generates a random BigInteger
     *
     * Byte length is equal to $length. Uses crypt_random if it's loaded and mt_rand if it's not.
     *
     * @param int $length
     * @return Math_BigInteger
     * @access private
     */
    function _random_number_helper($size)
    {
        if (function_exists('crypt_random_string')) {
            $random = crypt_random_string($size);
        } else {
            $random = '';

            if ($size & 1) {
                $random.= chr(mt_rand(0, 255));
            }

            $blocks = $size >> 1;
            for ($i = 0; $i < $blocks; ++$i) {
                // mt_rand(-2147483648, 0x7FFFFFFF) always produces -2147483648 on some systems
                $random.= pack('n', mt_rand(0, 0xFFFF));
            }
        }

        return new Math_BigInteger($random, 256);
    }

    /**
     * Generate a random number
     *
     * Returns a random number between $min and $max where $min and $max
     * can be defined using one of the two methods:
     *
     * $min->random($max)
     * $max->random($min)
     *
     * @param Math_BigInteger $arg1
     * @param Math_BigInteger $arg2
     * @return Math_BigInteger
     * @access public
     * @internal The API for creating random numbers used to be $a->random($min, $max), where $a was a Math_BigInteger object.
     *           That method is still supported for BC purposes.
     */
    function random($arg1, $arg2 = false)
    {
        if ($arg1 === false) {
            return false;
        }

        if ($arg2 === false) {
            $max = $arg1;
            $min = $this;
        } else {
            $min = $arg1;
            $max = $arg2;
        }

        $compare = $max->compare($min);

        if (!$compare) {
            return $this->_normalize($min);
        } elseif ($compare < 0) {
            // if $min is bigger then $max, swap $min and $max
            $temp = $max;
            $max = $min;
            $min = $temp;
        }

        static $one;
        if (!isset($one)) {
            $one = new Math_BigInteger(1);
        }

        $max = $max->subtract($min->subtract($one));
        $size = strlen(ltrim($max->toBytes(), chr(0)));

        /*
            doing $random % $max doesn't work because some numbers will be more likely to occur than others.
            eg. if $max is 140 and $random's max is 255 then that'd mean both $random = 5 and $random = 145
            would produce 5 whereas the only value of random that could produce 139 would be 139. ie.
            not all numbers would be equally likely. some would be more likely than others.

            creating a whole new random number until you find one that is within the range doesn't work
            because, for sufficiently small ranges, the likelihood that you'd get a number within that range
            would be pretty small. eg. with $random's max being 255 and if your $max being 1 the probability
            would be pretty high that $random would be greater than $max.

            phpseclib works around this using the technique described here:

            http://crypto.stackexchange.com/questions/5708/creating-a-small-number-from-a-cryptographically-secure-random-string
        */
        $random_max = new Math_BigInteger(chr(1) . str_repeat("\0", $size), 256);
        $random = $this->_random_number_helper($size);

        list($max_multiple) = $random_max->divide($max);
        $max_multiple = $max_multiple->multiply($max);

        while ($random->compare($max_multiple) >= 0) {
            $random = $random->subtract($max_multiple);
            $random_max = $random_max->subtract($max_multiple);
            $random = $random->bitwise_leftShift(8);
            $random = $random->add($this->_random_number_helper(1));
            $random_max = $random_max->bitwise_leftShift(8);
            list($max_multiple) = $random_max->divide($max);
            $max_multiple = $max_multiple->multiply($max);
        }
        list(, $random) = $random->divide($max);

        return $this->_normalize($random->add($min));
    }

    /**
     * Generate a random prime number.
     *
     * If there's not a prime within the given range, false will be returned.
     * If more than $timeout seconds have elapsed, give up and return false.
     *
     * @param Math_BigInteger $arg1
     * @param Math_BigInteger $arg2
     * @param int $timeout
     * @return Math_BigInteger|false
     * @access public
     * @internal See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap4.pdf#page=15 HAC 4.44}.
     */
    function randomPrime($arg1, $arg2 = false, $timeout = false)
    {
        if ($arg1 === false) {
            return false;
        }

        if ($arg2 === false) {
            $max = $arg1;
            $min = $this;
        } else {
            $min = $arg1;
            $max = $arg2;
        }

        $compare = $max->compare($min);

        if (!$compare) {
            return $min->isPrime() ? $min : false;
        } elseif ($compare < 0) {
            // if $min is bigger then $max, swap $min and $max
            $temp = $max;
            $max = $min;
            $min = $temp;
        }

        static $one, $two;
        if (!isset($one)) {
            $one = new Math_BigInteger(1);
            $two = new Math_BigInteger(2);
        }

        $start = time();

        $x = $this->random($min, $max);

        // gmp_nextprime() requires PHP 5 >= 5.2.0 per .
        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_GMP && extension_loaded('gmp') && version_compare(PHP_VERSION, '5.2.0', '>=')) {
            $p = new Math_BigInteger();
            $p->value = gmp_nextprime($x->value);

            if ($p->compare($max) <= 0) {
                return $p;
            }

            if (!$min->equals($x)) {
                $x = $x->subtract($one);
            }

            return $x->randomPrime($min, $x);
        }

        if ($x->equals($two)) {
            return $x;
        }

        $x->_make_odd();
        if ($x->compare($max) > 0) {
            // if $x > $max then $max is even and if $min == $max then no prime number exists between the specified range
            if ($min->equals($max)) {
                return false;
            }
            $x = $min->copy();
            $x->_make_odd();
        }

        $initial_x = $x->copy();

        while (true) {
            if ($timeout !== false && time() - $start > $timeout) {
                return false;
            }

            if ($x->isPrime()) {
                return $x;
            }

            $x = $x->add($two);

            if ($x->compare($max) > 0) {
                $x = $min->copy();
                if ($x->equals($two)) {
                    return $x;
                }
                $x->_make_odd();
            }

            if ($x->equals($initial_x)) {
                return false;
            }
        }
    }

    /**
     * Make the current number odd
     *
     * If the current number is odd it'll be unchanged.  If it's even, one will be added to it.
     *
     * @see self::randomPrime()
     * @access private
     */
    function _make_odd()
    {
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                gmp_setbit($this->value, 0);
                break;
            case MATH_BIGINTEGER_MODE_BCMATH:
                if ($this->value[strlen($this->value) - 1] % 2 == 0) {
                    $this->value = bcadd($this->value, '1');
                }
                break;
            default:
                $this->value[0] |= 1;
        }
    }

    /**
     * Checks a numer to see if it's prime
     *
     * Assuming the $t parameter is not set, this function has an error rate of 2**-80.  The main motivation for the
     * $t parameter is distributability.  Math_BigInteger::randomPrime() can be distributed across multiple pageloads
     * on a website instead of just one.
     *
     * @param Math_BigInteger $t
     * @return bool
     * @access public
     * @internal Uses the
     *     {@link http://en.wikipedia.org/wiki/Miller%E2%80%93Rabin_primality_test Miller-Rabin primality test}.  See
     *     {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap4.pdf#page=8 HAC 4.24}.
     */
    function isPrime($t = false)
    {
        $length = strlen($this->toBytes());

        if (!$t) {
            // see HAC 4.49 "Note (controlling the error probability)"
            // @codingStandardsIgnoreStart
                 if ($length >= 163) { $t =  2; } // floor(1300 / 8)
            else if ($length >= 106) { $t =  3; } // floor( 850 / 8)
            else if ($length >= 81 ) { $t =  4; } // floor( 650 / 8)
            else if ($length >= 68 ) { $t =  5; } // floor( 550 / 8)
            else if ($length >= 56 ) { $t =  6; } // floor( 450 / 8)
            else if ($length >= 50 ) { $t =  7; } // floor( 400 / 8)
            else if ($length >= 43 ) { $t =  8; } // floor( 350 / 8)
            else if ($length >= 37 ) { $t =  9; } // floor( 300 / 8)
            else if ($length >= 31 ) { $t = 12; } // floor( 250 / 8)
            else if ($length >= 25 ) { $t = 15; } // floor( 200 / 8)
            else if ($length >= 18 ) { $t = 18; } // floor( 150 / 8)
            else                     { $t = 27; }
            // @codingStandardsIgnoreEnd
        }

        // ie. gmp_testbit($this, 0)
        // ie. isEven() or !isOdd()
        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                return gmp_prob_prime($this->value, $t) != 0;
            case MATH_BIGINTEGER_MODE_BCMATH:
                if ($this->value === '2') {
                    return true;
                }
                if ($this->value[strlen($this->value) - 1] % 2 == 0) {
                    return false;
                }
                break;
            default:
                if ($this->value == array(2)) {
                    return true;
                }
                if (~$this->value[0] & 1) {
                    return false;
                }
        }

        static $primes, $zero, $one, $two;

        if (!isset($primes)) {
            $primes = array(
                3,    5,    7,    11,   13,   17,   19,   23,   29,   31,   37,   41,   43,   47,   53,   59,
                61,   67,   71,   73,   79,   83,   89,   97,   101,  103,  107,  109,  113,  127,  131,  137,
                139,  149,  151,  157,  163,  167,  173,  179,  181,  191,  193,  197,  199,  211,  223,  227,
                229,  233,  239,  241,  251,  257,  263,  269,  271,  277,  281,  283,  293,  307,  311,  313,
                317,  331,  337,  347,  349,  353,  359,  367,  373,  379,  383,  389,  397,  401,  409,  419,
                421,  431,  433,  439,  443,  449,  457,  461,  463,  467,  479,  487,  491,  499,  503,  509,
                521,  523,  541,  547,  557,  563,  569,  571,  577,  587,  593,  599,  601,  607,  613,  617,
                619,  631,  641,  643,  647,  653,  659,  661,  673,  677,  683,  691,  701,  709,  719,  727,
                733,  739,  743,  751,  757,  761,  769,  773,  787,  797,  809,  811,  821,  823,  827,  829,
                839,  853,  857,  859,  863,  877,  881,  883,  887,  907,  911,  919,  929,  937,  941,  947,
                953,  967,  971,  977,  983,  991,  997
            );

            if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
                for ($i = 0; $i < count($primes); ++$i) {
                    $primes[$i] = new Math_BigInteger($primes[$i]);
                }
            }

            $zero = new Math_BigInteger();
            $one = new Math_BigInteger(1);
            $two = new Math_BigInteger(2);
        }

        if ($this->equals($one)) {
            return false;
        }

        // see HAC 4.4.1 "Random search for probable primes"
        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
            foreach ($primes as $prime) {
                list(, $r) = $this->divide($prime);
                if ($r->equals($zero)) {
                    return $this->equals($prime);
                }
            }
        } else {
            $value = $this->value;
            foreach ($primes as $prime) {
                list(, $r) = $this->_divide_digit($value, $prime);
                if (!$r) {
                    return count($value) == 1 && $value[0] == $prime;
                }
            }
        }

        $n   = $this->copy();
        $n_1 = $n->subtract($one);
        $n_2 = $n->subtract($two);

        $r = $n_1->copy();
        $r_value = $r->value;
        // ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
            $s = 0;
            // if $n was 1, $r would be 0 and this would be an infinite loop, hence our $this->equals($one) check earlier
            while ($r->value[strlen($r->value) - 1] % 2 == 0) {
                $r->value = bcdiv($r->value, '2', 0);
                ++$s;
            }
        } else {
            for ($i = 0, $r_length = count($r_value); $i < $r_length; ++$i) {
                $temp = ~$r_value[$i] & 0xFFFFFF;
                for ($j = 1; ($temp >> $j) & 1; ++$j) {
                }
                if ($j != 25) {
                    break;
                }
            }
            $s = 26 * $i + $j;
            $r->_rshift($s);
        }

        for ($i = 0; $i < $t; ++$i) {
            $a = $this->random($two, $n_2);
            $y = $a->modPow($r, $n);

            if (!$y->equals($one) && !$y->equals($n_1)) {
                for ($j = 1; $j < $s && !$y->equals($n_1); ++$j) {
                    $y = $y->modPow($two, $n);
                    if ($y->equals($one)) {
                        return false;
                    }
                }

                if (!$y->equals($n_1)) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * Logical Left Shift
     *
     * Shifts BigInteger's by $shift bits.
     *
     * @param int $shift
     * @access private
     */
    function _lshift($shift)
    {
        if ($shift == 0) {
            return;
        }

        $num_digits = (int) ($shift / MATH_BIGINTEGER_BASE);
        $shift %= MATH_BIGINTEGER_BASE;
        $shift = 1 << $shift;

        $carry = 0;

        for ($i = 0; $i < count($this->value); ++$i) {
            $temp = $this->value[$i] * $shift + $carry;
            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
            $this->value[$i] = (int) ($temp - $carry * MATH_BIGINTEGER_BASE_FULL);
        }

        if ($carry) {
            $this->value[count($this->value)] = $carry;
        }

        while ($num_digits--) {
            array_unshift($this->value, 0);
        }
    }

    /**
     * Logical Right Shift
     *
     * Shifts BigInteger's by $shift bits.
     *
     * @param int $shift
     * @access private
     */
    function _rshift($shift)
    {
        if ($shift == 0) {
            return;
        }

        $num_digits = (int) ($shift / MATH_BIGINTEGER_BASE);
        $shift %= MATH_BIGINTEGER_BASE;
        $carry_shift = MATH_BIGINTEGER_BASE - $shift;
        $carry_mask = (1 << $shift) - 1;

        if ($num_digits) {
            $this->value = array_slice($this->value, $num_digits);
        }

        $carry = 0;

        for ($i = count($this->value) - 1; $i >= 0; --$i) {
            $temp = $this->value[$i] >> $shift | $carry;
            $carry = ($this->value[$i] & $carry_mask) << $carry_shift;
            $this->value[$i] = $temp;
        }

        $this->value = $this->_trim($this->value);
    }

    /**
     * Normalize
     *
     * Removes leading zeros and truncates (if necessary) to maintain the appropriate precision
     *
     * @param Math_BigInteger
     * @return Math_BigInteger
     * @see self::_trim()
     * @access private
     */
    function _normalize($result)
    {
        $result->precision = $this->precision;
        $result->bitmask = $this->bitmask;

        switch (MATH_BIGINTEGER_MODE) {
            case MATH_BIGINTEGER_MODE_GMP:
                if ($this->bitmask !== false) {
                    $flip = gmp_cmp($result->value, gmp_init(0)) < 0;
                    if ($flip) {
                        $result->value = gmp_neg($result->value);
                    }
                    $result->value = gmp_and($result->value, $result->bitmask->value);
                    if ($flip) {
                        $result->value = gmp_neg($result->value);
                    }
                }

                return $result;
            case MATH_BIGINTEGER_MODE_BCMATH:
                if (!empty($result->bitmask->value)) {
                    $result->value = bcmod($result->value, $result->bitmask->value);
                }

                return $result;
        }

        $value = &$result->value;

        if (!count($value)) {
            $result->is_negative = false;
            return $result;
        }

        $value = $this->_trim($value);

        if (!empty($result->bitmask->value)) {
            $length = min(count($value), count($this->bitmask->value));
            $value = array_slice($value, 0, $length);

            for ($i = 0; $i < $length; ++$i) {
                $value[$i] = $value[$i] & $this->bitmask->value[$i];
            }
        }

        return $result;
    }

    /**
     * Trim
     *
     * Removes leading zeros
     *
     * @param array $value
     * @return Math_BigInteger
     * @access private
     */
    function _trim($value)
    {
        for ($i = count($value) - 1; $i >= 0; --$i) {
            if ($value[$i]) {
                break;
            }
            unset($value[$i]);
        }

        return $value;
    }

    /**
     * Array Repeat
     *
     * @param $input Array
     * @param $multiplier mixed
     * @return array
     * @access private
     */
    function _array_repeat($input, $multiplier)
    {
        return ($multiplier) ? array_fill(0, $multiplier, $input) : array();
    }

    /**
     * Logical Left Shift
     *
     * Shifts binary strings $shift bits, essentially multiplying by 2**$shift.
     *
     * @param $x String
     * @param $shift Integer
     * @return string
     * @access private
     */
    function _base256_lshift(&$x, $shift)
    {
        if ($shift == 0) {
            return;
        }

        $num_bytes = $shift >> 3; // eg. floor($shift/8)
        $shift &= 7; // eg. $shift % 8

        $carry = 0;
        for ($i = strlen($x) - 1; $i >= 0; --$i) {
            $temp = ord($x[$i]) << $shift | $carry;
            $x[$i] = chr($temp);
            $carry = $temp >> 8;
        }
        $carry = ($carry != 0) ? chr($carry) : '';
        $x = $carry . $x . str_repeat(chr(0), $num_bytes);
    }

    /**
     * Logical Right Shift
     *
     * Shifts binary strings $shift bits, essentially dividing by 2**$shift and returning the remainder.
     *
     * @param $x String
     * @param $shift Integer
     * @return string
     * @access private
     */
    function _base256_rshift(&$x, $shift)
    {
        if ($shift == 0) {
            $x = ltrim($x, chr(0));
            return '';
        }

        $num_bytes = $shift >> 3; // eg. floor($shift/8)
        $shift &= 7; // eg. $shift % 8

        $remainder = '';
        if ($num_bytes) {
            $start = $num_bytes > strlen($x) ? -strlen($x) : -$num_bytes;
            $remainder = substr($x, $start);
            $x = substr($x, 0, -$num_bytes);
        }

        $carry = 0;
        $carry_shift = 8 - $shift;
        for ($i = 0; $i < strlen($x); ++$i) {
            $temp = (ord($x[$i]) >> $shift) | $carry;
            $carry = (ord($x[$i]) << $carry_shift) & 0xFF;
            $x[$i] = chr($temp);
        }
        $x = ltrim($x, chr(0));

        $remainder = chr($carry >> $carry_shift) . $remainder;

        return ltrim($remainder, chr(0));
    }

    // one quirk about how the following functions are implemented is that PHP defines N to be an unsigned long
    // at 32-bits, while java's longs are 64-bits.

    /**
     * Converts 32-bit integers to bytes.
     *
     * @param int $x
     * @return string
     * @access private
     */
    function _int2bytes($x)
    {
        return ltrim(pack('N', $x), chr(0));
    }

    /**
     * Converts bytes to 32-bit integers
     *
     * @param string $x
     * @return int
     * @access private
     */
    function _bytes2int($x)
    {
        $temp = unpack('Nint', str_pad($x, 4, chr(0), STR_PAD_LEFT));
        return $temp['int'];
    }

    /**
     * DER-encode an integer
     *
     * The ability to DER-encode integers is needed to create RSA public keys for use with OpenSSL
     *
     * @see self::modPow()
     * @access private
     * @param int $length
     * @return string
     */
    function _encodeASN1Length($length)
    {
        if ($length <= 0x7F) {
            return chr($length);
        }

        $temp = ltrim(pack('N', $length), chr(0));
        return pack('Ca*', 0x80 | strlen($temp), $temp);
    }

    /**
     * Single digit division
     *
     * Even if int64 is being used the division operator will return a float64 value
     * if the dividend is not evenly divisible by the divisor. Since a float64 doesn't
     * have the precision of int64 this is a problem so, when int64 is being used,
     * we'll guarantee that the dividend is divisible by first subtracting the remainder.
     *
     * @access private
     * @param int $x
     * @param int $y
     * @return int
     */
    function _safe_divide($x, $y)
    {
        if (MATH_BIGINTEGER_BASE === 26) {
            return (int) ($x / $y);
        }

        // MATH_BIGINTEGER_BASE === 31
        return ($x - ($x % $y)) / $y;
    }
}
phpseclib-1.0.18/phpseclib/Net/000077500000000000000000000000001354156543400162635ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/Net/SCP.php000066400000000000000000000243401354156543400174240ustar00rootroot00000000000000
 * login('username', 'password')) {
 *        exit('bad login');
 *    }
 *
 *    $scp = new Net_SCP($ssh);
 *    $scp->put('abcd', str_repeat('x', 1024*1024));
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Net
 * @package   Net_SCP
 * @author    Jim Wigginton 
 * @copyright 2010 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * @access public
 * @see self::put()
 */
/**
 * Reads data from a local file.
 */
define('NET_SCP_LOCAL_FILE', 1);
/**
 * Reads data from a string.
 */
define('NET_SCP_STRING',  2);
/**#@-*/

/**#@+
 * @access private
 * @see self::_send()
 * @see self::_receive()
 */
/**
 * SSH1 is being used.
 */
define('NET_SCP_SSH1', 1);
/**
 * SSH2 is being used.
 */
define('NET_SCP_SSH2',  2);
/**#@-*/

/**
 * Pure-PHP implementations of SCP.
 *
 * @package Net_SCP
 * @author  Jim Wigginton 
 * @access  public
 */
class Net_SCP
{
    /**
     * SSH Object
     *
     * @var object
     * @access private
     */
    var $ssh;

    /**
     * Packet Size
     *
     * @var int
     * @access private
     */
    var $packet_size;

    /**
     * Mode
     *
     * @var int
     * @access private
     */
    var $mode;

    /**
     * Default Constructor.
     *
     * Connects to an SSH server
     *
     * @param Net_SSH1|Net_SSH2 $ssh
     * @return Net_SCP
     * @access public
     */
    function __construct($ssh)
    {
        if (!is_object($ssh)) {
            return;
        }

        switch (strtolower(get_class($ssh))) {
            case 'net_ssh2':
                $this->mode = NET_SCP_SSH2;
                break;
            case 'net_ssh1':
                $this->packet_size = 50000;
                $this->mode = NET_SCP_SSH1;
                break;
            default:
                return;
        }

        $this->ssh = $ssh;
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param Net_SSH1|Net_SSH2 $ssh
     * @access public
     */
    function Net_SCP($ssh)
    {
        $this->__construct($ssh);
    }

    /**
     * Uploads a file to the SCP server.
     *
     * By default, Net_SCP::put() does not read from the local filesystem.  $data is dumped directly into $remote_file.
     * So, for example, if you set $data to 'filename.ext' and then do Net_SCP::get(), you will get a file, twelve bytes
     * long, containing 'filename.ext' as its contents.
     *
     * Setting $mode to NET_SCP_LOCAL_FILE will change the above behavior.  With NET_SCP_LOCAL_FILE, $remote_file will
     * contain as many bytes as filename.ext does on your local filesystem.  If your filename.ext is 1MB then that is how
     * large $remote_file will be, as well.
     *
     * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
     * care of that, yourself.
     *
     * @param string $remote_file
     * @param string $data
     * @param int $mode
     * @param callable $callback
     * @return bool
     * @access public
     */
    function put($remote_file, $data, $mode = NET_SCP_STRING, $callback = null)
    {
        if (!isset($this->ssh)) {
            return false;
        }

        if (empty($remote_file)) {
            user_error('remote_file cannot be blank', E_USER_NOTICE);
            return false;
        }

        if (!$this->ssh->exec('scp -t ' . escapeshellarg($remote_file), false)) { // -t = to
            return false;
        }

        $temp = $this->_receive();
        if ($temp !== chr(0)) {
            return false;
        }

        if ($this->mode == NET_SCP_SSH2) {
            $this->packet_size = $this->ssh->packet_size_client_to_server[NET_SSH2_CHANNEL_EXEC] - 4;
        }

        $remote_file = basename($remote_file);

        if ($mode == NET_SCP_STRING) {
            $size = strlen($data);
        } else {
            if (!is_file($data)) {
                user_error("$data is not a valid file", E_USER_NOTICE);
                return false;
            }

            $fp = @fopen($data, 'rb');
            if (!$fp) {
                return false;
            }
            $size = filesize($data);
        }

        $this->_send('C0644 ' . $size . ' ' . $remote_file . "\n");

        $temp = $this->_receive();
        if ($temp !== chr(0)) {
            return false;
        }

        $sent = 0;
        while ($sent < $size) {
            $temp = $mode & NET_SCP_STRING ? substr($data, $sent, $this->packet_size) : fread($fp, $this->packet_size);
            $this->_send($temp);
            $sent+= strlen($temp);

            if (is_callable($callback)) {
                call_user_func($callback, $sent);
            }
        }
        $this->_close();

        if ($mode != NET_SCP_STRING) {
            fclose($fp);
        }

        return true;
    }

    /**
     * Downloads a file from the SCP server.
     *
     * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
     * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
     * operation
     *
     * @param string $remote_file
     * @param string $local_file
     * @return mixed
     * @access public
     */
    function get($remote_file, $local_file = false)
    {
        if (!isset($this->ssh)) {
            return false;
        }

        if (!$this->ssh->exec('scp -f ' . escapeshellarg($remote_file), false)) { // -f = from
            return false;
        }

        $this->_send("\0");

        if (!preg_match('#(?[^ ]+) (?\d+) (?.+)#', rtrim($this->_receive()), $info)) {
            return false;
        }

        $this->_send("\0");

        $size = 0;

        if ($local_file !== false) {
            $fp = @fopen($local_file, 'wb');
            if (!$fp) {
                return false;
            }
        }

        $content = '';
        while ($size < $info['size']) {
            $data = $this->_receive();
            // SCP usually seems to split stuff out into 16k chunks
            $size+= strlen($data);

            if ($local_file === false) {
                $content.= $data;
            } else {
                fputs($fp, $data);
            }
        }

        $this->_close();

        if ($local_file !== false) {
            fclose($fp);
            return true;
        }

        return $content;
    }

    /**
     * Sends a packet to an SSH server
     *
     * @param string $data
     * @access private
     */
    function _send($data)
    {
        switch ($this->mode) {
            case NET_SCP_SSH2:
                $this->ssh->_send_channel_packet(NET_SSH2_CHANNEL_EXEC, $data);
                break;
            case NET_SCP_SSH1:
                $data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($data), $data);
                $this->ssh->_send_binary_packet($data);
        }
    }

    /**
     * Receives a packet from an SSH server
     *
     * @return string
     * @access private
     */
    function _receive()
    {
        switch ($this->mode) {
            case NET_SCP_SSH2:
                return $this->ssh->_get_channel_packet(NET_SSH2_CHANNEL_EXEC, true);
            case NET_SCP_SSH1:
                if (!$this->ssh->bitmap) {
                    return false;
                }
                while (true) {
                    $response = $this->ssh->_get_binary_packet();
                    switch ($response[NET_SSH1_RESPONSE_TYPE]) {
                        case NET_SSH1_SMSG_STDOUT_DATA:
                            if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
                                return false;
                            }
                            extract(unpack('Nlength', $response[NET_SSH1_RESPONSE_DATA]));
                            return $this->ssh->_string_shift($response[NET_SSH1_RESPONSE_DATA], $length);
                        case NET_SSH1_SMSG_STDERR_DATA:
                            break;
                        case NET_SSH1_SMSG_EXITSTATUS:
                            $this->ssh->_send_binary_packet(chr(NET_SSH1_CMSG_EXIT_CONFIRMATION));
                            fclose($this->ssh->fsock);
                            $this->ssh->bitmap = 0;
                            return false;
                        default:
                            user_error('Unknown packet received', E_USER_NOTICE);
                            return false;
                    }
                }
        }
    }

    /**
     * Closes the connection to an SSH server
     *
     * @access private
     */
    function _close()
    {
        switch ($this->mode) {
            case NET_SCP_SSH2:
                $this->ssh->_close_channel(NET_SSH2_CHANNEL_EXEC, true);
                break;
            case NET_SCP_SSH1:
                $this->ssh->disconnect();
        }
    }
}
phpseclib-1.0.18/phpseclib/Net/SFTP.php000066400000000000000000003074171354156543400175640ustar00rootroot00000000000000
 * login('username', 'password')) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $sftp->pwd() . "\r\n";
 *    $sftp->put('filename.ext', 'hello, world!');
 *    print_r($sftp->nlist());
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Net
 * @package   Net_SFTP
 * @author    Jim Wigginton 
 * @copyright 2009 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * Include Net_SSH2
 */
if (!class_exists('Net_SSH2')) {
    include_once 'SSH2.php';
}

/**#@+
 * @access public
 * @see self::getLog()
 */
/**
 * Returns the message numbers
 */
define('NET_SFTP_LOG_SIMPLE',  NET_SSH2_LOG_SIMPLE);
/**
 * Returns the message content
 */
define('NET_SFTP_LOG_COMPLEX', NET_SSH2_LOG_COMPLEX);
/**
 * Outputs the message content in real-time.
 */
define('NET_SFTP_LOG_REALTIME', 3);
/**#@-*/

/**
 * SFTP channel constant
 *
 * Net_SSH2::exec() uses 0 and Net_SSH2::read() / Net_SSH2::write() use 1.
 *
 * @see Net_SSH2::_send_channel_packet()
 * @see Net_SSH2::_get_channel_packet()
 * @access private
 */
define('NET_SFTP_CHANNEL', 0x100);

/**#@+
 * @access public
 * @see self::put()
 */
/**
 * Reads data from a local file.
 */
define('NET_SFTP_LOCAL_FILE',    1);
/**
 * Reads data from a string.
 */
// this value isn't really used anymore but i'm keeping it reserved for historical reasons
define('NET_SFTP_STRING',        2);
/**
 * Reads data from callback:
 * function callback($length) returns string to proceed, null for EOF
 */
define('NET_SFTP_CALLBACK',     16);
/**
 * Resumes an upload
 */
define('NET_SFTP_RESUME',        4);
/**
 * Append a local file to an already existing remote file
 */
define('NET_SFTP_RESUME_START',  8);
/**#@-*/

/**
 * Pure-PHP implementations of SFTP.
 *
 * @package Net_SFTP
 * @author  Jim Wigginton 
 * @access  public
 */
class Net_SFTP extends Net_SSH2
{
    /**
     * Packet Types
     *
     * @see self::Net_SFTP()
     * @var array
     * @access private
     */
    var $packet_types = array();

    /**
     * Status Codes
     *
     * @see self::Net_SFTP()
     * @var array
     * @access private
     */
    var $status_codes = array();

    /**
     * The Request ID
     *
     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
     * concurrent actions, so it's somewhat academic, here.
     *
     * @var boolean
     * @see self::_send_sftp_packet()
     * @access private
     */
    var $use_request_id = false;

    /**
     * The Packet Type
     *
     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
     * concurrent actions, so it's somewhat academic, here.
     *
     * @var int
     * @see self::_get_sftp_packet()
     * @access private
     */
    var $packet_type = -1;

    /**
     * Packet Buffer
     *
     * @var string
     * @see self::_get_sftp_packet()
     * @access private
     */
    var $packet_buffer = '';

    /**
     * Extensions supported by the server
     *
     * @var array
     * @see self::_initChannel()
     * @access private
     */
    var $extensions = array();

    /**
     * Server SFTP version
     *
     * @var int
     * @see self::_initChannel()
     * @access private
     */
    var $version;

    /**
     * Current working directory
     *
     * @var string
     * @see self::realpath()
     * @see self::chdir()
     * @access private
     */
    var $pwd = false;

    /**
     * Packet Type Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $packet_type_log = array();

    /**
     * Packet Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $packet_log = array();

    /**
     * Error information
     *
     * @see self::getSFTPErrors()
     * @see self::getLastSFTPError()
     * @var array
     * @access private
     */
    var $sftp_errors = array();

    /**
     * Stat Cache
     *
     * Rather than always having to open a directory and close it immediately there after to see if a file is a directory
     * we'll cache the results.
     *
     * @see self::_update_stat_cache()
     * @see self::_remove_from_stat_cache()
     * @see self::_query_stat_cache()
     * @var array
     * @access private
     */
    var $stat_cache = array();

    /**
     * Max SFTP Packet Size
     *
     * @see self::Net_SFTP()
     * @see self::get()
     * @var array
     * @access private
     */
    var $max_sftp_packet;

    /**
     * Stat Cache Flag
     *
     * @see self::disableStatCache()
     * @see self::enableStatCache()
     * @var bool
     * @access private
     */
    var $use_stat_cache = true;

    /**
     * Sort Options
     *
     * @see self::_comparator()
     * @see self::setListOrder()
     * @var array
     * @access private
     */
    var $sortOptions = array();

    /**
     * Canonicalization Flag
     *
     * Determines whether or not paths should be canonicalized before being
     * passed on to the remote server.
     *
     * @see self::enablePathCanonicalization()
     * @see self::disablePathCanonicalization()
     * @see self::realpath()
     * @var bool
     * @access private
     */
    var $canonicalize_paths = true;

    /**
     * Request Buffers
     *
     * @see self::_get_sftp_packet()
     * @var array
     * @access private
     */
    var $requestBuffer = array();

    /**
     * Default Constructor.
     *
     * Connects to an SFTP server
     *
     * @param string $host
     * @param int $port
     * @param int $timeout
     * @return Net_SFTP
     * @access public
     */
    function __construct($host, $port = 22, $timeout = 10)
    {
        parent::__construct($host, $port, $timeout);

        $this->max_sftp_packet = 1 << 15;

        $this->packet_types = array(
            1  => 'NET_SFTP_INIT',
            2  => 'NET_SFTP_VERSION',
            /* the format of SSH_FXP_OPEN changed between SFTPv4 and SFTPv5+:
                   SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.1
               pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3 */
            3  => 'NET_SFTP_OPEN',
            4  => 'NET_SFTP_CLOSE',
            5  => 'NET_SFTP_READ',
            6  => 'NET_SFTP_WRITE',
            7  => 'NET_SFTP_LSTAT',
            9  => 'NET_SFTP_SETSTAT',
            11 => 'NET_SFTP_OPENDIR',
            12 => 'NET_SFTP_READDIR',
            13 => 'NET_SFTP_REMOVE',
            14 => 'NET_SFTP_MKDIR',
            15 => 'NET_SFTP_RMDIR',
            16 => 'NET_SFTP_REALPATH',
            17 => 'NET_SFTP_STAT',
            /* the format of SSH_FXP_RENAME changed between SFTPv4 and SFTPv5+:
                   SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
               pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.5 */
            18 => 'NET_SFTP_RENAME',
            19 => 'NET_SFTP_READLINK',
            20 => 'NET_SFTP_SYMLINK',

            101=> 'NET_SFTP_STATUS',
            102=> 'NET_SFTP_HANDLE',
            /* the format of SSH_FXP_NAME changed between SFTPv3 and SFTPv4+:
                   SFTPv4+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.4
               pre-SFTPv4 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-7 */
            103=> 'NET_SFTP_DATA',
            104=> 'NET_SFTP_NAME',
            105=> 'NET_SFTP_ATTRS',

            200=> 'NET_SFTP_EXTENDED'
        );
        $this->status_codes = array(
            0 => 'NET_SFTP_STATUS_OK',
            1 => 'NET_SFTP_STATUS_EOF',
            2 => 'NET_SFTP_STATUS_NO_SUCH_FILE',
            3 => 'NET_SFTP_STATUS_PERMISSION_DENIED',
            4 => 'NET_SFTP_STATUS_FAILURE',
            5 => 'NET_SFTP_STATUS_BAD_MESSAGE',
            6 => 'NET_SFTP_STATUS_NO_CONNECTION',
            7 => 'NET_SFTP_STATUS_CONNECTION_LOST',
            8 => 'NET_SFTP_STATUS_OP_UNSUPPORTED',
            9 => 'NET_SFTP_STATUS_INVALID_HANDLE',
            10 => 'NET_SFTP_STATUS_NO_SUCH_PATH',
            11 => 'NET_SFTP_STATUS_FILE_ALREADY_EXISTS',
            12 => 'NET_SFTP_STATUS_WRITE_PROTECT',
            13 => 'NET_SFTP_STATUS_NO_MEDIA',
            14 => 'NET_SFTP_STATUS_NO_SPACE_ON_FILESYSTEM',
            15 => 'NET_SFTP_STATUS_QUOTA_EXCEEDED',
            16 => 'NET_SFTP_STATUS_UNKNOWN_PRINCIPAL',
            17 => 'NET_SFTP_STATUS_LOCK_CONFLICT',
            18 => 'NET_SFTP_STATUS_DIR_NOT_EMPTY',
            19 => 'NET_SFTP_STATUS_NOT_A_DIRECTORY',
            20 => 'NET_SFTP_STATUS_INVALID_FILENAME',
            21 => 'NET_SFTP_STATUS_LINK_LOOP',
            22 => 'NET_SFTP_STATUS_CANNOT_DELETE',
            23 => 'NET_SFTP_STATUS_INVALID_PARAMETER',
            24 => 'NET_SFTP_STATUS_FILE_IS_A_DIRECTORY',
            25 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_CONFLICT',
            26 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_REFUSED',
            27 => 'NET_SFTP_STATUS_DELETE_PENDING',
            28 => 'NET_SFTP_STATUS_FILE_CORRUPT',
            29 => 'NET_SFTP_STATUS_OWNER_INVALID',
            30 => 'NET_SFTP_STATUS_GROUP_INVALID',
            31 => 'NET_SFTP_STATUS_NO_MATCHING_BYTE_RANGE_LOCK'
        );
        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-7.1
        // the order, in this case, matters quite a lot - see Net_SFTP::_parseAttributes() to understand why
        $this->attributes = array(
            0x00000001 => 'NET_SFTP_ATTR_SIZE',
            0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+
            0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',
            0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',
            // 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers
            // yields inconsistent behavior depending on how php is compiled.  so we left shift -1 (which, in
            // two's compliment, consists of all 1 bits) by 31.  on 64-bit systems this'll yield 0xFFFFFFFF80000000.
            // that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.
            (-1 << 31) & 0xFFFFFFFF => 'NET_SFTP_ATTR_EXTENDED'
        );
        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3
        // the flag definitions change somewhat in SFTPv5+.  if SFTPv5+ support is added to this library, maybe name
        // the array for that $this->open5_flags and similarly alter the constant names.
        $this->open_flags = array(
            0x00000001 => 'NET_SFTP_OPEN_READ',
            0x00000002 => 'NET_SFTP_OPEN_WRITE',
            0x00000004 => 'NET_SFTP_OPEN_APPEND',
            0x00000008 => 'NET_SFTP_OPEN_CREATE',
            0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',
            0x00000020 => 'NET_SFTP_OPEN_EXCL'
        );
        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
        // see Net_SFTP::_parseLongname() for an explanation
        $this->file_types = array(
            1 => 'NET_SFTP_TYPE_REGULAR',
            2 => 'NET_SFTP_TYPE_DIRECTORY',
            3 => 'NET_SFTP_TYPE_SYMLINK',
            4 => 'NET_SFTP_TYPE_SPECIAL',
            5 => 'NET_SFTP_TYPE_UNKNOWN',
            // the followin types were first defined for use in SFTPv5+
            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
            6 => 'NET_SFTP_TYPE_SOCKET',
            7 => 'NET_SFTP_TYPE_CHAR_DEVICE',
            8 => 'NET_SFTP_TYPE_BLOCK_DEVICE',
            9 => 'NET_SFTP_TYPE_FIFO'
        );
        $this->_define_array(
            $this->packet_types,
            $this->status_codes,
            $this->attributes,
            $this->open_flags,
            $this->file_types
        );

        if (!defined('NET_SFTP_QUEUE_SIZE')) {
            define('NET_SFTP_QUEUE_SIZE', 32);
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param string $host
     * @param int $port
     * @param int $timeout
     * @access public
     */
    function Net_SFTP($host, $port = 22, $timeout = 10)
    {
        $this->__construct($host, $port, $timeout);
    }

    /**
     * Login
     *
     * @param string $username
     * @param string $password
     * @return bool
     * @access public
     */
    function login($username)
    {
        $args = func_get_args();
        $this->auth[] = $args;
        if (!call_user_func_array(array(&$this, '_login'), $args)) {
            return false;
        }

        $this->window_size_server_to_client[NET_SFTP_CHANNEL] = $this->window_size;

        $packet = pack(
            'CNa*N3',
            NET_SSH2_MSG_CHANNEL_OPEN,
            strlen('session'),
            'session',
            NET_SFTP_CHANNEL,
            $this->window_size,
            0x4000
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_OPEN;

        $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
        if ($response === false) {
            return false;
        }

        $packet = pack(
            'CNNa*CNa*',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $this->server_channels[NET_SFTP_CHANNEL],
            strlen('subsystem'),
            'subsystem',
            1,
            strlen('sftp'),
            'sftp'
        );
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;

        $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
        if ($response === false) {
            // from PuTTY's psftp.exe
            $command = "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n" .
                       "test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n" .
                       "exec sftp-server";
            // we don't do $this->exec($command, false) because exec() operates on a different channel and plus the SSH_MSG_CHANNEL_OPEN that exec() does
            // is redundant
            $packet = pack(
                'CNNa*CNa*',
                NET_SSH2_MSG_CHANNEL_REQUEST,
                $this->server_channels[NET_SFTP_CHANNEL],
                strlen('exec'),
                'exec',
                1,
                strlen($command),
                $command
            );
            if (!$this->_send_binary_packet($packet)) {
                return false;
            }

            $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;

            $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
            if ($response === false) {
                return false;
            }
        }

        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_DATA;

        if (!$this->_send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3")) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_VERSION) {
            user_error('Expected SSH_FXP_VERSION');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nversion', $this->_string_shift($response, 4)));
        $this->version = $version;
        while (!empty($response)) {
            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('Nlength', $this->_string_shift($response, 4)));
            $key = $this->_string_shift($response, $length);
            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('Nlength', $this->_string_shift($response, 4)));
            $value = $this->_string_shift($response, $length);
            $this->extensions[$key] = $value;
        }

        /*
         SFTPv4+ defines a 'newline' extension.  SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
         however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
         not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
         one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
         'newline@vandyke.com' would.
        */
        /*
        if (isset($this->extensions['newline@vandyke.com'])) {
            $this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
            unset($this->extensions['newline@vandyke.com']);
        }
        */

        $this->use_request_id = true;

        /*
         A Note on SFTPv4/5/6 support:
          states the following:

         "If the client wishes to interoperate with servers that support noncontiguous version
          numbers it SHOULD send '3'"

         Given that the server only sends its version number after the client has already done so, the above
         seems to be suggesting that v3 should be the default version.  This makes sense given that v3 is the
         most popular.

          states the following;

         "If the server did not send the "versions" extension, or the version-from-list was not included, the
          server MAY send a status response describing the failure, but MUST then close the channel without
          processing any further requests."

         So what do you do if you have a client whose initial SSH_FXP_INIT packet says it implements v3 and
         a server whose initial SSH_FXP_VERSION reply says it implements v4 and only v4?  If it only implements
         v4, the "versions" extension is likely not going to have been sent so version re-negotiation as discussed
         in draft-ietf-secsh-filexfer-13 would be quite impossible.  As such, what Net_SFTP would do is close the
         channel and reopen it with a new and updated SSH_FXP_INIT packet.
        */
        switch ($this->version) {
            case 2:
            case 3:
                break;
            default:
                return false;
        }

        $this->pwd = $this->_realpath('.');

        $this->_update_stat_cache($this->pwd, array());

        return true;
    }

    /**
     * Disable the stat cache
     *
     * @access public
     */
    function disableStatCache()
    {
        $this->use_stat_cache = false;
    }

    /**
     * Enable the stat cache
     *
     * @access public
     */
    function enableStatCache()
    {
        $this->use_stat_cache = true;
    }

    /**
     * Clear the stat cache
     *
     * @access public
     */
    function clearStatCache()
    {
        $this->stat_cache = array();
    }

    /**
     * Enable path canonicalization
     *
     * @access public
     */
    function enablePathCanonicalization()
    {
        $this->canonicalize_paths = true;
    }

    /**
     * Enable path canonicalization
     *
     * @access public
     */
    function disablePathCanonicalization()
    {
        $this->canonicalize_paths = false;
    }

    /**
     * Returns the current directory name
     *
     * @return mixed
     * @access public
     */
    function pwd()
    {
        return $this->pwd;
    }

    /**
     * Logs errors
     *
     * @param string $response
     * @param int $status
     * @access public
     */
    function _logError($response, $status = -1)
    {
        if ($status == -1) {
            if (strlen($response) < 4) {
                return;
            }
            extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        }

        $error = $this->status_codes[$status];

        if ($this->version > 2 || strlen($response) < 4) {
            extract(unpack('Nlength', $this->_string_shift($response, 4)));
            $this->sftp_errors[] = $error . ': ' . $this->_string_shift($response, $length);
        } else {
            $this->sftp_errors[] = $error;
        }
    }

    /**
     * Returns canonicalized absolute pathname
     *
     * realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input
     * path and returns the canonicalized absolute pathname.
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function realpath($path)
    {
        return $this->_realpath($path);
    }

    /**
     * Canonicalize the Server-Side Path Name
     *
     * SFTP doesn't provide a mechanism by which the current working directory can be changed, so we'll emulate it.  Returns
     * the absolute (canonicalized) path.
     *
     * If canonicalize_paths has been disabled using disablePathCanonicalization(), $path is returned as-is.
     *
     * @see self::chdir()
     * @see self::disablePathCanonicalization()
     * @param string $path
     * @return mixed
     * @access private
     */
    function _realpath($path)
    {
        if (!$this->canonicalize_paths) {
            return $path;
        }

        if ($this->pwd === false) {
            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
            if (!$this->_send_sftp_packet(NET_SFTP_REALPATH, pack('Na*', strlen($path), $path))) {
                return false;
            }

            $response = $this->_get_sftp_packet();
            switch ($this->packet_type) {
                case NET_SFTP_NAME:
                    // although SSH_FXP_NAME is implemented differently in SFTPv3 than it is in SFTPv4+, the following
                    // should work on all SFTP versions since the only part of the SSH_FXP_NAME packet the following looks
                    // at is the first part and that part is defined the same in SFTP versions 3 through 6.
                    $this->_string_shift($response, 4); // skip over the count - it should be 1, anyway
                    if (strlen($response) < 4) {
                        return false;
                    }
                    extract(unpack('Nlength', $this->_string_shift($response, 4)));
                    return $this->_string_shift($response, $length);
                case NET_SFTP_STATUS:
                    $this->_logError($response);
                    return false;
                default:
                    user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
                    return false;
            }
        }

        if ($path[0] != '/') {
            $path = $this->pwd . '/' . $path;
        }

        $path = explode('/', $path);
        $new = array();
        foreach ($path as $dir) {
            if (!strlen($dir)) {
                continue;
            }
            switch ($dir) {
                case '..':
                    array_pop($new);
                case '.':
                    break;
                default:
                    $new[] = $dir;
            }
        }

        return '/' . implode('/', $new);
    }

    /**
     * Changes the current directory
     *
     * @param string $dir
     * @return bool
     * @access public
     */
    function chdir($dir)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        // assume current dir if $dir is empty
        if ($dir === '') {
            $dir = './';
        // suffix a slash if needed
        } elseif ($dir[strlen($dir) - 1] != '/') {
            $dir.= '/';
        }

        $dir = $this->_realpath($dir);

        // confirm that $dir is, in fact, a valid directory
        if ($this->use_stat_cache && is_array($this->_query_stat_cache($dir))) {
            $this->pwd = $dir;
            return true;
        }

        // we could do a stat on the alleged $dir to see if it's a directory but that doesn't tell us
        // the currently logged in user has the appropriate permissions or not. maybe you could see if
        // the file's uid / gid match the currently logged in user's uid / gid but how there's no easy
        // way to get those with SFTP

        if (!$this->_send_sftp_packet(NET_SFTP_OPENDIR, pack('Na*', strlen($dir), $dir))) {
            return false;
        }

        // see Net_SFTP::nlist() for a more thorough explanation of the following
        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                $handle = substr($response, 4);
                break;
            case NET_SFTP_STATUS:
                $this->_logError($response);
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }

        if (!$this->_close_handle($handle)) {
            return false;
        }

        $this->_update_stat_cache($dir, array());

        $this->pwd = $dir;
        return true;
    }

    /**
     * Returns a list of files in the given directory
     *
     * @param string $dir
     * @param bool $recursive
     * @return mixed
     * @access public
     */
    function nlist($dir = '.', $recursive = false)
    {
        return $this->_nlist_helper($dir, $recursive, '');
    }

    /**
     * Helper method for nlist
     *
     * @param string $dir
     * @param bool $recursive
     * @param string $relativeDir
     * @return mixed
     * @access private
     */
    function _nlist_helper($dir, $recursive, $relativeDir)
    {
        $files = $this->_list($dir, false);

        if (!$recursive || $files === false) {
            return $files;
        }

        $result = array();
        foreach ($files as $value) {
            if ($value == '.' || $value == '..') {
                if ($relativeDir == '') {
                    $result[] = $value;
                }
                continue;
            }
            if (is_array($this->_query_stat_cache($this->_realpath($dir . '/' . $value)))) {
                $temp = $this->_nlist_helper($dir . '/' . $value, true, $relativeDir . $value . '/');
                $temp = is_array($temp) ? $temp : array();
                $result = array_merge($result, $temp);
            } else {
                $result[] = $relativeDir . $value;
            }
        }

        return $result;
    }

    /**
     * Returns a detailed list of files in the given directory
     *
     * @param string $dir
     * @param bool $recursive
     * @return mixed
     * @access public
     */
    function rawlist($dir = '.', $recursive = false)
    {
        $files = $this->_list($dir, true);
        if (!$recursive || $files === false) {
            return $files;
        }

        static $depth = 0;

        foreach ($files as $key => $value) {
            if ($depth != 0 && $key == '..') {
                unset($files[$key]);
                continue;
            }
            $is_directory = false;
            if ($key != '.' && $key != '..') {
                if ($this->use_stat_cache) {
                    $is_directory = is_array($this->_query_stat_cache($this->_realpath($dir . '/' . $key)));
                } else {
                    $stat = $this->lstat($dir . '/' . $key);
                    $is_directory = $stat && $stat['type'] === NET_SFTP_TYPE_DIRECTORY;
                }
            }

            if ($is_directory) {
                $depth++;
                $files[$key] = $this->rawlist($dir . '/' . $key, true);
                $depth--;
            } else {
                $files[$key] = (object) $value;
            }
        }

        return $files;
    }

    /**
     * Reads a list, be it detailed or not, of files in the given directory
     *
     * @param string $dir
     * @param bool $raw
     * @return mixed
     * @access private
     */
    function _list($dir, $raw = true)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $dir = $this->_realpath($dir . '/');
        if ($dir === false) {
            return false;
        }

        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.2
        if (!$this->_send_sftp_packet(NET_SFTP_OPENDIR, pack('Na*', strlen($dir), $dir))) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.2
                // since 'handle' is the last field in the SSH_FXP_HANDLE packet, we'll just remove the first four bytes that
                // represent the length of the string and leave it at that
                $handle = substr($response, 4);
                break;
            case NET_SFTP_STATUS:
                // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
                $this->_logError($response);
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }

        $this->_update_stat_cache($dir, array());

        $contents = array();
        while (true) {
            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.2
            // why multiple SSH_FXP_READDIR packets would be sent when the response to a single one can span arbitrarily many
            // SSH_MSG_CHANNEL_DATA messages is not known to me.
            if (!$this->_send_sftp_packet(NET_SFTP_READDIR, pack('Na*', strlen($handle), $handle))) {
                return false;
            }

            $response = $this->_get_sftp_packet();
            switch ($this->packet_type) {
                case NET_SFTP_NAME:
                    if (strlen($response) < 4) {
                        return false;
                    }
                    extract(unpack('Ncount', $this->_string_shift($response, 4)));
                    for ($i = 0; $i < $count; $i++) {
                        if (strlen($response) < 4) {
                            return false;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        $shortname = $this->_string_shift($response, $length);
                        if (strlen($response) < 4) {
                            return false;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        $longname = $this->_string_shift($response, $length);
                        $attributes = $this->_parseAttributes($response);
                        if (!isset($attributes['type'])) {
                            $fileType = $this->_parseLongname($longname);
                            if ($fileType) {
                                $attributes['type'] = $fileType;
                            }
                        }
                        $contents[$shortname] = $attributes + array('filename' => $shortname);

                        if (isset($attributes['type']) && $attributes['type'] == NET_SFTP_TYPE_DIRECTORY && ($shortname != '.' && $shortname != '..')) {
                            $this->_update_stat_cache($dir . '/' . $shortname, array());
                        } else {
                            if ($shortname == '..') {
                                $temp = $this->_realpath($dir . '/..') . '/.';
                            } else {
                                $temp = $dir . '/' . $shortname;
                            }
                            $this->_update_stat_cache($temp, (object) array('lstat' => $attributes));
                        }
                        // SFTPv6 has an optional boolean end-of-list field, but we'll ignore that, since the
                        // final SSH_FXP_STATUS packet should tell us that, already.
                    }
                    break;
                case NET_SFTP_STATUS:
                    if (strlen($response) < 4) {
                        return false;
                    }
                    extract(unpack('Nstatus', $this->_string_shift($response, 4)));
                    if ($status != NET_SFTP_STATUS_EOF) {
                        $this->_logError($response, $status);
                        return false;
                    }
                    break 2;
                default:
                    user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
                    return false;
            }
        }

        if (!$this->_close_handle($handle)) {
            return false;
        }

        if (count($this->sortOptions)) {
            uasort($contents, array(&$this, '_comparator'));
        }

        return $raw ? $contents : array_keys($contents);
    }

    /**
     * Compares two rawlist entries using parameters set by setListOrder()
     *
     * Intended for use with uasort()
     *
     * @param array $a
     * @param array $b
     * @return int
     * @access private
     */
    function _comparator($a, $b)
    {
        switch (true) {
            case $a['filename'] === '.' || $b['filename'] === '.':
                if ($a['filename'] === $b['filename']) {
                    return 0;
                }
                return $a['filename'] === '.' ? -1 : 1;
            case $a['filename'] === '..' || $b['filename'] === '..':
                if ($a['filename'] === $b['filename']) {
                    return 0;
                }
                return $a['filename'] === '..' ? -1 : 1;
            case isset($a['type']) && $a['type'] === NET_SFTP_TYPE_DIRECTORY:
                if (!isset($b['type'])) {
                    return 1;
                }
                if ($b['type'] !== $a['type']) {
                    return -1;
                }
                break;
            case isset($b['type']) && $b['type'] === NET_SFTP_TYPE_DIRECTORY:
                return 1;
        }
        foreach ($this->sortOptions as $sort => $order) {
            if (!isset($a[$sort]) || !isset($b[$sort])) {
                if (isset($a[$sort])) {
                    return -1;
                }
                if (isset($b[$sort])) {
                    return 1;
                }
                return 0;
            }
            switch ($sort) {
                case 'filename':
                    $result = strcasecmp($a['filename'], $b['filename']);
                    if ($result) {
                        return $order === SORT_DESC ? -$result : $result;
                    }
                    break;
                case 'permissions':
                case 'mode':
                    $a[$sort]&= 07777;
                    $b[$sort]&= 07777;
                default:
                    if ($a[$sort] === $b[$sort]) {
                        break;
                    }
                    return $order === SORT_ASC ? $a[$sort] - $b[$sort] : $b[$sort] - $a[$sort];
            }
        }
    }

    /**
     * Defines how nlist() and rawlist() will be sorted - if at all.
     *
     * If sorting is enabled directories and files will be sorted independently with
     * directories appearing before files in the resultant array that is returned.
     *
     * Any parameter returned by stat is a valid sort parameter for this function.
     * Filename comparisons are case insensitive.
     *
     * Examples:
     *
     * $sftp->setListOrder('filename', SORT_ASC);
     * $sftp->setListOrder('size', SORT_DESC, 'filename', SORT_ASC);
     * $sftp->setListOrder(true);
     *    Separates directories from files but doesn't do any sorting beyond that
     * $sftp->setListOrder();
     *    Don't do any sort of sorting
     *
     * @access public
     */
    function setListOrder()
    {
        $this->sortOptions = array();
        $args = func_get_args();
        if (empty($args)) {
            return;
        }
        $len = count($args) & 0x7FFFFFFE;
        for ($i = 0; $i < $len; $i+=2) {
            $this->sortOptions[$args[$i]] = $args[$i + 1];
        }
        if (!count($this->sortOptions)) {
            $this->sortOptions = array('bogus' => true);
        }
    }

    /**
     * Returns the file size, in bytes, or false, on failure
     *
     * Files larger than 4GB will show up as being exactly 4GB.
     *
     * @param string $filename
     * @return mixed
     * @access public
     */
    function size($filename)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $result = $this->stat($filename);
        if ($result === false) {
            return false;
        }
        return isset($result['size']) ? $result['size'] : -1;
    }

    /**
     * Save files / directories to cache
     *
     * @param string $path
     * @param mixed $value
     * @access private
     */
    function _update_stat_cache($path, $value)
    {
        if ($this->use_stat_cache === false) {
            return;
        }

        // preg_replace('#^/|/(?=/)|/$#', '', $dir) == str_replace('//', '/', trim($path, '/'))
        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));

        $temp = &$this->stat_cache;
        $max = count($dirs) - 1;
        foreach ($dirs as $i => $dir) {
            // if $temp is an object that means one of two things.
            //  1. a file was deleted and changed to a directory behind phpseclib's back
            //  2. it's a symlink. when lstat is done it's unclear what it's a symlink to
            if (is_object($temp)) {
                $temp = array();
            }
            if (!isset($temp[$dir])) {
                $temp[$dir] = array();
            }
            if ($i === $max) {
                if (is_object($temp[$dir]) && is_object($value)) {
                    if (!isset($value->stat) && isset($temp[$dir]->stat)) {
                        $value->stat = $temp[$dir]->stat;
                    }
                    if (!isset($value->lstat) && isset($temp[$dir]->lstat)) {
                        $value->lstat = $temp[$dir]->lstat;
                    }
                }
                $temp[$dir] = $value;
                break;
            }
            $temp = &$temp[$dir];
        }
    }

    /**
     * Remove files / directories from cache
     *
     * @param string $path
     * @return bool
     * @access private
     */
    function _remove_from_stat_cache($path)
    {
        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));

        $temp = &$this->stat_cache;
        $max = count($dirs) - 1;
        foreach ($dirs as $i => $dir) {
            if ($i === $max) {
                unset($temp[$dir]);
                return true;
            }
            if (!isset($temp[$dir])) {
                return false;
            }
            $temp = &$temp[$dir];
        }
    }

    /**
     * Checks cache for path
     *
     * Mainly used by file_exists
     *
     * @param string $dir
     * @return mixed
     * @access private
     */
    function _query_stat_cache($path)
    {
        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));

        $temp = &$this->stat_cache;
        foreach ($dirs as $dir) {
            if (!isset($temp[$dir])) {
                return null;
            }
            $temp = &$temp[$dir];
        }
        return $temp;
    }

    /**
     * Returns general information about a file.
     *
     * Returns an array on success and false otherwise.
     *
     * @param string $filename
     * @return mixed
     * @access public
     */
    function stat($filename)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $filename = $this->_realpath($filename);
        if ($filename === false) {
            return false;
        }

        if ($this->use_stat_cache) {
            $result = $this->_query_stat_cache($filename);
            if (is_array($result) && isset($result['.']) && isset($result['.']->stat)) {
                return $result['.']->stat;
            }
            if (is_object($result) && isset($result->stat)) {
                return $result->stat;
            }
        }

        $stat = $this->_stat($filename, NET_SFTP_STAT);
        if ($stat === false) {
            $this->_remove_from_stat_cache($filename);
            return false;
        }
        if (isset($stat['type'])) {
            if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
                $filename.= '/.';
            }
            $this->_update_stat_cache($filename, (object) array('stat' => $stat));
            return $stat;
        }

        $pwd = $this->pwd;
        $stat['type'] = $this->chdir($filename) ?
            NET_SFTP_TYPE_DIRECTORY :
            NET_SFTP_TYPE_REGULAR;
        $this->pwd = $pwd;

        if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
            $filename.= '/.';
        }
        $this->_update_stat_cache($filename, (object) array('stat' => $stat));

        return $stat;
    }

    /**
     * Returns general information about a file or symbolic link.
     *
     * Returns an array on success and false otherwise.
     *
     * @param string $filename
     * @return mixed
     * @access public
     */
    function lstat($filename)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $filename = $this->_realpath($filename);
        if ($filename === false) {
            return false;
        }

        if ($this->use_stat_cache) {
            $result = $this->_query_stat_cache($filename);
            if (is_array($result) && isset($result['.']) && isset($result['.']->lstat)) {
                return $result['.']->lstat;
            }
            if (is_object($result) && isset($result->lstat)) {
                return $result->lstat;
            }
        }

        $lstat = $this->_stat($filename, NET_SFTP_LSTAT);
        if ($lstat === false) {
            $this->_remove_from_stat_cache($filename);
            return false;
        }
        if (isset($lstat['type'])) {
            if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
                $filename.= '/.';
            }
            $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));
            return $lstat;
        }

        $stat = $this->_stat($filename, NET_SFTP_STAT);

        if ($lstat != $stat) {
            $lstat = array_merge($lstat, array('type' => NET_SFTP_TYPE_SYMLINK));
            $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));
            return $stat;
        }

        $pwd = $this->pwd;
        $lstat['type'] = $this->chdir($filename) ?
            NET_SFTP_TYPE_DIRECTORY :
            NET_SFTP_TYPE_REGULAR;
        $this->pwd = $pwd;

        if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
            $filename.= '/.';
        }
        $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));

        return $lstat;
    }

    /**
     * Returns general information about a file or symbolic link
     *
     * Determines information without calling Net_SFTP::realpath().
     * The second parameter can be either NET_SFTP_STAT or NET_SFTP_LSTAT.
     *
     * @param string $filename
     * @param int $type
     * @return mixed
     * @access private
     */
    function _stat($filename, $type)
    {
        // SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
        $packet = pack('Na*', strlen($filename), $filename);
        if (!$this->_send_sftp_packet($type, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_ATTRS:
                return $this->_parseAttributes($response);
            case NET_SFTP_STATUS:
                $this->_logError($response);
                return false;
        }

        user_error('Expected SSH_FXP_ATTRS or SSH_FXP_STATUS');
        return false;
    }

    /**
     * Truncates a file to a given length
     *
     * @param string $filename
     * @param int $new_size
     * @return bool
     * @access public
     */
    function truncate($filename, $new_size)
    {
        $attr = pack('N3', NET_SFTP_ATTR_SIZE, $new_size / 4294967296, $new_size); // 4294967296 == 0x100000000 == 1<<32

        return $this->_setstat($filename, $attr, false);
    }

    /**
     * Sets access and modification time of file.
     *
     * If the file does not exist, it will be created.
     *
     * @param string $filename
     * @param int $time
     * @param int $atime
     * @return bool
     * @access public
     */
    function touch($filename, $time = null, $atime = null)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $filename = $this->_realpath($filename);
        if ($filename === false) {
            return false;
        }

        if (!isset($time)) {
            $time = time();
        }
        if (!isset($atime)) {
            $atime = $time;
        }

        $flags = NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE | NET_SFTP_OPEN_EXCL;
        $attr = pack('N3', NET_SFTP_ATTR_ACCESSTIME, $time, $atime);
        $packet = pack('Na*Na*', strlen($filename), $filename, $flags, $attr);
        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                return $this->_close_handle(substr($response, 4));
            case NET_SFTP_STATUS:
                $this->_logError($response);
                break;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }

        return $this->_setstat($filename, $attr, false);
    }

    /**
     * Changes file or directory owner
     *
     * Returns true on success or false on error.
     *
     * @param string $filename
     * @param int $uid
     * @param bool $recursive
     * @return bool
     * @access public
     */
    function chown($filename, $uid, $recursive = false)
    {
        // quoting from ,
        // "if the owner or group is specified as -1, then that ID is not changed"
        $attr = pack('N3', NET_SFTP_ATTR_UIDGID, $uid, -1);

        return $this->_setstat($filename, $attr, $recursive);
    }

    /**
     * Changes file or directory group
     *
     * Returns true on success or false on error.
     *
     * @param string $filename
     * @param int $gid
     * @param bool $recursive
     * @return bool
     * @access public
     */
    function chgrp($filename, $gid, $recursive = false)
    {
        $attr = pack('N3', NET_SFTP_ATTR_UIDGID, -1, $gid);

        return $this->_setstat($filename, $attr, $recursive);
    }

    /**
     * Set permissions on a file.
     *
     * Returns the new file permissions on success or false on error.
     * If $recursive is true than this just returns true or false.
     *
     * @param int $mode
     * @param string $filename
     * @param bool $recursive
     * @return mixed
     * @access public
     */
    function chmod($mode, $filename, $recursive = false)
    {
        if (is_string($mode) && is_int($filename)) {
            $temp = $mode;
            $mode = $filename;
            $filename = $temp;
        }

        $attr = pack('N2', NET_SFTP_ATTR_PERMISSIONS, $mode & 07777);
        if (!$this->_setstat($filename, $attr, $recursive)) {
            return false;
        }
        if ($recursive) {
            return true;
        }

        $filename = $this->realpath($filename);
        // rather than return what the permissions *should* be, we'll return what they actually are.  this will also
        // tell us if the file actually exists.
        // incidentally, SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
        $packet = pack('Na*', strlen($filename), $filename);
        if (!$this->_send_sftp_packet(NET_SFTP_STAT, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_ATTRS:
                $attrs = $this->_parseAttributes($response);
                return $attrs['permissions'];
            case NET_SFTP_STATUS:
                $this->_logError($response);
                return false;
        }

        user_error('Expected SSH_FXP_ATTRS or SSH_FXP_STATUS');
        return false;
    }

    /**
     * Sets information about a file
     *
     * @param string $filename
     * @param string $attr
     * @param bool $recursive
     * @return bool
     * @access private
     */
    function _setstat($filename, $attr, $recursive)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $filename = $this->_realpath($filename);
        if ($filename === false) {
            return false;
        }

        $this->_remove_from_stat_cache($filename);

        if ($recursive) {
            $i = 0;
            $result = $this->_setstat_recursive($filename, $attr, $i);
            $this->_read_put_responses($i);
            return $result;
        }

        // SFTPv4+ has an additional byte field - type - that would need to be sent, as well. setting it to
        // SSH_FILEXFER_TYPE_UNKNOWN might work. if not, we'd have to do an SSH_FXP_STAT before doing an SSH_FXP_SETSTAT.
        if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($filename), $filename, $attr))) {
            return false;
        }

        /*
         "Because some systems must use separate system calls to set various attributes, it is possible that a failure
          response will be returned, but yet some of the attributes may be have been successfully modified.  If possible,
          servers SHOULD avoid this situation; however, clients MUST be aware that this is possible."

