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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Pure-PHP implementation of AES.
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*
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* Uses mcrypt, if available, and an internal implementation, otherwise.
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*
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* PHP versions 4 and 5
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*
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* If {@link Crypt_AES::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
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* {@link Crypt_AES::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's 136-bits
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* it'll be null-padded to 160-bits and 160 bits will be the key length until {@link Crypt_Rijndael::setKey() setKey()}
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* is called, again, at which point, it'll be recalculated.
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*
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* Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't
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* make a whole lot of sense. {@link Crypt_AES::setBlockLength() setBlockLength()}, for instance. Calling that function,
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* however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).
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*
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* Here's a short example of how to use this library:
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* <code>
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* <?php
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* include('Crypt/AES.php');
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*
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* $aes = new Crypt_AES();
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*
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* $aes->setKey('abcdefghijklmnop');
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*
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* $size = 10 * 1024;
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* $plaintext = '';
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* for ($i = 0; $i < $size; $i++) {
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* $plaintext.= 'a';
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* }
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*
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* echo $aes->decrypt($aes->encrypt($plaintext));
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* ?>
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* </code>
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*
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* LICENSE: This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* @category Crypt
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* @package Crypt_AES
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMVIII Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: AES.php,v 1.7 2010/02/09 06:10:25 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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/**
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* Include Crypt_Rijndael
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*/
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require_once 'Rijndael.php';
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/**#@+
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* @access public
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* @see Crypt_AES::encrypt()
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* @see Crypt_AES::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_AES_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_AES_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_AES_MODE_CBC', 2);
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/**#@-*/
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/**#@+
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* @access private
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* @see Crypt_AES::Crypt_AES()
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*/
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/**
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* Toggles the internal implementation
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*/
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define('CRYPT_AES_MODE_INTERNAL', 1);
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/**
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* Toggles the mcrypt implementation
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*/
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define('CRYPT_AES_MODE_MCRYPT', 2);
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/**#@-*/
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/**
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* Pure-PHP implementation of AES.
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*
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* @author Jim Wigginton <terrafrost@php.net>
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* @version 0.1.0
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* @access public
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* @package Crypt_AES
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*/
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class Crypt_AES extends Crypt_Rijndael {
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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_AES::encrypt()
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* @var String
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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_AES::decrypt()
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* @var String
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* @access private
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*/
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var $demcrypt;
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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. $mode should only, at present, be
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* CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC. If not explictly set, CRYPT_AES_MODE_CBC will be used.
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*
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* @param optional Integer $mode
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* @return Crypt_AES
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* @access public
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*/
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function Crypt_AES($mode = CRYPT_AES_MODE_CBC)
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{
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if ( !defined('CRYPT_AES_MODE') ) {
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switch (true) {
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case extension_loaded('mcrypt'):
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// i'd check to see if aes was supported, by doing in_array('des', mcrypt_list_algorithms('')),
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// but since that can be changed after the object has been created, there doesn't seem to be
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// a lot of point...
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define('CRYPT_AES_MODE', CRYPT_AES_MODE_MCRYPT);
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break;
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default:
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define('CRYPT_AES_MODE', CRYPT_AES_MODE_INTERNAL);
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}
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}
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switch ( CRYPT_AES_MODE ) {
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case CRYPT_AES_MODE_MCRYPT:
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switch ($mode) {
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case CRYPT_AES_MODE_ECB:
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$this->mode = MCRYPT_MODE_ECB;
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break;
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case CRYPT_AES_MODE_CTR:
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// ctr doesn't have a constant associated with it even though it appears to be fairly widely
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// supported. in lieu of knowing just how widely supported it is, i've, for now, opted not to
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// include a compatibility layer. the layer has been implemented but, for now, is commented out.
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$this->mode = 'ctr';
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//$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_AES_MODE_CTR;
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break;
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case CRYPT_AES_MODE_CBC:
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default:
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$this->mode = MCRYPT_MODE_CBC;
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}
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break;
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default:
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switch ($mode) {
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case CRYPT_AES_MODE_ECB:
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$this->mode = CRYPT_RIJNDAEL_MODE_ECB;
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break;
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case CRYPT_AES_MODE_CTR:
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$this->mode = CRYPT_RIJNDAEL_MODE_CTR;
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break;
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case CRYPT_AES_MODE_CBC:
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default:
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$this->mode = CRYPT_RIJNDAEL_MODE_CBC;
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}
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}
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if (CRYPT_AES_MODE == CRYPT_AES_MODE_INTERNAL) {
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parent::Crypt_Rijndael($this->mode);
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}
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}
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/**
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* Dummy function
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*
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* Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything.
