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<?php
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/**
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* Base Class for all \phpseclib\Crypt\* cipher classes
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*
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* PHP version 5
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*
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* Internally for phpseclib developers:
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* If you plan to add a new cipher class, please note following rules:
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*
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* - The new \phpseclib\Crypt\* cipher class should extend \phpseclib\Crypt\Base
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*
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* - Following methods are then required to be overridden/overloaded:
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*
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* - _encryptBlock()
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*
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* - _decryptBlock()
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*
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* - _setupKey()
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*
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* - All other methods are optional to be overridden/overloaded
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*
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* - Look at the source code of the current ciphers how they extend \phpseclib\Crypt\Base
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* and take one of them as a start up for the new cipher class.
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*
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* - Please read all the other comments/notes/hints here also for each class var/method
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*
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* @category Crypt
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* @package Base
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* @author Jim Wigginton <terrafrost@php.net>
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* @author Hans-Juergen Petrich <petrich@tronic-media.com>
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* @copyright 2007 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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namespace phpseclib\Crypt;
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/**
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* Base Class for all \phpseclib\Crypt\* cipher classes
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*
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* @package Base
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* @author Jim Wigginton <terrafrost@php.net>
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* @author Hans-Juergen Petrich <petrich@tronic-media.com>
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*/
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abstract class Base
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{
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/**#@+
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* @access public
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* @see \phpseclib\Crypt\Base::encrypt()
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* @see \phpseclib\Crypt\Base::decrypt()
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*/
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/**
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* Encrypt / decrypt using the Counter mode.
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*
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* Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
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*
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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
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*/
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const MODE_CTR = -1;
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/**
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* Encrypt / decrypt using the Electronic Code Book mode.
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*
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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
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*/
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const MODE_ECB = 1;
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/**
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* Encrypt / decrypt using the Code Book Chaining mode.
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*
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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
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*/
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const MODE_CBC = 2;
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/**
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* Encrypt / decrypt using the Cipher Feedback mode.
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*
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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
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*/
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const MODE_CFB = 3;
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/**
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* Encrypt / decrypt using the Output Feedback mode.
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*
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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
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*/
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const MODE_OFB = 4;
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/**
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* Encrypt / decrypt using streaming mode.
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*/
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const MODE_STREAM = 5;
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/**#@-*/
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/**
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* Whirlpool available flag
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*
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* @see \phpseclib\Crypt\Base::_hashInlineCryptFunction()
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* @var bool
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* @access private
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*/
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static $WHIRLPOOL_AVAILABLE;
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/**#@+
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* @access private
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* @see \phpseclib\Crypt\Base::__construct()
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*/
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/**
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* Base value for the internal implementation $engine switch
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*/
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const ENGINE_INTERNAL = 1;
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/**
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* Base value for the mcrypt implementation $engine switch
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*/
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const ENGINE_MCRYPT = 2;
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/**
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* Base value for the mcrypt implementation $engine switch
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*/
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const ENGINE_OPENSSL = 3;
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/**#@-*/
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/**
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* The Encryption Mode
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*
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* @see self::__construct()
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* @var int
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* @access private
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*/
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var $mode;
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/**
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* The Block Length of the block cipher
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*
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* @var int
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* @access private
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*/
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var $block_size = 16;
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/**
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* The Key
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*
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* @see self::setKey()
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* @var string
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* @access private
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*/
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var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
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/**
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* The Initialization Vector
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*
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* @see self::setIV()
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* @var string
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* @access private
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*/
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var $iv;
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/**
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* A "sliding" Initialization Vector
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*
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* @see self::enableContinuousBuffer()
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* @see self::_clearBuffers()
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* @var string
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* @access private
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*/
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var $encryptIV;
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/**
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* A "sliding" Initialization Vector
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*
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* @see self::enableContinuousBuffer()
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* @see self::_clearBuffers()
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* @var string
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* @access private
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*/
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var $decryptIV;
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/**
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* Continuous Buffer status
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*
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* @see self::enableContinuousBuffer()
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* @var bool
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* @access private
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*/
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var $continuousBuffer = false;
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/**
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* Encryption buffer for CTR, OFB and CFB modes
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*
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* @see self::encrypt()
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* @see self::_clearBuffers()
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* @var array
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* @access private
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*/
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var $enbuffer;
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/**
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* Decryption buffer for CTR, OFB and CFB modes
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*
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* @see self::decrypt()
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* @see self::_clearBuffers()
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* @var array
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* @access private
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*/
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var $debuffer;
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/**
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* mcrypt resource for encryption
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*
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* The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
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* Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
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*
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* @see self::encrypt()
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* @var resource
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* @access private
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*/
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var $enmcrypt;
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/**
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* mcrypt resource for decryption
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*
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* The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
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* Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
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*
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* @see self::decrypt()
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* @var resource
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* @access private
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*/
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var $demcrypt;
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/**
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* Does the enmcrypt resource need to be (re)initialized?
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*
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* @see \phpseclib\Crypt\Twofish::setKey()
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* @see \phpseclib\Crypt\Twofish::setIV()
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* @var bool
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* @access private
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*/
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var $enchanged = true;
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/**
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* Does the demcrypt resource need to be (re)initialized?
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*
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* @see \phpseclib\Crypt\Twofish::setKey()
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* @see \phpseclib\Crypt\Twofish::setIV()
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* @var bool
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* @access private
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*/
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var $dechanged = true;
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/**
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* mcrypt resource for CFB mode
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*
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* mcrypt's CFB mode, in (and only in) buffered context,
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* is broken, so phpseclib implements the CFB mode by it self,
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* even when the mcrypt php extension is available.
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*
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* In order to do the CFB-mode work (fast) phpseclib
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* use a separate ECB-mode mcrypt resource.
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*
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* @link http://phpseclib.sourceforge.net/cfb-demo.phps
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* @see self::encrypt()
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* @see self::decrypt()
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* @see self::_setupMcrypt()
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* @var resource
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* @access private
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*/
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var $ecb;
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/**
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* Optimizing value while CFB-encrypting
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*
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* Only relevant if $continuousBuffer enabled
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* and $engine == self::ENGINE_MCRYPT
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*
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* It's faster to re-init $enmcrypt if
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* $buffer bytes > $cfb_init_len than
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* using the $ecb resource furthermore.
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*
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* This value depends of the chosen cipher
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* and the time it would be needed for it's
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* initialization [by mcrypt_generic_init()]
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* which, typically, depends on the complexity
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* on its internaly Key-expanding algorithm.
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*
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* @see self::encrypt()
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* @var int
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* @access private
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*/
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var $cfb_init_len = 600;
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/**
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* Does internal cipher state need to be (re)initialized?
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*
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* @see self::setKey()
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* @see self::setIV()
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* @see self::disableContinuousBuffer()
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* @var bool
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* @access private
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*/
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var $changed = true;
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/**
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* Padding status
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*
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* @see self::enablePadding()
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* @var bool
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* @access private
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*/
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var $padding = true;
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/**
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* Is the mode one that is paddable?
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*
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* @see self::__construct()
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* @var bool
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* @access private
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*/
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var $paddable = false;
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/**
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* Holds which crypt engine internaly should be use,
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* which will be determined automatically on __construct()
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*
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* Currently available $engines are:
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* - self::ENGINE_OPENSSL (very fast, php-extension: openssl, extension_loaded('openssl') required)
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* - self::ENGINE_MCRYPT (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
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* - self::ENGINE_INTERNAL (slower, pure php-engine, no php-extension required)
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*
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* @see self::_setEngine()
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* @see self::encrypt()
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* @see self::decrypt()
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* @var int
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* @access private
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*/
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var $engine;
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/**
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* Holds the preferred crypt engine
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*
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* @see self::_setEngine()
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* @see self::setPreferredEngine()
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* @var int
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* @access private
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*/
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var $preferredEngine;
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/**
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* The mcrypt specific name of the cipher
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*
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* Only used if $engine == self::ENGINE_MCRYPT
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*
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* @link http://www.php.net/mcrypt_module_open
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* @link http://www.php.net/mcrypt_list_algorithms
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* @see self::_setupMcrypt()
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* @var string
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* @access private
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*/
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var $cipher_name_mcrypt;
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/**
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* The openssl specific name of the cipher
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*
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* Only used if $engine == self::ENGINE_OPENSSL
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*
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* @link http://www.php.net/openssl-get-cipher-methods
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* @var string
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* @access private
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*/
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var $cipher_name_openssl;
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/**
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* The openssl specific name of the cipher in ECB mode
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*
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* If OpenSSL does not support the mode we're trying to use (CTR)
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* it can still be emulated with ECB mode.
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*
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* @link http://www.php.net/openssl-get-cipher-methods
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* @var string
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* @access private
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*/
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var $cipher_name_openssl_ecb;
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/**
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* The default salt used by setPassword()
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*
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382 |
* @see self::setPassword()
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383 |
* @var string
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384 |
* @access private
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385 |
*/
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386 |
var $password_default_salt = 'phpseclib/salt';
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387 |
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388 |
/**
|
|
|
389 |
* The name of the performance-optimized callback function
|
|
|
390 |
*
|
|
|
391 |
* Used by encrypt() / decrypt()
|
|
|
392 |
* only if $engine == self::ENGINE_INTERNAL
|
|
|
393 |
*
|
|
|
394 |
* @see self::encrypt()
|
|
|
395 |
* @see self::decrypt()
|
|
|
396 |
* @see self::_setupInlineCrypt()
|
|
|
397 |
* @see self::$use_inline_crypt
|
|
|
398 |
* @var Callback
|
|
|
399 |
* @access private
|
|
|
400 |
*/
|
|
|
401 |
var $inline_crypt;
|
|
|
402 |
|
|
|
403 |
/**
|
|
|
404 |
* Holds whether performance-optimized $inline_crypt() can/should be used.
|
|
|
405 |
*
|
|
|
406 |
* @see self::encrypt()
|
|
|
407 |
* @see self::decrypt()
|
|
|
408 |
* @see self::inline_crypt
|
|
|
409 |
* @var mixed
|
|
|
410 |
* @access private
|
|
|
411 |
*/
|
|
|
412 |
var $use_inline_crypt;
|
|
|
413 |
|
|
|
414 |
/**
|
|
|
415 |
* If OpenSSL can be used in ECB but not in CTR we can emulate CTR
|
|
|
416 |
*
|
|
|
417 |
* @see self::_openssl_ctr_process()
|
|
|
418 |
* @var bool
|
|
|
419 |
* @access private
|
|
|
420 |
*/
|
|
|
421 |
var $openssl_emulate_ctr = false;
|
|
|
422 |
|
|
|
423 |
/**
|
|
|
424 |
* Determines what options are passed to openssl_encrypt/decrypt
|
|
|
425 |
*
|
|
|
426 |
* @see self::isValidEngine()
|
|
|
427 |
* @var mixed
|
|
|
428 |
* @access private
|
|
|
429 |
*/
|
|
|
430 |
var $openssl_options;
|
|
|
431 |
|
|
|
432 |
/**
|
|
|
433 |
* Has the key length explicitly been set or should it be derived from the key, itself?
|
|
|
434 |
*
|
|
|
435 |
* @see self::setKeyLength()
|
|
|
436 |
* @var bool
|
|
|
437 |
* @access private
|
|
|
438 |
*/
|
|
|
439 |
var $explicit_key_length = false;
|
|
|
440 |
|
|
|
441 |
/**
|
|
|
442 |
* Don't truncate / null pad key
|
|
|
443 |
*
|
|
|
444 |
* @see self::_clearBuffers()
|
|
|
445 |
* @var bool
|
|
|
446 |
* @access private
|
|
|
447 |
*/
|
|
|
448 |
var $skip_key_adjustment = false;
|
|
|
449 |
|
|
|
450 |
/**
|
|
|
451 |
* Default Constructor.
|
|
|
452 |
*
|
|
|
453 |
* Determines whether or not the mcrypt extension should be used.
|
|
|
454 |
*
|
|
|
455 |
* $mode could be:
|
|
|
456 |
*
|
|
|
457 |
* - self::MODE_ECB
|
|
|
458 |
*
|
|
|
459 |
* - self::MODE_CBC
|
|
|
460 |
*
|
|
|
461 |
* - self::MODE_CTR
|
|
|
462 |
*
|
|
|
463 |
* - self::MODE_CFB
|
|
|
464 |
*
|
|
|
465 |
* - self::MODE_OFB
|
|
|
466 |
*
|
|
|
467 |
* If not explicitly set, self::MODE_CBC will be used.
|
|
|
468 |
*
|
|
|
469 |
* @param int $mode
|
|
|
470 |
* @access public
|
|
|
471 |
*/
|
|
|
472 |
function __construct($mode = self::MODE_CBC)
|
|
|
473 |
{
|
|
|
474 |
// $mode dependent settings
|
|
|
475 |
switch ($mode) {
|
|
|
476 |
case self::MODE_ECB:
|
|
|
477 |
$this->paddable = true;
|
|
|
478 |
$this->mode = self::MODE_ECB;
|
|
|
479 |
break;
|
|
|
480 |
case self::MODE_CTR:
|
|
|
481 |
case self::MODE_CFB:
|
|
|
482 |
case self::MODE_OFB:
|
|
|
483 |
case self::MODE_STREAM:
|
|
|
484 |
$this->mode = $mode;
|
|
|
485 |
break;
|
|
|
486 |
case self::MODE_CBC:
|
|
|
487 |
default:
|
|
|
488 |
$this->paddable = true;
|
|
|
489 |
$this->mode = self::MODE_CBC;
|
|
|
490 |
}
|
|
|
491 |
|
|
|
492 |
$this->_setEngine();
|
|
|
493 |
|
|
|
494 |
// Determining whether inline crypting can be used by the cipher
|
|
|
495 |
if ($this->use_inline_crypt !== false && function_exists('create_function')) {
|
|
|
496 |
$this->use_inline_crypt = true;
|
|
|
497 |
}
|
|
|
498 |
}
|
|
|
499 |
|
|
|
500 |
/**
|
|
|
501 |
* Sets the initialization vector. (optional)
|
|
|
502 |
*
|
|
|
503 |
* SetIV is not required when self::MODE_ECB (or ie for AES: \phpseclib\Crypt\AES::MODE_ECB) is being used. If not explicitly set, it'll be assumed
|
|
|
504 |
* to be all zero's.
|
|
|
505 |
*
|
|
|
506 |
* @access public
|
|
|
507 |
* @param string $iv
|
|
|
508 |
* @internal Can be overwritten by a sub class, but does not have to be
|
|
|
509 |
*/
|
|
|
510 |
function setIV($iv)
|
|
|
511 |
{
|
|
|
512 |
if ($this->mode == self::MODE_ECB) {
|
|
|
513 |
return;
|
|
|
514 |
}
|
|
|
515 |
|
|
|
516 |
$this->iv = $iv;
|
|
|
517 |
$this->changed = true;
|
|
|
518 |
}
|
|
|
519 |
|
|
|
520 |
/**
|
|
|
521 |
* Sets the key length.