          -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.6
        */
        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            return false;
        }

        return true;
    }

    /**
     * Recursively sets information on directories on the SFTP server
     *
     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
     *
     * @param string $path
     * @param string $attr
     * @param int $i
     * @return bool
     * @access private
     */
    function _setstat_recursive($path, $attr, &$i)
    {
        if (!$this->_read_put_responses($i)) {
            return false;
        }
        $i = 0;
        $entries = $this->_list($path, true);

        if ($entries === false) {
            return $this->_setstat($path, $attr, false);
        }

        // normally $entries would have at least . and .. but it might not if the directories
        // permissions didn't allow reading
        if (empty($entries)) {
            return false;
        }

        unset($entries['.'], $entries['..']);
        foreach ($entries as $filename => $props) {
            if (!isset($props['type'])) {
                return false;
            }

            $temp = $path . '/' . $filename;
            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
                if (!$this->_setstat_recursive($temp, $attr, $i)) {
                    return false;
                }
            } else {
                if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($temp), $temp, $attr))) {
                    return false;
                }

                $i++;

                if ($i >= NET_SFTP_QUEUE_SIZE) {
                    if (!$this->_read_put_responses($i)) {
                        return false;
                    }
                    $i = 0;
                }
            }
        }

        if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($path), $path, $attr))) {
            return false;
        }

        $i++;

        if ($i >= NET_SFTP_QUEUE_SIZE) {
            if (!$this->_read_put_responses($i)) {
                return false;
            }
            $i = 0;
        }

        return true;
    }

    /**
     * Return the target of a symbolic link
     *
     * @param string $link
     * @return mixed
     * @access public
     */
    function readlink($link)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $link = $this->_realpath($link);

        if (!$this->_send_sftp_packet(NET_SFTP_READLINK, pack('Na*', strlen($link), $link))) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_NAME:
                break;
            case NET_SFTP_STATUS:
                $this->_logError($response);
                return false;
            default:
                user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
                return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Ncount', $this->_string_shift($response, 4)));
        // the file isn't a symlink
        if (!$count) {
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nlength', $this->_string_shift($response, 4)));
        return $this->_string_shift($response, $length);
    }

    /**
     * Create a symlink
     *
     * symlink() creates a symbolic link to the existing target with the specified name link.
     *
     * @param string $target
     * @param string $link
     * @return bool
     * @access public
     */
    function symlink($target, $link)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        //$target = $this->_realpath($target);
        $link = $this->_realpath($link);

        $packet = pack('Na*Na*', strlen($target), $target, strlen($link), $link);
        if (!$this->_send_sftp_packet(NET_SFTP_SYMLINK, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            return false;
        }

        return true;
    }

    /**
     * Creates a directory.
     *
     * @param string $dir
     * @return bool
     * @access public
     */
    function mkdir($dir, $mode = -1, $recursive = false)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $dir = $this->_realpath($dir);
        // by not providing any permissions, hopefully the server will use the logged in users umask - their
        // default permissions.
        $attr = $mode == -1 ? "\0\0\0\0" : pack('N2', NET_SFTP_ATTR_PERMISSIONS, $mode & 07777);

        if ($recursive) {
            $dirs = explode('/', preg_replace('#/(?=/)|/$#', '', $dir));
            if (empty($dirs[0])) {
                array_shift($dirs);
                $dirs[0] = '/' . $dirs[0];
            }
            for ($i = 0; $i < count($dirs); $i++) {
                $temp = array_slice($dirs, 0, $i + 1);
                $temp = implode('/', $temp);
                $result = $this->_mkdir_helper($temp, $attr);
            }
            return $result;
        }

        return $this->_mkdir_helper($dir, $attr);
    }

    /**
     * Helper function for directory creation
     *
     * @param string $dir
     * @return bool
     * @access private
     */
    function _mkdir_helper($dir, $attr)
    {
        if (!$this->_send_sftp_packet(NET_SFTP_MKDIR, pack('Na*a*', strlen($dir), $dir, $attr))) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            return false;
        }

        return true;
    }

    /**
     * Removes a directory.
     *
     * @param string $dir
     * @return bool
     * @access public
     */
    function rmdir($dir)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $dir = $this->_realpath($dir);
        if ($dir === false) {
            return false;
        }

        if (!$this->_send_sftp_packet(NET_SFTP_RMDIR, pack('Na*', strlen($dir), $dir))) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED?
            $this->_logError($response, $status);
            return false;
        }

        $this->_remove_from_stat_cache($dir);
        // the following will do a soft delete, which would be useful if you deleted a file
        // and then tried to do a stat on the deleted file. the above, in contrast, does
        // a hard delete
        //$this->_update_stat_cache($dir, false);

        return true;
    }

    /**
     * Uploads a file to the SFTP server.
     *
     * By default, Net_SFTP::put() does not read from the local filesystem.  $data is dumped directly into $remote_file.
     * So, for example, if you set $data to 'filename.ext' and then do Net_SFTP::get(), you will get a file, twelve bytes
     * long, containing 'filename.ext' as its contents.
     *
     * Setting $mode to NET_SFTP_LOCAL_FILE will change the above behavior.  With NET_SFTP_LOCAL_FILE, $remote_file will
     * contain as many bytes as filename.ext does on your local filesystem.  If your filename.ext is 1MB then that is how
     * large $remote_file will be, as well.
     *
     * If $data is a resource then it'll be used as a resource instead.
     *
     *
     * Setting $mode to NET_SFTP_CALLBACK will use $data as callback function, which gets only one parameter -- number
     * of bytes to return, and returns a string if there is some data or null if there is no more data
     *
     * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
     * care of that, yourself.
     *
     * $mode can take an additional two parameters - NET_SFTP_RESUME and NET_SFTP_RESUME_START. These are bitwise AND'd with
     * $mode. So if you want to resume upload of a 300mb file on the local file system you'd set $mode to the following:
     *
     * NET_SFTP_LOCAL_FILE | NET_SFTP_RESUME
     *
     * If you wanted to simply append the full contents of a local file to the full contents of a remote file you'd replace
     * NET_SFTP_RESUME with NET_SFTP_RESUME_START.
     *
     * If $mode & (NET_SFTP_RESUME | NET_SFTP_RESUME_START) then NET_SFTP_RESUME_START will be assumed.
     *
     * $start and $local_start give you more fine grained control over this process and take precident over NET_SFTP_RESUME
     * when they're non-negative. ie. $start could let you write at the end of a file (like NET_SFTP_RESUME) or in the middle
     * of one. $local_start could let you start your reading from the end of a file (like NET_SFTP_RESUME_START) or in the
     * middle of one.
     *
     * Setting $local_start to > 0 or $mode | NET_SFTP_RESUME_START doesn't do anything unless $mode | NET_SFTP_LOCAL_FILE.
     *
     * @param string $remote_file
     * @param string|resource $data
     * @param int $mode
     * @param int $start
     * @param int $local_start
     * @param callable|null $progressCallback
     * @return bool
     * @access public
     * @internal ASCII mode for SFTPv4/5/6 can be supported by adding a new function - Net_SFTP::setMode().
     */
    function put($remote_file, $data, $mode = NET_SFTP_STRING, $start = -1, $local_start = -1, $progressCallback = null)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $remote_file = $this->_realpath($remote_file);
        if ($remote_file === false) {
            return false;
        }

        $this->_remove_from_stat_cache($remote_file);

        $flags = NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE;
        // according to the SFTP specs, NET_SFTP_OPEN_APPEND should "force all writes to append data at the end of the file."
        // in practice, it doesn't seem to do that.
        //$flags|= ($mode & NET_SFTP_RESUME) ? NET_SFTP_OPEN_APPEND : NET_SFTP_OPEN_TRUNCATE;

        if ($start >= 0) {
            $offset = $start;
        } elseif ($mode & NET_SFTP_RESUME) {
            // if NET_SFTP_OPEN_APPEND worked as it should _size() wouldn't need to be called
            $size = $this->size($remote_file);
            $offset = $size !== false ? $size : 0;
        } else {
            $offset = 0;
            $flags|= NET_SFTP_OPEN_TRUNCATE;
        }

        $packet = pack('Na*N2', strlen($remote_file), $remote_file, $flags, 0);
        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                $handle = substr($response, 4);
                break;
            case NET_SFTP_STATUS:
                $this->_logError($response);
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }

        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.3
        $dataCallback = false;
        switch (true) {
            case $mode & NET_SFTP_CALLBACK:
                if (!is_callable($data)) {
                    user_error("\$data should be is_callable if you set NET_SFTP_CALLBACK flag");
                }
                $dataCallback = $data;
                // do nothing
                break;
            case is_resource($data):
                $mode = $mode & ~NET_SFTP_LOCAL_FILE;
                $info = stream_get_meta_data($data);
                if ($info['wrapper_type'] == 'PHP' && $info['stream_type'] == 'Input') {
                    $fp = fopen('php://memory', 'w+');
                    stream_copy_to_stream($data, $fp);
                    rewind($fp);
                } else {
                    $fp = $data;
                }
                break;
            case $mode & NET_SFTP_LOCAL_FILE:
                if (!is_file($data)) {
                    user_error("$data is not a valid file");
                    return false;
                }
                $fp = @fopen($data, 'rb');
                if (!$fp) {
                    return false;
                }
        }

        if (isset($fp)) {
            $stat = fstat($fp);
            $size = !empty($stat) ? $stat['size'] : 0;

            if ($local_start >= 0) {
                fseek($fp, $local_start);
                $size-= $local_start;
            }
        } elseif ($dataCallback) {
            $size = 0;
        } else {
            $size = strlen($data);
        }

        $sent = 0;
        $size = $size < 0 ? ($size & 0x7FFFFFFF) + 0x80000000 : $size;

        $sftp_packet_size = 4096; // PuTTY uses 4096
        // make the SFTP packet be exactly 4096 bytes by including the bytes in the NET_SFTP_WRITE packets "header"
        $sftp_packet_size-= strlen($handle) + 25;
        $i = 0;
        while ($dataCallback || ($size === 0 || $sent < $size)) {
            if ($dataCallback) {
                $temp = call_user_func($dataCallback, $sftp_packet_size);
                if (is_null($temp)) {
                    break;
                }
            } else {
                $temp = isset($fp) ? fread($fp, $sftp_packet_size) : substr($data, $sent, $sftp_packet_size);
                if ($temp === false || $temp === '') {
                    break;
                }
            }

            $subtemp = $offset + $sent;
            $packet = pack('Na*N3a*', strlen($handle), $handle, $subtemp / 4294967296, $subtemp, strlen($temp), $temp);
            if (!$this->_send_sftp_packet(NET_SFTP_WRITE, $packet)) {
                if ($mode & NET_SFTP_LOCAL_FILE) {
                    fclose($fp);
                }
                return false;
            }
            $sent+= strlen($temp);
            if (is_callable($progressCallback)) {
                call_user_func($progressCallback, $sent);
            }

            $i++;

            if ($i == NET_SFTP_QUEUE_SIZE) {
                if (!$this->_read_put_responses($i)) {
                    $i = 0;
                    break;
                }
                $i = 0;
            }
        }

        if (!$this->_read_put_responses($i)) {
            if ($mode & NET_SFTP_LOCAL_FILE) {
                fclose($fp);
            }
            $this->_close_handle($handle);
            return false;
        }

        if ($mode & NET_SFTP_LOCAL_FILE) {
            fclose($fp);
        }

        return $this->_close_handle($handle);
    }

    /**
     * Reads multiple successive SSH_FXP_WRITE responses
     *
     * Sending an SSH_FXP_WRITE packet and immediately reading its response isn't as efficient as blindly sending out $i
     * SSH_FXP_WRITEs, in succession, and then reading $i responses.
     *
     * @param int $i
     * @return bool
     * @access private
     */
    function _read_put_responses($i)
    {
        while ($i--) {
            $response = $this->_get_sftp_packet();
            if ($this->packet_type != NET_SFTP_STATUS) {
                user_error('Expected SSH_FXP_STATUS');
                return false;
            }

            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('Nstatus', $this->_string_shift($response, 4)));
            if ($status != NET_SFTP_STATUS_OK) {
                $this->_logError($response, $status);
                break;
            }
        }

        return $i < 0;
    }

    /**
     * Close handle
     *
     * @param string $handle
     * @return bool
     * @access private
     */
    function _close_handle($handle)
    {
        if (!$this->_send_sftp_packet(NET_SFTP_CLOSE, pack('Na*', strlen($handle), $handle))) {
            return false;
        }

        // "The client MUST release all resources associated with the handle regardless of the status."
        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.3
        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            return false;
        }

        return true;
    }

    /**
     * Downloads a file from the SFTP server.
     *
     * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
     * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
     * operation.
     *
     * $offset and $length can be used to download files in chunks.
     *
     * @param string $remote_file
     * @param string $local_file
     * @param int $offset
     * @param int $length
     * @param callable|null $progressCallback
     * @return mixed
     * @access public
     */
    function get($remote_file, $local_file = false, $offset = 0, $length = -1, $progressCallback = null)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $remote_file = $this->_realpath($remote_file);
        if ($remote_file === false) {
            return false;
        }

        $packet = pack('Na*N2', strlen($remote_file), $remote_file, NET_SFTP_OPEN_READ, 0);
        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                $handle = substr($response, 4);
                break;
            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
                $this->_logError($response);
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }

        if (is_resource($local_file)) {
            $fp = $local_file;
            $stat = fstat($fp);
            $res_offset = $stat['size'];
        } else {
            $res_offset = 0;
            if ($local_file !== false) {
                $fp = fopen($local_file, 'wb');
                if (!$fp) {
                    return false;
                }
            } else {
                $content = '';
            }
        }

        $fclose_check = $local_file !== false && !is_resource($local_file);

        $start = $offset;
        $read = 0;
        while (true) {
            $i = 0;

            while ($i < NET_SFTP_QUEUE_SIZE && ($length < 0 || $read < $length)) {
                $tempoffset = $start + $read;

                $packet_size = $length > 0 ? min($this->max_sftp_packet, $length - $read) : $this->max_sftp_packet;

                $packet = pack('Na*N3', strlen($handle), $handle, $tempoffset / 4294967296, $tempoffset, $packet_size);
                if (!$this->_send_sftp_packet(NET_SFTP_READ, $packet, $i)) {
                    if ($fclose_check) {
                        fclose($fp);
                    }
                    return false;
                }
                $packet = null;
                $read+= $packet_size;
                if (is_callable($progressCallback)) {
                    call_user_func($progressCallback, $read);
                }
                $i++;
            }

            if (!$i) {
                break;
            }

            $packets_sent = $i - 1;

            $clear_responses = false;
            while ($i > 0) {
                $i--;

                if ($clear_responses) {
                    $this->_get_sftp_packet($packets_sent - $i);
                    continue;
                } else {
                    $response = $this->_get_sftp_packet($packets_sent - $i);
                }

                switch ($this->packet_type) {
                    case NET_SFTP_DATA:
                        $temp = substr($response, 4);
                        $offset+= strlen($temp);
                        if ($local_file === false) {
                            $content.= $temp;
                        } else {
                            fputs($fp, $temp);
                        }
                        $temp = null;
                        break;
                    case NET_SFTP_STATUS:
                        // could, in theory, return false if !strlen($content) but we'll hold off for the time being
                        $this->_logError($response);
                        $clear_responses = true; // don't break out of the loop yet, so we can read the remaining responses
                        break;
                    default:
                        if ($fclose_check) {
                            fclose($fp);
                        }
                        user_error('Expected SSH_FX_DATA or SSH_FXP_STATUS');
                }
                $response = null;
            }

            if ($clear_responses) {
                break;
            }
        }

        if ($length > 0 && $length <= $offset - $start) {
            if ($local_file === false) {
                $content = substr($content, 0, $length);
            } else {
                ftruncate($fp, $length + $res_offset);
            }
        }

        if ($fclose_check) {
            fclose($fp);
        }

        if (!$this->_close_handle($handle)) {
            return false;
        }

        // if $content isn't set that means a file was written to
        return isset($content) ? $content : true;
    }

    /**
     * Deletes a file on the SFTP server.
     *
     * @param string $path
     * @param bool $recursive
     * @return bool
     * @access public
     */
    function delete($path, $recursive = true)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        if (is_object($path)) {
            // It's an object. Cast it as string before we check anything else.
            $path = (string) $path;
        }

        if (!is_string($path) || $path == '') {
            return false;
        }

        $path = $this->_realpath($path);
        if ($path === false) {
            return false;
        }

        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
        if (!$this->_send_sftp_packet(NET_SFTP_REMOVE, pack('Na*', strlen($path), $path))) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            if (!$recursive) {
                return false;
            }
            $i = 0;
            $result = $this->_delete_recursive($path, $i);
            $this->_read_put_responses($i);
            return $result;
        }

        $this->_remove_from_stat_cache($path);

        return true;
    }

    /**
     * Recursively deletes directories on the SFTP server
     *
     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
     *
     * @param string $path
     * @param int $i
     * @return bool
     * @access private
     */
    function _delete_recursive($path, &$i)
    {
        if (!$this->_read_put_responses($i)) {
            return false;
        }
        $i = 0;
        $entries = $this->_list($path, true);

        // normally $entries would have at least . and .. but it might not if the directories
        // permissions didn't allow reading
        if (empty($entries)) {
            return false;
        }

        unset($entries['.'], $entries['..']);
        foreach ($entries as $filename => $props) {
            if (!isset($props['type'])) {
                return false;
            }

            $temp = $path . '/' . $filename;
            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
                if (!$this->_delete_recursive($temp, $i)) {
                    return false;
                }
            } else {
                if (!$this->_send_sftp_packet(NET_SFTP_REMOVE, pack('Na*', strlen($temp), $temp))) {
                    return false;
                }
                $this->_remove_from_stat_cache($temp);

                $i++;

                if ($i >= NET_SFTP_QUEUE_SIZE) {
                    if (!$this->_read_put_responses($i)) {
                        return false;
                    }
                    $i = 0;
                }
            }
        }

        if (!$this->_send_sftp_packet(NET_SFTP_RMDIR, pack('Na*', strlen($path), $path))) {
            return false;
        }
        $this->_remove_from_stat_cache($path);

        $i++;

        if ($i >= NET_SFTP_QUEUE_SIZE) {
            if (!$this->_read_put_responses($i)) {
                return false;
            }
            $i = 0;
        }

        return true;
    }

    /**
     * Checks whether a file or directory exists
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function file_exists($path)
    {
        if ($this->use_stat_cache) {
            $path = $this->_realpath($path);

            $result = $this->_query_stat_cache($path);

            if (isset($result)) {
                // return true if $result is an array or if it's an stdClass object
                return $result !== false;
            }
        }

        return $this->stat($path) !== false;
    }

    /**
     * Tells whether the filename is a directory
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_dir($path)
    {
        $result = $this->_get_stat_cache_prop($path, 'type');
        if ($result === false) {
            return false;
        }
        return $result === NET_SFTP_TYPE_DIRECTORY;
    }

    /**
     * Tells whether the filename is a regular file
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_file($path)
    {
        $result = $this->_get_stat_cache_prop($path, 'type');
        if ($result === false) {
            return false;
        }
        return $result === NET_SFTP_TYPE_REGULAR;
    }

    /**
     * Tells whether the filename is a symbolic link
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_link($path)
    {
        $result = $this->_get_lstat_cache_prop($path, 'type');
        if ($result === false) {
            return false;
        }
        return $result === NET_SFTP_TYPE_SYMLINK;
    }

    /**
     * Tells whether a file exists and is readable
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_readable($path)
    {
        $path = $this->_realpath($path);

        $packet = pack('Na*N2', strlen($path), $path, NET_SFTP_OPEN_READ, 0);
        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                return true;
            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }
    }

    /**
     * Tells whether the filename is writable
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_writable($path)
    {
        $path = $this->_realpath($path);

        $packet = pack('Na*N2', strlen($path), $path, NET_SFTP_OPEN_WRITE, 0);
        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        switch ($this->packet_type) {
            case NET_SFTP_HANDLE:
                return true;
            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
                return false;
            default:
                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
                return false;
        }
    }

    /**
     * Tells whether the filename is writeable
     *
     * Alias of is_writable
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function is_writeable($path)
    {
        return $this->is_writable($path);
    }

    /**
     * Gets last access time of file
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function fileatime($path)
    {
        return $this->_get_stat_cache_prop($path, 'atime');
    }

    /**
     * Gets file modification time
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function filemtime($path)
    {
        return $this->_get_stat_cache_prop($path, 'mtime');
    }

    /**
     * Gets file permissions
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function fileperms($path)
    {
        return $this->_get_stat_cache_prop($path, 'permissions');
    }

    /**
     * Gets file owner
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function fileowner($path)
    {
        return $this->_get_stat_cache_prop($path, 'uid');
    }

    /**
     * Gets file group
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function filegroup($path)
    {
        return $this->_get_stat_cache_prop($path, 'gid');
    }

    /**
     * Gets file size
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function filesize($path)
    {
        return $this->_get_stat_cache_prop($path, 'size');
    }

    /**
     * Gets file type
     *
     * @param string $path
     * @return mixed
     * @access public
     */
    function filetype($path)
    {
        $type = $this->_get_stat_cache_prop($path, 'type');
        if ($type === false) {
            return false;
        }

        switch ($type) {
            case NET_SFTP_TYPE_BLOCK_DEVICE:
                return 'block';
            case NET_SFTP_TYPE_CHAR_DEVICE:
                return 'char';
            case NET_SFTP_TYPE_DIRECTORY:
                return 'dir';
            case NET_SFTP_TYPE_FIFO:
                return 'fifo';
            case NET_SFTP_TYPE_REGULAR:
                return 'file';
            case NET_SFTP_TYPE_SYMLINK:
                return 'link';
            default:
                return false;
        }
    }

    /**
     * Return a stat properity
     *
     * Uses cache if appropriate.
     *
     * @param string $path
     * @param string $prop
     * @return mixed
     * @access private
     */
    function _get_stat_cache_prop($path, $prop)
    {
        return $this->_get_xstat_cache_prop($path, $prop, 'stat');
    }

    /**
     * Return an lstat properity
     *
     * Uses cache if appropriate.
     *
     * @param string $path
     * @param string $prop
     * @return mixed
     * @access private
     */
    function _get_lstat_cache_prop($path, $prop)
    {
        return $this->_get_xstat_cache_prop($path, $prop, 'lstat');
    }

    /**
     * Return a stat or lstat properity
     *
     * Uses cache if appropriate.
     *
     * @param string $path
     * @param string $prop
     * @return mixed
     * @access private
     */
    function _get_xstat_cache_prop($path, $prop, $type)
    {
        if ($this->use_stat_cache) {
            $path = $this->_realpath($path);

            $result = $this->_query_stat_cache($path);

            if (is_object($result) && isset($result->$type)) {
                return $result->{$type}[$prop];
            }
        }

        $result = $this->$type($path);

        if ($result === false || !isset($result[$prop])) {
            return false;
        }

        return $result[$prop];
    }

    /**
     * Renames a file or a directory on the SFTP server
     *
     * @param string $oldname
     * @param string $newname
     * @return bool
     * @access public
     */
    function rename($oldname, $newname)
    {
        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
            return false;
        }

        $oldname = $this->_realpath($oldname);
        $newname = $this->_realpath($newname);
        if ($oldname === false || $newname === false) {
            return false;
        }

        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
        $packet = pack('Na*Na*', strlen($oldname), $oldname, strlen($newname), $newname);
        if (!$this->_send_sftp_packet(NET_SFTP_RENAME, $packet)) {
            return false;
        }

        $response = $this->_get_sftp_packet();
        if ($this->packet_type != NET_SFTP_STATUS) {
            user_error('Expected SSH_FXP_STATUS');
            return false;
        }

        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
        if (strlen($response) < 4) {
            return false;
        }
        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
        if ($status != NET_SFTP_STATUS_OK) {
            $this->_logError($response, $status);
            return false;
        }

        // don't move the stat cache entry over since this operation could very well change the
        // atime and mtime attributes
        //$this->_update_stat_cache($newname, $this->_query_stat_cache($oldname));
        $this->_remove_from_stat_cache($oldname);
        $this->_remove_from_stat_cache($newname);

        return true;
    }

    /**
     * Parse Attributes
     *
     * See '7.  File Attributes' of draft-ietf-secsh-filexfer-13 for more info.
     *
     * @param string $response
     * @return array
     * @access private
     */
    function _parseAttributes(&$response)
    {
        $attr = array();
        if (strlen($response) < 4) {
            user_error('Malformed file attributes');
            return array();
        }
        extract(unpack('Nflags', $this->_string_shift($response, 4)));
        // SFTPv4+ have a type field (a byte) that follows the above flag field
        foreach ($this->attributes as $key => $value) {
            switch ($flags & $key) {
                case NET_SFTP_ATTR_SIZE: // 0x00000001
                    // The size attribute is defined as an unsigned 64-bit integer.
                    // The following will use floats on 32-bit platforms, if necessary.
                    // As can be seen in the BigInteger class, floats are generally
                    // IEEE 754 binary64 "double precision" on such platforms and
                    // as such can represent integers of at least 2^50 without loss
                    // of precision. Interpreted in filesize, 2^50 bytes = 1024 TiB.
                    $attr['size'] = hexdec(bin2hex($this->_string_shift($response, 8)));
                    break;
                case NET_SFTP_ATTR_UIDGID: // 0x00000002 (SFTPv3 only)
                    if (strlen($response) < 8) {
                        user_error('Malformed file attributes');
                        return $attr;
                    }
                    $attr+= unpack('Nuid/Ngid', $this->_string_shift($response, 8));
                    break;
                case NET_SFTP_ATTR_PERMISSIONS: // 0x00000004
                    if (strlen($response) < 4) {
                        user_error('Malformed file attributes');
                        return $attr;
                    }
                    $attr+= unpack('Npermissions', $this->_string_shift($response, 4));
                    // mode == permissions; permissions was the original array key and is retained for bc purposes.
                    // mode was added because that's the more industry standard terminology
                    $attr+= array('mode' => $attr['permissions']);
                    $fileType = $this->_parseMode($attr['permissions']);
                    if ($fileType !== false) {
                        $attr+= array('type' => $fileType);
                    }
                    break;
                case NET_SFTP_ATTR_ACCESSTIME: // 0x00000008
                    if (strlen($response) < 8) {
                        user_error('Malformed file attributes');
                        return $attr;
                    }
                    $attr+= unpack('Natime/Nmtime', $this->_string_shift($response, 8));
                    break;
                case NET_SFTP_ATTR_EXTENDED: // 0x80000000
                    if (strlen($response) < 4) {
                        user_error('Malformed file attributes');
                        return $attr;
                    }
                    extract(unpack('Ncount', $this->_string_shift($response, 4)));
                    for ($i = 0; $i < $count; $i++) {
                        if (strlen($response) < 4) {
                            user_error('Malformed file attributes');
                            return $attr;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        $key = $this->_string_shift($response, $length);
                        if (strlen($response) < 4) {
                            user_error('Malformed file attributes');
                            return $attr;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        $attr[$key] = $this->_string_shift($response, $length);
                    }
            }
        }
        return $attr;
    }

    /**
     * Attempt to identify the file type
     *
     * Quoting the SFTP RFC, "Implementations MUST NOT send bits that are not defined" but they seem to anyway
     *
     * @param int $mode
     * @return int
     * @access private
     */
    function _parseMode($mode)
    {
        // values come from http://lxr.free-electrons.com/source/include/uapi/linux/stat.h#L12
        // see, also, http://linux.die.net/man/2/stat
        switch ($mode & 0170000) {// ie. 1111 0000 0000 0000
            case 0000000: // no file type specified - figure out the file type using alternative means
                return false;
            case 0040000:
                return NET_SFTP_TYPE_DIRECTORY;
            case 0100000:
                return NET_SFTP_TYPE_REGULAR;
            case 0120000:
                return NET_SFTP_TYPE_SYMLINK;
            // new types introduced in SFTPv5+
            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
            case 0010000: // named pipe (fifo)
                return NET_SFTP_TYPE_FIFO;
            case 0020000: // character special
                return NET_SFTP_TYPE_CHAR_DEVICE;
            case 0060000: // block special
                return NET_SFTP_TYPE_BLOCK_DEVICE;
            case 0140000: // socket
                return NET_SFTP_TYPE_SOCKET;
            case 0160000: // whiteout
                // "SPECIAL should be used for files that are of
                //  a known type which cannot be expressed in the protocol"
                return NET_SFTP_TYPE_SPECIAL;
            default:
                return NET_SFTP_TYPE_UNKNOWN;
        }
    }

    /**
     * Parse Longname
     *
     * SFTPv3 doesn't provide any easy way of identifying a file type.  You could try to open
     * a file as a directory and see if an error is returned or you could try to parse the
     * SFTPv3-specific longname field of the SSH_FXP_NAME packet.  That's what this function does.
     * The result is returned using the
     * {@link http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2 SFTPv4 type constants}.
     *
     * If the longname is in an unrecognized format bool(false) is returned.
     *
     * @param string $longname
     * @return mixed
     * @access private
     */
    function _parseLongname($longname)
    {
        // http://en.wikipedia.org/wiki/Unix_file_types
        // http://en.wikipedia.org/wiki/Filesystem_permissions#Notation_of_traditional_Unix_permissions
        if (preg_match('#^[^/]([r-][w-][xstST-]){3}#', $longname)) {
            switch ($longname[0]) {
                case '-':
                    return NET_SFTP_TYPE_REGULAR;
                case 'd':
                    return NET_SFTP_TYPE_DIRECTORY;
                case 'l':
                    return NET_SFTP_TYPE_SYMLINK;
                default:
                    return NET_SFTP_TYPE_SPECIAL;
            }
        }

        return false;
    }

    /**
     * Sends SFTP Packets
     *
     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
     *
     * @param int $type
     * @param string $data
     * @see self::_get_sftp_packet()
     * @see Net_SSH2::_send_channel_packet()
     * @return bool
     * @access private
     */
    function _send_sftp_packet($type, $data, $request_id = 1)
    {
        $packet = $this->use_request_id ?
            pack('NCNa*', strlen($data) + 5, $type, $request_id, $data) :
            pack('NCa*', strlen($data) + 1, $type, $data);

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
        $result = $this->_send_channel_packet(NET_SFTP_CHANNEL, $packet);
        $stop = strtok(microtime(), ' ') + strtok('');

        if (defined('NET_SFTP_LOGGING')) {
            $packet_type = '-> ' . $this->packet_types[$type] .
                           ' (' . round($stop - $start, 4) . 's)';
            if (NET_SFTP_LOGGING == NET_SFTP_LOG_REALTIME) {
                echo "
\r\n" . $this->_format_log(array($data), array($packet_type)) . "\r\n
\r\n";
                flush();
                ob_flush();
            } else {
                $this->packet_type_log[] = $packet_type;
                if (NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX) {
                    $this->packet_log[] = $data;
                }
            }
        }

        return $result;
    }

    /**
     * Resets a connection for re-use
     *
     * @param int $reason
     * @access private
     */
    function _reset_connection($reason)
    {
        parent::_reset_connection($reason);
        $this->use_request_id = false;
        $this->pwd = false;
        $this->requestBuffer = array();
    }

    /**
     * Receives SFTP Packets
     *
     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
     *
     * Incidentally, the number of SSH_MSG_CHANNEL_DATA messages has no bearing on the number of SFTP packets present.
     * There can be one SSH_MSG_CHANNEL_DATA messages containing two SFTP packets or there can be two SSH_MSG_CHANNEL_DATA
     * messages containing one SFTP packet.
     *
     * @see self::_send_sftp_packet()
     * @return string
     * @access private
     */
    function _get_sftp_packet($request_id = null)
    {
        if (isset($request_id) && isset($this->requestBuffer[$request_id])) {
            $this->packet_type = $this->requestBuffer[$request_id]['packet_type'];
            $temp = $this->requestBuffer[$request_id]['packet'];
            unset($this->requestBuffer[$request_id]);
            return $temp;
        }

        // in SSH2.php the timeout is cumulative per function call. eg. exec() will
        // timeout after 10s. but for SFTP.php it's cumulative per packet
        $this->curTimeout = $this->timeout;

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838

        // SFTP packet length
        while (strlen($this->packet_buffer) < 4) {
            $temp = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
            if (is_bool($temp)) {
                $this->packet_type = false;
                $this->packet_buffer = '';
                return false;
            }
            $this->packet_buffer.= $temp;
        }
        if (strlen($this->packet_buffer) < 4) {
            return false;
        }
        extract(unpack('Nlength', $this->_string_shift($this->packet_buffer, 4)));
        $tempLength = $length;
        $tempLength-= strlen($this->packet_buffer);


        // 256 * 1024 is what SFTP_MAX_MSG_LENGTH is set to in OpenSSH's sftp-common.h
        if ($tempLength > 256 * 1024) {
            user_error('Invalid SFTP packet size');
            return false;
        }

        // SFTP packet type and data payload
        while ($tempLength > 0) {
            $temp = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
            if (is_bool($temp)) {
                $this->packet_type = false;
                $this->packet_buffer = '';
                return false;
            }
            $this->packet_buffer.= $temp;
            $tempLength-= strlen($temp);
        }

        $stop = strtok(microtime(), ' ') + strtok('');

        $this->packet_type = ord($this->_string_shift($this->packet_buffer));

        if ($this->use_request_id) {
            extract(unpack('Npacket_id', $this->_string_shift($this->packet_buffer, 4))); // remove the request id
            $length-= 5; // account for the request id and the packet type
        } else {
            $length-= 1; // account for the packet type
        }

        $packet = $this->_string_shift($this->packet_buffer, $length);

        if (defined('NET_SFTP_LOGGING')) {
            $packet_type = '<- ' . $this->packet_types[$this->packet_type] .
                           ' (' . round($stop - $start, 4) . 's)';
            if (NET_SFTP_LOGGING == NET_SFTP_LOG_REALTIME) {
                echo "
\r\n" . $this->_format_log(array($packet), array($packet_type)) . "\r\n
\r\n";
                flush();
                ob_flush();
            } else {
                $this->packet_type_log[] = $packet_type;
                if (NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX) {
                    $this->packet_log[] = $packet;
                }
            }
        }

        if (isset($request_id) && $this->use_request_id && $packet_id != $request_id) {
            $this->requestBuffer[$packet_id] = array(
                'packet_type' => $this->packet_type,
                'packet' => $packet
            );
            return $this->_get_sftp_packet($request_id);
        }

        return $packet;
    }

    /**
     * Returns a log of the packets that have been sent and received.
     *
     * Returns a string if NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX, an array if NET_SFTP_LOGGING == NET_SFTP_LOG_SIMPLE and false if !defined('NET_SFTP_LOGGING')
     *
     * @access public
     * @return string or Array
     */
    function getSFTPLog()
    {
        if (!defined('NET_SFTP_LOGGING')) {
            return false;
        }

        switch (NET_SFTP_LOGGING) {
            case NET_SFTP_LOG_COMPLEX:
                return $this->_format_log($this->packet_log, $this->packet_type_log);
                break;
            //case NET_SFTP_LOG_SIMPLE:
            default:
                return $this->packet_type_log;
        }
    }

    /**
     * Returns all errors
     *
     * @return array
     * @access public
     */
    function getSFTPErrors()
    {
        return $this->sftp_errors;
    }

    /**
     * Returns the last error
     *
     * @return string
     * @access public
     */
    function getLastSFTPError()
    {
        return count($this->sftp_errors) ? $this->sftp_errors[count($this->sftp_errors) - 1] : '';
    }

    /**
     * Get supported SFTP versions
     *
     * @return array
     * @access public
     */
    function getSupportedVersions()
    {
        $temp = array('version' => $this->version);
        if (isset($this->extensions['versions'])) {
            $temp['extensions'] = $this->extensions['versions'];
        }
        return $temp;
    }

    /**
     * Disconnect
     *
     * @param int $reason
     * @return bool
     * @access private
     */
    function _disconnect($reason)
    {
        $this->pwd = false;
        parent::_disconnect($reason);
    }
}
phpseclib-1.0.18/phpseclib/Net/SFTP/000077500000000000000000000000001354156543400170375ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/Net/SFTP/Stream.php000066400000000000000000000550401354156543400210070ustar00rootroot00000000000000
 * @copyright 2013 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**
 * SFTP Stream Wrapper
 *
 * @package Net_SFTP_Stream
 * @author  Jim Wigginton 
 * @access  public
 */
class Net_SFTP_Stream
{
    /**
     * SFTP instances
     *
     * Rather than re-create the connection we re-use instances if possible
     *
     * @var array
     */
    static $instances;

    /**
     * SFTP instance
     *
     * @var object
     * @access private
     */
    var $sftp;

    /**
     * Path
     *
     * @var string
     * @access private
     */
    var $path;

    /**
     * Mode
     *
     * @var string
     * @access private
     */
    var $mode;

    /**
     * Position
     *
     * @var int
     * @access private
     */
    var $pos;

    /**
     * Size
     *
     * @var int
     * @access private
     */
    var $size;

    /**
     * Directory entries
     *
     * @var array
     * @access private
     */
    var $entries;

    /**
     * EOF flag
     *
     * @var bool
     * @access private
     */
    var $eof;

    /**
     * Context resource
     *
     * Technically this needs to be publically accessible so PHP can set it directly
     *
     * @var resource
     * @access public
     */
    var $context;

    /**
     * Notification callback function
     *
     * @var callable
     * @access public
     */
    var $notification;

    /**
     * Registers this class as a URL wrapper.
     *
     * @param string $protocol The wrapper name to be registered.
     * @return bool True on success, false otherwise.
     * @access public
     */
    static function register($protocol = 'sftp')
    {
        if (in_array($protocol, stream_get_wrappers(), true)) {
            return false;
        }
        $class = function_exists('get_called_class') ? get_called_class() : __CLASS__;
        return stream_wrapper_register($protocol, $class);
    }

    /**
     * The Constructor
     *
     * @access public
     */
    function __construct()
    {
        if (defined('NET_SFTP_STREAM_LOGGING')) {
            echo "__construct()\r\n";
        }

        if (!class_exists('Net_SFTP')) {
            include_once 'Net/SFTP.php';
        }
    }

    /**
     * Path Parser
     *
     * Extract a path from a URI and actually connect to an SSH server if appropriate
     *
     * If "notification" is set as a context parameter the message code for successful login is
     * NET_SSH2_MSG_USERAUTH_SUCCESS. For a failed login it's NET_SSH2_MSG_USERAUTH_FAILURE.
     *
     * @param string $path
     * @return string
     * @access private
     */
    function _parse_path($path)
    {
        $orig = $path;
        extract(parse_url($path) + array('port' => 22));
        if (isset($query)) {
            $path.= '?' . $query;
        } elseif (preg_match('/(\?|\?#)$/', $orig)) {
            $path.= '?';
        }
        if (isset($fragment)) {
            $path.= '#' . $fragment;
        } elseif ($orig[strlen($orig) - 1] == '#') {
            $path.= '#';
        }

        if (!isset($host)) {
            return false;
        }

        if (isset($this->context)) {
            $context = stream_context_get_params($this->context);
            if (isset($context['notification'])) {
                $this->notification = $context['notification'];
            }
        }

        if ($host[0] == '$') {
            $host = substr($host, 1);
            global ${$host};
            if (!is_object($$host) || get_class($$host) != 'Net_SFTP') {
                return false;
            }
            $this->sftp = $$host;
        } else {
            if (isset($this->context)) {
                $context = stream_context_get_options($this->context);
            }
            if (isset($context[$scheme]['session'])) {
                $sftp = $context[$scheme]['session'];
            }
            if (isset($context[$scheme]['sftp'])) {
                $sftp = $context[$scheme]['sftp'];
            }
            if (isset($sftp) && is_object($sftp) && get_class($sftp) == 'Net_SFTP') {
                $this->sftp = $sftp;
                return $path;
            }
            if (isset($context[$scheme]['username'])) {
                $user = $context[$scheme]['username'];
            }
            if (isset($context[$scheme]['password'])) {
                $pass = $context[$scheme]['password'];
            }
            if (isset($context[$scheme]['privkey']) && is_object($context[$scheme]['privkey']) && get_Class($context[$scheme]['privkey']) == 'Crypt_RSA') {
                $pass = $context[$scheme]['privkey'];
            }

            if (!isset($user) || !isset($pass)) {
                return false;
            }

            // casting $pass to a string is necessary in the event that it's a Crypt_RSA object
            if (isset(self::$instances[$host][$port][$user][(string) $pass])) {
                $this->sftp = self::$instances[$host][$port][$user][(string) $pass];
            } else {
                $this->sftp = new Net_SFTP($host, $port);
                $this->sftp->disableStatCache();
                if (isset($this->notification) && is_callable($this->notification)) {
                    /* if !is_callable($this->notification) we could do this:

                       user_error('fopen(): failed to call user notifier', E_USER_WARNING);

                       the ftp wrapper gives errors like that when the notifier isn't callable.
                       i've opted not to do that, however, since the ftp wrapper gives the line
                       on which the fopen occurred as the line number - not the line that the
                       user_error is on.
                    */
                    call_user_func($this->notification, STREAM_NOTIFY_CONNECT, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_REQUIRED, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
                    if (!$this->sftp->login($user, $pass)) {
                        call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_ERR, 'Login Failure', NET_SSH2_MSG_USERAUTH_FAILURE, 0, 0);
                        return false;
                    }
                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_INFO, 'Login Success', NET_SSH2_MSG_USERAUTH_SUCCESS, 0, 0);
                } else {
                    if (!$this->sftp->login($user, $pass)) {
                        return false;
                    }
                }
                self::$instances[$host][$port][$user][(string) $pass] = $this->sftp;
            }
        }

        return $path;
    }

    /**
     * Opens file or URL
     *
     * @param string $path
     * @param string $mode
     * @param int $options
     * @param string $opened_path
     * @return bool
     * @access public
     */
    function _stream_open($path, $mode, $options, &$opened_path)
    {
        $path = $this->_parse_path($path);

        if ($path === false) {
            return false;
        }
        $this->path = $path;

        $this->size = $this->sftp->size($path);
        $this->mode = preg_replace('#[bt]$#', '', $mode);
        $this->eof = false;

        if ($this->size === false) {
            if ($this->mode[0] == 'r') {
                return false;
            } else {
                $this->sftp->touch($path);
                $this->size = 0;
            }
        } else {
            switch ($this->mode[0]) {
                case 'x':
                    return false;
                case 'w':
                    $this->sftp->truncate($path, 0);
                    $this->size = 0;
            }
        }

        $this->pos = $this->mode[0] != 'a' ? 0 : $this->size;

        return true;
    }

    /**
     * Read from stream
     *
     * @param int $count
     * @return mixed
     * @access public
     */
    function _stream_read($count)
    {
        switch ($this->mode) {
            case 'w':
            case 'a':
            case 'x':
            case 'c':
                return false;
        }

        // commented out because some files - eg. /dev/urandom - will say their size is 0 when in fact it's kinda infinite
        //if ($this->pos >= $this->size) {
        //    $this->eof = true;
        //    return false;
        //}

        $result = $this->sftp->get($this->path, false, $this->pos, $count);
        if (isset($this->notification) && is_callable($this->notification)) {
            if ($result === false) {
                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
                return 0;
            }
            // seems that PHP calls stream_read in 8k chunks
            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($result), $this->size);
        }

        if (empty($result)) { // ie. false or empty string
            $this->eof = true;
            return false;
        }
        $this->pos+= strlen($result);

        return $result;
    }

    /**
     * Write to stream
     *
     * @param string $data
     * @return mixed
     * @access public
     */
    function _stream_write($data)
    {
        switch ($this->mode) {
            case 'r':
                return false;
        }

        $result = $this->sftp->put($this->path, $data, NET_SFTP_STRING, $this->pos);
        if (isset($this->notification) && is_callable($this->notification)) {
            if (!$result) {
                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
                return 0;
            }
            // seems that PHP splits up strings into 8k blocks before calling stream_write
            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($data), strlen($data));
        }

        if ($result === false) {
            return false;
        }
        $this->pos+= strlen($data);
        if ($this->pos > $this->size) {
            $this->size = $this->pos;
        }
        $this->eof = false;
        return strlen($data);
    }

    /**
     * Retrieve the current position of a stream
     *
     * @return int
     * @access public
     */
    function _stream_tell()
    {
        return $this->pos;
    }

    /**
     * Tests for end-of-file on a file pointer
     *
     * In my testing there are four classes functions that normally effect the pointer:
     * fseek, fputs  / fwrite, fgets / fread and ftruncate.
     *
     * Only fgets / fread, however, results in feof() returning true. do fputs($fp, 'aaa') on a blank file and feof()
     * will return false. do fread($fp, 1) and feof() will then return true. do fseek($fp, 10) on ablank file and feof()
     * will return false. do fread($fp, 1) and feof() will then return true.
     *
     * @return bool
     * @access public
     */
    function _stream_eof()
    {
        return $this->eof;
    }

    /**
     * Seeks to specific location in a stream
     *
     * @param int $offset
     * @param int $whence
     * @return bool
     * @access public
     */
    function _stream_seek($offset, $whence)
    {
        switch ($whence) {
            case SEEK_SET:
                if ($offset >= $this->size || $offset < 0) {
                    return false;
                }
                break;
            case SEEK_CUR:
                $offset+= $this->pos;
                break;
            case SEEK_END:
                $offset+= $this->size;
        }

        $this->pos = $offset;
        $this->eof = false;
        return true;
    }

    /**
     * Change stream options
     *
     * @param string $path
     * @param int $option
     * @param mixed $var
     * @return bool
     * @access public
     */
    function _stream_metadata($path, $option, $var)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }

        // stream_metadata was introduced in PHP 5.4.0 but as of 5.4.11 the constants haven't been defined
        // see http://www.php.net/streamwrapper.stream-metadata and https://bugs.php.net/64246
        //     and https://github.com/php/php-src/blob/master/main/php_streams.h#L592
        switch ($option) {
            case 1: // PHP_STREAM_META_TOUCH
                return $this->sftp->touch($path, $var[0], $var[1]);
            case 2: // PHP_STREAM_OWNER_NAME
            case 3: // PHP_STREAM_GROUP_NAME
                return false;
            case 4: // PHP_STREAM_META_OWNER
                return $this->sftp->chown($path, $var);
            case 5: // PHP_STREAM_META_GROUP
                return $this->sftp->chgrp($path, $var);
            case 6: // PHP_STREAM_META_ACCESS
                return $this->sftp->chmod($path, $var) !== false;
        }
    }

    /**
     * Retrieve the underlaying resource
     *
     * @param int $cast_as
     * @return resource
     * @access public
     */
    function _stream_cast($cast_as)
    {
        return $this->sftp->fsock;
    }

    /**
     * Advisory file locking
     *
     * @param int $operation
     * @return bool
     * @access public
     */
    function _stream_lock($operation)
    {
        return false;
    }

    /**
     * Renames a file or directory
     *
     * Attempts to rename oldname to newname, moving it between directories if necessary.
     * If newname exists, it will be overwritten.  This is a departure from what Net_SFTP
     * does.
     *
     * @param string $path_from
     * @param string $path_to
     * @return bool
     * @access public
     */
    function _rename($path_from, $path_to)
    {
        $path1 = parse_url($path_from);
        $path2 = parse_url($path_to);
        unset($path1['path'], $path2['path']);
        if ($path1 != $path2) {
            return false;
        }

        $path_from = $this->_parse_path($path_from);
        $path_to = parse_url($path_to);
        if ($path_from === false) {
            return false;
        }

        $path_to = $path_to['path']; // the $component part of parse_url() was added in PHP 5.1.2
        // "It is an error if there already exists a file with the name specified by newpath."
        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-6.5
        if (!$this->sftp->rename($path_from, $path_to)) {
            if ($this->sftp->stat($path_to)) {
                return $this->sftp->delete($path_to, true) && $this->sftp->rename($path_from, $path_to);
            }
            return false;
        }

        return true;
    }

    /**
     * Open directory handle
     *
     * The only $options is "whether or not to enforce safe_mode (0x04)". Since safe mode was deprecated in 5.3 and
     * removed in 5.4 I'm just going to ignore it.
     *
     * Also, nlist() is the best that this function is realistically going to be able to do. When an SFTP client
     * sends a SSH_FXP_READDIR packet you don't generally get info on just one file but on multiple files. Quoting
     * the SFTP specs:
     *
     *    The SSH_FXP_NAME response has the following format:
     *
     *        uint32     id
     *        uint32     count
     *        repeats count times:
     *                string     filename
     *                string     longname
     *                ATTRS      attrs
     *
     * @param string $path
     * @param int $options
     * @return bool
     * @access public
     */
    function _dir_opendir($path, $options)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }
        $this->pos = 0;
        $this->entries = $this->sftp->nlist($path);
        return $this->entries !== false;
    }

    /**
     * Read entry from directory handle
     *
     * @return mixed
     * @access public
     */
    function _dir_readdir()
    {
        if (isset($this->entries[$this->pos])) {
            return $this->entries[$this->pos++];
        }
        return false;
    }

    /**
     * Rewind directory handle
     *
     * @return bool
     * @access public
     */
    function _dir_rewinddir()
    {
        $this->pos = 0;
        return true;
    }

    /**
     * Close directory handle
     *
     * @return bool
     * @access public
     */
    function _dir_closedir()
    {
        return true;
    }

    /**
     * Create a directory
     *
     * Only valid $options is STREAM_MKDIR_RECURSIVE
     *
     * @param string $path
     * @param int $mode
     * @param int $options
     * @return bool
     * @access public
     */
    function _mkdir($path, $mode, $options)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }

        return $this->sftp->mkdir($path, $mode, $options & STREAM_MKDIR_RECURSIVE);
    }

    /**
     * Removes a directory
     *
     * Only valid $options is STREAM_MKDIR_RECURSIVE per , however,
     *   does not have a $recursive parameter as mkdir() does so I don't know how
     * STREAM_MKDIR_RECURSIVE is supposed to be set. Also, when I try it out with rmdir() I get 8 as
     * $options. What does 8 correspond to?
     *
     * @param string $path
     * @param int $mode
     * @param int $options
     * @return bool
     * @access public
     */
    function _rmdir($path, $options)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }

        return $this->sftp->rmdir($path);
    }

    /**
     * Flushes the output
     *
     * See . Always returns true because Net_SFTP doesn't cache stuff before writing
     *
     * @return bool
     * @access public
     */
    function _stream_flush()
    {
        return true;
    }

    /**
     * Retrieve information about a file resource
     *
     * @return mixed
     * @access public
     */
    function _stream_stat()
    {
        $results = $this->sftp->stat($this->path);
        if ($results === false) {
            return false;
        }
        return $results;
    }

    /**
     * Delete a file
     *
     * @param string $path
     * @return bool
     * @access public
     */
    function _unlink($path)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }

        return $this->sftp->delete($path, false);
    }

    /**
     * Retrieve information about a file
     *
     * Ignores the STREAM_URL_STAT_QUIET flag because the entirety of Net_SFTP_Stream is quiet by default
     * might be worthwhile to reconstruct bits 12-16 (ie. the file type) if mode doesn't have them but we'll
     * cross that bridge when and if it's reached
     *
     * @param string $path
     * @param int $flags
     * @return mixed
     * @access public
     */
    function _url_stat($path, $flags)
    {
        $path = $this->_parse_path($path);
        if ($path === false) {
            return false;
        }

        $results = $flags & STREAM_URL_STAT_LINK ? $this->sftp->lstat($path) : $this->sftp->stat($path);
        if ($results === false) {
            return false;
        }

        return $results;
    }

    /**
     * Truncate stream
     *
     * @param int $new_size
     * @return bool
     * @access public
     */
    function _stream_truncate($new_size)
    {
        if (!$this->sftp->truncate($this->path, $new_size)) {
            return false;
        }

        $this->eof = false;
        $this->size = $new_size;

        return true;
    }

    /**
     * Change stream options
     *
     * STREAM_OPTION_WRITE_BUFFER isn't supported for the same reason stream_flush isn't.
     * The other two aren't supported because of limitations in Net_SFTP.
     *
     * @param int $option
     * @param int $arg1
     * @param int $arg2
     * @return bool
     * @access public
     */
    function _stream_set_option($option, $arg1, $arg2)
    {
        return false;
    }

    /**
     * Close an resource
     *
     * @access public
     */
    function _stream_close()
    {
    }

    /**
     * __call Magic Method
     *
     * When you're utilizing an SFTP stream you're not calling the methods in this class directly - PHP is calling them for you.
     * Which kinda begs the question... what methods is PHP calling and what parameters is it passing to them? This function
     * lets you figure that out.
     *
     * If NET_SFTP_STREAM_LOGGING is defined all calls will be output on the screen and then (regardless of whether or not
     * NET_SFTP_STREAM_LOGGING is enabled) the parameters will be passed through to the appropriate method.
     *
     * @param string
     * @param array
     * @return mixed
     * @access public
     */
    function __call($name, $arguments)
    {
        if (defined('NET_SFTP_STREAM_LOGGING')) {
            echo $name . '(';
            $last = count($arguments) - 1;
            foreach ($arguments as $i => $argument) {
                var_export($argument);
                if ($i != $last) {
                    echo ',';
                }
            }
            echo ")\r\n";
        }
        $name = '_' . $name;
        if (!method_exists($this, $name)) {
            return false;
        }
        return call_user_func_array(array($this, $name), $arguments);
    }
}

Net_SFTP_Stream::register();
phpseclib-1.0.18/phpseclib/Net/SSH1.php000066400000000000000000001532021354156543400175150ustar00rootroot00000000000000
 * login('username', 'password')) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $ssh->exec('ls -la');
 * ?>
 * 
 *
 * Here's another short example:
 * 
 * login('username', 'password')) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $ssh->read('username@username:~$');
 *    $ssh->write("ls -la\n");
 *    echo $ssh->read('username@username:~$');
 * ?>
 * 
 *
 * More information on the SSHv1 specification can be found by reading
 * {@link http://www.snailbook.com/docs/protocol-1.5.txt protocol-1.5.txt}.
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Net
 * @package   Net_SSH1
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * Encryption Methods
 *
 * @see self::getSupportedCiphers()
 * @access public
 */
/**
 * No encryption
 *
 * Not supported.
 */
define('NET_SSH1_CIPHER_NONE',       0);
/**
 * IDEA in CFB mode
 *
 * Not supported.
 */
define('NET_SSH1_CIPHER_IDEA',       1);
/**
 * DES in CBC mode
 */
define('NET_SSH1_CIPHER_DES',        2);
/**
 * Triple-DES in CBC mode
 *
 * All implementations are required to support this
 */
define('NET_SSH1_CIPHER_3DES',       3);
/**
 * TRI's Simple Stream encryption CBC
 *
 * Not supported nor is it defined in the official SSH1 specs.  OpenSSH, however, does define it (see cipher.h),
 * although it doesn't use it (see cipher.c)
 */
define('NET_SSH1_CIPHER_BROKEN_TSS', 4);
/**
 * RC4
 *
 * Not supported.
 *
 * @internal According to the SSH1 specs:
 *
 *        "The first 16 bytes of the session key are used as the key for
 *         the server to client direction.  The remaining 16 bytes are used
 *         as the key for the client to server direction.  This gives
 *         independent 128-bit keys for each direction."
 *
 *     This library currently only supports encryption when the same key is being used for both directions.  This is
 *     because there's only one $crypto object.  Two could be added ($encrypt and $decrypt, perhaps).
 */
define('NET_SSH1_CIPHER_RC4',        5);
/**
 * Blowfish
 *
 * Not supported nor is it defined in the official SSH1 specs.  OpenSSH, however, defines it (see cipher.h) and
 * uses it (see cipher.c)
 */
define('NET_SSH1_CIPHER_BLOWFISH',   6);
/**#@-*/

/**#@+
 * Authentication Methods
 *
 * @see self::getSupportedAuthentications()
 * @access public
 */
/**
 * .rhosts or /etc/hosts.equiv
 */
define('NET_SSH1_AUTH_RHOSTS',     1);
/**
 * pure RSA authentication
 */
define('NET_SSH1_AUTH_RSA',        2);
/**
 * password authentication
 *
 * This is the only method that is supported by this library.
 */
define('NET_SSH1_AUTH_PASSWORD',   3);
/**
 * .rhosts with RSA host authentication
 */
define('NET_SSH1_AUTH_RHOSTS_RSA', 4);
/**#@-*/

/**#@+
 * Terminal Modes
 *
 * @link http://3sp.com/content/developer/maverick-net/docs/Maverick.SSH.PseudoTerminalModesMembers.html
 * @access private
 */
define('NET_SSH1_TTY_OP_END',  0);
/**#@-*/

/**
 * The Response Type
 *
 * @see self::_get_binary_packet()
 * @access private
 */
define('NET_SSH1_RESPONSE_TYPE', 1);

/**
 * The Response Data
 *
 * @see self::_get_binary_packet()
 * @access private
 */
define('NET_SSH1_RESPONSE_DATA', 2);

/**#@+
 * Execution Bitmap Masks
 *
 * @see self::bitmap
 * @access private
 */
define('NET_SSH1_MASK_CONSTRUCTOR', 0x00000001);
define('NET_SSH1_MASK_CONNECTED',   0x00000002);
define('NET_SSH1_MASK_LOGIN',       0x00000004);
define('NET_SSH1_MASK_SHELL',       0x00000008);
/**#@-*/

/**#@+
 * @access public
 * @see self::getLog()
 */
/**
 * Returns the message numbers
 */
define('NET_SSH1_LOG_SIMPLE',  1);
/**
 * Returns the message content
 */
define('NET_SSH1_LOG_COMPLEX', 2);
/**
 * Outputs the content real-time
 */
define('NET_SSH1_LOG_REALTIME', 3);
/**
 * Dumps the content real-time to a file
 */
define('NET_SSH1_LOG_REALTIME_FILE', 4);
/**#@-*/

/**#@+
 * @access public
 * @see self::read()
 */
/**
 * Returns when a string matching $expect exactly is found
 */
define('NET_SSH1_READ_SIMPLE',  1);
/**
 * Returns when a string matching the regular expression $expect is found
 */
define('NET_SSH1_READ_REGEX', 2);
/**#@-*/

/**
 * Pure-PHP implementation of SSHv1.
 *
 * @package Net_SSH1
 * @author  Jim Wigginton 
 * @access  public
 */
class Net_SSH1
{
    /**
     * The SSH identifier
     *
     * @var string
     * @access private
     */
    var $identifier = 'SSH-1.5-phpseclib';

    /**
     * The Socket Object
     *
     * @var object
     * @access private
     */
    var $fsock;

    /**
     * The cryptography object
     *
     * @var object
     * @access private
     */
    var $crypto = false;

    /**
     * Execution Bitmap
     *
     * The bits that are set represent functions that have been called already.  This is used to determine
     * if a requisite function has been successfully executed.  If not, an error should be thrown.
     *
     * @var int
     * @access private
     */
    var $bitmap = 0;

    /**
     * The Server Key Public Exponent
     *
     * Logged for debug purposes
     *
     * @see self::getServerKeyPublicExponent()
     * @var string
     * @access private
     */
    var $server_key_public_exponent;

    /**
     * The Server Key Public Modulus
     *
     * Logged for debug purposes
     *
     * @see self::getServerKeyPublicModulus()
     * @var string
     * @access private
     */
    var $server_key_public_modulus;

    /**
     * The Host Key Public Exponent
     *
     * Logged for debug purposes
     *
     * @see self::getHostKeyPublicExponent()
     * @var string
     * @access private
     */
    var $host_key_public_exponent;

    /**
     * The Host Key Public Modulus
     *
     * Logged for debug purposes
     *
     * @see self::getHostKeyPublicModulus()
     * @var string
     * @access private
     */
    var $host_key_public_modulus;