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*
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* @access public
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* @param Integer $length
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*/
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function setBlockLength($length)
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{
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return;
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}
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/**
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* Encrypts a message.
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*
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* $plaintext will be padded with up to 16 additional bytes. Other AES implementations may or may not pad in the
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* same manner. Other common approaches to padding and the reasons why it's necessary are discussed in the following
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* URL:
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*
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* {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
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*
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* An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
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* strlen($plaintext) will still need to be a multiple of 16, however, arbitrary values can be added to make it that
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* length.
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*
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* @see Crypt_AES::decrypt()
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* @access public
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* @param String $plaintext
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*/
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function encrypt($plaintext)
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{
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if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
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$this->_mcryptSetup();
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/*
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if ($this->mode == CRYPT_AES_MODE_CTR) {
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$iv = $this->encryptIV;
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$xor = mcrypt_generic($this->enmcrypt, $this->_generate_xor(strlen($plaintext), $iv));
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$ciphertext = $plaintext ^ $xor;
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if ($this->continuousBuffer) {
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$this->encryptIV = $iv;
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}
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return $ciphertext;
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}
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*/
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if ($this->mode != 'ctr') {
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$plaintext = $this->_pad($plaintext);
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}
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$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
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if (!$this->continuousBuffer) {
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mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);
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}
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return $ciphertext;
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}
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return parent::encrypt($plaintext);
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}
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/**
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* Decrypts a message.
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*
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* If strlen($ciphertext) is not a multiple of 16, null bytes will be added to the end of the string until it is.
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*
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* @see Crypt_AES::encrypt()
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* @access public
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* @param String $ciphertext
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*/
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function decrypt($ciphertext)
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{
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if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
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$this->_mcryptSetup();
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/*
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if ($this->mode == CRYPT_AES_MODE_CTR) {
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$iv = $this->decryptIV;
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$xor = mcrypt_generic($this->enmcrypt, $this->_generate_xor(strlen($ciphertext), $iv));
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$plaintext = $ciphertext ^ $xor;
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if ($this->continuousBuffer) {
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$this->decryptIV = $iv;
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}
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return $plaintext;
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}
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*/
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if ($this->mode != 'ctr') {
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// we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic :
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// "The data is padded with "\0" to make sure the length of the data is n * blocksize."
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$ciphertext = str_pad($ciphertext, (strlen($ciphertext) + 15) & 0xFFFFFFF0, chr(0));
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}
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$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
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if (!$this->continuousBuffer) {
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mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
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}
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return $this->mode != 'ctr' ? $this->_unpad($plaintext) : $plaintext;
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}
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return parent::decrypt($ciphertext);
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}
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/**
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* Setup mcrypt
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*
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* Validates all the variables.
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*
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* @access private
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*/
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function _mcryptSetup()
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{
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if (!$this->changed) {
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return;
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}
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if (!$this->explicit_key_length) {
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// this just copied from Crypt_Rijndael::_setup()
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$length = strlen($this->key) >> 2;
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if ($length > 8) {
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$length = 8;
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} else if ($length < 4) {
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$length = 4;
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}
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$this->Nk = $length;
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$this->key_size = $length << 2;
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}
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switch ($this->Nk) {
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case 4: // 128
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$this->key_size = 16;
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break;
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case 5: // 160
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case 6: // 192
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$this->key_size = 24;
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break;
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case 7: // 224
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case 8: // 256
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$this->key_size = 32;
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}
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$this->key = substr($this->key, 0, $this->key_size);
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$this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($this->iv, 0, 16), 16, chr(0));
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if (!isset($this->enmcrypt)) {
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$mode = $this->mode;
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//$mode = $this->mode == CRYPT_AES_MODE_CTR ? MCRYPT_MODE_ECB : $this->mode;
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$this->demcrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
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$this->enmcrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
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} // else should mcrypt_generic_deinit be called?
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mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
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mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);
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$this->changed = false;
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}
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/**
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* Encrypts a block
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*
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* Optimized over Crypt_Rijndael's implementation by means of loop unrolling.