|
|
|
522 |
*
|
|
|
523 |
* Keys with explicitly set lengths need to be treated accordingly
|
|
|
524 |
*
|
|
|
525 |
* @access public
|
|
|
526 |
* @param int $length
|
|
|
527 |
*/
|
|
|
528 |
function setKeyLength($length)
|
|
|
529 |
{
|
|
|
530 |
$this->explicit_key_length = true;
|
|
|
531 |
$this->changed = true;
|
|
|
532 |
$this->_setEngine();
|
|
|
533 |
}
|
|
|
534 |
|
|
|
535 |
/**
|
|
|
536 |
* Returns the current key length in bits
|
|
|
537 |
*
|
|
|
538 |
* @access public
|
|
|
539 |
* @return int
|
|
|
540 |
*/
|
|
|
541 |
function getKeyLength()
|
|
|
542 |
{
|
|
|
543 |
return $this->key_length << 3;
|
|
|
544 |
}
|
|
|
545 |
|
|
|
546 |
/**
|
|
|
547 |
* Returns the current block length in bits
|
|
|
548 |
*
|
|
|
549 |
* @access public
|
|
|
550 |
* @return int
|
|
|
551 |
*/
|
|
|
552 |
function getBlockLength()
|
|
|
553 |
{
|
|
|
554 |
return $this->block_size << 3;
|
|
|
555 |
}
|
|
|
556 |
|
|
|
557 |
/**
|
|
|
558 |
* Sets the key.
|
|
|
559 |
*
|
|
|
560 |
* The min/max length(s) of the key depends on the cipher which is used.
|
|
|
561 |
* If the key not fits the length(s) of the cipher it will paded with null bytes
|
|
|
562 |
* up to the closest valid key length. If the key is more than max length,
|
|
|
563 |
* we trim the excess bits.
|
|
|
564 |
*
|
|
|
565 |
* If the key is not explicitly set, it'll be assumed to be all null bytes.
|
|
|
566 |
*
|
|
|
567 |
* @access public
|
|
|
568 |
* @param string $key
|
|
|
569 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
570 |
*/
|
|
|
571 |
function setKey($key)
|
|
|
572 |
{
|
|
|
573 |
if (!$this->explicit_key_length) {
|
|
|
574 |
$this->setKeyLength(strlen($key) << 3);
|
|
|
575 |
$this->explicit_key_length = false;
|
|
|
576 |
}
|
|
|
577 |
|
|
|
578 |
$this->key = $key;
|
|
|
579 |
$this->changed = true;
|
|
|
580 |
$this->_setEngine();
|
|
|
581 |
}
|
|
|
582 |
|
|
|
583 |
/**
|
|
|
584 |
* Sets the password.
|
|
|
585 |
*
|
|
|
586 |
* Depending on what $method is set to, setPassword()'s (optional) parameters are as follows:
|
|
|
587 |
* {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2} or pbkdf1:
|
|
|
588 |
* $hash, $salt, $count, $dkLen
|
|
|
589 |
*
|
|
|
590 |
* Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
|
|
|
591 |
*
|
|
|
592 |
* @see Crypt/Hash.php
|
|
|
593 |
* @param string $password
|
|
|
594 |
* @param string $method
|
|
|
595 |
* @return bool
|
|
|
596 |
* @access public
|
|
|
597 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
598 |
*/
|
|
|
599 |
function setPassword($password, $method = 'pbkdf2')
|
|
|
600 |
{
|
|
|
601 |
$key = '';
|
|
|
602 |
|
|
|
603 |
switch ($method) {
|
|
|
604 |
default: // 'pbkdf2' or 'pbkdf1'
|
|
|
605 |
$func_args = func_get_args();
|
|
|
606 |
|
|
|
607 |
// Hash function
|
|
|
608 |
$hash = isset($func_args[2]) ? $func_args[2] : 'sha1';
|
|
|
609 |
|
|
|
610 |
// WPA and WPA2 use the SSID as the salt
|
|
|
611 |
$salt = isset($func_args[3]) ? $func_args[3] : $this->password_default_salt;
|
|
|
612 |
|
|
|
613 |
// RFC2898#section-4.2 uses 1,000 iterations by default
|
|
|
614 |
// WPA and WPA2 use 4,096.
|
|
|
615 |
$count = isset($func_args[4]) ? $func_args[4] : 1000;
|
|
|
616 |
|
|
|
617 |
// Keylength
|
|
|
618 |
if (isset($func_args[5])) {
|
|
|
619 |
$dkLen = $func_args[5];
|
|
|
620 |
} else {
|
|
|
621 |
$dkLen = $method == 'pbkdf1' ? 2 * $this->key_length : $this->key_length;
|
|
|
622 |
}
|
|
|
623 |
|
|
|
624 |
switch (true) {
|
|
|
625 |
case $method == 'pbkdf1':
|
|
|
626 |
$hashObj = new Hash();
|
|
|
627 |
$hashObj->setHash($hash);
|
|
|
628 |
if ($dkLen > $hashObj->getLength()) {
|
|
|
629 |
user_error('Derived key too long');
|
|
|
630 |
return false;
|
|
|
631 |
}
|
|
|
632 |
$t = $password . $salt;
|
|
|
633 |
for ($i = 0; $i < $count; ++$i) {
|
|
|
634 |
$t = $hashObj->hash($t);
|
|
|
635 |
}
|
|
|
636 |
$key = substr($t, 0, $dkLen);
|
|
|
637 |
|
|
|
638 |
$this->setKey(substr($key, 0, $dkLen >> 1));
|
|
|
639 |
$this->setIV(substr($key, $dkLen >> 1));
|
|
|
640 |
|
|
|
641 |
return true;
|
|
|
642 |
// Determining if php[>=5.5.0]'s hash_pbkdf2() function avail- and useable
|
|
|
643 |
case !function_exists('hash_pbkdf2'):
|
|
|
644 |
case !function_exists('hash_algos'):
|
|
|
645 |
case !in_array($hash, hash_algos()):
|
|
|
646 |
$i = 1;
|
|
|
647 |
while (strlen($key) < $dkLen) {
|
|
|
648 |
$hmac = new Hash();
|
|
|
649 |
$hmac->setHash($hash);
|
|
|
650 |
$hmac->setKey($password);
|
|
|
651 |
$f = $u = $hmac->hash($salt . pack('N', $i++));
|
|
|
652 |
for ($j = 2; $j <= $count; ++$j) {
|
|
|
653 |
$u = $hmac->hash($u);
|
|
|
654 |
$f^= $u;
|
|
|
655 |
}
|
|
|
656 |
$key.= $f;
|
|
|
657 |
}
|
|
|
658 |
$key = substr($key, 0, $dkLen);
|
|
|
659 |
break;
|
|
|
660 |
default:
|
|
|
661 |
$key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true);
|
|
|
662 |
}
|
|
|
663 |
}
|
|
|
664 |
|
|
|
665 |
$this->setKey($key);
|
|
|
666 |
|
|
|
667 |
return true;
|
|
|
668 |
}
|
|
|
669 |
|
|
|
670 |
/**
|
|
|
671 |
* Encrypts a message.
|
|
|
672 |
*
|
|
|
673 |
* $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher
|
|
|
674 |
* implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's
|
|
|
675 |
* necessary are discussed in the following
|
|
|
676 |
* URL:
|
|
|
677 |
*
|
|
|
678 |
* {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
|
|
|
679 |
*
|
|
|
680 |
* An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
|
|
|
681 |
* strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
|
|
|
682 |
* length.
|
|
|
683 |
*
|
|
|
684 |
* @see self::decrypt()
|
|
|
685 |
* @access public
|
|
|
686 |
* @param string $plaintext
|
|
|
687 |
* @return string $ciphertext
|
|
|
688 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
689 |
*/
|
|
|
690 |
function encrypt($plaintext)
|
|
|
691 |
{
|
|
|
692 |
if ($this->paddable) {
|
|
|
693 |
$plaintext = $this->_pad($plaintext);
|
|
|
694 |
}
|
|
|
695 |
|
|
|
696 |
if ($this->engine === self::ENGINE_OPENSSL) {
|
|
|
697 |
if ($this->changed) {
|
|
|
698 |
$this->_clearBuffers();
|
|
|
699 |
$this->changed = false;
|
|
|
700 |
}
|
|
|
701 |
switch ($this->mode) {
|
|
|
702 |
case self::MODE_STREAM:
|
|
|
703 |
return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
|
|
|
704 |
case self::MODE_ECB:
|
|
|
705 |
$result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
|
|
|
706 |
return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
|
|
|
707 |
case self::MODE_CBC:
|
|
|
708 |
$result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
|
|
|
709 |
if (!defined('OPENSSL_RAW_DATA')) {
|
|
|
710 |
$result = substr($result, 0, -$this->block_size);
|
|
|
711 |
}
|
|
|
712 |
if ($this->continuousBuffer) {
|
|
|
713 |
$this->encryptIV = substr($result, -$this->block_size);
|
|
|
714 |
}
|
|
|
715 |
return $result;
|
|
|
716 |
case self::MODE_CTR:
|
|
|
717 |
return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
|
|
|
718 |
case self::MODE_CFB:
|
|
|
719 |
// cfb loosely routines inspired by openssl's:
|
|
|
720 |
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
|
|
|
721 |
$ciphertext = '';
|
|
|
722 |
if ($this->continuousBuffer) {
|
|
|
723 |
$iv = &$this->encryptIV;
|
|
|
724 |
$pos = &$this->enbuffer['pos'];
|
|
|
725 |
} else {
|
|
|
726 |
$iv = $this->encryptIV;
|
|
|
727 |
$pos = 0;
|
|
|
728 |
}
|
|
|
729 |
$len = strlen($plaintext);
|
|
|
730 |
$i = 0;
|
|
|
731 |
if ($pos) {
|
|
|
732 |
$orig_pos = $pos;
|
|
|
733 |
$max = $this->block_size - $pos;
|
|
|
734 |
if ($len >= $max) {
|
|
|
735 |
$i = $max;
|
|
|
736 |
$len-= $max;
|
|
|
737 |
$pos = 0;
|
|
|
738 |
} else {
|
|
|
739 |
$i = $len;
|
|
|
740 |
$pos+= $len;
|
|
|
741 |
$len = 0;
|
|
|
742 |
}
|
|
|
743 |
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
|
744 |
$ciphertext = substr($iv, $orig_pos) ^ $plaintext;
|
|
|
745 |
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
|
|
|
746 |
$plaintext = substr($plaintext, $i);
|
|
|
747 |
}
|
|
|
748 |
|
|
|
749 |
$overflow = $len % $this->block_size;
|
|
|
750 |
|
|
|
751 |
if ($overflow) {
|
|
|
752 |
$ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
|
|
|
753 |
$iv = $this->_string_pop($ciphertext, $this->block_size);
|
|
|
754 |
|
|
|
755 |
$size = $len - $overflow;
|
|
|
756 |
$block = $iv ^ substr($plaintext, -$overflow);
|
|
|
757 |
$iv = substr_replace($iv, $block, 0, $overflow);
|
|
|
758 |
$ciphertext.= $block;
|
|
|
759 |
$pos = $overflow;
|
|
|
760 |
} elseif ($len) {
|
|
|
761 |
$ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
|
|
|
762 |
$iv = substr($ciphertext, -$this->block_size);
|
|
|
763 |
}
|
|
|
764 |
|
|
|
765 |
return $ciphertext;
|
|
|
766 |
case self::MODE_OFB:
|
|
|
767 |
return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
|
|
|
768 |
}
|
|
|
769 |
}
|
|
|
770 |
|
|
|
771 |
if ($this->engine === self::ENGINE_MCRYPT) {
|
|
|
772 |
if ($this->changed) {
|
|
|
773 |
$this->_setupMcrypt();
|
|
|
774 |
$this->changed = false;
|
|
|
775 |
}
|
|
|
776 |
if ($this->enchanged) {
|
|
|
777 |
@mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
|
|
778 |
$this->enchanged = false;
|
|
|
779 |
}
|
|
|
780 |
|
|
|
781 |
// re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
|
|
|
782 |
// using mcrypt's default handing of CFB the above would output two different things. using phpseclib's
|
|
|
783 |
// rewritten CFB implementation the above outputs the same thing twice.