    /**
     * Supported Ciphers
     *
     * Logged for debug purposes
     *
     * @see self::getSupportedCiphers()
     * @var array
     * @access private
     */
    var $supported_ciphers = array(
        NET_SSH1_CIPHER_NONE       => 'No encryption',
        NET_SSH1_CIPHER_IDEA       => 'IDEA in CFB mode',
        NET_SSH1_CIPHER_DES        => 'DES in CBC mode',
        NET_SSH1_CIPHER_3DES       => 'Triple-DES in CBC mode',
        NET_SSH1_CIPHER_BROKEN_TSS => 'TRI\'s Simple Stream encryption CBC',
        NET_SSH1_CIPHER_RC4        => 'RC4',
        NET_SSH1_CIPHER_BLOWFISH   => 'Blowfish'
    );

    /**
     * Supported Authentications
     *
     * Logged for debug purposes
     *
     * @see self::getSupportedAuthentications()
     * @var array
     * @access private
     */
    var $supported_authentications = array(
        NET_SSH1_AUTH_RHOSTS     => '.rhosts or /etc/hosts.equiv',
        NET_SSH1_AUTH_RSA        => 'pure RSA authentication',
        NET_SSH1_AUTH_PASSWORD   => 'password authentication',
        NET_SSH1_AUTH_RHOSTS_RSA => '.rhosts with RSA host authentication'
    );

    /**
     * Server Identification
     *
     * @see self::getServerIdentification()
     * @var string
     * @access private
     */
    var $server_identification = '';

    /**
     * Protocol Flags
     *
     * @see self::Net_SSH1()
     * @var array
     * @access private
     */
    var $protocol_flags = array();

    /**
     * Protocol Flag Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $protocol_flag_log = array();

    /**
     * Message Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $message_log = array();

    /**
     * Real-time log file pointer
     *
     * @see self::_append_log()
     * @var resource
     * @access private
     */
    var $realtime_log_file;

    /**
     * Real-time log file size
     *
     * @see self::_append_log()
     * @var int
     * @access private
     */
    var $realtime_log_size;

    /**
     * Real-time log file wrap boolean
     *
     * @see self::_append_log()
     * @var bool
     * @access private
     */
    var $realtime_log_wrap;

    /**
     * Interactive Buffer
     *
     * @see self::read()
     * @var array
     * @access private
     */
    var $interactiveBuffer = '';

    /**
     * Timeout
     *
     * @see self::setTimeout()
     * @access private
     */
    var $timeout;

    /**
     * Current Timeout
     *
     * @see self::_get_channel_packet()
     * @access private
     */
    var $curTimeout;

    /**
     * Log Boundary
     *
     * @see self::_format_log()
     * @access private
     */
    var $log_boundary = ':';

    /**
     * Log Long Width
     *
     * @see self::_format_log()
     * @access private
     */
    var $log_long_width = 65;

    /**
     * Log Short Width
     *
     * @see self::_format_log()
     * @access private
     */
    var $log_short_width = 16;

    /**
     * Hostname
     *
     * @see self::Net_SSH1()
     * @see self::_connect()
     * @var string
     * @access private
     */
    var $host;

    /**
     * Port Number
     *
     * @see self::Net_SSH1()
     * @see self::_connect()
     * @var int
     * @access private
     */
    var $port;

    /**
     * Timeout for initial connection
     *
     * Set by the constructor call. Calling setTimeout() is optional. If it's not called functions like
     * exec() won't timeout unless some PHP setting forces it too. The timeout specified in the constructor,
     * however, is non-optional. There will be a timeout, whether or not you set it. If you don't it'll be
     * 10 seconds. It is used by fsockopen() in that function.
     *
     * @see self::Net_SSH1()
     * @see self::_connect()
     * @var int
     * @access private
     */
    var $connectionTimeout;

    /**
     * Default cipher
     *
     * @see self::Net_SSH1()
     * @see self::_connect()
     * @var int
     * @access private
     */
    var $cipher;

    /**
     * Default Constructor.
     *
     * Connects to an SSHv1 server
     *
     * @param string $host
     * @param int $port
     * @param int $timeout
     * @param int $cipher
     * @return Net_SSH1
     * @access public
     */
    function __construct($host, $port = 22, $timeout = 10, $cipher = NET_SSH1_CIPHER_3DES)
    {
        if (!class_exists('Math_BigInteger')) {
            include_once 'Math/BigInteger.php';
        }

        // Include Crypt_Random
        // the class_exists() will only be called if the crypt_random_string function hasn't been defined and
        // will trigger a call to __autoload() if you're wanting to auto-load classes
        // call function_exists() a second time to stop the include_once from being called outside
        // of the auto loader
        if (!function_exists('crypt_random_string') && !class_exists('Crypt_Random') && !function_exists('crypt_random_string')) {
            include_once 'Crypt/Random.php';
        }

        $this->protocol_flags = array(
            1  => 'NET_SSH1_MSG_DISCONNECT',
            2  => 'NET_SSH1_SMSG_PUBLIC_KEY',
            3  => 'NET_SSH1_CMSG_SESSION_KEY',
            4  => 'NET_SSH1_CMSG_USER',
            9  => 'NET_SSH1_CMSG_AUTH_PASSWORD',
            10 => 'NET_SSH1_CMSG_REQUEST_PTY',
            12 => 'NET_SSH1_CMSG_EXEC_SHELL',
            13 => 'NET_SSH1_CMSG_EXEC_CMD',
            14 => 'NET_SSH1_SMSG_SUCCESS',
            15 => 'NET_SSH1_SMSG_FAILURE',
            16 => 'NET_SSH1_CMSG_STDIN_DATA',
            17 => 'NET_SSH1_SMSG_STDOUT_DATA',
            18 => 'NET_SSH1_SMSG_STDERR_DATA',
            19 => 'NET_SSH1_CMSG_EOF',
            20 => 'NET_SSH1_SMSG_EXITSTATUS',
            33 => 'NET_SSH1_CMSG_EXIT_CONFIRMATION'
        );

        $this->_define_array($this->protocol_flags);

        $this->host = $host;
        $this->port = $port;
        $this->connectionTimeout = $timeout;
        $this->cipher = $cipher;
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param string $host
     * @param int $port
     * @param int $timeout
     * @param int $cipher
     * @access public
     */
    function Net_SSH1($host, $port = 22, $timeout = 10, $cipher = NET_SSH1_CIPHER_3DES)
    {
        $this->__construct($host, $port, $timeout, $cipher);
    }

    /**
     * Connect to an SSHv1 server
     *
     * @return bool
     * @access private
     */
    function _connect()
    {
        $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->connectionTimeout);
        if (!$this->fsock) {
            user_error(rtrim("Cannot connect to {$this->host}:{$this->port}. Error $errno. $errstr"));
            return false;
        }

        $this->server_identification = $init_line = fgets($this->fsock, 255);

        if (defined('NET_SSH1_LOGGING')) {
            $this->_append_log('<-', $this->server_identification);
            $this->_append_log('->', $this->identifier . "\r\n");
        }

        if (!preg_match('#SSH-([0-9\.]+)-(.+)#', $init_line, $parts)) {
            user_error('Can only connect to SSH servers');
            return false;
        }
        if ($parts[1][0] != 1) {
            user_error("Cannot connect to SSH $parts[1] servers");
            return false;
        }

        fputs($this->fsock, $this->identifier."\r\n");

        $response = $this->_get_binary_packet();
        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_PUBLIC_KEY) {
            user_error('Expected SSH_SMSG_PUBLIC_KEY');
            return false;
        }

        $anti_spoofing_cookie = $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 8);

        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);

        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
            return false;
        }
        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
        $server_key_public_exponent = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
        $this->server_key_public_exponent = $server_key_public_exponent;

        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
            return false;
        }
        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
        $server_key_public_modulus = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
        $this->server_key_public_modulus = $server_key_public_modulus;

        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);

        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
            return false;
        }
        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
        $host_key_public_exponent = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
        $this->host_key_public_exponent = $host_key_public_exponent;

        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
            return false;
        }
        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
        $host_key_public_modulus = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
        $this->host_key_public_modulus = $host_key_public_modulus;

        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);

        // get a list of the supported ciphers
        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
            return false;
        }
        extract(unpack('Nsupported_ciphers_mask', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4)));
        foreach ($this->supported_ciphers as $mask => $name) {
            if (($supported_ciphers_mask & (1 << $mask)) == 0) {
                unset($this->supported_ciphers[$mask]);
            }
        }

        // get a list of the supported authentications
        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
            return false;
        }
        extract(unpack('Nsupported_authentications_mask', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4)));
        foreach ($this->supported_authentications as $mask => $name) {
            if (($supported_authentications_mask & (1 << $mask)) == 0) {
                unset($this->supported_authentications[$mask]);
            }
        }

        $session_id = pack('H*', md5($host_key_public_modulus->toBytes() . $server_key_public_modulus->toBytes() . $anti_spoofing_cookie));

        $session_key = crypt_random_string(32);
        $double_encrypted_session_key = $session_key ^ str_pad($session_id, 32, chr(0));

        if ($server_key_public_modulus->compare($host_key_public_modulus) < 0) {
            $double_encrypted_session_key = $this->_rsa_crypt(
                $double_encrypted_session_key,
                array(
                    $server_key_public_exponent,
                    $server_key_public_modulus
                )
            );
            $double_encrypted_session_key = $this->_rsa_crypt(
                $double_encrypted_session_key,
                array(
                    $host_key_public_exponent,
                    $host_key_public_modulus
                )
            );
        } else {
            $double_encrypted_session_key = $this->_rsa_crypt(
                $double_encrypted_session_key,
                array(
                    $host_key_public_exponent,
                    $host_key_public_modulus
                )
            );
            $double_encrypted_session_key = $this->_rsa_crypt(
                $double_encrypted_session_key,
                array(
                    $server_key_public_exponent,
                    $server_key_public_modulus
                )
            );
        }

        $cipher = isset($this->supported_ciphers[$this->cipher]) ? $this->cipher : NET_SSH1_CIPHER_3DES;
        $data = pack('C2a*na*N', NET_SSH1_CMSG_SESSION_KEY, $cipher, $anti_spoofing_cookie, 8 * strlen($double_encrypted_session_key), $double_encrypted_session_key, 0);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_SESSION_KEY');
            return false;
        }

        switch ($cipher) {
            //case NET_SSH1_CIPHER_NONE:
            //    $this->crypto = new Crypt_Null();
            //    break;
            case NET_SSH1_CIPHER_DES:
                if (!class_exists('Crypt_DES')) {
                    include_once 'Crypt/DES.php';
                }
                $this->crypto = new Crypt_DES();
                $this->crypto->disablePadding();
                $this->crypto->enableContinuousBuffer();
                $this->crypto->setKey(substr($session_key, 0, 8));
                break;
            case NET_SSH1_CIPHER_3DES:
                if (!class_exists('Crypt_TripleDES')) {
                    include_once 'Crypt/TripleDES.php';
                }
                $this->crypto = new Crypt_TripleDES(CRYPT_DES_MODE_3CBC);
                $this->crypto->disablePadding();
                $this->crypto->enableContinuousBuffer();
                $this->crypto->setKey(substr($session_key, 0, 24));
                break;
            //case NET_SSH1_CIPHER_RC4:
            //    if (!class_exists('Crypt_RC4')) {
            //        include_once 'Crypt/RC4.php';
            //    }
            //    $this->crypto = new Crypt_RC4();
            //    $this->crypto->enableContinuousBuffer();
            //    $this->crypto->setKey(substr($session_key, 0,  16));
            //    break;
        }

        $response = $this->_get_binary_packet();

        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
            user_error('Expected SSH_SMSG_SUCCESS');
            return false;
        }

        $this->bitmap = NET_SSH1_MASK_CONNECTED;

        return true;
    }

    /**
     * Login
     *
     * @param string $username
     * @param string $password
     * @return bool
     * @access public
     */
    function login($username, $password = '')
    {
        if (!($this->bitmap & NET_SSH1_MASK_CONSTRUCTOR)) {
            $this->bitmap |= NET_SSH1_MASK_CONSTRUCTOR;
            if (!$this->_connect()) {
                return false;
            }
        }

        if (!($this->bitmap & NET_SSH1_MASK_CONNECTED)) {
            return false;
        }

        $data = pack('CNa*', NET_SSH1_CMSG_USER, strlen($username), $username);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_USER');
            return false;
        }

        $response = $this->_get_binary_packet();

        if ($response === true) {
            return false;
        }
        if ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
            $this->bitmap |= NET_SSH1_MASK_LOGIN;
            return true;
        } elseif ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_FAILURE) {
            user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
            return false;
        }

        $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen($password), $password);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_AUTH_PASSWORD');
            return false;
        }

        // remove the username and password from the last logged packet
        if (defined('NET_SSH1_LOGGING') && NET_SSH1_LOGGING == NET_SSH1_LOG_COMPLEX) {
            $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen('password'), 'password');
            $this->message_log[count($this->message_log) - 1] = $data;
        }

        $response = $this->_get_binary_packet();

        if ($response === true) {
            return false;
        }
        if ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
            $this->bitmap |= NET_SSH1_MASK_LOGIN;
            return true;
        } elseif ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_FAILURE) {
            return false;
        } else {
            user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
            return false;
        }
    }

    /**
     * Set Timeout
     *
     * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely.  setTimeout() makes it so it'll timeout.
     * Setting $timeout to false or 0 will mean there is no timeout.
     *
     * @param mixed $timeout
     */
    function setTimeout($timeout)
    {
        $this->timeout = $this->curTimeout = $timeout;
    }

    /**
     * Executes a command on a non-interactive shell, returns the output, and quits.
     *
     * An SSH1 server will close the connection after a command has been executed on a non-interactive shell.  SSH2
     * servers don't, however, this isn't an SSH2 client.  The way this works, on the server, is by initiating a
     * shell with the -s option, as discussed in the following links:
     *
     * {@link http://www.faqs.org/docs/bashman/bashref_65.html http://www.faqs.org/docs/bashman/bashref_65.html}
     * {@link http://www.faqs.org/docs/bashman/bashref_62.html http://www.faqs.org/docs/bashman/bashref_62.html}
     *
     * To execute further commands, a new Net_SSH1 object will need to be created.
     *
     * Returns false on failure and the output, otherwise.
     *
     * @see self::interactiveRead()
     * @see self::interactiveWrite()
     * @param string $cmd
     * @return mixed
     * @access public
     */
    function exec($cmd, $block = true)
    {
        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        $data = pack('CNa*', NET_SSH1_CMSG_EXEC_CMD, strlen($cmd), $cmd);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_EXEC_CMD');
            return false;
        }

        if (!$block) {
            return true;
        }

        $output = '';
        $response = $this->_get_binary_packet();

        if ($response !== false) {
            do {
                $output.= substr($response[NET_SSH1_RESPONSE_DATA], 4);
                $response = $this->_get_binary_packet();
            } while (is_array($response) && $response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_EXITSTATUS);
        }

        $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);

        // i don't think it's really all that important if this packet gets sent or not.
        $this->_send_binary_packet($data);

        fclose($this->fsock);

        // reset the execution bitmap - a new Net_SSH1 object needs to be created.
        $this->bitmap = 0;

        return $output;
    }

    /**
     * Creates an interactive shell
     *
     * @see self::interactiveRead()
     * @see self::interactiveWrite()
     * @return bool
     * @access private
     */
    function _initShell()
    {
        // connect using the sample parameters in protocol-1.5.txt.
        // according to wikipedia.org's entry on text terminals, "the fundamental type of application running on a text
        // terminal is a command line interpreter or shell".  thus, opening a terminal session to run the shell.
        $data = pack('CNa*N4C', NET_SSH1_CMSG_REQUEST_PTY, strlen('vt100'), 'vt100', 24, 80, 0, 0, NET_SSH1_TTY_OP_END);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_REQUEST_PTY');
            return false;
        }

        $response = $this->_get_binary_packet();

        if ($response === true) {
            return false;
        }
        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
            user_error('Expected SSH_SMSG_SUCCESS');
            return false;
        }

        $data = pack('C', NET_SSH1_CMSG_EXEC_SHELL);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_EXEC_SHELL');
            return false;
        }

        $this->bitmap |= NET_SSH1_MASK_SHELL;

        //stream_set_blocking($this->fsock, 0);

        return true;
    }

    /**
     * Inputs a command into an interactive shell.
     *
     * @see self::interactiveWrite()
     * @param string $cmd
     * @return bool
     * @access public
     */
    function write($cmd)
    {
        return $this->interactiveWrite($cmd);
    }

    /**
     * Returns the output of an interactive shell when there's a match for $expect
     *
     * $expect can take the form of a string literal or, if $mode == NET_SSH1_READ_REGEX,
     * a regular expression.
     *
     * @see self::write()
     * @param string $expect
     * @param int $mode
     * @return bool
     * @access public
     */
    function read($expect, $mode = NET_SSH1_READ_SIMPLE)
    {
        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
            user_error('Unable to initiate an interactive shell session');
            return false;
        }

        $match = $expect;
        while (true) {
            if ($mode == NET_SSH1_READ_REGEX) {
                preg_match($expect, $this->interactiveBuffer, $matches);
                $match = isset($matches[0]) ? $matches[0] : '';
            }
            $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
            if ($pos !== false) {
                return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
            }
            $response = $this->_get_binary_packet();

            if ($response === true) {
                return $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer));
            }
            $this->interactiveBuffer.= substr($response[NET_SSH1_RESPONSE_DATA], 4);
        }
    }

    /**
     * Inputs a command into an interactive shell.
     *
     * @see self::interactiveRead()
     * @param string $cmd
     * @return bool
     * @access public
     */
    function interactiveWrite($cmd)
    {
        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
            user_error('Unable to initiate an interactive shell session');
            return false;
        }

        $data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($cmd), $cmd);

        if (!$this->_send_binary_packet($data)) {
            user_error('Error sending SSH_CMSG_STDIN');
            return false;
        }

        return true;
    }

    /**
     * Returns the output of an interactive shell when no more output is available.
     *
     * Requires PHP 4.3.0 or later due to the use of the stream_select() function.  If you see stuff like
     * "^[[00m", you're seeing ANSI escape codes.  According to
     * {@link http://support.microsoft.com/kb/101875 How to Enable ANSI.SYS in a Command Window}, "Windows NT
     * does not support ANSI escape sequences in Win32 Console applications", so if you're a Windows user,
     * there's not going to be much recourse.
     *
     * @see self::interactiveRead()
     * @return string
     * @access public
     */
    function interactiveRead()
    {
        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
            user_error('Unable to initiate an interactive shell session');
            return false;
        }

        $read = array($this->fsock);
        $write = $except = null;
        if (stream_select($read, $write, $except, 0)) {
            $response = $this->_get_binary_packet();
            return substr($response[NET_SSH1_RESPONSE_DATA], 4);
        } else {
            return '';
        }
    }

    /**
     * Disconnect
     *
     * @access public
     */
    function disconnect()
    {
        $this->_disconnect();
    }

    /**
     * Destructor.
     *
     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
     * disconnect().
     *
     * @access public
     */
    function __destruct()
    {
        $this->_disconnect();
    }

    /**
     * Disconnect
     *
     * @param string $msg
     * @access private
     */
    function _disconnect($msg = 'Client Quit')
    {
        if ($this->bitmap) {
            $data = pack('C', NET_SSH1_CMSG_EOF);
            $this->_send_binary_packet($data);
            /*
            $response = $this->_get_binary_packet();
            if ($response === true) {
                $response = array(NET_SSH1_RESPONSE_TYPE => -1);
            }
            switch ($response[NET_SSH1_RESPONSE_TYPE]) {
                case NET_SSH1_SMSG_EXITSTATUS:
                    $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);
                    break;
                default:
                    $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);
            }
            */
            $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);

            $this->_send_binary_packet($data);
            fclose($this->fsock);
            $this->bitmap = 0;
        }
    }

    /**
     * Gets Binary Packets
     *
     * See 'The Binary Packet Protocol' of protocol-1.5.txt for more info.
     *
     * Also, this function could be improved upon by adding detection for the following exploit:
     * http://www.securiteam.com/securitynews/5LP042K3FY.html
     *
     * @see self::_send_binary_packet()
     * @return array
     * @access private
     */
    function _get_binary_packet()
    {
        if (feof($this->fsock)) {
            //user_error('connection closed prematurely');
            return false;
        }

        if ($this->curTimeout) {
            $read = array($this->fsock);
            $write = $except = null;

            $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
            $sec = floor($this->curTimeout);
            $usec = 1000000 * ($this->curTimeout - $sec);
            // on windows this returns a "Warning: Invalid CRT parameters detected" error
            if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
                //$this->_disconnect('Timeout');
                return true;
            }
            $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
            $this->curTimeout-= $elapsed;
        }

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
        $data = fread($this->fsock, 4);
        if (strlen($data) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $data);

        $padding_length = 8 - ($temp['length'] & 7);
        $length = $temp['length'] + $padding_length;
        $raw = '';

        while ($length > 0) {
            $temp = fread($this->fsock, $length);
            $raw.= $temp;
            $length-= strlen($temp);
        }
        $stop = strtok(microtime(), ' ') + strtok('');

        if (strlen($raw) && $this->crypto !== false) {
            $raw = $this->crypto->decrypt($raw);
        }

        $padding = substr($raw, 0, $padding_length);
        $type = $raw[$padding_length];
        $data = substr($raw, $padding_length + 1, -4);

        if (strlen($raw) < 4) {
            return false;
        }
        $temp = unpack('Ncrc', substr($raw, -4));

        //if ( $temp['crc'] != $this->_crc($padding . $type . $data) ) {
        //    user_error('Bad CRC in packet from server');
        //    return false;
        //}

        $type = ord($type);

        if (defined('NET_SSH1_LOGGING')) {
            $temp = isset($this->protocol_flags[$type]) ? $this->protocol_flags[$type] : 'UNKNOWN';
            $temp = '<- ' . $temp .
                    ' (' . round($stop - $start, 4) . 's)';
            $this->_append_log($temp, $data);
        }

        return array(
            NET_SSH1_RESPONSE_TYPE => $type,
            NET_SSH1_RESPONSE_DATA => $data
        );
    }

    /**
     * Sends Binary Packets
     *
     * Returns true on success, false on failure.
     *
     * @see self::_get_binary_packet()
     * @param string $data
     * @return bool
     * @access private
     */
    function _send_binary_packet($data)
    {
        if (feof($this->fsock)) {
            //user_error('connection closed prematurely');
            return false;
        }

        $length = strlen($data) + 4;

        $padding = crypt_random_string(8 - ($length & 7));

        $orig = $data;
        $data = $padding . $data;
        $data.= pack('N', $this->_crc($data));

        if ($this->crypto !== false) {
            $data = $this->crypto->encrypt($data);
        }

        $packet = pack('Na*', $length, $data);

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
        $result = strlen($packet) == fputs($this->fsock, $packet);
        $stop = strtok(microtime(), ' ') + strtok('');

        if (defined('NET_SSH1_LOGGING')) {
            $temp = isset($this->protocol_flags[ord($orig[0])]) ? $this->protocol_flags[ord($orig[0])] : 'UNKNOWN';
            $temp = '-> ' . $temp .
                    ' (' . round($stop - $start, 4) . 's)';
            $this->_append_log($temp, $orig);
        }

        return $result;
    }

    /**
     * Cyclic Redundancy Check (CRC)
     *
     * PHP's crc32 function is implemented slightly differently than the one that SSH v1 uses, so
     * we've reimplemented it. A more detailed discussion of the differences can be found after
     * $crc_lookup_table's initialization.
     *
     * @see self::_get_binary_packet()
     * @see self::_send_binary_packet()
     * @param string $data
     * @return int
     * @access private
     */
    function _crc($data)
    {
        static $crc_lookup_table = array(
            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
            0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
            0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
            0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
            0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
            0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
            0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
            0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
            0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
            0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
            0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
            0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
            0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
            0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
            0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
            0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
            0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
            0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
            0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
            0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
            0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
            0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
            0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
            0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
            0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
            0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
            0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
            0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
            0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
            0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
            0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
            0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
            0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
            0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
            0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
        );

        // For this function to yield the same output as PHP's crc32 function, $crc would have to be
        // set to 0xFFFFFFFF, initially - not 0x00000000 as it currently is.
        $crc = 0x00000000;
        $length = strlen($data);

        for ($i=0; $i<$length; $i++) {
            // We AND $crc >> 8 with 0x00FFFFFF because we want the eight newly added bits to all
            // be zero.  PHP, unfortunately, doesn't always do this.  0x80000000 >> 8, as an example,
            // yields 0xFF800000 - not 0x00800000.  The following link elaborates:
            // http://www.php.net/manual/en/language.operators.bitwise.php#57281
            $crc = (($crc >> 8) & 0x00FFFFFF) ^ $crc_lookup_table[($crc & 0xFF) ^ ord($data[$i])];
        }

        // In addition to having to set $crc to 0xFFFFFFFF, initially, the return value must be XOR'd with
        // 0xFFFFFFFF for this function to return the same thing that PHP's crc32 function would.
        return $crc;
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }

    /**
     * RSA Encrypt
     *
     * Returns mod(pow($m, $e), $n), where $n should be the product of two (large) primes $p and $q and where $e
     * should be a number with the property that gcd($e, ($p - 1) * ($q - 1)) == 1.  Could just make anything that
     * calls this call modexp, instead, but I think this makes things clearer, maybe...
     *
     * @see self::Net_SSH1()
     * @param Math_BigInteger $m
     * @param array $key
     * @return Math_BigInteger
     * @access private
     */
    function _rsa_crypt($m, $key)
    {
        /*
        if (!class_exists('Crypt_RSA')) {
            include_once 'Crypt/RSA.php';
        }

        $rsa = new Crypt_RSA();
        $rsa->loadKey($key, CRYPT_RSA_PUBLIC_FORMAT_RAW);
        $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
        return $rsa->encrypt($m);
        */

        // To quote from protocol-1.5.txt:
        // The most significant byte (which is only partial as the value must be
        // less than the public modulus, which is never a power of two) is zero.
        //
        // The next byte contains the value 2 (which stands for public-key
        // encrypted data in the PKCS standard [PKCS#1]).  Then, there are non-
        // zero random bytes to fill any unused space, a zero byte, and the data
        // to be encrypted in the least significant bytes, the last byte of the
        // data in the least significant byte.

        // Presumably the part of PKCS#1 they're refering to is "Section 7.2.1 Encryption Operation",
        // under "7.2 RSAES-PKCS1-v1.5" and "7 Encryption schemes" of the following URL:
        // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf
        $modulus = $key[1]->toBytes();
        $length = strlen($modulus) - strlen($m) - 3;
        $random = '';
        while (strlen($random) != $length) {
            $block = crypt_random_string($length - strlen($random));
            $block = str_replace("\x00", '', $block);
            $random.= $block;
        }
        $temp = chr(0) . chr(2) . $random . chr(0) . $m;

        $m = new Math_BigInteger($temp, 256);
        $m = $m->modPow($key[0], $key[1]);

        return $m->toBytes();
    }

    /**
     * Define Array
     *
     * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
     * named constants from it, using the value as the name of the constant and the index as the value of the constant.
     * If any of the constants that would be defined already exists, none of the constants will be defined.
     *
     * @param array $array
     * @access private
     */
    function _define_array()
    {
        $args = func_get_args();
        foreach ($args as $arg) {
            foreach ($arg as $key => $value) {
                if (!defined($value)) {
                    define($value, $key);
                } else {
                    break 2;
                }
            }
        }
    }

    /**
     * Returns a log of the packets that have been sent and received.
     *
     * Returns a string if NET_SSH1_LOGGING == NET_SSH1_LOG_COMPLEX, an array if NET_SSH1_LOGGING == NET_SSH1_LOG_SIMPLE and false if !defined('NET_SSH1_LOGGING')
     *
     * @access public
     * @return array|false|string
     */
    function getLog()
    {
        if (!defined('NET_SSH1_LOGGING')) {
            return false;
        }

        switch (NET_SSH1_LOGGING) {
            case NET_SSH1_LOG_SIMPLE:
                return $this->message_number_log;
                break;
            case NET_SSH1_LOG_COMPLEX:
                return $this->_format_log($this->message_log, $this->protocol_flags_log);
                break;
            default:
                return false;
        }
    }

    /**
     * Formats a log for printing
     *
     * @param array $message_log
     * @param array $message_number_log
     * @access private
     * @return string
     */
    function _format_log($message_log, $message_number_log)
    {
        $output = '';
        for ($i = 0; $i < count($message_log); $i++) {
            $output.= $message_number_log[$i] . "\r\n";
            $current_log = $message_log[$i];
            $j = 0;
            do {
                if (strlen($current_log)) {
                    $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
                }
                $fragment = $this->_string_shift($current_log, $this->log_short_width);
                $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary));
                // replace non ASCII printable characters with dots
                // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
                // also replace < with a . since < messes up the output on web browsers
                $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
                $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
                $j++;
            } while (strlen($current_log));
            $output.= "\r\n";
        }

        return $output;
    }

    /**
     * Helper function for _format_log
     *
     * For use with preg_replace_callback()
     *
     * @param array $matches
     * @access private
     * @return string
     */
    function _format_log_helper($matches)
    {
        return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
    }

    /**
     * Return the server key public exponent
     *
     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
     * the raw bytes.  This behavior is similar to PHP's md5() function.
     *
     * @param bool $raw_output
     * @return string
     * @access public
     */
    function getServerKeyPublicExponent($raw_output = false)
    {
        return $raw_output ? $this->server_key_public_exponent->toBytes() : $this->server_key_public_exponent->toString();
    }

    /**
     * Return the server key public modulus
     *
     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
     * the raw bytes.  This behavior is similar to PHP's md5() function.
     *
     * @param bool $raw_output
     * @return string
     * @access public
     */
    function getServerKeyPublicModulus($raw_output = false)
    {
        return $raw_output ? $this->server_key_public_modulus->toBytes() : $this->server_key_public_modulus->toString();
    }

    /**
     * Return the host key public exponent
     *
     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
     * the raw bytes.  This behavior is similar to PHP's md5() function.
     *
     * @param bool $raw_output
     * @return string
     * @access public
     */
    function getHostKeyPublicExponent($raw_output = false)
    {
        return $raw_output ? $this->host_key_public_exponent->toBytes() : $this->host_key_public_exponent->toString();
    }

    /**
     * Return the host key public modulus
     *
     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
     * the raw bytes.  This behavior is similar to PHP's md5() function.
     *
     * @param bool $raw_output
     * @return string
     * @access public
     */
    function getHostKeyPublicModulus($raw_output = false)
    {
        return $raw_output ? $this->host_key_public_modulus->toBytes() : $this->host_key_public_modulus->toString();
    }

    /**
     * Return a list of ciphers supported by SSH1 server.
     *
     * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
     * is set to true, returns, instead, an array of constants.  ie. instead of array('Triple-DES in CBC mode'), you'll
     * get array(NET_SSH1_CIPHER_3DES).
     *
     * @param bool $raw_output
     * @return array
     * @access public
     */
    function getSupportedCiphers($raw_output = false)
    {
        return $raw_output ? array_keys($this->supported_ciphers) : array_values($this->supported_ciphers);
    }

    /**
     * Return a list of authentications supported by SSH1 server.
     *
     * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
     * is set to true, returns, instead, an array of constants.  ie. instead of array('password authentication'), you'll
     * get array(NET_SSH1_AUTH_PASSWORD).
     *
     * @param bool $raw_output
     * @return array
     * @access public
     */
    function getSupportedAuthentications($raw_output = false)
    {
        return $raw_output ? array_keys($this->supported_authentications) : array_values($this->supported_authentications);
    }

    /**
     * Return the server identification.
     *
     * @return string
     * @access public
     */
    function getServerIdentification()
    {
        return rtrim($this->server_identification);
    }

    /**
     * Logs data packets
     *
     * Makes sure that only the last 1MB worth of packets will be logged
     *
     * @param string $data
     * @access private
     */
    function _append_log($protocol_flags, $message)
    {
        switch (NET_SSH1_LOGGING) {
            // useful for benchmarks
            case NET_SSH1_LOG_SIMPLE:
                $this->protocol_flags_log[] = $protocol_flags;
                break;
            // the most useful log for SSH1
            case NET_SSH1_LOG_COMPLEX:
                $this->protocol_flags_log[] = $protocol_flags;
                $this->_string_shift($message);
                $this->log_size+= strlen($message);
                $this->message_log[] = $message;
                while ($this->log_size > NET_SSH1_LOG_MAX_SIZE) {
                    $this->log_size-= strlen(array_shift($this->message_log));
                    array_shift($this->protocol_flags_log);
                }
                break;
            // dump the output out realtime; packets may be interspersed with non packets,
            // passwords won't be filtered out and select other packets may not be correctly
            // identified
            case NET_SSH1_LOG_REALTIME:
                echo "
\r\n" . $this->_format_log(array($message), array($protocol_flags)) . "\r\n
\r\n";
                @flush();
                @ob_flush();
                break;
            // basically the same thing as NET_SSH1_LOG_REALTIME with the caveat that NET_SSH1_LOG_REALTIME_FILE
            // needs to be defined and that the resultant log file will be capped out at NET_SSH1_LOG_MAX_SIZE.
            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
            // at the beginning of the file
            case NET_SSH1_LOG_REALTIME_FILE:
                if (!isset($this->realtime_log_file)) {
                    // PHP doesn't seem to like using constants in fopen()
                    $filename = NET_SSH1_LOG_REALTIME_FILE;
                    $fp = fopen($filename, 'w');
                    $this->realtime_log_file = $fp;
                }
                if (!is_resource($this->realtime_log_file)) {
                    break;
                }
                $entry = $this->_format_log(array($message), array($protocol_flags));
                if ($this->realtime_log_wrap) {
                    $temp = "<<< START >>>\r\n";
                    $entry.= $temp;
                    fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
                }
                $this->realtime_log_size+= strlen($entry);
                if ($this->realtime_log_size > NET_SSH1_LOG_MAX_SIZE) {
                    fseek($this->realtime_log_file, 0);
                    $this->realtime_log_size = strlen($entry);
                    $this->realtime_log_wrap = true;
                }
                fputs($this->realtime_log_file, $entry);
        }
    }
}
phpseclib-1.0.18/phpseclib/Net/SSH2.php000066400000000000000000005162331354156543400175250ustar00rootroot00000000000000
 * login('username', 'password')) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $ssh->exec('pwd');
 *    echo $ssh->exec('ls -la');
 * ?>
 * 
 *
 * 
 * setPassword('whatever');
 *    $key->loadKey(file_get_contents('privatekey'));
 *
 *    $ssh = new Net_SSH2('www.domain.tld');
 *    if (!$ssh->login('username', $key)) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $ssh->read('username@username:~$');
 *    $ssh->write("ls -la\n");
 *    echo $ssh->read('username@username:~$');
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  Net
 * @package   Net_SSH2
 * @author    Jim Wigginton 
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

/**#@+
 * Execution Bitmap Masks
 *
 * @see self::bitmap
 * @access private
 */
define('NET_SSH2_MASK_CONSTRUCTOR',   0x00000001);
define('NET_SSH2_MASK_CONNECTED',     0x00000002);
define('NET_SSH2_MASK_LOGIN_REQ',     0x00000004);
define('NET_SSH2_MASK_LOGIN',         0x00000008);
define('NET_SSH2_MASK_SHELL',         0x00000010);
define('NET_SSH2_MASK_WINDOW_ADJUST', 0x00000020);
/**#@-*/

/**#@+
 * Channel constants
 *
 * RFC4254 refers not to client and server channels but rather to sender and recipient channels.  we don't refer
 * to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with
 * a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a
 * recepient channel.  at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel
 * would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snipet:
 *     The 'recipient channel' is the channel number given in the original
 *     open request, and 'sender channel' is the channel number allocated by
 *     the other side.
 *
 * @see self::_send_channel_packet()
 * @see self::_get_channel_packet()
 * @access private
 */
define('NET_SSH2_CHANNEL_EXEC',          1); // PuTTy uses 0x100
define('NET_SSH2_CHANNEL_SHELL',         2);
define('NET_SSH2_CHANNEL_SUBSYSTEM',     3);
define('NET_SSH2_CHANNEL_AGENT_FORWARD', 4);
define('NET_SSH2_CHANNEL_KEEP_ALIVE',    5);
/**#@-*/

/**#@+
 * @access public
 * @see self::getLog()
 */
/**
 * Returns the message numbers
 */
define('NET_SSH2_LOG_SIMPLE',  1);
/**
 * Returns the message content
 */
define('NET_SSH2_LOG_COMPLEX', 2);
/**
 * Outputs the content real-time
 */
define('NET_SSH2_LOG_REALTIME', 3);
/**
 * Dumps the content real-time to a file
 */
define('NET_SSH2_LOG_REALTIME_FILE', 4);
/**
 * Make sure that the log never gets larger than this
 */
define('NET_SSH2_LOG_MAX_SIZE', 1024 * 1024);
/**#@-*/

/**#@+
 * @access public
 * @see self::read()
 */
/**
 * Returns when a string matching $expect exactly is found
 */
define('NET_SSH2_READ_SIMPLE',  1);
/**
 * Returns when a string matching the regular expression $expect is found
 */
define('NET_SSH2_READ_REGEX', 2);
/**
 * Returns whenever a data packet is received.
 *
 * Some data packets may only contain a single character so it may be necessary
 * to call read() multiple times when using this option
 */
define('NET_SSH2_READ_NEXT', 3);
/**#@-*/

/**
 * Pure-PHP implementation of SSHv2.
 *
 * @package Net_SSH2
 * @author  Jim Wigginton 
 * @access  public
 */
class Net_SSH2
{
    /**
     * The SSH identifier
     *
     * @var string
     * @access private
     */
    var $identifier;

    /**
     * The Socket Object
     *
     * @var object
     * @access private
     */
    var $fsock;

    /**
     * Execution Bitmap
     *
     * The bits that are set represent functions that have been called already.  This is used to determine
     * if a requisite function has been successfully executed.  If not, an error should be thrown.
     *
     * @var int
     * @access private
     */
    var $bitmap = 0;

    /**
     * Error information
     *
     * @see self::getErrors()
     * @see self::getLastError()
     * @var string
     * @access private
     */
    var $errors = array();

    /**
     * Server Identifier
     *
     * @see self::getServerIdentification()
     * @var array|false
     * @access private
     */
    var $server_identifier = false;

    /**
     * Key Exchange Algorithms
     *
     * @see self::getKexAlgorithims()
     * @var array|false
     * @access private
     */
    var $kex_algorithms = false;

    /**
     * Key Exchange Algorithm
     *
     * @see self::getMethodsNegotiated()
     * @var string|false
     * @access private
     */
    var $kex_algorithm = false;

    /**
     * Minimum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
     *
     * @see self::_key_exchange()
     * @var int
     * @access private
     */
    var $kex_dh_group_size_min = 1536;

    /**
     * Preferred Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
     *
     * @see self::_key_exchange()
     * @var int
     * @access private
     */
    var $kex_dh_group_size_preferred = 2048;

    /**
     * Maximum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
     *
     * @see self::_key_exchange()
     * @var int
     * @access private
     */
    var $kex_dh_group_size_max = 4096;

    /**
     * Server Host Key Algorithms
     *
     * @see self::getServerHostKeyAlgorithms()
     * @var array|false
     * @access private
     */
    var $server_host_key_algorithms = false;

    /**
     * Encryption Algorithms: Client to Server
     *
     * @see self::getEncryptionAlgorithmsClient2Server()
     * @var array|false
     * @access private
     */
    var $encryption_algorithms_client_to_server = false;

    /**
     * Encryption Algorithms: Server to Client
     *
     * @see self::getEncryptionAlgorithmsServer2Client()
     * @var array|false
     * @access private
     */
    var $encryption_algorithms_server_to_client = false;

    /**
     * MAC Algorithms: Client to Server
     *
     * @see self::getMACAlgorithmsClient2Server()
     * @var array|false
     * @access private
     */
    var $mac_algorithms_client_to_server = false;

    /**
     * MAC Algorithms: Server to Client
     *
     * @see self::getMACAlgorithmsServer2Client()
     * @var array|false
     * @access private
     */
    var $mac_algorithms_server_to_client = false;

    /**
     * Compression Algorithms: Client to Server
     *
     * @see self::getCompressionAlgorithmsClient2Server()
     * @var array|false
     * @access private
     */
    var $compression_algorithms_client_to_server = false;

    /**
     * Compression Algorithms: Server to Client
     *
     * @see self::getCompressionAlgorithmsServer2Client()
     * @var array|false
     * @access private
     */
    var $compression_algorithms_server_to_client = false;

    /**
     * Languages: Server to Client
     *
     * @see self::getLanguagesServer2Client()
     * @var array|false
     * @access private
     */
    var $languages_server_to_client = false;

    /**
     * Languages: Client to Server
     *
     * @see self::getLanguagesClient2Server()
     * @var array|false
     * @access private
     */
    var $languages_client_to_server = false;

    /**
     * Preferred Algorithms
     *
     * @see self::setPreferredAlgorithms()
     * @var array
     * @access private
     */
    var $preferred = array();

    /**
     * Block Size for Server to Client Encryption
     *
     * "Note that the length of the concatenation of 'packet_length',
     *  'padding_length', 'payload', and 'random padding' MUST be a multiple
     *  of the cipher block size or 8, whichever is larger.  This constraint
     *  MUST be enforced, even when using stream ciphers."
     *
     *  -- http://tools.ietf.org/html/rfc4253#section-6
     *
     * @see self::Net_SSH2()
     * @see self::_send_binary_packet()
     * @var int
     * @access private
     */
    var $encrypt_block_size = 8;

    /**
     * Block Size for Client to Server Encryption
     *
     * @see self::Net_SSH2()
     * @see self::_get_binary_packet()
     * @var int
     * @access private
     */
    var $decrypt_block_size = 8;

    /**
     * Server to Client Encryption Object
     *
     * @see self::_get_binary_packet()
     * @var object
     * @access private
     */
    var $decrypt = false;

    /**
     * Client to Server Encryption Object
     *
     * @see self::_send_binary_packet()
     * @var object
     * @access private
     */
    var $encrypt = false;

    /**
     * Client to Server HMAC Object
     *
     * @see self::_send_binary_packet()
     * @var object
     * @access private
     */
    var $hmac_create = false;

    /**
     * Server to Client HMAC Object
     *
     * @see self::_get_binary_packet()
     * @var object
     * @access private
     */
    var $hmac_check = false;

    /**
     * Size of server to client HMAC
     *
     * We need to know how big the HMAC will be for the server to client direction so that we know how many bytes to read.
     * For the client to server side, the HMAC object will make the HMAC as long as it needs to be.  All we need to do is
     * append it.
     *
     * @see self::_get_binary_packet()
     * @var int
     * @access private
     */
    var $hmac_size = false;

    /**
     * Server Public Host Key
     *
     * @see self::getServerPublicHostKey()
     * @var string
     * @access private
     */
    var $server_public_host_key;

    /**
     * Session identifier
     *
     * "The exchange hash H from the first key exchange is additionally
     *  used as the session identifier, which is a unique identifier for
     *  this connection."
     *
     *  -- http://tools.ietf.org/html/rfc4253#section-7.2
     *
     * @see self::_key_exchange()
     * @var string
     * @access private
     */
    var $session_id = false;

    /**
     * Exchange hash
     *
     * The current exchange hash
     *
     * @see self::_key_exchange()
     * @var string
     * @access private
     */
    var $exchange_hash = false;

    /**
     * Message Numbers
     *
     * @see self::Net_SSH2()
     * @var array
     * @access private
     */
    var $message_numbers = array();

    /**
     * Disconnection Message 'reason codes' defined in RFC4253
     *
     * @see self::Net_SSH2()
     * @var array
     * @access private
     */
    var $disconnect_reasons = array();

    /**
     * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254
     *
     * @see self::Net_SSH2()
     * @var array
     * @access private
     */
    var $channel_open_failure_reasons = array();

    /**
     * Terminal Modes
     *
     * @link http://tools.ietf.org/html/rfc4254#section-8
     * @see self::Net_SSH2()
     * @var array
     * @access private
     */
    var $terminal_modes = array();

    /**
     * SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes
     *
     * @link http://tools.ietf.org/html/rfc4254#section-5.2
     * @see self::Net_SSH2()
     * @var array
     * @access private
     */
    var $channel_extended_data_type_codes = array();

    /**
     * Send Sequence Number
     *
     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
     *
     * @see self::_send_binary_packet()
     * @var int
     * @access private
     */
    var $send_seq_no = 0;

    /**
     * Get Sequence Number
     *
     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
     *
     * @see self::_get_binary_packet()
     * @var int
     * @access private
     */
    var $get_seq_no = 0;

    /**
     * Server Channels
     *
     * Maps client channels to server channels
     *
     * @see self::_get_channel_packet()
     * @see self::exec()
     * @var array
     * @access private
     */
    var $server_channels = array();

    /**
     * Channel Buffers
     *
     * If a client requests a packet from one channel but receives two packets from another those packets should
     * be placed in a buffer
     *
     * @see self::_get_channel_packet()
     * @see self::exec()
     * @var array
     * @access private
     */
    var $channel_buffers = array();

    /**
     * Channel Status
     *
     * Contains the type of the last sent message
     *
     * @see self::_get_channel_packet()
     * @var array
     * @access private
     */
    var $channel_status = array();

    /**
     * Packet Size
     *
     * Maximum packet size indexed by channel
     *
     * @see self::_send_channel_packet()
     * @var array
     * @access private
     */
    var $packet_size_client_to_server = array();

    /**
     * Message Number Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $message_number_log = array();

    /**
     * Message Log
     *
     * @see self::getLog()
     * @var array
     * @access private
     */
    var $message_log = array();

    /**
     * The Window Size
     *
     * Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 2GB)
     *
     * @var int
     * @see self::_send_channel_packet()
     * @see self::exec()
     * @access private
     */
    var $window_size = 0x7FFFFFFF;

    /**
     * Window size, server to client
     *
     * Window size indexed by channel
     *
     * @see self::_send_channel_packet()
     * @var array
     * @access private
     */
    var $window_size_server_to_client = array();

    /**
     * Window size, client to server
     *
     * Window size indexed by channel
     *
     * @see self::_get_channel_packet()
     * @var array
     * @access private
     */
    var $window_size_client_to_server = array();

    /**
     * Server signature
     *
     * Verified against $this->session_id
     *
     * @see self::getServerPublicHostKey()
     * @var string
     * @access private
     */
    var $signature = '';

    /**
     * Server signature format
     *
     * ssh-rsa or ssh-dss.
     *
     * @see self::getServerPublicHostKey()
     * @var string
     * @access private
     */
    var $signature_format = '';

    /**
     * Interactive Buffer
     *
     * @see self::read()
     * @var array
     * @access private
     */
    var $interactiveBuffer = '';

    /**
     * Current log size
     *
     * Should never exceed NET_SSH2_LOG_MAX_SIZE
     *
     * @see self::_send_binary_packet()
     * @see self::_get_binary_packet()
     * @var int
     * @access private
     */
    var $log_size;

    /**
     * Timeout
     *
     * @see self::setTimeout()
     * @access private
     */
    var $timeout;

    /**
     * Current Timeout
     *
     * @see self::_get_channel_packet()
     * @access private
     */
    var $curTimeout;

    /**
     * Real-time log file pointer
     *
     * @see self::_append_log()
     * @var resource
     * @access private
     */
    var $realtime_log_file;

    /**
     * Real-time log file size
     *
     * @see self::_append_log()
     * @var int
     * @access private
     */
    var $realtime_log_size;

    /**
     * Has the signature been validated?
     *
     * @see self::getServerPublicHostKey()
     * @var bool
     * @access private
     */
    var $signature_validated = false;

    /**
     * Real-time log file wrap boolean
     *
     * @see self::_append_log()
     * @access private
     */
    var $realtime_log_wrap;

    /**
     * Flag to suppress stderr from output
     *
     * @see self::enableQuietMode()
     * @access private
     */
    var $quiet_mode = false;

    /**
     * Time of first network activity
     *
     * @var int
     * @access private
     */
    var $last_packet;

    /**
     * Exit status returned from ssh if any
     *
     * @var int
     * @access private
     */
    var $exit_status;

    /**
     * Flag to request a PTY when using exec()
     *
     * @var bool
     * @see self::enablePTY()
     * @access private
     */
    var $request_pty = false;

    /**
     * Flag set while exec() is running when using enablePTY()
     *
     * @var bool
     * @access private
     */
    var $in_request_pty_exec = false;

    /**
     * Flag set after startSubsystem() is called
     *
     * @var bool
     * @access private
     */
    var $in_subsystem;

    /**
     * Contents of stdError
     *
     * @var string
     * @access private
     */
    var $stdErrorLog;

    /**
     * The Last Interactive Response
     *
     * @see self::_keyboard_interactive_process()
     * @var string
     * @access private
     */
    var $last_interactive_response = '';

    /**
     * Keyboard Interactive Request / Responses
     *
     * @see self::_keyboard_interactive_process()
     * @var array
     * @access private
     */
    var $keyboard_requests_responses = array();

    /**
     * Banner Message
     *
     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
     * authentication may be relevant for getting legal protection."
     *
     * @see self::_filter()
     * @see self::getBannerMessage()
     * @var string
     * @access private
     */
    var $banner_message = '';

    /**
     * Did read() timeout or return normally?
     *
     * @see self::isTimeout()
     * @var bool
     * @access private
     */
    var $is_timeout = false;

    /**
     * Log Boundary
     *
     * @see self::_format_log()
     * @var string
     * @access private
     */
    var $log_boundary = ':';

    /**
     * Log Long Width
     *
     * @see self::_format_log()
     * @var int
     * @access private
     */
    var $log_long_width = 65;

    /**
     * Log Short Width
     *
     * @see self::_format_log()
     * @var int
     * @access private
     */
    var $log_short_width = 16;

    /**
     * Hostname
     *
     * @see self::Net_SSH2()
     * @see self::_connect()
     * @var string
     * @access private
     */
    var $host;

    /**
     * Port Number
     *
     * @see self::Net_SSH2()
     * @see self::_connect()
     * @var int
     * @access private
     */
    var $port;

    /**
     * Number of columns for terminal window size
     *
     * @see self::getWindowColumns()
     * @see self::setWindowColumns()
     * @see self::setWindowSize()
     * @var int
     * @access private
     */
    var $windowColumns = 80;

    /**
     * Number of columns for terminal window size
     *
     * @see self::getWindowRows()
     * @see self::setWindowRows()
     * @see self::setWindowSize()
     * @var int
     * @access private
     */
    var $windowRows = 24;

    /**
     * Crypto Engine
     *
     * @see self::setCryptoEngine()
     * @see self::_key_exchange()
     * @var int
     * @access private
     */
    var $crypto_engine = false;

    /**
     * A System_SSH_Agent for use in the SSH2 Agent Forwarding scenario
     *
     * @var System_SSH_Agent
     * @access private
     */
    var $agent;

    /**
     * Send the identification string first?
     *
     * @var bool
     * @access private
     */
    var $send_id_string_first = true;

    /**
     * Send the key exchange initiation packet first?
     *
     * @var bool
     * @access private
     */
    var $send_kex_first = true;

    /**
     * Some versions of OpenSSH incorrectly calculate the key size
     *
     * @var bool
     * @access private
     */
    var $bad_key_size_fix = false;

    /**
     * Should we try to re-connect to re-establish keys?
     *
     * @var bool
     * @access private
     */
    var $retry_connect = false;

    /**
     * Binary Packet Buffer
     *
     * @var string|false
     * @access private
     */
    var $binary_packet_buffer = false;

    /**
     * Preferred Signature Format
     *
     * @var string|false
     * @access private
     */
    var $preferred_signature_format = false;

    /**
     * Authentication Credentials
     *
     * @var array
     * @access private
     */
    var $auth = array();

    /**
     * Default Constructor.
     *
     * $host can either be a string, representing the host, or a stream resource.
     *
     * @param mixed $host
     * @param int $port
     * @param int $timeout
     * @see self::login()
     * @return Net_SSH2
     * @access public
     */
    function __construct($host, $port = 22, $timeout = 10)
    {
        // Include Math_BigInteger
        // Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
        if (!class_exists('Math_BigInteger')) {
            include_once 'Math/BigInteger.php';
        }

        if (!function_exists('crypt_random_string')) {
            include_once 'Crypt/Random.php';
        }

        if (!class_exists('Crypt_Hash')) {
            include_once 'Crypt/Hash.php';
        }

        // include Crypt_Base so constants can be defined for setCryptoEngine()
        if (!class_exists('Crypt_Base')) {
            include_once 'Crypt/Base.php';
        }

        $this->message_numbers = array(
            1 => 'NET_SSH2_MSG_DISCONNECT',
            2 => 'NET_SSH2_MSG_IGNORE',
            3 => 'NET_SSH2_MSG_UNIMPLEMENTED',
            4 => 'NET_SSH2_MSG_DEBUG',
            5 => 'NET_SSH2_MSG_SERVICE_REQUEST',
            6 => 'NET_SSH2_MSG_SERVICE_ACCEPT',
            20 => 'NET_SSH2_MSG_KEXINIT',
            21 => 'NET_SSH2_MSG_NEWKEYS',
            30 => 'NET_SSH2_MSG_KEXDH_INIT',
            31 => 'NET_SSH2_MSG_KEXDH_REPLY',
            50 => 'NET_SSH2_MSG_USERAUTH_REQUEST',
            51 => 'NET_SSH2_MSG_USERAUTH_FAILURE',
            52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS',
            53 => 'NET_SSH2_MSG_USERAUTH_BANNER',

            80 => 'NET_SSH2_MSG_GLOBAL_REQUEST',
            81 => 'NET_SSH2_MSG_REQUEST_SUCCESS',
            82 => 'NET_SSH2_MSG_REQUEST_FAILURE',
            90 => 'NET_SSH2_MSG_CHANNEL_OPEN',
            91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION',
            92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE',
            93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST',
            94 => 'NET_SSH2_MSG_CHANNEL_DATA',
            95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA',
            96 => 'NET_SSH2_MSG_CHANNEL_EOF',
            97 => 'NET_SSH2_MSG_CHANNEL_CLOSE',
            98 => 'NET_SSH2_MSG_CHANNEL_REQUEST',
            99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS',
            100 => 'NET_SSH2_MSG_CHANNEL_FAILURE'
        );
        $this->disconnect_reasons = array(
            1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT',
            2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR',
            3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED',
            4 => 'NET_SSH2_DISCONNECT_RESERVED',
            5 => 'NET_SSH2_DISCONNECT_MAC_ERROR',
            6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR',
            7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE',
            8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED',
            9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE',
            10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST',
            11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION',
            12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS',
            13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER',
            14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE',
            15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME'
        );
        $this->channel_open_failure_reasons = array(
            1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED'
        );
        $this->terminal_modes = array(
            0 => 'NET_SSH2_TTY_OP_END'
        );
        $this->channel_extended_data_type_codes = array(
            1 => 'NET_SSH2_EXTENDED_DATA_STDERR'
        );

        $this->_define_array(
            $this->message_numbers,
            $this->disconnect_reasons,
            $this->channel_open_failure_reasons,
            $this->terminal_modes,
            $this->channel_extended_data_type_codes,
            array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'),
            array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'),
            array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
                  61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE'),
            // RFC 4419 - diffie-hellman-group-exchange-sha{1,256}
            array(30 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST_OLD',
                  31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP',
                  32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT',
                  33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY',
                  34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST')
        );

        if (is_resource($host)) {
            $this->fsock = $host;
            return;
        }

        if (is_string($host)) {
            $this->host = $host;
            $this->port = $port;
            $this->timeout = $timeout;
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param mixed $host
     * @param int $port
     * @param int $timeout
     * @access public
     */
    function Net_SSH2($host, $port = 22, $timeout = 10)
    {
        $this->__construct($host, $port, $timeout);
    }

    /**
     * Set Crypto Engine Mode
     *
     * Possible $engine values:
     * CRYPT_MODE_INTERNAL, CRYPT_MODE_MCRYPT
     *
     * @param int $engine
     * @access public
     */
    function setCryptoEngine($engine)
    {
        $this->crypto_engine = $engine;
    }

    /**
     * Send Identification String First
     *
     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
     * both sides MUST send an identification string". It does not say which side sends it first. In
     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
     *
     * @access public
     */
    function sendIdentificationStringFirst()
    {
        $this->send_id_string_first = true;
    }

    /**
     * Send Identification String Last
     *
     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
     * both sides MUST send an identification string". It does not say which side sends it first. In
     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
     *
     * @access public
     */
    function sendIdentificationStringLast()
    {
        $this->send_id_string_first = false;
    }

    /**
     * Send SSH_MSG_KEXINIT First
     *
     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
     *
     * @access public
     */
    function sendKEXINITFirst()
    {
        $this->send_kex_first = true;
    }

    /**
     * Send SSH_MSG_KEXINIT Last
     *
     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
     *
     * @access public
     */
    function sendKEXINITLast()
    {
        $this->send_kex_first = false;
    }

    /**
     * Connect to an SSHv2 server
     *
     * @return bool
     * @access private
     */
    function _connect()
    {
        if ($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) {
            return false;
        }

        $this->bitmap |= NET_SSH2_MASK_CONSTRUCTOR;

        $this->curTimeout = $this->timeout;

        $this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5

        if (!is_resource($this->fsock)) {
            $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
            // with stream_select a timeout of 0 means that no timeout takes place;
            // with fsockopen a timeout of 0 means that you instantly timeout
            // to resolve this incompatibility a timeout of 100,000 will be used for fsockopen if timeout is 0
            $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout == 0 ? 100000 : $this->curTimeout);
            if (!$this->fsock) {
                $host = $this->host . ':' . $this->port;
                user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
                return false;
            }
            $elapsed = strtok(microtime(), ' ') + strtok('') - $start;

            if ($this->curTimeout) {
                $this->curTimeout-= $elapsed;
                if ($this->curTimeout < 0) {
                    $this->is_timeout = true;
                    return false;
                }
            }
        }

        $this->identifier = $this->_generate_identifier();

        if ($this->send_id_string_first) {
            fputs($this->fsock, $this->identifier . "\r\n");
        }

        /* According to the SSH2 specs,

          "The server MAY send other lines of data before sending the version
           string.  Each line SHOULD be terminated by a Carriage Return and Line
           Feed.  Such lines MUST NOT begin with "SSH-", and SHOULD be encoded
           in ISO-10646 UTF-8 [RFC3629] (language is not specified).  Clients
           MUST be able to process such lines." */
        $temp = '';
        $extra = '';
        while (!feof($this->fsock) && !preg_match('#^SSH-(\d\.\d+)#', $temp, $matches)) {
            if (substr($temp, -2) == "\r\n") {
                $extra.= $temp;
                $temp = '';
            }

            if ($this->curTimeout) {
                if ($this->curTimeout < 0) {
                    $this->is_timeout = true;
                    return false;
                }
                $read = array($this->fsock);
                $write = $except = null;
                $start = strtok(microtime(), ' ') + strtok('');
                $sec = floor($this->curTimeout);
                $usec = 1000000 * ($this->curTimeout - $sec);
                // on windows this returns a "Warning: Invalid CRT parameters detected" error
                // the !count() is done as a workaround for 
                if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
                    $this->is_timeout = true;
                    return false;
                }
                $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
                $this->curTimeout-= $elapsed;
            }
            $temp.= fgets($this->fsock, 255);
        }

        if (feof($this->fsock)) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (defined('NET_SSH2_LOGGING')) {
            $this->_append_log('<-', $extra . $temp);
            $this->_append_log('->', $this->identifier . "\r\n");
        }

        $this->server_identifier = trim($temp, "\r\n");
        if (strlen($extra)) {
            $this->errors[] = $extra;
        }

        if (version_compare($matches[1], '1.99', '<')) {
            user_error("Cannot connect to SSH $matches[1] servers");
            return false;
        }

        if (!$this->send_id_string_first) {
            fputs($this->fsock, $this->identifier . "\r\n");
        }

        if (!$this->send_kex_first) {
            $response = $this->_get_binary_packet();
            if ($response === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }

            if (!strlen($response) || ord($response[0]) != NET_SSH2_MSG_KEXINIT) {
                user_error('Expected SSH_MSG_KEXINIT');
                return false;
            }

            if (!$this->_key_exchange($response)) {
                return false;
            }
        }

        if ($this->send_kex_first && !$this->_key_exchange()) {
            return false;
        }

        $this->bitmap|= NET_SSH2_MASK_CONNECTED;

        return true;
    }

    /**
     * Generates the SSH identifier
     *
     * You should overwrite this method in your own class if you want to use another identifier
     *
     * @access protected
     * @return string
     */
    function _generate_identifier()
    {
        $identifier = 'SSH-2.0-phpseclib_1.0';

        $ext = array();
        if (extension_loaded('openssl')) {
            $ext[] = 'openssl';
        } elseif (extension_loaded('mcrypt')) {
            $ext[] = 'mcrypt';
        }

        if (extension_loaded('gmp')) {
            $ext[] = 'gmp';
        } elseif (extension_loaded('bcmath')) {
            $ext[] = 'bcmath';
        }

        if (!empty($ext)) {
            $identifier .= ' (' . implode(', ', $ext) . ')';
        }

        return $identifier;
    }

    /**
     * Key Exchange
     *
     * @param string $kexinit_payload_server optional
     * @access private
     */
    function _key_exchange($kexinit_payload_server = false)
    {
        $preferred = $this->preferred;

        $kex_algorithms = isset($preferred['kex']) ?
            $preferred['kex'] :
            $this->getSupportedKEXAlgorithms();
        $server_host_key_algorithms = isset($preferred['hostkey']) ?
            $preferred['hostkey'] :
            $this->getSupportedHostKeyAlgorithms();
        $s2c_encryption_algorithms = isset($preferred['server_to_client']['crypt']) ?
            $preferred['server_to_client']['crypt'] :
            $this->getSupportedEncryptionAlgorithms();
        $c2s_encryption_algorithms = isset($preferred['client_to_server']['crypt']) ?
            $preferred['client_to_server']['crypt'] :
            $this->getSupportedEncryptionAlgorithms();
        $s2c_mac_algorithms = isset($preferred['server_to_client']['mac']) ?
            $preferred['server_to_client']['mac'] :
            $this->getSupportedMACAlgorithms();
        $c2s_mac_algorithms = isset($preferred['client_to_server']['mac']) ?
            $preferred['client_to_server']['mac'] :
            $this->getSupportedMACAlgorithms();
        $s2c_compression_algorithms = isset($preferred['server_to_client']['comp']) ?
            $preferred['server_to_client']['comp'] :
            $this->getSupportedCompressionAlgorithms();
        $c2s_compression_algorithms = isset($preferred['client_to_server']['comp']) ?
            $preferred['client_to_server']['comp'] :
            $this->getSupportedCompressionAlgorithms();

        // some SSH servers have buggy implementations of some of the above algorithms
        switch (true) {
            case $this->server_identifier == 'SSH-2.0-SSHD':
            case substr($this->server_identifier, 0, 13) == 'SSH-2.0-DLINK':
                if (!isset($preferred['server_to_client']['mac'])) {
                    $s2c_mac_algorithms = array_values(array_diff(
                        $s2c_mac_algorithms,
                        array('hmac-sha1-96', 'hmac-md5-96')
                    ));
                }
                if (!isset($preferred['client_to_server']['mac'])) {
                    $c2s_mac_algorithms = array_values(array_diff(
                        $c2s_mac_algorithms,
                        array('hmac-sha1-96', 'hmac-md5-96')
                    ));
                }
        }

        $str_kex_algorithms = implode(',', $kex_algorithms);
        $str_server_host_key_algorithms = implode(',', $server_host_key_algorithms);
        $encryption_algorithms_server_to_client = implode(',', $s2c_encryption_algorithms);
        $encryption_algorithms_client_to_server = implode(',', $c2s_encryption_algorithms);
        $mac_algorithms_server_to_client = implode(',', $s2c_mac_algorithms);
        $mac_algorithms_client_to_server = implode(',', $c2s_mac_algorithms);
        $compression_algorithms_server_to_client = implode(',', $s2c_compression_algorithms);
        $compression_algorithms_client_to_server = implode(',', $c2s_compression_algorithms);

        $client_cookie = crypt_random_string(16);

        $kexinit_payload_client = pack(
            'Ca*Na*Na*Na*Na*Na*Na*Na*Na*Na*Na*CN',
            NET_SSH2_MSG_KEXINIT,
            $client_cookie,
            strlen($str_kex_algorithms),
            $str_kex_algorithms,
            strlen($str_server_host_key_algorithms),
            $str_server_host_key_algorithms,
            strlen($encryption_algorithms_client_to_server),
            $encryption_algorithms_client_to_server,
            strlen($encryption_algorithms_server_to_client),
            $encryption_algorithms_server_to_client,
            strlen($mac_algorithms_client_to_server),
            $mac_algorithms_client_to_server,
            strlen($mac_algorithms_server_to_client),
            $mac_algorithms_server_to_client,
            strlen($compression_algorithms_client_to_server),
            $compression_algorithms_client_to_server,
            strlen($compression_algorithms_server_to_client),
            $compression_algorithms_server_to_client,
            0,
            '',
            0,
            '',
            0,
            0
        );

        if ($this->send_kex_first) {
            if (!$this->_send_binary_packet($kexinit_payload_client)) {
                return false;
            }

            $kexinit_payload_server = $this->_get_binary_packet();
            if ($kexinit_payload_server === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }

            if (!strlen($kexinit_payload_server) || ord($kexinit_payload_server[0]) != NET_SSH2_MSG_KEXINIT) {
                user_error('Expected SSH_MSG_KEXINIT');
                return false;
            }
        }

        $response = $kexinit_payload_server;
        $this->_string_shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT)
        $server_cookie = $this->_string_shift($response, 16);

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->server_host_key_algorithms = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->encryption_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->encryption_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->mac_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->mac_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->compression_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->compression_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->languages_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->languages_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Cfirst_kex_packet_follows', $this->_string_shift($response, 1)));
        $first_kex_packet_follows = $first_kex_packet_follows != 0;

        if (!$this->send_kex_first && !$this->_send_binary_packet($kexinit_payload_client)) {
            return false;
        }

        // we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange
        // we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the
        // diffie-hellman key exchange as fast as possible
        $decrypt = $this->_array_intersect_first($s2c_encryption_algorithms, $this->encryption_algorithms_server_to_client);
        $decryptKeyLength = $this->_encryption_algorithm_to_key_size($decrypt);
        if ($decryptKeyLength === null) {
            user_error('No compatible server to client encryption algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }

        $encrypt = $this->_array_intersect_first($c2s_encryption_algorithms, $this->encryption_algorithms_client_to_server);
        $encryptKeyLength = $this->_encryption_algorithm_to_key_size($encrypt);
        if ($encryptKeyLength === null) {
            user_error('No compatible client to server encryption algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }

        $keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength;

        // through diffie-hellman key exchange a symmetric key is obtained
        $this->kex_algorithm = $kex_algorithm = $this->_array_intersect_first($kex_algorithms, $this->kex_algorithms);
        if ($kex_algorithm === false) {
            user_error('No compatible key exchange algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }
        if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
            $dh_group_sizes_packed = pack(
                'NNN',
                $this->kex_dh_group_size_min,
                $this->kex_dh_group_size_preferred,
                $this->kex_dh_group_size_max
            );
            $packet = pack(
                'Ca*',
                NET_SSH2_MSG_KEXDH_GEX_REQUEST,
                $dh_group_sizes_packed
            );
            if (!$this->_send_binary_packet($packet)) {
                return false;
            }

            $response = $this->_get_binary_packet();
            if ($response === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }
            if (!strlen($response)) {
                return false;
            }
            extract(unpack('Ctype', $this->_string_shift($response, 1)));
            if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) {
                user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP');
                return false;
            }

            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('NprimeLength', $this->_string_shift($response, 4)));
            $primeBytes = $this->_string_shift($response, $primeLength);
            $prime = new Math_BigInteger($primeBytes, -256);

            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('NgLength', $this->_string_shift($response, 4)));
            $gBytes = $this->_string_shift($response, $gLength);
            $g = new Math_BigInteger($gBytes, -256);

            $exchange_hash_rfc4419 = pack(
                'a*Na*Na*',
                $dh_group_sizes_packed,
                $primeLength,
                $primeBytes,
                $gLength,
                $gBytes
            );

            $clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT;
            $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY;
        } else {
            switch ($kex_algorithm) {
                // see http://tools.ietf.org/html/rfc2409#section-6.2 and
                // http://tools.ietf.org/html/rfc2412, appendex E
                case 'diffie-hellman-group1-sha1':
                    $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                            '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                            '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                            'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
                    break;
                // see http://tools.ietf.org/html/rfc3526#section-3
                case 'diffie-hellman-group14-sha1':
                    $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                            '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                            '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                            'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                            '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                            '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                            'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                            '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
                    break;
            }
            // For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1
            // the generator field element is 2 (decimal) and the hash function is sha1.
            $g = new Math_BigInteger(2);
            $prime = new Math_BigInteger($prime, 16);
            $exchange_hash_rfc4419 = '';
            $clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT;
            $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY;
        }

        switch ($kex_algorithm) {
            case 'diffie-hellman-group-exchange-sha256':
                $kexHash = new Crypt_Hash('sha256');
                break;
            default:
                $kexHash = new Crypt_Hash('sha1');
        }

        /* To increase the speed of the key exchange, both client and server may
           reduce the size of their private exponents.  It should be at least
           twice as long as the key material that is generated from the shared
           secret.  For more details, see the paper by van Oorschot and Wiener
           [VAN-OORSCHOT].

