1987 lines
76 KiB
PHP
1987 lines
76 KiB
PHP
<?php
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/**
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* Base Class for all Crypt_* cipher classes
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*
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* PHP versions 4 and 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 Crypt_* cipher class should extend 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 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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* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @category Crypt
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* @package Crypt_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 MMVII Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @version 1.0.1
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* @link http://phpseclib.sourceforge.net
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*/
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/**#@+
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* @access public
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* @see Crypt_Base::encrypt()
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* @see 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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define('CRYPT_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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define('CRYPT_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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define('CRYPT_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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define('CRYPT_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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define('CRYPT_MODE_OFB', 4);
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/**
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* Encrypt / decrypt using streaming mode.
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*
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*/
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define('CRYPT_MODE_STREAM', 5);
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/**#@-*/
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/**#@+
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* @access private
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* @see Crypt_Base::Crypt_Base()
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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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define('CRYPT_MODE_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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define('CRYPT_MODE_MCRYPT', 2);
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/**#@-*/
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/**
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* Base Class for all Crypt_* cipher classes
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*
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* @package Crypt_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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* @version 1.0.0
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* @access public
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*/
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class Crypt_Base
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{
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/**
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* The Encryption Mode
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*
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* @see Crypt_Base::Crypt_Base()
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* @var Integer
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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 Integer
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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 Crypt_Base::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 Crypt_Base::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 Crypt_Base::enableContinuousBuffer()
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* @see Crypt_Base::_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 Crypt_Base::enableContinuousBuffer()
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* @see Crypt_Base::_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 Crypt_Base::enableContinuousBuffer()
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* @var Boolean
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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 Crypt_Base::encrypt()
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* @see Crypt_Base::_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 Crypt_Base::decrypt()
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* @see Crypt_Base::_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 Crypt_Base::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 Crypt_Base::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 Crypt_Twofish::setKey()
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* @see Crypt_Twofish::setIV()
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* @var Boolean
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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 Crypt_Twofish::setKey()
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* @see Crypt_Twofish::setIV()
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* @var Boolean
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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 Crypt_Base::encrypt()
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* @see Crypt_Base::decrypt()
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* @see Crypt_Base::_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 == CRYPT_MODE_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 choosen 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 Crypt_Base::encrypt()
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* @var Integer
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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 setKey()
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* @see setIV()
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* @see disableContinuousBuffer()
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* @var Boolean
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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 Crypt_Base::enablePadding()
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* @var Boolean
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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 Crypt_Base::Crypt_Base()
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* @var Boolean
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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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* - CRYPT_MODE_MCRYPT (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
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* - CRYPT_MODE_INTERNAL (slower, pure php-engine, no php-extension required)
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*
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* In the pipeline... maybe. But currently not available:
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* - CRYPT_MODE_OPENSSL (very fast, php-extension: openssl, extension_loaded('openssl') required)
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*
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* If possible, CRYPT_MODE_MCRYPT will be used for each cipher.
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* Otherwise CRYPT_MODE_INTERNAL
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*
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* @see Crypt_Base::encrypt()
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* @see Crypt_Base::decrypt()
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* @var Integer
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* @access private
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*/
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var $engine;
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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 == CRYPT_MODE_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 Crypt_Base::_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 default password key_size used by setPassword()
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*
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* @see Crypt_Base::setPassword()
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* @var Integer
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* @access private
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*/
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var $password_key_size = 32;
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/**
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* The default salt used by setPassword()
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*
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* @see Crypt_Base::setPassword()
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* @var String
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* @access private
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*/
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var $password_default_salt = 'phpseclib/salt';
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/**
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* The namespace used by the cipher for its constants.
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*
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* ie: AES.php is using CRYPT_AES_MODE_* for its constants
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* so $const_namespace is AES
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*
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* DES.php is using CRYPT_DES_MODE_* for its constants
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* so $const_namespace is DES... and so on
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*
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* All CRYPT_<$const_namespace>_MODE_* are aliases of
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* the generic CRYPT_MODE_* constants, so both could be used
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* for each cipher.
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*
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* Example:
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* $aes = new Crypt_AES(CRYPT_AES_MODE_CFB); // $aes will operate in cfb mode
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* $aes = new Crypt_AES(CRYPT_MODE_CFB); // identical
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*
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* @see Crypt_Base::Crypt_Base()
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* @var String
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* @access private
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*/
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var $const_namespace;
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/**
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* The name of the performance-optimized callback function
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*
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* Used by encrypt() / decrypt()
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* only if $engine == CRYPT_MODE_INTERNAL
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*
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* @see Crypt_Base::encrypt()
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* @see Crypt_Base::decrypt()
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* @see Crypt_Base::_setupInlineCrypt()
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* @see Crypt_Base::$use_inline_crypt
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* @var Callback
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* @access private
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*/
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var $inline_crypt;
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/**
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* Holds whether performance-optimized $inline_crypt() can/should be used.
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*
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* @see Crypt_Base::encrypt()
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* @see Crypt_Base::decrypt()
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* @see Crypt_Base::inline_crypt
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* @var mixed
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* @access private
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*/
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var $use_inline_crypt;
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/**
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* Default Constructor.
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*
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* Determines whether or not the mcrypt extension should be used.
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*
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* $mode could be:
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*
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* - CRYPT_MODE_ECB
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*
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* - CRYPT_MODE_CBC
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*
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* - CRYPT_MODE_CTR
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*
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* - CRYPT_MODE_CFB
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*
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* - CRYPT_MODE_OFB
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*
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* (or the alias constants of the choosen cipher, for example for AES: CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC ...)
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*
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* If not explictly set, CRYPT_MODE_CBC will be used.
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*
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* @param optional Integer $mode
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* @access public
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*/
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function Crypt_Base($mode = CRYPT_MODE_CBC)
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{
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$const_crypt_mode = 'CRYPT_' . $this->const_namespace . '_MODE';
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// Determining the availibility of mcrypt support for the cipher
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if (!defined($const_crypt_mode)) {
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switch (true) {
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case extension_loaded('mcrypt') && in_array($this->cipher_name_mcrypt, mcrypt_list_algorithms()):
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define($const_crypt_mode, CRYPT_MODE_MCRYPT);
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break;
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default:
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define($const_crypt_mode, CRYPT_MODE_INTERNAL);
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}
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}
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// Determining which internal $engine should be used.
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// The fastes possible first.
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switch (true) {
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case empty($this->cipher_name_mcrypt): // The cipher module has no mcrypt-engine support at all so we force CRYPT_MODE_INTERNAL
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$this->engine = CRYPT_MODE_INTERNAL;
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break;
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case constant($const_crypt_mode) == CRYPT_MODE_MCRYPT:
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$this->engine = CRYPT_MODE_MCRYPT;
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break;
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default:
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$this->engine = CRYPT_MODE_INTERNAL;
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}
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// $mode dependent settings
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switch ($mode) {
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case CRYPT_MODE_ECB:
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$this->paddable = true;
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$this->mode = $mode;
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break;
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case CRYPT_MODE_CTR:
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case CRYPT_MODE_CFB:
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case CRYPT_MODE_OFB:
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case CRYPT_MODE_STREAM:
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$this->mode = $mode;
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break;
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case CRYPT_MODE_CBC:
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default:
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$this->paddable = true;
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$this->mode = CRYPT_MODE_CBC;
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}
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// Determining whether inline crypting can be used by the cipher
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if ($this->use_inline_crypt !== false && function_exists('create_function')) {
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$this->use_inline_crypt = true;
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}
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}
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/**
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* Sets the initialization vector. (optional)
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*
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* SetIV is not required when CRYPT_MODE_ECB (or ie for AES: CRYPT_AES_MODE_ECB) is being used. If not explictly set, it'll be assumed
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* to be all zero's.