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*
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* @see Crypt_Rijndael::_encryptBlock()
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* @access private
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* @param String $in
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* @return String
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*/
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function _encryptBlock($in)
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{
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$state = unpack('N*word', $in);
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$Nr = $this->Nr;
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$w = $this->w;
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$t0 = $this->t0;
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$t1 = $this->t1;
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$t2 = $this->t2;
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$t3 = $this->t3;
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// addRoundKey and reindex $state
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$state = array(
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$state['word1'] ^ $w[0][0],
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$state['word2'] ^ $w[0][1],
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$state['word3'] ^ $w[0][2],
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$state['word4'] ^ $w[0][3]
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);
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// shiftRows + subWord + mixColumns + addRoundKey
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// we could loop unroll this and use if statements to do more rounds as necessary, but, in my tests, that yields
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// only a marginal improvement. since that also, imho, hinders the readability of the code, i've opted not to do it.
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for ($round = 1; $round < $this->Nr; $round++) {
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$state = array(
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$t0[$state[0] & 0xFF000000] ^ $t1[$state[1] & 0x00FF0000] ^ $t2[$state[2] & 0x0000FF00] ^ $t3[$state[3] & 0x000000FF] ^ $w[$round][0],
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$t0[$state[1] & 0xFF000000] ^ $t1[$state[2] & 0x00FF0000] ^ $t2[$state[3] & 0x0000FF00] ^ $t3[$state[0] & 0x000000FF] ^ $w[$round][1],
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$t0[$state[2] & 0xFF000000] ^ $t1[$state[3] & 0x00FF0000] ^ $t2[$state[0] & 0x0000FF00] ^ $t3[$state[1] & 0x000000FF] ^ $w[$round][2],
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$t0[$state[3] & 0xFF000000] ^ $t1[$state[0] & 0x00FF0000] ^ $t2[$state[1] & 0x0000FF00] ^ $t3[$state[2] & 0x000000FF] ^ $w[$round][3]
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);
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}
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// subWord
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$state = array(
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$this->_subWord($state[0]),
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$this->_subWord($state[1]),
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$this->_subWord($state[2]),
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$this->_subWord($state[3])
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);
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// shiftRows + addRoundKey
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$state = array(
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($state[0] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[3] & 0x000000FF) ^ $this->w[$this->Nr][0],
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($state[1] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[0] & 0x000000FF) ^ $this->w[$this->Nr][1],
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($state[2] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[1] & 0x000000FF) ^ $this->w[$this->Nr][2],
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($state[3] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[2] & 0x000000FF) ^ $this->w[$this->Nr][3]
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);
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return pack('N*', $state[0], $state[1], $state[2], $state[3]);
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}
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/**
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* Decrypts a block
|
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*
|
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* Optimized over Crypt_Rijndael's implementation by means of loop unrolling.
|
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*
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* @see Crypt_Rijndael::_decryptBlock()
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* @access private
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* @param String $in