           -- http://tools.ietf.org/html/rfc4419#section-6.2 */
        $one = new Math_BigInteger(1);
        $keyLength = min($keyLength, $kexHash->getLength());
        $max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength
        $max = $max->subtract($one);

        $x = $one->random($one, $max);
        $e = $g->modPow($x, $prime);

        $eBytes = $e->toBytes(true);
        $data = pack('CNa*', $clientKexInitMessage, strlen($eBytes), $eBytes);

        if (!$this->_send_binary_packet($data)) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        $response = $this->_get_binary_packet();
        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }
        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        if ($type != $serverKexReplyMessage) {
            user_error('Expected SSH_MSG_KEXDH_REPLY');
            return false;
        }

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->server_public_host_key = $server_public_host_key = $this->_string_shift($response, $temp['length']);

        if (strlen($server_public_host_key) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
        $public_key_format = $this->_string_shift($server_public_host_key, $temp['length']);

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $fBytes = $this->_string_shift($response, $temp['length']);
        $f = new Math_BigInteger($fBytes, -256);

        if (strlen($response) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($response, 4));
        $this->signature = $this->_string_shift($response, $temp['length']);

        if (strlen($this->signature) < 4) {
            return false;
        }
        $temp = unpack('Nlength', $this->_string_shift($this->signature, 4));
        $this->signature_format = $this->_string_shift($this->signature, $temp['length']);

        $key = $f->modPow($x, $prime);
        $keyBytes = $key->toBytes(true);

        $this->exchange_hash = pack(
            'Na*Na*Na*Na*Na*a*Na*Na*Na*',
            strlen($this->identifier),
            $this->identifier,
            strlen($this->server_identifier),
            $this->server_identifier,
            strlen($kexinit_payload_client),
            $kexinit_payload_client,
            strlen($kexinit_payload_server),
            $kexinit_payload_server,
            strlen($this->server_public_host_key),
            $this->server_public_host_key,
            $exchange_hash_rfc4419,
            strlen($eBytes),
            $eBytes,
            strlen($fBytes),
            $fBytes,
            strlen($keyBytes),
            $keyBytes
        );

        $this->exchange_hash = $kexHash->hash($this->exchange_hash);

        if ($this->session_id === false) {
            $this->session_id = $this->exchange_hash;
        }

        $server_host_key_algorithm = $this->_array_intersect_first($server_host_key_algorithms, $this->server_host_key_algorithms);
        if ($server_host_key_algorithm === false) {
            user_error('No compatible server host key algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }

        switch ($server_host_key_algorithm) {
            case 'ssh-dss':
                $expected_key_format = 'ssh-dss';
                break;
            //case 'rsa-sha2-256':
            //case 'rsa-sha2-512':
            //case 'ssh-rsa':
            default:
                $expected_key_format = 'ssh-rsa';
        }

        if ($public_key_format != $expected_key_format || $this->signature_format != $server_host_key_algorithm) {
            switch (true) {
                case $this->signature_format == $server_host_key_algorithm:
                case $server_host_key_algorithm != 'rsa-sha2-256' && $server_host_key_algorithm != 'rsa-sha2-512':
                case $this->signature_format != 'ssh-rsa':
                    user_error('Server Host Key Algorithm Mismatch');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
            }
        }

        $packet = pack(
            'C',
            NET_SSH2_MSG_NEWKEYS
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $response = $this->_get_binary_packet();

        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        if ($type != NET_SSH2_MSG_NEWKEYS) {
            user_error('Expected SSH_MSG_NEWKEYS');
            return false;
        }

        $this->encrypt = $this->_encryption_algorithm_to_crypt_instance($encrypt);
        $this->decrypt = $this->_encryption_algorithm_to_crypt_instance($decrypt);

        $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);

        if ($this->encrypt) {
            if ($this->crypto_engine) {
                $this->encrypt->setPreferredEngine($this->crypto_engine);
            }
            $this->encrypt->enableContinuousBuffer();
            $this->encrypt->disablePadding();

            if ($this->encrypt->getBlockLength()) {
                $this->encrypt_block_size = $this->encrypt->getBlockLength() >> 3;
            }

            $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
            while ($this->encrypt_block_size > strlen($iv)) {
                $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
            }
            $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size));

            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id);
            while ($encryptKeyLength > strlen($key)) {
                $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
            }
            $this->encrypt->setKey(substr($key, 0, $encryptKeyLength));

            $this->encrypt->name = $decrypt;
        }

        if ($this->decrypt) {
            if ($this->crypto_engine) {
                $this->decrypt->setPreferredEngine($this->crypto_engine);
            }
            $this->decrypt->enableContinuousBuffer();
            $this->decrypt->disablePadding();

            if ($this->decrypt->getBlockLength()) {
                $this->decrypt_block_size = $this->decrypt->getBlockLength() >> 3;
            }

            $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
            while ($this->decrypt_block_size > strlen($iv)) {
                $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
            }
            $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size));

            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id);
            while ($decryptKeyLength > strlen($key)) {
                $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
            }
            $this->decrypt->setKey(substr($key, 0, $decryptKeyLength));

            $this->decrypt->name = $decrypt;
        }

        /* The "arcfour128" algorithm is the RC4 cipher, as described in
           [SCHNEIER], using a 128-bit key.  The first 1536 bytes of keystream
           generated by the cipher MUST be discarded, and the first byte of the
           first encrypted packet MUST be encrypted using the 1537th byte of
           keystream.

           -- http://tools.ietf.org/html/rfc4345#section-4 */
        if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') {
            $this->encrypt->encrypt(str_repeat("\0", 1536));
        }
        if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') {
            $this->decrypt->decrypt(str_repeat("\0", 1536));
        }

        $mac_algorithm = $this->_array_intersect_first($c2s_mac_algorithms, $this->mac_algorithms_client_to_server);
        if ($mac_algorithm === false) {
            user_error('No compatible client to server message authentication algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }

        $createKeyLength = 0; // ie. $mac_algorithm == 'none'
        switch ($mac_algorithm) {
            case 'hmac-sha2-256':
                $this->hmac_create = new Crypt_Hash('sha256');
                $createKeyLength = 32;
                break;
            case 'hmac-sha1':
                $this->hmac_create = new Crypt_Hash('sha1');
                $createKeyLength = 20;
                break;
            case 'hmac-sha1-96':
                $this->hmac_create = new Crypt_Hash('sha1-96');
                $createKeyLength = 20;
                break;
            case 'hmac-md5':
                $this->hmac_create = new Crypt_Hash('md5');
                $createKeyLength = 16;
                break;
            case 'hmac-md5-96':
                $this->hmac_create = new Crypt_Hash('md5-96');
                $createKeyLength = 16;
        }
        $this->hmac_create->name = $mac_algorithm;

        $mac_algorithm = $this->_array_intersect_first($s2c_mac_algorithms, $this->mac_algorithms_server_to_client);
        if ($mac_algorithm === false) {
            user_error('No compatible server to client message authentication algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }

        $checkKeyLength = 0;
        $this->hmac_size = 0;
        switch ($mac_algorithm) {
            case 'hmac-sha2-256':
                $this->hmac_check = new Crypt_Hash('sha256');
                $checkKeyLength = 32;
                $this->hmac_size = 32;
                break;
            case 'hmac-sha1':
                $this->hmac_check = new Crypt_Hash('sha1');
                $checkKeyLength = 20;
                $this->hmac_size = 20;
                break;
            case 'hmac-sha1-96':
                $this->hmac_check = new Crypt_Hash('sha1-96');
                $checkKeyLength = 20;
                $this->hmac_size = 12;
                break;
            case 'hmac-md5':
                $this->hmac_check = new Crypt_Hash('md5');
                $checkKeyLength = 16;
                $this->hmac_size = 16;
                break;
            case 'hmac-md5-96':
                $this->hmac_check = new Crypt_Hash('md5-96');
                $checkKeyLength = 16;
                $this->hmac_size = 12;
        }
        $this->hmac_check->name = $mac_algorithm;

        $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id);
        while ($createKeyLength > strlen($key)) {
            $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
        }
        $this->hmac_create->setKey(substr($key, 0, $createKeyLength));

        $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id);
        while ($checkKeyLength > strlen($key)) {
            $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
        }
        $this->hmac_check->setKey(substr($key, 0, $checkKeyLength));

        $compression_algorithm = $this->_array_intersect_first($c2s_compression_algorithms, $this->compression_algorithms_client_to_server);
        if ($compression_algorithm === false) {
            user_error('No compatible client to server compression algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }
        //$this->decompress = $compression_algorithm == 'zlib';

        $compression_algorithm = $this->_array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_client_to_server);
        if ($compression_algorithm === false) {
            user_error('No compatible server to client compression algorithms found');
            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
        }
        //$this->compress = $compression_algorithm == 'zlib';

        return true;
    }

    /**
     * Maps an encryption algorithm name to the number of key bytes.
     *
     * @param string $algorithm Name of the encryption algorithm
     * @return int|null Number of bytes as an integer or null for unknown
     * @access private
     */
    function _encryption_algorithm_to_key_size($algorithm)
    {
        if ($this->bad_key_size_fix && $this->_bad_algorithm_candidate($algorithm)) {
            return 16;
        }

        switch ($algorithm) {
            case 'none':
                return 0;
            case 'aes128-cbc':
            case 'aes128-ctr':
            case 'arcfour':
            case 'arcfour128':
            case 'blowfish-cbc':
            case 'blowfish-ctr':
            case 'twofish128-cbc':
            case 'twofish128-ctr':
                return 16;
            case '3des-cbc':
            case '3des-ctr':
            case 'aes192-cbc':
            case 'aes192-ctr':
            case 'twofish192-cbc':
            case 'twofish192-ctr':
                return 24;
            case 'aes256-cbc':
            case 'aes256-ctr':
            case 'arcfour256':
            case 'twofish-cbc':
            case 'twofish256-cbc':
            case 'twofish256-ctr':
                return 32;
        }
        return null;
    }

    /**
     * Maps an encryption algorithm name to an instance of a subclass of
     * \phpseclib\Crypt\Base.
     *
     * @param string $algorithm Name of the encryption algorithm
     * @return mixed Instance of \phpseclib\Crypt\Base or null for unknown
     * @access private
     */
    function _encryption_algorithm_to_crypt_instance($algorithm)
    {
        switch ($algorithm) {
            case '3des-cbc':
                if (!class_exists('Crypt_TripleDES')) {
                    include_once 'Crypt/TripleDES.php';
                }
                return new Crypt_TripleDES();
                break;
            case '3des-ctr':
                if (!class_exists('Crypt_TripleDES')) {
                    include_once 'Crypt/TripleDES.php';
                }
                return new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
                break;
            case 'aes256-cbc':
            case 'aes192-cbc':
            case 'aes128-cbc':
                if (!class_exists('Crypt_Rijndael')) {
                    include_once 'Crypt/Rijndael.php';
                }
                return new Crypt_Rijndael();
                break;
            case 'aes256-ctr':
            case 'aes192-ctr':
            case 'aes128-ctr':
                if (!class_exists('Crypt_Rijndael')) {
                    include_once 'Crypt/Rijndael.php';
                }
                return new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR);
                $this->encrypt_block_size = 16; // eg. 128 / 8
                break;
            case 'blowfish-cbc':
                if (!class_exists('Crypt_Blowfish')) {
                    include_once 'Crypt/Blowfish.php';
                }
                return new Crypt_Blowfish();
                break;
            case 'blowfish-ctr':
                if (!class_exists('Crypt_Blowfish')) {
                    include_once 'Crypt/Blowfish.php';
                }
                return new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
                break;
            case 'twofish128-cbc':
            case 'twofish192-cbc':
            case 'twofish256-cbc':
            case 'twofish-cbc':
                if (!class_exists('Crypt_Twofish')) {
                    include_once 'Crypt/Twofish.php';
                }
                return new Crypt_Twofish();
                break;
            case 'twofish128-ctr':
            case 'twofish192-ctr':
            case 'twofish256-ctr':
                if (!class_exists('Crypt_Twofish')) {
                    include_once 'Crypt/Twofish.php';
                }
                return new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
                break;
            case 'arcfour':
            case 'arcfour128':
            case 'arcfour256':
                if (!class_exists('Crypt_RC4')) {
                    include_once 'Crypt/RC4.php';
                }
                return new Crypt_RC4();
                break;
            case 'none':
                //return new Crypt_Null();
        }
        return null;
    }

    /**
     * Tests whether or not proposed algorithm has a potential for issues
     *
     * @link https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ssh2-aesctr-openssh.html
     * @link https://bugzilla.mindrot.org/show_bug.cgi?id=1291
     * @param string $algorithm Name of the encryption algorithm
     * @return bool
     * @access private
     */
    function _bad_algorithm_candidate($algorithm)
    {
        switch ($algorithm) {
            case 'arcfour256':
            case 'aes192-ctr':
            case 'aes256-ctr':
                return true;
        }

        return false;
    }

    /**
     * Login
     *
     * The $password parameter can be a plaintext password, a Crypt_RSA object or an array
     *
     * @param string $username
     * @param mixed $password
     * @param mixed $...
     * @return bool
     * @see self::_login()
     * @access public
     */
    function login($username)
    {
        $args = func_get_args();
        $this->auth[] = $args;
        return call_user_func_array(array(&$this, '_login'), $args);
    }

    /**
     * Login Helper
     *
     * @param string $username
     * @param mixed $password
     * @param mixed $...
     * @return bool
     * @see self::_login_helper()
     * @access private
     */
    function _login($username)
    {
        if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
            if (!$this->_connect()) {
                return false;
            }
        }

        $args = array_slice(func_get_args(), 1);
        if (empty($args)) {
            return $this->_login_helper($username);
        }

        foreach ($args as $arg) {
            if ($this->_login_helper($username, $arg)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Login Helper
     *
     * @param string $username
     * @param string $password
     * @return bool
     * @access private
     * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
     *           by sending dummy SSH_MSG_IGNORE messages.
     */
    function _login_helper($username, $password = null)
    {
        if (!($this->bitmap & NET_SSH2_MASK_CONNECTED)) {
            return false;
        }

        if (!($this->bitmap & NET_SSH2_MASK_LOGIN_REQ)) {
            $packet = pack(
                'CNa*',
                NET_SSH2_MSG_SERVICE_REQUEST,
                strlen('ssh-userauth'),
                'ssh-userauth'
            );

            if (!$this->_send_binary_packet($packet)) {
                return false;
            }

            $response = $this->_get_binary_packet();
            if ($response === false) {
                if ($this->retry_connect) {
                    $this->retry_connect = false;
                    if (!$this->_connect()) {
                        return false;
                    }
                    return $this->_login_helper($username, $password);
                }
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }

            if (strlen($response) < 4) {
                return false;
            }
            extract(unpack('Ctype', $this->_string_shift($response, 1)));

            if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) {
                user_error('Expected SSH_MSG_SERVICE_ACCEPT');
                return false;
            }
            $this->bitmap |= NET_SSH2_MASK_LOGIN_REQ;
        }

        if (strlen($this->last_interactive_response)) {
            return !is_string($password) && !is_array($password) ? false : $this->_keyboard_interactive_process($password);
        }

        // although PHP5's get_class() preserves the case, PHP4's does not
        if (is_object($password)) {
            switch (strtolower(get_class($password))) {
                case 'crypt_rsa':
                    return $this->_privatekey_login($username, $password);
                case 'system_ssh_agent':
                    return $this->_ssh_agent_login($username, $password);
            }
        }

        if (is_array($password)) {
            if ($this->_keyboard_interactive_login($username, $password)) {
                $this->bitmap |= NET_SSH2_MASK_LOGIN;
                return true;
            }
            return false;
        }

        if (!isset($password)) {
            $packet = pack(
                'CNa*Na*Na*',
                NET_SSH2_MSG_USERAUTH_REQUEST,
                strlen($username),
                $username,
                strlen('ssh-connection'),
                'ssh-connection',
                strlen('none'),
                'none'
            );

            if (!$this->_send_binary_packet($packet)) {
                return false;
            }

            $response = $this->_get_binary_packet();
            if ($response === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }

            if (!strlen($response)) {
                return false;
            }
            extract(unpack('Ctype', $this->_string_shift($response, 1)));

            switch ($type) {
                case NET_SSH2_MSG_USERAUTH_SUCCESS:
                    $this->bitmap |= NET_SSH2_MASK_LOGIN;
                    return true;
                //case NET_SSH2_MSG_USERAUTH_FAILURE:
                default:
                    return false;
            }
        }

        $packet = pack(
            'CNa*Na*Na*CNa*',
            NET_SSH2_MSG_USERAUTH_REQUEST,
            strlen($username),
            $username,
            strlen('ssh-connection'),
            'ssh-connection',
            strlen('password'),
            'password',
            0,
            strlen($password),
            $password
        );

        // remove the username and password from the logged packet
        if (!defined('NET_SSH2_LOGGING')) {
            $logged = null;
        } else {
            $logged = pack(
                'CNa*Na*Na*CNa*',
                NET_SSH2_MSG_USERAUTH_REQUEST,
                strlen('username'),
                'username',
                strlen('ssh-connection'),
                'ssh-connection',
                strlen('password'),
                'password',
                0,
                strlen('password'),
                'password'
            );
        }

        if (!$this->_send_binary_packet($packet, $logged)) {
            return false;
        }

        $response = $this->_get_binary_packet();
        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        switch ($type) {
            case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed
                if (defined('NET_SSH2_LOGGING')) {
                    $this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ';
                }
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . $this->_string_shift($response, $length);
                return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
            case NET_SSH2_MSG_USERAUTH_FAILURE:
                // can we use keyboard-interactive authentication?  if not then either the login is bad or the server employees
                // multi-factor authentication
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $auth_methods = explode(',', $this->_string_shift($response, $length));
                if (!strlen($response)) {
                    return false;
                }
                extract(unpack('Cpartial_success', $this->_string_shift($response, 1)));
                $partial_success = $partial_success != 0;

                if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) {
                    if ($this->_keyboard_interactive_login($username, $password)) {
                        $this->bitmap |= NET_SSH2_MASK_LOGIN;
                        return true;
                    }
                    return false;
                }
                return false;
            case NET_SSH2_MSG_USERAUTH_SUCCESS:
                $this->bitmap |= NET_SSH2_MASK_LOGIN;
                return true;
        }

        return false;
    }

    /**
     * Login via keyboard-interactive authentication
     *
     * See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details.  This is not a full-featured keyboard-interactive authenticator.
     *
     * @param string $username
     * @param string $password
     * @return bool
     * @access private
     */
    function _keyboard_interactive_login($username, $password)
    {
        $packet = pack(
            'CNa*Na*Na*Na*Na*',
            NET_SSH2_MSG_USERAUTH_REQUEST,
            strlen($username),
            $username,
            strlen('ssh-connection'),
            'ssh-connection',
            strlen('keyboard-interactive'),
            'keyboard-interactive',
            0,
            '',
            0,
            ''
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        return $this->_keyboard_interactive_process($password);
    }

    /**
     * Handle the keyboard-interactive requests / responses.
     *
     * @param string $responses...
     * @return bool
     * @access private
     */
    function _keyboard_interactive_process()
    {
        $responses = func_get_args();

        if (strlen($this->last_interactive_response)) {
            $response = $this->last_interactive_response;
        } else {
            $orig = $response = $this->_get_binary_packet();
            if ($response === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }
        }

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        switch ($type) {
            case NET_SSH2_MSG_USERAUTH_INFO_REQUEST:
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $this->_string_shift($response, $length); // name; may be empty
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $this->_string_shift($response, $length); // instruction; may be empty
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $this->_string_shift($response, $length); // language tag; may be empty
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nnum_prompts', $this->_string_shift($response, 4)));

                for ($i = 0; $i < count($responses); $i++) {
                    if (is_array($responses[$i])) {
                        foreach ($responses[$i] as $key => $value) {
                            $this->keyboard_requests_responses[$key] = $value;
                        }
                        unset($responses[$i]);
                    }
                }
                $responses = array_values($responses);

                if (isset($this->keyboard_requests_responses)) {
                    for ($i = 0; $i < $num_prompts; $i++) {
                        if (strlen($response) < 4) {
                            return false;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        // prompt - ie. "Password: "; must not be empty
                        $prompt = $this->_string_shift($response, $length);
                        //$echo = $this->_string_shift($response) != chr(0);
                        foreach ($this->keyboard_requests_responses as $key => $value) {
                            if (substr($prompt, 0, strlen($key)) == $key) {
                                $responses[] = $value;
                                break;
                            }
                        }
                    }
                }

                // see http://tools.ietf.org/html/rfc4256#section-3.2
                if (strlen($this->last_interactive_response)) {
                    $this->last_interactive_response = '';
                } elseif (defined('NET_SSH2_LOGGING')) {
                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
                        'UNKNOWN',
                        'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
                        $this->message_number_log[count($this->message_number_log) - 1]
                    );
                }

                if (!count($responses) && $num_prompts) {
                    $this->last_interactive_response = $orig;
                    return false;
                }

                /*
                   After obtaining the requested information from the user, the client
                   MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message.
                */
                // see http://tools.ietf.org/html/rfc4256#section-3.4
                $packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses));
                for ($i = 0; $i < count($responses); $i++) {
                    $packet.= pack('Na*', strlen($responses[$i]), $responses[$i]);
                    $logged.= pack('Na*', strlen('dummy-answer'), 'dummy-answer');
                }

                if (!$this->_send_binary_packet($packet, $logged)) {
                    return false;
                }

                if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
                        'UNKNOWN',
                        'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE',
                        $this->message_number_log[count($this->message_number_log) - 1]
                    );
                }

                /*
                   After receiving the response, the server MUST send either an
                   SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another
                   SSH_MSG_USERAUTH_INFO_REQUEST message.
                */
                // maybe phpseclib should force close the connection after x request / responses?  unless something like that is done
                // there could be an infinite loop of request / responses.
                return $this->_keyboard_interactive_process();
            case NET_SSH2_MSG_USERAUTH_SUCCESS:
                return true;
            case NET_SSH2_MSG_USERAUTH_FAILURE:
                return false;
        }

        return false;
    }

    /**
     * Login with an ssh-agent provided key
     *
     * @param string $username
     * @param System_SSH_Agent $agent
     * @return bool
     * @access private
     */
    function _ssh_agent_login($username, $agent)
    {
        $this->agent = $agent;
        $keys = $agent->requestIdentities();
        foreach ($keys as $key) {
            if ($this->_privatekey_login($username, $key)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Login with an RSA private key
     *
     * @param string $username
     * @param Crypt_RSA $password
     * @return bool
     * @access private
     * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
     *           by sending dummy SSH_MSG_IGNORE messages.
     */
    function _privatekey_login($username, $privatekey)
    {
        // see http://tools.ietf.org/html/rfc4253#page-15
        $publickey = $privatekey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_RAW);
        if ($publickey === false) {
            return false;
        }

        $publickey = array(
            'e' => $publickey['e']->toBytes(true),
            'n' => $publickey['n']->toBytes(true)
        );
        $publickey = pack(
            'Na*Na*Na*',
            strlen('ssh-rsa'),
            'ssh-rsa',
            strlen($publickey['e']),
            $publickey['e'],
            strlen($publickey['n']),
            $publickey['n']
        );

        switch ($this->signature_format) {
            case 'rsa-sha2-512':
                $hash = 'sha512';
                $signatureType = 'rsa-sha2-512';
                break;
            case 'rsa-sha2-256':
                $hash = 'sha256';
                $signatureType = 'rsa-sha2-256';
                break;
            //case 'ssh-rsa':
            default:
                $hash = 'sha1';
                $signatureType = 'ssh-rsa';
        }

        $part1 = pack(
            'CNa*Na*Na*',
            NET_SSH2_MSG_USERAUTH_REQUEST,
            strlen($username),
            $username,
            strlen('ssh-connection'),
            'ssh-connection',
            strlen('publickey'),
            'publickey'
        );
        $part2 = pack('Na*Na*', strlen($signatureType), $signatureType, strlen($publickey), $publickey);

        $packet = $part1 . chr(0) . $part2;
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $response = $this->_get_binary_packet();
        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        switch ($type) {
            case NET_SSH2_MSG_USERAUTH_FAILURE:
                if (strlen($response) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                $this->errors[] = 'SSH_MSG_USERAUTH_FAILURE: ' . $this->_string_shift($response, $length);
                return false;
            case NET_SSH2_MSG_USERAUTH_PK_OK:
                // we'll just take it on faith that the public key blob and the public key algorithm name are as
                // they should be
                if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
                        'UNKNOWN',
                        'NET_SSH2_MSG_USERAUTH_PK_OK',
                        $this->message_number_log[count($this->message_number_log) - 1]
                    );
                }
        }

        $packet = $part1 . chr(1) . $part2;
        $privatekey->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
        $privatekey->setHash($hash);
        $signature = $privatekey->sign(pack('Na*a*', strlen($this->session_id), $this->session_id, $packet));
        $signature = pack('Na*Na*', strlen($signatureType), $signatureType, strlen($signature), $signature);
        $packet.= pack('Na*', strlen($signature), $signature);

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $response = $this->_get_binary_packet();
        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (!strlen($response)) {
            return false;
        }
        extract(unpack('Ctype', $this->_string_shift($response, 1)));

        switch ($type) {
            case NET_SSH2_MSG_USERAUTH_FAILURE:
                // either the login is bad or the server employs multi-factor authentication
                return false;
            case NET_SSH2_MSG_USERAUTH_SUCCESS:
                $this->bitmap |= NET_SSH2_MASK_LOGIN;
                return true;
        }

        return false;
    }

    /**
     * Set Timeout
     *
     * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely.  setTimeout() makes it so it'll timeout.
     * Setting $timeout to false or 0 will mean there is no timeout.
     *
     * @param mixed $timeout
     * @access public
     */
    function setTimeout($timeout)
    {
        $this->timeout = $this->curTimeout = $timeout;
    }

    /**
     * Get the output from stdError
     *
     * @access public
     */
    function getStdError()
    {
        return $this->stdErrorLog;
    }

    /**
     * Execute Command
     *
     * If $callback is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually.
     * In all likelihood, this is not a feature you want to be taking advantage of.
     *
     * @param string $command
     * @param Callback $callback
     * @return string
     * @access public
     */
    function exec($command, $callback = null)
    {
        $this->curTimeout = $this->timeout;
        $this->is_timeout = false;
        $this->stdErrorLog = '';

        if (!$this->isAuthenticated()) {
            return false;
        }

        if ($this->in_request_pty_exec) {
            user_error('If you want to run multiple exec()\'s you will need to disable (and re-enable if appropriate) a PTY for each one.');
            return false;
        }

        // RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to
        // be adjusted".  0x7FFFFFFF is, at 2GB, the max size.  technically, it should probably be decremented, but,
        // honestly, if you're transferring more than 2GB, you probably shouldn't be using phpseclib, anyway.
        // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
        $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC] = $this->window_size;
        // 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy
        // uses 0x4000, that's what will be used here, as well.
        $packet_size = 0x4000;

        $packet = pack(
            'CNa*N3',
            NET_SSH2_MSG_CHANNEL_OPEN,
            strlen('session'),
            'session',
            NET_SSH2_CHANNEL_EXEC,
            $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC],
            $packet_size
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_OPEN;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
        if ($response === false) {
            return false;
        }

        if ($this->request_pty === true) {
            $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
            $packet = pack(
                'CNNa*CNa*N5a*',
                NET_SSH2_MSG_CHANNEL_REQUEST,
                $this->server_channels[NET_SSH2_CHANNEL_EXEC],
                strlen('pty-req'),
                'pty-req',
                1,
                strlen('vt100'),
                'vt100',
                $this->windowColumns,
                $this->windowRows,
                0,
                0,
                strlen($terminal_modes),
                $terminal_modes
            );

            if (!$this->_send_binary_packet($packet)) {
                return false;
            }

            $response = $this->_get_binary_packet();
            if ($response === false) {
                $this->bitmap = 0;
                user_error('Connection closed by server');
                return false;
            }

            if (!strlen($response)) {
                return false;
            }
            list(, $type) = unpack('C', $this->_string_shift($response, 1));

            switch ($type) {
                case NET_SSH2_MSG_CHANNEL_SUCCESS:
                    break;
                case NET_SSH2_MSG_CHANNEL_FAILURE:
                default:
                    user_error('Unable to request pseudo-terminal');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
            }
            $this->in_request_pty_exec = true;
        }

        // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things
        // down.  the one place where it might be desirable is if you're doing something like Net_SSH2::exec('ping localhost &').
        // with a pty-req SSH_MSG_CHANNEL_REQUEST, exec() will return immediately and the ping process will then
        // then immediately terminate.  without such a request exec() will loop indefinitely.  the ping process won't end but
        // neither will your script.

        // although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by
        // SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the
        // "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA.  RFC4254#section-5.2 corroborates.
        $packet = pack(
            'CNNa*CNa*',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $this->server_channels[NET_SSH2_CHANNEL_EXEC],
            strlen('exec'),
            'exec',
            1,
            strlen($command),
            $command
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
        if ($response === false) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;

        if ($callback === false || $this->in_request_pty_exec) {
            return true;
        }

        $output = '';
        while (true) {
            $temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
            switch (true) {
                case $temp === true:
                    return is_callable($callback) ? true : $output;
                case $temp === false:
                    return false;
                default:
                    if (is_callable($callback)) {
                        if (call_user_func($callback, $temp) === true) {
                            $this->_close_channel(NET_SSH2_CHANNEL_EXEC);
                            return true;
                        }
                    } else {
                        $output.= $temp;
                    }
            }
        }
    }

    /**
     * Creates an interactive shell
     *
     * @see self::read()
     * @see self::write()
     * @return bool
     * @access private
     */
    function _initShell()
    {
        if ($this->in_request_pty_exec === true) {
            return true;
        }

        $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = $this->window_size;
        $packet_size = 0x4000;

        $packet = pack(
            'CNa*N3',
            NET_SSH2_MSG_CHANNEL_OPEN,
            strlen('session'),
            'session',
            NET_SSH2_CHANNEL_SHELL,
            $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL],
            $packet_size
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
        if ($response === false) {
            return false;
        }

        $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
        $packet = pack(
            'CNNa*CNa*N5a*',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $this->server_channels[NET_SSH2_CHANNEL_SHELL],
            strlen('pty-req'),
            'pty-req',
            1,
            strlen('vt100'),
            'vt100',
            $this->windowColumns,
            $this->windowRows,
            0,
            0,
            strlen($terminal_modes),
            $terminal_modes
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $response = $this->_get_binary_packet();
        if ($response === false) {
            $this->bitmap = 0;
            user_error('Connection closed by server');
            return false;
        }

        if (!strlen($response)) {
            return false;
        }
        list(, $type) = unpack('C', $this->_string_shift($response, 1));

        switch ($type) {
            case NET_SSH2_MSG_CHANNEL_SUCCESS:
            // if a pty can't be opened maybe commands can still be executed
            case NET_SSH2_MSG_CHANNEL_FAILURE:
                break;
            default:
                user_error('Unable to request pseudo-terminal');
                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
        }

        $packet = pack(
            'CNNa*C',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $this->server_channels[NET_SSH2_CHANNEL_SHELL],
            strlen('shell'),
            'shell',
            1
        );
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
        if ($response === false) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA;

        $this->bitmap |= NET_SSH2_MASK_SHELL;

        return true;
    }

    /**
     * Return the channel to be used with read() / write()
     *
     * @see self::read()
     * @see self::write()
     * @return int
     * @access public
     */
    function _get_interactive_channel()
    {
        switch (true) {
            case $this->in_subsystem:
                return NET_SSH2_CHANNEL_SUBSYSTEM;
            case $this->in_request_pty_exec:
                return NET_SSH2_CHANNEL_EXEC;
            default:
                return NET_SSH2_CHANNEL_SHELL;
        }
    }

    /**
     * Return an available open channel
     *
     * @return int
     * @access public
     */
    function _get_open_channel()
    {
        $channel = NET_SSH2_CHANNEL_EXEC;
        do {
            if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_OPEN) {
                return $channel;
            }
        } while ($channel++ < NET_SSH2_CHANNEL_SUBSYSTEM);

        return false;
    }

    /**
     * Returns the output of an interactive shell
     *
     * Returns when there's a match for $expect, which can take the form of a string literal or,
     * if $mode == NET_SSH2_READ_REGEX, a regular expression.
     *
     * @see self::write()
     * @param string $expect
     * @param int $mode
     * @return string
     * @access public
     */
    function read($expect = '', $mode = NET_SSH2_READ_SIMPLE)
    {
        $this->curTimeout = $this->timeout;
        $this->is_timeout = false;

        if (!$this->isAuthenticated()) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
            user_error('Unable to initiate an interactive shell session');
            return false;
        }

        $channel = $this->_get_interactive_channel();

        if ($mode == NET_SSH2_READ_NEXT) {
            return $this->_get_channel_packet($channel);
        }

        $match = $expect;
        while (true) {
            if ($mode == NET_SSH2_READ_REGEX) {
                preg_match($expect, substr($this->interactiveBuffer, -1024), $matches);
                $match = isset($matches[0]) ? $matches[0] : '';
            }
            $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
            if ($pos !== false) {
                return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
            }
            $response = $this->_get_channel_packet($channel);
            if (is_bool($response)) {
                $this->in_request_pty_exec = false;
                return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false;
            }

            $this->interactiveBuffer.= $response;
        }
    }

    /**
     * Inputs a command into an interactive shell.
     *
     * @see self::read()
     * @param string $cmd
     * @return bool
     * @access public
     */
    function write($cmd)
    {
        if (!$this->isAuthenticated()) {
            user_error('Operation disallowed prior to login()');
            return false;
        }

        if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
            user_error('Unable to initiate an interactive shell session');
            return false;
        }

        return $this->_send_channel_packet($this->_get_interactive_channel(), $cmd);
    }

    /**
     * Start a subsystem.
     *
     * Right now only one subsystem at a time is supported. To support multiple subsystem's stopSubsystem() could accept
     * a string that contained the name of the subsystem, but at that point, only one subsystem of each type could be opened.
     * To support multiple subsystem's of the same name maybe it'd be best if startSubsystem() generated a new channel id and
     * returns that and then that that was passed into stopSubsystem() but that'll be saved for a future date and implemented
     * if there's sufficient demand for such a feature.
     *
     * @see self::stopSubsystem()
     * @param string $subsystem
     * @return bool
     * @access public
     */
    function startSubsystem($subsystem)
    {
        $this->window_size_server_to_client[NET_SSH2_CHANNEL_SUBSYSTEM] = $this->window_size;

        $packet = pack(
            'CNa*N3',
            NET_SSH2_MSG_CHANNEL_OPEN,
            strlen('session'),
            'session',
            NET_SSH2_CHANNEL_SUBSYSTEM,
            $this->window_size,
            0x4000
        );

        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_OPEN;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM);
        if ($response === false) {
            return false;
        }

        $packet = pack(
            'CNNa*CNa*',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $this->server_channels[NET_SSH2_CHANNEL_SUBSYSTEM],
            strlen('subsystem'),
            'subsystem',
            1,
            strlen($subsystem),
            $subsystem
        );
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_REQUEST;

        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM);

        if ($response === false) {
            return false;
        }

        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_DATA;

        $this->bitmap |= NET_SSH2_MASK_SHELL;
        $this->in_subsystem = true;

        return true;
    }

    /**
     * Stops a subsystem.
     *
     * @see self::startSubsystem()
     * @return bool
     * @access public
     */
    function stopSubsystem()
    {
        $this->in_subsystem = false;
        $this->_close_channel(NET_SSH2_CHANNEL_SUBSYSTEM);
        return true;
    }

    /**
     * Closes a channel
     *
     * If read() timed out you might want to just close the channel and have it auto-restart on the next read() call
     *
     * @access public
     */
    function reset()
    {
        $this->_close_channel($this->_get_interactive_channel());
    }

    /**
     * Is timeout?
     *
     * Did exec() or read() return because they timed out or because they encountered the end?
     *
     * @access public
     */
    function isTimeout()
    {
        return $this->is_timeout;
    }

    /**
     * Disconnect
     *
     * @access public
     */
    function disconnect()
    {
        $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
        if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) {
            fclose($this->realtime_log_file);
        }
    }

    /**
     * Destructor.
     *
     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
     * disconnect().
     *
     * @access public
     */
    function __destruct()
    {
        $this->disconnect();
    }

    /**
     * Is the connection still active?
     *
     * @return bool
     * @access public
     */
    function isConnected()
    {
        return (bool) ($this->bitmap & NET_SSH2_MASK_CONNECTED);
    }

    /**
     * Have you successfully been logged in?
     *
     * @return bool
     * @access public
     */
    function isAuthenticated()
    {
        return (bool) ($this->bitmap & NET_SSH2_MASK_LOGIN);
    }

    /**
     * Pings a server connection, or tries to reconnect if the connection has gone down
     *
     * Inspired by http://php.net/manual/en/mysqli.ping.php
     *
     * @return bool
     * @access public
     */
    function ping()
    {
        if (!$this->isAuthenticated()) {
            if (!empty($this->auth)) {
                return $this->_reconnect();
            }
            return false;
        }

        $this->window_size_server_to_client[NET_SSH2_CHANNEL_KEEP_ALIVE] = $this->window_size;
        $packet_size = 0x4000;
        $packet = pack(
            'CNa*N3',
            NET_SSH2_MSG_CHANNEL_OPEN,
            strlen('session'),
            'session',
            NET_SSH2_CHANNEL_KEEP_ALIVE,
            $this->window_size_server_to_client[NET_SSH2_CHANNEL_KEEP_ALIVE],
            $packet_size
        );

        if (!@$this->_send_binary_packet($packet)) {
            return $this->_reconnect();
        }

        $this->channel_status[NET_SSH2_CHANNEL_KEEP_ALIVE] = NET_SSH2_MSG_CHANNEL_OPEN;

        $response = @$this->_get_channel_packet(NET_SSH2_CHANNEL_KEEP_ALIVE);
        if ($response !== false) {
            $this->_close_channel(NET_SSH2_CHANNEL_KEEP_ALIVE);
            return true;
        }

        return $this->_reconnect();
    }

    /**
     * In situ reconnect method
     *
     * @return boolean
     * @access private
     */
    function _reconnect()
    {
        $this->_reset_connection(NET_SSH2_DISCONNECT_CONNECTION_LOST);
        $this->retry_connect = true;
        if (!$this->_connect()) {
            return false;
        }
        foreach ($this->auth as $auth) {
            $result = call_user_func_array(array(&$this, 'login'), $auth);
        }
        return $result;
    }

    /**
     * Resets a connection for re-use
     *
     * @param int $reason
     * @access private
     */
    function _reset_connection($reason)
    {
        $this->_disconnect($reason);
        $this->decrypt = $this->encrypt = false;
        $this->decrypt_block_size = $this->encrypt_block_size = 8;
        $this->hmac_check = $this->hmac_create = false;
        $this->hmac_size = false;
        $this->session_id = false;
        $this->retry_connect = true;
        $this->get_seq_no = $this->send_seq_no = 0;
    }

    /**
     * Gets Binary Packets
     *
     * See '6. Binary Packet Protocol' of rfc4253 for more info.
     *
     * @see self::_send_binary_packet()
     * @return string
     * @access private
     */
    function _get_binary_packet($skip_channel_filter = false)
    {
        if (!is_resource($this->fsock) || feof($this->fsock)) {
            $this->bitmap = 0;
            user_error('Connection closed prematurely');
            return false;
        }

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
        $raw = fread($this->fsock, $this->decrypt_block_size);

        if (!strlen($raw)) {
            return '';
        }

        if ($this->decrypt !== false) {
            $raw = $this->decrypt->decrypt($raw);
        }
        if ($raw === false) {
            user_error('Unable to decrypt content');
            return false;
        }

        if (strlen($raw) < 5) {
            return false;
        }
        extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5)));

        $remaining_length = $packet_length + 4 - $this->decrypt_block_size;

        // quoting ,
        // "implementations SHOULD check that the packet length is reasonable"
        // PuTTY uses 0x9000 as the actual max packet size and so to shall we
        if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) {
            if (!$this->bad_key_size_fix && $this->_bad_algorithm_candidate($this->decrypt->name) && !($this->bitmap & NET_SSH2_MASK_LOGIN)) {
                $this->bad_key_size_fix = true;
                $this->_reset_connection(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
                return false;
            }
            user_error('Invalid size');
            return false;
        }

        $buffer = '';
        while ($remaining_length > 0) {
            $temp = fread($this->fsock, $remaining_length);
            if ($temp === false || feof($this->fsock)) {
                $this->bitmap = 0;
                user_error('Error reading from socket');
                return false;
            }
            $buffer.= $temp;
            $remaining_length-= strlen($temp);
        }

        $stop = strtok(microtime(), ' ') + strtok('');
        if (strlen($buffer)) {
            $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer;
        }

        $payload = $this->_string_shift($raw, $packet_length - $padding_length - 1);
        $padding = $this->_string_shift($raw, $padding_length); // should leave $raw empty

        if ($this->hmac_check !== false) {
            $hmac = fread($this->fsock, $this->hmac_size);
            if ($hmac === false || strlen($hmac) != $this->hmac_size) {
                $this->bitmap = 0;
                user_error('Error reading socket');
                return false;
            } elseif ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) {
                user_error('Invalid HMAC');
                return false;
            }
        }

        //if ($this->decompress) {
        //    $payload = gzinflate(substr($payload, 2));
        //}

        $this->get_seq_no++;

        if (defined('NET_SSH2_LOGGING')) {
            $current = strtok(microtime(), ' ') + strtok('');
            $message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')';
            $message_number = '<- ' . $message_number .
                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
            $this->_append_log($message_number, $payload);
            $this->last_packet = $current;
        }

        return $this->_filter($payload, $skip_channel_filter);
    }

    /**
     * Filter Binary Packets
     *
     * Because some binary packets need to be ignored...
     *
     * @see self::_get_binary_packet()
     * @return string
     * @access private
     */
    function _filter($payload, $skip_channel_filter)
    {
        switch (ord($payload[0])) {
            case NET_SSH2_MSG_DISCONNECT:
                $this->_string_shift($payload, 1);
                if (strlen($payload) < 8) {
                    return false;
                }
                extract(unpack('Nreason_code/Nlength', $this->_string_shift($payload, 8)));
                $this->errors[] = 'SSH_MSG_DISCONNECT: ' . $this->disconnect_reasons[$reason_code] . "\r\n" . $this->_string_shift($payload, $length);
                $this->bitmap = 0;
                return false;
            case NET_SSH2_MSG_IGNORE:
                $payload = $this->_get_binary_packet($skip_channel_filter);
                break;
            case NET_SSH2_MSG_DEBUG:
                $this->_string_shift($payload, 2);
                if (strlen($payload) < 4) {
                    return false;
                }
                extract(unpack('Nlength', $this->_string_shift($payload, 4)));
                $this->errors[] = 'SSH_MSG_DEBUG: ' . $this->_string_shift($payload, $length);
                $payload = $this->_get_binary_packet($skip_channel_filter);
                break;
            case NET_SSH2_MSG_UNIMPLEMENTED:
                return false;
            case NET_SSH2_MSG_KEXINIT:
                if ($this->session_id !== false) {
                    $this->send_kex_first = false;
                    if (!$this->_key_exchange($payload)) {
                        $this->bitmap = 0;
                        return false;
                    }
                    $payload = $this->_get_binary_packet($skip_channel_filter);
                }
        }

        // see http://tools.ietf.org/html/rfc4252#section-5.4; only called when the encryption has been activated and when we haven't already logged in
        if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && !$this->isAuthenticated() && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) {
            $this->_string_shift($payload, 1);
            if (strlen($payload) < 4) {
                return false;
            }
            extract(unpack('Nlength', $this->_string_shift($payload, 4)));
            $this->banner_message = $this->_string_shift($payload, $length);
            $payload = $this->_get_binary_packet();
        }

        // only called when we've already logged in
        if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && $this->isAuthenticated()) {
            switch (ord($payload[0])) {
                case NET_SSH2_MSG_CHANNEL_DATA:
                case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
                case NET_SSH2_MSG_CHANNEL_REQUEST:
                case NET_SSH2_MSG_CHANNEL_CLOSE:
                case NET_SSH2_MSG_CHANNEL_EOF:
                    if (!$skip_channel_filter && !empty($this->server_channels)) {
                        $this->binary_packet_buffer = $payload;
                        $this->_get_channel_packet(true);
                        $payload = $this->_get_binary_packet();
                    }
                    break;
                case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4
                    if (strlen($payload) < 4) {
                        return false;
                    }
                    extract(unpack('Nlength', $this->_string_shift($payload, 4)));
                    $this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . $this->_string_shift($payload, $length);

                    if (!$this->_send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE))) {
                        return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
                    }

                    $payload = $this->_get_binary_packet($skip_channel_filter);
                    break;
                case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1
                    $this->_string_shift($payload, 1);
                    if (strlen($payload) < 4) {
                        return false;
                    }
                    extract(unpack('Nlength', $this->_string_shift($payload, 4)));
                    $data = $this->_string_shift($payload, $length);
                    if (strlen($payload) < 4) {
                        return false;
                    }
                    extract(unpack('Nserver_channel', $this->_string_shift($payload, 4)));
                    switch ($data) {
                        case 'auth-agent':
                        case 'auth-agent@openssh.com':
                            if (isset($this->agent)) {
                                $new_channel = NET_SSH2_CHANNEL_AGENT_FORWARD;

                                if (strlen($payload) < 8) {
                                    return false;
                                }
                                extract(unpack('Nremote_window_size', $this->_string_shift($payload, 4)));
                                extract(unpack('Nremote_maximum_packet_size', $this->_string_shift($payload, 4)));

                                $this->packet_size_client_to_server[$new_channel] = $remote_window_size;
                                $this->window_size_server_to_client[$new_channel] = $remote_maximum_packet_size;
                                $this->window_size_client_to_server[$new_channel] = $this->window_size;

                                $packet_size = 0x4000;

                                $packet = pack(
                                    'CN4',
                                    NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
                                    $server_channel,
                                    $new_channel,
                                    $packet_size,
                                    $packet_size
                                );

                                $this->server_channels[$new_channel] = $server_channel;
                                $this->channel_status[$new_channel] = NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION;
                                if (!$this->_send_binary_packet($packet)) {
                                    return false;
                                }
                            }
                            break;
                        default:
                            $packet = pack(
                                'CN3a*Na*',
                                NET_SSH2_MSG_REQUEST_FAILURE,
                                $server_channel,
                                NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED,
                                0,
                                '',
                                0,
                                ''
                            );

                            if (!$this->_send_binary_packet($packet)) {
                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
                            }
                    }
                    $payload = $this->_get_binary_packet($skip_channel_filter);
                    break;
                case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST:
                    $this->_string_shift($payload, 1);
                    if (strlen($payload) < 8) {
                        return false;
                    }
                    extract(unpack('Nchannel', $this->_string_shift($payload, 4)));
                    extract(unpack('Nwindow_size', $this->_string_shift($payload, 4)));
                    $this->window_size_client_to_server[$channel]+= $window_size;

                    $payload = ($this->bitmap & NET_SSH2_MASK_WINDOW_ADJUST) ? true : $this->_get_binary_packet($skip_channel_filter);
            }
        }

        return $payload;
    }

    /**
     * Enable Quiet Mode
     *
     * Suppress stderr from output
     *
     * @access public
     */
    function enableQuietMode()
    {
        $this->quiet_mode = true;
    }

    /**
     * Disable Quiet Mode
     *
     * Show stderr in output
     *
     * @access public
     */
    function disableQuietMode()
    {
        $this->quiet_mode = false;
    }

    /**
     * Returns whether Quiet Mode is enabled or not
     *
     * @see self::enableQuietMode()
     * @see self::disableQuietMode()
     *
     * @access public
     * @return bool
     */
    function isQuietModeEnabled()
    {
        return $this->quiet_mode;
    }

    /**
     * Enable request-pty when using exec()
     *
     * @access public
     */
    function enablePTY()
    {
        $this->request_pty = true;
    }

    /**
     * Disable request-pty when using exec()
     *
     * @access public
     */
    function disablePTY()
    {
        if ($this->in_request_pty_exec) {
            $this->_close_channel(NET_SSH2_CHANNEL_EXEC);
            $this->in_request_pty_exec = false;
        }
        $this->request_pty = false;
    }

    /**
     * Returns whether request-pty is enabled or not
     *
     * @see self::enablePTY()
     * @see self::disablePTY()
     *
     * @access public
     * @return bool
     */
    function isPTYEnabled()
    {
        return $this->request_pty;
    }

    /**
     * Gets channel data
     *
     * Returns the data as a string if it's available and false if not.
     *
     * @param $client_channel
     * @return mixed
     * @access private
     */
    function _get_channel_packet($client_channel, $skip_extended = false)
    {
        if (!empty($this->channel_buffers[$client_channel])) {
            return array_shift($this->channel_buffers[$client_channel]);
        }

        while (true) {
            if ($this->binary_packet_buffer !== false) {
                $response = $this->binary_packet_buffer;
                $this->binary_packet_buffer = false;
            } else {
                $read = array($this->fsock);
                $write = $except = null;

                if (!$this->curTimeout) {
                    @stream_select($read, $write, $except, null);
                } else {
                    if ($this->curTimeout < 0) {
                        $this->is_timeout = true;
                        return true;
                    }

                    $read = array($this->fsock);
                    $write = $except = null;

                    $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
                    $sec = floor($this->curTimeout);
                    $usec = 1000000 * ($this->curTimeout - $sec);
                    // on windows this returns a "Warning: Invalid CRT parameters detected" error
                    if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
                        $this->is_timeout = true;
                        if ($client_channel == NET_SSH2_CHANNEL_EXEC && !$this->request_pty) {
                            $this->_close_channel($client_channel);
                        }
                        return true;
                    }
                    $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
                    $this->curTimeout-= $elapsed;
                }

                $response = $this->_get_binary_packet(true);
                if ($response === false) {
                    $this->bitmap = 0;
                    user_error('Connection closed by server');
                    return false;
                }
            }

            if ($client_channel == -1 && $response === true) {
                return true;
            }
            if (!strlen($response)) {
                return false;
            }
            extract(unpack('Ctype', $this->_string_shift($response, 1)));

            if (strlen($response) < 4) {
                return false;
            }
            if ($type == NET_SSH2_MSG_CHANNEL_OPEN) {
                extract(unpack('Nlength', $this->_string_shift($response, 4)));
            } else {
                extract(unpack('Nchannel', $this->_string_shift($response, 4)));
            }

            // will not be setup yet on incoming channel open request
            if (isset($channel) && isset($this->channel_status[$channel]) && isset($this->window_size_server_to_client[$channel])) {
                $this->window_size_server_to_client[$channel]-= strlen($response);

                // resize the window, if appropriate
                if ($this->window_size_server_to_client[$channel] < 0) {
                    $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size);
                    if (!$this->_send_binary_packet($packet)) {
                        return false;
                    }
                    $this->window_size_server_to_client[$channel]+= $this->window_size;
                }

                switch ($type) {
                    case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
                        /*
                        if ($client_channel == NET_SSH2_CHANNEL_EXEC) {
                            $this->_send_channel_packet($client_channel, chr(0));
                        }
                        */
                        // currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR
                        if (strlen($response) < 8) {
                            return false;
                        }
                        extract(unpack('Ndata_type_code/Nlength', $this->_string_shift($response, 8)));
                        $data = $this->_string_shift($response, $length);
                        $this->stdErrorLog.= $data;
                        if ($skip_extended || $this->quiet_mode) {
                            continue 2;
                        }
                        if ($client_channel == $channel && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA) {
                            return $data;
                        }
                        if (!isset($this->channel_buffers[$channel])) {
                            $this->channel_buffers[$channel] = array();
                        }
                        $this->channel_buffers[$channel][] = $data;

                        continue 2;
                    case NET_SSH2_MSG_CHANNEL_REQUEST:
                        if ($this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_CLOSE) {
                            continue 2;
                        }
                        if (strlen($response) < 4) {
                            return false;
                        }
                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
                        $value = $this->_string_shift($response, $length);
                        switch ($value) {
                            case 'exit-signal':
                                $this->_string_shift($response, 1);
                                if (strlen($response) < 4) {
                                    return false;
                                }
                                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                                $this->errors[] = 'SSH_MSG_CHANNEL_REQUEST (exit-signal): ' . $this->_string_shift($response, $length);
                                $this->_string_shift($response, 1);
                                if (strlen($response) < 4) {
                                    return false;
                                }
                                extract(unpack('Nlength', $this->_string_shift($response, 4)));
                                if ($length) {
                                    $this->errors[count($this->errors)].= "\r\n" . $this->_string_shift($response, $length);
                                }

                                $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
                                $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));

                                $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF;

                                continue 3;
                            case 'exit-status':
                                if (strlen($response) < 5) {
                                    return false;
                                }
                                extract(unpack('Cfalse/Nexit_status', $this->_string_shift($response, 5)));
                                $this->exit_status = $exit_status;

                                // "The client MAY ignore these messages."
                                // -- http://tools.ietf.org/html/rfc4254#section-6.10

                                continue 3;
                            default:
                                // "Some systems may not implement signals, in which case they SHOULD ignore this message."
                                //  -- http://tools.ietf.org/html/rfc4254#section-6.9
                                continue 3;
                        }
                }

                switch ($this->channel_status[$channel]) {
                    case NET_SSH2_MSG_CHANNEL_OPEN:
                        switch ($type) {
                            case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
                                if (strlen($response) < 4) {
                                    return false;
                                }
                                extract(unpack('Nserver_channel', $this->_string_shift($response, 4)));
                                $this->server_channels[$channel] = $server_channel;
                                if (strlen($response) < 4) {
                                    return false;
                                }
                                extract(unpack('Nwindow_size', $this->_string_shift($response, 4)));
                                if ($window_size < 0) {
                                    $window_size&= 0x7FFFFFFF;
                                    $window_size+= 0x80000000;
                                }
                                $this->window_size_client_to_server[$channel] = $window_size;
                                if (strlen($response) < 4) {
                                     return false;
                                }
                                $temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4));
                                $this->packet_size_client_to_server[$channel] = $temp['packet_size_client_to_server'];
                                $result = $client_channel == $channel ? true : $this->_get_channel_packet($client_channel, $skip_extended);
                                $this->_on_channel_open();
                                return $result;
                            //case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE:
                            default:
                                user_error('Unable to open channel');
                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
                        }
                        break;
                    case NET_SSH2_MSG_CHANNEL_REQUEST:
                        switch ($type) {
                            case NET_SSH2_MSG_CHANNEL_SUCCESS:
                                return true;
                            case NET_SSH2_MSG_CHANNEL_FAILURE:
                                return false;
                            default:
                                user_error('Unable to fulfill channel request');
                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
                        }
                    case NET_SSH2_MSG_CHANNEL_CLOSE:
                        return $type == NET_SSH2_MSG_CHANNEL_CLOSE ? true : $this->_get_channel_packet($client_channel, $skip_extended);
                }
            }

            // ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA

            switch ($type) {
                case NET_SSH2_MSG_CHANNEL_DATA:
                    /*
                    if ($channel == NET_SSH2_CHANNEL_EXEC) {
                        // SCP requires null packets, such as this, be sent.  further, in the case of the ssh.com SSH server
                        // this actually seems to make things twice as fast.  more to the point, the message right after
                        // SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise.
                        // in OpenSSH it slows things down but only by a couple thousandths of a second.
                        $this->_send_channel_packet($channel, chr(0));
                    }
                    */
                    if (strlen($response) < 4) {
                        return false;
                    }
                    extract(unpack('Nlength', $this->_string_shift($response, 4)));
                    $data = $this->_string_shift($response, $length);

                    if ($channel == NET_SSH2_CHANNEL_AGENT_FORWARD) {
                        $agent_response = $this->agent->_forward_data($data);
                        if (!is_bool($agent_response)) {
                            $this->_send_channel_packet($channel, $agent_response);
                        }
                        break;
                    }

                    if ($client_channel == $channel) {
                        return $data;
                    }
                    if (!isset($this->channel_buffers[$channel])) {
                        $this->channel_buffers[$channel] = array();
                    }
                    $this->channel_buffers[$channel][] = $data;
                    break;
                case NET_SSH2_MSG_CHANNEL_CLOSE:
                    $this->curTimeout = 0;

                    if ($this->bitmap & NET_SSH2_MASK_SHELL) {
                        $this->bitmap&= ~NET_SSH2_MASK_SHELL;
                    }
                    if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) {
                        $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
                    }

                    $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
                    if ($client_channel == $channel) {
                        return true;
                    }
                case NET_SSH2_MSG_CHANNEL_EOF:
                    break;
                default:
                    user_error('Error reading channel data');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
            }
        }
    }