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*
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* Note: Could, but not must, extend by the child Crypt_* class
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*
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* @access public
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* @param String $iv
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*/
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function setIV($iv)
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{
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if ($this->mode == CRYPT_MODE_ECB) {
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return;
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}
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$this->iv = $iv;
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$this->changed = true;
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}
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/**
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* Sets the key.
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*
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* The min/max length(s) of the key depends on the cipher which is used.
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* If the key not fits the length(s) of the cipher it will paded with null bytes
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* up to the closest valid key length. If the key is more than max length,
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* we trim the excess bits.
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*
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* If the key is not explicitly set, it'll be assumed to be all null bytes.
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*
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* Note: Could, but not must, extend by the child Crypt_* class
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*
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* @access public
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* @param String $key
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*/
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function setKey($key)
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{
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$this->key = $key;
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$this->changed = true;
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}
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/**
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* Sets the password.
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*
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* Depending on what $method is set to, setPassword()'s (optional) parameters are as follows:
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* {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2}:
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* $hash, $salt, $count, $dkLen
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*
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* Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
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*
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* Note: Could, but not must, extend by the child Crypt_* class
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*
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* @see Crypt/Hash.php
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* @param String $password
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* @param optional String $method
|
|
* @access public
|
|
*/
|
|
function setPassword($password, $method = 'pbkdf2')
|
|
{
|
|
$key = '';
|
|
|
|
switch ($method) {
|
|
default: // 'pbkdf2'
|
|
$func_args = func_get_args();
|
|
|
|
// Hash function
|
|
$hash = isset($func_args[2]) ? $func_args[2] : 'sha1';
|
|
|
|
// WPA and WPA2 use the SSID as the salt
|
|
$salt = isset($func_args[3]) ? $func_args[3] : $this->password_default_salt;
|
|
|
|
// RFC2898#section-4.2 uses 1,000 iterations by default
|
|
// WPA and WPA2 use 4,096.
|
|
$count = isset($func_args[4]) ? $func_args[4] : 1000;
|
|
|
|
// Keylength
|
|
$dkLen = isset($func_args[5]) ? $func_args[5] : $this->password_key_size;
|
|
|
|
// Determining if php[>=5.5.0]'s hash_pbkdf2() function avail- and useable
|
|
switch (true) {
|
|
case !function_exists('hash_pbkdf2'):
|
|
case !function_exists('hash_algos'):
|
|
case !in_array($hash, hash_algos()):
|
|
if (!class_exists('Crypt_Hash')) {
|
|
include_once 'Crypt/Hash.php';
|
|
}
|
|
$i = 1;
|
|
while (strlen($key) < $dkLen) {
|
|
$hmac = new Crypt_Hash();
|
|
$hmac->setHash($hash);
|
|
$hmac->setKey($password);
|
|
$f = $u = $hmac->hash($salt . pack('N', $i++));
|
|
for ($j = 2; $j <= $count; ++$j) {
|
|
$u = $hmac->hash($u);
|
|
$f^= $u;
|
|
}
|
|
$key.= $f;
|
|
}
|
|
$key = substr($key, 0, $dkLen);
|
|
break;
|
|
default:
|
|
$key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true);
|
|
}
|
|
}
|
|
|
|
$this->setKey($key);
|
|
}
|
|
|
|
/**
|
|
* Encrypts a message.
|
|
*
|
|
* $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher
|
|
* implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's
|
|
* necessary are discussed in the following
|
|
* URL:
|
|
*
|
|
* {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
|
|
*
|
|
* An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
|
|
* strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
|
|
* length.
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see Crypt_Base::decrypt()
|
|
* @access public
|
|
* @param String $plaintext
|
|
* @return String $cipertext
|
|
*/
|
|
function encrypt($plaintext)
|
|
{
|
|
if ($this->engine == CRYPT_MODE_MCRYPT) {
|
|
if ($this->changed) {
|
|
$this->_setupMcrypt();
|
|
$this->changed = false;
|
|
}
|
|
if ($this->enchanged) {
|
|
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
|
$this->enchanged = false;
|
|
}
|
|
|
|
// re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
|
|
// using mcrypt's default handing of CFB the above would output two different things. using phpseclib's
|
|
// rewritten CFB implementation the above outputs the same thing twice.
|
|
if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
|
|
$block_size = $this->block_size;
|
|
$iv = &$this->encryptIV;
|
|
$pos = &$this->enbuffer['pos'];
|
|
$len = strlen($plaintext);
|
|
$ciphertext = '';
|
|
$i = 0;
|
|
if ($pos) {
|
|
$orig_pos = $pos;
|
|
$max = $block_size - $pos;
|
|
if ($len >= $max) {
|
|
$i = $max;
|
|
$len-= $max;
|
|
$pos = 0;
|
|
} else {
|
|
$i = $len;
|
|
$pos+= $len;
|
|
$len = 0;
|
|
}
|
|
$ciphertext = substr($iv, $orig_pos) ^ $plaintext;
|
|
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
|
|
$this->enbuffer['enmcrypt_init'] = true;
|
|
}
|
|
if ($len >= $block_size) {
|
|
if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
|
|
if ($this->enbuffer['enmcrypt_init'] === true) {
|
|
mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
|
|
$this->enbuffer['enmcrypt_init'] = false;
|
|
}
|
|
$ciphertext.= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