|
|
|
784 |
if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
|
|
|
785 |
$block_size = $this->block_size;
|
|
|
786 |
$iv = &$this->encryptIV;
|
|
|
787 |
$pos = &$this->enbuffer['pos'];
|
|
|
788 |
$len = strlen($plaintext);
|
|
|
789 |
$ciphertext = '';
|
|
|
790 |
$i = 0;
|
|
|
791 |
if ($pos) {
|
|
|
792 |
$orig_pos = $pos;
|
|
|
793 |
$max = $block_size - $pos;
|
|
|
794 |
if ($len >= $max) {
|
|
|
795 |
$i = $max;
|
|
|
796 |
$len-= $max;
|
|
|
797 |
$pos = 0;
|
|
|
798 |
} else {
|
|
|
799 |
$i = $len;
|
|
|
800 |
$pos+= $len;
|
|
|
801 |
$len = 0;
|
|
|
802 |
}
|
|
|
803 |
$ciphertext = substr($iv, $orig_pos) ^ $plaintext;
|
|
|
804 |
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
|
|
|
805 |
$this->enbuffer['enmcrypt_init'] = true;
|
|
|
806 |
}
|
|
|
807 |
if ($len >= $block_size) {
|
|
|
808 |
if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
|
|
|
809 |
if ($this->enbuffer['enmcrypt_init'] === true) {
|
|
|
810 |
@mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
|
|
|
811 |
$this->enbuffer['enmcrypt_init'] = false;
|
|
|
812 |
}
|
|
|
813 |
$ciphertext.= @mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
|
|
|
814 |
$iv = substr($ciphertext, -$block_size);
|
|
|
815 |
$len%= $block_size;
|
|
|
816 |
} else {
|
|
|
817 |
while ($len >= $block_size) {
|
|
|
818 |
$iv = @mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
|
|
|
819 |
$ciphertext.= $iv;
|
|
|
820 |
$len-= $block_size;
|
|
|
821 |
$i+= $block_size;
|
|
|
822 |
}
|
|
|
823 |
}
|
|
|
824 |
}
|
|
|
825 |
|
|
|
826 |
if ($len) {
|
|
|
827 |
$iv = @mcrypt_generic($this->ecb, $iv);
|
|
|
828 |
$block = $iv ^ substr($plaintext, -$len);
|
|
|
829 |
$iv = substr_replace($iv, $block, 0, $len);
|
|
|
830 |
$ciphertext.= $block;
|
|
|
831 |
$pos = $len;
|
|
|
832 |
}
|
|
|
833 |
|
|
|
834 |
return $ciphertext;
|
|
|
835 |
}
|
|
|
836 |
|
|
|
837 |
$ciphertext = @mcrypt_generic($this->enmcrypt, $plaintext);
|
|
|
838 |
|
|
|
839 |
if (!$this->continuousBuffer) {
|
|
|
840 |
@mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
|
|
841 |
}
|
|
|
842 |
|
|
|
843 |
return $ciphertext;
|
|
|
844 |
}
|
|
|
845 |
|
|
|
846 |
if ($this->changed) {
|
|
|
847 |
$this->_setup();
|
|
|
848 |
$this->changed = false;
|
|
|
849 |
}
|
|
|
850 |
if ($this->use_inline_crypt) {
|
|
|
851 |
$inline = $this->inline_crypt;
|
|
|
852 |
return $inline('encrypt', $this, $plaintext);
|
|
|
853 |
}
|
|
|
854 |
|
|
|
855 |
$buffer = &$this->enbuffer;
|
|
|
856 |
$block_size = $this->block_size;
|
|
|
857 |
$ciphertext = '';
|
|
|
858 |
switch ($this->mode) {
|
|
|
859 |
case self::MODE_ECB:
|
|
|
860 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
861 |
$ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
|
|
|
862 |
}
|
|
|
863 |
break;
|
|
|
864 |
case self::MODE_CBC:
|
|
|
865 |
$xor = $this->encryptIV;
|
|
|
866 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
867 |
$block = substr($plaintext, $i, $block_size);
|
|
|
868 |
$block = $this->_encryptBlock($block ^ $xor);
|
|
|
869 |
$xor = $block;
|
|
|
870 |
$ciphertext.= $block;
|
|
|
871 |
}
|
|
|
872 |
if ($this->continuousBuffer) {
|
|
|
873 |
$this->encryptIV = $xor;
|
|
|
874 |
}
|
|
|
875 |
break;
|
|
|
876 |
case self::MODE_CTR:
|
|
|
877 |
$xor = $this->encryptIV;
|
|
|
878 |
if (strlen($buffer['ciphertext'])) {
|
|
|
879 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
880 |
$block = substr($plaintext, $i, $block_size);
|
|
|
881 |
if (strlen($block) > strlen($buffer['ciphertext'])) {
|
|
|
882 |
$buffer['ciphertext'].= $this->_encryptBlock($xor);
|
|
|
883 |
}
|
|
|
884 |
$this->_increment_str($xor);
|
|
|
885 |
$key = $this->_string_shift($buffer['ciphertext'], $block_size);
|
|
|
886 |
$ciphertext.= $block ^ $key;
|
|
|
887 |
}
|
|
|
888 |
} else {
|
|
|
889 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
890 |
$block = substr($plaintext, $i, $block_size);
|
|
|
891 |
$key = $this->_encryptBlock($xor);
|
|
|
892 |
$this->_increment_str($xor);
|
|
|
893 |
$ciphertext.= $block ^ $key;
|
|
|
894 |
}
|
|
|
895 |
}
|
|
|
896 |
if ($this->continuousBuffer) {
|
|
|
897 |
$this->encryptIV = $xor;
|
|
|
898 |
if ($start = strlen($plaintext) % $block_size) {
|
|
|
899 |
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
|
|
|
900 |
}
|
|
|
901 |
}
|
|
|
902 |
break;
|
|
|
903 |
case self::MODE_CFB:
|
|
|
904 |
// cfb loosely routines inspired by openssl's:
|
|
|
905 |
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
|
|
|
906 |
if ($this->continuousBuffer) {
|
|
|
907 |
$iv = &$this->encryptIV;
|
|
|
908 |
$pos = &$buffer['pos'];
|
|
|
909 |
} else {
|
|
|
910 |
$iv = $this->encryptIV;
|
|
|
911 |
$pos = 0;
|
|
|
912 |
}
|
|
|
913 |
$len = strlen($plaintext);
|
|
|
914 |
$i = 0;
|
|
|
915 |
if ($pos) {
|
|
|
916 |
$orig_pos = $pos;
|
|
|
917 |
$max = $block_size - $pos;
|
|
|
918 |
if ($len >= $max) {
|
|
|
919 |
$i = $max;
|
|
|
920 |
$len-= $max;
|
|
|
921 |
$pos = 0;
|
|
|
922 |
} else {
|
|
|
923 |
$i = $len;
|
|
|
924 |
$pos+= $len;
|
|
|
925 |
$len = 0;
|
|
|
926 |
}
|
|
|
927 |
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
|
928 |
$ciphertext = substr($iv, $orig_pos) ^ $plaintext;
|
|
|
929 |
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
|
|
|
930 |
}
|
|
|
931 |
while ($len >= $block_size) {
|
|
|
932 |
$iv = $this->_encryptBlock($iv) ^ substr($plaintext, $i, $block_size);
|
|
|
933 |
$ciphertext.= $iv;
|
|
|
934 |
$len-= $block_size;
|
|
|
935 |
$i+= $block_size;
|
|
|
936 |
}
|
|
|
937 |
if ($len) {
|
|
|
938 |
$iv = $this->_encryptBlock($iv);
|
|
|
939 |
$block = $iv ^ substr($plaintext, $i);
|
|
|
940 |
$iv = substr_replace($iv, $block, 0, $len);
|
|
|
941 |
$ciphertext.= $block;
|
|
|
942 |
$pos = $len;
|
|
|
943 |
}
|
|
|
944 |
break;
|
|
|
945 |
case self::MODE_OFB:
|
|
|
946 |
$xor = $this->encryptIV;
|
|
|
947 |
if (strlen($buffer['xor'])) {
|
|
|
948 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
949 |
$block = substr($plaintext, $i, $block_size);
|
|
|
950 |
if (strlen($block) > strlen($buffer['xor'])) {
|
|
|
951 |
$xor = $this->_encryptBlock($xor);
|
|
|
952 |
$buffer['xor'].= $xor;
|
|
|
953 |
}
|
|
|
954 |
$key = $this->_string_shift($buffer['xor'], $block_size);
|
|
|
955 |
$ciphertext.= $block ^ $key;
|
|
|
956 |
}
|
|
|
957 |
} else {
|
|
|
958 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
959 |
$xor = $this->_encryptBlock($xor);
|
|
|
960 |
$ciphertext.= substr($plaintext, $i, $block_size) ^ $xor;
|
|
|
961 |
}
|
|
|
962 |
$key = $xor;
|
|
|
963 |
}
|
|
|
964 |
if ($this->continuousBuffer) {
|
|
|
965 |
$this->encryptIV = $xor;
|
|
|
966 |
if ($start = strlen($plaintext) % $block_size) {
|
|
|
967 |
$buffer['xor'] = substr($key, $start) . $buffer['xor'];
|
|
|
968 |
}
|
|
|
969 |
}
|
|
|
970 |
break;
|
|
|
971 |
case self::MODE_STREAM:
|
|
|
972 |
$ciphertext = $this->_encryptBlock($plaintext);
|
|
|
973 |
break;
|
|
|
974 |
}
|
|
|
975 |
|
|
|
976 |
return $ciphertext;
|
|
|
977 |
}
|
|
|
978 |
|
|
|
979 |
/**
|
|
|
980 |
* Decrypts a message.
|
|
|
981 |
*
|
|
|
982 |
* If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
|
|
|
983 |
* it is.
|
|
|
984 |
*
|
|
|
985 |
* @see self::encrypt()
|
|
|
986 |
* @access public
|
|
|
987 |
* @param string $ciphertext
|
|
|
988 |
* @return string $plaintext
|
|
|
989 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
990 |
*/
|
|
|
991 |
function decrypt($ciphertext)
|
|
|
992 |
{
|
|
|
993 |
if ($this->paddable) {
|
|
|
994 |
// we pad with chr(0) since that's what mcrypt_generic does. to quote from {@link http://www.php.net/function.mcrypt-generic}:
|
|
|
995 |
// "The data is padded with "\0" to make sure the length of the data is n * blocksize."
|
|
|
996 |
$ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($this->block_size - strlen($ciphertext) % $this->block_size) % $this->block_size, chr(0));
|
|
|
997 |
}
|
|
|
998 |
|
|
|
999 |
if ($this->engine === self::ENGINE_OPENSSL) {
|
|
|
1000 |
if ($this->changed) {
|
|
|
1001 |
$this->_clearBuffers();
|
|
|
1002 |
$this->changed = false;
|
|
|
1003 |
}
|
|
|
1004 |
switch ($this->mode) {
|
|
|
1005 |
case self::MODE_STREAM:
|
|
|
1006 |
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
|
|
|
1007 |
break;
|
|
|
1008 |
case self::MODE_ECB:
|
|
|
1009 |
if (!defined('OPENSSL_RAW_DATA')) {
|
|
|
1010 |
$ciphertext.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $this->key, true);
|
|
|
1011 |
}
|
|
|
1012 |
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
|
|
|
1013 |
break;
|
|
|
1014 |
case self::MODE_CBC:
|
|
|
1015 |
if (!defined('OPENSSL_RAW_DATA')) {
|
|
|
1016 |
$padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
|
|
|
1017 |
$ciphertext.= substr(openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size);
|
|
|
1018 |
$offset = 2 * $this->block_size;
|
|
|
1019 |
} else {
|
|
|
1020 |
$offset = $this->block_size;
|
|
|
1021 |
}
|
|
|
1022 |
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
|
|
|
1023 |
if ($this->continuousBuffer) {
|
|
|
1024 |
$this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
|
|
|
1025 |
}
|
|
|
1026 |
break;
|
|
|
1027 |
case self::MODE_CTR:
|
|
|
1028 |
$plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
|
|
|
1029 |
break;
|
|
|
1030 |
case self::MODE_CFB:
|
|
|
1031 |
// cfb loosely routines inspired by openssl's:
|
|
|
1032 |
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
|
|
|
1033 |
$plaintext = '';
|
|
|
1034 |
if ($this->continuousBuffer) {
|
|
|
1035 |
$iv = &$this->decryptIV;
|
|
|
1036 |
$pos = &$this->buffer['pos'];
|
|
|
1037 |
} else {
|
|
|
1038 |
$iv = $this->decryptIV;
|
|
|
1039 |
$pos = 0;
|
|
|
1040 |
}
|
|
|
1041 |
$len = strlen($ciphertext);
|
|
|
1042 |
$i = 0;
|
|
|
1043 |
if ($pos) {
|
|
|
1044 |
$orig_pos = $pos;
|
|
|
1045 |
$max = $this->block_size - $pos;
|
|
|
1046 |
if ($len >= $max) {
|
|
|
1047 |
$i = $max;
|
|
|
1048 |
$len-= $max;
|
|
|
1049 |
$pos = 0;
|
|
|
1050 |
} else {
|
|
|
1051 |
$i = $len;
|
|
|
1052 |
$pos+= $len;
|
|
|
1053 |
$len = 0;
|
|
|
1054 |
}
|
|
|
1055 |
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $this->blocksize
|
|
|
1056 |
$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
|
|
|
1057 |
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
|
|
|
1058 |
$ciphertext = substr($ciphertext, $i);
|
|
|
1059 |
}
|
|
|
1060 |
$overflow = $len % $this->block_size;
|
|
|
1061 |
if ($overflow) {
|
|
|
1062 |
$plaintext.= openssl_decrypt(substr($ciphertext, 0, -$overflow), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
|
|
|
1063 |
if ($len - $overflow) {
|
|
|
1064 |
$iv = substr($ciphertext, -$overflow - $this->block_size, -$overflow);
|
|
|
1065 |
}
|
|
|
1066 |
$iv = openssl_encrypt(str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
|
|
|
1067 |
$plaintext.= $iv ^ substr($ciphertext, -$overflow);
|
|
|
1068 |
$iv = substr_replace($iv, substr($ciphertext, -$overflow), 0, $overflow);
|
|
|
1069 |
$pos = $overflow;
|
|
|
1070 |
} elseif ($len) {
|
|
|
1071 |
$plaintext.= openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
|
|
|
1072 |
$iv = substr($ciphertext, -$this->block_size);
|
|
|
1073 |
}
|
|
|
1074 |
break;
|
|
|
1075 |
case self::MODE_OFB:
|
|
|
1076 |
$plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
|
|
|
1077 |
}
|
|
|
1078 |
|
|
|
1079 |
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
|
|
|
1080 |
}
|
|
|
1081 |
|
|
|
1082 |