    /**
     * Sends Binary Packets
     *
     * See '6. Binary Packet Protocol' of rfc4253 for more info.
     *
     * @param string $data
     * @param string $logged
     * @see self::_get_binary_packet()
     * @return bool
     * @access private
     */
    function _send_binary_packet($data, $logged = null)
    {
        if (!is_resource($this->fsock) || feof($this->fsock)) {
            $this->bitmap = 0;
            user_error('Connection closed prematurely');
            return false;
        }

        //if ($this->compress) {
        //    // the -4 removes the checksum:
        //    // http://php.net/function.gzcompress#57710
        //    $data = substr(gzcompress($data), 0, -4);
        //}

        // 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9
        $packet_length = strlen($data) + 9;
        // round up to the nearest $this->encrypt_block_size
        $packet_length+= (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size;
        // subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length
        $padding_length = $packet_length - strlen($data) - 5;
        $padding = crypt_random_string($padding_length);

        // we subtract 4 from packet_length because the packet_length field isn't supposed to include itself
        $packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding);

        $hmac = $this->hmac_create !== false ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : '';
        $this->send_seq_no++;

        if ($this->encrypt !== false) {
            $packet = $this->encrypt->encrypt($packet);
        }

        $packet.= $hmac;

        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
        $result = strlen($packet) == fputs($this->fsock, $packet);
        $stop = strtok(microtime(), ' ') + strtok('');

        if (defined('NET_SSH2_LOGGING')) {
            $current = strtok(microtime(), ' ') + strtok('');
            $message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')';
            $message_number = '-> ' . $message_number .
                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
            $this->_append_log($message_number, isset($logged) ? $logged : $data);
            $this->last_packet = $current;
        }

        return $result;
    }

    /**
     * Logs data packets
     *
     * Makes sure that only the last 1MB worth of packets will be logged
     *
     * @param string $data
     * @access private
     */
    function _append_log($message_number, $message)
    {
        // remove the byte identifying the message type from all but the first two messages (ie. the identification strings)
        if (strlen($message_number) > 2) {
            $this->_string_shift($message);
        }

        switch (NET_SSH2_LOGGING) {
            // useful for benchmarks
            case NET_SSH2_LOG_SIMPLE:
                $this->message_number_log[] = $message_number;
                break;
            // the most useful log for SSH2
            case NET_SSH2_LOG_COMPLEX:
                $this->message_number_log[] = $message_number;
                $this->log_size+= strlen($message);
                $this->message_log[] = $message;
                while ($this->log_size > NET_SSH2_LOG_MAX_SIZE) {
                    $this->log_size-= strlen(array_shift($this->message_log));
                    array_shift($this->message_number_log);
                }
                break;
            // dump the output out realtime; packets may be interspersed with non packets,
            // passwords won't be filtered out and select other packets may not be correctly
            // identified
            case NET_SSH2_LOG_REALTIME:
                switch (PHP_SAPI) {
                    case 'cli':
                        $start = $stop = "\r\n";
                        break;
                    default:
                        $start = '
';
                        $stop = '
';
                }
                echo $start . $this->_format_log(array($message), array($message_number)) . $stop;
                @flush();
                @ob_flush();
                break;
            // basically the same thing as NET_SSH2_LOG_REALTIME with the caveat that NET_SSH2_LOG_REALTIME_FILE
            // needs to be defined and that the resultant log file will be capped out at NET_SSH2_LOG_MAX_SIZE.
            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
            // at the beginning of the file
            case NET_SSH2_LOG_REALTIME_FILE:
                if (!isset($this->realtime_log_file)) {
                    // PHP doesn't seem to like using constants in fopen()
                    $filename = NET_SSH2_LOG_REALTIME_FILENAME;
                    $fp = fopen($filename, 'w');
                    $this->realtime_log_file = $fp;
                }
                if (!is_resource($this->realtime_log_file)) {
                    break;
                }
                $entry = $this->_format_log(array($message), array($message_number));
                if ($this->realtime_log_wrap) {
                    $temp = "<<< START >>>\r\n";
                    $entry.= $temp;
                    fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
                }
                $this->realtime_log_size+= strlen($entry);
                if ($this->realtime_log_size > NET_SSH2_LOG_MAX_SIZE) {
                    fseek($this->realtime_log_file, 0);
                    $this->realtime_log_size = strlen($entry);
                    $this->realtime_log_wrap = true;
                }
                fputs($this->realtime_log_file, $entry);
        }
    }

    /**
     * Sends channel data
     *
     * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate
     *
     * @param int $client_channel
     * @param string $data
     * @return bool
     * @access private
     */
    function _send_channel_packet($client_channel, $data)
    {
        while (strlen($data)) {
            if (!$this->window_size_client_to_server[$client_channel]) {
                $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
                // using an invalid channel will let the buffers be built up for the valid channels
                $this->_get_channel_packet(-1);
                $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
            }

            /* The maximum amount of data allowed is determined by the maximum
               packet size for the channel, and the current window size, whichever
               is smaller.
                 -- http://tools.ietf.org/html/rfc4254#section-5.2 */
            $max_size = min(
                $this->packet_size_client_to_server[$client_channel],
                $this->window_size_client_to_server[$client_channel]
            );

            $temp = $this->_string_shift($data, $max_size);
            $packet = pack(
                'CN2a*',
                NET_SSH2_MSG_CHANNEL_DATA,
                $this->server_channels[$client_channel],
                strlen($temp),
                $temp
            );
            $this->window_size_client_to_server[$client_channel]-= strlen($temp);
            if (!$this->_send_binary_packet($packet)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Closes and flushes a channel
     *
     * Net_SSH2 doesn't properly close most channels.  For exec() channels are normally closed by the server
     * and for SFTP channels are presumably closed when the client disconnects.  This functions is intended
     * for SCP more than anything.
     *
     * @param int $client_channel
     * @param bool $want_reply
     * @return bool
     * @access private
     */
    function _close_channel($client_channel, $want_reply = false)
    {
        // see http://tools.ietf.org/html/rfc4254#section-5.3

        $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));

        if (!$want_reply) {
            $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
        }

        $this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE;

        $this->curTimeout = 0;

        while (!is_bool($this->_get_channel_packet($client_channel))) {
        }

        if ($want_reply) {
            $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
        }

        if ($this->bitmap & NET_SSH2_MASK_SHELL) {
            $this->bitmap&= ~NET_SSH2_MASK_SHELL;
        }
    }

    /**
     * Disconnect
     *
     * @param int $reason
     * @return bool
     * @access private
     */
    function _disconnect($reason)
    {
        if ($this->bitmap & NET_SSH2_MASK_CONNECTED) {
            $data = pack('CNNa*Na*', NET_SSH2_MSG_DISCONNECT, $reason, 0, '', 0, '');
            $this->_send_binary_packet($data);
        }

        $this->bitmap = 0;
        if (is_resource($this->fsock) && get_resource_type($this->fsock) == 'stream') {
            fclose($this->fsock);
        }

        return false;
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }

    /**
     * Define Array
     *
     * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
     * named constants from it, using the value as the name of the constant and the index as the value of the constant.
     * If any of the constants that would be defined already exists, none of the constants will be defined.
     *
     * @param array $array
     * @access private
     */
    function _define_array()
    {
        $args = func_get_args();
        foreach ($args as $arg) {
            foreach ($arg as $key => $value) {
                if (!defined($value)) {
                    define($value, $key);
                } else {
                    break 2;
                }
            }
        }
    }

    /**
     * Returns a log of the packets that have been sent and received.
     *
     * Returns a string if NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX, an array if NET_SSH2_LOGGING == NET_SSH2_LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING')
     *
     * @access public
     * @return array|false|string
     */
    function getLog()
    {
        if (!defined('NET_SSH2_LOGGING')) {
            return false;
        }

        switch (NET_SSH2_LOGGING) {
            case NET_SSH2_LOG_SIMPLE:
                return $this->message_number_log;
            case NET_SSH2_LOG_COMPLEX:
                $log = $this->_format_log($this->message_log, $this->message_number_log);
                return PHP_SAPI == 'cli' ? $log : '
' . $log . '
';
            default:
                return false;
        }
    }

    /**
     * Formats a log for printing
     *
     * @param array $message_log
     * @param array $message_number_log
     * @access private
     * @return string
     */
    function _format_log($message_log, $message_number_log)
    {
        $output = '';
        for ($i = 0; $i < count($message_log); $i++) {
            $output.= $message_number_log[$i] . "\r\n";
            $current_log = $message_log[$i];
            $j = 0;
            do {
                if (strlen($current_log)) {
                    $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
                }
                $fragment = $this->_string_shift($current_log, $this->log_short_width);
                $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary));
                // replace non ASCII printable characters with dots
                // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
                // also replace < with a . since < messes up the output on web browsers
                $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
                $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
                $j++;
            } while (strlen($current_log));
            $output.= "\r\n";
        }

        return $output;
    }

    /**
     * Helper function for _format_log
     *
     * For use with preg_replace_callback()
     *
     * @param array $matches
     * @access private
     * @return string
     */
    function _format_log_helper($matches)
    {
        return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
    }

    /**
     * Helper function for agent->_on_channel_open()
     *
     * Used when channels are created to inform agent
     * of said channel opening. Must be called after
     * channel open confirmation received
     *
     * @access private
     */
    function _on_channel_open()
    {
        if (isset($this->agent)) {
            $this->agent->_on_channel_open($this);
        }
    }

    /**
     * Returns the first value of the intersection of two arrays or false if
     * the intersection is empty. The order is defined by the first parameter.
     *
     * @param array $array1
     * @param array $array2
     * @return mixed False if intersection is empty, else intersected value.
     * @access private
     */
    function _array_intersect_first($array1, $array2)
    {
        foreach ($array1 as $value) {
            if (in_array($value, $array2)) {
                return $value;
            }
        }
        return false;
    }

    /**
     * Returns all errors
     *
     * @return string[]
     * @access public
     */
    function getErrors()
    {
        return $this->errors;
    }

    /**
     * Returns the last error
     *
     * @return string
     * @access public
     */
    function getLastError()
    {
        $count = count($this->errors);

        if ($count > 0) {
            return $this->errors[$count - 1];
        }
    }

    /**
     * Return the server identification.
     *
     * @return string
     * @access public
     */
    function getServerIdentification()
    {
        $this->_connect();

        return $this->server_identifier;
    }

    /**
     * Return a list of the key exchange algorithms the server supports.
     *
     * @return array
     * @access public
     */
    function getKexAlgorithms()
    {
        $this->_connect();

        return $this->kex_algorithms;
    }

    /**
     * Return a list of the host key (public key) algorithms the server supports.
     *
     * @return array
     * @access public
     */
    function getServerHostKeyAlgorithms()
    {
        $this->_connect();

        return $this->server_host_key_algorithms;
    }

    /**
     * Return a list of the (symmetric key) encryption algorithms the server supports, when receiving stuff from the client.
     *
     * @return array
     * @access public
     */
    function getEncryptionAlgorithmsClient2Server()
    {
        $this->_connect();

        return $this->encryption_algorithms_client_to_server;
    }

    /**
     * Return a list of the (symmetric key) encryption algorithms the server supports, when sending stuff to the client.
     *
     * @return array
     * @access public
     */
    function getEncryptionAlgorithmsServer2Client()
    {
        $this->_connect();

        return $this->encryption_algorithms_server_to_client;
    }

    /**
     * Return a list of the MAC algorithms the server supports, when receiving stuff from the client.
     *
     * @return array
     * @access public
     */
    function getMACAlgorithmsClient2Server()
    {
        $this->_connect();

        return $this->mac_algorithms_client_to_server;
    }

    /**
     * Return a list of the MAC algorithms the server supports, when sending stuff to the client.
     *
     * @return array
     * @access public
     */
    function getMACAlgorithmsServer2Client()
    {
        $this->_connect();

        return $this->mac_algorithms_server_to_client;
    }

    /**
     * Return a list of the compression algorithms the server supports, when receiving stuff from the client.
     *
     * @return array
     * @access public
     */
    function getCompressionAlgorithmsClient2Server()
    {
        $this->_connect();

        return $this->compression_algorithms_client_to_server;
    }

    /**
     * Return a list of the compression algorithms the server supports, when sending stuff to the client.
     *
     * @return array
     * @access public
     */
    function getCompressionAlgorithmsServer2Client()
    {
        $this->_connect();

        return $this->compression_algorithms_server_to_client;
    }

    /**
     * Return a list of the languages the server supports, when sending stuff to the client.
     *
     * @return array
     * @access public
     */
    function getLanguagesServer2Client()
    {
        $this->_connect();

        return $this->languages_server_to_client;
    }

    /**
     * Return a list of the languages the server supports, when receiving stuff from the client.
     *
     * @return array
     * @access public
     */
    function getLanguagesClient2Server()
    {
        $this->_connect();

        return $this->languages_client_to_server;
    }

    /**
     * Returns a list of algorithms the server supports
     *
     * @return array
     * @access public
     */
    public function getServerAlgorithms()
    {
        $this->_connect();

        return array(
            'kex' => $this->kex_algorithms,
            'hostkey' => $this->server_host_key_algorithms,
            'client_to_server' => array(
                'crypt' => $this->encryption_algorithms_client_to_server,
                'mac' => $this->mac_algorithms_client_to_server,
                'comp' => $this->compression_algorithms_client_to_server,
                'lang' => $this->languages_client_to_server
            ),
            'server_to_client' => array(
                'crypt' => $this->encryption_algorithms_server_to_client,
                'mac' => $this->mac_algorithms_server_to_client,
                'comp' => $this->compression_algorithms_server_to_client,
                'lang' => $this->languages_server_to_client
            )
        );
    }

    /**
     * Returns a list of KEX algorithms that phpseclib supports
     *
     * @return array
     * @access public
     */
    function getSupportedKEXAlgorithms()
    {
        $kex_algorithms = array(
            'diffie-hellman-group-exchange-sha256',// RFC 4419
            'diffie-hellman-group-exchange-sha1',  // RFC 4419

            // Diffie-Hellman Key Agreement (DH) using integer modulo prime
            // groups.
            'diffie-hellman-group14-sha1', // REQUIRED
            'diffie-hellman-group1-sha1', // REQUIRED
        );

        return $kex_algorithms;
    }

    /**
     * Returns a list of host key algorithms that phpseclib supports
     *
     * @return array
     * @access public
     */
    function getSupportedHostKeyAlgorithms()
    {
        return array(
            'rsa-sha2-256', // RFC 8332
            'rsa-sha2-512', // RFC 8332
            'ssh-rsa', // RECOMMENDED  sign   Raw RSA Key
            'ssh-dss'  // REQUIRED     sign   Raw DSS Key
        );
    }

    /**
     * Returns a list of symmetric key algorithms that phpseclib supports
     *
     * @return array
     * @access public
     */
    function getSupportedEncryptionAlgorithms()
    {
        $algos = array(
            // from :
            'arcfour256',
            'arcfour128',

            //'arcfour',      // OPTIONAL          the ARCFOUR stream cipher with a 128-bit key

            // CTR modes from :
            'aes128-ctr',     // RECOMMENDED       AES (Rijndael) in SDCTR mode, with 128-bit key
            'aes192-ctr',     // RECOMMENDED       AES with 192-bit key
            'aes256-ctr',     // RECOMMENDED       AES with 256-bit key

            'twofish128-ctr', // OPTIONAL          Twofish in SDCTR mode, with 128-bit key
            'twofish192-ctr', // OPTIONAL          Twofish with 192-bit key
            'twofish256-ctr', // OPTIONAL          Twofish with 256-bit key

            'aes128-cbc',     // RECOMMENDED       AES with a 128-bit key
            'aes192-cbc',     // OPTIONAL          AES with a 192-bit key
            'aes256-cbc',     // OPTIONAL          AES in CBC mode, with a 256-bit key

            'twofish128-cbc', // OPTIONAL          Twofish with a 128-bit key
            'twofish192-cbc', // OPTIONAL          Twofish with a 192-bit key
            'twofish256-cbc',
            'twofish-cbc',    // OPTIONAL          alias for "twofish256-cbc"
                              //                   (this is being retained for historical reasons)

            'blowfish-ctr',   // OPTIONAL          Blowfish in SDCTR mode

            'blowfish-cbc',   // OPTIONAL          Blowfish in CBC mode

            '3des-ctr',       // RECOMMENDED       Three-key 3DES in SDCTR mode

            '3des-cbc',       // REQUIRED          three-key 3DES in CBC mode

             //'none'           // OPTIONAL          no encryption; NOT RECOMMENDED
        );

        $engines = array(
            CRYPT_ENGINE_OPENSSL,
            CRYPT_ENGINE_MCRYPT,
            CRYPT_ENGINE_INTERNAL
        );

        $ciphers = array();
        foreach ($engines as $engine) {
            foreach ($algos as $algo) {
                $obj = $this->_encryption_algorithm_to_crypt_instance($algo);
                if (strtolower(get_class($obj)) == 'crypt_rijndael') {
                    $obj->setKeyLength(preg_replace('#[^\d]#', '', $algo));
                }
                switch ($algo) {
                    case 'arcfour128':
                    case 'arcfour256':
                        if ($engine == CRYPT_ENGINE_INTERNAL) {
                            $algos = array_diff($algos, array($algo));
                            $ciphers[] = $algo;
                        } else {
                            continue 2;
                        }
                }
                if ($obj->isValidEngine($engine)) {
                    $algos = array_diff($algos, array($algo));
                    $ciphers[] = $algo;
                }
            }
        }

        return $ciphers;
    }

    /**
     * Returns a list of MAC algorithms that phpseclib supports
     *
     * @return array
     * @access public
     */
    function getSupportedMACAlgorithms()
    {
        return array(
            // from :
            'hmac-sha2-256',// RECOMMENDED     HMAC-SHA256 (digest length = key length = 32)

            'hmac-sha1-96', // RECOMMENDED     first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20)
            'hmac-sha1',    // REQUIRED        HMAC-SHA1 (digest length = key length = 20)
            'hmac-md5-96',  // OPTIONAL        first 96 bits of HMAC-MD5 (digest length = 12, key length = 16)
            'hmac-md5',     // OPTIONAL        HMAC-MD5 (digest length = key length = 16)
            //'none'          // OPTIONAL        no MAC; NOT RECOMMENDED
        );
    }

    /**
     * Returns a list of compression algorithms that phpseclib supports
     *
     * @return array
     * @access public
     */
    function getSupportedCompressionAlgorithms()
    {
        return array(
            'none'   // REQUIRED        no compression
            //'zlib' // OPTIONAL        ZLIB (LZ77) compression
        );
    }

    /**
     * Return list of negotiated algorithms
     *
     * Uses the same format as https://www.php.net/ssh2-methods-negotiated
     *
     * @return array
     * @access public
     */
    function getAlgorithmsNegotiated()
    {
        $this->_connect();

        return array(
            'kex' => $this->kex_algorithm,
            'hostkey' => $this->signature_format,
            'client_to_server' => array(
                'crypt' => $this->encrypt->name,
                'mac' => $this->hmac_create->name,
                'comp' => 'none',
            ),
            'server_to_client' => array(
                'crypt' => $this->decrypt->name,
                'mac' => $this->hmac_check->name,
                'comp' => 'none',
            )
        );
    }

    /**
     * Accepts an associative array with up to four parameters as described at
     * 
     *
     * @param array $methods
     * @access public
     */
    function setPreferredAlgorithms($methods)
    {
        $preferred = $methods;

        if (isset($preferred['kex'])) {
            $preferred['kex'] = array_intersect(
                $preferred['kex'],
                $this->getSupportedKEXAlgorithms()
            );
        }

        if (isset($preferred['hostkey'])) {
            $preferred['hostkey'] = array_intersect(
                $preferred['hostkey'],
                $this->getSupportedHostKeyAlgorithms()
            );
        }

        $keys = array('client_to_server', 'server_to_client');
        foreach ($keys as $key) {
            if (isset($preferred[$key])) {
                $a = &$preferred[$key];
                if (isset($a['crypt'])) {
                    $a['crypt'] = array_intersect(
                        $a['crypt'],
                        $this->getSupportedEncryptionAlgorithms()
                    );
                }
                if (isset($a['comp'])) {
                    $a['comp'] = array_intersect(
                        $a['comp'],
                        $this->getSupportedCompressionAlgorithms()
                    );
                }
                if (isset($a['mac'])) {
                    $a['mac'] = array_intersect(
                        $a['mac'],
                        $this->getSupportedMACAlgorithms()
                    );
                }
            }
        }

        $keys = array(
            'kex',
            'hostkey',
            'client_to_server/crypt',
            'client_to_server/comp',
            'client_to_server/mac',
            'server_to_client/crypt',
            'server_to_client/comp',
            'server_to_client/mac',
        );
        foreach ($keys as $key) {
            $p = $preferred;
            $m = $methods;

            $subkeys = explode('/', $key);
            foreach ($subkeys as $subkey) {
                if (!isset($p[$subkey])) {
                    continue 2;
                }
                $p = $p[$subkey];
                $m = $m[$subkey];
            }

            if (count($p) != count($m)) {
                $diff = array_diff($m, $p);
                $msg = count($diff) == 1 ?
                    ' is not a supported algorithm' :
                    ' are not supported algorithms';
                user_error(implode(', ', $diff) . $msg);
                return false;
            }
        }

        $this->preferred = $preferred;
    }

    /**
     * Returns the banner message.
     *
     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
     * authentication may be relevant for getting legal protection."
     *
     * @return string
     * @access public
     */
    function getBannerMessage()
    {
        return $this->banner_message;
    }

    /**
     * Returns the server public host key.
     *
     * Caching this the first time you connect to a server and checking the result on subsequent connections
     * is recommended.  Returns false if the server signature is not signed correctly with the public host key.
     *
     * @return mixed
     * @access public
     */
    function getServerPublicHostKey()
    {
        if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
            if (!$this->_connect()) {
                return false;
            }
        }

        $signature = $this->signature;
        $server_public_host_key = $this->server_public_host_key;

        if (strlen($server_public_host_key) < 4) {
            return false;
        }
        extract(unpack('Nlength', $this->_string_shift($server_public_host_key, 4)));
        $this->_string_shift($server_public_host_key, $length);

        if ($this->signature_validated) {
            return $this->bitmap ?
                $this->signature_format . ' ' . base64_encode($this->server_public_host_key) :
                false;
        }

        $this->signature_validated = true;

        switch ($this->signature_format) {
            case 'ssh-dss':
                $zero = new Math_BigInteger();

                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $p = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);

                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $q = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);

                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $g = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);

                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $y = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);

                /* The value for 'dss_signature_blob' is encoded as a string containing
                   r, followed by s (which are 160-bit integers, without lengths or
                   padding, unsigned, and in network byte order). */
                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
                if ($temp['length'] != 40) {
                    user_error('Invalid signature');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
                }

                $r = new Math_BigInteger($this->_string_shift($signature, 20), 256);
                $s = new Math_BigInteger($this->_string_shift($signature, 20), 256);

                switch (true) {
                    case $r->equals($zero):
                    case $r->compare($q) >= 0:
                    case $s->equals($zero):
                    case $s->compare($q) >= 0:
                        user_error('Invalid signature');
                        return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
                }

                $w = $s->modInverse($q);

                $u1 = $w->multiply(new Math_BigInteger(sha1($this->exchange_hash), 16));
                list(, $u1) = $u1->divide($q);

                $u2 = $w->multiply($r);
                list(, $u2) = $u2->divide($q);

                $g = $g->modPow($u1, $p);
                $y = $y->modPow($u2, $p);

                $v = $g->multiply($y);
                list(, $v) = $v->divide($p);
                list(, $v) = $v->divide($q);

                if (!$v->equals($r)) {
                    user_error('Bad server signature');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
                }

                break;
            case 'ssh-rsa':
            case 'rsa-sha2-256':
            case 'rsa-sha2-512':
                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $e = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);

                if (strlen($server_public_host_key) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
                $rawN = $this->_string_shift($server_public_host_key, $temp['length']);
                $n = new Math_BigInteger($rawN, -256);
                $nLength = strlen(ltrim($rawN, "\0"));

                /*
                if (strlen($signature) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
                $signature = $this->_string_shift($signature, $temp['length']);

                if (!class_exists('Crypt_RSA')) {
                    include_once 'Crypt/RSA.php';
                }

                $rsa = new Crypt_RSA();
                switch ($this->signature_format) {
                    case 'rsa-sha2-512':
                        $hash = 'sha512';
                        break;
                    case 'rsa-sha2-256':
                        $hash = 'sha256';
                        break;
                    //case 'ssh-rsa':
                    default:
                        $hash = 'sha1';
                }
                $rsa->setHash($hash);
                $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
                $rsa->loadKey(array('e' => $e, 'n' => $n), CRYPT_RSA_PUBLIC_FORMAT_RAW);
                if (!$rsa->verify($this->exchange_hash, $signature)) {
                    user_error('Bad server signature');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
                }
                */

                if (strlen($signature) < 4) {
                    return false;
                }
                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
                $s = new Math_BigInteger($this->_string_shift($signature, $temp['length']), 256);

                // validate an RSA signature per "8.2 RSASSA-PKCS1-v1_5", "5.2.2 RSAVP1", and "9.1 EMSA-PSS" in the
                // following URL:
                // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf

                // also, see SSHRSA.c (rsa2_verifysig) in PuTTy's source.

                if ($s->compare(new Math_BigInteger()) < 0 || $s->compare($n->subtract(new Math_BigInteger(1))) > 0) {
                    user_error('Invalid signature');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
                }

                $s = $s->modPow($e, $n);
                $s = $s->toBytes();

                switch ($this->signature_format) {
                    case 'rsa-sha2-512':
                        $hash = 'sha512';
                        break;
                    case 'rsa-sha2-256':
                        $hash = 'sha256';
                        break;
                    //case 'ssh-rsa':
                    default:
                        $hash = 'sha1';
                }
                $hashObj = new Crypt_Hash($hash);
                switch ($this->signature_format) {
                    case 'rsa-sha2-512':
                        $h = pack('N5a*', 0x00305130, 0x0D060960, 0x86480165, 0x03040203, 0x05000440, $hashObj->hash($this->exchange_hash));
                        break;
                    case 'rsa-sha2-256':
                        $h = pack('N5a*', 0x00303130, 0x0D060960, 0x86480165, 0x03040201, 0x05000420, $hashObj->hash($this->exchange_hash));
                        break;
                    //case 'ssh-rsa':
                    default:
                        $hash = 'sha1';
                        $h = pack('N4a*', 0x00302130, 0x0906052B, 0x0E03021A, 0x05000414, $hashObj->hash($this->exchange_hash));
                }
                $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 2 - strlen($h)) . $h;

                if ($s != $h) {
                    user_error('Bad server signature');
                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
                }
                break;
            default:
                user_error('Unsupported signature format');
                return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
        }

        return $this->signature_format . ' ' . base64_encode($this->server_public_host_key);
    }

    /**
     * Returns the exit status of an SSH command or false.
     *
     * @return false|int
     * @access public
     */
    function getExitStatus()
    {
        if (is_null($this->exit_status)) {
            return false;
        }
        return $this->exit_status;
    }

    /**
     * Returns the number of columns for the terminal window size.
     *
     * @return int
     * @access public
     */
    function getWindowColumns()
    {
        return $this->windowColumns;
    }

    /**
     * Returns the number of rows for the terminal window size.
     *
     * @return int
     * @access public
     */
    function getWindowRows()
    {
        return $this->windowRows;
    }

    /**
     * Sets the number of columns for the terminal window size.
     *
     * @param int $value
     * @access public
     */
    function setWindowColumns($value)
    {
        $this->windowColumns = $value;
    }

    /**
     * Sets the number of rows for the terminal window size.
     *
     * @param int $value
     * @access public
     */
    function setWindowRows($value)
    {
        $this->windowRows = $value;
    }

    /**
     * Sets the number of columns and rows for the terminal window size.
     *
     * @param int $columns
     * @param int $rows
     * @access public
     */
    function setWindowSize($columns = 80, $rows = 24)
    {
        $this->windowColumns = $columns;
        $this->windowRows = $rows;
    }
}
phpseclib-1.0.18/phpseclib/System/000077500000000000000000000000001354156543400170215ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/System/SSH/000077500000000000000000000000001354156543400174565ustar00rootroot00000000000000phpseclib-1.0.18/phpseclib/System/SSH/Agent.php000066400000000000000000000366511354156543400212400ustar00rootroot00000000000000
 * login('username', $agent)) {
 *        exit('Login Failed');
 *    }
 *
 *    echo $ssh->exec('pwd');
 *    echo $ssh->exec('ls -la');
 * ?>
 * 
 *
 * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category  System
 * @package   System_SSH_Agent
 * @author    Jim Wigginton 
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 * @internal  See http://api.libssh.org/rfc/PROTOCOL.agent
 */

/**#@+
 * Message numbers
 *
 * @access private
 */
// to request SSH1 keys you have to use SSH_AGENTC_REQUEST_RSA_IDENTITIES (1)
define('SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES', 11);
// this is the SSH2 response; the SSH1 response is SSH_AGENT_RSA_IDENTITIES_ANSWER (2).
define('SYSTEM_SSH_AGENT_IDENTITIES_ANSWER', 12);
define('SYSTEM_SSH_AGENT_FAILURE', 5);
// the SSH1 request is SSH_AGENTC_RSA_CHALLENGE (3)
define('SYSTEM_SSH_AGENTC_SIGN_REQUEST', 13);
// the SSH1 response is SSH_AGENT_RSA_RESPONSE (4)
define('SYSTEM_SSH_AGENT_SIGN_RESPONSE', 14);
/**#@-*/

/**@+
 * Agent forwarding status
 *
 * @access private
 */
// no forwarding requested and not active
define('SYSTEM_SSH_AGENT_FORWARD_NONE', 0);
// request agent forwarding when opportune
define('SYSTEM_SSH_AGENT_FORWARD_REQUEST', 1);
// forwarding has been request and is active
define('SYSTEM_SSH_AGENT_FORWARD_ACTIVE', 2);
/**#@-*/

/**@+
 * Signature Flags
 *
 * See https://tools.ietf.org/html/draft-miller-ssh-agent-00#section-5.3
 *
 * @access private
 */
define('SYSTEM_SSH_AGENT_RSA2_256', 2);
define('SYSTEM_SSH_AGENT_RSA2_512', 4);
/**#@-*/

/**
 * Pure-PHP ssh-agent client identity object
 *
 * Instantiation should only be performed by System_SSH_Agent class.
 * This could be thought of as implementing an interface that Crypt_RSA
 * implements. ie. maybe a Net_SSH_Auth_PublicKey interface or something.
 * The methods in this interface would be getPublicKey, setSignatureMode
 * and sign since those are the methods phpseclib looks for to perform
 * public key authentication.
 *
 * @package System_SSH_Agent
 * @author  Jim Wigginton 
 * @access  internal
 */
class System_SSH_Agent_Identity
{
    /**
     * Key Object
     *
     * @var Crypt_RSA
     * @access private
     * @see self::getPublicKey()
     */
    var $key;

    /**
     * Key Blob
     *
     * @var string
     * @access private
     * @see self::sign()
     */
    var $key_blob;

    /**
     * Socket Resource
     *
     * @var resource
     * @access private
     * @see self::sign()
     */
    var $fsock;

    /**
     * Signature flags
     *
     * @var int
     * @access private
     * @see self::sign()
     * @see self::setHash()
     */
    var $flags = 0;

    /**
     * Default Constructor.
     *
     * @param resource $fsock
     * @return System_SSH_Agent_Identity
     * @access private
     */
    function __construct($fsock)
    {
        $this->fsock = $fsock;
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @param resource $fsock
     * @access public
     */
    function System_SSH_Agent_Identity($fsock)
    {
        $this->__construct($fsock);
    }

    /**
     * Set Public Key
     *
     * Called by System_SSH_Agent::requestIdentities()
     *
     * @param Crypt_RSA $key
     * @access private
     */
    function setPublicKey($key)
    {
        $this->key = $key;
        $this->key->setPublicKey();
    }

    /**
     * Set Public Key
     *
     * Called by System_SSH_Agent::requestIdentities(). The key blob could be extracted from $this->key
     * but this saves a small amount of computation.
     *
     * @param string $key_blob
     * @access private
     */
    function setPublicKeyBlob($key_blob)
    {
        $this->key_blob = $key_blob;
    }

    /**
     * Get Public Key
     *
     * Wrapper for $this->key->getPublicKey()
     *
     * @param int $format optional
     * @return mixed
     * @access public
     */
    function getPublicKey($format = null)
    {
        return !isset($format) ? $this->key->getPublicKey() : $this->key->getPublicKey($format);
    }

    /**
     * Set Signature Mode
     *
     * Doesn't do anything as ssh-agent doesn't let you pick and choose the signature mode. ie.
     * ssh-agent's only supported mode is CRYPT_RSA_SIGNATURE_PKCS1
     *
     * @param int $mode
     * @access public
     */
    function setSignatureMode($mode)
    {
    }

    /**
     * Set Hash
     *
     * ssh-agent doesn't support using hashes for RSA other than SHA1
     *
     * @param string $hash
     * @access public
     */
    function setHash($hash)
    {
        $this->flags = 0;
        switch ($hash) {
            case 'sha1':
                break;
            case 'sha256':
                $this->flags = SYSTEM_SSH_AGENT_RSA2_256;
                break;
            case 'sha512':
                $this->flags = SYSTEM_SSH_AGENT_RSA2_512;
                break;
            default:
                user_error('The only supported hashes for RSA are sha1, sha256 and sha512');
        }
    }

    /**
     * Create a signature
     *
     * See "2.6.2 Protocol 2 private key signature request"
     *
     * @param string $message
     * @return string
     * @access public
     */
    function sign($message)
    {
        // the last parameter (currently 0) is for flags and ssh-agent only defines one flag (for ssh-dss): SSH_AGENT_OLD_SIGNATURE
        $packet = pack('CNa*Na*N', SYSTEM_SSH_AGENTC_SIGN_REQUEST, strlen($this->key_blob), $this->key_blob, strlen($message), $message, $this->flags);
        $packet = pack('Na*', strlen($packet), $packet);
        if (strlen($packet) != fputs($this->fsock, $packet)) {
            user_error('Connection closed during signing');
        }

        $length = current(unpack('N', fread($this->fsock, 4)));
        $type = ord(fread($this->fsock, 1));
        if ($type != SYSTEM_SSH_AGENT_SIGN_RESPONSE) {
            user_error('Unable to retreive signature');
        }

        $signature_blob = fread($this->fsock, $length - 1);
        $length = current(unpack('N', $this->_string_shift($signature_blob, 4)));
        if ($length != strlen($signature_blob)) {
            user_error('Malformed signature blob');
        }
        $length = current(unpack('N', $this->_string_shift($signature_blob, 4)));
        if ($length > strlen($signature_blob) + 4) {
            user_error('Malformed signature blob');
        }
        $type = $this->_string_shift($signature_blob, $length);
        $this->_string_shift($signature_blob, 4);

        return $signature_blob;
    }

    /**
     * String Shift
     *
     * Inspired by array_shift
     *
     * @param string $string
     * @param int $index
     * @return string
     * @access private
     */
    function _string_shift(&$string, $index = 1)
    {
        $substr = substr($string, 0, $index);
        $string = substr($string, $index);
        return $substr;
    }
}

/**
 * Pure-PHP ssh-agent client identity factory
 *
 * requestIdentities() method pumps out System_SSH_Agent_Identity objects
 *
 * @package System_SSH_Agent
 * @author  Jim Wigginton 
 * @access  public
 */
class System_SSH_Agent
{
    /**
     * Socket Resource
     *
     * @var resource
     * @access private
     */
    var $fsock;

    /**
     * Agent forwarding status
     *
     * @access private
     */
    var $forward_status = SYSTEM_SSH_AGENT_FORWARD_NONE;

    /**
     * Buffer for accumulating forwarded authentication
     * agent data arriving on SSH data channel destined
     * for agent unix socket
     *
     * @access private
     */
    var $socket_buffer = '';

    /**
     * Tracking the number of bytes we are expecting
     * to arrive for the agent socket on the SSH data
     * channel
     */
    var $expected_bytes = 0;

    /**
     * Default Constructor
     *
     * @return System_SSH_Agent
     * @access public
     */
    function __construct($address = null)
    {
        if (!$address) {
            switch (true) {
                case isset($_SERVER['SSH_AUTH_SOCK']):
                    $address = $_SERVER['SSH_AUTH_SOCK'];
                    break;
                case isset($_ENV['SSH_AUTH_SOCK']):
                    $address = $_ENV['SSH_AUTH_SOCK'];
                    break;
                default:
                    user_error('SSH_AUTH_SOCK not found');
                    return false;
            }
        }

        $this->fsock = fsockopen('unix://' . $address, 0, $errno, $errstr);
        if (!$this->fsock) {
            user_error("Unable to connect to ssh-agent (Error $errno: $errstr)");
        }
    }

    /**
     * PHP4 compatible Default Constructor.
     *
     * @see self::__construct()
     * @access public
     */
    function System_SSH_Agent($address = null)
    {
        $this->__construct($address);
    }

    /**
     * Request Identities
     *
     * See "2.5.2 Requesting a list of protocol 2 keys"
     * Returns an array containing zero or more System_SSH_Agent_Identity objects
     *
     * @return array
     * @access public
     */
    function requestIdentities()
    {
        if (!$this->fsock) {
            return array();
        }

        $packet = pack('NC', 1, SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES);
        if (strlen($packet) != fputs($this->fsock, $packet)) {
            user_error('Connection closed while requesting identities');
            return array();
        }

        $length = current(unpack('N', fread($this->fsock, 4)));
        $type = ord(fread($this->fsock, 1));
        if ($type != SYSTEM_SSH_AGENT_IDENTITIES_ANSWER) {
            user_error('Unable to request identities');
            return array();
        }

        $identities = array();
        $keyCount = current(unpack('N', fread($this->fsock, 4)));
        for ($i = 0; $i < $keyCount; $i++) {
            $length = current(unpack('N', fread($this->fsock, 4)));
            $key_blob = fread($this->fsock, $length);
            $key_str = 'ssh-rsa ' . base64_encode($key_blob);
            $length = current(unpack('N', fread($this->fsock, 4)));
            if ($length) {
                $key_str.= ' ' . fread($this->fsock, $length);
            }
            $length = current(unpack('N', substr($key_blob, 0, 4)));
            $key_type = substr($key_blob, 4, $length);
            switch ($key_type) {
                case 'ssh-rsa':
                    if (!class_exists('Crypt_RSA')) {
                        include_once 'Crypt/RSA.php';
                    }
                    $key = new Crypt_RSA();
                    $key->loadKey($key_str);
                    break;
                case 'ssh-dss':
                    // not currently supported
                    break;
            }
            // resources are passed by reference by default
            if (isset($key)) {
                $identity = new System_SSH_Agent_Identity($this->fsock);
                $identity->setPublicKey($key);
                $identity->setPublicKeyBlob($key_blob);
                $identities[] = $identity;
                unset($key);
            }
        }

        return $identities;
    }

    /**
     * Signal that agent forwarding should
     * be requested when a channel is opened
     *
     * @param Net_SSH2 $ssh
     * @return bool
     * @access public
     */
    function startSSHForwarding($ssh)
    {
        if ($this->forward_status == SYSTEM_SSH_AGENT_FORWARD_NONE) {
            $this->forward_status = SYSTEM_SSH_AGENT_FORWARD_REQUEST;
        }
    }

    /**
     * Request agent forwarding of remote server
     *
     * @param Net_SSH2 $ssh
     * @return bool
     * @access private
     */
    function _request_forwarding($ssh)
    {
        $request_channel = $ssh->_get_open_channel();
        if ($request_channel === false) {
            return false;
        }

        $packet = pack(
            'CNNa*C',
            NET_SSH2_MSG_CHANNEL_REQUEST,
            $ssh->server_channels[$request_channel],
            strlen('auth-agent-req@openssh.com'),
            'auth-agent-req@openssh.com',
            1
        );

        $ssh->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_REQUEST;

        if (!$ssh->_send_binary_packet($packet)) {
            return false;
        }

        $response = $ssh->_get_channel_packet($request_channel);
        if ($response === false) {
            return false;
        }

        $ssh->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_OPEN;
        $this->forward_status = SYSTEM_SSH_AGENT_FORWARD_ACTIVE;

        return true;
    }

    /**
     * On successful channel open
     *
     * This method is called upon successful channel
     * open to give the SSH Agent an opportunity
     * to take further action. i.e. request agent forwarding
     *
     * @param Net_SSH2 $ssh
     * @access private
     */
    function _on_channel_open($ssh)
    {
        if ($this->forward_status == SYSTEM_SSH_AGENT_FORWARD_REQUEST) {
            $this->_request_forwarding($ssh);
        }
    }

    /**
     * Forward data to SSH Agent and return data reply
     *
     * @param string $data
     * @return data from SSH Agent
     * @access private
     */
    function _forward_data($data)
    {
        if ($this->expected_bytes > 0) {
            $this->socket_buffer.= $data;
            $this->expected_bytes -= strlen($data);
        } else {
            $agent_data_bytes = current(unpack('N', $data));
            $current_data_bytes = strlen($data);
            $this->socket_buffer = $data;
            if ($current_data_bytes != $agent_data_bytes + 4) {
                $this->expected_bytes = ($agent_data_bytes + 4) - $current_data_bytes;
                return false;
            }
        }

        if (strlen($this->socket_buffer) != fwrite($this->fsock, $this->socket_buffer)) {
            user_error('Connection closed attempting to forward data to SSH agent');
        }

        $this->socket_buffer = '';
        $this->expected_bytes = 0;

        $agent_reply_bytes = current(unpack('N', fread($this->fsock, 4)));

        $agent_reply_data = fread($this->fsock, $agent_reply_bytes);
        $agent_reply_data = current(unpack('a*', $agent_reply_data));

        return pack('Na*', $agent_reply_bytes, $agent_reply_data);
    }
}
phpseclib-1.0.18/phpseclib/System/SSH_Agent.php000066400000000000000000000034441354156543400213120ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 * @internal  See http://api.libssh.org/rfc/PROTOCOL.agent
 */

require_once 'SSH/Agent.php';
phpseclib-1.0.18/phpseclib/bootstrap.php000066400000000000000000000006601354156543400202650ustar00rootroot00000000000000


    
        
            ./tests/Unit/
        
        
            ./tests/Functional/
        
    

    
    
        
            ./phpseclib/
        
    

phpseclib-1.0.18/tests/000077500000000000000000000000001354156543400147265ustar00rootroot00000000000000phpseclib-1.0.18/tests/Functional/000077500000000000000000000000001354156543400170305ustar00rootroot00000000000000phpseclib-1.0.18/tests/Functional/Net/000077500000000000000000000000001354156543400175565ustar00rootroot00000000000000phpseclib-1.0.18/tests/Functional/Net/SCPSSH2UserStoryTest.php000066400000000000000000000055061354156543400241220ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Functional_Net_SCPSSH2UserStoryTest extends PhpseclibFunctionalTestCase
{
    static protected $remoteFile;
    static protected $exampleData;
    static protected $exampleDataLength;

    public static function setUpBeforeClass()
    {
        parent::setUpBeforeClass();
        self::$remoteFile = uniqid('phpseclib-scp-ssh2-') . '.txt';
        self::$exampleData = str_repeat('abscp12345', 1000);
        self::$exampleDataLength = 10000;
    }

    public function testConstructSSH2()
    {
        $ssh = new Net_SSH2($this->getEnv('SSH_HOSTNAME'));
        $this->assertTrue(
            $ssh->login(
                $this->getEnv('SSH_USERNAME'),
                $this->getEnv('SSH_PASSWORD')
            )
        );
        return $ssh;
    }

    /** @depends testConstructSSH2 */
    public function testConstructor($ssh)
    {
        $scp = new Net_SCP($ssh);
        $this->assertTrue(
            is_object($scp),
            'Could not construct Net_SCP object.'
        );
        return $scp;
    }

    /** @depends testConstructor */
    public function testPutGetString($scp)
    {
        $this->assertTrue(
            $scp->put(self::$remoteFile, self::$exampleData),
            'Failed asserting that data could successfully be put() into file.'
        );
        $content = $scp->get(self::$remoteFile);
        // TODO: Address https://github.com/phpseclib/phpseclib/issues/146
        $this->assertContains(
            strlen($content),
            array(self::$exampleDataLength, self::$exampleDataLength + 1),
            'Failed asserting that string length matches expected length.'
        );
        $this->assertContains(
            $content,
            array(self::$exampleData, self::$exampleData . "\0"),
            'Failed asserting that string content matches expected content.'
        );
        return $scp;
    }

    /** @depends testPutGetString */
    public function testGetFile($scp)
    {
        $localFilename = $this->createTempFile();
        $this->assertTrue(
            $scp->get(self::$remoteFile, $localFilename),
            'Failed asserting that get() into file was successful.'
        );
        // TODO: Address https://github.com/phpseclib/phpseclib/issues/146
        $this->assertContains(
            filesize($localFilename),
            array(self::$exampleDataLength, self::$exampleDataLength + 1),
            'Failed asserting that filesize matches expected data size.'
        );
        $this->assertContains(
            file_get_contents($localFilename),
            array(self::$exampleData, self::$exampleData . "\0"),
            'Failed asserting that file content matches expected content.'
        );
    }
}
phpseclib-1.0.18/tests/Functional/Net/SFTPLargeFileTest.php000066400000000000000000000022651354156543400234630ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/Base.php';

class Functional_Net_SFTPLargeFileTest extends Functional_Net_SFTPTestCase
{
    public static function setUpBeforeClass()
    {
        if (!extension_loaded('mcrypt') && !extension_loaded('openssl')) {
            self::markTestSkipped('This test depends on mcrypt or openssl for performance.');
        }
        parent::setUpBeforeClass();
    }

    /**
     * @group github298
     * @group github455
     * @group github457
     */
    public function testPutSizeLocalFile()
    {
        $tmp_filename = $this->createTempFile(128, 1024 * 1024);
        $filename = 'file-large-from-local.txt';

        $this->assertTrue(
            $this->sftp->put($filename, $tmp_filename, NET_SFTP_LOCAL_FILE),
            'Failed asserting that local file could be successfully put().'
        );

        $this->assertSame(
            128 * 1024 * 1024,
            $this->sftp->size($filename),
            'Failed asserting that uploaded local file has the expected length.'
        );
    }
}
phpseclib-1.0.18/tests/Functional/Net/SFTPStreamTest.php000066400000000000000000000024161354156543400230620ustar00rootroot00000000000000
 * @copyright 2015 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

// Registers sftp:// as a side effect.
require_once 'Net/SFTP/Stream.php';

class Functional_Net_SFTPStreamTest extends Functional_Net_SFTPTestCase
{
    public function testFopenFcloseCreatesFile()
    {
        $context = stream_context_create(array(
            'sftp' => array('session' => $this->sftp),
        ));
        $fp = fopen($this->buildUrl('fooo.txt'), 'wb', false, $context);
        $this->assertTrue(is_resource($fp));
        fclose($fp);
        $this->assertSame(0, $this->sftp->size('fooo.txt'));
    }

    /**
     * @group github778
     */
    public function testFilenameWithHash()
    {
        $context = stream_context_create(array(
            'sftp' => array('session' => $this->sftp),
        ));
        $fp = fopen($this->buildUrl('te#st.txt'), 'wb', false, $context);
        fputs($fp, 'zzzz');
        fclose($fp);

        $this->assertTrue(in_array('te#st.txt', $this->sftp->nlist()));
    }

    protected function buildUrl($suffix)
    {
        return sprintf(
            'sftp://via-context/%s/%s',
            $this->sftp->pwd(),
            $suffix
        );
    }
}
phpseclib-1.0.18/tests/Functional/Net/SFTPTestCase.php000066400000000000000000000021011354156543400224710ustar00rootroot00000000000000
 * @copyright 2015 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

/**
 * This class provides each test method with a new and empty $this->scratchDir.
 */
abstract class Functional_Net_SFTPTestCase extends PhpseclibFunctionalTestCase
{
    protected $sftp;
    protected $scratchDir;

    public function setUp()
    {
        parent::setUp();
        $this->scratchDir = uniqid('phpseclib-sftp-scratch-');

        $this->sftp = new Net_SFTP($this->getEnv('SSH_HOSTNAME'));
        $this->assertTrue($this->sftp->login(
            $this->getEnv('SSH_USERNAME'),
            $this->getEnv('SSH_PASSWORD')
        ));
        $this->assertTrue($this->sftp->mkdir($this->scratchDir));
        $this->assertTrue($this->sftp->chdir($this->scratchDir));
    }

    public function tearDown()
    {
        if ($this->sftp) {
            $this->sftp->chdir($this->getEnv('SSH_HOME'));
            $this->sftp->delete($this->scratchDir);
        }
        parent::tearDown();
    }
}
phpseclib-1.0.18/tests/Functional/Net/SFTPUserStoryTest.php000066400000000000000000000476711354156543400236220ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
{
    static protected $scratchDir;
    static protected $exampleData;
    static protected $exampleDataLength;
    static protected $buffer;

    public static function setUpBeforeClass()
    {
        parent::setUpBeforeClass();

        self::$scratchDir = uniqid('phpseclib-sftp-scratch-');

        self::$exampleData = str_repeat('abcde12345', 1000);
        self::$exampleDataLength = 10000;
    }

    public function testConstructor()
    {
        $sftp = new Net_SFTP($this->getEnv('SSH_HOSTNAME'));

        $this->assertTrue(
            is_object($sftp),
            'Could not construct NET_SFTP object.'
        );

        return $sftp;
    }

    /**
     * @depends testConstructor
     */
    public function testPasswordLogin($sftp)
    {
        $username = $this->getEnv('SSH_USERNAME');
        $password = $this->getEnv('SSH_PASSWORD');
        $this->assertTrue(
            $sftp->login($username, $password),
            'SSH2/SFTP login using password failed.'
        );

        return $sftp;
    }

    /**
     * @depends testPasswordLogin
     */
    public function testPwdHome($sftp)
    {
        $this->assertEquals(
            $this->getEnv('SSH_HOME'),
            $sftp->pwd(),
            'Failed asserting that pwd() returns home directory after login.'
        );

        return $sftp;
    }

    /**
     * @depends testPwdHome
     */
    public function testMkDirScratch($sftp)
    {
        $dirname = self::$scratchDir;

        $this->assertTrue(
            $sftp->mkdir($dirname),
            "Failed asserting that a new scratch directory $dirname could " .
            'be created.'
        );

        $this->assertFalse(
            $sftp->mkdir($dirname),
            "Failed asserting that a new scratch directory $dirname could " .
            'not be created (because it already exists).'
        );

        return $sftp;
    }

    /**
     * @depends testMkDirScratch
     */
    public function testChDirScratch($sftp)
    {
        $this->assertTrue(
            $sftp->chdir(self::$scratchDir),
            sprintf(
                'Failed asserting that working directory could be changed ' .
                'to scratch directory %s.',
                self::$scratchDir
            )
        );

        $pwd = $sftp->pwd();

        $this->assertStringStartsWith(
            $this->getEnv('SSH_HOME'),
            $pwd,
            'Failed asserting that the home directory is a prefix of the ' .
            'current working directory.'
        );

        $this->assertStringEndsWith(
            self::$scratchDir,
            $pwd,
            'Failed asserting that the scratch directory name is a suffix ' .
            'of the current working directory.'
        );

        return $sftp;
    }

    /**
     * @depends testChDirScratch
     */
    public function testStatOnDir($sftp)
    {
        $this->assertNotSame(
            array(),
            $sftp->stat('.'),
            'Failed asserting that the cwd has a non-empty stat.'
        );

        return $sftp;
    }

    static function callback($length)
    {
        $r = substr(self::$buffer, 0, $length);
        self::$buffer = substr(self::$buffer, $length);
        if (strlen($r)) {
            return $r;
        }
        return null;
    }

    /**
     * @depends testStatOnDir
     */
    public function testPutSizeGetFileCallback($sftp)
    {
        self::$buffer =  self::$exampleData;
        $this->assertTrue(
            $sftp->put('file1.txt', array(__CLASS__, 'callback'), NET_SFTP_CALLBACK),
            'Failed asserting that example data could be successfully put().'
        );

        $this->assertSame(
            self::$exampleDataLength,
            $sftp->size('file1.txt'),
            'Failed asserting that put example data has the expected length'
        );

        $this->assertSame(
            self::$exampleData,
            $sftp->get('file1.txt'),
            'Failed asserting that get() returns expected example data.'
        );

        return $sftp;
    }

    /**
     * @depends testStatOnDir
     */
    public function testPutSizeGetFile($sftp)
    {
        $this->assertTrue(
            $sftp->put('file1.txt', self::$exampleData),
            'Failed asserting that example data could be successfully put().'
        );

        $this->assertSame(
            self::$exampleDataLength,
            $sftp->size('file1.txt'),
            'Failed asserting that put example data has the expected length'
        );

        $this->assertSame(
            self::$exampleData,
            $sftp->get('file1.txt'),
            'Failed asserting that get() returns expected example data.'
        );

        return $sftp;
    }

    /**
     * @depends testPutSizeGetFile
     */
    public function testTouch($sftp)
    {
        $this->assertTrue(
            $sftp->touch('file2.txt'),
            'Failed asserting that touch() successfully ran.'
        );

        $this->assertTrue(
            $sftp->file_exists('file2.txt'),
            'Failed asserting that touch()\'d file exists'
        );

        return $sftp;
    }

    /**
     * @depends testTouch
     */
    public function testTruncate($sftp)
    {
        $this->assertTrue(
            $sftp->touch('file3.txt'),
            'Failed asserting that touch() successfully ran.'
        );

        $this->assertTrue(
            $sftp->truncate('file3.txt', 1024 * 1024),
            'Failed asserting that touch() successfully ran.'
        );

        $this->assertSame(
            1024 * 1024,
            $sftp->size('file3.txt'),
            'Failed asserting that truncate()\'d file has the expected length'
        );

        return $sftp;
    }

    /**
     * @depends testTruncate
     * @group github850
     */
    public function testChModOnFile($sftp)
    {
        $this->assertNotFalse(
            $sftp->chmod(0755, 'file1.txt'),
            'Failed asserting that chmod() was successful.'
        );

        return $sftp;
    }

    /**
     * @depends testChModOnFile
     */
    public function testChDirOnFile($sftp)
    {
        $this->assertFalse(
            $sftp->chdir('file1.txt'),
            'Failed to assert that the cwd cannot be changed to a file'
        );

        return $sftp;
    }

    /**
     * @depends testChDirOnFile
     */
    public function testFileExistsIsFileIsDirFile($sftp)
    {
        $this->assertTrue(
            $sftp->file_exists('file1.txt'),
            'Failed asserting that file_exists() on example file returns true.'
        );

        $this->assertTrue(
            $sftp->is_file('file1.txt'),
            'Failed asserting that is_file() on example file returns true.'
        );

        $this->assertFalse(
            $sftp->is_dir('file1.txt'),
            'Failed asserting that is_dir() on example file returns false.'
        );

        return $sftp;
    }

    /**
     * @depends testFileExistsIsFileIsDirFile
     */
    public function testFileExistsIsFileIsDirFileNonexistent($sftp)
    {
        $this->assertFalse(
            $sftp->file_exists('file4.txt'),
            'Failed asserting that a nonexistent file does not exist.'
        );

        $this->assertFalse(
            $sftp->is_file('file4.txt'),
            'Failed asserting that is_file() on nonexistent file returns false.'
        );

        $this->assertFalse(
            $sftp->is_dir('file4.txt'),
            'Failed asserting that is_dir() on nonexistent file returns false.'
        );

        return $sftp;
    }

    /**
     * @depends testFileExistsIsFileIsDirFileNonexistent
     */
    public function testSortOrder($sftp)
    {
        $this->assertTrue(
            $sftp->mkdir('temp'),
            "Failed asserting that a new scratch directory temp could " .
            'be created.'
        );

        $sftp->setListOrder('filename', SORT_DESC);

        $list = $sftp->nlist();
        $expected = array('.', '..', 'temp', 'file3.txt', 'file2.txt', 'file1.txt');

        $this->assertSame(
            $list,
            $expected,
            'Failed asserting that list sorted correctly.'
        );

        $sftp->setListOrder('filename', SORT_ASC);

        $list = $sftp->nlist();
        $expected = array('.', '..', 'temp', 'file1.txt', 'file2.txt', 'file3.txt');

        $this->assertSame(
            $list,
            $expected,
            'Failed asserting that list sorted correctly.'
        );

        $sftp->setListOrder('size', SORT_DESC);

        $files = $sftp->nlist();

        $last_size = 0x7FFFFFFF;
        foreach ($files as $file) {
            if ($sftp->is_file($file)) {
                $cur_size = $sftp->size($file);
                $this->assertLessThanOrEqual(
                    $last_size,
                    $cur_size,
                    'Failed asserting that nlist() is in descending order'
                );
                $last_size = $cur_size;
            }
        }

        return $sftp;
    }

    /**
     * @depends testSortOrder
     */
    public function testResourceXfer($sftp)
    {
        $fp = fopen('res.txt', 'w+');
        $sftp->get('file1.txt', $fp);
        rewind($fp);
        $sftp->put('file4.txt', $fp);
        fclose($fp);

        $this->assertSame(
            self::$exampleData,
            $sftp->get('file4.txt'),
            'Failed asserting that a file downloaded into a resource and reuploaded from a resource has the correct data'
        );

        return $sftp;
    }

    /**
     * @depends testResourceXfer
     */
    public function testSymlink($sftp)
    {
        $this->assertTrue(
            $sftp->symlink('file3.txt', 'symlink'),
            'Failed asserting that a symlink could be created'
        );

        return $sftp;
    }

    /**
     * @depends testSymlink
     */
    public function testStatLstatCache($sftp)
    {
        $stat = $sftp->stat('symlink');
        $lstat = $sftp->lstat('symlink');
        $this->assertNotEquals(
            $stat,
            $lstat,
            'Failed asserting that stat and lstat returned different output for a symlink'
        );

        return $sftp;
    }

    /**
     * @depends testStatLstatCache
     */
    public function testLinkFile($sftp)
    {
        $this->assertTrue(
            $sftp->is_link('symlink'),
            'Failed asserting that symlink is a link'
        );
        $this->assertTrue(
            $sftp->is_file('symlink'),
            'Failed asserting that symlink is a file'
        );
        $this->assertFalse(
            $sftp->is_dir('symlink'),
            'Failed asserting that symlink is not a directory'
        );

        return $sftp;
    }

    /**
     * @depends testLinkFile
     */
    public function testReadlink($sftp)
    {
        $this->assertInternalType(
            'string',
            $sftp->readlink('symlink'),
            'Failed asserting that a symlink\'s target could be read'
        );

        return $sftp;
    }

    /**
     * @depends testReadlink
     * @group github716
     */
    public function testStatOnCWD($sftp)
    {
        $stat = $sftp->stat('.');
        $this->assertInternalType(
            'array',
            $stat,
            'Failed asserting that stat on . returns an array'
        );
        $lstat = $sftp->lstat('.');
        $this->assertInternalType(
            'array',
            $lstat,
            'Failed asserting that lstat on . returns an array'
        );

        return $sftp;
    }

    /**
     * on older versions this would result in a fatal error
     * @depends testStatOnCWD
     * @group github402
     */
    public function testStatcacheFix($sftp)
    {
        // Name used for both directory and file.
        $name = 'stattestdir';
        $this->assertTrue($sftp->mkdir($name));
        $this->assertTrue($sftp->is_dir($name));
        $this->assertTrue($sftp->chdir($name));
        $this->assertStringEndsWith(self::$scratchDir . '/' . $name, $sftp->pwd());
        $this->assertFalse($sftp->file_exists($name));
        $this->assertTrue($sftp->touch($name));
        $this->assertTrue($sftp->is_file($name));
        $this->assertTrue($sftp->chdir('..'));
        $this->assertStringEndsWith(self::$scratchDir, $sftp->pwd());
        $this->assertTrue($sftp->is_dir($name));
        $this->assertTrue($sftp->is_file("$name/$name"));
        $this->assertTrue($sftp->delete($name, true));

        return $sftp;
    }

    /**
     * @depends testStatcacheFix
     */
    public function testChDirUpHome($sftp)
    {
        $this->assertTrue(
            $sftp->chdir('../'),
            'Failed asserting that directory could be changed one level up.'
        );

        $this->assertEquals(
            $this->getEnv('SSH_HOME'),
            $sftp->pwd(),
            'Failed asserting that pwd() returns home directory.'
        );

        return $sftp;
    }

    /**
     * @depends testChDirUpHome
     */
    public function testFileExistsIsFileIsDirDir($sftp)
    {
        $this->assertTrue(
            $sftp->file_exists(self::$scratchDir),
            'Failed asserting that file_exists() on scratch dir returns true.'
        );

        $this->assertFalse(
            $sftp->is_file(self::$scratchDir),
            'Failed asserting that is_file() on example file returns false.'
        );

        $this->assertTrue(
            $sftp->is_dir(self::$scratchDir),
            'Failed asserting that is_dir() on example file returns true.'
        );

        return $sftp;
    }

    /**
     * @depends testFileExistsIsFileIsDirDir
     */
    public function testTruncateLargeFile($sftp)
    {
        $filesize = (4 * 1024 + 16) * 1024 * 1024;
        $filename = 'file-large-from-truncate-4112MiB.txt';
        $this->assertTrue($sftp->touch($filename));
        $this->assertTrue($sftp->truncate($filename, $filesize));
        $this->assertSame($filesize, $sftp->size($filename));

        return $sftp;
    }

    /**
     * @depends testTruncateLargeFile
     */
    public function testRmDirScratch($sftp)
    {
        $this->assertFalse(
            $sftp->rmdir(self::$scratchDir),
            'Failed asserting that non-empty scratch directory could ' .
            'not be deleted using rmdir().'
        );

        return $sftp;
    }

    /**
     * @depends testRmDirScratch
     */
    public function testDeleteRecursiveScratch($sftp)
    {
        $this->assertTrue(
            $sftp->delete(self::$scratchDir),
            'Failed asserting that non-empty scratch directory could ' .
            'be deleted using recursive delete().'
        );

        return $sftp;
    }

    /**
     * @depends testDeleteRecursiveScratch
     */
    public function testRmDirScratchNonexistent($sftp)
    {
        $this->assertFalse(
            $sftp->rmdir(self::$scratchDir),
            'Failed asserting that nonexistent scratch directory could ' .
            'not be deleted using rmdir().'
        );

        return $sftp;
    }

    /**
     * @depends testRmDirScratchNonexistent
     * @group github706
     */
    public function testDeleteEmptyDir($sftp)
    {
        $this->assertTrue(
            $sftp->mkdir(self::$scratchDir),
            'Failed asserting that scratch directory could ' .
            'be created.'
        );
        $this->assertInternalType(
            'array',
            $sftp->stat(self::$scratchDir),
            'Failed asserting that stat on an existant empty directory returns an array'
        );
        $this->assertTrue(
            $sftp->delete(self::$scratchDir),
            'Failed asserting that empty scratch directory could ' .
            'be deleted using recursive delete().'
        );
        $this->assertFalse(
            $sftp->stat(self::$scratchDir),
            'Failed asserting that stat on a deleted directory returns false'
        );

        return $sftp;
    }

    /**
     * @depends testDeleteEmptyDir
     * @group github735
     */
    public function testStatVsLstat($sftp)
    {
        $this->assertTrue($sftp->mkdir(self::$scratchDir));
        $this->assertTrue($sftp->chdir(self::$scratchDir));
        $this->assertTrue($sftp->put('text.txt', 'zzzzz'));
        $this->assertTrue($sftp->symlink('text.txt', 'link.txt'));
        $this->assertTrue($sftp->mkdir('subdir'));
        $this->assertTrue($sftp->symlink('subdir', 'linkdir'));