|
|
$iv = substr($ciphertext, -$block_size);
|
|
$len%= $block_size;
|
|
} else {
|
|
while ($len >= $block_size) {
|
|
$iv = mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
|
|
$ciphertext.= $iv;
|
|
$len-= $block_size;
|
|
$i+= $block_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($len) {
|
|
$iv = mcrypt_generic($this->ecb, $iv);
|
|
$block = $iv ^ substr($plaintext, -$len);
|
|
$iv = substr_replace($iv, $block, 0, $len);
|
|
$ciphertext.= $block;
|
|
$pos = $len;
|
|
}
|
|
|
|
return $ciphertext;
|
|
}
|
|
|
|
if ($this->paddable) {
|
|
$plaintext = $this->_pad($plaintext);
|
|
}
|
|
|
|
$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
|
|
|
|
if (!$this->continuousBuffer) {
|
|
mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
|
|
}
|
|
|
|
return $ciphertext;
|
|
}
|
|
|
|
if ($this->changed) {
|
|
$this->_setup();
|
|
$this->changed = false;
|
|
}
|
|
if ($this->use_inline_crypt) {
|
|
$inline = $this->inline_crypt;
|
|
return $inline('encrypt', $this, $plaintext);
|
|
}
|
|
if ($this->paddable) {
|
|
$plaintext = $this->_pad($plaintext);
|
|
}
|
|
|
|
$buffer = &$this->enbuffer;
|
|
$block_size = $this->block_size;
|
|
$ciphertext = '';
|
|
switch ($this->mode) {
|
|
case CRYPT_MODE_ECB:
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CBC:
|
|
$xor = $this->encryptIV;
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$block = substr($plaintext, $i, $block_size);
|
|
$block = $this->_encryptBlock($block ^ $xor);
|
|
$xor = $block;
|
|
$ciphertext.= $block;
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->encryptIV = $xor;
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CTR:
|
|
$xor = $this->encryptIV;
|
|
if (strlen($buffer['encrypted'])) {
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$block = substr($plaintext, $i, $block_size);
|
|
if (strlen($block) > strlen($buffer['encrypted'])) {
|
|
$buffer['encrypted'].= $this->_encryptBlock($this->_generateXor($xor, $block_size));
|
|
}
|
|
$key = $this->_stringShift($buffer['encrypted'], $block_size);
|
|
$ciphertext.= $block ^ $key;
|
|
}
|
|
} else {
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$block = substr($plaintext, $i, $block_size);
|
|
$key = $this->_encryptBlock($this->_generateXor($xor, $block_size));
|
|
$ciphertext.= $block ^ $key;
|
|
}
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->encryptIV = $xor;
|
|
if ($start = strlen($plaintext) % $block_size) {
|
|
$buffer['encrypted'] = substr($key, $start) . $buffer['encrypted'];
|
|
}
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CFB:
|
|
// cfb loosely routines inspired by openssl's:
|
|
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
|
|
if ($this->continuousBuffer) {
|
|
$iv = &$this->encryptIV;
|
|
$pos = &$buffer['pos'];
|
|
} else {
|
|
$iv = $this->encryptIV;
|
|
$pos = 0;
|
|
}
|
|
$len = strlen($plaintext);
|
|
$i = 0;
|
|
if ($pos) {
|
|
$orig_pos = $pos;
|
|
$max = $block_size - $pos;
|
|
if ($len >= $max) {
|
|
$i = $max;
|
|
$len-= $max;
|
|
$pos = 0;
|
|
} else {
|
|
$i = $len;
|
|
$pos+= $len;
|
|
$len = 0;
|
|
}
|
|
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
$ciphertext = substr($iv, $orig_pos) ^ $plaintext;
|
|
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
|
|
}
|
|
while ($len >= $block_size) {
|
|
$iv = $this->_encryptBlock($iv) ^ substr($plaintext, $i, $block_size);
|
|
$ciphertext.= $iv;
|
|
$len-= $block_size;
|
|
$i+= $block_size;
|
|
}
|
|
if ($len) {
|
|
$iv = $this->_encryptBlock($iv);
|
|
$block = $iv ^ substr($plaintext, $i);
|
|
$iv = substr_replace($iv, $block, 0, $len);
|
|
$ciphertext.= $block;
|
|
$pos = $len;
|
|
}
|
|
break;
|
|
case CRYPT_MODE_OFB:
|
|
$xor = $this->encryptIV;
|
|
if (strlen($buffer['xor'])) {
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$block = substr($plaintext, $i, $block_size);
|
|
if (strlen($block) > strlen($buffer['xor'])) {
|
|
$xor = $this->_encryptBlock($xor);
|
|
$buffer['xor'].= $xor;
|
|
}
|
|
$key = $this->_stringShift($buffer['xor'], $block_size);
|
|
$ciphertext.= $block ^ $key;
|
|
}
|
|
} else {
|
|
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
|
|
$xor = $this->_encryptBlock($xor);
|
|
$ciphertext.= substr($plaintext, $i, $block_size) ^ $xor;
|
|
}
|
|
$key = $xor;
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->encryptIV = $xor;
|
|
if ($start = strlen($plaintext) % $block_size) {
|
|
$buffer['xor'] = substr($key, $start) . $buffer['xor'];
|
|
}
|
|
}
|
|
break;
|
|
case CRYPT_MODE_STREAM:
|
|
$ciphertext = $this->_encryptBlock($plaintext);
|
|
break;
|
|
}
|
|
|
|
return $ciphertext;
|
|
}
|
|
|
|
/**
|
|
* Decrypts a message.
|
|
*
|
|
* If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
|
|
* it is.
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see Crypt_Base::encrypt()
|
|
* @access public
|
|
* @param String $ciphertext
|
|
* @return String $plaintext
|
|
*/
|
|
function decrypt($ciphertext)
|
|
{
|
|
if ($this->engine == CRYPT_MODE_MCRYPT) {
|
|
$block_size = $this->block_size;
|
|
if ($this->changed) {
|
|
$this->_setupMcrypt();
|
|
$this->changed = false;
|
|
}
|
|
if ($this->dechanged) {
|
|
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
|
$this->dechanged = false;
|
|
}
|
|
|
|
if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
|
|
$iv = &$this->decryptIV;
|
|
$pos = &$this->debuffer['pos'];
|
|
$len = strlen($ciphertext);
|
|
$plaintext = '';
|
|
$i = 0;
|
|
if ($pos) {
|
|
$orig_pos = $pos;
|
|
$max = $block_size - $pos;
|
|
if ($len >= $max) {
|
|
$i = $max;
|
|
$len-= $max;
|
|
$pos = 0;
|
|
} else {
|
|
$i = $len;
|
|
$pos+= $len;
|
|
$len = 0;
|
|
}
|
|
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
|
|
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
|
|
}
|
|
if ($len >= $block_size) {
|
|
$cb = substr($ciphertext, $i, $len - $len % $block_size);
|
|
$plaintext.= mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
|
|
$iv = substr($cb, -$block_size);
|
|
$len%= $block_size;
|
|
}
|
|
if ($len) {
|
|
$iv = mcrypt_generic($this->ecb, $iv);
|
|
$plaintext.= $iv ^ substr($ciphertext, -$len);
|
|
$iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
|
|
$pos = $len;
|
|
}
|
|
|
|
return $plaintext;
|
|
}
|
|
|
|
if ($this->paddable) {
|
|
// we pad with chr(0) since that's what mcrypt_generic does. to quote from {@link http://www.php.net/function.mcrypt-generic}:
|
|
// "The data is padded with "\0" to make sure the length of the data is n * blocksize."
|
|
$ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($block_size - strlen($ciphertext) % $block_size) % $block_size, chr(0));
|
|
}
|
|
|
|
$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
|
|
|
|
if (!$this->continuousBuffer) {
|
|
mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
|
|
}
|
|
|
|
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
|
|
}
|
|
|
|
if ($this->changed) {
|
|
$this->_setup();
|
|
$this->changed = false;
|
|
}
|
|
if ($this->use_inline_crypt) {
|
|
$inline = $this->inline_crypt;
|
|
return $inline('decrypt', $this, $ciphertext);
|
|
}
|
|
|
|
$block_size = $this->block_size;
|
|
if ($this->paddable) {
|
|
// we pad with chr(0) since that's what mcrypt_generic does [...]