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* @return String
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*/
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function _decryptBlock($in)
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{
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$state = unpack('N*word', $in);
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$Nr = $this->Nr;
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$dw = $this->dw;
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$dt0 = $this->dt0;
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$dt1 = $this->dt1;
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$dt2 = $this->dt2;
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$dt3 = $this->dt3;
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// addRoundKey and reindex $state
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$state = array(
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$state['word1'] ^ $dw[$this->Nr][0],
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$state['word2'] ^ $dw[$this->Nr][1],
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$state['word3'] ^ $dw[$this->Nr][2],
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$state['word4'] ^ $dw[$this->Nr][3]
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);
|
||||
|
||||
|
||||
// invShiftRows + invSubBytes + invMixColumns + addRoundKey
|
||||
for ($round = $this->Nr - 1; $round > 0; $round--) {
|
||||
$state = array(
|
||||
$dt0[$state[0] & 0xFF000000] ^ $dt1[$state[3] & 0x00FF0000] ^ $dt2[$state[2] & 0x0000FF00] ^ $dt3[$state[1] & 0x000000FF] ^ $dw[$round][0],
|
||||
$dt0[$state[1] & 0xFF000000] ^ $dt1[$state[0] & 0x00FF0000] ^ $dt2[$state[3] & 0x0000FF00] ^ $dt3[$state[2] & 0x000000FF] ^ $dw[$round][1],
|
||||
$dt0[$state[2] & 0xFF000000] ^ $dt1[$state[1] & 0x00FF0000] ^ $dt2[$state[0] & 0x0000FF00] ^ $dt3[$state[3] & 0x000000FF] ^ $dw[$round][2],
|
||||
$dt0[$state[3] & 0xFF000000] ^ $dt1[$state[2] & 0x00FF0000] ^ $dt2[$state[1] & 0x0000FF00] ^ $dt3[$state[0] & 0x000000FF] ^ $dw[$round][3]
|
||||
);
|
||||
}
|
||||
|
||||
// invShiftRows + invSubWord + addRoundKey
|
||||
$state = array(
|
||||
$this->_invSubWord(($state[0] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[1] & 0x000000FF)) ^ $dw[0][0],
|
||||
$this->_invSubWord(($state[1] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[2] & 0x000000FF)) ^ $dw[0][1],
|
||||
$this->_invSubWord(($state[2] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[3] & 0x000000FF)) ^ $dw[0][2],
|
||||
$this->_invSubWord(($state[3] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[0] & 0x000000FF)) ^ $dw[0][3]
|
||||
);
|
||||
|
||||
return pack('N*', $state[0], $state[1], $state[2], $state[3]);
|
||||
}
|
||||
}
|
||||
|
||||
// vim: ts=4:sw=4:et:
|
||||
// vim6: fdl=1:
|
||||
@ -1,945 +0,0 @@
|
||||
<?php
|
||||
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
|
||||
|
||||
/**
|
||||
* Pure-PHP implementation of DES.
|
||||
*
|
||||
* Uses mcrypt, if available, and an internal implementation, otherwise.
|
||||
*
|
||||
* PHP versions 4 and 5
|
||||
*
|
||||
* Useful resources are as follows:
|
||||
*
|
||||
* - {@link http://en.wikipedia.org/wiki/DES_supplementary_material Wikipedia: DES supplementary material}
|
||||
* - {@link http://www.itl.nist.gov/fipspubs/fip46-2.htm FIPS 46-2 - (DES), Data Encryption Standard}
|
||||
* - {@link http://www.cs.eku.edu/faculty/styer/460/Encrypt/JS-DES.html JavaScript DES Example}
|
||||
*
|
||||
* Here's a short example of how to use this library:
|
||||
* <code>
|
||||
* <?php
|
||||
* include('Crypt/DES.php');
|
||||
*
|
||||
* $des = new Crypt_DES();
|
||||
*
|
||||
* $des->setKey('abcdefgh');
|
||||
*
|
||||
* $size = 10 * 1024;
|
||||
* $plaintext = '';
|
||||
* for ($i = 0; $i < $size; $i++) {
|
||||
* $plaintext.= 'a';
|
||||
* }
|
||||
*
|
||||
* echo $des->decrypt($des->encrypt($plaintext));
|
||||
* ?>
|
||||
* </code>
|
||||
*
|
||||
* LICENSE: This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2.1 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public
|
||||
* License along with this library; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
* MA 02111-1307 USA
|
||||
*
|
||||
* @category Crypt
|
||||
* @package Crypt_DES
|
||||
* @author Jim Wigginton <terrafrost@php.net>
|
||||
* @copyright MMVII Jim Wigginton
|
||||
* @license http://www.gnu.org/licenses/lgpl.txt
|
||||
* @version $Id: DES.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $
|
||||
* @link http://phpseclib.sourceforge.net
|
||||
*/
|
||||
|
||||
/**#@+
|
||||
* @access private
|
||||
* @see Crypt_DES::_prepareKey()
|
||||
* @see Crypt_DES::_processBlock()
|
||||
*/
|
||||
/**
|
||||
* Contains array_reverse($keys[CRYPT_DES_DECRYPT])
|
||||
*/
|
||||
define('CRYPT_DES_ENCRYPT', 0);
|
||||
/**
|
||||
* Contains array_reverse($keys[CRYPT_DES_ENCRYPT])
|
||||
*/
|
||||
define('CRYPT_DES_DECRYPT', 1);
|
||||
/**#@-*/
|
||||
|
||||
/**#@+
|
||||
* @access public
|
||||
* @see Crypt_DES::encrypt()
|
||||
* @see Crypt_DES::decrypt()
|
||||
*/
|
||||
/**
|
||||
* Encrypt / decrypt using the Counter mode.