        $sftp->clearStatCache();

        // pre-populate the stat cache
        $sftp->nlist();

        $stat = $sftp->stat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_REGULAR);
        $stat = $sftp->lstat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_SYMLINK);

        $stat = $sftp->stat('linkdir');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_DIRECTORY);
        $stat = $sftp->lstat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_SYMLINK);

        $sftp->disableStatCache();

        $sftp->nlist();

        $stat = $sftp->stat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_REGULAR);
        $stat = $sftp->lstat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_SYMLINK);

        $stat = $sftp->stat('linkdir');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_DIRECTORY);
        $stat = $sftp->lstat('link.txt');
        $this->assertSame($stat['type'], NET_SFTP_TYPE_SYMLINK);

        $sftp->enableStatCache();

        return $sftp;
    }

    /**
     * @depends testStatVsLstat
     * @group github830
     */
    public function testUploadOffsets($sftp)
    {
        $sftp->put('offset.txt', 'res.txt', NET_SFTP_LOCAL_FILE, 0, 10);
        $this->assertSame(
            substr(self::$exampleData, 10),
            $sftp->get('offset.txt'),
            'Failed asserting that portions of a file could be uploaded.'
        );

        $sftp->put('offset.txt', 'res.txt', NET_SFTP_LOCAL_FILE, self::$exampleDataLength - 100);
        $this->assertSame(
            substr(self::$exampleData, 10, -90) . self::$exampleData,
            $sftp->get('offset.txt'),
            'Failed asserting that you could upload into the middle of a file.'
        );

        return $sftp;
    }

    /**
     * @depends testUploadOffsets
     */
    public function testReadableWritable($sftp)
    {
        $sftp->chmod(0000, 'offset.txt');
        $this->assertFalse($sftp->is_writable('offset.txt'));
        $this->assertFalse($sftp->is_writeable('offset.txt'));
        $this->assertFalse($sftp->is_readable('offset.txt'));

        $sftp->chmod(0777, 'offset.txt');
        $this->assertTrue($sftp->is_writable('offset.txt'));
        $this->assertTrue($sftp->is_writeable('offset.txt'));
        $this->assertTrue($sftp->is_readable('offset.txt'));

        $this->assertFalse($sftp->is_writable('nonexistantfile.ext'));
        $this->assertFalse($sftp->is_writeable('nonexistantfile.ext'));
        $this->assertFalse($sftp->is_readable('nonexistantfile.ext'));

        return $sftp;
    }

    /**
     * @depends testReadableWritable
     * @group github999
     */
    public function testExecNlist($sftp)
    {
        $sftp->enablePTY();
        $sftp->exec('ping google.com -c 5');
        sleep(5);
        $sftp->nlist();

        return $sftp;
    }

    /**
     * @depends testExecNlist
     */
    public function testRawlistDisabledStatCache($sftp)
    {
        $this->assertTrue($sftp->mkdir(self::$scratchDir));
        $this->assertTrue($sftp->chdir(self::$scratchDir));
        $this->assertTrue($sftp->put('text.txt', 'zzzzz'));
        $this->assertTrue($sftp->mkdir('subdir'));
        $this->assertTrue($sftp->chdir('subdir'));
        $this->assertTrue($sftp->put('leaf.txt', 'yyyyy'));
        $this->assertTrue($sftp->chdir('../../'));

        $list_cache_enabled = $sftp->rawlist('.', true);

        $sftp->clearStatCache();

        $sftp->disableStatCache();

        $list_cache_disabled = $sftp->rawlist('.', true);

        $this->assertEquals($list_cache_enabled, $list_cache_disabled, 'The files should be the same regardless of stat cache', 0.0, 10, true);
    }
}
phpseclib-1.0.18/tests/Functional/Net/SSH2AgentTest.php000066400000000000000000000026061354156543400226310ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Functional_Net_SSH2AgentTest extends PhpseclibFunctionalTestCase
{
    public static function setUpBeforeClass()
    {
        if (!isset($_SERVER['SSH_AUTH_SOCK'])) {
            self::markTestSkipped(
                'This test requires an SSH Agent (SSH_AUTH_SOCK env variable).'
            );
        }
        parent::setUpBeforeClass();
    }

    public function testAgentLogin()
    {
        $ssh = new Net_SSH2($this->getEnv('SSH_HOSTNAME'));
        $agent = new System_SSH_Agent;

        $this->assertTrue(
            $ssh->login($this->getEnv('SSH_USERNAME'), $agent),
            'SSH2 login using Agent failed.'
        );

        return array('ssh' => $ssh, 'ssh-agent' => $agent);
    }

    /**
     * @depends testAgentLogin
     */
    public function testAgentForward($args)
    {
        $ssh = $args['ssh'];
        $agent = $args['ssh-agent'];

        $hostname = $this->getEnv('SSH_HOSTNAME');
        $username = $this->getEnv('SSH_USERNAME');

        $this->assertEquals($username, trim($ssh->exec('whoami')));

        $agent->startSSHForwarding($ssh);
        $this->assertEquals($username, trim($ssh->exec("ssh " . $username . "@" . $hostname . ' \'whoami\'')));

        return $args;
    }
}
phpseclib-1.0.18/tests/Functional/Net/SSH2Test.php000066400000000000000000000104351354156543400216510ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Functional_Net_SSH2Test extends PhpseclibFunctionalTestCase
{
    public function testConstructor()
    {
        $ssh = new Net_SSH2($this->getEnv('SSH_HOSTNAME'));

        $this->assertTrue(
            is_object($ssh),
            'Could not construct NET_SSH2 object.'
        );

        return $ssh;
    }

    /**
     * @depends testConstructor
     * @group github408
     * @group github412
     */
    public function testPreLogin($ssh)
    {
        $this->assertFalse(
            $ssh->isConnected(),
            'Failed asserting that SSH2 is not connected after construction.'
        );

        $this->assertFalse(
            $ssh->isAuthenticated(),
            'Failed asserting that SSH2 is not authenticated after construction.'
        );

        $this->assertNotEmpty(
            $ssh->getServerPublicHostKey(),
            'Failed asserting that a non-empty public host key was fetched.'
        );

        $this->assertTrue(
            $ssh->isConnected(),
            'Failed asserting that SSH2 is connected after public key fetch.'
        );

        $this->assertNotEmpty(
            $ssh->getServerIdentification(),
            'Failed asserting that the server identifier was set after connect.'
        );

        return $ssh;
    }

    /**
     * @depends testPreLogin
     */
    public function testBadPassword($ssh)
    {
        $username = $this->getEnv('SSH_USERNAME');
        $password = $this->getEnv('SSH_PASSWORD');
        $this->assertFalse(
            $ssh->login($username, 'zzz' . $password),
            'SSH2 login using password succeeded.'
        );

        $this->assertTrue(
            $ssh->isConnected(),
            'Failed asserting that SSH2 is connected after bad login attempt.'
        );

        $this->assertFalse(
            $ssh->isAuthenticated(),
            'Failed asserting that SSH2 is not authenticated after bad login attempt.'
        );

        return $ssh;
    }

    /**
     * @depends testBadPassword
     */
    public function testPasswordLogin($ssh)
    {
        $username = $this->getEnv('SSH_USERNAME');
        $password = $this->getEnv('SSH_PASSWORD');
        $this->assertTrue(
            $ssh->login($username, $password),
            'SSH2 login using password failed.'
        );

        $this->assertTrue(
            $ssh->isAuthenticated(),
            'Failed asserting that SSH2 is authenticated after good login attempt.'
        );

        return $ssh;
    }

    /**
     * @depends testPasswordLogin
     * @group github280
     */
    public function testExecWithMethodCallback($ssh)
    {
        $callbackObject = $this->getMockBuilder('stdClass')
            ->setMethods(array('callbackMethod'))
            ->getMock();
        $callbackObject
            ->expects($this->atLeastOnce())
            ->method('callbackMethod')
            ->will($this->returnValue(true));
        $ssh->exec('pwd', array($callbackObject, 'callbackMethod'));

        return $ssh;
    }

    public function testGetServerPublicHostKey()
    {
        $ssh = new Net_SSH2($this->getEnv('SSH_HOSTNAME'));

        $this->assertInternalType('string', $ssh->getServerPublicHostKey());
    }

    public function testOpenSocketConnect()
    {
        $fsock = fsockopen($this->getEnv('SSH_HOSTNAME'), 22);
        $ssh = new Net_SSH2($fsock);

        $username = $this->getEnv('SSH_USERNAME');
        $password = $this->getEnv('SSH_PASSWORD');
        $this->assertTrue(
            $ssh->login($username, $password),
            'SSH2 login using an open socket failed.'
        );
    }

    /**
     * @depends testExecWithMethodCallback
     * @group github1009
     */
    public function testDisablePTY($ssh)
    {
        $ssh->enablePTY();
        $ssh->exec('ls -latr');
        $ssh->disablePTY();
        $ssh->exec('pwd');

        return $ssh;
    }

    /**
     * @depends testDisablePTY
     * @group github1167
     */
    public function testChannelDataAfterOpen($ssh)
    {
        $ssh->write("ping 127.0.0.1\n");

        $ssh->enablePTY();
        $ssh->exec('bash');

        $ssh->write("ls -latr\n");

        $ssh->setTimeout(1);

        $ssh->read();
    }
}
phpseclib-1.0.18/tests/PhpseclibFunctionalTestCase.php000066400000000000000000000037731354156543400230410ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

abstract class PhpseclibFunctionalTestCase extends PhpseclibTestCase
{
    public static function setUpBeforeClass()
    {
        if (extension_loaded('runkit')) {
            if (extension_loaded('gmp')) {
                self::ensureConstant(
                    'MATH_BIGINTEGER_MODE',
                    MATH_BIGINTEGER_MODE_GMP
                );
            } elseif (extension_loaded('bcmath')) {
                self::ensureConstant(
                    'MATH_BIGINTEGER_MODE',
                    MATH_BIGINTEGER_MODE_BCMATH
                );
            } else {
                self::markTestSkipped(
                    'Should have gmp or bcmath extension for functional test.'
                );
            }
            self::ensureConstant('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
            self::reRequireFile('Math/BigInteger.php');
            self::reRequireFile('Crypt/Hash.php');
        }
        parent::setUpBeforeClass();
    }

    /**
     * @param string $variable
     * @param string|null $message
     *
     * @return null
     */
    protected function requireEnv($variable, $message = null)
    {
        if ($this->_getEnv($variable) === false) {
            $msg = $message ? $message : sprintf(
                "This test requires the '%s' environment variable.",
                $this->_prefixEnvVariable($variable)
            );
            $this->markTestSkipped($msg);
        }
    }

    /**
     * @param string $variable
     *
     * @return string
     */
    protected function getEnv($variable)
    {
        $this->requireEnv($variable);
        return $this->_getEnv($variable);
    }

    private function _getEnv($variable)
    {
        return getenv($this->_prefixEnvVariable($variable));
    }

    private function _prefixEnvVariable($variable)
    {
        return 'PHPSECLIB_' . $variable;
    }
}
phpseclib-1.0.18/tests/PhpseclibTestCase.php000066400000000000000000000064311354156543400210100ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

abstract class PhpseclibTestCase extends PHPUnit\Framework\TestCase
{
    protected $tempFilesToUnlinkOnTearDown = array();

    public function tearDown()
    {
        foreach ($this->tempFilesToUnlinkOnTearDown as $filename) {
            if (!file_exists($filename) || unlink($filename)) {
                unset($this->tempFilesToUnlinkOnTearDown[$filename]);
            }
        }
        parent::tearDown();
    }

    /**
     * Creates a temporary file on the local filesystem and returns its path.
     * The $number_of_writes and $bytes_per_write parameters can be used to
     * write $number_of_writes * $bytes_per_write times the character 'a' to the
     * temporary file. All files created using this method will be deleted from
     * the filesystem on tearDown(), i.e. after each test method was run.
     *
     * @param int $number_of_writes
     * @param int $bytes_per_write
     *
     * @return string
     */
    protected function createTempFile($number_of_writes = 0, $bytes_per_write = 0)
    {
        $filename = tempnam(sys_get_temp_dir(), 'phpseclib-test-');
        $this->assertTrue(file_exists($filename));
        $this->tempFilesToUnlinkOnTearDown[] = $filename;
        if ($number_of_writes > 0 && $bytes_per_write > 0) {
            $fp = fopen($filename, 'wb');
            for ($i = 0; $i < $number_of_writes; ++$i) {
                fwrite($fp, str_repeat('a', $bytes_per_write));
            }
            fclose($fp);
            $this->assertSame($number_of_writes * $bytes_per_write, filesize($filename));
        }
        return $filename;
    }

    /**
     * @param string $constant
     * @param mixed $expected
     *
     * @return null
     */
    protected static function ensureConstant($constant, $expected)
    {
        if (defined($constant)) {
            $value = constant($constant);

            if ($value !== $expected) {
                if (extension_loaded('runkit')) {
                    if (!runkit_constant_redefine($constant, $expected)) {
                        self::markTestSkipped(sprintf(
                            "Failed to redefine constant %s to %s",
                            $constant,
                            $expected
                        ));
                    }
                } else {
                    self::markTestSkipped(sprintf(
                        "Skipping test because constant %s is %s instead of %s",
                        $constant,
                        $value,
                        $expected
                    ));
                }
            }
        } else {
            define($constant, $expected);
        }
    }

    /**
     * @param string $filename
     *
     * @return null
     */
    protected static function reRequireFile($filename)
    {
        if (extension_loaded('runkit')) {
            $result = runkit_import(
                $filename,
                RUNKIT_IMPORT_FUNCTIONS |
                RUNKIT_IMPORT_CLASS_METHODS |
                RUNKIT_IMPORT_OVERRIDE
            );

            if (!$result) {
                self::markTestSkipped("Failed to reimport file $filename");
            }
        }
    }
}
phpseclib-1.0.18/tests/Unit/000077500000000000000000000000001354156543400156455ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Crypt/000077500000000000000000000000001354156543400167465ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Crypt/AES/000077500000000000000000000000001354156543400173565ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Crypt/AES/InternalTest.php000066400000000000000000000005211354156543400225010ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_AES_InternalTest extends Unit_Crypt_AES_TestCase
{
    protected function setUp()
    {
        $this->engine = CRYPT_ENGINE_INTERNAL;
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/AES/McryptTest.php000066400000000000000000000005151354156543400222060ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_AES_McryptTest extends Unit_Crypt_AES_TestCase
{
    protected function setUp()
    {
        $this->engine = CRYPT_ENGINE_MCRYPT;
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/AES/OpenSSLTest.php000066400000000000000000000005211354156543400222100ustar00rootroot00000000000000
 * @copyright MMXIII Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_AES_OpenSSLTest extends Unit_Crypt_AES_TestCase
{
    protected function setUp()
    {
        $this->engine = CRYPT_ENGINE_OPENSSL;
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/AES/TestCase.php000066400000000000000000000321321354156543400216030ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/AES.php';

abstract class Unit_Crypt_AES_TestCase extends PhpseclibTestCase
{
    protected $engine;

    private function _checkEngine($aes)
    {
        if ($aes->getEngine() != $this->engine) {
            $engine = 'internal';
            switch ($this->engine) {
                case CRYPT_ENGINE_OPENSSL:
                    $engine = 'OpenSSL';
                    break;
                case CRYPT_ENGINE_MCRYPT:
                    $engine = 'mcrypt';
            }
            self::markTestSkipped('Unable to initialize ' . $engine . ' engine');
        }
    }

    /**
     * Produces all combinations of test values.
     *
     * @return array
     */
    public function continuousBufferCombos()
    {
        $modes = array(
            'CRYPT_MODE_CTR',
            'CRYPT_MODE_OFB',
            'CRYPT_MODE_CFB',
        );
        $plaintexts = array(
            '',
            '12345678901234567', // https://github.com/phpseclib/phpseclib/issues/39
            "\xDE\xAD\xBE\xAF",
            ':-):-):-):-):-):-)', // https://github.com/phpseclib/phpseclib/pull/43
        );
        $ivs = array(
            '',
            'test123',
        );
        $keys = array(
            '',
            ':-8', // https://github.com/phpseclib/phpseclib/pull/43
            'FOOBARZ',
        );

        $result = array();

        foreach ($modes as $mode) {
            foreach ($plaintexts as $plaintext) {
                foreach ($ivs as $iv) {
                    foreach ($keys as $key) {
                        $result[] = array($mode, $plaintext, $iv, $key);
                    }
                }
            }
        }

        return $result;
    }

    /**
     * @dataProvider continuousBufferCombos
     */
    public function testEncryptDecryptWithContinuousBuffer($mode, $plaintext, $iv, $key)
    {
        $aes = new Crypt_AES(constant($mode));
        $aes->setPreferredEngine($this->engine);
        $aes->enableContinuousBuffer();
        $aes->setIV($iv);
        $aes->setKey($key);

        $this->_checkEngine($aes);

        $actual = '';
        for ($i = 0, $strlen = strlen($plaintext); $i < $strlen; ++$i) {
            $actual .= $aes->decrypt($aes->encrypt($plaintext[$i]));
        }

        $this->assertEquals($plaintext, $actual);
    }

    /**
     * @group github451
     */
    public function testKeyPaddingRijndael()
    {
        // this test case is from the following URL:
        // https://web.archive.org/web/20070209120224/http://fp.gladman.plus.com/cryptography_technology/rijndael/aesdvec.zip

        $aes = new Crypt_Rijndael();
        $aes->setPreferredEngine($this->engine);
        $aes->disablePadding();
        $aes->setKey(pack('H*', '2b7e151628aed2a6abf7158809cf4f3c762e7160')); // 160-bit key. Valid in Rijndael.
        //$this->_checkEngine($aes); // should only work in internal mode
        $ciphertext = $aes->encrypt(pack('H*', '3243f6a8885a308d313198a2e0370734'));
        $this->assertEquals($ciphertext, pack('H*', '231d844639b31b412211cfe93712b880'));
    }

    /**
     * @group github451
     */
    public function testKeyPaddingAES()
    {
        // same as the above - just with a different ciphertext

        $aes = new Crypt_AES();
        $aes->setPreferredEngine($this->engine);
        $aes->disablePadding();
        $aes->setKey(pack('H*', '2b7e151628aed2a6abf7158809cf4f3c762e7160')); // 160-bit key. AES should null pad to 192-bits
        $this->_checkEngine($aes);
        $ciphertext = $aes->encrypt(pack('H*', '3243f6a8885a308d313198a2e0370734'));
        $this->assertEquals($ciphertext, pack('H*', 'c109292b173f841b88e0ee49f13db8c0'));
    }

    /**
     * Produces all combinations of test values.
     *
     * @return array
     */
    public function continuousBufferBatteryCombos()
    {
        $modes = array(
            'CRYPT_MODE_CTR',
            'CRYPT_MODE_OFB',
            'CRYPT_MODE_CFB',
        );

        $combos = array(
            array(16),
            array(17),
            array(1, 16),
            array(3, 6, 7), // (3 to test the openssl_encrypt call and the buffer creation, 6 to test the exclusive use of the buffer and 7 to test the buffer's exhaustion and recreation)
            array(15, 4), // (15 to test openssl_encrypt call and buffer creation and 4 to test something that spans multpile bloc
            array(3, 6, 10, 16), // this is why the strlen check in the buffer-only code was needed
            array(16, 16), // two full size blocks
            array(3, 6, 7, 16), // partial block + full size block
            array(16, 3, 6, 7),
            // a few others just for fun
            array(32,32),
            array(31,31),
            array(17,17),
            array(99, 99)
        );

        $result = array();

        foreach ($modes as $mode) {
            foreach ($combos as $combo) {
                foreach (array('encrypt', 'decrypt') as $op) {
                    $result[] = array($op, $mode, $combo);
                }
            }
        }

        return $result;
    }

    /**
     * @dataProvider continuousBufferBatteryCombos
     */
    public function testContinuousBufferBattery($op, $mode, $test)
    {
        $iv = str_repeat('x', 16);
        $key = str_repeat('a', 16);

        $aes = new Crypt_AES(constant($mode));
        $aes->setPreferredEngine($this->engine);
        $aes->setKey($key);
        $aes->setIV($iv);

        $this->_checkEngine($aes);

        $str = '';
        $result = '';
        foreach ($test as $len) {
            $temp = str_repeat('d', $len);
            $str.= $temp;
        }

        $c1 = $aes->$op($str);

        $aes = new Crypt_AES(constant($mode));
        $aes->setPreferredEngine($this->engine);
        $aes->enableContinuousBuffer();
        $aes->setKey($key);
        $aes->setIV($iv);

        if (!$this->_checkEngine($aes)) {
            return;
        }

        foreach ($test as $len) {
            $temp = str_repeat('d', $len);
            $output = $aes->$op($temp);
            $result.= $output;
        }

        $c2 = $result;

        $this->assertSame(bin2hex($c1), bin2hex($c2));
    }

    /**
     * Pretty much the same as testContinuousBufferBattery with the caveat that continuous mode is not enabled.
     *
     * @dataProvider continuousBufferBatteryCombos
     */
    public function testNonContinuousBufferBattery($op, $mode, $test)
    {
        if (count($test) == 1) {
            return;
        }

        $iv = str_repeat('x', 16);
        $key = str_repeat('a', 16);

        $aes = new Crypt_AES(constant($mode));
        $aes->setPreferredEngine($this->engine);
        $aes->setKey($key);
        $aes->setIV($iv);

        $this->_checkEngine($aes);

        $str = '';
        $result = '';
        foreach ($test as $len) {
            $temp = str_repeat('d', $len);
            $str.= $temp;
        }

        $c1 = $aes->$op($str);

        $aes = new Crypt_AES(constant($mode));
        $aes->setPreferredEngine($this->engine);
        $aes->setKey($key);
        $aes->setIV($iv);

        $this->_checkEngine($aes);

        foreach ($test as $len) {
            $temp = str_repeat('d', $len);
            $output = $aes->$op($temp);
            $result.= $output;
        }

        $c2 = $result;

        $this->assertNotSame(bin2hex($c1), bin2hex($c2));
    }

    // from http://csrc.nist.gov/groups/STM/cavp/documents/aes/AESAVS.pdf#page=16
    public function testGFSBox128()
    {
        $aes = new Crypt_AES();

        $aes->setKey(pack('H*', '00000000000000000000000000000000'));
        $aes->setIV(pack('H*', '00000000000000000000000000000000'));
        $aes->disablePadding();

        $aes->setPreferredEngine($this->engine);
        $this->_checkEngine($aes);

        $result = bin2hex($aes->encrypt(pack('H*', 'f34481ec3cc627bacd5dc3fb08f273e6')));
        $this->assertSame($result, '0336763e966d92595a567cc9ce537f5e');
        $result = bin2hex($aes->encrypt(pack('H*', '9798c4640bad75c7c3227db910174e72')));
        $this->assertSame($result, 'a9a1631bf4996954ebc093957b234589');
        $result = bin2hex($aes->encrypt(pack('H*', '96ab5c2ff612d9dfaae8c31f30c42168')));
        $this->assertSame($result, 'ff4f8391a6a40ca5b25d23bedd44a597');
        $result = bin2hex($aes->encrypt(pack('H*', '6a118a874519e64e9963798a503f1d35')));
        $this->assertSame($result, 'dc43be40be0e53712f7e2bf5ca707209');
        $result = bin2hex($aes->encrypt(pack('H*', 'cb9fceec81286ca3e989bd979b0cb284')));
        $this->assertSame($result, '92beedab1895a94faa69b632e5cc47ce');
        $result = bin2hex($aes->encrypt(pack('H*', 'b26aeb1874e47ca8358ff22378f09144')));
        $this->assertSame($result, '459264f4798f6a78bacb89c15ed3d601');
        $result = bin2hex($aes->encrypt(pack('H*', '58c8e00b2631686d54eab84b91f0aca1')));
        $this->assertSame($result, '08a4e2efec8a8e3312ca7460b9040bbf');
    }

    public function testGFSBox192()
    {
        $aes = new Crypt_AES();

        $aes->setKey(pack('H*', '000000000000000000000000000000000000000000000000'));
        $aes->setIV(pack('H*', '00000000000000000000000000000000'));
        $aes->disablePadding();

        $aes->setPreferredEngine($this->engine);
        $this->_checkEngine($aes);

        $result = bin2hex($aes->encrypt(pack('H*', '1b077a6af4b7f98229de786d7516b639')));
        $this->assertSame($result, '275cfc0413d8ccb70513c3859b1d0f72');
        $result = bin2hex($aes->encrypt(pack('H*', '9c2d8842e5f48f57648205d39a239af1')));
        $this->assertSame($result, 'c9b8135ff1b5adc413dfd053b21bd96d');
        $result = bin2hex($aes->encrypt(pack('H*', 'bff52510095f518ecca60af4205444bb')));
        $this->assertSame($result, '4a3650c3371ce2eb35e389a171427440');
        $result = bin2hex($aes->encrypt(pack('H*', '51719783d3185a535bd75adc65071ce1')));
        $this->assertSame($result, '4f354592ff7c8847d2d0870ca9481b7c');
        $result = bin2hex($aes->encrypt(pack('H*', '26aa49dcfe7629a8901a69a9914e6dfd')));
        $this->assertSame($result, 'd5e08bf9a182e857cf40b3a36ee248cc');
        $result = bin2hex($aes->encrypt(pack('H*', '941a4773058224e1ef66d10e0a6ee782')));
        $this->assertSame($result, '067cd9d3749207791841562507fa9626');
    }

    public function testGFSBox256()
    {
        $aes = new Crypt_AES();

        $aes->setKey(pack('H*', '00000000000000000000000000000000' . '00000000000000000000000000000000'));
        $aes->setIV(pack('H*', '00000000000000000000000000000000'));
        $aes->disablePadding();

        $aes->setPreferredEngine($this->engine);
        $this->_checkEngine($aes);

        $result = bin2hex($aes->encrypt(pack('H*', '014730f80ac625fe84f026c60bfd547d')));
        $this->assertSame($result, '5c9d844ed46f9885085e5d6a4f94c7d7');
        $result = bin2hex($aes->encrypt(pack('H*', '0b24af36193ce4665f2825d7b4749c98')));
        $this->assertSame($result, 'a9ff75bd7cf6613d3731c77c3b6d0c04');
        $result = bin2hex($aes->encrypt(pack('H*', '761c1fe41a18acf20d241650611d90f1')));
        $this->assertSame($result, '623a52fcea5d443e48d9181ab32c7421');
        $result = bin2hex($aes->encrypt(pack('H*', '8a560769d605868ad80d819bdba03771')));
        $this->assertSame($result, '38f2c7ae10612415d27ca190d27da8b4');
        $result = bin2hex($aes->encrypt(pack('H*', '91fbef2d15a97816060bee1feaa49afe')));
        $this->assertSame($result, '1bc704f1bce135ceb810341b216d7abe');
    }

    public function testGetKeyLengthDefault()
    {
        $aes = new Crypt_AES();
        $this->assertSame($aes->getKeyLength(), 128);
    }

    public function testGetKeyLengthWith192BitKey()
    {
        $aes = new Crypt_AES();
        $aes->setKey(str_repeat('a', 24));
        $this->assertSame($aes->getKeyLength(), 192);
    }

    public function testSetKeyLengthWithLargerKey()
    {
        $aes = new Crypt_AES();
        $aes->setKeyLength(128);
        $aes->setKey(str_repeat('a', 24));
        $this->assertSame($aes->getKeyLength(), 128);
        $ciphertext = bin2hex($aes->encrypt('a'));
        $this->assertSame($ciphertext, '82b7b068dfc60ed2a46893b69fecd6c2');
        $this->assertSame($aes->getKeyLength(), 128);
    }

    public function testSetKeyLengthWithSmallerKey()
    {
        $aes = new Crypt_AES();
        $aes->setKeyLength(256);
        $aes->setKey(str_repeat('a', 16));
        $this->assertSame($aes->getKeyLength(), 256);
        $ciphertext = bin2hex($aes->encrypt('a'));
        $this->assertSame($ciphertext, 'fd4250c0d234aa7e1aa592820aa8406b');
        $this->assertSame($aes->getKeyLength(), 256);
    }

    /**
     * @group github938
     */
    public function testContinuousBuffer()
    {
        $aes = new Crypt_AES();
        $aes->disablePadding();
        $aes->enableContinuousBuffer();
        $aes->setIV(pack('H*', '0457bdb4a6712986688349a29eb82535'));
        $aes->setKey(pack('H*', '00d596e2c8189b2592fac358e7396ad2'));
        $aes->decrypt(pack('H*', '9aa234ea7c750a8109a0f32d768b964e'));
        $plaintext = $aes->decrypt(pack('H*', '0457bdb4a6712986688349a29eb82535'));
        $expected = pack('H*', '6572617574689e1be8d2d8d43c594cf3');
        $this->assertSame($plaintext, $expected);
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/BlowfishTest.php000066400000000000000000000156441354156543400221060ustar00rootroot00000000000000
 * @copyright MMXIII Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/Blowfish.php';
require_once 'Crypt/Random.php';

class Unit_Crypt_BlowfishTest extends PhpseclibTestCase
{
    public function engineVectors()
    {
        $engines = array(
            CRYPT_ENGINE_INTERNAL => 'internal',
            CRYPT_ENGINE_MCRYPT => 'mcrypt',
            CRYPT_ENGINE_OPENSSL => 'OpenSSL',
        );

        // tests from https://www.schneier.com/code/vectors.txt
        $tests = array(
            // key, plaintext, ciphertext
            array(pack('H*', '0000000000000000'), pack('H*', '0000000000000000'), pack('H*', '4EF997456198DD78')),
            array(pack('H*', 'FFFFFFFFFFFFFFFF'), pack('H*', 'FFFFFFFFFFFFFFFF'), pack('H*', '51866FD5B85ECB8A')),
            array(pack('H*', '3000000000000000'), pack('H*', '1000000000000001'), pack('H*', '7D856F9A613063F2')),
            array(pack('H*', '1111111111111111'), pack('H*', '1111111111111111'), pack('H*', '2466DD878B963C9D')),
            array(pack('H*', '0123456789ABCDEF'), pack('H*', '1111111111111111'), pack('H*', '61F9C3802281B096')),
            array(pack('H*', '1111111111111111'), pack('H*', '0123456789ABCDEF'), pack('H*', '7D0CC630AFDA1EC7')),
            array(pack('H*', '0000000000000000'), pack('H*', '0000000000000000'), pack('H*', '4EF997456198DD78')),
            array(pack('H*', 'FEDCBA9876543210'), pack('H*', '0123456789ABCDEF'), pack('H*', '0ACEAB0FC6A0A28D')),
            array(pack('H*', '7CA110454A1A6E57'), pack('H*', '01A1D6D039776742'), pack('H*', '59C68245EB05282B')),
            array(pack('H*', '0131D9619DC1376E'), pack('H*', '5CD54CA83DEF57DA'), pack('H*', 'B1B8CC0B250F09A0')),
            array(pack('H*', '07A1133E4A0B2686'), pack('H*', '0248D43806F67172'), pack('H*', '1730E5778BEA1DA4')),
            array(pack('H*', '3849674C2602319E'), pack('H*', '51454B582DDF440A'), pack('H*', 'A25E7856CF2651EB')),
            array(pack('H*', '04B915BA43FEB5B6'), pack('H*', '42FD443059577FA2'), pack('H*', '353882B109CE8F1A')),
            array(pack('H*', '0113B970FD34F2CE'), pack('H*', '059B5E0851CF143A'), pack('H*', '48F4D0884C379918')),
            array(pack('H*', '0170F175468FB5E6'), pack('H*', '0756D8E0774761D2'), pack('H*', '432193B78951FC98')),
            array(pack('H*', '43297FAD38E373FE'), pack('H*', '762514B829BF486A'), pack('H*', '13F04154D69D1AE5')),
            array(pack('H*', '07A7137045DA2A16'), pack('H*', '3BDD119049372802'), pack('H*', '2EEDDA93FFD39C79')),
            array(pack('H*', '04689104C2FD3B2F'), pack('H*', '26955F6835AF609A'), pack('H*', 'D887E0393C2DA6E3')),
            array(pack('H*', '37D06BB516CB7546'), pack('H*', '164D5E404F275232'), pack('H*', '5F99D04F5B163969')),
            array(pack('H*', '1F08260D1AC2465E'), pack('H*', '6B056E18759F5CCA'), pack('H*', '4A057A3B24D3977B')),
            array(pack('H*', '584023641ABA6176'), pack('H*', '004BD6EF09176062'), pack('H*', '452031C1E4FADA8E')),
            array(pack('H*', '025816164629B007'), pack('H*', '480D39006EE762F2'), pack('H*', '7555AE39F59B87BD')),
            array(pack('H*', '49793EBC79B3258F'), pack('H*', '437540C8698F3CFA'), pack('H*', '53C55F9CB49FC019')),
            array(pack('H*', '4FB05E1515AB73A7'), pack('H*', '072D43A077075292'), pack('H*', '7A8E7BFA937E89A3')),
            array(pack('H*', '49E95D6D4CA229BF'), pack('H*', '02FE55778117F12A'), pack('H*', 'CF9C5D7A4986ADB5')),
            array(pack('H*', '018310DC409B26D6'), pack('H*', '1D9D5C5018F728C2'), pack('H*', 'D1ABB290658BC778')),
            array(pack('H*', '1C587F1C13924FEF'), pack('H*', '305532286D6F295A'), pack('H*', '55CB3774D13EF201')),
            array(pack('H*', '0101010101010101'), pack('H*', '0123456789ABCDEF'), pack('H*', 'FA34EC4847B268B2')),
            array(pack('H*', '1F1F1F1F0E0E0E0E'), pack('H*', '0123456789ABCDEF'), pack('H*', 'A790795108EA3CAE')),
            array(pack('H*', 'E0FEE0FEF1FEF1FE'), pack('H*', '0123456789ABCDEF'), pack('H*', 'C39E072D9FAC631D')),
            array(pack('H*', '0000000000000000'), pack('H*', 'FFFFFFFFFFFFFFFF'), pack('H*', '014933E0CDAFF6E4')),
            array(pack('H*', 'FFFFFFFFFFFFFFFF'), pack('H*', '0000000000000000'), pack('H*', 'F21E9A77B71C49BC')),
            array(pack('H*', '0123456789ABCDEF'), pack('H*', '0000000000000000'), pack('H*', '245946885754369A')),
            array(pack('H*', 'FEDCBA9876543210'), pack('H*', 'FFFFFFFFFFFFFFFF'), pack('H*', '6B5C5A9C5D9E0A5A'))
        );

        $result = array();

        foreach ($engines as $engine => $engineName) {
            foreach ($tests as $test) {
                $result[] = array($engine, $engineName, $test[0], $test[1], $test[2]);
            }
        }

        return $result;
    }

    /**
     * @dataProvider engineVectors
     */
    public function testVectors($engine, $engineName, $key, $plaintext, $expected)
    {
        $bf = new Crypt_Blowfish();
        $bf->setKey($key);
        if (!$bf->isValidEngine($engine)) {
            self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
        }
        $bf->setPreferredEngine($engine);
        $bf->disablePadding();
        $result = $bf->encrypt($plaintext);
        $plaintext = bin2hex($plaintext);
        $this->assertEquals($result, $expected, "Failed asserting that $plaintext yielded expected output in $engineName engine");
    }

    public function testKeySizes()
    {
        $objects = $engines = array();
        $temp = new Crypt_Blowfish(CRYPT_MODE_CTR);
        $temp->setPreferredEngine(CRYPT_ENGINE_INTERNAL);
        $objects[] = $temp;
        $engines[] = 'internal';

        if ($temp->isValidEngine(CRYPT_ENGINE_MCRYPT)) {
            $temp = new Crypt_Blowfish(CRYPT_MODE_CTR);
            $temp->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
            $objects[] = $temp;
            $engines[] = 'mcrypt';
        }

        if ($temp->isValidEngine(CRYPT_ENGINE_OPENSSL)) {
            $temp = new Crypt_Blowfish(CRYPT_MODE_CTR);
            $temp->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
            $objects[] = $temp;
            $engines[] = 'OpenSSL';
        }

        if (count($objects) < 2) {
            self::markTestSkipped('Unable to initialize two or more engines');
        }

        for ($i = 0; $i < count($objects); $i++) {
            $objects[$i]->setIV(str_repeat('x', $objects[$i]->getBlockLength() >> 3));
        }

        $plaintext = str_repeat('.', 100);

        for ($keyLen = 4; $keyLen <= 56; $keyLen++) {
            $key = crypt_random_string($keyLen);
            $objects[0]->setKey($key);
            $ref = $objects[0]->encrypt($plaintext);
            for ($i = 1; $i < count($objects); $i++) {
                $objects[$i]->setKey($key);
                $this->assertEquals($ref, $objects[$i]->encrypt($plaintext), "Failed asserting that {$engines[$i]} yields the same output as the internal engine with a key size of $keyLen");
            }
        }
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/DESTest.php000066400000000000000000000062361354156543400207410ustar00rootroot00000000000000
 * @copyright MMXIII Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/DES.php';

// the AES tests establish the correctness of the modes of operation. this test is inteded to establish the consistency of
// key and iv padding between the multiple engines
class Unit_Crypt_DESTest extends PhpseclibTestCase
{
    public function testEncryptPadding()
    {
        $des = new Crypt_DES(CRYPT_MODE_CBC);
        $des->setKey('d');
        $des->setIV('d');

        $des->setPreferredEngine(CRYPT_ENGINE_INTERNAL);

        $result = pack('H*', '3e7613642049af1e');

        $internal = $des->encrypt('d');
        $this->assertEquals($result, $internal, 'Failed asserting that the internal engine produced the correct result');

        $des->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
        if ($des->getEngine() == CRYPT_ENGINE_MCRYPT) {
            $mcrypt = $des->encrypt('d');
            $this->assertEquals($result, $mcrypt, 'Failed asserting that the mcrypt engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize mcrypt engine');
        }

        $des->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
        if ($des->getEngine() == CRYPT_ENGINE_OPENSSL) {
            $openssl = $des->encrypt('d');
            $this->assertEquals($result, $openssl, 'Failed asserting that the OpenSSL engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize OpenSSL engine');
        }
    }

    // phpseclib null pads ciphertext's if they're not long enough and you're in ecb / cbc mode. this silent failure mode is consistent
    // with mcrypt's behavior. maybe throwing an exception would be better but whatever. this test is more intended to establish consistent
    // behavior between the various engine's
    public function testDecryptPadding()
    {
        $des = new Crypt_DES(CRYPT_MODE_CBC);
        $des->disablePadding();
        // when the key and iv are not specified they should be null padded
        //$des->setKey();
        //$des->setIV();

        $des->setPreferredEngine(CRYPT_ENGINE_INTERNAL);
        $internal = $des->decrypt('d');

        $result = pack('H*', '79b305d1ce555221');
        $this->assertEquals($result, $internal, 'Failed asserting that the internal engine produced the correct result');

        $des->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
        if ($des->getEngine() == CRYPT_ENGINE_MCRYPT) {
            $mcrypt = $des->decrypt('d');
            $this->assertEquals($result, $mcrypt, 'Failed asserting that the mcrypt engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize mcrypt engine');
        }

        $des->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
        if ($des->getEngine() == CRYPT_ENGINE_OPENSSL) {
            $openssl = $des->decrypt('d');
            $this->assertEquals($result, $openssl, 'Failed asserting that the OpenSSL engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize OpenSSL engine');
        }
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/000077500000000000000000000000001354156543400176315ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Crypt/Hash/MD5Test.php000066400000000000000000000024311354156543400215670ustar00rootroot00000000000000
 * @copyright 2012 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_Hash_MD5Test extends Unit_Crypt_Hash_TestCase
{
    public function getInstance()
    {
        return new Crypt_Hash('md5');
    }

    /**
     * @dataProvider hashData()
     */
    public function testHash($message, $result)
    {
        $this->assertHashesTo($this->getInstance(), $message, $result);
    }

    public static function hashData()
    {
        return array(
            array('', 'd41d8cd98f00b204e9800998ecf8427e'),
            array('The quick brown fox jumps over the lazy dog', '9e107d9d372bb6826bd81d3542a419d6'),
            array('The quick brown fox jumps over the lazy dog.', 'e4d909c290d0fb1ca068ffaddf22cbd0'),
        );
    }

    /**
     * @dataProvider hmacData()
     */
    public function testHMAC($key, $message, $result)
    {
        $this->assertHMACsTo($this->getInstance(), $key, $message, $result);
    }

    public static function hmacData()
    {
        return array(
            array('', '', '74e6f7298a9c2d168935f58c001bad88'),
            array('key', 'The quick brown fox jumps over the lazy dog', '80070713463e7749b90c2dc24911e275'),
        );
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/SHA256Test.php000066400000000000000000000051251354156543400220550ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_Hash_SHA256Test extends Unit_Crypt_Hash_TestCase
{
    public function getInstance()
    {
        return new Crypt_Hash('sha256');
    }

    /**
     * @dataProvider hashData()
     */
    public function testHash($message, $result)
    {
        $this->assertHashesTo($this->getInstance(), $message, $result);
    }

    public static function hashData()
    {
        return array(
            array(
                '',
                'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'
            ),
            array(
                'The quick brown fox jumps over the lazy dog',
                'd7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592',
            ),
            array(
                'The quick brown fox jumps over the lazy dog.',
                'ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c',
            ),
        );
    }

    /**
     * @dataProvider hmacData()
     */
    public function testHMAC($key, $message, $result)
    {
        $this->assertHMACsTo($this->getInstance(), $key, $message, $result);
    }

    public static function hmacData()
    {
        return array(
            // RFC 4231
            // Test Case 1
            array(
                pack('H*', '0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b'),
                pack('H*', '4869205468657265'),
                'b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7',
            ),
            // Test Case 2
            array(
                pack('H*', '4a656665'),
                pack('H*', '7768617420646f2079612077616e7420666f72206e6f7468696e673f'),
                '5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843',
            ),
            // Test Case 3
            array(
                pack('H*', 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'),
                pack('H*', 'dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd'),
                '773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe',
            ),
            // Test Case 4
            array(
                pack('H*', '0102030405060708090a0b0c0d0e0f10111213141516171819'),
                pack('H*', 'cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd'),
                '82558a389a443c0ea4cc819899f2083a85f0faa3e578f8077a2e3ff46729665b',
            ),
        );
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/SHA256_96Test.php000066400000000000000000000013041354156543400223660ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_Hash_SHA256_96Test extends Unit_Crypt_Hash_SHA256Test
{
    public function getInstance()
    {
        return new Crypt_Hash('sha256-96');
    }

    /**
     * @dataProvider hashData()
     */
    public function testHash($message, $longResult)
    {
        parent::testHash($message, substr($longResult, 0, 24));
    }

    /**
     * @dataProvider hmacData()
     */
    public function testHMAC($key, $message, $longResult)
    {
        parent::testHMAC($key, $message, substr($longResult, 0, 24));
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/SHA512Test.php000066400000000000000000000060251354156543400220500ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_Hash_SHA512Test extends Unit_Crypt_Hash_TestCase
{
    public function getInstance()
    {
        return new Crypt_Hash('sha512');
    }

    /**
     * @dataProvider hashData()
     */
    public function testHash($message, $result)
    {
        $this->assertHashesTo($this->getInstance(), $message, $result);
    }

    public static function hashData()
    {
        return array(
            array(
                '',
                'cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e'
            ),
            array(
                'The quick brown fox jumps over the lazy dog',
                '07e547d9586f6a73f73fbac0435ed76951218fb7d0c8d788a309d785436bbb642e93a252a954f23912547d1e8a3b5ed6e1bfd7097821233fa0538f3db854fee6',
            ),
            array(
                'The quick brown fox jumps over the lazy dog.',
                '91ea1245f20d46ae9a037a989f54f1f790f0a47607eeb8a14d12890cea77a1bbc6c7ed9cf205e67b7f2b8fd4c7dfd3a7a8617e45f3c463d481c7e586c39ac1ed',
            ),
        );
    }

    /**
     * @dataProvider hmacData()
     */
    public function testHMAC($key, $message, $result)
    {
        $this->assertHMACsTo($this->getInstance(), $key, $message, $result);
    }

    public static function hmacData()
    {
        return array(
            // RFC 4231
            // Test Case 1
            array(
                pack('H*', '0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b'),
                pack('H*', '4869205468657265'),
                '87aa7cdea5ef619d4ff0b4241a1d6cb02379f4e2ce4ec2787ad0b30545e17cdedaa833b7d6b8a702038b274eaea3f4e4be9d914eeb61f1702e696c203a126854',
            ),
            // Test Case 2
            array(
                pack('H*', '4a656665'),
                pack('H*', '7768617420646f2079612077616e7420666f72206e6f7468696e673f'),
                '164b7a7bfcf819e2e395fbe73b56e0a387bd64222e831fd610270cd7ea2505549758bf75c05a994a6d034f65f8f0e6fdcaeab1a34d4a6b4b636e070a38bce737',
            ),
            // Test Case 3
            array(
                pack('H*', 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'),
                pack('H*', 'dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd'),
                'fa73b0089d56a284efb0f0756c890be9b1b5dbdd8ee81a3655f83e33b2279d39bf3e848279a722c806b485a47e67c807b946a337bee8942674278859e13292fb',
            ),
            // Test Case 4
            array(
                pack('H*', '0102030405060708090a0b0c0d0e0f10111213141516171819'),
                pack('H*', 'cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd'),
                'b0ba465637458c6990e5a8c5f61d4af7e576d97ff94b872de76f8050361ee3dba91ca5c11aa25eb4d679275cc5788063a5f19741120c4f2de2adebeb10a298dd',
            ),
        );
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/SHA512_96Test.php000066400000000000000000000013041354156543400223610ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_Hash_SHA512_96Test extends Unit_Crypt_Hash_SHA512Test
{
    public function getInstance()
    {
        return new Crypt_Hash('sha512-96');
    }

    /**
     * @dataProvider hashData()
     */
    public function testHash($message, $longResult)
    {
        parent::testHash($message, substr($longResult, 0, 24));
    }

    /**
     * @dataProvider hmacData()
     */
    public function testHMAC($key, $message, $longResult)
    {
        parent::testHMAC($key, $message, substr($longResult, 0, 24));
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/Hash/TestCase.php000066400000000000000000000026771354156543400220710ustar00rootroot00000000000000
 * @copyright 2012 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/Hash.php';

abstract class Unit_Crypt_Hash_TestCase extends PhpseclibTestCase
{
    public static function setUpBeforeClass()
    {
        if (!defined('CRYPT_HASH_MODE')) {
            define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
        }
    }

    public function setUp()
    {
        if (defined('CRYPT_HASH_MODE') && CRYPT_HASH_MODE !== CRYPT_HASH_MODE_INTERNAL) {
            $this->markTestSkipped(
                'Skipping test because CRYPT_HASH_MODE is not defined as CRYPT_HASH_MODE_INTERNAL.'
            );
        }
    }

    protected function assertHashesTo(Crypt_Hash $hash, $message, $expected)
    {
        $this->assertEquals(
            strtolower($expected),
            bin2hex($hash->hash($message)),
            sprintf("Failed asserting that '%s' hashes to '%s'.", $message, $expected)
        );
    }

    protected function assertHMACsTo(Crypt_Hash $hash, $key, $message, $expected)
    {
        $hash->setKey($key);

        $this->assertEquals(
            strtolower($expected),
            bin2hex($hash->hash($message)),
            sprintf(
                "Failed asserting that '%s' HMACs to '%s' with key '%s'.",
                $message,
                $expected,
                $key
            )
        );
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/RC2Test.php000066400000000000000000000161501354156543400207100ustar00rootroot00000000000000
 * @copyright MMXIII Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/RC2.php';

class Unit_Crypt_RC2Test extends PhpseclibTestCase
{
    var $engines = array(
        CRYPT_ENGINE_INTERNAL => 'internal',
        CRYPT_ENGINE_MCRYPT => 'mcrypt',
        CRYPT_ENGINE_OPENSSL => 'OpenSSL',
    );

    public function engineVectors()
    {
        // tests from https://tools.ietf.org/html/rfc2268#page-8
        $tests = array(
            // key, effective key length, plaintext, ciphertext
            array('0000000000000000', 63, '0000000000000000', 'ebb773f993278eff'),
            array('ffffffffffffffff', 64, 'ffffffffffffffff', '278b27e42e2f0d49'),
            array('3000000000000000', 64, '1000000000000001', '30649edf9be7d2c2'),
            array('88', 64, '0000000000000000', '61a8a244adacccf0'),
            array('88bca90e90875a', 64, '0000000000000000', '6ccf4308974c267f'),
            array('88bca90e90875a7f0f79c384627bafb2', 64, '0000000000000000', '1a807d272bbe5db1'),
            array('88bca90e90875a7f0f79c384627bafb2', 128, '0000000000000000', '2269552ab0f85ca6'),
            array('88bca90e90875a7f0f79c384627bafb216f80a6f85920584c42fceb0be255daf1e', 129, '0000000000000000', '5b78d3a43dfff1f1')
        );

        $result = array();

        foreach ($this->engines as $engine => $engineName) {
            foreach ($tests as $test) {
                $result[] = array($engine, $engineName, $test[0], $test[1], $test[2], $test[3]);
            }
        }

        return $result;
    }

    // this test is just confirming RC2's key expansion
    public function testEncryptPadding()
    {
        $rc2 = new Crypt_RC2(CRYPT_MODE_ECB);

        // unlike Crypt_AES / Crypt_Rijndael, when you tell Crypt_RC2 that the key length is 128-bits the key isn't null padded to that length.
        // instead, RC2 key expansion is used to extend it out to that length. this isn't done for AES / Rijndael since that doesn't define any
        // sort of key expansion algorithm.

        // admittedly, phpseclib is inconsistent in this regard. RC4 and Blowfish support arbitrary key lengths between a certain range, as well,
        // and they don't have any way to set the key length. but then again, neither do those algorithms have their own key expansion algorithm,
        // whereas RC2 does. and technically, AES / Rijndael (and even Twofish) don't support arbitrary key lengths - they support variable key
        // lengths. so in some ways, i suppose this inconsistency somewhat makes sense, although the fact that Crypt_Twofish doesn't have a
        // setKeyLength() function whereas Crypt_AES / Crypt_Rijndael do not is, itself, an inconsistency.

        // but that said, Crypt_RC2 is inconsistent in other ways: if you pass a 128-bit (16-byte) key to it via setKey() the key is not treated
        // as a 128-bit key but rather as a 1024-bit key and is expanded accordingly, not via null padding, but via RC2's key expansion algorithm.

        // this behavior is in contrast to mcrypt, which extends keys via null padding to 1024 bits. it is also in contrast to OpenSSL, which
        // extends keys, via null padding, to 128 bits. mcrypt's approach seems preferable as one can simulate 128 bit keys by using RC2's
        // key expansion algorithm to extend the key to 1024 bits and then changing the first byte of the new key with an inverse pitable mapping.
        // in contrast, to my knowledge, there is no technique for expanding a key less than 128 bits to 128 bits, via RC2 key expansion. the only
        // scenario in that regard is null padding.

        // simple truncation is insufficient, since, quoting RFC2268, "the purpose of the key-expansion algorithm [in RC2] is to modify the key buffer
        // so that each bit of the expanded key depends in a complicated way on every bit of the supplied input key".

        // now, to OpenSSL's credit, null padding is internally consistent with OpenSSL. OpenSSL only supports fixed length keys. For rc2, rc4 and
        // bf (blowfish), all keys are 128 bits (or are null padded / truncated accordingly). to use 40-bit or 64-bit keys with RC4 with OpenSSL you
        // don't use the rc4 algorithm - you use the rc4-40 or rc4-64 algorithm. and similarly, it's not aes-cbc that you use - it's either aes-128-cbc
        // or aes-192-cbc or aes-256-cbc. this is in contrast to mcrypt, which (with the exception of RC2) actually supports variable and arbitrary
        // length keys.

        // superficially, it seens like Rijndael would be another exception to mcrypt's key length handling, but it in fact is not. the reason being that,
        // with mcrypt, when you specify MCRYPT_RIJNDAEL_128 or MCRYPT_RIJNDAEL_192 or MCRYPT_RIJNDAEL_256 the numbers at the end aren't referring to the
        // key length, but rather, the block length. ie. Rijndael, unlike most block ciphers, doesn't just have a variable (but not arbitrary) key length -
        // it also has a variable block length. AES's block length, however, is not variable, so technically, only MCRYPT_RIJNDAEL_128 is AES.

        $rc2->setKey(str_repeat('d', 16), 128);

        $rc2->setPreferredEngine(CRYPT_ENGINE_INTERNAL);
        $internal = $rc2->encrypt('d');

        $result = pack('H*', 'e3b36057f4821346');
        $this->assertEquals($result, $internal, 'Failed asserting that the internal engine produced the correct result');

        $rc2->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
        if ($rc2->getEngine() == CRYPT_ENGINE_MCRYPT) {
            $mcrypt = $rc2->encrypt('d');
            $this->assertEquals($result, $mcrypt, 'Failed asserting that the mcrypt engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize mcrypt engine');
        }

        $rc2->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
        if ($rc2->getEngine() == CRYPT_ENGINE_OPENSSL) {
            $openssl = $rc2->encrypt('d');
            $this->assertEquals($result, $openssl, 'Failed asserting that the OpenSSL engine produced the correct result');
        } else {
            self::markTestSkipped('Unable to initialize OpenSSL engine');
        }
    }

    /**
     * @dataProvider engineVectors
     */
    public function testVectors($engine, $engineName, $key, $keyLen, $plaintext, $ciphertext)
    {
        $rc2 = new Crypt_RC2();
        $rc2->disablePadding();
        $rc2->setKeyLength($keyLen);
        $rc2->setKey(pack('H*', $key)); // could also do $rc2->setKey(pack('H*', $key), $keyLen)
        if (!$rc2->isValidEngine($engine)) {
            self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
        }
        $rc2->setPreferredEngine($engine);

        $result = bin2hex($rc2->encrypt(pack('H*', $plaintext)));
        $this->assertEquals($result, $ciphertext, "Failed asserting that $plaintext yielded expected output in $engineName engine");

        $result = bin2hex($rc2->decrypt(pack('H*', $ciphertext)));
        $this->assertEquals($result, $plaintext, "Failed asserting that decrypted result yielded $plaintext as a result in $engineName engine");
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/RC4Test.php000066400000000000000000000371031354156543400207130ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/RC4.php';

class Unit_Crypt_RC4Test extends PhpseclibTestCase
{
    public function engineVectors()
    {
        $engines = array(
            CRYPT_ENGINE_INTERNAL => 'internal',
            CRYPT_ENGINE_MCRYPT => 'mcrypt',
            CRYPT_ENGINE_OPENSSL => 'OpenSSL',
        );
        // tests from https://tools.ietf.org/html/rfc6229
        $tests = array(
            array(
                'key' => pack('H*', '0102030405'), // 40-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => 'b2396305f03dc027ccc3524a0a1118a8'),
                    array('offset' =>   16, 'result' => '6982944f18fc82d589c403a47a0d0919'),
                    array('offset' =>  240, 'result' => '28cb1132c96ce286421dcaadb8b69eae'),
                    array('offset' =>  256, 'result' => '1cfcf62b03eddb641d77dfcf7f8d8c93'),
                    array('offset' =>  496, 'result' => '42b7d0cdd918a8a33dd51781c81f4041'),
                    array('offset' =>  512, 'result' => '6459844432a7da923cfb3eb4980661f6'),
                    array('offset' =>  752, 'result' => 'ec10327bde2beefd18f9277680457e22'),
                    array('offset' =>  768, 'result' => 'eb62638d4f0ba1fe9fca20e05bf8ff2b'),
                    array('offset' => 1008, 'result' => '45129048e6a0ed0b56b490338f078da5'),
                    array('offset' => 1024, 'result' => '30abbcc7c20b01609f23ee2d5f6bb7df'),
                    array('offset' => 1520, 'result' => '3294f744d8f9790507e70f62e5bbceea'),
                    array('offset' => 1536, 'result' => 'd8729db41882259bee4f825325f5a130'),
                    array('offset' => 2032, 'result' => '1eb14a0c13b3bf47fa2a0ba93ad45b8b'),
                    array('offset' => 2048, 'result' => 'cc582f8ba9f265e2b1be9112e975d2d7'),
                    array('offset' => 3056, 'result' => 'f2e30f9bd102ecbf75aaade9bc35c43c'),
                    array('offset' => 3072, 'result' => 'ec0e11c479dc329dc8da7968fe965681'),
                    array('offset' => 4080, 'result' => '068326a2118416d21f9d04b2cd1ca050'),
                    array('offset' => 4096, 'result' => 'ff25b58995996707e51fbdf08b34d875')
                )
            ),
            array(
                'key' => pack('H*', '01020304050607'), // 56-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => '293f02d47f37c9b633f2af5285feb46b'),
                    array('offset' =>   16, 'result' => 'e620f1390d19bd84e2e0fd752031afc1'),
                    array('offset' =>  240, 'result' => '914f02531c9218810df60f67e338154c'),
                    array('offset' =>  256, 'result' => 'd0fdb583073ce85ab83917740ec011d5'),
                    array('offset' =>  496, 'result' => '75f81411e871cffa70b90c74c592e454'),
                    array('offset' =>  512, 'result' => '0bb87202938dad609e87a5a1b079e5e4'),
                    array('offset' =>  752, 'result' => 'c2911246b612e7e7b903dfeda1dad866'),
                    array('offset' =>  768, 'result' => '32828f91502b6291368de8081de36fc2'),
                    array('offset' => 1008, 'result' => 'f3b9a7e3b297bf9ad804512f9063eff1'),
                    array('offset' => 1024, 'result' => '8ecb67a9ba1f55a5a067e2b026a3676f'),
                    array('offset' => 1520, 'result' => 'd2aa902bd42d0d7cfd340cd45810529f'),
                    array('offset' => 1536, 'result' => '78b272c96e42eab4c60bd914e39d06e3'),
                    array('offset' => 2032, 'result' => 'f4332fd31a079396ee3cee3f2a4ff049'),
                    array('offset' => 2048, 'result' => '05459781d41fda7f30c1be7e1246c623'),
                    array('offset' => 3056, 'result' => 'adfd3868b8e51485d5e610017e3dd609'),
                    array('offset' => 3072, 'result' => 'ad26581c0c5be45f4cea01db2f3805d5'),
                    array('offset' => 4080, 'result' => 'f3172ceffc3b3d997c85ccd5af1a950c'),
                    array('offset' => 4096, 'result' => 'e74b0b9731227fd37c0ec08a47ddd8b8')
                )
            ),
            array(
                'key' => pack('H*', '0102030405060708'), // 64-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => '97ab8a1bf0afb96132f2f67258da15a8'),
                    array('offset' =>   16, 'result' => '8263efdb45c4a18684ef87e6b19e5b09'),
                    array('offset' =>  240, 'result' => '9636ebc9841926f4f7d1f362bddf6e18'),
                    array('offset' =>  256, 'result' => 'd0a990ff2c05fef5b90373c9ff4b870a'),
                    array('offset' =>  496, 'result' => '73239f1db7f41d80b643c0c52518ec63'),
                    array('offset' =>  512, 'result' => '163b319923a6bdb4527c626126703c0f'),
                    array('offset' =>  752, 'result' => '49d6c8af0f97144a87df21d91472f966'),
                    array('offset' =>  768, 'result' => '44173a103b6616c5d5ad1cee40c863d0'),
                    array('offset' => 1008, 'result' => '273c9c4b27f322e4e716ef53a47de7a4'),
                    array('offset' => 1024, 'result' => 'c6d0e7b226259fa9023490b26167ad1d'),
                    array('offset' => 1520, 'result' => '1fe8986713f07c3d9ae1c163ff8cf9d3'),
                    array('offset' => 1536, 'result' => '8369e1a965610be887fbd0c79162aafb'),
                    array('offset' => 2032, 'result' => '0a0127abb44484b9fbef5abcae1b579f'),
                    array('offset' => 2048, 'result' => 'c2cdadc6402e8ee866e1f37bdb47e42c'),
                    array('offset' => 3056, 'result' => '26b51ea37df8e1d6f76fc3b66a7429b3'),
                    array('offset' => 3072, 'result' => 'bc7683205d4f443dc1f29dda3315c87b'),
                    array('offset' => 4080, 'result' => 'd5fa5a3469d29aaaf83d23589db8c85b'),
                    array('offset' => 4096, 'result' => '3fb46e2c8f0f068edce8cdcd7dfc5862')
                )
            ),
            array(
                'key' => pack('H*', '0102030405060708090a'), // 80-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => 'ede3b04643e586cc907dc21851709902'),
                    array('offset' =>   16, 'result' => '03516ba78f413beb223aa5d4d2df6711'),
                    array('offset' =>  240, 'result' => '3cfd6cb58ee0fdde640176ad0000044d'),
                    array('offset' =>  256, 'result' => '48532b21fb6079c9114c0ffd9c04a1ad'),
                    array('offset' =>  496, 'result' => '3e8cea98017109979084b1ef92f99d86'),
                    array('offset' =>  512, 'result' => 'e20fb49bdb337ee48b8d8dc0f4afeffe'),
                    array('offset' =>  752, 'result' => '5c2521eacd7966f15e056544bea0d315'),
                    array('offset' =>  768, 'result' => 'e067a7031931a246a6c3875d2f678acb'),
                    array('offset' => 1008, 'result' => 'a64f70af88ae56b6f87581c0e23e6b08'),
                    array('offset' => 1024, 'result' => 'f449031de312814ec6f319291f4a0516'),
                    array('offset' => 1520, 'result' => 'bdae85924b3cb1d0a2e33a30c6d79599'),
                    array('offset' => 1536, 'result' => '8a0feddbac865a09bcd127fb562ed60a'),
                    array('offset' => 2032, 'result' => 'b55a0a5b51a12a8be34899c3e047511a'),
                    array('offset' => 2048, 'result' => 'd9a09cea3ce75fe39698070317a71339'),
                    array('offset' => 3056, 'result' => '552225ed1177f44584ac8cfa6c4eb5fc'),
                    array('offset' => 3072, 'result' => '7e82cbabfc95381b080998442129c2f8'),
                    array('offset' => 4080, 'result' => '1f135ed14ce60a91369d2322bef25e3c'),
                    array('offset' => 4096, 'result' => '08b6be45124a43e2eb77953f84dc8553')
                )
            ),
            array(
                'key' => pack('H*', '0102030405060708090a0b0c0d0e0f10'), // 128-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => '9ac7cc9a609d1ef7b2932899cde41b97'),
                    array('offset' =>   16, 'result' => '5248c4959014126a6e8a84f11d1a9e1c'),
                    array('offset' =>  240, 'result' => '065902e4b620f6cc36c8589f66432f2b'),
                    array('offset' =>  256, 'result' => 'd39d566bc6bce3010768151549f3873f'),
                    array('offset' =>  496, 'result' => 'b6d1e6c4a5e4771cad79538df295fb11'),
                    array('offset' =>  512, 'result' => 'c68c1d5c559a974123df1dbc52a43b89'),
                    array('offset' =>  752, 'result' => 'c5ecf88de897fd57fed301701b82a259'),
                    array('offset' =>  768, 'result' => 'eccbe13de1fcc91c11a0b26c0bc8fa4d'),
                    array('offset' => 1008, 'result' => 'e7a72574f8782ae26aabcf9ebcd66065'),
                    array('offset' => 1024, 'result' => 'bdf0324e6083dcc6d3cedd3ca8c53c16'),
                    array('offset' => 1520, 'result' => 'b40110c4190b5622a96116b0017ed297'),
                    array('offset' => 1536, 'result' => 'ffa0b514647ec04f6306b892ae661181'),
                    array('offset' => 2032, 'result' => 'd03d1bc03cd33d70dff9fa5d71963ebd'),
                    array('offset' => 2048, 'result' => '8a44126411eaa78bd51e8d87a8879bf5'),
                    array('offset' => 3056, 'result' => 'fabeb76028ade2d0e48722e46c4615a3'),
                    array('offset' => 3072, 'result' => 'c05d88abd50357f935a63c59ee537623'),
                    array('offset' => 4080, 'result' => 'ff38265c1642c1abe8d3c2fe5e572bf8'),
                    array('offset' => 4096, 'result' => 'a36a4c301ae8ac13610ccbc12256cacc')
                )
            ),
            array(
                'key' => pack('H*', '0102030405060708090a0b0c0d0e0f101112131415161718'), // 192-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => '0595e57fe5f0bb3c706edac8a4b2db11'),
                    array('offset' =>   16, 'result' => 'dfde31344a1af769c74f070aee9e2326'),
                    array('offset' =>  240, 'result' => 'b06b9b1e195d13d8f4a7995c4553ac05'),
                    array('offset' =>  256, 'result' => '6bd2378ec341c9a42f37ba79f88a32ff'),
                    array('offset' =>  496, 'result' => 'e70bce1df7645adb5d2c4130215c3522'),
                    array('offset' =>  512, 'result' => '9a5730c7fcb4c9af51ffda89c7f1ad22'),
                    array('offset' =>  752, 'result' => '0485055fd4f6f0d963ef5ab9a5476982'),
                    array('offset' =>  768, 'result' => '591fc66bcda10e452b03d4551f6b62ac'),
                    array('offset' => 1008, 'result' => '2753cc83988afa3e1688a1d3b42c9a02'),
                    array('offset' => 1024, 'result' => '93610d523d1d3f0062b3c2a3bbc7c7f0'),
                    array('offset' => 1520, 'result' => '96c248610aadedfeaf8978c03de8205a'),
                    array('offset' => 1536, 'result' => '0e317b3d1c73b9e9a4688f296d133a19'),
                    array('offset' => 2032, 'result' => 'bdf0e6c3cca5b5b9d533b69c56ada120'),
                    array('offset' => 2048, 'result' => '88a218b6e2ece1e6246d44c759d19b10'),
                    array('offset' => 3056, 'result' => '6866397e95c140534f94263421006e40'),
                    array('offset' => 3072, 'result' => '32cb0a1e9542c6b3b8b398abc3b0f1d5'),
                    array('offset' => 4080, 'result' => '29a0b8aed54a132324c62e423f54b4c8'),
                    array('offset' => 4096, 'result' => '3cb0f3b5020a98b82af9fe154484a168')
                )
            ),
            array(
                'key' => pack('H*', '0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20'), // 256-bit key
                'output' => array(
                    array('offset' =>    0, 'result' => 'eaa6bd25880bf93d3f5d1e4ca2611d91'),
                    array('offset' =>   16, 'result' => 'cfa45c9f7e714b54bdfa80027cb14380'),
                    array('offset' =>  240, 'result' => '114ae344ded71b35f2e60febad727fd8'),
                    array('offset' =>  256, 'result' => '02e1e7056b0f623900496422943e97b6'),
                    array('offset' =>  496, 'result' => '91cb93c787964e10d9527d999c6f936b'),
                    array('offset' =>  512, 'result' => '49b18b42f8e8367cbeb5ef104ba1c7cd'),
                    array('offset' =>  752, 'result' => '87084b3ba700bade955610672745b374'),
                    array('offset' =>  768, 'result' => 'e7a7b9e9ec540d5ff43bdb12792d1b35'),
                    array('offset' => 1008, 'result' => 'c799b596738f6b018c76c74b1759bd90'),
                    array('offset' => 1024, 'result' => '7fec5bfd9f9b89ce6548309092d7e958'),
                    array('offset' => 1520, 'result' => '40f250b26d1f096a4afd4c340a588815'),
                    array('offset' => 1536, 'result' => '3e34135c79db010200767651cf263073'),
                    array('offset' => 2032, 'result' => 'f656abccf88dd827027b2ce917d464ec'),
                    array('offset' => 2048, 'result' => '18b62503bfbc077fbabb98f20d98ab34'),
                    array('offset' => 3056, 'result' => '8aed95ee5b0dcbfbef4eb21d3a3f52f9'),
                    array('offset' => 3072, 'result' => '625a1ab00ee39a5327346bddb01a9c18'),
                    array('offset' => 4080, 'result' => 'a13a7c79c7e119b5ab0296ab28c300b9'),
                    array('offset' => 4096, 'result' => 'f3e4c0a2e02d1d01f7f0a74618af2b48')
                )
            )
        );