|
|
$ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($block_size - strlen($ciphertext) % $block_size) % $block_size, chr(0));
|
|
}
|
|
|
|
$buffer = &$this->debuffer;
|
|
$plaintext = '';
|
|
switch ($this->mode) {
|
|
case CRYPT_MODE_ECB:
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CBC:
|
|
$xor = $this->decryptIV;
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$block = substr($ciphertext, $i, $block_size);
|
|
$plaintext.= $this->_decryptBlock($block) ^ $xor;
|
|
$xor = $block;
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->decryptIV = $xor;
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CTR:
|
|
$xor = $this->decryptIV;
|
|
if (strlen($buffer['ciphertext'])) {
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$block = substr($ciphertext, $i, $block_size);
|
|
if (strlen($block) > strlen($buffer['ciphertext'])) {
|
|
$buffer['ciphertext'].= $this->_encryptBlock($this->_generateXor($xor, $block_size));
|
|
}
|
|
$key = $this->_stringShift($buffer['ciphertext'], $block_size);
|
|
$plaintext.= $block ^ $key;
|
|
}
|
|
} else {
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$block = substr($ciphertext, $i, $block_size);
|
|
$key = $this->_encryptBlock($this->_generateXor($xor, $block_size));
|
|
$plaintext.= $block ^ $key;
|
|
}
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->decryptIV = $xor;
|
|
if ($start = strlen($ciphertext) % $block_size) {
|
|
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
|
|
}
|
|
}
|
|
break;
|
|
case CRYPT_MODE_CFB:
|
|
if ($this->continuousBuffer) {
|
|
$iv = &$this->decryptIV;
|
|
$pos = &$buffer['pos'];
|
|
} else {
|
|
$iv = $this->decryptIV;
|
|
$pos = 0;
|
|
}
|
|
$len = strlen($ciphertext);
|
|
$i = 0;
|
|
if ($pos) {
|
|
$orig_pos = $pos;
|
|
$max = $block_size - $pos;
|
|
if ($len >= $max) {
|
|
$i = $max;
|
|
$len-= $max;
|
|
$pos = 0;
|
|
} else {
|
|
$i = $len;
|
|
$pos+= $len;
|
|
$len = 0;
|
|
}
|
|
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
|
|
$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
|
|
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
|
|
}
|
|
while ($len >= $block_size) {
|
|
$iv = $this->_encryptBlock($iv);
|
|
$cb = substr($ciphertext, $i, $block_size);
|
|
$plaintext.= $iv ^ $cb;
|
|
$iv = $cb;
|
|
$len-= $block_size;
|
|
$i+= $block_size;
|
|
}
|
|
if ($len) {
|
|
$iv = $this->_encryptBlock($iv);
|
|
$plaintext.= $iv ^ substr($ciphertext, $i);
|
|
$iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
|
|
$pos = $len;
|
|
}
|
|
break;
|
|
case CRYPT_MODE_OFB:
|
|
$xor = $this->decryptIV;
|
|
if (strlen($buffer['xor'])) {
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$block = substr($ciphertext, $i, $block_size);
|
|
if (strlen($block) > strlen($buffer['xor'])) {
|
|
$xor = $this->_encryptBlock($xor);
|
|
$buffer['xor'].= $xor;
|
|
}
|
|
$key = $this->_stringShift($buffer['xor'], $block_size);
|
|
$plaintext.= $block ^ $key;
|
|
}
|
|
} else {
|
|
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
|
|
$xor = $this->_encryptBlock($xor);
|
|
$plaintext.= substr($ciphertext, $i, $block_size) ^ $xor;
|
|
}
|
|
$key = $xor;
|
|
}
|
|
if ($this->continuousBuffer) {
|
|
$this->decryptIV = $xor;
|
|
if ($start = strlen($ciphertext) % $block_size) {
|
|
$buffer['xor'] = substr($key, $start) . $buffer['xor'];
|
|
}
|
|
}
|
|
break;
|
|
case CRYPT_MODE_STREAM:
|
|
$plaintext = $this->_decryptBlock($ciphertext);
|
|
break;
|
|
}
|
|
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
|
|
}
|
|
|
|
/**
|
|
* Pad "packets".
|
|
*
|
|
* Block ciphers working by encrypting between their specified [$this->]block_size at a time
|
|
* If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
|
|
* pad the input so that it is of the proper length.
|
|
*
|
|
* Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH,
|
|
* where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping
|
|
* away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
|
|
* transmitted separately)
|
|
*
|
|
* @see Crypt_Base::disablePadding()
|
|
* @access public
|
|
*/
|
|
function enablePadding()
|
|
{
|
|
$this->padding = true;
|
|
}
|
|
|
|
/**
|
|
* Do not pad packets.
|
|
*
|
|
* @see Crypt_Base::enablePadding()
|
|
* @access public
|
|
*/
|
|
function disablePadding()
|
|
{
|
|
$this->padding = false;
|
|
}
|
|
|
|
/**
|
|
* Treat consecutive "packets" as if they are a continuous buffer.
|
|
*
|
|
* Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets
|
|
* will yield different outputs:
|
|
*
|
|
* <code>
|
|
* echo $rijndael->encrypt(substr($plaintext, 0, 16));
|
|
* echo $rijndael->encrypt(substr($plaintext, 16, 16));
|
|
* </code>
|
|
* <code>
|
|
* echo $rijndael->encrypt($plaintext);
|
|
* </code>
|
|
*
|
|
* The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates
|
|
* another, as demonstrated with the following:
|
|
*
|
|
* <code>
|
|
* $rijndael->encrypt(substr($plaintext, 0, 16));
|
|
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
|
|
* </code>
|
|
* <code>
|
|
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
|
|
* </code>
|
|
*
|
|
* With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different
|
|
* outputs. The reason is due to the fact that the initialization vector's change after every encryption /
|
|
* decryption round when the continuous buffer is enabled. When it's disabled, they remain constant.
|
|
*
|
|
* Put another way, when the continuous buffer is enabled, the state of the Crypt_*() object changes after each
|
|
* encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that
|
|
* continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them),
|
|
* however, they are also less intuitive and more likely to cause you problems.
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see Crypt_Base::disableContinuousBuffer()
|
|
* @access public
|
|
*/
|
|
function enableContinuousBuffer()
|
|
{
|
|
if ($this->mode == CRYPT_MODE_ECB) {
|
|
return;
|
|
}
|
|
|
|
$this->continuousBuffer = true;
|
|
}
|
|
|
|
/**
|
|
* Treat consecutive packets as if they are a discontinuous buffer.
|
|
*
|
|
* The default behavior.