if ($this->engine === self::ENGINE_MCRYPT) {
|
|
|
1083 |
$block_size = $this->block_size;
|
|
|
1084 |
if ($this->changed) {
|
|
|
1085 |
$this->_setupMcrypt();
|
|
|
1086 |
$this->changed = false;
|
|
|
1087 |
}
|
|
|
1088 |
if ($this->dechanged) {
|
|
|
1089 |
@mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
|
|
1090 |
$this->dechanged = false;
|
|
|
1091 |
}
|
|
|
1092 |
|
|
|
1093 |
if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
|
|
|
1094 |
$iv = &$this->decryptIV;
|
|
|
1095 |
$pos = &$this->debuffer['pos'];
|
|
|
1096 |
$len = strlen($ciphertext);
|
|
|
1097 |
$plaintext = '';
|
|
|
1098 |
$i = 0;
|
|
|
1099 |
if ($pos) {
|
|
|
1100 |
$orig_pos = $pos;
|
|
|
1101 |
$max = $block_size - $pos;
|
|
|
1102 |
if ($len >= $max) {
|
|
|
1103 |
$i = $max;
|
|
|
1104 |
$len-= $max;
|
|
|
1105 |
$pos = 0;
|
|
|
1106 |
} else {
|
|
|
1107 |
$i = $len;
|
|
|
1108 |
$pos+= $len;
|
|
|
1109 |
$len = 0;
|
|
|
1110 |
}
|
|
|
1111 |
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
|
1112 |
$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
|
|
|
1113 |
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
|
|
|
1114 |
}
|
|
|
1115 |
if ($len >= $block_size) {
|
|
|
1116 |
$cb = substr($ciphertext, $i, $len - $len % $block_size);
|
|
|
1117 |
$plaintext.= @mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
|
|
|
1118 |
$iv = substr($cb, -$block_size);
|
|
|
1119 |
$len%= $block_size;
|
|
|
1120 |
}
|
|
|
1121 |
if ($len) {
|
|
|
1122 |
$iv = @mcrypt_generic($this->ecb, $iv);
|
|
|
1123 |
$plaintext.= $iv ^ substr($ciphertext, -$len);
|
|
|
1124 |
$iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
|
|
|
1125 |
$pos = $len;
|
|
|
1126 |
}
|
|
|
1127 |
|
|
|
1128 |
return $plaintext;
|
|
|
1129 |
}
|
|
|
1130 |
|
|
|
1131 |
$plaintext = @mdecrypt_generic($this->demcrypt, $ciphertext);
|
|
|
1132 |
|
|
|
1133 |
if (!$this->continuousBuffer) {
|
|
|
1134 |
@mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
|
|
1135 |
}
|
|
|
1136 |
|
|
|
1137 |
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
|
|
|
1138 |
}
|
|
|
1139 |
|
|
|
1140 |
if ($this->changed) {
|
|
|
1141 |
$this->_setup();
|
|
|
1142 |
$this->changed = false;
|
|
|
1143 |
}
|
|
|
1144 |
if ($this->use_inline_crypt) {
|
|
|
1145 |
$inline = $this->inline_crypt;
|
|
|
1146 |
return $inline('decrypt', $this, $ciphertext);
|
|
|
1147 |
}
|
|
|
1148 |
|
|
|
1149 |
$block_size = $this->block_size;
|
|
|
1150 |
|
|
|
1151 |
$buffer = &$this->debuffer;
|
|
|
1152 |
$plaintext = '';
|
|
|
1153 |
switch ($this->mode) {
|
|
|
1154 |
case self::MODE_ECB:
|
|
|
1155 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1156 |
$plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
|
|
|
1157 |
}
|
|
|
1158 |
break;
|
|
|
1159 |
case self::MODE_CBC:
|
|
|
1160 |
$xor = $this->decryptIV;
|
|
|
1161 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1162 |
$block = substr($ciphertext, $i, $block_size);
|
|
|
1163 |
$plaintext.= $this->_decryptBlock($block) ^ $xor;
|
|
|
1164 |
$xor = $block;
|
|
|
1165 |
}
|
|
|
1166 |
if ($this->continuousBuffer) {
|
|
|
1167 |
$this->decryptIV = $xor;
|
|
|
1168 |
}
|
|
|
1169 |
break;
|
|
|
1170 |
case self::MODE_CTR:
|
|
|
1171 |
$xor = $this->decryptIV;
|
|
|
1172 |
if (strlen($buffer['ciphertext'])) {
|
|
|
1173 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1174 |
$block = substr($ciphertext, $i, $block_size);
|
|
|
1175 |
if (strlen($block) > strlen($buffer['ciphertext'])) {
|
|
|
1176 |
$buffer['ciphertext'].= $this->_encryptBlock($xor);
|
|
|
1177 |
$this->_increment_str($xor);
|
|
|
1178 |
}
|
|
|
1179 |
$key = $this->_string_shift($buffer['ciphertext'], $block_size);
|
|
|
1180 |
$plaintext.= $block ^ $key;
|
|
|
1181 |
}
|
|
|
1182 |
} else {
|
|
|
1183 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1184 |
$block = substr($ciphertext, $i, $block_size);
|
|
|
1185 |
$key = $this->_encryptBlock($xor);
|
|
|
1186 |
$this->_increment_str($xor);
|
|
|
1187 |
$plaintext.= $block ^ $key;
|
|
|
1188 |
}
|
|
|
1189 |
}
|
|
|
1190 |
if ($this->continuousBuffer) {
|
|
|
1191 |
$this->decryptIV = $xor;
|
|
|
1192 |
if ($start = strlen($ciphertext) % $block_size) {
|
|
|
1193 |
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
|
|
|
1194 |
}
|
|
|
1195 |
}
|
|
|
1196 |
break;
|
|
|
1197 |
case self::MODE_CFB:
|
|
|
1198 |
if ($this->continuousBuffer) {
|
|
|
1199 |
$iv = &$this->decryptIV;
|
|
|
1200 |
$pos = &$buffer['pos'];
|
|
|
1201 |
} else {
|
|
|
1202 |
$iv = $this->decryptIV;
|
|
|
1203 |
$pos = 0;
|
|
|
1204 |
}
|
|
|
1205 |
$len = strlen($ciphertext);
|
|
|
1206 |
$i = 0;
|
|
|
1207 |
if ($pos) {
|
|
|
1208 |
$orig_pos = $pos;
|
|
|
1209 |
$max = $block_size - $pos;
|
|
|
1210 |
if ($len >= $max) {
|
|
|
1211 |
$i = $max;
|
|
|
1212 |
$len-= $max;
|
|
|
1213 |
$pos = 0;
|
|
|
1214 |
} else {
|
|
|
1215 |
$i = $len;
|
|
|
1216 |
$pos+= $len;
|
|
|
1217 |
$len = 0;
|
|
|
1218 |
}
|
|
|
1219 |
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
|
1220 |
$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
|
|
|
1221 |
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
|
|
|
1222 |
}
|
|
|
1223 |
while ($len >= $block_size) {
|
|
|
1224 |
$iv = $this->_encryptBlock($iv);
|
|
|
1225 |
$cb = substr($ciphertext, $i, $block_size);
|
|
|
1226 |
$plaintext.= $iv ^ $cb;
|
|
|
1227 |
$iv = $cb;
|
|
|
1228 |
$len-= $block_size;
|
|
|
1229 |
$i+= $block_size;
|
|
|
1230 |
}
|
|
|
1231 |
if ($len) {
|
|
|
1232 |
$iv = $this->_encryptBlock($iv);
|
|
|
1233 |
$plaintext.= $iv ^ substr($ciphertext, $i);
|
|
|
1234 |
$iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
|
|
|
1235 |
$pos = $len;
|
|
|
1236 |
}
|
|
|
1237 |
break;
|
|
|
1238 |
case self::MODE_OFB:
|
|
|
1239 |
$xor = $this->decryptIV;
|
|
|
1240 |
if (strlen($buffer['xor'])) {
|
|
|
1241 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1242 |
$block = substr($ciphertext, $i, $block_size);
|
|
|
1243 |
if (strlen($block) > strlen($buffer['xor'])) {
|
|
|
1244 |
$xor = $this->_encryptBlock($xor);
|
|
|
1245 |
$buffer['xor'].= $xor;
|
|
|
1246 |
}
|
|
|
1247 |
$key = $this->_string_shift($buffer['xor'], $block_size);
|
|
|
1248 |
$plaintext.= $block ^ $key;
|
|
|
1249 |
}
|
|
|
1250 |
} else {
|
|
|
1251 |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
|
1252 |
$xor = $this->_encryptBlock($xor);
|
|
|
1253 |
$plaintext.= substr($ciphertext, $i, $block_size) ^ $xor;
|
|
|
1254 |
}
|
|
|
1255 |
$key = $xor;
|
|
|
1256 |
}
|
|
|
1257 |
if ($this->continuousBuffer) {
|
|
|
1258 |
$this->decryptIV = $xor;
|
|
|
1259 |
if ($start = strlen($ciphertext) % $block_size) {
|
|
|
1260 |
$buffer['xor'] = substr($key, $start) . $buffer['xor'];
|
|
|
1261 |
}
|
|
|
1262 |
}
|
|
|
1263 |
break;
|
|
|
1264 |
case self::MODE_STREAM:
|
|
|
1265 |
$plaintext = $this->_decryptBlock($ciphertext);
|
|
|
1266 |
break;
|
|
|
1267 |
}
|
|
|
1268 |
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
|
|
|
1269 |
}
|
|
|
1270 |
|
|
|
1271 |
/**
|
|
|
1272 |
* OpenSSL CTR Processor
|
|
|
1273 |
*
|
|
|
1274 |
* PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
|
|
|
1275 |
* for CTR is the same for both encrypting and decrypting this function is re-used by both Base::encrypt()
|
|
|
1276 |
* and Base::decrypt(). Also, OpenSSL doesn't implement CTR for all of it's symmetric ciphers so this
|
|
|
1277 |
* function will emulate CTR with ECB when necessary.
|
|
|
1278 |
*
|
|
|
1279 |
* @see self::encrypt()
|
|
|
1280 |
* @see self::decrypt()
|
|
|
1281 |
* @param string $plaintext
|
|
|
1282 |
* @param string $encryptIV
|
|
|
1283 |
* @param array $buffer
|
|
|
1284 |
* @return string
|
|
|
1285 |
* @access private
|
|
|
1286 |
*/
|
|
|
1287 |
function _openssl_ctr_process($plaintext, &$encryptIV, &$buffer)
|
|
|
1288 |
{
|
|
|
1289 |
$ciphertext = '';
|
|
|
1290 |
|
|
|
1291 |
$block_size = $this->block_size;
|
|
|
1292 |
$key = $this->key;
|
|
|
1293 |
|
|
|
1294 |
if ($this->openssl_emulate_ctr) {
|
|
|
1295 |
$xor = $encryptIV;
|
|
|
1296 |
if (strlen($buffer['ciphertext'])) {
|
|
|
1297 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
1298 |
$block = substr($plaintext, $i, $block_size);
|
|
|
1299 |
if (strlen($block) > strlen($buffer['ciphertext'])) {
|
|
|
1300 |
$result = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
|
|
|
1301 |
$result = !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
|
|
|
1302 |
$buffer['ciphertext'].= $result;
|
|
|
1303 |
}
|
|
|
1304 |
$this->_increment_str($xor);
|
|
|
1305 |
$otp = $this->_string_shift($buffer['ciphertext'], $block_size);
|
|
|
1306 |
$ciphertext.= $block ^ $otp;
|
|
|
1307 |
}
|
|
|
1308 |
} else {
|
|
|
1309 |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
|
1310 |
$block = substr($plaintext, $i, $block_size);
|
|
|
1311 |
$otp = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
|
|
|
1312 |
$otp = !defined('OPENSSL_RAW_DATA') ? substr($otp, 0, -$this->block_size) : $otp;
|
|
|
1313 |
$this->_increment_str($xor);
|
|
|
1314 |
$ciphertext.= $block ^ $otp;
|
|
|
1315 |
}
|
|
|
1316 |
}
|
|
|
1317 |
if ($this->continuousBuffer) {
|
|
|
1318 |
$encryptIV = $xor;
|
|
|
1319 |
if ($start = strlen($plaintext) % $block_size) {
|
|
|
1320 |
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
|
|
|
1321 |
}
|
|
|
1322 |
}
|
|
|
1323 |
|
|
|
1324 |
return $ciphertext;
|
|
|
1325 |
}
|
|
|
1326 |
|
|
|
1327 |
if (strlen($buffer['ciphertext'])) {
|
|
|
1328 |
$ciphertext = $plaintext ^ $this->_string_shift($buffer['ciphertext'], strlen($plaintext));
|
|
|
1329 |
$plaintext = substr($plaintext, strlen($ciphertext));
|
|
|
1330 |
|
|
|
1331 |
if (!strlen($plaintext)) {
|
|
|
1332 |
return $ciphertext;
|
|
|
1333 |
}
|
|
|
1334 |
}
|
|
|
1335 |
|
|
|
1336 |
$overflow = strlen($plaintext) % $block_size;
|
|
|
1337 |
if ($overflow) {
|
|
|
1338 |
$plaintext2 = $this->_string_pop($plaintext, $overflow); // ie. trim $plaintext to a multiple of $block_size and put rest of $plaintext in $plaintext2
|
|
|
1339 |
$encrypted = openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
|
|
|
1340 |
$temp = $this->_string_pop($encrypted, $block_size);
|
|
|
1341 |
$ciphertext.= $encrypted . ($plaintext2 ^ $temp);
|
|
|
1342 |
if ($this->continuousBuffer) {
|
|
|
1343 |
$buffer['ciphertext'] = substr($temp, $overflow);
|
|
|
1344 |
$encryptIV = $temp;
|
|
|
1345 |
}
|
|
|
1346 |
} elseif (!strlen($buffer['ciphertext'])) {
|
|
|
1347 |
$ciphertext.= openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
|
|
|
1348 |
$temp = $this->_string_pop($ciphertext, $block_size);
|
|
|
1349 |
if ($this->continuousBuffer) {
|
|
|
1350 |
$encryptIV = $temp;
|
|
|
1351 |
}
|
|
|
1352 |
}
|
|
|
1353 |
if ($this->continuousBuffer) {
|
|
|
1354 |
if (!defined('OPENSSL_RAW_DATA')) {
|
|
|
1355 |
$encryptIV.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
|
|
|
1356 |
}
|
|
|
1357 |
$encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
|
|
|
1358 |
if ($overflow) {
|
|
|
1359 |
$this->_increment_str($encryptIV);
|
|
|
1360 |
}
|
|
|
1361 |
}
|
|
|
1362 |
|
|
|
1363 |
return $ciphertext;
|
|
|
1364 |
}
|
|
|
1365 |
|
|
|
1366 |
/**
|
|
|
1367 |
* OpenSSL OFB Processor
|
|
|
1368 |
*
|
|
|
1369 |
* PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
|
|
|
1370 |
* for OFB is the same for both encrypting and decrypting this function is re-used by both Base::encrypt()
|
|
|
1371 |
* and Base::decrypt().