        $result = array();

        foreach ($engines as $engine => $engineName) {
            foreach ($tests as $test) {
                foreach ($test['output'] as $output) {
                    $result[] = array($engine, $engineName, $test['key'], $output['offset'], $output['result']);
                }
            }
        }

        return $result;
    }

    /**
     * @dataProvider engineVectors
     */
    public function testVectors($engine, $engineName, $key, $offset, $expected)
    {
        $rc4 = new Crypt_RC4();
        $rc4->setPreferredEngine($engine);
        $rc4->setKey($key);
        if ($rc4->getEngine() != $engine) {
            self::markTestSkipped('Unable to initialize ' . $engineName . ' engine for ' . (strlen($key) * 8) . '-bit key');
        }
        $result = $rc4->encrypt(str_repeat("\0", $offset + 16));
        $this->assertEquals(bin2hex(substr($result, -16)), $expected, "Failed asserting that key $key yielded expected output at offset $offset in $engineName engine");
    }

    public function testKeySizes()
    {
        $objects = $engines = array();
        $temp = new Crypt_RC4(CRYPT_MODE_CTR);
        $temp->setPreferredEngine(CRYPT_ENGINE_INTERNAL);
        $objects[] = $temp;
        $engines[] = 'internal';

        if ($temp->isValidEngine(CRYPT_ENGINE_MCRYPT)) {
            $temp = new Crypt_RC4(CRYPT_MODE_CTR);
            $temp->setPreferredEngine(CRYPT_ENGINE_MCRYPT);
            $objects[] = $temp;
            $engines[] = 'mcrypt';
        }

        if ($temp->isValidEngine(CRYPT_ENGINE_OPENSSL)) {
            $temp = new Crypt_RC4(CRYPT_MODE_CTR);
            $temp->setPreferredEngine(CRYPT_ENGINE_OPENSSL);
            $objects[] = $temp;
            $engines[] = 'OpenSSL';
        }

        if (count($objects) < 2) {
            self::markTestSkipped('Unable to initialize two or more engines');
        }

        $plaintext = str_repeat('.', 100);

        for ($keyLen = 5; $keyLen <= 256; $keyLen++) {
            $key = crypt_random_string($keyLen);
            $objects[0]->setKey($key);
            $ref = $objects[0]->encrypt($plaintext);
            for ($i = 1; $i < count($objects); $i++) {
                $objects[$i]->setKey($key);
                $this->assertEquals($ref, $objects[$i]->encrypt($plaintext), "Failed asserting that {$engines[$i]} yields the same output as the internal engine with a key size of $keyLen");
            }
        }
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/RSA/000077500000000000000000000000001354156543400173735ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Crypt/RSA/LoadKeyTest.php000066400000000000000000000525741354156543400223110ustar00rootroot00000000000000
 * @copyright 2013 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/RSA.php' ;

class Unit_Crypt_RSA_LoadKeyTest extends PhpseclibTestCase
{
    public function testBadKey()
    {
        $rsa = new Crypt_RSA();

        $key = 'zzzzzzzzzzzzzz';

        $this->assertFalse($rsa->loadKey($key));
    }

    public function testPKCS1Key()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testPKCS1SpacesKey()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';
        $key = str_replace(array("\r", "\n", "\r\n"), ' ', $key);

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testPKCS1NoHeaderKey()
    {
        $rsa = new Crypt_RSA();

        $key = 'MIICXAIBAAKBgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUp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';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testPKCS1NoWhitespaceNoHeaderKey()
    {
        $rsa = new Crypt_RSA();

        $key = 'MIICXAIBAAKBgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUp' .
               'wmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ5' .
               '1s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZwIDAQABAoGAFijko56+qGyN8M0RVyaRAXz++xTqHBLh' .
               '3tx4VgMtrQ+WEgCjhoTwo23KMBAuJGSYnRmoBZM3lMfTKevIkAidPExvYCdm5dYq3XToLkkLv5L2' .
               'pIIVOFMDG+KESnAFV7l2c+cnzRMW0+b6f8mR1CJzZuxVLL6Q02fvLi55/mbSYxECQQDeAw6fiIQX' .
               'GukBI4eMZZt4nscy2o12KyYner3VpoeE+Np2q+Z3pvAMd/aNzQ/W9WaI+NRfcxUJrmfPwIGm63il' .
               'AkEAxCL5HQb2bQr4ByorcMWm/hEP2MZzROV73yF41hPsRC9m66KrheO9HPTJuo3/9s5p+sqGxOlF' .
               'L0NDt4SkosjgGwJAFklyR1uZ/wPJjj611cdBcztlPdqoxssQGnh85BzCj/u3WqBpE2vjvyyvyI5k' .
               'X6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl' .
               'U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ' .
               '37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testRawPKCS1Key()
    {
        $rsa = new Crypt_RSA();

        $key = 'MIICXAIBAAKBgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUp' .
               'wmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ5' .
               '1s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZwIDAQABAoGAFijko56+qGyN8M0RVyaRAXz++xTqHBLh' .
               '3tx4VgMtrQ+WEgCjhoTwo23KMBAuJGSYnRmoBZM3lMfTKevIkAidPExvYCdm5dYq3XToLkkLv5L2' .
               'pIIVOFMDG+KESnAFV7l2c+cnzRMW0+b6f8mR1CJzZuxVLL6Q02fvLi55/mbSYxECQQDeAw6fiIQX' .
               'GukBI4eMZZt4nscy2o12KyYner3VpoeE+Np2q+Z3pvAMd/aNzQ/W9WaI+NRfcxUJrmfPwIGm63il' .
               'AkEAxCL5HQb2bQr4ByorcMWm/hEP2MZzROV73yF41hPsRC9m66KrheO9HPTJuo3/9s5p+sqGxOlF' .
               'L0NDt4SkosjgGwJAFklyR1uZ/wPJjj611cdBcztlPdqoxssQGnh85BzCj/u3WqBpE2vjvyyvyI5k' .
               'X6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl' .
               'U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ' .
               '37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=';
        $key = base64_decode($key);

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testLoadPKCS8PrivateKey()
    {
        $rsa = new Crypt_RSA();
        $rsa->setPassword('password');

        $key = '-----BEGIN ENCRYPTED PRIVATE KEY-----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-----END ENCRYPTED PRIVATE KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPrivateKey());
    }

    public function testSavePKCS8PrivateKey()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';
        $rsa->setPassword('password');

        $this->assertTrue($rsa->loadKey($key));

        $key = $rsa->getPrivateKey(CRYPT_RSA_PRIVATE_FORMAT_PKCS8);
        $this->assertInternalType('string', $key);

        $this->assertTrue($rsa->loadKey($key));
    }

    public function testPubKey1()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PUBLIC KEY-----
MIIBCgKCAQEA61BjmfXGEvWmegnBGSuS+rU9soUg2FnODva32D1AqhwdziwHINFa
D1MVlcrYG6XRKfkcxnaXGfFDWHLEvNBSEVCgJjtHAGZIm5GL/KA86KDp/CwDFMSw
luowcXwDwoyinmeOY9eKyh6aY72xJh7noLBBq1N0bWi1e2i+83txOCg4yV2oVXhB
o8pYEJ8LT3el6Smxol3C1oFMVdwPgc0vTl25XucMcG/ALE/KNY6pqC2AQ6R2ERlV
gPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeulmCpGSynXNcpZ/06+vofGi/2MlpQZNhH
Ao8eayMp6FcvNucIpUndo1X8dKMv3Y26ZQIDAQAB
-----END RSA PUBLIC KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPublicKey());
        $this->assertFalse($rsa->getPrivateKey());
    }

    public function testPubKey2()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA61BjmfXGEvWmegnBGSuS
+rU9soUg2FnODva32D1AqhwdziwHINFaD1MVlcrYG6XRKfkcxnaXGfFDWHLEvNBS
EVCgJjtHAGZIm5GL/KA86KDp/CwDFMSwluowcXwDwoyinmeOY9eKyh6aY72xJh7n
oLBBq1N0bWi1e2i+83txOCg4yV2oVXhBo8pYEJ8LT3el6Smxol3C1oFMVdwPgc0v
Tl25XucMcG/ALE/KNY6pqC2AQ6R2ERlVgPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeu
lmCpGSynXNcpZ/06+vofGi/2MlpQZNhHAo8eayMp6FcvNucIpUndo1X8dKMv3Y26
ZQIDAQAB
-----END PUBLIC KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPublicKey());
        $this->assertFalse($rsa->getPrivateKey());
    }

    public function testSSHPubKey()
    {
        $rsa = new Crypt_RSA();

        $key = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4e' .
               'CZ0FPqri0cb2JZfXJ/DgYSF6vUpwmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMS' .
               'GkVb1/3j+skZ6UtW+5u09lHNsj6tQ51s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZw== ' .
               'phpseclib-generated-key';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPublicKey());
        $this->assertFalse($rsa->getPrivateKey());
    }


    public function testSSHPubKeyFingerprint()
    {
        $rsa = new Crypt_RSA();
        $key = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD9K+ebJRMN10kGanhi6kDz6EYFqZttZWZh0'.
              'YoEbIbbere9N2Yvfc7oIoCTHYowhXND9WSJaIs1E4bx0085CZnofWaqf4NbZTzAh18iZup08ec'.
              'COB5gJVS1efpgVSviDF2L7jxMsBVoOBfqsmA8m0RwDDVezyWvw4y+STSuVzu2jI8EfwN7ZFGC6'.
              'Yo8m/Z94qIGzqPYGKJLuCeidB0TnUE0ZtzOJTiOc/WoTm/NOpCdfQZEJggd1MOTi+QUnqRu4Wu'.
              'b6wYtY/q/WtUFr3nK+x0lgOtokhnJfRR/6fnmC1CztPnIT4BWK81VGKWONAxuhMyQ5XChyu6S9'.
              'mWG5tUlUI/5';
        $this->assertTrue($rsa->loadKey($key));
        $this->assertSame($rsa->getPublicKeyFingerprint('md5'), 'bd:2c:2f:31:b9:ef:b8:f8:ad:fc:40:a6:94:4f:28:82');
        $this->assertSame($rsa->getPublicKeyFingerprint('sha256'), 'N9sV2uSNZEe8TITODku0pRI27l+Zk0IY0TrRTw3ozwM');
    }

    public function testSetPrivate()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PUBLIC KEY-----
MIIBCgKCAQEA61BjmfXGEvWmegnBGSuS+rU9soUg2FnODva32D1AqhwdziwHINFa
D1MVlcrYG6XRKfkcxnaXGfFDWHLEvNBSEVCgJjtHAGZIm5GL/KA86KDp/CwDFMSw
luowcXwDwoyinmeOY9eKyh6aY72xJh7noLBBq1N0bWi1e2i+83txOCg4yV2oVXhB
o8pYEJ8LT3el6Smxol3C1oFMVdwPgc0vTl25XucMcG/ALE/KNY6pqC2AQ6R2ERlV
gPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeulmCpGSynXNcpZ/06+vofGi/2MlpQZNhH
Ao8eayMp6FcvNucIpUndo1X8dKMv3Y26ZQIDAQAB
-----END RSA PUBLIC KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertTrue($rsa->setPrivateKey());
        $this->assertGreaterThanOrEqual(1, strlen("$rsa"));
        $this->assertFalse($rsa->getPublicKey());
    }

    /**
     * make phpseclib generated XML keys be unsigned. this may need to be reverted
     * if it is later learned that XML keys are, in fact, supposed to be signed
     * @group github468
     */
    public function testUnsignedXML()
    {
        $rsa = new Crypt_RSA();

        $key = '
  v5OxcEgxPUfa701NpxnScCmlRkbwSGBiTWobHkIWZEB+AlRTHaVoZg/D8l6YzR7VdQidG6gF+nuUMjY75dBXgY/XcyVq0Hccf1jTfgARuNuq4GGG3hnCJVi2QsOgcf9R7TeXn+p1RKIhjQoWCiEQeEBTotNbJhcabNcPGSEJw+s=
  AQAB
';

        $rsa->loadKey($key);
        $rsa->setPublicKey();
        $newkey = $rsa->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_XML);

        $this->assertSame(preg_replace('#\s#', '', $key), preg_replace('#\s#', '', $newkey));
    }

    /**
     * @group github468
     */
    public function testSignedPKCS1()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/k7FwSDE9R9rvTU2nGdJwKaVG
RvBIYGJNahseQhZkQH4CVFMdpWhmD8PyXpjNHtV1CJ0bqAX6e5QyNjvl0FeBj9dz
JWrQdxx/WNN+ABG426rgYYbeGcIlWLZCw6Bx/1HtN5ef6nVEoiGNChYKIRB4QFOi
01smFxps1w8ZIQnD6wIDAQAB
-----END PUBLIC KEY-----';

        $rsa->loadKey($key);
        $rsa->setPublicKey();
        $newkey = $rsa->getPublicKey();

        $this->assertSame(preg_replace('#\s#', '', $key), preg_replace('#\s#', '', $newkey));
    }

    /**
     * @group github861
     */
    public function testPKCS8Only()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----';

        $result = $rsa->loadKey($key, CRYPT_RSA_PRIVATE_FORMAT_PKCS8);

        $this->assertTrue($result);
    }

    /**
     * @group github960
     */
    public function testSetLoad()
    {
        $key = 'PuTTY-User-Key-File-2: ssh-rsa
Encryption: aes256-cbc
Comment: phpseclib-generated-key
Public-Lines: 4
AAAAB3NzaC1yc2EAAAADAQABAAAAgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4
eCZ0FPqri0cb2JZfXJ/DgYSF6vUpwmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RK
NUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ51s1SPrCBkedbNf0Tp0GbMJDy
R4e9T04ZZw==
Private-Lines: 8
llx04QMegql0/nE5RvcJSrGrodxt6ytuv/JX2caeZBUyQwQc2WBNYagLHyHPM9jI
9OUWz59FLhjFXZMDNMoUXxVmjwQpOAaVPYNxxFM9AF6/NXFji64K7huD9n4A+kLn
sHwMLWPR5a/tZA0r05DZNz9ULA3mQu7Hz4EQ8ifu3uTPJuTmL51x6RmudYKysb20
fM8VzC3ukvzzRh0pujUVTr/yQdmciASVFnZlt4xQy+ZEOVUAOfwjd//AFfXTvk6x
7A45rNlU/uicHwLgoY1APvRHCFxw7F+uVW5L4mSX7NNzqBKkZ+1qpQTAfQvIfEIb
444+CXsgIyOpqt6VxJH2u6elAtE1wau3YaFR8Alm8m97rFYzRi3oDP5NZYkTCWSV
EOpSeghXSs7IilJu8I6/sB1w5dakdeBSFkIynrlFXkO0uUw+QJJWjxY8SypzgIuP
DzduF6XsQrCyo6dnIpGQCQ==
Private-MAC: 35134b7434bf828b21404099861d455e660e8740';

        $rsa = new Crypt_RSA();
        $rsa->setPrivateKey($key);
        $rsa->loadKey($key);

        $rsa = new Crypt_RSA();
        $rsa->loadKey($key);
        $rsa->setPrivateKey();
        $rsa->loadKey($rsa);
    }

    /**
     * @group github980
     */
    public function testZeroComponents()
    {
        $key = '-----BEGIN RSA PRIVATE KEY-----
MIGaAgEAAkEAt5yrcHAAjhglnCEn6yecMWPeUXcMyo0+itXrLlkpcKIIyqPw546b
GThhlb1ppX1ySX/OUA4jSakHekNP5eWPawIBAAJAW6/aVD05qbsZHMvZuS2Aa5Fp
NNj0BDlf38hOtkhDzz/hkYb+EBYLLvldhgsD0OvRNy8yhz7EjaUqLCB0juIN4QIB
AAIBAAIBAAIBAAIBAA==
-----END RSA PRIVATE KEY-----';

        $rsa = new Crypt_RSA();
        $rsa->loadKey($key);
        $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
        $rsa->setHash('md5');
        $rsa->setMGFHash('md5');

        $rsa->sign('zzzz');
    }

    public function testGoodBad()
    {
        $rsa = new Crypt_RSA();

        $key = '-----BEGIN RSA PUBLIC KEY-----
MIIBCgKCAQEA61BjmfXGEvWmegnBGSuS+rU9soUg2FnODva32D1AqhwdziwHINFa
D1MVlcrYG6XRKfkcxnaXGfFDWHLEvNBSEVCgJjtHAGZIm5GL/KA86KDp/CwDFMSw
luowcXwDwoyinmeOY9eKyh6aY72xJh7noLBBq1N0bWi1e2i+83txOCg4yV2oVXhB
o8pYEJ8LT3el6Smxol3C1oFMVdwPgc0vTl25XucMcG/ALE/KNY6pqC2AQ6R2ERlV
gPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeulmCpGSynXNcpZ/06+vofGi/2MlpQZNhH
Ao8eayMp6FcvNucIpUndo1X8dKMv3Y26ZQIDAQAB
-----END RSA PUBLIC KEY-----';

        $this->assertTrue($rsa->loadKey($key));
        $this->assertInternalType('string', $rsa->getPublicKey());
        $this->assertFalse($rsa->loadKey('zzz'));
        $this->assertFalse($rsa->getPublicKey());
    }

    public function testOpenSSHPrivate()
    {
        $key = '-----BEGIN OPENSSH PRIVATE KEY-----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-----END OPENSSH PRIVATE KEY-----';

        $rsa = new Crypt_RSA();
        $this->assertTrue($rsa->loadKey($key));

        $key = $rsa->getPrivateKey(CRYPT_RSA_PRIVATE_FORMAT_OPENSSH);
        $rsa = new Crypt_RSA();
        $this->assertTrue($rsa->loadKey($key));

        $sig = $rsa->sign('zzz');

        $key = 'ssh-rsa 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 root@vagrant';

        $rsa = new Crypt_RSA();
        $this->assertTrue($rsa->loadKey($key));

        $this->assertTrue($rsa->verify('zzz', $sig));
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/RSA/ModeTest.php000066400000000000000000000105421354156543400216320ustar00rootroot00000000000000
 * @copyright 2013 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/RSA.php' ;

class Unit_Crypt_RSA_ModeTest extends PhpseclibTestCase
{
    public function testEncryptionModeNone()
    {
        $plaintext = 'a';

        $rsa = new Crypt_RSA();

        $privatekey = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';
        $rsa->loadKey($privatekey);
        $rsa->loadKey($rsa->getPublicKey());

        $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_NONE);
        $expected = '105b92f59a87a8ad4da52c128b8c99491790ef5a54770119e0819060032fb9e772ed6772828329567f3d7e9472154c1530f8156ba7fd732f52ca1c06' .
            '5a3f5ed8a96c442e4662e0464c97f133aed31262170201993085a589565d67cc9e727e0d087e3b225c8965203b271e38a499c92fc0d6502297eca712' .
            '4d04bd467f6f1e7c';
        $expected = pack('H*', $expected);
        $result = $rsa->encrypt($plaintext);

        $this->assertEquals($result, $expected);

        $rsa->loadKey($privatekey);
        $this->assertEquals(trim($rsa->decrypt($result), "\0"), $plaintext);
    }

    /**
     * @group github768
     */
    public function testPSSSigs()
    {
        $rsa = new Crypt_RSA();
        $rsa->loadKey('-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqGKukO1De7zhZj6+H0qtjTkVx
wTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUpwmJG8wVQZKjeGcjDOL5UlsuusFnc
CzWBQ7RKNUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ51s1SPrCBkedbNf0T
p0GbMJDyR4e9T04ZZwIDAQAB
-----END PUBLIC KEY-----');

        $sig = pack('H*', '1bd29a1d704a906cd7f726370ce1c63d8fb7b9a620871a05f3141a311c0d6e75fefb5d36dfb50d3ea2d37cd67992471419bfadd35da6e13b494' .
            '058ddc9b568d4cfea13ddc3c62b86a6256f5f296980d1131d3eaec6089069a3de79983f73eae20198a18721338b4a66e9cfe80e4f8e4fcef7a5bead5cbb' .
            'b8ac4c76adffbc178c');

        $this->assertTrue($rsa->verify('zzzz', $sig));
    }

    public function testZeroLengthSalt()
    {
        $plaintext = 'a';

        $rsa = new Crypt_RSA();

        $privatekey = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';
        $rsa->loadKey($privatekey);
        $rsa->setSaltLength(0);

        // Check we generate the correct signature.
        $sig = pack('H*', '0ddfc93548e21d015c0a289a640b3b79aecfdfae045f583c5925b91cc5c399bba181616ad6ae20d9662d966f0eb2fddb550f4733268e34d640f4c9dadcaf25b3c82c42130a5081c6ebad7883331c65b25b6a37ffa7c4233a468dae56180787e2718ed87c48d8d50b72f5850e4a40963b4f36710be250ecef6fe0bb91249261a3');
        $this->assertEquals($sig, $rsa->sign($plaintext));

        // Check we can verify the signature correctly.
        $rsa->loadKey($rsa->getPublicKey());
        $this->assertTrue($rsa->verify($plaintext, $sig));
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/RandomTest.php000066400000000000000000000030101354156543400215310ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Crypt_RandomTest extends PhpseclibTestCase
{
    public function stringLengthData()
    {
        return array_map(array($this, 'wrap'), array(
            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 17, 19, 20, 23, 29, 31, 37,
            41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 111, 128, 1000,
            1024, 10000, 12345, 100000, 123456
        ));
    }

    /** @dataProvider stringLengthData */
    public function testStringLength($length)
    {
        $this->assertSame(
            $length,
            strlen(crypt_random_string($length)),
            'Failed asserting that a string of expected length was generated.'
        );
    }

    /**
     * Takes a set of random values of length 128 bits and asserts all taken
     * values are unique.
     */
    public function testStringUniqueness()
    {
        $values = array();
        for ($i = 0; $i < 10000; ++$i) {
            $rand = crypt_random_string(16);
            $this->assertSame(16, strlen($rand));
            $this->assertArrayNotHasKey(
                $rand,
                $values,
                'Failed asserting that generated value does not exist in set.'
            );
            $values[$rand] = true;
        }
    }

    protected function wrap($x)
    {
        // array() is not a function, but $this->wrap() is.
        return array($x);
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/TripleDESTest.php000066400000000000000000000255701354156543400221230ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/TripleDES.php';

class Unit_Crypt_TripleDESTest extends PhpseclibTestCase
{
    var $engines = array(
        CRYPT_ENGINE_INTERNAL => 'internal',
        CRYPT_ENGINE_MCRYPT => 'mcrypt',
        CRYPT_ENGINE_OPENSSL => 'OpenSSL',
    );

    public function engineVectors()
    {
        // tests from http://csrc.nist.gov/publications/nistpubs/800-20/800-20.pdf#page=273
        $tests = array(
            // Table A.1
            // key, plaintext, ciphertext
            array(str_repeat("\x01", 24), pack('H*', '8000000000000000'), pack('H*', '95F8A5E5DD31D900')),
            array(str_repeat("\x01", 24), pack('H*', '4000000000000000'), pack('H*', 'DD7F121CA5015619')),
            array(str_repeat("\x01", 24), pack('H*', '2000000000000000'), pack('H*', '2E8653104F3834EA')),
            array(str_repeat("\x01", 24), pack('H*', '1000000000000000'), pack('H*', '4BD388FF6CD81D4F')),
            array(str_repeat("\x01", 24), pack('H*', '0800000000000000'), pack('H*', '20B9E767B2FB1456')),
            array(str_repeat("\x01", 24), pack('H*', '0400000000000000'), pack('H*', '55579380D77138EF')),
            array(str_repeat("\x01", 24), pack('H*', '0200000000000000'), pack('H*', '6CC5DEFAAF04512F')),
            array(str_repeat("\x01", 24), pack('H*', '0100000000000000'), pack('H*', '0D9F279BA5D87260')),
            array(str_repeat("\x01", 24), pack('H*', '0080000000000000'), pack('H*', 'D9031B0271BD5A0A')),
            array(str_repeat("\x01", 24), pack('H*', '0040000000000000'), pack('H*', '424250B37C3DD951')),
            array(str_repeat("\x01", 24), pack('H*', '0020000000000000'), pack('H*', 'B8061B7ECD9A21E5')),
            array(str_repeat("\x01", 24), pack('H*', '0010000000000000'), pack('H*', 'F15D0F286B65BD28')),
            array(str_repeat("\x01", 24), pack('H*', '0008000000000000'), pack('H*', 'ADD0CC8D6E5DEBA1')),
            array(str_repeat("\x01", 24), pack('H*', '0004000000000000'), pack('H*', 'E6D5F82752AD63D1')),
            array(str_repeat("\x01", 24), pack('H*', '0002000000000000'), pack('H*', 'ECBFE3BD3F591A5E')),
            array(str_repeat("\x01", 24), pack('H*', '0001000000000000'), pack('H*', 'F356834379D165CD')),
            array(str_repeat("\x01", 24), pack('H*', '0000800000000000'), pack('H*', '2B9F982F20037FA9')),
            array(str_repeat("\x01", 24), pack('H*', '0000400000000000'), pack('H*', '889DE068A16F0BE6')),
            array(str_repeat("\x01", 24), pack('H*', '0000200000000000'), pack('H*', 'E19E275D846A1298')),
            array(str_repeat("\x01", 24), pack('H*', '0000100000000000'), pack('H*', '329A8ED523D71AEC')),
            array(str_repeat("\x01", 24), pack('H*', '0000080000000000'), pack('H*', 'E7FCE22557D23C97')),
            array(str_repeat("\x01", 24), pack('H*', '0000040000000000'), pack('H*', '12A9F5817FF2D65D')),
            array(str_repeat("\x01", 24), pack('H*', '0000020000000000'), pack('H*', 'A484C3AD38DC9C19')),
            array(str_repeat("\x01", 24), pack('H*', '0000010000000000'), pack('H*', 'FBE00A8A1EF8AD72')),
            array(str_repeat("\x01", 24), pack('H*', '0000008000000000'), pack('H*', '750D079407521363')),
            array(str_repeat("\x01", 24), pack('H*', '0000004000000000'), pack('H*', '64FEED9C724C2FAF')),
            array(str_repeat("\x01", 24), pack('H*', '0000002000000000'), pack('H*', 'F02B263B328E2B60')),
            array(str_repeat("\x01", 24), pack('H*', '0000001000000000'), pack('H*', '9D64555A9A10B852')),
            array(str_repeat("\x01", 24), pack('H*', '0000000800000000'), pack('H*', 'D106FF0BED5255D7')),
            array(str_repeat("\x01", 24), pack('H*', '0000000400000000'), pack('H*', 'E1652C6B138C64A5')),
            array(str_repeat("\x01", 24), pack('H*', '0000000200000000'), pack('H*', 'E428581186EC8F46')),
            array(str_repeat("\x01", 24), pack('H*', '0000000100000000'), pack('H*', 'AEB5F5EDE22D1A36')),
            array(str_repeat("\x01", 24), pack('H*', '0000000080000000'), pack('H*', 'E943D7568AEC0C5C')),
            array(str_repeat("\x01", 24), pack('H*', '0000000040000000'), pack('H*', 'DF98C8276F54B04B')),
            array(str_repeat("\x01", 24), pack('H*', '0000000020000000'), pack('H*', 'B160E4680F6C696F')),
            array(str_repeat("\x01", 24), pack('H*', '0000000010000000'), pack('H*', 'FA0752B07D9C4AB8')),
            array(str_repeat("\x01", 24), pack('H*', '0000000008000000'), pack('H*', 'CA3A2B036DBC8502')),
            array(str_repeat("\x01", 24), pack('H*', '0000000004000000'), pack('H*', '5E0905517BB59BCF')),
            array(str_repeat("\x01", 24), pack('H*', '0000000002000000'), pack('H*', '814EEB3B91D90726')),
            array(str_repeat("\x01", 24), pack('H*', '0000000001000000'), pack('H*', '4D49DB1532919C9F')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000800000'), pack('H*', '25EB5FC3F8CF0621')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000400000'), pack('H*', 'AB6A20C0620D1C6F')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000200000'), pack('H*', '79E90DBC98F92CCA')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000100000'), pack('H*', '866ECEDD8072BB0E')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000080000'), pack('H*', '8B54536F2F3E64A8')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000040000'), pack('H*', 'EA51D3975595B86B')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000020000'), pack('H*', 'CAFFC6AC4542DE31')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000010000'), pack('H*', '8DD45A2DDF90796C')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000008000'), pack('H*', '1029D55E880EC2D0')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000004000'), pack('H*', '5D86CB23639DBEA9')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000002000'), pack('H*', '1D1CA853AE7C0C5F')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000001000'), pack('H*', 'CE332329248F3228')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000800'), pack('H*', '8405D1ABE24FB942')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000400'), pack('H*', 'E643D78090CA4207')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000200'), pack('H*', '48221B9937748A23')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000100'), pack('H*', 'DD7C0BBD61FAFD54')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000080'), pack('H*', '2FBC291A570DB5C4')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000040'), pack('H*', 'E07C30D7E4E26E12')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000020'), pack('H*', '0953E2258E8E90A1')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000010'), pack('H*', '5B711BC4CEEBF2EE')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000008'), pack('H*', 'CC083F1E6D9E85F6')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000004'), pack('H*', 'D2FD8867D50D2DFE')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000002'), pack('H*', '06E7EA22CE92708F')),
            array(str_repeat("\x01", 24), pack('H*', '0000000000000001'), pack('H*', '166B40B44ABA4BD6'))
        );

        $result = array();

        foreach ($this->engines as $engine => $engineName) {
            foreach ($tests as $test) {
                $result[] = array($engine, $engineName, $test[0], $test[1], $test[2]);
            }
        }

        return $result;
    }

    /**
     * @dataProvider engineVectors
     */
    public function testVectors($engine, $engineName, $key, $plaintext, $expected)
    {
        $des = new Crypt_TripleDES();
        if (!$des->isValidEngine($engine)) {
            self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
        }
        $des->setPreferredEngine($engine);
        $des->setKey($key);
        $des->disablePadding();
        $result = $des->encrypt($plaintext);
        $plaintext = bin2hex($plaintext);
        $this->assertEquals($result, $expected, "Failed asserting that $plaintext yielded expected output in $engineName engine");
    }

    public function engineIVVectors()
    {
        $engines = array(
            CRYPT_ENGINE_INTERNAL => 'internal',
            CRYPT_ENGINE_MCRYPT => 'mcrypt',
            CRYPT_ENGINE_OPENSSL => 'OpenSSL',
        );

        // tests from http://csrc.nist.gov/groups/STM/cavp/documents/des/DESMMT.pdf
        $tests = array(
            // key, iv, plaintext, ciphertext
            array(
                pack('H*', '627f460e08104a10' . '43cd265d5840eaf1' . '313edf97df2a8a8c'),
                pack('H*', '8e29f75ea77e5475'),
                pack('H*', '326a494cd33fe756'),
                pack('H*', 'b22b8d66de970692')),
            array(
                pack('H*', '37ae5ebf46dff2dc' . '0754b94f31cbb385' . '5e7fd36dc870bfae'),
                pack('H*', '3d1de3cc132e3b65'),
                pack('H*', '84401f78fe6c10876d8ea23094ea5309'),
                pack('H*', '7b1f7c7e3b1c948ebd04a75ffba7d2f5'))
        );

        $result = array();

        foreach ($engines as $engine => $engineName) {
            foreach ($tests as $test) {
                $result[] = array($engine, $engineName, $test[0], $test[1], $test[2], $test[3]);
            }
        }

        return $result;
    }

    /**
     * @dataProvider engineIVVectors
     */
    public function testVectorsWithIV($engine, $engineName, $key, $iv, $plaintext, $expected)
    {
        $des = new Crypt_TripleDES();
        if (!$des->isValidEngine($engine)) {
            self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
        }
        $des->setPreferredEngine($engine);
        $des->setKey($key);
        $des->setIV($iv);
        $des->disablePadding();
        $result = $des->encrypt($plaintext);
        $plaintext = bin2hex($plaintext);
        $this->assertEquals($result, $expected, "Failed asserting that $plaintext yielded expected output in $engineName engine");
    }

    public function testInnerChaining()
    {
        // regular CBC returns
        //           e089b6d84708c6bc80be6c2da82bd19a79ffe11f02933ac1
        $expected = 'e089b6d84708c6bc6f04c8971121603d7be2861efae0f3f5';

        $des = new Crypt_TripleDES(CRYPT_DES_MODE_3CBC);
        $des->setKey('abcdefghijklmnopqrstuvwx');

        foreach ($this->engines as $engine => $engineName) {
            $des->setPreferredEngine($engine);
            if (!$des->isValidEngine($engine)) {
                self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
            }
            $result = bin2hex($des->encrypt(str_repeat('a', 16)));
            $this->assertEquals($result, $expected, "Failed asserting inner chainin worked correctly in $engineName engine");
        }
    }
}
phpseclib-1.0.18/tests/Unit/Crypt/TwofishTest.php000066400000000000000000000063551354156543400217530ustar00rootroot00000000000000
 * @copyright MMXIII Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Crypt/Twofish.php';

class Unit_Crypt_TwofishTest extends PhpseclibTestCase
{
    public function testVectors()
    {
        $engines = array(
            CRYPT_ENGINE_INTERNAL => 'internal',
            CRYPT_ENGINE_MCRYPT => 'mcrypt',
            CRYPT_ENGINE_OPENSSL => 'OpenSSL',
        );

        foreach ($engines as $engine => $name) {
            $tf = new Crypt_Twofish();
            $tf->disablePadding();

            // tests from https://www.schneier.com/code/ecb_ival.txt

            // key size = 128
            $key = pack('H*', '00000000000000000000000000000000');
            $tf->setKey($key);
            if (!$tf->isValidEngine($engine)) {
                self::markTestSkipped('Unable to initialize ' . $name . ' engine');
            }

            $plaintext = pack('H*', '00000000000000000000000000000000');
            $ciphertext = $tf->encrypt($plaintext);
            $expected = strtolower('9F589F5CF6122C32B6BFEC2F2AE8C35A');
            $this->assertEquals(bin2hex($ciphertext), $expected, "Failed asserting that $plaintext yielded expected output in $name engine");

            $expected = bin2hex($plaintext);
            $plaintext = bin2hex($tf->decrypt($ciphertext));
            $this->assertEquals($plaintext, $expected, "Failed asserting that $plaintext yielded expected output in $name engine");

            // key size = 192
            $key = pack('H*', '0123456789ABCDEFFEDCBA98765432100011223344556677');
            $tf->setKey($key);
            if (!$tf->isValidEngine($engine)) {
                self::markTestSkipped('Unable to initialize ' . $name . ' engine');
            }
            $plaintext = pack('H*', '00000000000000000000000000000000');
            $ciphertext = $tf->encrypt($plaintext);
            $expected = strtolower('CFD1D2E5A9BE9CDF501F13B892BD2248');
            $this->assertEquals(bin2hex($ciphertext), $expected, "Failed asserting that $plaintext yielded expected output in $name engine");

            $expected = bin2hex($plaintext);
            $plaintext = bin2hex($tf->decrypt($ciphertext));
            $this->assertEquals($plaintext, $expected, "Failed asserting that $plaintext yielded expected output in $name engine");

            // key size = 256
            $key = pack('H*', '0123456789ABCDEFFEDCBA987654321000112233445566778899AABBCCDDEEFF');
            $tf->setKey($key);
            if (!$tf->isValidEngine($engine)) {
                self::markTestSkipped('Unable to initialize ' . $name . ' engine');
            }
            $plaintext = pack('H*', '00000000000000000000000000000000');
            $ciphertext = $tf->encrypt($plaintext);
            $expected = strtolower('37527BE0052334B89F0CFCCAE87CFA20');
            $this->assertEquals(bin2hex($ciphertext), $expected, "Failed asserting that $plaintext yielded expected output in $name engine");

            $expected = bin2hex($plaintext);
            $plaintext = bin2hex($tf->decrypt($ciphertext));
            $this->assertEquals($plaintext, $expected, "Failed asserting that $plaintext yielded expected output in $name engine");
        }
    }
}
phpseclib-1.0.18/tests/Unit/File/000077500000000000000000000000001354156543400165245ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/File/ANSITest.php000066400000000000000000000026461354156543400206370ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'File/ANSI.php';

class Unit_File_ANSITest extends PhpseclibTestCase
{
    public function testCase1()
    {
        $str = "\x1B[07m"; // turn reverse video on
        $str.= "aaaaaaaaaaaaaaaaaa";
        $str.= "\x1B[10D"; // move cursor left 10 lines
        $str.= "\x1B[m"; // reset everything
        $str.= "bbb";

        $ansi = new File_ANSI();
        $ansi->appendString($str);

        $expected = '
';
        $expected.= 'aaaaaaaa';
        $expected.= 'bbb';
        $expected.= 'aaaaaaa';
        $expected.= '
';

        $this->assertSame($ansi->getScreen(), $expected);
    }

    public function testLineOverflow()
    {
        $str = '';
        foreach (range('a', 'y') as $char) {
            $str.= "$char\r\n";
        }
        $str.= str_repeat('z', 100);

        $ansi = new File_ANSI();
        $ansi->appendString($str);

        $screen = $ansi->getScreen();

        $lines = explode("\r\n", $screen);
        $this->assertSame(24, count($lines));
        $this->assertSame(str_repeat('z', 80), $lines[22]);
    }
}
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00*-0
	*H
010	UIT10U
I.T. Telecom S.R.L.1"0 UServizi di certificazione1<0:U3Regione Lombardia Certification Authority Cittadini0
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O%=W{%1UJs_w–Nqu(&i
	읨M
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'File/ASN1.php';

class Unit_File_ASN1Test extends PhpseclibTestCase
{
    /**
     * on older versions of File_ASN1 this would yield a PHP Warning
     * @group github275
     */
    public function testAnyString()
    {
        $KDC_REP = array(
            'type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'pvno' => array(
                    'constant' => 0,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'msg-type' => array(
                    'constant' => 1,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'padata' => array(
                    'constant' => 2,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'crealm' => array(
                    'constant' => 3,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'cname' => array(
                    'constant' => 4,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'ticket' => array(
                    'constant' => 5,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY),
                'enc-part' => array(
                    'constant' => 6,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY)
            )
        );

        $AS_REP = array(
            'class'    => FILE_ASN1_CLASS_APPLICATION,
            'cast'     => 11,
            'optional' => true,
            'explicit' => true
        ) + $KDC_REP;

        $str = 'a4IC3jCCAtqgAwIBBaEDAgELoi8wLTAroQMCAROiJAQiMCAwHqADAgEXoRcbFUNSRUFUVUlUWS5ORVR0ZXN0dXNlcqMPGw' .
               '1DUkVBVFVJVFkuTkVUpBUwE6ADAgEBoQwwChsIdGVzdHVzZXKlggFOYYIBSjCCAUagAwIBBaEPGw1DUkVBVFVJVFkuTkVU' .
               'oiIwIKADAgECoRkwFxsGa3JidGd0Gw1DUkVBVFVJVFkuTkVUo4IBCDCCAQSgAwIBF6EDAgEBooH3BIH0AQlxgm/j4z74Ki' .
               'GsJJnROhh8JAiN7pdvlnkxCYKdG6UgdfK/K0NZ+yz+Xg4kgFO1cQ4XYT4Fm3MTmOHzlFmbzlVkUqBI/RnWA9YTREC9Q7Mf' .
               'PPYfRxRG/C6FlahxHCOKj9GUj7bXg7Oq3Sm+QsKTS2bZT05biNf1s7tPCkdIOO0AAd7hvTCpTNAKl+OLN4cpA6pwwk5c3h' .
               '58Ce5/Uri5yBmrfwgkCD5AJUAI/WH56SEEvpifLc6C96w/7y2krAiZm5PyEO0HVhTzUjKGSHoSMb+Z3HI/ul+G9z0Z4qDu' .
               'NjvgP0jKdrKiwWN00NjpiQ0byZd4y6aCASEwggEdoAMCAReiggEUBIIBEHyi8DIbdcfw2DpniBJ3Sh8dDaEbQx+gWx3omC' .
               'TBEyts4sQGTwgQcqkWfeer8M+SkZs/GGZq2YYkyeF+9b6TxlYuX145NuB3KcyzaS7VNrX37E5nGgG8K6r5gTFOhLCqsjjv' .
               'gPXXqLeJo5D1nV+c8BPIEVsu/bbBPgSqpDwUs2mX1WkEg5vfb7kZMC8+LHiRy+sItvIiTtxxEsQ/GEF/ono3hZrEnDa/C+' .
               '4P3wep6uNMLnLzXJmUaAMaopjE+MOcai/t6T9Vg4pERF5Waqwg5ibAbVGK19HuS4LiKiaY3JsyYBuNkEDwiqM7i1Ekw3V+' .
               '+zoEIxqgXjGgPdrWkzU/H6rnXiqMtiZZqUXwWY0zkCmy';

        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER(base64_decode($str));
        $result = $asn1->asn1map($decoded[0], $AS_REP);

        $this->assertInternalType('array', $result);
    }

    /**
     * on older versions of File_ASN1 this would produce a null instead of an array
     * @group github275
     */
    public function testIncorrectString()
    {
        $PA_DATA = array(
            'type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'padata-type' => array(
                    'constant' => 1,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_INTEGER
                ),
                'padata-value' => array(
                    'constant' => 2,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_OCTET_STRING
                )
            )
        );

        $PrincipalName = array(
            'type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'name-type' => array(
                    'constant' => 0,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_INTEGER
                ),
                'name-string' => array(
                    'constant' => 1,
                    'optional' => true,
                    'explicit' => true,
                    'min' => 0,
                    'max' => -1,
                    'type' => FILE_ASN1_TYPE_SEQUENCE,
                    'children' => array('type' => FILE_ASN1_TYPE_IA5_STRING) // should be FILE_ASN1_TYPE_GENERAL_STRING
                )
            )
        );

        $Ticket = array(
            'class'    => FILE_ASN1_CLASS_APPLICATION,
            'cast'     => 1,
            'optional' => true,
            'explicit' => true,
            'type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'tkt-vno' => array(
                    'constant' => 0,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_INTEGER
                ),
                'realm' => array(
                    'constant' => 1,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY
                ),
                'sname' => array(
                    'constant' => 2,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY
                ),
                'enc-part' => array(
                    'constant' => 3,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY
                )
            )
        );

        $KDC_REP = array(
            'type' => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                'pvno' => array(
                    'constant' => 0,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_INTEGER),
                'msg-type' => array(
                     'constant' => 1,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_INTEGER),
                'padata' => array(
                    'constant' => 2,
                    'optional' => true,
                    'explicit' => true,
                    'min' => 0,
                    'max' => -1,
                    'type' => FILE_ASN1_TYPE_SEQUENCE,
                    'children' => $PA_DATA),
                'crealm' => array(
                    'constant' => 3,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_OCTET_STRING),
                'cname' => array(
                    'constant' => 4,
                    'optional' => true,
                    'explicit' => true) + $PrincipalName,
                    //'type' => FILE_ASN1_TYPE_ANY),
                'ticket' => array(
                    'constant' => 5,
                    'optional' => true,
                    'implicit' => true,
                    'min' => 0,
                    'max' => 1,
                    'type' => FILE_ASN1_TYPE_SEQUENCE,
                    'children' => $Ticket),
                'enc-part' => array(
                    'constant' => 6,
                    'optional' => true,
                    'explicit' => true,
                    'type' => FILE_ASN1_TYPE_ANY)
            )
        );

        $AS_REP = array(
            'class'    => FILE_ASN1_CLASS_APPLICATION,
            'cast'     => 11,
            'optional' => true,
            'explicit' => true
        ) + $KDC_REP;

        $str = 'a4IC3jCCAtqgAwIBBaEDAgELoi8wLTAroQMCAROiJAQiMCAwHqADAgEXoRcbFUNSRUFUVUlUWS5ORVR0ZXN0dXNlcqMPGw' .
               '1DUkVBVFVJVFkuTkVUpBUwE6ADAgEBoQwwChsIdGVzdHVzZXKlggFOYYIBSjCCAUagAwIBBaEPGw1DUkVBVFVJVFkuTkVU' .
               'oiIwIKADAgECoRkwFxsGa3JidGd0Gw1DUkVBVFVJVFkuTkVUo4IBCDCCAQSgAwIBF6EDAgEBooH3BIH0AQlxgm/j4z74Ki' .
               'GsJJnROhh8JAiN7pdvlnkxCYKdG6UgdfK/K0NZ+yz+Xg4kgFO1cQ4XYT4Fm3MTmOHzlFmbzlVkUqBI/RnWA9YTREC9Q7Mf' .
               'PPYfRxRG/C6FlahxHCOKj9GUj7bXg7Oq3Sm+QsKTS2bZT05biNf1s7tPCkdIOO0AAd7hvTCpTNAKl+OLN4cpA6pwwk5c3h' .
               '58Ce5/Uri5yBmrfwgkCD5AJUAI/WH56SEEvpifLc6C96w/7y2krAiZm5PyEO0HVhTzUjKGSHoSMb+Z3HI/ul+G9z0Z4qDu' .
               'NjvgP0jKdrKiwWN00NjpiQ0byZd4y6aCASEwggEdoAMCAReiggEUBIIBEHyi8DIbdcfw2DpniBJ3Sh8dDaEbQx+gWx3omC' .
               'TBEyts4sQGTwgQcqkWfeer8M+SkZs/GGZq2YYkyeF+9b6TxlYuX145NuB3KcyzaS7VNrX37E5nGgG8K6r5gTFOhLCqsjjv' .
               'gPXXqLeJo5D1nV+c8BPIEVsu/bbBPgSqpDwUs2mX1WkEg5vfb7kZMC8+LHiRy+sItvIiTtxxEsQ/GEF/ono3hZrEnDa/C+' .
               '4P3wep6uNMLnLzXJmUaAMaopjE+MOcai/t6T9Vg4pERF5Waqwg5ibAbVGK19HuS4LiKiaY3JsyYBuNkEDwiqM7i1Ekw3V+' .
               '+zoEIxqgXjGgPdrWkzU/H6rnXiqMtiZZqUXwWY0zkCmy';

        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER(base64_decode($str));
        $result = $asn1->asn1map($decoded[0], $AS_REP);

        $this->assertInternalType('array', $result);
    }

    /**
     * older versions of File_ASN1 didn't handle indefinite length tags very well
     */
    public function testIndefiniteLength()
    {
        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER(file_get_contents(dirname(__FILE__) . '/ASN1/FE.pdf.p7m'));
        $this->assertCount(5, $decoded[0]['content'][1]['content'][0]['content']); // older versions would have returned 3
    }

    public function testDefiniteLength()
    {
        // the following base64-encoded string is the X.509 cert from 
        $str = 'MIIDITCCAoqgAwIBAgIQT52W2WawmStUwpV8tBV9TTANBgkqhkiG9w0BAQUFADBM' .
               'MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg' .
               'THRkLjEWMBQGA1UEAxMNVGhhd3RlIFNHQyBDQTAeFw0xMTEwMjYwMDAwMDBaFw0x' .
               'MzA5MzAyMzU5NTlaMGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh' .
               'MRYwFAYDVQQHFA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKFApHb29nbGUgSW5jMRcw' .
               'FQYDVQQDFA53d3cuZ29vZ2xlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC' .
               'gYEA3rcmQ6aZhc04pxUJuc8PycNVjIjujI0oJyRLKl6g2Bb6YRhLz21ggNM1QDJy' .
               'wI8S2OVOj7my9tkVXlqGMaO6hqpryNlxjMzNJxMenUJdOPanrO/6YvMYgdQkRn8B' .
               'd3zGKokUmbuYOR2oGfs5AER9G5RqeC1prcB6LPrQ2iASmNMCAwEAAaOB5zCB5DAM' .
               'BgNVHRMBAf8EAjAAMDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwudGhhd3Rl' .
               'LmNvbS9UaGF3dGVTR0NDQS5jcmwwKAYDVR0lBCEwHwYIKwYBBQUHAwEGCCsGAQUF' .
               'BwMCBglghkgBhvhCBAEwcgYIKwYBBQUHAQEEZjBkMCIGCCsGAQUFBzABhhZodHRw' .
               'Oi8vb2NzcC50aGF3dGUuY29tMD4GCCsGAQUFBzAChjJodHRwOi8vd3d3LnRoYXd0' .
               'ZS5jb20vcmVwb3NpdG9yeS9UaGF3dGVfU0dDX0NBLmNydDANBgkqhkiG9w0BAQUF' .
               'AAOBgQAhrNWuyjSJWsKrUtKyNGadeqvu5nzVfsJcKLt0AMkQH0IT/GmKHiSgAgDp' .
               'ulvKGQSy068Bsn5fFNum21K5mvMSf3yinDtvmX3qUA12IxL/92ZzKbeVCq3Yi7Le' .
               'IOkKcGQRCMha8X2e7GmlpdWC1ycenlbN0nbVeSv3JUMcafC4+Q==';
        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER(base64_decode($str));
        $this->assertCount(3, $decoded[0]['content']);
    }

    /**
     * @group github477
     */
    public function testContextSpecificNonConstructed()
    {
        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER(base64_decode('MBaAFJtUo7c00HsI5EPZ4bkICfkOY2Pv'));
        $this->assertInternalType('string', $decoded[0]['content'][0]['content']);
    }

    /**
     * @group github602
     */
    public function testEmptyContextTag()
    {
        $asn1 = new File_ASN1();
        $decoded = $asn1->decodeBER("\xa0\x00");
        $this->assertInternalType('array', $decoded);
        $this->assertCount(0, $decoded[0]['content']);
    }

    /**
     * @group github1027
     */
    public function testInfiniteLoop()
    {
        $asn1 = new File_ASN1();
        $data = base64_decode('MD6gJQYKKwYBBAGCNxQCA6AXDBVvZmZpY2VAY2VydGRpZ2l0YWwucm+BFW9mZmljZUBjZXJ0ZGlnaXRhbC5ybw==');
        $asn1->decodeBER($data);
    }

    public function testApplicationTag()
    {
        $map = array(
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => array(
                // technically, default implies optional, but we'll define it as being optional, none-the-less, just to
                // reenforce that fact
                'version'             => array(
                    // if class isn't present it's assumed to be FILE_ASN1_CLASS_UNIVERSAL or
                    // (if constant is present) FILE_ASN1_CLASS_CONTEXT_SPECIFIC
                    'class'    => FILE_ASN1_CLASS_APPLICATION,
                    'cast'     => 2,
                    'optional' => true,
                    'explicit' => true,
                    'default'  => 'v1',
                    'type'     => FILE_ASN1_TYPE_INTEGER,
                    'mapping' => array('v1', 'v2', 'v3')
                )
            )
        );

        $data = array('version' => 'v3');

        $asn1 = new File_ASN1();
        $str = $asn1->encodeDER($data, $map);

        $decoded = $asn1->decodeBER($str);
        $arr = $asn1->asn1map($decoded[0], $map);

        $this->assertSame($data, $arr);
    }

    /**
     * @group github1296
     */
    public function testInvalidCertificate()
    {
        $data = 'a' . base64_decode('MD6gJQYKKwYBBAGCNxQCA6AXDBVvZmZpY2VAY2VydGRpZ2l0YWwucm+BFW9mZmljZUBjZXJ0ZGlnaXRhbC5ybw==');
        $asn1 = new File_ASN1();
        $asn1->decodeBER($data);
    }

    /**
     * @group github1367
     */
    public function testOIDs()
    {
        // from the example in 8.19.5 in the following:
        // https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=22
        $orig = pack('H*', '813403');
        $asn1 = new File_ASN1();
        $new = $asn1->_decodeOID($orig);
        $this->assertSame('2.100.3', $new);
        $this->assertSame($orig, $asn1->_encodeOID($new));

        // UUID OID from the following:
        // https://healthcaresecprivacy.blogspot.com/2011/02/creating-and-using-unique-id-uuid-oid.html
        $orig = '2.25.329800735698586629295641978511506172918';
        $asn1 = new File_ASN1();
        $new = $asn1->_encodeOID($orig);
        $this->assertSame(pack('H*', '6983f09da7ebcfdee0c7a1a7b2c0948cc8f9d776'), $new);
        $this->assertSame($orig, $asn1->_decodeOID($new));
    }

    /**
     * @group github1388
     */
    public function testExplicitImplicitDate()
    {
        $map = [
            'type'     => FILE_ASN1_TYPE_SEQUENCE,
            'children' => [
                'notBefore' => [
                                             'constant' => 0,
                                             'optional' => true,
                                             'implicit' => true,
                                             'type' => FILE_ASN1_TYPE_GENERALIZED_TIME],
                'notAfter'  => [
                                             'constant' => 1,
                                             'optional' => true,
                                             'implicit' => true,
                                             'type' => FILE_ASN1_TYPE_GENERALIZED_TIME]
            ]
        ];

        $asn1 = new File_ASN1();
        $a = pack('H*', '3026a011180f32303137303432313039303535305aa111180f32303138303432313230353935395a');
        $a = $asn1->decodeBER($a);
        $a = $asn1->asn1map($a[0], $map);

        $this->assertInternalType('array', $a);
    }
}
phpseclib-1.0.18/tests/Unit/File/X509/000077500000000000000000000000001354156543400171715ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/File/X509/CSRTest.php000066400000000000000000000131451354156543400211750ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'File/X509.php';
require_once 'Crypt/RSA.php';

class Unit_File_X509_CSRTest extends PhpseclibTestCase
{
    public function testLoadCSR()
    {
        $test = '-----BEGIN CERTIFICATE REQUEST-----
MIIBWzCBxQIBADAeMRwwGgYDVQQKDBNwaHBzZWNsaWIgZGVtbyBjZXJ0MIGdMAsG
CSqGSIb3DQEBAQOBjQAwgYkCgYEAtHDb4zoUyiRYsJ5PZrF/IJKAF9ZoHRpTxMA8
a7iyFdsl/vvZLNPsNnFTXXnGdvsyFDEsF7AubaIXw8UKFPYqQRTzSVsvnNgIoVYj
tTAXlB4oHipr7Kxcn4CXfmR0TYogyLvVZSZJYxh+CAuG4V9XM4HqkeE5gyBOsKGy
5FUU8zMCAwEAAaAAMA0GCSqGSIb3DQEBBQUAA4GBAJjdaA9K9DN5xvSiOlCmmV1E
npzHkI1Trraveu0gtRjT/EzHoqjCBI0ekCZ9+fhrex8Sm6Nsq9IgHYyrqnE+PQko
4Nf2w2U3DWxU26D5E9DlI+bLyOCq4jqATLjHyyAsOZY/2+U73AZ82MJM/mGdh5fQ
v5RwaQHmQEzHofTzF7I+
-----END CERTIFICATE REQUEST-----';

        $x509 = new File_X509();

        $spkac = $x509->loadCSR($test);

        $this->assertInternalType('array', $spkac);
    }

    public function testCSRWithAttributes()
    {
        $test = '-----BEGIN NEW CERTIFICATE REQUEST-----
MIIFGDCCAwACAQAwOjEWMBQGCgmSJomT8ixkARkWBnNlY3VyZTEgMB4GA1UEAxMX
LlNlY3VyZSBFbnRlcnByaXNlIENBIDEwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAw
ggIKAoICAQCzgEpL+Za7a3y7YpURDrxlGIBlks25fD0tHaZIYkBTaXA5h+9MWoXn
FA7AlIUt8pbBvXdJbOCmGaeQmBfBH0Qy9vTbx/DR2IOwzqy2ZHuurI5bPL12ceE2
Mxa9xgY/i7U6MAUtoA3amEd7cKj2fz9EWZruRladOX0DXv9KexSan+45QjCWH+u2
Cxem2zH9ZDNPGBuAF9YsAvkdHdAoX8aSm05ZAjUiO2e/+L57whh7zZiDY3WIhin7
N/2JNTKVO6lx50S8a34XUKBt3SKgSR941hcLrBYUNftUYsTPo40bzKKcWqemiH+w
jQiDrln4V2b5EbVeoGWe4UDPXCVmC6UPklG7iYfF0eeK4ujV8uc9PtV2LvGLOFdm
AYE3+FAba5byQATw/DY8EJKQ7ptPigJhVe47NNeJlsKwk1haJ9k8ZazjS+vT45B5
pqe0yBFAEon8TFnOLnAOblmKO12i0zqMUNAAlmr1c8jNjLr+dhruS+QropZmzZ24
mAnFG+Y0qpfhMzAxTGQyVjyGwDfRK/ARmtrGpmROjj5+6VuMmZ6Ljf3xN09epmtH
gJe+lYNBlpfUYg16tm+OusnziYnXL6nIo2ChOY/7GNJJif9fjvvaPDCC98K64av5
5rpIx7N/XH4hwHeQQkEQangExE+8UMyBNFNmvPnIHVHUZdYo4SLsYwIDAQABoIGY
MBsGCisGAQQBgjcNAgMxDRYLNi4zLjk2MDAuMi4weQYJKoZIhvcNAQkOMWwwajAQ
BgkrBgEEAYI3FQEEAwIBADAdBgNVHQ4EFgQU5nEIMEUT5mMd1WepmviwgK7dIzww
GQYJKwYBBAGCNxQCBAweCgBTAHUAYgBDAEEwCwYDVR0PBAQDAgGGMA8GA1UdEwEB
/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggIBAKZl6bAeaID3b/ic4aztL8ZZI7vi
D3A9otUKx6v1Xe63zDPR+DiWSnxb9m+l8OPtnWkcLkzEIM/IMWorHKUAJ/J871D0
Qx+0/HbkcrjMtVu/dNrtb9Z9CXup66ZvxTPcpEziq0/n2yw8QdBaa+lli65Qcwcy
tzMQK6WQTRYfvVCIX9AKcPKxwx1DLH+7hL/bERB1lUDu59Jx6fQfqJrFVOY2N8c0
MGvurfoHGmEoyCMIyvmIMu4+/wSNEE/sSDp4lZ6zuF6rf1m0GiLdTX2XJE+gfvep
JTFmp4S3WFqkszKvaxBIT+jV0XKTNDwnO+dpExwU4jZUh18CdEFkIUuQb0gFF8B7
WJFVpNdsRqZRPBz83BW1Kjo0yAmaoTrGNmG0p6Qf3K2zbk1+Jik3VZq4rvKoTi20
6RvLA2//cMNfkYPsuqvoHGe2e0GOLtIB63wJzloWROpb72ohEHsvCKullIJVSuiS
9sfTBAenHCyndgAEd4T3npTUdaiNumVEm5ilZId7LAYekJhkgFu3vlcl8blBJKjE
skVTp7JpBmdXCL/G/6H2SFjca4JMOAy3DxwlGdgneIaXazHs5nBK/BgKPIyPzZ4w
secxBTTCNgI48YezK3GDkn65cmlnkt6F6Mf0MwoDaXTuB88Jycbwb5ihKnHEJIsO
draiRBZruwMPwPIP
-----END NEW CERTIFICATE REQUEST-----';