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see Crypt_Base::enableContinuousBuffer()
|
|
* @access public
|
|
*/
|
|
function disableContinuousBuffer()
|
|
{
|
|
if ($this->mode == CRYPT_MODE_ECB) {
|
|
return;
|
|
}
|
|
if (!$this->continuousBuffer) {
|
|
return;
|
|
}
|
|
|
|
$this->continuousBuffer = false;
|
|
$this->changed = true;
|
|
}
|
|
|
|
/**
|
|
* Encrypts a block
|
|
*
|
|
* Note: Must extend by the child Crypt_* class
|
|
*
|
|
* @access private
|
|
* @param String $in
|
|
* @return String
|
|
*/
|
|
function _encryptBlock($in)
|
|
{
|
|
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* Decrypts a block
|
|
*
|
|
* Note: Must extend by the child Crypt_* class
|
|
*
|
|
* @access private
|
|
* @param String $in
|
|
* @return String
|
|
*/
|
|
function _decryptBlock($in)
|
|
{
|
|
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* Setup the key (expansion)
|
|
*
|
|
* Only used if $engine == CRYPT_MODE_INTERNAL
|
|
*
|
|
* Note: Must extend by the child Crypt_* class
|
|
*
|
|
* @see Crypt_Base::_setup()
|
|
* @access private
|
|
*/
|
|
function _setupKey()
|
|
{
|
|
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* Setup the CRYPT_MODE_INTERNAL $engine
|
|
*
|
|
* (re)init, if necessary, the internal cipher $engine and flush all $buffers
|
|
* Used (only) if $engine == CRYPT_MODE_INTERNAL
|
|
*
|
|
* _setup() will be called each time if $changed === true
|
|
* typically this happens when using one or more of following public methods:
|
|
*
|
|
* - setKey()
|
|
*
|
|
* - setIV()
|
|
*
|
|
* - disableContinuousBuffer()
|
|
*
|
|
* - First run of encrypt() / decrypt() with no init-settings
|
|
*
|
|
* Internally: _setup() is called always before(!) en/decryption.
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see setKey()
|
|
* @see setIV()
|
|
* @see disableContinuousBuffer()
|
|
* @access private
|
|
*/
|
|
function _setup()
|
|
{
|
|
$this->_clearBuffers();
|
|
$this->_setupKey();
|
|
|
|
if ($this->use_inline_crypt) {
|
|
$this->_setupInlineCrypt();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Setup the CRYPT_MODE_MCRYPT $engine
|
|
*
|
|
* (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
|
|
* Used (only) if $engine = CRYPT_MODE_MCRYPT
|
|
*
|
|
* _setupMcrypt() will be called each time if $changed === true
|
|
* typically this happens when using one or more of following public methods:
|
|
*
|
|
* - setKey()
|
|
*
|
|
* - setIV()
|
|
*
|
|
* - disableContinuousBuffer()
|
|
*
|
|
* - First run of encrypt() / decrypt()
|
|
*
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @see setKey()
|
|
* @see setIV()
|
|
* @see disableContinuousBuffer()
|
|
* @access private
|
|
*/
|
|
function _setupMcrypt()
|
|
{
|
|
$this->_clearBuffers();
|
|
$this->enchanged = $this->dechanged = true;
|
|
|
|
if (!isset($this->enmcrypt)) {
|
|
static $mcrypt_modes = array(
|
|
CRYPT_MODE_CTR => 'ctr',
|
|
CRYPT_MODE_ECB => MCRYPT_MODE_ECB,
|
|
CRYPT_MODE_CBC => MCRYPT_MODE_CBC,
|
|
CRYPT_MODE_CFB => 'ncfb',
|
|
CRYPT_MODE_OFB => MCRYPT_MODE_NOFB,
|
|
CRYPT_MODE_STREAM => MCRYPT_MODE_STREAM,
|
|
);
|
|
|
|
$this->demcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
|
|
$this->enmcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
|
|
|
|
// we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
|
|
// to workaround mcrypt's broken ncfb implementation in buffered mode
|
|
// see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
|
|
if ($this->mode == CRYPT_MODE_CFB) {
|
|
$this->ecb = mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
|
|
}
|
|
|
|
} // else should mcrypt_generic_deinit be called?
|
|
|
|
if ($this->mode == CRYPT_MODE_CFB) {
|
|
mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pads a string
|
|
*
|
|
* Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
|
|
* $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to
|
|
* chr($this->block_size - (strlen($text) % $this->block_size)
|
|
*
|
|
* If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
|
|
* and padding will, hence forth, be enabled.
|
|
*
|
|
* @see Crypt_Base::_unpad()
|
|
* @param String $text
|
|
* @access private
|
|
* @return String
|
|
*/
|
|
function _pad($text)
|
|
{
|
|
$length = strlen($text);
|
|
|
|
if (!$this->padding) {
|
|
if ($length % $this->block_size == 0) {
|
|
return $text;
|
|
} else {
|
|
user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})");
|
|
$this->padding = true;
|
|
}
|
|
}
|
|
|
|
$pad = $this->block_size - ($length % $this->block_size);
|
|
|
|
return str_pad($text, $length + $pad, chr($pad));
|
|
}
|
|
|
|
/**
|
|
* Unpads a string.
|
|
*
|
|
* If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
|
|
* and false will be returned.
|
|
*
|
|
* @see Crypt_Base::_pad()
|
|
* @param String $text
|
|
* @access private
|
|
* @return String
|
|
*/
|
|
function _unpad($text)
|
|
{
|
|
if (!$this->padding) {
|
|
return $text;
|
|
}
|
|
|
|
$length = ord($text[strlen($text) - 1]);
|
|
|
|
if (!$length || $length > $this->block_size) {
|
|
return false;
|
|
}
|
|
|
|
return substr($text, 0, -$length);
|
|
}
|
|
|
|
/**
|
|
* Clears internal buffers
|
|
*
|
|
* Clearing/resetting the internal buffers is done everytime
|
|
* after disableContinuousBuffer() or on cipher $engine (re)init
|
|
* ie after setKey() or setIV()
|
|
*
|
|
* Note: Could, but not must, extend by the child Crypt_* class
|
|
*
|
|
* @access public
|
|
*/
|
|
function _clearBuffers()
|
|
{
|
|
$this->enbuffer = array('encrypted' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);
|
|
$this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'demcrypt_init' => true);
|
|
|
|
// mcrypt's handling of invalid's $iv:
|
|
// $this->encryptIV = $this->decryptIV = strlen($this->iv) == $this->block_size ? $this->iv : str_repeat("\0", $this->block_size);
|
|
$this->encryptIV = $this->decryptIV = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, "\0");
|
|
}
|
|
|
|
/**
|
|
* String Shift
|
|
*
|
|
* Inspired by array_shift
|
|
*
|
|
* @param String $string
|
|
* @param optional Integer $index
|
|
* @access private
|
|
* @return String
|
|
*/
|
|
function _stringShift(&$string, $index = 1)
|
|
{
|
|
$substr = substr($string, 0, $index);
|
|
$string = substr($string, $index);
|
|
return $substr;
|
|
}
|
|
|
|
/**
|
|
* Generate CTR XOR encryption key
|
|
*
|
|
* Encrypt the output of this and XOR it against the ciphertext / plaintext to get the
|
|
* plaintext / ciphertext in CTR mode.