|
|
|
1372 |
*
|
|
|
1373 |
* @see self::encrypt()
|
|
|
1374 |
* @see self::decrypt()
|
|
|
1375 |
* @param string $plaintext
|
|
|
1376 |
* @param string $encryptIV
|
|
|
1377 |
* @param array $buffer
|
|
|
1378 |
* @return string
|
|
|
1379 |
* @access private
|
|
|
1380 |
*/
|
|
|
1381 |
function _openssl_ofb_process($plaintext, &$encryptIV, &$buffer)
|
|
|
1382 |
{
|
|
|
1383 |
if (strlen($buffer['xor'])) {
|
|
|
1384 |
$ciphertext = $plaintext ^ $buffer['xor'];
|
|
|
1385 |
$buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
|
|
|
1386 |
$plaintext = substr($plaintext, strlen($ciphertext));
|
|
|
1387 |
} else {
|
|
|
1388 |
$ciphertext = '';
|
|
|
1389 |
}
|
|
|
1390 |
|
|
|
1391 |
$block_size = $this->block_size;
|
|
|
1392 |
|
|
|
1393 |
$len = strlen($plaintext);
|
|
|
1394 |
$key = $this->key;
|
|
|
1395 |
$overflow = $len % $block_size;
|
|
|
1396 |
|
|
|
1397 |
if (strlen($plaintext)) {
|
|
|
1398 |
if ($overflow) {
|
|
|
1399 |
$ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
|
|
|
1400 |
$xor = $this->_string_pop($ciphertext, $block_size);
|
|
|
1401 |
if ($this->continuousBuffer) {
|
|
|
1402 |
$encryptIV = $xor;
|
|
|
1403 |
}
|
|
|
1404 |
$ciphertext.= $this->_string_shift($xor, $overflow) ^ substr($plaintext, -$overflow);
|
|
|
1405 |
if ($this->continuousBuffer) {
|
|
|
1406 |
$buffer['xor'] = $xor;
|
|
|
1407 |
}
|
|
|
1408 |
} else {
|
|
|
1409 |
$ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
|
|
|
1410 |
if ($this->continuousBuffer) {
|
|
|
1411 |
$encryptIV = substr($ciphertext, -$block_size) ^ substr($plaintext, -$block_size);
|
|
|
1412 |
}
|
|
|
1413 |
}
|
|
|
1414 |
}
|
|
|
1415 |
|
|
|
1416 |
return $ciphertext;
|
|
|
1417 |
}
|
|
|
1418 |
|
|
|
1419 |
/**
|
|
|
1420 |
* phpseclib <-> OpenSSL Mode Mapper
|
|
|
1421 |
*
|
|
|
1422 |
* May need to be overwritten by classes extending this one in some cases
|
|
|
1423 |
*
|
|
|
1424 |
* @return int
|
|
|
1425 |
* @access private
|
|
|
1426 |
*/
|
|
|
1427 |
function _openssl_translate_mode()
|
|
|
1428 |
{
|
|
|
1429 |
switch ($this->mode) {
|
|
|
1430 |
case self::MODE_ECB:
|
|
|
1431 |
return 'ecb';
|
|
|
1432 |
case self::MODE_CBC:
|
|
|
1433 |
return 'cbc';
|
|
|
1434 |
case self::MODE_CTR:
|
|
|
1435 |
return 'ctr';
|
|
|
1436 |
case self::MODE_CFB:
|
|
|
1437 |
return 'cfb';
|
|
|
1438 |
case self::MODE_OFB:
|
|
|
1439 |
return 'ofb';
|
|
|
1440 |
}
|
|
|
1441 |
}
|
|
|
1442 |
|
|
|
1443 |
/**
|
|
|
1444 |
* Pad "packets".
|
|
|
1445 |
*
|
|
|
1446 |
* Block ciphers working by encrypting between their specified [$this->]block_size at a time
|
|
|
1447 |
* If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
|
|
|
1448 |
* pad the input so that it is of the proper length.
|
|
|
1449 |
*
|
|
|
1450 |
* Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH,
|
|
|
1451 |
* where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping
|
|
|
1452 |
* away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
|
|
|
1453 |
* transmitted separately)
|
|
|
1454 |
*
|
|
|
1455 |
* @see self::disablePadding()
|
|
|
1456 |
* @access public
|
|
|
1457 |
*/
|
|
|
1458 |
function enablePadding()
|
|
|
1459 |
{
|
|
|
1460 |
$this->padding = true;
|
|
|
1461 |
}
|
|
|
1462 |
|
|
|
1463 |
/**
|
|
|
1464 |
* Do not pad packets.
|
|
|
1465 |
*
|
|
|
1466 |
* @see self::enablePadding()
|
|
|
1467 |
* @access public
|
|
|
1468 |
*/
|
|
|
1469 |
function disablePadding()
|
|
|
1470 |
{
|
|
|
1471 |
$this->padding = false;
|
|
|
1472 |
}
|
|
|
1473 |
|
|
|
1474 |
/**
|
|
|
1475 |
* Treat consecutive "packets" as if they are a continuous buffer.
|
|
|
1476 |
*
|
|
|
1477 |
* Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets
|
|
|
1478 |
* will yield different outputs:
|
|
|
1479 |
*
|
|
|
1480 |
* <code>
|
|
|
1481 |
* echo $rijndael->encrypt(substr($plaintext, 0, 16));
|
|
|
1482 |
* echo $rijndael->encrypt(substr($plaintext, 16, 16));
|
|
|
1483 |
* </code>
|
|
|
1484 |
* <code>
|
|
|
1485 |
* echo $rijndael->encrypt($plaintext);
|
|
|
1486 |
* </code>
|
|
|
1487 |
*
|
|
|
1488 |
* The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates
|
|
|
1489 |
* another, as demonstrated with the following:
|
|
|
1490 |
*
|
|
|
1491 |
* <code>
|
|
|
1492 |
* $rijndael->encrypt(substr($plaintext, 0, 16));
|
|
|
1493 |
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
|
|
|
1494 |
* </code>
|
|
|
1495 |
* <code>
|
|
|
1496 |
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
|
|
|
1497 |
* </code>
|
|
|
1498 |
*
|
|
|
1499 |
* With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different
|
|
|
1500 |
* outputs. The reason is due to the fact that the initialization vector's change after every encryption /
|
|
|
1501 |
* decryption round when the continuous buffer is enabled. When it's disabled, they remain constant.
|
|
|
1502 |
*
|
|
|
1503 |
* Put another way, when the continuous buffer is enabled, the state of the \phpseclib\Crypt\*() object changes after each
|
|
|
1504 |
* encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that
|
|
|
1505 |
* continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them),
|
|
|
1506 |
* however, they are also less intuitive and more likely to cause you problems.
|
|
|
1507 |
*
|
|
|
1508 |
* @see self::disableContinuousBuffer()
|
|
|
1509 |
* @access public
|
|
|
1510 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
1511 |
*/
|
|
|
1512 |
function enableContinuousBuffer()
|
|
|
1513 |
{
|
|
|
1514 |
if ($this->mode == self::MODE_ECB) {
|
|
|
1515 |
return;
|
|
|
1516 |
}
|
|
|
1517 |
|
|
|
1518 |
$this->continuousBuffer = true;
|
|
|
1519 |
|
|
|
1520 |
$this->_setEngine();
|
|
|
1521 |
}
|
|
|
1522 |
|
|
|
1523 |
/**
|
|
|
1524 |
* Treat consecutive packets as if they are a discontinuous buffer.
|
|
|
1525 |
*
|
|
|
1526 |
* The default behavior.
|
|
|
1527 |
*
|
|
|
1528 |
* @see self::enableContinuousBuffer()
|
|
|
1529 |
* @access public
|
|
|
1530 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
1531 |
*/
|
|
|
1532 |
function disableContinuousBuffer()
|
|
|
1533 |
{
|
|
|
1534 |
if ($this->mode == self::MODE_ECB) {
|
|
|
1535 |
return;
|
|
|
1536 |
}
|
|
|
1537 |
if (!$this->continuousBuffer) {
|
|
|
1538 |
return;
|
|
|
1539 |
}
|
|
|
1540 |
|
|
|
1541 |
$this->continuousBuffer = false;
|
|
|
1542 |
$this->changed = true;
|
|
|
1543 |
|
|
|
1544 |
$this->_setEngine();
|
|
|
1545 |
}
|
|
|
1546 |
|
|
|
1547 |
/**
|
|
|
1548 |
* Test for engine validity
|
|
|
1549 |
*
|
|
|
1550 |
* @see self::__construct()
|
|
|
1551 |
* @param int $engine
|
|
|
1552 |
* @access public
|
|
|
1553 |
* @return bool
|
|
|
1554 |
*/
|
|
|
1555 |
function isValidEngine($engine)
|
|
|
1556 |
{
|
|
|
1557 |
switch ($engine) {
|
|
|
1558 |
case self::ENGINE_OPENSSL:
|
|
|
1559 |
if ($this->mode == self::MODE_STREAM && $this->continuousBuffer) {
|
|
|
1560 |
return false;
|
|
|
1561 |
}
|
|
|
1562 |
$this->openssl_emulate_ctr = false;
|
|
|
1563 |
$result = $this->cipher_name_openssl &&
|
|
|
1564 |
extension_loaded('openssl') &&
|
|
|
1565 |
// PHP 5.3.0 - 5.3.2 did not let you set IV's
|
|
|
1566 |
version_compare(PHP_VERSION, '5.3.3', '>=');
|
|
|
1567 |
if (!$result) {
|
|
|
1568 |
return false;
|
|
|
1569 |
}
|
|
|
1570 |
|
|
|
1571 |
// prior to PHP 5.4.0 OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING were not defined. instead of expecting an integer
|
|
|
1572 |
// $options openssl_encrypt expected a boolean $raw_data.
|
|
|
1573 |
if (!defined('OPENSSL_RAW_DATA')) {
|
|
|
1574 |
$this->openssl_options = true;
|
|
|
1575 |
} else {
|
|
|
1576 |
$this->openssl_options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
|
|
|
1577 |
}
|
|
|
1578 |
|
|
|
1579 |
$methods = openssl_get_cipher_methods();
|
|
|
1580 |
if (in_array($this->cipher_name_openssl, $methods)) {
|
|
|
1581 |
return true;
|
|
|
1582 |
}
|
|
|
1583 |
// not all of openssl's symmetric cipher's support ctr. for those
|
|
|
1584 |
// that don't we'll emulate it
|
|
|
1585 |
switch ($this->mode) {
|
|
|
1586 |
case self::MODE_CTR:
|
|
|
1587 |
if (in_array($this->cipher_name_openssl_ecb, $methods)) {
|
|
|
1588 |
$this->openssl_emulate_ctr = true;
|
|
|
1589 |
return true;
|
|
|
1590 |
}
|
|
|
1591 |
}
|
|
|
1592 |
return false;
|
|
|
1593 |
case self::ENGINE_MCRYPT:
|
|
|
1594 |
return $this->cipher_name_mcrypt &&
|
|
|
1595 |
extension_loaded('mcrypt') &&
|
|
|
1596 |
in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms());
|
|
|
1597 |
case self::ENGINE_INTERNAL:
|
|
|
1598 |
return true;
|
|
|
1599 |
}
|
|
|
1600 |
|
|
|
1601 |
return false;
|
|
|
1602 |
}
|
|
|
1603 |
|
|
|
1604 |
/**
|
|
|
1605 |
* Sets the preferred crypt engine
|
|
|
1606 |
*
|
|
|
1607 |
* Currently, $engine could be:
|
|
|
1608 |
*
|
|
|
1609 |
* - \phpseclib\Crypt\Base::ENGINE_OPENSSL [very fast]
|
|
|
1610 |
*
|
|
|
1611 |
* - \phpseclib\Crypt\Base::ENGINE_MCRYPT [fast]
|
|
|
1612 |
*
|
|
|
1613 |
* - \phpseclib\Crypt\Base::ENGINE_INTERNAL [slow]
|
|
|
1614 |
*
|
|
|
1615 |
* If the preferred crypt engine is not available the fastest available one will be used
|
|
|
1616 |
*
|
|
|
1617 |
* @see self::__construct()
|
|
|
1618 |
* @param int $engine
|
|
|
1619 |
* @access public
|
|
|
1620 |
*/
|
|
|
1621 |
function setPreferredEngine($engine)
|
|
|
1622 |
{
|
|
|
1623 |
switch ($engine) {
|
|
|
1624 |
//case self::ENGINE_OPENSSL;
|
|
|
1625 |
case self::ENGINE_MCRYPT:
|
|
|
1626 |
case self::ENGINE_INTERNAL:
|
|
|
1627 |
$this->preferredEngine = $engine;
|
|
|
1628 |
break;
|
|
|
1629 |
default:
|
|
|
1630 |
$this->preferredEngine = self::ENGINE_OPENSSL;
|
|
|
1631 |
}
|
|
|
1632 |
|
|
|
1633 |
$this->_setEngine();
|
|
|
1634 |
}
|
|
|
1635 |
|
|
|
1636 |
/**
|
|
|
1637 |
* Returns the engine currently being utilized
|
|
|
1638 |
*
|
|
|
1639 |
* @see self::_setEngine()
|
|
|
1640 |
* @access public
|
|
|
1641 |
*/
|
|
|
1642 |
function getEngine()
|
|
|
1643 |
{
|
|
|
1644 |
return $this->engine;
|
|
|
1645 |
}
|
|
|
1646 |
|
|
|
1647 |
/**
|
|
|
1648 |
* Sets the engine as appropriate
|
|
|
1649 |
*
|
|
|
1650 |
* @see self::__construct()
|
|
|
1651 |
* @access private
|
|
|
1652 |
*/
|
|
|
1653 |
function _setEngine()
|
|
|
1654 |
{
|
|
|
1655 |
$this->engine = null;
|
|
|
1656 |
|
|
|
1657 |
$candidateEngines = array(
|
|
|
1658 |
$this->preferredEngine,
|
|
|
1659 |
self::ENGINE_OPENSSL,
|
|
|
1660 |
self::ENGINE_MCRYPT
|
|
|
1661 |
);
|
|
|
1662 |
foreach ($candidateEngines as $engine) {
|
|
|
1663 |
if ($this->isValidEngine($engine)) {
|
|
|
1664 |
$this->engine = $engine;
|
|
|
1665 |
break;
|
|
|
1666 |
}
|
|
|
1667 |
}
|
|
|
1668 |
if (!$this->engine) {
|
|
|
1669 |
$this->engine = self::ENGINE_INTERNAL;
|
|
|
1670 |
}
|
|
|
1671 |
|
|
|
1672 |
if ($this->engine != self::ENGINE_MCRYPT && $this->enmcrypt) {
|
|
|
1673 |
// Closing the current mcrypt resource(s). _mcryptSetup() will, if needed,
|
|
|
1674 |
// (re)open them with the module named in $this->cipher_name_mcrypt
|
|
|
1675 |
@mcrypt_module_close($this->enmcrypt);
|
|
|
1676 |
@mcrypt_module_close($this->demcrypt);
|
|
|
1677 |
$this->enmcrypt = null;
|
|
|
1678 |
$this->demcrypt = null;
|
|
|
1679 |
|
|
|
1680 |
if ($this->ecb) {
|
|
|
1681 |
@mcrypt_module_close($this->ecb);
|
|
|
1682 |
$this->ecb = null;
|
|
|
1683 |
}
|
|
|
1684 |
}
|
|
|
1685 |
|
|
|
1686 |
$this->changed = true;
|
|
|
1687 |
}
|
|
|
1688 |
|
|
|
1689 |
/**
|
|
|
1690 |
* Encrypts a block
|
|
|
1691 |
*
|
|
|
1692 |
* Note: Must be extended by the child \phpseclib\Crypt\* class
|
|
|
1693 |
*
|
|
|
1694 |
* @access private
|
|
|
1695 |
* @param string $in
|
|
|
1696 |
* @return string
|
|
|
1697 |
*/
|
|
|
1698 |
abstract function _encryptBlock($in);
|
|
|
1699 |
|
|
|
1700 |
/**
|
|
|
1701 |
* Decrypts a block
|
|
|
1702 |
*
|
|
|
1703 |
* Note: Must be extended by the child \phpseclib\Crypt\* class
|
|
|
1704 |
*
|
|
|
1705 |
* @access private
|
|
|
1706 |
* @param string $in
|
|
|
1707 |
* @return string
|
|
|
1708 |
*/
|
|
|
1709 |
abstract function _decryptBlock($in);
|
|
|
1710 |
|
|
|
1711 |
/**
|
|
|
1712 |
* Setup the key (expansion)
|
|
|
1713 |
*
|
|
|
1714 |
* Only used if $engine == self::ENGINE_INTERNAL
|
|
|
1715 |
*
|
|
|
1716 |
* Note: Must extend by the child \phpseclib\Crypt\* class
|
|
|
1717 |
*
|
|
|
1718 |
* @see self::_setup()
|
|
|
1719 |
* @access private
|
|
|
1720 |
*/
|
|
|
1721 |
abstract function _setupKey();
|
|
|
1722 |
|
|
|
1723 |
/**
|
|
|
1724 |
* Setup the self::ENGINE_INTERNAL $engine
|
|
|
1725 |
*
|
|
|
1726 |
* (re)init, if necessary, the internal cipher $engine and flush all $buffers
|
|
|
1727 |
* Used (only) if $engine == self::ENGINE_INTERNAL
|
|
|
1728 |
*
|
|
|
1729 |
* _setup() will be called each time if $changed === true
|
|
|
1730 |
* typically this happens when using one or more of following public methods:
|
|
|
1731 |
*
|
|
|
1732 |
* - setKey()
|
|
|
1733 |
*
|
|
|
1734 |
* - setIV()
|
|
|
1735 |
*
|
|
|
1736 |
* - disableContinuousBuffer()
|
|
|
1737 |
*
|
|
|
1738 |
* - First run of encrypt() / decrypt() with no init-settings
|
|
|
1739 |
*
|
|
|
1740 |
* @see self::setKey()
|
|
|
1741 |
* @see self::setIV()
|
|
|
1742 |
* @see self::disableContinuousBuffer()
|
|
|
1743 |
* @access private
|
|
|
1744 |
* @internal _setup() is always called before en/decryption.