        $x509 = new File_X509();

        $csr = $x509->loadCSR($test);

        $this->assertInternalType('array', $csr);
    }

    public function testCSRDER()
    {
        $csr = 'MIICdzCCAV8CAQEwDDEKMAgGA1UEAwwBeDCCASIwDQYJKoZIhvcNAQEBBQADggEP' .
               'ADCCAQoCggEBALtcrFDD2AHe3x2bR00wPDsPH6FJLxr5uc1ybb+ldDB5xNVImC8P' .
               'LU6VXDZ5z68KjSovs1q0OWJWfCjlAuGLzqO35s86LI1CFuTFdkScVHMwh8zUVFoP' .
               'pG7/9rKaNxCgaHs4evxjxQP2+Ny7tBqPLb/KV0exm6Twocf963jC/Tyn57G5erRf' .
               'zpFrfK7DozhxY7znumJ4FuSn0TVkD6PPwZFn9VoTjv2ZoJmacGK+0r5yNKG799F5' .
               'K8EgDrOCfbzCZjX6GJctyn2SNPTeBuXS9piH21FGnJAryv80zG+zUqFdEyoLUGJt' .
               '4Vy6+tDP9cW68fiwTZS1Oc1VeFdL1G/CrjkCAwEAAaAmMCQGCSqGSIb3DQEJDjEX' .
               'MBUwEwYKKwYBBAGCqlsBCQQFMAOCAQEwDQYJKoZIhvcNAQELBQADggEBAF4XOd+1' .
               'jkJOYRInNpHfhzSD/ktDY50gpLPuDvl4f/ZBlKrb1eDYQG5F3bnYzoZWHN4n+6Zs' .
               'CkljXs5ZPUZ5LuVpASumoG/aHXGz8c8NC3asJ1V73ljEPAfIXwqoIUoaP9jLL+Ee' .
               'zy/ZCi2NKWVo2D7ocnn79oblAem9ksSeQl4z3Gvhuug6MsMqn96NU/ZY/vjYzAjb' .
               'MAvJIVRY0rbCxbFa0K+XNJtF7GLyBxyPNFWCvADhvm9C4uPmoypYg7MY6EewJInN' .
               'xzMH7I4xDLjNu0VBa6lAxTvflp0joQHKlTYX0SDIKPbQivjZMuObPuxDtkVZ0rQl' .
               'AjmgMowaN5otTXM=';
        $csr = base64_decode($csr);

        $x509 = new File_X509();

        $csr = $x509->loadCSR($csr);

        $this->assertInternalType('array', $csr);
    }

    // on PHP 7.1, with older versions of phpseclib, this would produce a "A non-numeric value encountered" warning
    public function testNewCSR()
    {
        $rsa = new Crypt_RSA();
        $x509 = new File_X509();

        $rsa->loadKey('-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----');
        $x509->setPrivateKey($rsa);
        $x509->setDN(array('cn' => 'website.com'));
        $x509->saveCSR($x509->signCSR('sha256WithRSAEncryption'), FILE_X509_FORMAT_DER);
    }
}
phpseclib-1.0.18/tests/Unit/File/X509/SPKACTest.php000066400000000000000000000074711354156543400214140ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'File/X509.php';
require_once 'Crypt/RSA.php';

class Unit_File_X509_SPKACTest extends PhpseclibTestCase
{
    public function testLoadSPKAC()
    {
        $test = 'MIICQDCCASgwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQChgo9mWzQm3TSwGgpZnIc54' .
                'TZ8gYpfAO/AI0etvyWDqnFfdNCUQsqxTdSi6/rtrJdLGBsszRGrRIc/0JqmjM+jCHGYutLeo4xwgr' .
                'a3HAZrWDypL5IlRWnLmLA4U/qGXCXNSk+9NrJl39X3IDA8o/aOJyr9iMUJMvswcWjVjPom3NhAgmJ' .
                'ZwW0vUEMw9zszExpiRnGSO5XXntQW2qvfzo+J3NzS3BBbKxEmTsfOLHextcXeFQUaBQHXB/WOtweW' .
                'Y/Bd4iZ8ETmhal28g1HWVcTFPD+V+KPRFeARlVEW6JmcJucW2WdJlBGKXXXPEfdHrDS3OgD/eDWfM' .
                'JE4mChZ/icxAgMBAAEWADANBgkqhkiG9w0BAQQFAAOCAQEAUMvIKhlSgEgbC081b/FJwh6mbuVgYN' .
                'ZV37Ts2WjrHoDFlabu9WXU8xzgaXct3sO51vJM5I36rY4UPyc6w3y9dLaamEwKUoWnpHG8mlXs2JG' .
                'GEUOvxh5z9yfk/2ZmdCVBlKnU1LDB+ZDyNyNh5B0YULrJKw9e0jV+ymP7srwUSBcdUfZh1KEKGVIN' .
                'Uv4J3GuL8V63E2unWCHGRPw4EmFVTbWpgMx96XR7p/pMavu6/pVKgYQqWLOmEeOK+dmT/QVon28d5' .
                'dmeL7aWrpP+3x3L0A9cATksracQX676XogdAEXJ59fcr/S5AGw1TFErbyBbfyeAWvzDZIXeMXpb9h' .
                'yNtA==';

        $x509 = new File_X509();

        $spkac = $x509->loadSPKAC($test);

        $this->assertInternalType('array', $spkac);

        $spkac = $x509->loadSPKAC('SPKAC=' . $test);

        $this->assertInternalType('array', $spkac);

        $this->assertTrue(
            $x509->validateSignature(),
            'Failed asserting that the signature is valid'
        );

        $pubKey = $x509->getPublicKey();

        $this->assertInternalType('string', "$pubKey");
    }

    public function testSaveSPKAC()
    {
        $privKey = new Crypt_RSA();
        extract($privKey->createKey());
        $privKey->loadKey($privatekey);

        $x509 = new File_X509();
        $x509->setPrivateKey($privKey);
        $x509->setChallenge('...');

        $spkac = $x509->signSPKAC();
        $this->assertInternalType('array', $spkac);

        $this->assertInternalType('string', $x509->saveSPKAC($spkac));

        $x509 = new File_X509();
        $x509->setPrivateKey($privKey);

        $spkac = $x509->signSPKAC();
        $this->assertInternalType('array', $spkac);

        $this->assertInternalType('string', $x509->saveSPKAC($spkac));
    }

    public function testBadSignatureSPKAC()
    {
        $test = 'MIICQDCCASgwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQChgo9mWzQm3TSwGgpZnIc54' .
                'TZ8gYpfAO/AI0etvyWDqnFfdNCUQsqxTdSi6/rtrJdLGBsszRGrRIc/0JqmjM+jCHGYutLeo4xwgr' .
                'a3HAZrWDypL5IlRWnLmLA4U/qGXCXNSk+9NrJl39X3IDA8o/aOJyr9iMUJMvswcWjVjPom3NhAgmJ' .
                'ZwW0vUEMw9zszExpiRnGSO5XXntQW2qvfzo+J3NzS3BBbKxEmTsfOLHextcXeFQUaBQHXB/WOtweW' .
                'Y/Bd4iZ8ETmhal28g1HWVcTFPD+V+KPRFeARlVEW6JmcJucW2WdJlBGKXXXPEfdHrDS3OgD/eDWfM' .
                'JE4mChZ/icxAgMBAAEWADANBgkqhkiG9w0BAQQFAAOCAQEAUMvIKhlSgEgbC081b/FJwh6mbuVgYN' .
                'ZV37Ts2WjrHoDFlabu9WXU8xzgaXct3sO51vJM5I36rY4UPyc6w3y9dLaamEwKUoWnpHG8mlXs2JG' .
                'GEUOvxh5z9yfk/2ZmdCVBlKnU1LDB+ZDyNyNh5B0YULrJKw9e0jV+ymP7srwUSBcdUfZh1KEKGVIN' .
                'Uv4J3GuL8V63E2unWCHGRPw4EmFVTbWpgMx96XR7p/pMavu6/pVKgYQqWLOmEeOK+dmT/QVon28d5' .
                'dmeL7aWrpP+3x3L0A9cATksracQX676XogdAEXJ59fcr/S5AGw1TFErbyBbfyeAWvzDZIXeMXpb9h' .
                'yNtA==';

        $x509 = new File_X509();

        $spkac = $x509->loadSPKAC($test);

        $spkac['publicKeyAndChallenge']['challenge'] = 'zzzz';

        $x509->loadSPKAC($x509->saveSPKAC($spkac));

        $this->assertFalse(
            $x509->validateSignature(),
            'Failed asserting that the signature is invalid'
        );
    }
}
phpseclib-1.0.18/tests/Unit/File/X509/X509Test.php000066400000000000000000001131221354156543400212070ustar00rootroot00000000000000
 * @copyright 2014 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'File/X509.php';

class Unit_File_X509_X509Test extends PhpseclibTestCase
{
    public function testExtensionMapping()
    {
        $test = '-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----';

        $x509 = new File_X509();

        $cert = $x509->loadX509($test);

        $this->assertInternalType('array', $cert['tbsCertificate']['extensions'][3]['extnValue']);
    }

    public function testLoadUnsupportedExtension()
    {
        $test = '-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----';

        $x509 = new File_X509();

        $cert = $x509->loadX509($test);

        $this->assertEquals('MDUwDgYIKoZIhvcNAwICAgCAMA4GCCqGSIb3DQMEAgIAgDAHBgUrDgMCBzAKBggqhkiG9w0DBw==', $cert['tbsCertificate']['extensions'][8]['extnValue']);
    }

    public function testSaveUnsupportedExtension()
    {
        $x509 = new File_X509();
        $cert = $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');

        $asn1 = new File_ASN1();

        $value = $this->_encodeOID('1.2.3.4');
        $ext = chr(FILE_ASN1_TYPE_OBJECT_IDENTIFIER) . $asn1->_encodeLength(strlen($value)) . $value;
        $value = 'zzzzzzzzz';
        $ext.= chr(FILE_ASN1_TYPE_OCTET_STRING) . $asn1->_encodeLength(strlen($value)) . $value;
        $ext = chr(FILE_ASN1_TYPE_SEQUENCE | 0x20) . $asn1->_encodeLength(strlen($ext)) . $ext;

        $cert['tbsCertificate']['extensions'][4] = new File_ASN1_Element($ext);

        $result = $x509->loadX509($x509->saveX509($cert));

        $this->assertCount(5, $result['tbsCertificate']['extensions']);
    }

    /**
     * @group github705
     */
    public function testSaveNullRSAParam()
    {
        $privKey = new Crypt_RSA();
        $privKey->loadKey('-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----');

        $pubKey = new Crypt_RSA();
        $pubKey->loadKey($privKey->getPublicKey());
        $pubKey->setPublicKey();

        $subject = new File_X509();
        $subject->setDNProp('id-at-organizationName', 'phpseclib demo cert');
        $subject->setPublicKey($pubKey);

        $issuer = new File_X509();
        $issuer->setPrivateKey($privKey);
        $issuer->setDN($subject->getDN());

        $x509 = new File_X509();

        $result = $x509->sign($issuer, $subject);
        $cert = $x509->saveX509($result);
        $cert = $x509->loadX509($cert);

        $this->assertArrayHasKey('parameters', $cert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']);
        $this->assertArrayHasKey('parameters', $cert['signatureAlgorithm']);
        $this->assertArrayHasKey('parameters', $cert['tbsCertificate']['signature']);
    }

    private function _encodeOID($oid)
    {
        if ($oid === false) {
            user_error('Invalid OID');
            return false;
        }
        $value = '';
        $parts = explode('.', $oid);
        $value = chr(40 * $parts[0] + $parts[1]);
        for ($i = 2; $i < count($parts); $i++) {
            $temp = '';
            if (!$parts[$i]) {
                $temp = "\0";
            } else {
                while ($parts[$i]) {
                    $temp = chr(0x80 | ($parts[$i] & 0x7F)) . $temp;
                    $parts[$i] >>= 7;
                }
                $temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F);
            }
            $value.= $temp;
        }
        return $value;
    }

    public function testGetOID()
    {
        $x509 = new File_X509();
        $this->assertEquals($x509->getOID('2.16.840.1.101.3.4.2.1'), '2.16.840.1.101.3.4.2.1');
        $this->assertEquals($x509->getOID('id-sha256'), '2.16.840.1.101.3.4.2.1');
        $this->assertEquals($x509->getOID('zzz'), 'zzz');
    }

    public function testPostalAddress()
    {
        $x509 = new File_X509();
        $decoded = $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');
        $x509->loadX509($x509->saveX509($decoded));
        $expected = array(
            array(
                array('utf8String' => "Al. Marsza\xC5\x82ka Pi\xC5\x82sudskiego 52/54"),
                array('utf8String' => '81-382 Gdynia'),
                array('utf8String' => 'Polska'),
                array('utf8String' => 'pomorskie')
            )
        );
        $this->assertEquals($x509->getDNProp('id-at-postalAddress'), $expected);

        $expected = "C=PL, O=Urz\xC4\x85d Miasta Gdyni/serialNumber=PESEL: 61060603118, CN=Jerzy Przeworski/postalAddress=" . '0F\X0C"AL. MARSZA\XC5\X82KA PI\XC5\X82SUDSKIEGO 52/54\X0C\X0D81-382 GDYNIA\X0C\X06POLSKA\X0C\X09POMORSKIE/givenName=Jerzy, SN=Przeworski';
        $this->assertEquals($x509->getDN(FILE_X509_DN_STRING), $expected);
    }

    public function testStrictComparison()
    {
        $x509 = new File_X509();
        $x509->loadCA('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');

        $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');
        $this->assertFalse($x509->validateSignature());
    }

    public function testUtcTimeWithoutSeconds()
    {
        $test = '-----BEGIN CERTIFICATE-----
MIIGFDCCBPygAwIBAgIDKCHVMA0GCSqGSIb3DQEBBQUAMIHcMQswCQYDVQQGEwJVUzEQMA4GA1UE
CBMHQXJpem9uYTETMBEGA1UEBxMKU2NvdHRzZGFsZTElMCMGA1UEChMcU3RhcmZpZWxkIFRlY2hu
b2xvZ2llcywgSW5jLjE5MDcGA1UECxMwaHR0cDovL2NlcnRpZmljYXRlcy5zdGFyZmllbGR0ZWNo
LmNvbS9yZXBvc2l0b3J5MTEwLwYDVQQDEyhTdGFyZmllbGQgU2VjdXJlIENlcnRpZmljYXRpb24g
QXV0aG9yaXR5MREwDwYDVQQFEwgxMDY4ODQzNTAcFwsxNDAxMDcwMDAwWhcNMTYwNDAxMDcwMDAw
WjCB6zETMBEGCysGAQQBgjc8AgEDEwJVUzEYMBYGCysGAQQBgjc8AgECEwdBcml6b25hMR0wGwYD
VQQPExRQcml2YXRlIE9yZ2FuaXphdGlvbjEUMBIGA1UEBRMLUi0xNzI0NzQxLTYxCzAJBgNVBAYT
AlVTMRAwDgYDVQQIEwdBcml6b25hMRMwEQYDVQQHEwpTY290dHNkYWxlMSQwIgYDVQQKExtTdGFy
ZmllbGQgVGVjaG5vbG9naWVzLCBMTEMxKzApBgNVBAMTInZhbGlkLnNmaS5jYXRlc3Quc3RhcmZp
ZWxkdGVjaC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCt1LHQOza9tkKxwGL+
/yKi/Fe5HM0sjvcM4ic1XVrvpewa4P/04IzGSjIGO3CXaSArxQMSzsTt2dcO9tSJ1Zk8c9NZXM8e
Vqx92iTMEf9OQcubWpzWmrPc3TAFhbVnfEmCptsXEgtxbAIbntrNeDk/hBPdl4DYFYRdm3ZTk4JM
If/quDZe5Oti53J0UsxWXSSoqKyPNdb671Q+OTQfSDj7kVF4+Ri3FIeAV16d2UnpBW1bgNqA5yIT
RskHE4bX98HDNHUTHioHpgA+fXfejWkGB/0FQN4HbZcysYHhf1L5cWBtz9w5J00YmjM5fzWvTc3U
UF9ou7m7JE4aqEbNOWb9AgMBAAGjggHOMIIByjAMBgNVHRMBAf8EAjAAMA4GA1UdDwEB/wQEAwIF
oDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwLQYDVR0RBCYwJIIidmFsaWQuc2ZpLmNh
dGVzdC5zdGFyZmllbGR0ZWNoLmNvbTAdBgNVHQ4EFgQUcO+QEqZcHphPW9szww9ty+1AGmQwHwYD
VR0jBBgwFoAUSUtSJ9EbvPKhIWpie1FCeorX1VYwOAYDVR0fBDEwLzAtoCugKYYnaHR0cDovL2Ny
bC5zdGFyZmllbGR0ZWNoLmNvbS9zZnMzLTAuY3JsMIGNBggrBgEFBQcBAQSBgDB+MCoGCCsGAQUF
BzABhh5odHRwOi8vb2NzcC5zdGFyZmllbGR0ZWNoLmNvbS8wUAYIKwYBBQUHMAKGRGh0dHA6Ly9j
ZXJ0aWZpY2F0ZXMuc3RhcmZpZWxkdGVjaC5jb20vcmVwb3NpdG9yeS9zZl9pbnRlcm1lZGlhdGUu
Y3J0MFIGA1UdIARLMEkwRwYLYIZIAYb9bgEHFwMwODA2BggrBgEFBQcCARYqaHR0cDovL2NlcnRz
LnN0YXJmaWVsZHRlY2guY29tL3JlcG9zaXRvcnkvMA0GCSqGSIb3DQEBBQUAA4IBAQAViYkLUjQk
xWRmZl4DutL0/9/wJSURcJ1qunLP+TImJFp0A9RE/MNKZOmQoAEoH6hMg7FL4etkvTcnruTdcx+3
mvqYiECUiUEx6pkx3dmkYgZACEuk2nfyJ0MkV/zwzqmI8aV+kunpOQv93aePZbrBgaAzkE8jDlEx
td7c4pE7JF40jxmvDwjZHwpyNDULreGtFBij7JcWJCfihM3uetqrao0kOoeih1PQyJXtz2RldhFY
s6Jdk3ILYv+84t5UMO+aS9nVBXIcbgaGjIMZjHDgR/tE9FKFB66k8UTDzAwwEs38VV24zx6hlOzT
F7xAUxmPUnNb2teatMf2Rmj0fs+d
-----END CERTIFICATE-----
';

        $x509 = new File_X509();

        $cert = $x509->loadX509($test);

        $this->assertEquals($cert['tbsCertificate']['validity']['notBefore']['utcTime'], 'Tue, 07 Jan 2014 00:00:00 +0000');
        $this->assertEquals($cert['tbsCertificate']['validity']['notAfter']['utcTime'], 'Fri, 01 Apr 2016 07:00:00 +0000');
    }

    public function testValidateURL()
    {
        $test = '-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----';

        $x509 = new File_X509();

        $cert = $x509->loadX509($test);

        $this->assertTrue($x509->validateURL('https://www.google.com'));
    }

    public function testValidateSignatureWithoutKeyIdentifier()
    {
        $x509 = new File_X509();
        $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');

        $authorityKeyIdentifier = $x509->getExtension('id-ce-authorityKeyIdentifier');
        $this->assertNotNull($authorityKeyIdentifier);
        $this->assertFalse(isset($authorityKeyIdentifier['keyIdentifier']));

        $x509->loadCA('-----BEGIN CERTIFICATE-----
MIIDITCCAoqgAwIBAgIJAPhY+J+6RrkTMA0GCSqGSIb3DQEBBQUAMHcxCzAJBgNV
BAYTAlVLMQ8wDQYDVQQIDAZMb25kb24xDzANBgNVBAcMBkxvbmRvbjEMMAoGA1UE
CgwDTVBTMQwwCgYDVQQLDANEZXYxDTALBgNVBAMMBHRlc3QxGzAZBgkqhkiG9w0B
CQEWDGRla2lAbXBzLmNvbTAeFw0xNzExMjQxODI3NDlaFw0xODExMjQxODI3NDla
MHcxCzAJBgNVBAYTAlVLMQ8wDQYDVQQIDAZMb25kb24xDzANBgNVBAcMBkxvbmRv
bjEMMAoGA1UECgwDTVBTMQwwCgYDVQQLDANEZXYxDTALBgNVBAMMBHRlc3QxGzAZ
BgkqhkiG9w0BCQEWDGRla2lAbXBzLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAw
gYkCgYEA022CwduFLxKCwwKp2WTTpBu1vhcVywOAW0rNIfuSa7XsYyX5rCSScE4d
YW8hUgWbZSoJMk1s1omZarmwMAIeknpigZSKWUhEJF3IVnc1tW3mGaSAEvKg6r4g
unKttJV2aDW8w3Ew2qzP0G8sJwMX7y49XQumG5IgpuVXkiydTwsCAwEAAaOBtDCB
sTCBkwYDVR0jBIGLMIGIoXukeTB3MQswCQYDVQQGEwJVSzEPMA0GA1UECAwGTG9u
ZG9uMQ8wDQYDVQQHDAZMb25kb24xDDAKBgNVBAoMA01QUzEMMAoGA1UECwwDRGV2
MQ0wCwYDVQQDDAR0ZXN0MRswGQYJKoZIhvcNAQkBFgxkZWtpQG1wcy5jb22CCQD4
WPifuka5EzAMBgNVHRMEBTADAQH/MAsGA1UdDwQEAwIE8DANBgkqhkiG9w0BAQUF
AAOBgQBNhIESJpRiYBPDdIsdfOyuclzmN+5KHXicAXN4WXFiYgVQhML44Vb7Macb
X5ZBGsa3olRvoKrhg8ian7NyfRviAk0iO8EAAFCeeYHPN6bbloGfUcuf72P8576w
HI8pYRZmT7tKW3HxlZLJGGVo5CgBawdiWngK5v+LwWiNRTqxJA==
-----END CERTIFICATE-----');

        $this->assertTrue($x509->validateSignature());
    }

    public function testValidateSignatureSelfSignedWithoutKeyIdentifier()
    {
        $x509 = new File_X509();
        $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');

        $authorityKeyIdentifier = $x509->getExtension('id-ce-authorityKeyIdentifier');
        $this->assertNotNull($authorityKeyIdentifier);
        $this->assertFalse(isset($authorityKeyIdentifier['keyIdentifier']));

        $this->assertTrue($x509->validateSignature(false));
    }

    /**
     * @group github1243
     */
    public function testExtensionRemoval()
    {
        // Load the CA and its private key.
        $pemcakey = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';
        $cakey = new Crypt_RSA();
        $cakey->loadKey($pemcakey);
        $pemca = '-----BEGIN CERTIFICATE-----
MIICADCCAWmgAwIBAgIUJXQulcz5xkTam8UGC/yn6iVaiWwwDQYJKoZIhvcNAQEF
BQAwHDEaMBgGA1UECgwRcGhwc2VjbGliIGRlbW8gQ0EwHhcNMTgwMTIxMTc0NzM0
WhcNMTkwMTIxMTc0NzM0WjAcMRowGAYDVQQKDBFwaHBzZWNsaWIgZGVtbyBDQTCB
nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAqSrTRQXbUXfHhXKuy+0cb5HnlBXH
OEA2OqywyVKTxqdai/S+6ZfqytC+ukxkrPsGUzOGsAz9ne+R2Rtv/Szl+V8uKAG+
2ktj4iw0JlWvNbdbAONm7N1AcWpPcOI3I+tt4HrAxunTdbBaalavf2eCTpzybtT1
88HLo97eyeUCxUsCAwEAAaM/MD0wCwYDVR0PBAQDAgEGMA8GA1UdEwEB/wQFMAMB
Af8wHQYDVR0OBBYEFCS1BJ12nN8ObQWE4OgOOSH9DxTRMA0GCSqGSIb3DQEBBQUA
A4GBAHkSnlJnlkwDEUcENKWFZpfNgZu9HUvEuLDVOnhvsdd2MDr8EbVbgMHYNWnV
+ZOS/dqbuCd9Vd27JsBC2YHklaq9/V5zMbrEBiMLo5P5WL9qrz0qbmK/aruP+VX7
cKVMm1WnOQd4aQgCvzv2r7/gsdX++496vRpBMTfwa1qLBjG6
-----END CERTIFICATE-----';
        $ca = new File_X509();
        $ca->loadX509($pemca);
        $ca->setPrivateKey($cakey);

        // Read the old certificate.
        $oldcert = new File_X509();
        $oldcert->loadCA($pemca);
        $oldcert->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');
        $this->assertTrue($oldcert->validateSignature());

        // Set new dates and serial number.
        $newcert = new File_X509();
        $newcert->setStartDate('-1 day');
        $newcert->setEndDate('+2 years');
        //$newcert->setSerialNumber('1234', 10);

        $oldcert->setDomain('www.google.com');

        // Produce the new certificate by signing the old one.
        $crt = $newcert->loadX509($newcert->saveX509($newcert->sign($ca, $oldcert)));

        // Output new certificate.
        $newcert->saveX509($crt);
    }

    public function testAuthorityInfoAccess()
    {
        $x509 = new File_X509();
        $x509->loadCA('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');
        $x509->loadX509('-----BEGIN CERTIFICATE-----
MIIG3TCCBcWgAwIBAgIQAtB7LVsRCmgbyWiiw7Sf5jANBgkqhkiG9w0BAQsFADBN
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMScwJQYDVQQDEx5E
aWdpQ2VydCBTSEEyIFNlY3VyZSBTZXJ2ZXIgQ0EwHhcNMTcwOTEzMDAwMDAwWhcN
MTkwOTEzMTIwMDAwWjBqMQswCQYDVQQGEwJVUzETMBEGA1UECBMKV2FzaGluZ3Rv
bjEQMA4GA1UEBxMHUmVkbW9uZDEeMBwGA1UEChMVTWljcm9zb2Z0IENvcnBvcmF0
aW9uMRQwEgYDVQQDEwtvdXRsb29rLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEP
ADCCAQoCggEBAIz2tovvgBmK4sOHgpyzCdtXrI0XOujctf6LHMj16wzUnMEatioS
tH0Pz0dKkCr/0yd9qtXbGhD1o6WhFsd7k651K9MZ98+uQ29SzTIAl6y1gkaBbp4h
MFXcE5EpRNHHmK8t2OR7hzmrvvNr6OTYv7BhVCw9pSrQqEFNno0K2TQRhAD9uzrL
OY+rBBVedCXWXH7uhZoZ6joUU7CEA5pPMzKPL1ro+Eorc8vt5FYOC+oAT587+b1M
z+jbZVQlq0qaMkBKRtUIII78MYY0n8DopGqHyzwqWoGySHJNC8256q+MwsZQvvQ3
vmy/rf61h2sg1tU0s7O88Yufxp0LSaMMzZcCAwEAAaOCA5owggOWMB8GA1UdIwQY
MBaAFA+AYRyCMWHVLyjnjUY4tCzhxtniMB0GA1UdDgQWBBT7hLoZ/03rqwcslIc2
0k0z2R+vNTCCAdwGA1UdEQSCAdMwggHPggtvdXRsb29rLmNvbYIWKi5jbG8uZm9v
dHByaW50ZG5zLmNvbYIWKi5ucmIuZm9vdHByaW50ZG5zLmNvbYIgYXR0YWNobWVu
dC5vdXRsb29rLm9mZmljZXBwZS5uZXSCG2F0dGFjaG1lbnQub3V0bG9vay5saXZl
Lm5ldIIdYXR0YWNobWVudC5vdXRsb29rLm9mZmljZS5uZXSCHWNjcy5sb2dpbi5t
aWNyb3NvZnRvbmxpbmUuY29tgiFjY3Mtc2RmLmxvZ2luLm1pY3Jvc29mdG9ubGlu
ZS5jb22CC2hvdG1haWwuY29tgg0qLmhvdG1haWwuY29tggoqLmxpdmUuY29tghZt
YWlsLnNlcnZpY2VzLmxpdmUuY29tgg1vZmZpY2UzNjUuY29tgg8qLm9mZmljZTM2
NS5jb22CFyoub3V0bG9vay5vZmZpY2UzNjUuY29tgg0qLm91dGxvb2suY29tghYq
LmludGVybmFsLm91dGxvb2suY29tggwqLm9mZmljZS5jb22CEm91dGxvb2sub2Zm
aWNlLmNvbYIUc3Vic3RyYXRlLm9mZmljZS5jb22CGHN1YnN0cmF0ZS1zZGYub2Zm
aWNlLmNvbTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsG
AQUFBwMCMGsGA1UdHwRkMGIwL6AtoCuGKWh0dHA6Ly9jcmwzLmRpZ2ljZXJ0LmNv
bS9zc2NhLXNoYTItZzEuY3JsMC+gLaArhilodHRwOi8vY3JsNC5kaWdpY2VydC5j
b20vc3NjYS1zaGEyLWcxLmNybDBMBgNVHSAERTBDMDcGCWCGSAGG/WwBATAqMCgG
CCsGAQUFBwIBFhxodHRwczovL3d3dy5kaWdpY2VydC5jb20vQ1BTMAgGBmeBDAEC
AjB8BggrBgEFBQcBAQRwMG4wJAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmRpZ2lj
ZXJ0LmNvbTBGBggrBgEFBQcwAoY6aHR0cDovL2NhY2VydHMuZGlnaWNlcnQuY29t
L0RpZ2lDZXJ0U0hBMlNlY3VyZVNlcnZlckNBLmNydDAMBgNVHRMBAf8EAjAAMA0G
CSqGSIb3DQEBCwUAA4IBAQA3zjN7I6jTeL+08nhG5eAY0q4pLY40bCQHqONBLSI3
uRmQFUfrQOPYBqLC1QU+J2Z2HcX7YiqE3WAR3ODS9g2BAVXkKOQKNBnr2hKwueOz
qPwyvTyzcIQYUw+SrTX+bfJwYMTmZvtP9S7/pB1jPhrV7YGsD55AI9bGa9cmH7VQ
OiL1p5Qovg5KRsldoZeC04OF/UQIR1fv47VGptsHHGypvSo1JinJFQMXylqLIrUW
lV66p3Ui7pFABGc/Lv7nOyANXfLugBO8MyzydGA4NRGiS2MbGpswPCg154pWausU
M0qaEPsM2o3CSTfxSJQQIyEe+izV3UQqYSyWkNqCCFPN
-----END CERTIFICATE-----');

        $x509->setRecurLimit(0);
        $this->assertFalse($x509->validateSignature());

        $x509->setRecurLimit(5);
        $this->assertTrue($x509->validateSignature());
    }

    public function testValidateDate()
    {
        $x509 = new File_X509();
        $x509->loadX509('-----BEGIN CERTIFICATE-----
MIIDITCCAoqgAwIBAgIQT52W2WawmStUwpV8tBV9TTANBgkqhkiG9w0BAQUFADBM
MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg
THRkLjEWMBQGA1UEAxMNVGhhd3RlIFNHQyBDQTAeFw0xMTEwMjYwMDAwMDBaFw0x
MzA5MzAyMzU5NTlaMGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh
MRYwFAYDVQQHFA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKFApHb29nbGUgSW5jMRcw
FQYDVQQDFA53d3cuZ29vZ2xlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC
gYEA3rcmQ6aZhc04pxUJuc8PycNVjIjujI0oJyRLKl6g2Bb6YRhLz21ggNM1QDJy
wI8S2OVOj7my9tkVXlqGMaO6hqpryNlxjMzNJxMenUJdOPanrO/6YvMYgdQkRn8B
d3zGKokUmbuYOR2oGfs5AER9G5RqeC1prcB6LPrQ2iASmNMCAwEAAaOB5zCB5DAM
BgNVHRMBAf8EAjAAMDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwudGhhd3Rl
LmNvbS9UaGF3dGVTR0NDQS5jcmwwKAYDVR0lBCEwHwYIKwYBBQUHAwEGCCsGAQUF
BwMCBglghkgBhvhCBAEwcgYIKwYBBQUHAQEEZjBkMCIGCCsGAQUFBzABhhZodHRw
Oi8vb2NzcC50aGF3dGUuY29tMD4GCCsGAQUFBzAChjJodHRwOi8vd3d3LnRoYXd0
ZS5jb20vcmVwb3NpdG9yeS9UaGF3dGVfU0dDX0NBLmNydDANBgkqhkiG9w0BAQUF
AAOBgQAhrNWuyjSJWsKrUtKyNGadeqvu5nzVfsJcKLt0AMkQH0IT/GmKHiSgAgDp
ulvKGQSy068Bsn5fFNum21K5mvMSf3yinDtvmX3qUA12IxL/92ZzKbeVCq3Yi7Le
IOkKcGQRCMha8X2e7GmlpdWC1ycenlbN0nbVeSv3JUMcafC4+Q==
-----END CERTIFICATE-----');

        $this->assertFalse($x509->validateDate('Nov 22, 2018'));
        $this->assertTrue($x509->validateDate('Nov 22, 2012'));
    }

    public function testLongTagOnBadCert()
    {
        // the problem with this cert is that it'd cause an infinite loop
        $x509 = new File_X509();
        $r = @$x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');

        $this->assertFalse($r);
    }

    /**
     * @group github1387
     */
    public function testNameConstraintIP()
    {
        $x509 = new File_X509();
        $r = $x509->loadX509('-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----');
        $r = $x509->saveX509($r);
        $r = $x509->loadX509($r);
        $this->assertSame($r['tbsCertificate']['extensions'][5]['extnValue']['excludedSubtrees'][1]['base']['iPAddress'], ['0.0.0.0', '0.0.0.0']);
    }
}
phpseclib-1.0.18/tests/Unit/Math/000077500000000000000000000000001354156543400165365ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Math/BigInteger/000077500000000000000000000000001354156543400205555ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Math/BigInteger/BCMathTest.php000066400000000000000000000010621354156543400232230ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Math_BigInteger_BCMathTest extends Unit_Math_BigInteger_TestCase
{
    public static function setUpBeforeClass()
    {
        if (!extension_loaded('bcmath')) {
            self::markTestSkipped('BCMath extension is not available.');
        }

        parent::setUpBeforeClass();

        self::ensureConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_BCMATH);
    }
}
phpseclib-1.0.18/tests/Unit/Math/BigInteger/GMPTest.php000066400000000000000000000010771354156543400225560ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Math_BigInteger_GMPTest extends Unit_Math_BigInteger_TestCase
{
    public static function setUpBeforeClass()
    {
        if (!extension_loaded('gmp')) {
            self::markTestSkipped('GNU Multiple Precision (GMP) extension is not available.');
        }

        parent::setUpBeforeClass();

        self::ensureConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_GMP);
    }
}
phpseclib-1.0.18/tests/Unit/Math/BigInteger/InternalOpenSSLTest.php000066400000000000000000000011171354156543400251060ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Math_BigInteger_InternalOpenSSLTest extends Unit_Math_BigInteger_TestCase
{
    public static function setUpBeforeClass()
    {
        if (!extension_loaded('openssl')) {
            self::markTestSkipped('openssl_public_encrypt() function is not available.');
        }

        parent::setUpBeforeClass();

        self::ensureConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_INTERNAL);
    }
}
phpseclib-1.0.18/tests/Unit/Math/BigInteger/InternalTest.php000066400000000000000000000013251354156543400237030ustar00rootroot00000000000000
 * @copyright 2013 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Math_BigInteger_InternalTest extends Unit_Math_BigInteger_TestCase
{
    public static function setUpBeforeClass()
    {
        parent::setUpBeforeClass();

        self::ensureConstant('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_INTERNAL);
        self::ensureConstant('MATH_BIGINTEGER_OPENSSL_DISABLE', true);
    }

    public function testInternalRepresentation()
    {
        $x = new Math_BigInteger('FFFFFFFFFFFFFFFFC90FDA', 16);
        $y = new Math_BigInteger("$x");
        $this->assertSame($x->value, $y->value);
    }
}
phpseclib-1.0.18/tests/Unit/Math/BigInteger/TestCase.php000066400000000000000000000342361354156543400230110ustar00rootroot00000000000000
 * @copyright 2012 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Math/BigInteger.php';

abstract class Unit_Math_BigInteger_TestCase extends PhpseclibTestCase
{
    public static function setUpBeforeClass()
    {
        parent::setUpBeforeClass();

        self::reRequireFile('Math/BigInteger.php');
    }

    public function getInstance($x = 0, $base = 10)
    {
        return new Math_BigInteger($x, $base);
    }

    public function testConstructorBase2()
    {
        // 2**65 = 36893488147419103232
        $this->assertSame('36893488147419103232', (string) $this->getInstance('1' . str_repeat('0', 65), 2));
    }

    public function testConstructorBase10()
    {
        $this->assertSame('18446744073709551616', (string) $this->getInstance('18446744073709551616'));
    }

    public function testConstructorBase16()
    {
        $this->assertSame('50',                        (string) $this->getInstance('0x32', 16));
        $this->assertSame('12345678910',            (string) $this->getInstance('0x2DFDC1C3E', 16));
        $this->assertSame('18446744073709551615',    (string) $this->getInstance('0xFFFFFFFFFFFFFFFF', 16));
        $this->assertSame('18446744073709551616',    (string) $this->getInstance('0x10000000000000000', 16));
    }

    public function testToBytes()
    {
        $this->assertSame(chr(65), $this->getInstance('65')->toBytes());
    }

    public function testToBytesTwosCompliment()
    {
        $this->assertSame(chr(126), $this->getInstance('01111110', 2)->toBytes(true));
    }

    public function testToHex()
    {
        $this->assertSame('41', $this->getInstance('65')->toHex());
    }

    public function testToBits()
    {
        $this->assertSame('1000001', $this->getInstance('65')->toBits());
    }

    public function testAdd()
    {
        $x = $this->getInstance('18446744073709551615');
        $y = $this->getInstance('100000000000');

        $a = $x->add($y);
        $b = $y->add($x);

        $this->assertTrue($a->equals($b));
        $this->assertTrue($b->equals($a));

        $this->assertSame('18446744173709551615', (string) $a);
        $this->assertSame('18446744173709551615', (string) $b);
    }

    public function testSubtract()
    {
        $x = $this->getInstance('18446744073709551618');
        $y = $this->getInstance('4000000000000');
        $this->assertSame('18446740073709551618', (string) $x->subtract($y));
    }

    public function testMultiply()
    {
        $x = $this->getInstance('8589934592');                // 2**33
        $y = $this->getInstance('36893488147419103232');    // 2**65

        $a = $x->multiply($y); // 2**98
        $b = $y->multiply($x); // 2**98

        $this->assertTrue($a->equals($b));
        $this->assertTrue($b->equals($a));

        $this->assertSame('316912650057057350374175801344', (string) $a);
        $this->assertSame('316912650057057350374175801344', (string) $b);
    }

    public function testDivide()
    {
        $x = $this->getInstance('1180591620717411303425');    // 2**70 + 1
        $y = $this->getInstance('12345678910');

        list($q, $r) = $x->divide($y);

        $this->assertSame('95627922070', (string) $q);
        $this->assertSame('10688759725', (string) $r);

        $x = $this->getInstance('3369993333393829974333376885877453834204643052817571560137951281152');
        $y = $this->getInstance('4294967296');

        list($q, $r) = $x->divide($y);

        $this->assertSame('784637716923335095479473677900958302012794430558004314112', (string) $q);
        $this->assertSame('0', (string) $r);

        $x = $this->getInstance('3369993333393829974333376885877453834204643052817571560137951281153');
        $y = $this->getInstance('4294967296');

        list($q, $r) = $x->divide($y);

        $this->assertSame('784637716923335095479473677900958302012794430558004314112', (string) $q);
        $this->assertSame('1', (string) $r);
    }

    public function testModPow()
    {
        $a = $this->getInstance('10');
        $b = $this->getInstance('20');
        $c = $this->getInstance('30');
        $d = $a->modPow($b, $c);

        $this->assertSame('10', (string) $d);
    }

    public function testModInverse()
    {
        $a = $this->getInstance(30);
        $b = $this->getInstance(17);

        $c = $a->modInverse($b);
        $this->assertSame('4', (string) $c);

        $d = $a->multiply($c);
        list($q, $r) = $d->divide($b);
        $this->assertSame('1', (string) $r);
    }

    public function testExtendedGCD()
    {
        $a = $this->getInstance(693);
        $b = $this->getInstance(609);

        $arr = $a->extendedGCD($b);

        $this->assertSame('21', (string) $arr['gcd']);
        $this->assertSame(21, $a->toString() * $arr['x']->toString() + $b->toString() * $arr['y']->toString());
    }

    public function testGCD()
    {
        $x = $this->getInstance(693);
        $y = $this->getInstance(609);
        $this->assertSame('21', (string) $x->gcd($y));
    }

    public function testAbs()
    {
        $x = $this->getInstance('-18446744073709551617');
        $y = $x->abs();

        $this->assertSame('-18446744073709551617', (string) $x);
        $this->assertSame('18446744073709551617', (string) $y);
    }

    public function testEquals()
    {
        $x = $this->getInstance('18446744073709551616');
        $y = $this->getInstance('18446744073709551616');

        $this->assertTrue($x->equals($y));
        $this->assertTrue($y->equals($x));
    }

    public function testCompare()
    {
        $a = $this->getInstance('-18446744073709551616');
        $b = $this->getInstance('36893488147419103232');
        $c = $this->getInstance('36893488147419103232');
        $d = $this->getInstance('316912650057057350374175801344');

        // a < b
        $this->assertLessThan(0, $a->compare($b));
        $this->assertGreaterThan(0, $b->compare($a));

        // b = c
        $this->assertSame(0, $b->compare($c));
        $this->assertSame(0, $c->compare($b));

        // c < d
        $this->assertLessThan(0, $c->compare($d));
        $this->assertGreaterThan(0, $d->compare($c));

        $this->assertSame(-1, $this->getInstance(-999)->compare($this->getInstance(370)));
        $this->assertSame(1, $this->getInstance(999)->compare($this->getInstance(-700)));
    }

    public function testBitwiseAND()
    {
        $x = $this->getInstance('66666666666666666666666', 16);
        $y = $this->getInstance('33333333333333333333333', 16);
        $z = $this->getInstance('22222222222222222222222', 16);

        $this->assertSame($z->toHex(), $x->bitwise_AND($y)->toHex());
    }

    public function testBitwiseOR()
    {
        $x = $this->getInstance('11111111111111111111111', 16);
        $y = $this->getInstance('EEEEEEEEEEEEEEEEEEEEEEE', 16);
        $z = $this->getInstance('FFFFFFFFFFFFFFFFFFFFFFF', 16);

        $this->assertSame($z->toHex(), $x->bitwise_OR($y)->toHex());
    }

    public function testBitwiseXOR()
    {
        $x = $this->getInstance('AFAFAFAFAFAFAFAFAFAFAFAF', 16);
        $y = $this->getInstance('133713371337133713371337', 16);
        $z = $this->getInstance('BC98BC98BC98BC98BC98BC98', 16);

        $this->assertSame($z->toHex(), $x->bitwise_XOR($y)->toHex());

        // @group github1245

        $a = $this->getInstance(1);
        $b = $this->getInstance(-2);
        $c = $a->bitwise_xor($b);
        $this->assertSame("$c", '3');

        $a = $this->getInstance('-6725760161961546982');
        $b = $this->getInstance(51);
        $c = $a->bitwise_xor($b);
        $this->assertSame("$c", '6725760161961546965');
    }

    public function testBitwiseNOT()
    {
        $x = $this->getInstance('EEEEEEEEEEEEEEEEEEEEEEE', 16);
        $z = $this->getInstance('11111111111111111111111', 16);

        $this->assertSame($z->toHex(), $x->bitwise_NOT()->toHex());

        $a = $this->getInstance(0);
        $a->bitwise_not();

        $this->assertSame($a->toString(), '0');
    }

    public function testBitwiseLeftShift()
    {
        $x = $this->getInstance('0x0000000FF0000000', 16);
        $y = $this->getInstance('0x000FF00000000000', 16);

        $this->assertSame($y->toHex(), $x->bitwise_LeftShift(16)->toHex());
    }

    public function testBitwiseRightShift()
    {
        $x = $this->getInstance('0x0000000FF0000000', 16);
        $y = $this->getInstance('0x00000000000FF000', 16);
        $z = $this->getInstance('0x000000000000000F', 16);
        $n = $this->getInstance(0);

        $this->assertSame($y->toHex(), $x->bitwise_RightShift(16)->toHex());
        $this->assertSame($z->toHex(), $x->bitwise_RightShift(32)->toHex());
        $this->assertSame($n->toHex(), $x->bitwise_RightShift(36)->toHex());
    }

    public function testSerializable()
    {
        $x = $this->getInstance('18446744073709551616');
        $y = unserialize(serialize($x));

        $this->assertTrue($x->equals($y));
        $this->assertTrue($y->equals($x));

        $this->assertSame('18446744073709551616', (string) $x);
        $this->assertSame('18446744073709551616', (string) $y);
    }

    public function testClone()
    {
        $x = $this->getInstance('18446744073709551616');
        $y = clone $x;

        $this->assertTrue($x->equals($y));
        $this->assertTrue($y->equals($x));

        $this->assertSame('18446744073709551616', (string) $x);
        $this->assertSame('18446744073709551616', (string) $y);
    }

    public function testRandomTwoArgument()
    {
        $min = $this->getInstance(0);
        $max = $this->getInstance('18446744073709551616');

        $rand1 = $min->random($min, $max);
        // technically $rand1 can equal $min but with the $min and $max we've
        // chosen it's just not that likely
        $this->assertTrue($rand1->compare($min) > 0);
        $this->assertTrue($rand1->compare($max) < 0);
    }

    public function testRandomOneArgument()
    {
        $min = $this->getInstance(0);
        $max = $this->getInstance('18446744073709551616');

        $rand1 = $min->random($max);
        $this->assertTrue($rand1->compare($min) > 0);
        $this->assertTrue($rand1->compare($max) < 0);

        $rand2 = $max->random($min);
        $this->assertTrue($rand2->compare($min) > 0);
        $this->assertTrue($rand2->compare($max) < 0);

        $this->assertFalse($rand1->equals($rand2));
    }

    /**
     * @group github279
     */
    public function testDiffieHellmanKeyAgreement()
    {
        if (getenv('TRAVIS') && PHP_VERSION === '5.3.3'
            && MATH_BIGINTEGER_MODE === MATH_BIGINTEGER_MODE_INTERNAL
        ) {
            $this->markTestIncomplete(
                'This test hangs on PHP 5.3.3 using internal mode.'
            );
        }

        // "Oakley Group 14" 2048-bit modular exponentiation group as used in
        // SSH2 diffie-hellman-group14-sha1
        $prime = $this->getInstance(
            'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1' .
            '29024E088A67CC74020BBEA63B139B22514A08798E3404DD' .
            'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245' .
            'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
            'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D' .
            'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F' .
            '83655D23DCA3AD961C62F356208552BB9ED529077096966D' .
            '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
            'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9' .
            'DE2BCBF6955817183995497CEA956AE515D2261898FA0510' .
            '15728E5A8AACAA68FFFFFFFFFFFFFFFF',
            16
        );
        $generator = $this->getInstance(2);

        /*
        Code for generation of $alicePrivate and $bobPrivate.
        $one = $this->getInstance(1);
        $max = $one->bitwise_leftShift(512)->subtract($one);
        $alicePrivate = $one->random($one, $max);
        $bobPrivate = $one->random($one, $max);
        var_dump($alicePrivate->toHex(), $bobPrivate->toHex());
        */

        $alicePrivate = $this->getInstance(
            '22606EDA7960458BC9D65F46DD96F114F9A004F0493C1F26' .
            '2139D2C8063B733162E876182CA3BF063AB1A167ABDB7F03' .
            'E0A225A6205660439F6CE46D252069FF',
            16
        );
        $bobPrivate = $this->getInstance(
            '6E3EFA13A96025D63E4B0D88A09B3A46DDFE9DD3BC9D1655' .
            '4898C02B4AC181F0CEB4E818664B12F02C71A07215C400F9' .
            '88352A4779F3E88836F7C3D3B3C739DE',
            16
        );

        $alicePublic = $generator->modPow($alicePrivate, $prime);
        $bobPublic =  $generator->modPow($bobPrivate, $prime);

        $aliceShared = $bobPublic->modPow($alicePrivate, $prime);
        $bobShared = $alicePublic->modPow($bobPrivate, $prime);

        $this->assertTrue(
            $aliceShared->equals($bobShared),
            'Failed asserting that Alice and Bob share the same BigInteger.'
        );
    }

    /**
     * @requires PHP 5.6
     */
    public function testDebugInfo()
    {
        $num = $this->getInstance(50);
        $str = print_r($num, true);
        $this->assertContains('[value] => 0x32', $str);
        return $str;
    }

    /**
     * @group github954
     */
    public function testSlidingWindow()
    {
        $e = $this->getInstance(str_repeat('1', 1794), 2);
        $x = $this->getInstance(1);
        $n = $this->getInstance(2);
        $x->powMod($e, $n);
    }

    /**
     * @group github1264
     */
    public function test48ToHex()
    {
        $temp = $this->getInstance(48);
        $this->assertSame($temp->toHex(true), '30');
    }

    public function testZeroBase10()
    {
        $temp = $this->getInstance('00');
        $this->assertSame($temp->toString(), '0');

        $temp = $this->getInstance('-0');
        $this->assertSame($temp->toString(), '0');
    }

    public function testNegativePrecision()
    {
        $vals = [
            '-9223372036854775808', // eg. 8000 0000 0000 0000
            '-1'
        ];
        foreach ($vals as $val) {
            $x = $this->getInstance($val);
            $x->setPrecision(64); // ie. 8 bytes
            $this->assertSame($val, "$x");
            $r = $x->toBytes(true);
            $this->assertSame(8, strlen($r));
            $x2 = $this->getInstance($r, -256);
            $this->assertSame(0, $x->compare($x2));
        }
    }
}
phpseclib-1.0.18/tests/Unit/Net/000077500000000000000000000000001354156543400163735ustar00rootroot00000000000000phpseclib-1.0.18/tests/Unit/Net/SFTPStreamTest.php000066400000000000000000000015531354156543400217000ustar00rootroot00000000000000
 * @copyright 2014 Andreas Fischer
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

require_once 'Net/SFTP/Stream.php';

class Unit_Net_SFTPStreamTest extends PhpseclibTestCase
{
    protected $protocol = 'sftptest';

    public function setUp()
    {
        parent::setUp();
        if (in_array($this->protocol, stream_get_wrappers())) {
            stream_wrapper_unregister($this->protocol);
        }
    }

    public function testRegisterFromSideEffect()
    {
        // Including the file registers 'sftp' as a stream.
        $this->assertContains('sftp', stream_get_wrappers());
    }

    public function testRegisterWithArgument()
    {
        Net_SFTP_Stream::register($this->protocol);
        $this->assertContains($this->protocol, stream_get_wrappers());
    }
}
phpseclib-1.0.18/tests/Unit/Net/SSH1Test.php000066400000000000000000000023651354156543400204700ustar00rootroot00000000000000
 * @copyright 2013 Marc Scholten
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Net_SSH1Test extends PhpseclibTestCase
{
    public function formatLogDataProvider()
    {
        return array(
            array(
                array('hello world'),
                array('<--'),
                "<--\r\n00000000  68:65:6c:6c:6f:20:77:6f:72:6c:64                 hello world\r\n\r\n"
            ),
            array(
                array('hello', 'world'),
                array('<--', '<--'),
                "<--\r\n00000000  68:65:6c:6c:6f                                   hello\r\n\r\n" .
                "<--\r\n00000000  77:6f:72:6c:64                                   world\r\n\r\n"
            ),
        );
    }

    /**
     * @dataProvider formatLogDataProvider
     */
    public function testFormatLog(array $message_log, array $message_number_log, $expected)
    {
        $ssh = $this->getMockBuilder('Net_SSH1')
            ->disableOriginalConstructor()
            ->setMethods(null)
            ->getMock();

        $result = $ssh->_format_log($message_log, $message_number_log);

        $this->assertEquals($expected, $result);
    }
}
phpseclib-1.0.18/tests/Unit/Net/SSH2Test.php000066400000000000000000000067321354156543400204730ustar00rootroot00000000000000
 * @copyright 2013 Marc Scholten
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 */

class Unit_Net_SSH2Test extends PhpseclibTestCase
{
    public function formatLogDataProvider()
    {
        return array(
            array(
                array('hello world'),
                array('<--'),
                "<--\r\n00000000  68:65:6c:6c:6f:20:77:6f:72:6c:64                 hello world\r\n\r\n"
            ),
            array(
                array('hello', 'world'),
                array('<--', '<--'),
                "<--\r\n00000000  68:65:6c:6c:6f                                   hello\r\n\r\n" .
                "<--\r\n00000000  77:6f:72:6c:64                                   world\r\n\r\n"
            ),
        );
    }

    /**
     * @dataProvider formatLogDataProvider
     */
    public function testFormatLog(array $message_log, array $message_number_log, $expected)
    {
        $ssh = $this->createSSHMock();

        $result = $ssh->_format_log($message_log, $message_number_log);
        $this->assertEquals($expected, $result);
    }

    public function testGenerateIdentifier()
    {
        $identifier = $this->createSSHMock()->_generate_identifier();
        $this->assertStringStartsWith('SSH-2.0-phpseclib_1.0', $identifier);

        if (extension_loaded('openssl')) {
            $this->assertContains('openssl', $identifier);
            $this->assertNotContains('mcrypt', $identifier);
        } elseif (extension_loaded('mcrypt')) {
            $this->assertNotContains('openssl', $identifier);
            $this->assertContains('mcrypt', $identifier);
        } else {
            $this->assertNotContains('openssl', $identifier);
            $this->assertNotContains('mcrypt', $identifier);
        }

        if (extension_loaded('gmp')) {
            $this->assertContains('gmp', $identifier);
            $this->assertNotContains('bcmath', $identifier);
        } elseif (extension_loaded('bcmath')) {
            $this->assertNotContains('gmp', $identifier);
            $this->assertContains('bcmath', $identifier);
        } else {
            $this->assertNotContains('gmp', $identifier);
            $this->assertNotContains('bcmath', $identifier);
        }
    }

    public function testGetExitStatusIfNotConnected()
    {
        $ssh = $this->createSSHMock();

        $this->assertFalse($ssh->getExitStatus());
    }

    public function testPTYIDefaultValue()
    {
        $ssh = $this->createSSHMock();
        $this->assertFalse($ssh->isPTYEnabled());
    }

    public function testEnablePTY()
    {
        $ssh = $this->createSSHMock();

        $ssh->enablePTY();
        $this->assertTrue($ssh->isPTYEnabled());

        $ssh->disablePTY();
        $this->assertFalse($ssh->isPTYEnabled());
    }

    public function testQuietModeDefaultValue()
    {
        $ssh = $this->createSSHMock();

        $this->assertFalse($ssh->isQuietModeEnabled());
    }

    public function testEnableQuietMode()
    {
        $ssh = $this->createSSHMock();

        $ssh->enableQuietMode();
        $this->assertTrue($ssh->isQuietModeEnabled());

        $ssh->disableQuietMode();
        $this->assertFalse($ssh->isQuietModeEnabled());
    }

    /**
     * @return Net_SSH2
     */
    protected function createSSHMock()
    {
        return $this->getMockBuilder('Net_SSH2')
            ->disableOriginalConstructor()
            ->setMethods(array('__destruct'))
            ->getMock();
    }
}
phpseclib-1.0.18/tests/bootstrap.php000066400000000000000000000010051354156543400174500ustar00rootroot00000000000000add('', __DIR__);
phpseclib-1.0.18/travis/000077500000000000000000000000001354156543400150745ustar00rootroot00000000000000phpseclib-1.0.18/travis/code_coverage_id_rsa000066400000000000000000000033461354156543400211330ustar00rootroot00000000000000-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,2F15FCF0B21FCFB5A37D709322F9B9EB
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-----END RSA PRIVATE KEY-----
phpseclib-1.0.18/travis/install-php-extensions.sh000077500000000000000000000010251354156543400220610ustar00rootroot00000000000000#!/bin/bash
#
# This file is part of the phpseclib project.
#
# (c) Andreas Fischer 
#
# For the full copyright and license information, please view the LICENSE
# file that was distributed with this source code.
#
set -e

function install_php_extension
{
    cd "$1"
    phpize
    ./configure
    make
    make install
    cd ..
    echo "extension=$1.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`
}

# runkit
git clone https://github.com/zenovich/runkit.git
install_php_extension 'runkit'
phpseclib-1.0.18/travis/run-phpunit.sh000077500000000000000000000015751354156543400177340ustar00rootroot00000000000000#!/bin/sh
set -e
set -x

export PHPSECLIB_SSH_HOSTNAME='localhost'
export PHPSECLIB_SSH_USERNAME='phpseclib'
export PHPSECLIB_SSH_PASSWORD='EePoov8po1aethu2kied1ne0'
export PHPSECLIB_SSH_HOME='/home/phpseclib'

if [ "$TRAVIS_PHP_VERSION" = '5.2' ]
then
  PHPUNIT="phpunit"
else
  PHPUNIT="$(dirname "$0")/../vendor/bin/phpunit"
fi

PHPUNIT_ARGS='--verbose'
if [ `php -r "echo (int) version_compare(PHP_VERSION, '5.4', '<');"` = "1" ]
then
  PHPUNIT_ARGS="$PHPUNIT_ARGS -d zend.enable_gc=0"
fi

if [ "$TRAVIS_PHP_VERSION" = 'hhvm' -o `php -r "echo (int) version_compare(PHP_VERSION, '7.0', '>=');"` = "1" ]
then
  find tests -type f -name "*Test.php" | \
    parallel --gnu --keep-order \
      "echo '== {} =='; \"$PHPUNIT\" $PHPUNIT_ARGS {};"
else
  "$PHPUNIT" \
    $PHPUNIT_ARGS \
    --coverage-text \
    --coverage-clover code_coverage/clover.xml \
    --coverage-html code_coverage/
fi
phpseclib-1.0.18/travis/setup-composer.sh000077500000000000000000000001221354156543400204130ustar00rootroot00000000000000#!/bin/sh
composer self-update --no-interaction
composer install --no-interaction
phpseclib-1.0.18/travis/setup-secure-shell.sh000077500000000000000000000020411354156543400211610ustar00rootroot00000000000000#!/bin/sh
#
# This file is part of the phpseclib project.
#
# (c) Andreas Fischer 
#
# For the full copyright and license information, please view the LICENSE
# file that was distributed with this source code.
#
set -e
set -x

USERNAME='phpseclib'
PASSWORD='EePoov8po1aethu2kied1ne0'

# Create phpseclib user and home directory
sudo useradd --create-home --base-dir /home "$USERNAME"

# Set phpseclib user password
echo "$USERNAME:$PASSWORD" | sudo chpasswd

# Create a 1024 bit RSA SSH key pair without passphrase for the travis user
ssh-keygen -t rsa -b 1024 -f "$HOME/.ssh/id_rsa" -q -N ""

# Add the generated private key to SSH agent of travis user
ssh-add "$HOME/.ssh/id_rsa"

# Allow the private key of the travis user to log in as phpseclib user
sudo mkdir -p "/home/$USERNAME/.ssh/"
sudo cp "$HOME/.ssh/id_rsa.pub" "/home/$USERNAME/.ssh/authorized_keys"
sudo ssh-keyscan -t rsa localhost > "/tmp/known_hosts"
sudo cp "/tmp/known_hosts" "/home/$USERNAME/.ssh/known_hosts"
sudo chown "$USERNAME:$USERNAME" "/home/$USERNAME/.ssh/" -R
phpseclib-1.0.18/travis/upload-code-coverage-html.sh000077500000000000000000000024101354156543400223570ustar00rootroot00000000000000#!/bin/sh
#
# This file is part of the phpseclib project.
#
# (c) Andreas Fischer 
#
# For the full copyright and license information, please view the LICENSE
# file that was distributed with this source code.
#

USERNAME='phpseclib'
HOSTNAME='phpseclib.bantux.org'
HOSTRSAF='09:40:96:14:6a:cd:67:46:17:e5:b4:39:24:24:6e:9d'
LDIRNAME='code_coverage'
RDIRNAME='code_coverage'
ID_RSA='travis/code_coverage_id_rsa'

# Install expect if necessary
if ! which expect > /dev/null
then
	sudo apt-get update -qq
	sudo apt-get install -qq expect
fi

# Workaround for rsync not creating target directories with depth > 1
mv "$LDIRNAME" "x$LDIRNAME"
RROOT="$RDIRNAME/$TRAVIS_BRANCH/$TRAVIS_BUILD_NUMBER"
mkdir -p "$RROOT"
mv "x$LDIRNAME" "$RROOT/PHP-$TRAVIS_PHP_VERSION/"

# Update latest symlink
ln -s "$TRAVIS_BUILD_NUMBER" "$RDIRNAME/$TRAVIS_BRANCH/latest"

# Stop complaints about world-readable key file.
chmod 600 "$ID_RSA"

export RSYNC_RSH="ssh -4 -i $ID_RSA -o ConnectTimeout=5"
RSYNC_OPT="--recursive --times --links --progress"

expect << EOF
	spawn rsync $RSYNC_OPT "$RDIRNAME/" "$USERNAME@$HOSTNAME:$RDIRNAME/"

	expect "RSA key fingerprint is $HOSTRSAF."
	send "yes\n"

	expect "Enter passphrase for key '$ID_RSA':"
	send "$CODE_COVERAGE_PASSPHRASE\n"

	expect eof
EOF