|
|
*
|
|
* @see Crypt_Base::decrypt()
|
|
* @see Crypt_Base::encrypt()
|
|
* @param String $iv
|
|
* @param Integer $length
|
|
* @access private
|
|
* @return String $xor
|
|
*/
|
|
function _generateXor(&$iv, $length)
|
|
{
|
|
$xor = '';
|
|
$block_size = $this->block_size;
|
|
$num_blocks = floor(($length + ($block_size - 1)) / $block_size);
|
|
for ($i = 0; $i < $num_blocks; $i++) {
|
|
$xor.= $iv;
|
|
for ($j = 4; $j <= $block_size; $j+= 4) {
|
|
$temp = substr($iv, -$j, 4);
|
|
switch ($temp) {
|
|
case "\xFF\xFF\xFF\xFF":
|
|
$iv = substr_replace($iv, "\x00\x00\x00\x00", -$j, 4);
|
|
break;
|
|
case "\x7F\xFF\xFF\xFF":
|
|
$iv = substr_replace($iv, "\x80\x00\x00\x00", -$j, 4);
|
|
break 2;
|
|
default:
|
|
extract(unpack('Ncount', $temp));
|
|
$iv = substr_replace($iv, pack('N', $count + 1), -$j, 4);
|
|
break 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $xor;
|
|
}
|
|
|
|
/**
|
|
* Setup the performance-optimized function for de/encrypt()
|
|
*
|
|
* Stores the created (or existing) callback function-name
|
|
* in $this->inline_crypt
|
|
*
|
|
* Internally for phpseclib developers:
|
|
*
|
|
* _setupInlineCrypt() would be called only if:
|
|
*
|
|
* - $engine == CRYPT_MODE_INTERNAL and
|
|
*
|
|
* - $use_inline_crypt === true
|
|
*
|
|
* - each time on _setup(), after(!) _setupKey()
|
|
*
|
|
*
|
|
* This ensures that _setupInlineCrypt() has allways a
|
|
* full ready2go initializated internal cipher $engine state
|
|
* where, for example, the keys allready expanded,
|
|
* keys/block_size calculated and such.
|
|
*
|
|
* It is, each time if called, the responsibility of _setupInlineCrypt():
|
|
*
|
|
* - to set $this->inline_crypt to a valid and fully working callback function
|
|
* as a (faster) replacement for encrypt() / decrypt()
|
|
*
|
|
* - NOT to create unlimited callback functions (for memory reasons!)
|
|
* no matter how often _setupInlineCrypt() would be called. At some
|
|
* point of amount they must be generic re-useable.
|
|
*
|
|
* - the code of _setupInlineCrypt() it self,
|
|
* and the generated callback code,
|
|
* must be, in following order:
|
|
* - 100% safe
|
|
* - 100% compatible to encrypt()/decrypt()
|
|
* - using only php5+ features/lang-constructs/php-extensions if
|
|
* compatibility (down to php4) or fallback is provided
|
|
* - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-)
|
|
* - >= 10% faster than encrypt()/decrypt() [which is, by the way,
|
|
* the reason for the existence of _setupInlineCrypt() :-)]
|
|
* - memory-nice
|
|
* - short (as good as possible)
|
|
*
|
|
* Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
|
|
* - In case of using inline crypting, _setupInlineCrypt() must extend by the child Crypt_* class.
|
|
* - The following variable names are reserved:
|
|
* - $_* (all variable names prefixed with an underscore)
|
|
* - $self (object reference to it self. Do not use $this, but $self instead)
|
|
* - $in (the content of $in has to en/decrypt by the generated code)
|
|
* - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
|
|
*
|
|
*
|
|
* @see Crypt_Base::_setup()
|
|
* @see Crypt_Base::_createInlineCryptFunction()
|
|
* @see Crypt_Base::encrypt()
|
|
* @see Crypt_Base::decrypt()
|
|
* @access private
|
|
*/
|
|
function _setupInlineCrypt()
|
|
{
|
|
// If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
|
|
|
|
// If, for any reason, an extending Crypt_Base() Crypt_* class
|
|
// not using inline crypting then it must be ensured that: $this->use_inline_crypt = false
|
|
// ie in the class var declaration of $use_inline_crypt in general for the Crypt_* class,
|
|
// in the constructor at object instance-time
|
|
// or, if it's runtime-specific, at runtime
|
|
|
|
$this->use_inline_crypt = false;
|
|
}
|
|
|
|
/**
|
|
* Creates the performance-optimized function for en/decrypt()
|
|
*
|
|
* Internally for phpseclib developers:
|
|
*
|
|
* _createInlineCryptFunction():
|
|
*
|
|
* - merge the $cipher_code [setup'ed by _setupInlineCrypt()]
|
|
* with the current [$this->]mode of operation code
|
|
*
|
|
* - create the $inline function, which called by encrypt() / decrypt()
|
|
* as its replacement to speed up the en/decryption operations.
|
|
*
|
|
* - return the name of the created $inline callback function
|
|
*
|
|
* - used to speed up en/decryption
|
|
*
|
|
*
|
|
*
|
|
* The main reason why can speed up things [up to 50%] this way are:
|
|
*
|
|
* - using variables more effective then regular.
|
|
* (ie no use of expensive arrays but integers $k_0, $k_1 ...
|
|
* or even, for example, the pure $key[] values hardcoded)
|
|
*
|
|
* - avoiding 1000's of function calls of ie _encryptBlock()
|
|
* but inlining the crypt operations.
|
|
* in the mode of operation for() loop.
|
|
*
|
|
* - full loop unroll the (sometimes key-dependent) rounds
|
|
* avoiding this way ++$i counters and runtime-if's etc...
|
|
*
|
|
* The basic code architectur of the generated $inline en/decrypt()
|
|
* lambda function, in pseudo php, is:
|
|
*
|
|
* <code>
|
|
* +----------------------------------------------------------------------------------------------+
|
|
* | callback $inline = create_function: |
|
|
* | lambda_function_0001_crypt_ECB($action, $text) |
|
|
* | { |
|
|
* | INSERT PHP CODE OF: |
|
|
* | $cipher_code['init_crypt']; // general init code. |
|
|
* | // ie: $sbox'es declarations used for |
|
|
* | // encrypt and decrypt'ing. |
|
|
* | |
|
|
* | switch ($action) { |
|
|
* | case 'encrypt': |
|
|
* | INSERT PHP CODE OF: |
|
|
* | $cipher_code['init_encrypt']; // encrypt sepcific init code. |
|
|
* | ie: specified $key or $box |
|
|
* | declarations for encrypt'ing. |
|
|
* | |
|
|
* | foreach ($ciphertext) { |
|
|
* | $in = $block_size of $ciphertext; |
|
|
* | |
|
|
* | INSERT PHP CODE OF: |
|
|
* | $cipher_code['encrypt_block']; // encrypt's (string) $in, which is always: |
|
|
* | // strlen($in) == $this->block_size |
|
|
* | // here comes the cipher algorithm in action |
|
|
* | // for encryption. |
|
|
* | // $cipher_code['encrypt_block'] has to |
|
|
* | // encrypt the content of the $in variable |
|
|
* | |
|
|
* | $plaintext .= $in; |
|
|
* | } |
|
|
* | return $plaintext; |
|
|
* | |
|
|
* | case 'decrypt': |
|
|
* | INSERT PHP CODE OF: |
|
|
* | $cipher_code['init_decrypt']; // decrypt sepcific init code |
|
|
* | ie: specified $key or $box |
|
|
* | declarations for decrypt'ing. |
|
|
* | foreach ($plaintext) { |
|
|
* | $in = $block_size of $plaintext; |
|
|
* | |
|
|
* | INSERT PHP CODE OF: |
|
|
* | $cipher_code['decrypt_block']; // decrypt's (string) $in, which is always |
|
|
* | // strlen($in) == $this->block_size |
|
|
* | // here comes the cipher algorithm in action |
|
|
* | // for decryption. |
|
|
* | // $cipher_code['decrypt_block'] has to |
|
|
* | // decrypt the content of the $in variable |
|
|
* | $ciphertext .= $in; |
|
|
* | } |
|
|
* | return $ciphertext; |
|
|
* | } |
|
|
* | } |
|
|
* +----------------------------------------------------------------------------------------------+
|
|
* </code>
|
|
*
|
|
* See also the Crypt_*::_setupInlineCrypt()'s for
|
|
* productive inline $cipher_code's how they works.