|
|
|
1745 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
1746 |
*/
|
|
|
1747 |
function _setup()
|
|
|
1748 |
{
|
|
|
1749 |
$this->_clearBuffers();
|
|
|
1750 |
$this->_setupKey();
|
|
|
1751 |
|
|
|
1752 |
if ($this->use_inline_crypt) {
|
|
|
1753 |
$this->_setupInlineCrypt();
|
|
|
1754 |
}
|
|
|
1755 |
}
|
|
|
1756 |
|
|
|
1757 |
/**
|
|
|
1758 |
* Setup the self::ENGINE_MCRYPT $engine
|
|
|
1759 |
*
|
|
|
1760 |
* (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
|
|
|
1761 |
* Used (only) if $engine = self::ENGINE_MCRYPT
|
|
|
1762 |
*
|
|
|
1763 |
* _setupMcrypt() will be called each time if $changed === true
|
|
|
1764 |
* typically this happens when using one or more of following public methods:
|
|
|
1765 |
*
|
|
|
1766 |
* - setKey()
|
|
|
1767 |
*
|
|
|
1768 |
* - setIV()
|
|
|
1769 |
*
|
|
|
1770 |
* - disableContinuousBuffer()
|
|
|
1771 |
*
|
|
|
1772 |
* - First run of encrypt() / decrypt()
|
|
|
1773 |
*
|
|
|
1774 |
* @see self::setKey()
|
|
|
1775 |
* @see self::setIV()
|
|
|
1776 |
* @see self::disableContinuousBuffer()
|
|
|
1777 |
* @access private
|
|
|
1778 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
1779 |
*/
|
|
|
1780 |
function _setupMcrypt()
|
|
|
1781 |
{
|
|
|
1782 |
$this->_clearBuffers();
|
|
|
1783 |
$this->enchanged = $this->dechanged = true;
|
|
|
1784 |
|
|
|
1785 |
if (!isset($this->enmcrypt)) {
|
|
|
1786 |
static $mcrypt_modes = array(
|
|
|
1787 |
self::MODE_CTR => 'ctr',
|
|
|
1788 |
self::MODE_ECB => MCRYPT_MODE_ECB,
|
|
|
1789 |
self::MODE_CBC => MCRYPT_MODE_CBC,
|
|
|
1790 |
self::MODE_CFB => 'ncfb',
|
|
|
1791 |
self::MODE_OFB => MCRYPT_MODE_NOFB,
|
|
|
1792 |
self::MODE_STREAM => MCRYPT_MODE_STREAM,
|
|
|
1793 |
);
|
|
|
1794 |
|
|
|
1795 |
$this->demcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
|
|
|
1796 |
$this->enmcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
|
|
|
1797 |
|
|
|
1798 |
// we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
|
|
|
1799 |
// to workaround mcrypt's broken ncfb implementation in buffered mode
|
|
|
1800 |
// see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
|
|
|
1801 |
if ($this->mode == self::MODE_CFB) {
|
|
|
1802 |
$this->ecb = @mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
|
|
|
1803 |
}
|
|
|
1804 |
} // else should mcrypt_generic_deinit be called?
|
|
|
1805 |
|
|
|
1806 |
if ($this->mode == self::MODE_CFB) {
|
|
|
1807 |
@mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
|
|
|
1808 |
}
|
|
|
1809 |
}
|
|
|
1810 |
|
|
|
1811 |
/**
|
|
|
1812 |
* Pads a string
|
|
|
1813 |
*
|
|
|
1814 |
* Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
|
|
|
1815 |
* $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to
|
|
|
1816 |
* chr($this->block_size - (strlen($text) % $this->block_size)
|
|
|
1817 |
*
|
|
|
1818 |
* If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
|
|
|
1819 |
* and padding will, hence forth, be enabled.
|
|
|
1820 |
*
|
|
|
1821 |
* @see self::_unpad()
|
|
|
1822 |
* @param string $text
|
|
|
1823 |
* @access private
|
|
|
1824 |
* @return string
|
|
|
1825 |
*/
|
|
|
1826 |
function _pad($text)
|
|
|
1827 |
{
|
|
|
1828 |
$length = strlen($text);
|
|
|
1829 |
|
|
|
1830 |
if (!$this->padding) {
|
|
|
1831 |
if ($length % $this->block_size == 0) {
|
|
|
1832 |
return $text;
|
|
|
1833 |
} else {
|
|
|
1834 |
user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})");
|
|
|
1835 |
$this->padding = true;
|
|
|
1836 |
}
|
|
|
1837 |
}
|
|
|
1838 |
|
|
|
1839 |
$pad = $this->block_size - ($length % $this->block_size);
|
|
|
1840 |
|
|
|
1841 |
return str_pad($text, $length + $pad, chr($pad));
|
|
|
1842 |
}
|
|
|
1843 |
|
|
|
1844 |
/**
|
|
|
1845 |
* Unpads a string.
|
|
|
1846 |
*
|
|
|
1847 |
* If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
|
|
|
1848 |
* and false will be returned.
|
|
|
1849 |
*
|
|
|
1850 |
* @see self::_pad()
|
|
|
1851 |
* @param string $text
|
|
|
1852 |
* @access private
|
|
|
1853 |
* @return string
|
|
|
1854 |
*/
|
|
|
1855 |
function _unpad($text)
|
|
|
1856 |
{
|
|
|
1857 |
if (!$this->padding) {
|
|
|
1858 |
return $text;
|
|
|
1859 |
}
|
|
|
1860 |
|
|
|
1861 |
$length = ord($text[strlen($text) - 1]);
|
|
|
1862 |
|
|
|
1863 |
if (!$length || $length > $this->block_size) {
|
|
|
1864 |
return false;
|
|
|
1865 |
}
|
|
|
1866 |
|
|
|
1867 |
return substr($text, 0, -$length);
|
|
|
1868 |
}
|
|
|
1869 |
|
|
|
1870 |
/**
|
|
|
1871 |
* Clears internal buffers
|
|
|
1872 |
*
|
|
|
1873 |
* Clearing/resetting the internal buffers is done everytime
|
|
|
1874 |
* after disableContinuousBuffer() or on cipher $engine (re)init
|
|
|
1875 |
* ie after setKey() or setIV()
|
|
|
1876 |
*
|
|
|
1877 |
* @access public
|
|
|
1878 |
* @internal Could, but not must, extend by the child Crypt_* class
|
|
|
1879 |
*/
|
|
|
1880 |
function _clearBuffers()
|
|
|
1881 |
{
|
|
|
1882 |
$this->enbuffer = $this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);
|
|
|
1883 |
|
|
|
1884 |
// mcrypt's handling of invalid's $iv:
|
|
|
1885 |
// $this->encryptIV = $this->decryptIV = strlen($this->iv) == $this->block_size ? $this->iv : str_repeat("\0", $this->block_size);
|
|
|
1886 |
$this->encryptIV = $this->decryptIV = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, "\0");
|
|
|
1887 |
|
|
|
1888 |
if (!$this->skip_key_adjustment) {
|
|
|
1889 |
$this->key = str_pad(substr($this->key, 0, $this->key_length), $this->key_length, "\0");
|
|
|
1890 |
}
|
|
|
1891 |
}
|
|
|
1892 |
|
|
|
1893 |
/**
|
|
|
1894 |
* String Shift
|
|
|
1895 |
*
|
|
|
1896 |
* Inspired by array_shift
|
|
|
1897 |
*
|
|
|
1898 |
* @param string $string
|
|
|
1899 |
* @param int $index
|
|
|
1900 |
* @access private
|
|
|
1901 |
* @return string
|
|
|
1902 |
*/
|
|
|
1903 |
function _string_shift(&$string, $index = 1)
|
|
|
1904 |
{
|
|
|
1905 |
$substr = substr($string, 0, $index);
|
|
|
1906 |
$string = substr($string, $index);
|
|
|
1907 |
return $substr;
|
|
|
1908 |
}
|
|
|
1909 |
|
|
|
1910 |
/**
|
|
|
1911 |
* String Pop
|
|
|
1912 |
*
|
|
|
1913 |
* Inspired by array_pop
|
|
|
1914 |
*
|
|
|
1915 |
* @param string $string
|
|
|
1916 |
* @param int $index
|
|
|
1917 |
* @access private
|
|
|
1918 |
* @return string
|
|
|
1919 |
*/
|
|
|
1920 |
function _string_pop(&$string, $index = 1)
|
|
|
1921 |
{
|
|
|
1922 |
$substr = substr($string, -$index);
|
|
|
1923 |
$string = substr($string, 0, -$index);
|
|
|
1924 |
return $substr;
|
|
|
1925 |
}
|
|
|
1926 |
|
|
|
1927 |
/**
|
|
|
1928 |
* Increment the current string
|
|
|
1929 |
*
|
|
|
1930 |
* @see self::decrypt()
|
|
|
1931 |
* @see self::encrypt()
|
|
|
1932 |
* @param string $var
|
|
|
1933 |
* @access private
|
|
|
1934 |
*/
|
|
|
1935 |
function _increment_str(&$var)
|
|
|
1936 |
{
|
|
|
1937 |
for ($i = 4; $i <= strlen($var); $i+= 4) {
|
|
|
1938 |
$temp = substr($var, -$i, 4);
|
|
|
1939 |
switch ($temp) {
|
|
|
1940 |
case "\xFF\xFF\xFF\xFF":
|
|
|
1941 |
$var = substr_replace($var, "\x00\x00\x00\x00", -$i, 4);
|
|
|
1942 |
break;
|
|
|
1943 |
case "\x7F\xFF\xFF\xFF":
|
|
|
1944 |
$var = substr_replace($var, "\x80\x00\x00\x00", -$i, 4);
|
|
|
1945 |
return;
|
|
|
1946 |
default:
|
|
|
1947 |
$temp = unpack('Nnum', $temp);
|
|
|
1948 |
$var = substr_replace($var, pack('N', $temp['num'] + 1), -$i, 4);
|
|
|
1949 |
return;
|
|
|
1950 |
}
|
|
|
1951 |
}
|
|
|
1952 |
|
|
|
1953 |
$remainder = strlen($var) % 4;
|
|
|
1954 |
|
|
|
1955 |
if ($remainder == 0) {
|
|
|
1956 |
return;
|
|
|
1957 |
}
|
|
|
1958 |
|
|
|
1959 |
$temp = unpack('Nnum', str_pad(substr($var, 0, $remainder), 4, "\0", STR_PAD_LEFT));
|
|
|
1960 |
$temp = substr(pack('N', $temp['num'] + 1), -$remainder);
|
|
|
1961 |
$var = substr_replace($var, $temp, 0, $remainder);
|
|
|
1962 |
}
|
|
|
1963 |
|
|
|
1964 |
/**
|
|
|
1965 |
* Setup the performance-optimized function for de/encrypt()
|
|
|
1966 |
*
|
|
|
1967 |
* Stores the created (or existing) callback function-name
|
|
|
1968 |
* in $this->inline_crypt
|
|
|
1969 |
*
|
|
|
1970 |
* Internally for phpseclib developers:
|
|
|
1971 |
*
|
|
|
1972 |
* _setupInlineCrypt() would be called only if:
|
|
|
1973 |
*
|
|
|
1974 |
* - $engine == self::ENGINE_INTERNAL and
|
|
|
1975 |
*
|
|
|
1976 |
* - $use_inline_crypt === true
|
|
|
1977 |
*
|
|
|
1978 |
* - each time on _setup(), after(!) _setupKey()
|
|
|
1979 |
*
|
|
|
1980 |
*
|
|
|
1981 |
* This ensures that _setupInlineCrypt() has always a
|
|
|
1982 |
* full ready2go initializated internal cipher $engine state
|
|
|
1983 |
* where, for example, the keys allready expanded,
|
|
|
1984 |
* keys/block_size calculated and such.
|
|
|
1985 |
*
|
|
|
1986 |
* It is, each time if called, the responsibility of _setupInlineCrypt():
|
|
|
1987 |
*
|
|
|
1988 |
* - to set $this->inline_crypt to a valid and fully working callback function
|
|
|
1989 |
* as a (faster) replacement for encrypt() / decrypt()
|
|
|
1990 |
*
|
|
|
1991 |
* - NOT to create unlimited callback functions (for memory reasons!)
|
|
|
1992 |
* no matter how often _setupInlineCrypt() would be called. At some
|
|
|
1993 |
* point of amount they must be generic re-useable.