|
|
*
|
|
* Structure of:
|
|
* <code>
|
|
* $cipher_code = array(
|
|
* 'init_crypt' => (string) '', // optional
|
|
* 'init_encrypt' => (string) '', // optional
|
|
* 'init_decrypt' => (string) '', // optional
|
|
* 'encrypt_block' => (string) '', // required
|
|
* 'decrypt_block' => (string) '' // required
|
|
* );
|
|
* </code>
|
|
*
|
|
* @see Crypt_Base::_setupInlineCrypt()
|
|
* @see Crypt_Base::encrypt()
|
|
* @see Crypt_Base::decrypt()
|
|
* @param Array $cipher_code
|
|
* @access private
|
|
* @return String (the name of the created callback function)
|
|
*/
|
|
function _createInlineCryptFunction($cipher_code)
|
|
{
|
|
$block_size = $this->block_size;
|
|
|
|
// optional
|
|
$init_crypt = isset($cipher_code['init_crypt']) ? $cipher_code['init_crypt'] : '';
|
|
$init_encrypt = isset($cipher_code['init_encrypt']) ? $cipher_code['init_encrypt'] : '';
|
|
$init_decrypt = isset($cipher_code['init_decrypt']) ? $cipher_code['init_decrypt'] : '';
|
|
// required
|
|
$encrypt_block = $cipher_code['encrypt_block'];
|
|
$decrypt_block = $cipher_code['decrypt_block'];
|
|
|
|
// Generating mode of operation inline code,
|
|
// merged with the $cipher_code algorithm
|
|
// for encrypt- and decryption.
|
|
switch ($this->mode) {
|
|
case CRYPT_MODE_ECB:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
$_text = $self->_pad($_text);
|
|
$_plaintext_len = strlen($_text);
|
|
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$in = substr($_text, $_i, '.$block_size.');
|
|
'.$encrypt_block.'
|
|
$_ciphertext.= $in;
|
|
}
|
|
|
|
return $_ciphertext;
|
|
';
|
|
|
|
$decrypt = $init_decrypt . '
|
|
$_plaintext = "";
|
|
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
|
|
$_ciphertext_len = strlen($_text);
|
|
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$in = substr($_text, $_i, '.$block_size.');
|
|
'.$decrypt_block.'
|
|
$_plaintext.= $in;
|
|
}
|
|
|
|
return $self->_unpad($_plaintext);
|
|
';
|
|
break;
|
|
case CRYPT_MODE_CTR:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
$_plaintext_len = strlen($_text);
|
|
$_xor = $self->encryptIV;
|
|
$_buffer = &$self->enbuffer;
|
|
|
|
if (strlen($_buffer["encrypted"])) {
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
if (strlen($_block) > strlen($_buffer["encrypted"])) {
|
|
$in = $self->_generateXor($_xor, '.$block_size.');
|
|
'.$encrypt_block.'
|
|
$_buffer["encrypted"].= $in;
|
|
}
|
|
$_key = $self->_stringShift($_buffer["encrypted"], '.$block_size.');
|
|
$_ciphertext.= $_block ^ $_key;
|
|
}
|
|
} else {
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
$in = $self->_generateXor($_xor, '.$block_size.');
|
|
'.$encrypt_block.'
|
|
$_key = $in;
|
|
$_ciphertext.= $_block ^ $_key;
|
|
}
|
|
}
|
|
if ($self->continuousBuffer) {
|
|
$self->encryptIV = $_xor;
|
|
if ($_start = $_plaintext_len % '.$block_size.') {
|
|
$_buffer["encrypted"] = substr($_key, $_start) . $_buffer["encrypted"];
|
|
}
|
|
}
|
|
|
|
return $_ciphertext;
|
|
';
|
|
|
|
$decrypt = $init_encrypt . '
|
|
$_plaintext = "";
|
|
$_ciphertext_len = strlen($_text);
|
|
$_xor = $self->decryptIV;
|
|
$_buffer = &$self->debuffer;
|
|
|
|
if (strlen($_buffer["ciphertext"])) {
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
if (strlen($_block) > strlen($_buffer["ciphertext"])) {
|
|
$in = $self->_generateXor($_xor, '.$block_size.');
|
|
'.$encrypt_block.'
|
|
$_buffer["ciphertext"].= $in;
|
|
}
|
|
$_key = $self->_stringShift($_buffer["ciphertext"], '.$block_size.');
|
|
$_plaintext.= $_block ^ $_key;
|
|
}
|
|
} else {
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
$in = $self->_generateXor($_xor, '.$block_size.');
|
|
'.$encrypt_block.'
|
|
$_key = $in;
|
|
$_plaintext.= $_block ^ $_key;
|
|
}
|
|
}
|
|
if ($self->continuousBuffer) {
|
|
$self->decryptIV = $_xor;
|
|
if ($_start = $_ciphertext_len % '.$block_size.') {
|
|
$_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
|
|
}
|
|
}
|
|
|
|
return $_plaintext;
|
|
';
|
|
break;
|
|
case CRYPT_MODE_CFB:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
$_buffer = &$self->enbuffer;
|
|
|
|
if ($self->continuousBuffer) {
|
|
$_iv = &$self->encryptIV;
|
|
$_pos = &$_buffer["pos"];
|
|
} else {
|
|
$_iv = $self->encryptIV;
|
|
$_pos = 0;
|
|
}
|
|
$_len = strlen($_text);
|
|
$_i = 0;
|
|
if ($_pos) {
|
|
$_orig_pos = $_pos;
|
|
$_max = '.$block_size.' - $_pos;
|
|
if ($_len >= $_max) {
|
|
$_i = $_max;
|
|
$_len-= $_max;
|
|
$_pos = 0;
|
|
} else {
|
|
$_i = $_len;
|
|
$_pos+= $_len;
|
|
$_len = 0;
|
|
}
|
|
$_ciphertext = substr($_iv, $_orig_pos) ^ $_text;
|
|
$_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i);
|
|
}
|
|
while ($_len >= '.$block_size.') {
|
|
$in = $_iv;
|
|
'.$encrypt_block.';
|
|
$_iv = $in ^ substr($_text, $_i, '.$block_size.');
|
|
$_ciphertext.= $_iv;
|
|
$_len-= '.$block_size.';
|
|
$_i+= '.$block_size.';
|
|
}
|
|
if ($_len) {
|
|
$in = $_iv;
|
|
'.$encrypt_block.'
|
|
$_iv = $in;
|
|
$_block = $_iv ^ substr($_text, $_i);
|
|
$_iv = substr_replace($_iv, $_block, 0, $_len);
|
|
$_ciphertext.= $_block;
|
|
$_pos = $_len;
|
|
}
|
|
return $_ciphertext;
|
|
';
|
|
|
|
$decrypt = $init_encrypt . '
|
|
$_plaintext = "";
|
|
$_buffer = &$self->debuffer;
|
|
|
|
if ($self->continuousBuffer) {
|
|
$_iv = &$self->decryptIV;
|
|
$_pos = &$_buffer["pos"];
|
|
} else {
|
|
$_iv = $self->decryptIV;
|
|
$_pos = 0;
|
|
}
|
|
$_len = strlen($_text);
|
|
$_i = 0;
|
|
if ($_pos) {
|
|
$_orig_pos = $_pos;
|
|
$_max = '.$block_size.' - $_pos;
|
|
if ($_len >= $_max) {
|
|
$_i = $_max;
|
|
$_len-= $_max;
|
|
$_pos = 0;
|
|
} else {
|
|
$_i = $_len;
|
|
$_pos+= $_len;
|
|
$_len = 0;
|
|
}
|
|
$_plaintext = substr($_iv, $_orig_pos) ^ $_text;
|
|
$_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i);
|
|
}
|
|
while ($_len >= '.$block_size.') {
|
|
$in = $_iv;
|
|
'.$encrypt_block.'
|
|
$_iv = $in;
|
|
$cb = substr($_text, $_i, '.$block_size.');
|
|
$_plaintext.= $_iv ^ $cb;
|
|
$_iv = $cb;
|
|
$_len-= '.$block_size.';
|
|
$_i+= '.$block_size.';
|
|
}
|
|
if ($_len) {
|
|
$in = $_iv;
|
|
'.$encrypt_block.'
|
|
$_iv = $in;
|
|
$_plaintext.= $_iv ^ substr($_text, $_i);
|
|
$_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len);
|
|
$_pos = $_len;
|
|
}
|
|
|
|
return $_plaintext;
|
|
';
|
|
break;
|
|
case CRYPT_MODE_OFB:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
$_plaintext_len = strlen($_text);
|
|
$_xor = $self->encryptIV;
|
|
$_buffer = &$self->enbuffer;
|
|
|
|
if (strlen($_buffer["xor"])) {
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
if (strlen($_block) > strlen($_buffer["xor"])) {
|
|
$in = $_xor;
|
|
'.$encrypt_block.'
|
|
$_xor = $in;
|
|
$_buffer["xor"].= $_xor;
|
|
}
|
|
$_key = $self->_stringShift($_buffer["xor"], '.$block_size.');
|
|
$_ciphertext.= $_block ^ $_key;
|
|
}
|
|
} else {
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$in = $_xor;
|
|
'.$encrypt_block.'
|
|
$_xor = $in;
|
|
$_ciphertext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
|
|
}
|
|
$_key = $_xor;
|
|
}
|
|
if ($self->continuousBuffer) {
|
|
$self->encryptIV = $_xor;
|
|
if ($_start = $_plaintext_len % '.$block_size.') {
|
|
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
|
|
}
|
|
}
|
|
return $_ciphertext;
|
|
';
|
|
|
|
$decrypt = $init_encrypt . '
|
|
$_plaintext = "";
|
|
$_ciphertext_len = strlen($_text);
|
|
$_xor = $self->decryptIV;
|
|
$_buffer = &$self->debuffer;
|
|
|
|
if (strlen($_buffer["xor"])) {
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$_block = substr($_text, $_i, '.$block_size.');
|
|
if (strlen($_block) > strlen($_buffer["xor"])) {
|
|
$in = $_xor;
|
|
'.$encrypt_block.'
|
|
$_xor = $in;
|
|
$_buffer["xor"].= $_xor;
|
|
}
|
|
$_key = $self->_stringShift($_buffer["xor"], '.$block_size.');
|
|
$_plaintext.= $_block ^ $_key;
|
|
}
|
|
} else {
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$in = $_xor;
|
|
'.$encrypt_block.'
|
|
$_xor = $in;
|
|
$_plaintext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
|
|
}
|
|
$_key = $_xor;
|
|
}
|
|
if ($self->continuousBuffer) {
|
|
$self->decryptIV = $_xor;
|
|
if ($_start = $_ciphertext_len % '.$block_size.') {
|
|
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
|
|
}
|
|
}
|
|
return $_plaintext;
|
|
';
|
|
break;
|
|
case CRYPT_MODE_STREAM:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
'.$encrypt_block.'
|
|
return $_ciphertext;
|
|
';
|
|
$decrypt = $init_decrypt . '
|
|
$_plaintext = "";
|
|
'.$decrypt_block.'
|
|
return $_plaintext;
|
|
';
|
|
break;
|
|
// case CRYPT_MODE_CBC:
|
|
default:
|
|
$encrypt = $init_encrypt . '
|
|
$_ciphertext = "";
|
|
$_text = $self->_pad($_text);
|
|
$_plaintext_len = strlen($_text);
|
|
|
|
$in = $self->encryptIV;
|
|
|
|
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
|
|
$in = substr($_text, $_i, '.$block_size.') ^ $in;
|
|
'.$encrypt_block.'
|
|
$_ciphertext.= $in;
|
|
}
|
|
|
|
if ($self->continuousBuffer) {
|
|
$self->encryptIV = $in;
|
|
}
|
|
|
|
return $_ciphertext;
|
|
';
|
|
|
|
$decrypt = $init_decrypt . '
|
|
$_plaintext = "";
|
|
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
|
|
$_ciphertext_len = strlen($_text);
|
|
|
|
$_iv = $self->decryptIV;
|
|
|
|
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
|
|
$in = $_block = substr($_text, $_i, '.$block_size.');
|
|
'.$decrypt_block.'
|
|
$_plaintext.= $in ^ $_iv;
|
|
$_iv = $_block;
|
|
}
|
|
|
|
if ($self->continuousBuffer) {
|
|
$self->decryptIV = $_iv;
|
|
}
|
|
|
|
return $self->_unpad($_plaintext);
|
|
';
|
|
break;
|
|
}
|
|
|
|
// Create the $inline function and return its name as string. Ready to run!
|
|
return create_function('$_action, &$self, $_text', $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }');
|
|
}
|
|
|
|
/**
|
|
* Holds the lambda_functions table (classwide)
|
|
*
|
|
* Each name of the lambda function, created from
|
|
* _setupInlineCrypt() && _createInlineCryptFunction()
|
|
* is stored, classwide (!), here for reusing.
|
|
*
|
|
* The string-based index of $function is a classwide
|
|
* uniqe value representing, at least, the $mode of
|
|
* operation (or more... depends of the optimizing level)
|
|
* for which $mode the lambda function was created.
|
|
*
|
|
* @access private
|
|
* @return &Array
|
|
*/
|
|
function &_getLambdaFunctions()
|
|
{
|
|
static $functions = array();
|
|
return $functions;
|
|
}
|
|
}
|