|
|
|
1994 |
*
|
|
|
1995 |
* - the code of _setupInlineCrypt() it self,
|
|
|
1996 |
* and the generated callback code,
|
|
|
1997 |
* must be, in following order:
|
|
|
1998 |
* - 100% safe
|
|
|
1999 |
* - 100% compatible to encrypt()/decrypt()
|
|
|
2000 |
* - using only php5+ features/lang-constructs/php-extensions if
|
|
|
2001 |
* compatibility (down to php4) or fallback is provided
|
|
|
2002 |
* - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-)
|
|
|
2003 |
* - >= 10% faster than encrypt()/decrypt() [which is, by the way,
|
|
|
2004 |
* the reason for the existence of _setupInlineCrypt() :-)]
|
|
|
2005 |
* - memory-nice
|
|
|
2006 |
* - short (as good as possible)
|
|
|
2007 |
*
|
|
|
2008 |
* Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
|
|
|
2009 |
* - In case of using inline crypting, _setupInlineCrypt() must extend by the child \phpseclib\Crypt\* class.
|
|
|
2010 |
* - The following variable names are reserved:
|
|
|
2011 |
* - $_* (all variable names prefixed with an underscore)
|
|
|
2012 |
* - $self (object reference to it self. Do not use $this, but $self instead)
|
|
|
2013 |
* - $in (the content of $in has to en/decrypt by the generated code)
|
|
|
2014 |
* - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
|
|
|
2015 |
*
|
|
|
2016 |
*
|
|
|
2017 |
* @see self::_setup()
|
|
|
2018 |
* @see self::_createInlineCryptFunction()
|
|
|
2019 |
* @see self::encrypt()
|
|
|
2020 |
* @see self::decrypt()
|
|
|
2021 |
* @access private
|
|
|
2022 |
* @internal If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
|
|
|
2023 |
*/
|
|
|
2024 |
function _setupInlineCrypt()
|
|
|
2025 |
{
|
|
|
2026 |
// If, for any reason, an extending \phpseclib\Crypt\Base() \phpseclib\Crypt\* class
|
|
|
2027 |
// not using inline crypting then it must be ensured that: $this->use_inline_crypt = false
|
|
|
2028 |
// ie in the class var declaration of $use_inline_crypt in general for the \phpseclib\Crypt\* class,
|
|
|
2029 |
// in the constructor at object instance-time
|
|
|
2030 |
// or, if it's runtime-specific, at runtime
|
|
|
2031 |
|
|
|
2032 |
$this->use_inline_crypt = false;
|
|
|
2033 |
}
|
|
|
2034 |
|
|
|
2035 |
/**
|
|
|
2036 |
* Creates the performance-optimized function for en/decrypt()
|
|
|
2037 |
*
|
|
|
2038 |
* Internally for phpseclib developers:
|
|
|
2039 |
*
|
|
|
2040 |
* _createInlineCryptFunction():
|
|
|
2041 |
*
|
|
|
2042 |
* - merge the $cipher_code [setup'ed by _setupInlineCrypt()]
|
|
|
2043 |
* with the current [$this->]mode of operation code
|
|
|
2044 |
*
|
|
|
2045 |
* - create the $inline function, which called by encrypt() / decrypt()
|
|
|
2046 |
* as its replacement to speed up the en/decryption operations.
|
|
|
2047 |
*
|
|
|
2048 |
* - return the name of the created $inline callback function
|
|
|
2049 |
*
|
|
|
2050 |
* - used to speed up en/decryption
|
|
|
2051 |
*
|
|
|
2052 |
*
|
|
|
2053 |
*
|
|
|
2054 |
* The main reason why can speed up things [up to 50%] this way are:
|
|
|
2055 |
*
|
|
|
2056 |
* - using variables more effective then regular.
|
|
|
2057 |
* (ie no use of expensive arrays but integers $k_0, $k_1 ...
|
|
|
2058 |
* or even, for example, the pure $key[] values hardcoded)
|
|
|
2059 |
*
|
|
|
2060 |
* - avoiding 1000's of function calls of ie _encryptBlock()
|
|
|
2061 |
* but inlining the crypt operations.
|
|
|
2062 |
* in the mode of operation for() loop.
|
|
|
2063 |
*
|
|
|
2064 |
* - full loop unroll the (sometimes key-dependent) rounds
|
|
|
2065 |
* avoiding this way ++$i counters and runtime-if's etc...
|
|
|
2066 |
*
|
|
|
2067 |
* The basic code architectur of the generated $inline en/decrypt()
|
|
|
2068 |
* lambda function, in pseudo php, is:
|
|
|
2069 |
*
|
|
|
2070 |
* <code>
|
|
|
2071 |
* +----------------------------------------------------------------------------------------------+
|
|
|
2072 |
* | callback $inline = create_function: |
|
|
|
2073 |
* | lambda_function_0001_crypt_ECB($action, $text) |
|
|
|
2074 |
* | { |
|
|
|
2075 |
* | INSERT PHP CODE OF: |
|
|
|
2076 |
* | $cipher_code['init_crypt']; // general init code. |
|
|
|
2077 |
* | // ie: $sbox'es declarations used for |
|
|
|
2078 |
* | // encrypt and decrypt'ing. |
|
|
|
2079 |
* | |
|
|
|
2080 |
* | switch ($action) { |
|
|
|
2081 |
* | case 'encrypt': |
|
|
|
2082 |
* | INSERT PHP CODE OF: |
|
|
|
2083 |
* | $cipher_code['init_encrypt']; // encrypt sepcific init code. |
|
|
|
2084 |
* | ie: specified $key or $box |
|
|
|
2085 |
* | declarations for encrypt'ing. |
|
|
|
2086 |
* | |
|
|
|
2087 |
* | foreach ($ciphertext) { |
|
|
|
2088 |
* | $in = $block_size of $ciphertext; |
|
|
|
2089 |
* | |
|
|
|
2090 |
* | INSERT PHP CODE OF: |
|
|
|
2091 |
* | $cipher_code['encrypt_block']; // encrypt's (string) $in, which is always: |
|
|
|
2092 |
* | // strlen($in) == $this->block_size |
|
|
|
2093 |
* | // here comes the cipher algorithm in action |
|
|
|
2094 |
* | // for encryption. |
|
|
|
2095 |
* | // $cipher_code['encrypt_block'] has to |
|
|
|
2096 |
* | // encrypt the content of the $in variable |
|
|
|
2097 |
* | |
|
|
|
2098 |
* | $plaintext .= $in; |
|
|
|
2099 |
* | } |
|
|
|
2100 |
* | return $plaintext; |
|
|
|
2101 |
* | |
|
|
|
2102 |
* | case 'decrypt': |
|
|
|
2103 |
* | INSERT PHP CODE OF: |
|
|
|
2104 |
* | $cipher_code['init_decrypt']; // decrypt sepcific init code |
|
|
|
2105 |
* | ie: specified $key or $box |
|
|
|
2106 |
* | declarations for decrypt'ing. |
|
|
|
2107 |
* | foreach ($plaintext) { |
|
|
|
2108 |
* | $in = $block_size of $plaintext; |
|
|
|
2109 |
* | |
|
|
|
2110 |
* | INSERT PHP CODE OF: |
|
|
|
2111 |
* | $cipher_code['decrypt_block']; // decrypt's (string) $in, which is always |
|
|
|
2112 |
* | // strlen($in) == $this->block_size |
|
|
|
2113 |
* | // here comes the cipher algorithm in action |
|
|
|
2114 |
* | // for decryption. |
|
|
|
2115 |
* | // $cipher_code['decrypt_block'] has to |
|
|
|
2116 |
* | // decrypt the content of the $in variable |
|
|
|
2117 |
* | $ciphertext .= $in; |
|
|
|
2118 |
* | } |
|
|
|
2119 |
* | return $ciphertext; |
|
|
|
2120 |
* | } |
|
|
|
2121 |
* | } |
|
|
|
2122 |
* +----------------------------------------------------------------------------------------------+
|
|
|
2123 |
* </code>
|
|
|
2124 |
*
|
|
|
2125 |
* See also the \phpseclib\Crypt\*::_setupInlineCrypt()'s for
|
|
|
2126 |
* productive inline $cipher_code's how they works.
|
|
|
2127 |
*
|
|
|
2128 |
* Structure of:
|
|
|
2129 |
* <code>
|
|
|
2130 |
* $cipher_code = array(
|
|
|
2131 |
* 'init_crypt' => (string) '', // optional
|
|
|
2132 |
* 'init_encrypt' => (string) '', // optional
|
|
|
2133 |
* 'init_decrypt' => (string) '', // optional
|
|
|
2134 |
* 'encrypt_block' => (string) '', // required
|
|
|
2135 |
* 'decrypt_block' => (string) '' // required
|
|
|
2136 |
* );
|
|
|
2137 |
* </code>
|
|
|
2138 |
*
|
|
|
2139 |
* @see self::_setupInlineCrypt()
|
|
|
2140 |
* @see self::encrypt()
|
|
|
2141 |
* @see self::decrypt()
|
|
|
2142 |
* @param array $cipher_code
|
|
|
2143 |
* @access private
|
|
|
2144 |
* @return string (the name of the created callback function)
|
|
|
2145 |
*/
|
|
|
2146 |
function _createInlineCryptFunction($cipher_code)
|
|
|
2147 |
{
|
|
|
2148 |
$block_size = $this->block_size;
|
|
|
2149 |
|
|
|
2150 |
// optional
|
|
|
2151 |
$init_crypt = isset($cipher_code['init_crypt']) ? $cipher_code['init_crypt'] : '';
|
|
|
2152 |
$init_encrypt = isset($cipher_code['init_encrypt']) ? $cipher_code['init_encrypt'] : '';
|
|
|
2153 |
$init_decrypt = isset($cipher_code['init_decrypt']) ? $cipher_code['init_decrypt'] : '';
|
|
|
2154 |
// required
|
|
|
2155 |
$encrypt_block = $cipher_code['encrypt_block'];
|
|
|
2156 |
$decrypt_block = $cipher_code['decrypt_block'];
|
|
|
2157 |
|
|
|
2158 |
// Generating mode of operation inline code,
|
|
|
2159 |
// merged with the $cipher_code algorithm
|
|
|
2160 |
// for encrypt- and decryption.
|
|
|
2161 |
switch ($this->mode) {
|
|
|
2162 |
case self::MODE_ECB:
|
|
|
2163 |
$encrypt = $init_encrypt . '
|
|
|
2164 |
$_ciphertext = "";
|
|
|
2165 |
$_plaintext_len = strlen($_text);
|
|
|
2166 |
|
|
|
2167 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2168 |
$in = substr($_text, $_i, '.$block_size.');
|
|
|
2169 |
'.$encrypt_block.'
|
|
|
2170 |
$_ciphertext.= $in;
|
|
|
2171 |
}
|
|
|
2172 |
|
|
|
2173 |
return $_ciphertext;
|
|
|
2174 |
';
|
|
|
2175 |
|
|
|
2176 |
$decrypt = $init_decrypt . '
|
|
|
2177 |
$_plaintext = "";
|
|
|
2178 |
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
|
|
|
2179 |
$_ciphertext_len = strlen($_text);
|
|
|
2180 |
|
|
|
2181 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2182 |
$in = substr($_text, $_i, '.$block_size.');
|
|
|
2183 |
'.$decrypt_block.'
|
|
|
2184 |
$_plaintext.= $in;
|
|
|
2185 |
}
|
|
|
2186 |
|
|
|
2187 |
return $self->_unpad($_plaintext);
|
|
|
2188 |
';
|
|
|
2189 |
break;
|
|
|
2190 |
case self::MODE_CTR:
|
|
|
2191 |
$encrypt = $init_encrypt . '
|
|
|
2192 |
$_ciphertext = "";
|
|
|
2193 |
$_plaintext_len = strlen($_text);
|
|
|
2194 |
$_xor = $self->encryptIV;
|
|
|
2195 |
$_buffer = &$self->enbuffer;
|
|
|
2196 |
if (strlen($_buffer["ciphertext"])) {
|
|
|
2197 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2198 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2199 |
if (strlen($_block) > strlen($_buffer["ciphertext"])) {
|
|
|
2200 |
$in = $_xor;
|
|
|
2201 |
'.$encrypt_block.'
|
|
|
2202 |
$self->_increment_str($_xor);
|
|
|
2203 |
$_buffer["ciphertext"].= $in;
|
|
|
2204 |
}
|
|
|
2205 |
$_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
|
|
|
2206 |
$_ciphertext.= $_block ^ $_key;
|
|
|
2207 |
}
|
|
|
2208 |
} else {
|
|
|
2209 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2210 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2211 |
$in = $_xor;
|
|
|
2212 |
'.$encrypt_block.'
|
|
|
2213 |
$self->_increment_str($_xor);
|
|
|
2214 |
$_key = $in;
|
|
|
2215 |
$_ciphertext.= $_block ^ $_key;
|
|
|
2216 |
}
|
|
|
2217 |
}
|
|
|
2218 |
if ($self->continuousBuffer) {
|
|
|
2219 |
$self->encryptIV = $_xor;
|
|
|
2220 |
if ($_start = $_plaintext_len % '.$block_size.') {
|
|
|
2221 |
$_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
|
|
|
2222 |
}
|
|
|
2223 |
}
|
|
|
2224 |
|
|
|
2225 |
return $_ciphertext;
|
|
|
2226 |
';
|
|
|
2227 |
|
|
|
2228 |
$decrypt = $init_encrypt . '
|
|
|
2229 |
$_plaintext = "";
|
|
|
2230 |
$_ciphertext_len = strlen($_text);
|
|
|
2231 |
$_xor = $self->decryptIV;
|
|
|
2232 |
$_buffer = &$self->debuffer;
|
|
|
2233 |
|
|
|
2234 |
if (strlen($_buffer["ciphertext"])) {
|
|
|
2235 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2236 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2237 |
if (strlen($_block) > strlen($_buffer["ciphertext"])) {
|
|
|
2238 |
$in = $_xor;
|
|
|
2239 |
'.$encrypt_block.'
|
|
|
2240 |
$self->_increment_str($_xor);
|
|
|
2241 |
$_buffer["ciphertext"].= $in;
|
|
|
2242 |
}
|
|
|
2243 |
$_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
|
|
|
2244 |
$_plaintext.= $_block ^ $_key;
|
|
|
2245 |
}
|
|
|
2246 |
} else {
|
|
|
2247 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2248 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2249 |
$in = $_xor;
|
|
|
2250 |
'.$encrypt_block.'
|
|
|
2251 |
$self->_increment_str($_xor);
|
|
|
2252 |
$_key = $in;
|
|
|
2253 |
$_plaintext.= $_block ^ $_key;
|
|
|
2254 |
}
|
|
|
2255 |
}
|
|
|
2256 |
if ($self->continuousBuffer) {
|
|
|
2257 |
$self->decryptIV = $_xor;
|
|
|
2258 |
if ($_start = $_ciphertext_len % '.$block_size.') {
|
|
|
2259 |
$_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
|
|
|
2260 |
}
|
|
|
2261 |
}
|
|
|
2262 |
|
|
|
2263 |
return $_plaintext;
|
|
|
2264 |
';
|
|
|
2265 |
break;
|
|
|
2266 |
case self::MODE_CFB:
|
|
|
2267 |
$encrypt = $init_encrypt . '
|
|
|
2268 |
$_ciphertext = "";
|
|
|
2269 |
$_buffer = &$self->enbuffer;
|
|
|
2270 |
|
|
|
2271 |
if ($self->continuousBuffer) {
|
|
|
2272 |
$_iv = &$self->encryptIV;
|
|
|
2273 |
$_pos = &$_buffer["pos"];
|
|
|
2274 |
} else {
|
|
|
2275 |
$_iv = $self->encryptIV;
|
|
|
2276 |
$_pos = 0;
|
|
|
2277 |
}
|
|
|
2278 |
$_len = strlen($_text);
|
|
|
2279 |
$_i = 0;
|
|
|
2280 |
if ($_pos) {
|
|
|
2281 |
$_orig_pos = $_pos;
|
|
|
2282 |
$_max = '.$block_size.' - $_pos;
|
|
|
2283 |
if ($_len >= $_max) {
|
|
|
2284 |
$_i = $_max;
|
|
|
2285 |
$_len-= $_max;
|
|
|
2286 |
$_pos = 0;
|
|
|
2287 |
} else {
|
|
|
2288 |
$_i = $_len;
|
|
|
2289 |
$_pos+= $_len;
|
|
|
2290 |
$_len = 0;
|
|
|
2291 |
}
|
|
|
2292 |
$_ciphertext = substr($_iv, $_orig_pos) ^ $_text;
|
|
|
2293 |
$_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i);
|
|
|
2294 |
}
|
|
|
2295 |
while ($_len >= '.$block_size.') {
|
|
|
2296 |
$in = $_iv;
|
|
|
2297 |
'.$encrypt_block.';
|
|
|
2298 |
$_iv = $in ^ substr($_text, $_i, '.$block_size.');
|
|
|
2299 |
$_ciphertext.= $_iv;
|
|
|
2300 |
$_len-= '.$block_size.';
|
|
|
2301 |
$_i+= '.$block_size.';
|
|
|
2302 |
}
|
|
|
2303 |
if ($_len) {
|
|
|
2304 |
$in = $_iv;
|
|
|
2305 |
'.$encrypt_block.'
|
|
|
2306 |
$_iv = $in;
|
|
|
2307 |
$_block = $_iv ^ substr($_text, $_i);
|
|
|
2308 |
$_iv = substr_replace($_iv, $_block, 0, $_len);
|
|
|
2309 |
$_ciphertext.= $_block;
|
|
|
2310 |
$_pos = $_len;
|
|
|
2311 |
}
|
|
|
2312 |
return $_ciphertext;
|
|
|
2313 |
';
|
|
|
2314 |
|
|
|
2315 |
$decrypt = $init_encrypt . '
|
|
|
2316 |
$_plaintext = "";
|
|
|
2317 |
$_buffer = &$self->debuffer;
|
|
|
2318 |
|
|
|
2319 |
if ($self->continuousBuffer) {
|
|
|
2320 |
$_iv = &$self->decryptIV;
|
|
|
2321 |
$_pos = &$_buffer["pos"];
|
|
|
2322 |
} else {
|
|
|
2323 |
$_iv = $self->decryptIV;
|
|
|
2324 |
$_pos = 0;
|
|
|
2325 |
}
|
|
|
2326 |
$_len = strlen($_text);
|
|
|
2327 |
$_i = 0;
|
|
|
2328 |
if ($_pos) {
|
|
|
2329 |
$_orig_pos = $_pos;
|
|
|
2330 |
$_max = '.$block_size.' - $_pos;
|
|
|
2331 |
if ($_len >= $_max) {
|
|
|
2332 |
$_i = $_max;
|
|
|
2333 |
$_len-= $_max;
|
|
|
2334 |
$_pos = 0;
|
|
|
2335 |
} else {
|
|
|
2336 |
$_i = $_len;
|
|
|
2337 |
$_pos+= $_len;
|
|
|
2338 |
$_len = 0;
|
|
|
2339 |
}
|
|
|
2340 |
$_plaintext = substr($_iv, $_orig_pos) ^ $_text;
|
|
|
2341 |
$_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i);
|
|
|
2342 |
}
|
|
|
2343 |
while ($_len >= '.$block_size.') {
|
|
|
2344 |
$in = $_iv;
|
|
|
2345 |
'.$encrypt_block.'
|
|
|
2346 |
$_iv = $in;
|
|
|
2347 |
$cb = substr($_text, $_i, '.$block_size.');
|
|
|
2348 |
$_plaintext.= $_iv ^ $cb;
|
|
|
2349 |
$_iv = $cb;
|
|
|
2350 |
$_len-= '.$block_size.';
|
|
|
2351 |
$_i+= '.$block_size.';
|
|
|
2352 |
}
|
|
|
2353 |
if ($_len) {
|
|
|
2354 |
$in = $_iv;
|
|
|
2355 |
'.$encrypt_block.'
|
|
|
2356 |
$_iv = $in;
|
|
|
2357 |
$_plaintext.= $_iv ^ substr($_text, $_i);
|
|
|
2358 |
$_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len);
|
|
|
2359 |
$_pos = $_len;
|
|
|
2360 |
}
|
|
|
2361 |
|
|
|
2362 |
return $_plaintext;
|
|
|
2363 |
';
|
|
|
2364 |
break;
|
|
|
2365 |
case self::MODE_OFB:
|
|
|
2366 |
$encrypt = $init_encrypt . '
|
|
|
2367 |
$_ciphertext = "";
|
|
|
2368 |
$_plaintext_len = strlen($_text);
|
|
|
2369 |
$_xor = $self->encryptIV;
|
|
|
2370 |
$_buffer = &$self->enbuffer;
|
|
|
2371 |
|
|
|
2372 |
if (strlen($_buffer["xor"])) {
|
|
|
2373 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2374 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2375 |
if (strlen($_block) > strlen($_buffer["xor"])) {
|
|
|
2376 |
$in = $_xor;
|
|
|
2377 |
'.$encrypt_block.'
|
|
|
2378 |
$_xor = $in;
|
|
|
2379 |
$_buffer["xor"].= $_xor;
|
|
|
2380 |
}
|
|
|
2381 |
$_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
|
|
|
2382 |
$_ciphertext.= $_block ^ $_key;
|
|
|
2383 |
}
|
|
|
2384 |
} else {
|
|
|
2385 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2386 |
$in = $_xor;
|
|
|
2387 |
'.$encrypt_block.'
|
|
|
2388 |
$_xor = $in;
|
|
|
2389 |
$_ciphertext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
|
|
|
2390 |
}
|
|
|
2391 |
$_key = $_xor;
|
|
|
2392 |
}
|
|
|
2393 |
if ($self->continuousBuffer) {
|
|
|
2394 |
$self->encryptIV = $_xor;
|
|
|
2395 |
if ($_start = $_plaintext_len % '.$block_size.') {
|
|
|
2396 |
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
|
|
|
2397 |
}
|
|
|
2398 |
}
|
|
|
2399 |
return $_ciphertext;
|
|
|
2400 |
';
|
|
|
2401 |
|
|
|
2402 |
$decrypt = $init_encrypt . '
|
|
|
2403 |
$_plaintext = "";
|
|
|
2404 |
$_ciphertext_len = strlen($_text);
|
|
|
2405 |
$_xor = $self->decryptIV;
|
|
|
2406 |
$_buffer = &$self->debuffer;
|
|
|
2407 |
|
|
|
2408 |
if (strlen($_buffer["xor"])) {
|
|
|
2409 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2410 |
$_block = substr($_text, $_i, '.$block_size.');
|
|
|
2411 |
if (strlen($_block) > strlen($_buffer["xor"])) {
|
|
|
2412 |
$in = $_xor;
|
|
|
2413 |
'.$encrypt_block.'
|
|
|
2414 |
$_xor = $in;
|
|
|
2415 |
$_buffer["xor"].= $_xor;
|
|
|
2416 |
}
|
|
|
2417 |
$_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
|
|
|
2418 |
$_plaintext.= $_block ^ $_key;
|
|
|
2419 |
}
|
|
|
2420 |
} else {
|
|
|
2421 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2422 |
$in = $_xor;
|
|
|
2423 |
'.$encrypt_block.'
|
|
|
2424 |
$_xor = $in;
|
|
|
2425 |
$_plaintext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
|
|
|
2426 |
}
|
|
|
2427 |
$_key = $_xor;
|
|
|
2428 |
}
|
|
|
2429 |
if ($self->continuousBuffer) {
|
|
|
2430 |
$self->decryptIV = $_xor;
|
|
|
2431 |
if ($_start = $_ciphertext_len % '.$block_size.') {
|
|
|
2432 |
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
|
|
|
2433 |
}
|
|
|
2434 |
}
|
|
|
2435 |
return $_plaintext;
|
|
|
2436 |
';
|
|
|
2437 |
break;
|
|
|
2438 |
case self::MODE_STREAM:
|
|
|
2439 |
$encrypt = $init_encrypt . '
|
|
|
2440 |
$_ciphertext = "";
|
|
|
2441 |
'.$encrypt_block.'
|
|
|
2442 |
return $_ciphertext;
|
|
|
2443 |
';
|
|
|
2444 |
$decrypt = $init_decrypt . '
|
|
|
2445 |
$_plaintext = "";
|
|
|
2446 |
'.$decrypt_block.'
|
|
|
2447 |
return $_plaintext;
|
|
|
2448 |
';
|
|
|
2449 |
break;
|
|
|
2450 |
// case self::MODE_CBC:
|
|
|
2451 |
default:
|
|
|
2452 |
$encrypt = $init_encrypt . '
|
|
|
2453 |
$_ciphertext = "";
|
|
|
2454 |
$_plaintext_len = strlen($_text);
|
|
|
2455 |
|
|
|
2456 |
$in = $self->encryptIV;
|
|
|
2457 |
|
|
|
2458 |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
|
2459 |
$in = substr($_text, $_i, '.$block_size.') ^ $in;
|
|
|
2460 |
'.$encrypt_block.'
|
|
|
2461 |
$_ciphertext.= $in;
|
|
|
2462 |
}
|
|
|
2463 |
|
|
|
2464 |
if ($self->continuousBuffer) {
|
|
|
2465 |
$self->encryptIV = $in;
|
|
|
2466 |
}
|
|
|
2467 |
|
|
|
2468 |
return $_ciphertext;
|
|
|
2469 |
';
|
|
|
2470 |
|
|
|
2471 |
$decrypt = $init_decrypt . '
|
|
|
2472 |
$_plaintext = "";
|
|
|
2473 |
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
|
|
|
2474 |
$_ciphertext_len = strlen($_text);
|
|
|
2475 |
|
|
|
2476 |
$_iv = $self->decryptIV;
|
|
|
2477 |
|
|
|
2478 |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
|
2479 |
$in = $_block = substr($_text, $_i, '.$block_size.');
|
|
|
2480 |
'.$decrypt_block.'
|
|
|
2481 |
$_plaintext.= $in ^ $_iv;
|
|
|
2482 |
$_iv = $_block;
|
|
|
2483 |
}
|
|
|
2484 |
|
|
|
2485 |
if ($self->continuousBuffer) {
|
|
|
2486 |
$self->decryptIV = $_iv;
|
|
|
2487 |
}
|
|
|
2488 |
|
|
|
2489 |
return $self->_unpad($_plaintext);
|
|
|
2490 |
';
|
|
|
2491 |
break;
|
|
|
2492 |
}
|
|
|
2493 |
|
|
|
2494 |
// Create the $inline function and return its name as string. Ready to run!
|
|
|
2495 |
return create_function('$_action, &$self, $_text', $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }');
|
|
|
2496 |
}
|
|
|
2497 |
|
|
|
2498 |
/**
|
|
|
2499 |
* Holds the lambda_functions table (classwide)
|
|
|
2500 |
*
|
|
|
2501 |
* Each name of the lambda function, created from
|
|
|
2502 |
* _setupInlineCrypt() && _createInlineCryptFunction()
|
|
|
2503 |
* is stored, classwide (!), here for reusing.
|
|
|
2504 |
*
|
|
|
2505 |
* The string-based index of $function is a classwide
|
|
|
2506 |
* unique value representing, at least, the $mode of
|
|
|
2507 |
* operation (or more... depends of the optimizing level)
|
|
|
2508 |
* for which $mode the lambda function was created.
|
|
|
2509 |
*
|
|
|
2510 |
* @access private
|
|
|
2511 |
* @return array &$functions
|
|
|
2512 |
*/
|
|
|
2513 |
function &_getLambdaFunctions()
|
|
|
2514 |
{
|
|
|
2515 |
static $functions = array();
|
|
|
2516 |
return $functions;
|
|
|
2517 |
}
|
|
|
2518 |
|
|
|
2519 |
/**
|
|
|
2520 |
* Generates a digest from $bytes
|
|
|
2521 |
*
|
|
|
2522 |
* @see self::_setupInlineCrypt()
|
|
|
2523 |
* @access private
|
|
|
2524 |
* @param $bytes
|
|
|
2525 |
* @return string
|
|
|
2526 |
*/
|
|
|
2527 |
function _hashInlineCryptFunction($bytes)
|
|
|
2528 |
{
|
|
|
2529 |
if (!isset(self::$WHIRLPOOL_AVAILABLE)) {
|
|
|
2530 |
self::$WHIRLPOOL_AVAILABLE = extension_loaded('hash') && in_array('whirlpool', hash_algos());
|
|
|
2531 |
}
|
|
|
2532 |
|
|
|
2533 |
$result = '';
|
|
|
2534 |
$hash = $bytes;
|
|
|
2535 |
|
|
|
2536 |
switch (true) {
|
|
|
2537 |
case self::$WHIRLPOOL_AVAILABLE:
|
|
|
2538 |
foreach (str_split($bytes, 64) as $t) {
|
|
|
2539 |
$hash = hash('whirlpool', $hash, true);
|
|
|
2540 |
$result .= $t ^ $hash;
|
|
|
2541 |
}
|
|
|
2542 |
return $result . hash('whirlpool', $hash, true);
|
|
|
2543 |
default:
|
|
|
2544 |
$len = strlen($bytes);
|
|
|
2545 |
for ($i = 0; $i < $len; $i+=20) {
|
|
|
2546 |
$t = substr($bytes, $i, 20);
|
|
|
2547 |
$hash = pack('H*', sha1($hash));
|
|
|
2548 |
$result .= $t ^ $hash;
|
|
|
2549 |
}
|
|
|
2550 |
return $result . pack('H*', sha1($hash));
|
|
|
2551 |
}
|
|
|
2552 |
}
|
|
|
2553 |
}
|