|
||||
*
|
||||
* Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
|
||||
*
|
||||
* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
|
||||
*/
|
||||
define('CRYPT_DES_MODE_CTR', -1);
|
||||
/**
|
||||
* Encrypt / decrypt using the Electronic Code Book mode.
|
||||
*
|
||||
* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
|
||||
*/
|
||||
define('CRYPT_DES_MODE_ECB', 1);
|
||||
/**
|
||||
* Encrypt / decrypt using the Code Book Chaining mode.
|
||||
*
|
||||
* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
|
||||
*/
|
||||
define('CRYPT_DES_MODE_CBC', 2);
|
||||
/**#@-*/
|
||||
|
||||
/**#@+
|
||||
* @access private
|
||||
* @see Crypt_DES::Crypt_DES()
|
||||
*/
|
||||
/**
|
||||
* Toggles the internal implementation
|
||||
*/
|
||||
define('CRYPT_DES_MODE_INTERNAL', 1);
|
||||
/**
|
||||
* Toggles the mcrypt implementation
|
||||
*/
|
||||
define('CRYPT_DES_MODE_MCRYPT', 2);
|
||||
/**#@-*/
|
||||
|
||||
/**
|
||||
* Pure-PHP implementation of DES.
|
||||
*
|
||||
* @author Jim Wigginton <terrafrost@php.net>
|
||||
* @version 0.1.0
|
||||
* @access public
|
||||
* @package Crypt_DES
|
||||
*/
|
||||
class Crypt_DES {
|
||||
/**
|
||||
* The Key Schedule
|
||||
*
|
||||
* @see Crypt_DES::setKey()
|
||||
* @var Array
|
||||
* @access private
|
||||
*/
|
||||
var $keys = "\0\0\0\0\0\0\0\0";
|
||||
|
||||
/**
|
||||
* The Encryption Mode
|
||||
*
|
||||
* @see Crypt_DES::Crypt_DES()
|
||||
* @var Integer
|
||||
* @access private
|
||||
*/
|
||||
var $mode;
|
||||
|
||||
/**
|
||||
* Continuous Buffer status
|
||||
*
|
||||
* @see Crypt_DES::enableContinuousBuffer()
|
||||
* @var Boolean
|
||||
* @access private
|
||||
*/
|
||||
var $continuousBuffer = false;
|
||||
|
||||
/**
|
||||
* Padding status
|
||||
*
|
||||
* @see Crypt_DES::enablePadding()
|
||||
* @var Boolean
|
||||
* @access private
|
||||
*/
|
||||
var $padding = true;
|
||||
|
||||
/**
|
||||
* The Initialization Vector
|
||||
*
|
||||
* @see Crypt_DES::setIV()
|
||||
* @var String
|
||||
* @access private
|
||||
*/
|
||||
var $iv = "\0\0\0\0\0\0\0\0";
|
||||
|
||||
/**
|
||||
* A "sliding" Initialization Vector
|
||||
*
|
||||
* @see Crypt_DES::enableContinuousBuffer()
|
||||
* @var String
|
||||
* @access private
|
||||
*/
|
||||
var $encryptIV = "\0\0\0\0\0\0\0\0";
|
||||
|
||||
/**
|
||||
* A "sliding" Initialization Vector
|
||||
*
|
||||
* @see Crypt_DES::enableContinuousBuffer()
|
||||
* @var String
|
||||
* @access private
|
||||
*/
|
||||
var $decryptIV = "\0\0\0\0\0\0\0\0";
|
||||
|
||||
/**
|
||||
* mcrypt resource for encryption
|
||||
*
|
||||
* The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
|
||||
* Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
|
||||
*
|
||||
* @see Crypt_AES::encrypt()
|
||||
* @var String
|
||||
* @access private
|
||||
*/
|
||||
var $enmcrypt;
|
||||
|
||||
/**
|
||||
* mcrypt resource for decryption
|
||||
*
|
||||
* The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
|
||||
* Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
|
||||
*
|
||||
* @see Crypt_AES::decrypt()
|
||||
* @var String
|
||||
* @access private
|
||||
*/
|
||||
var $demcrypt;
|
||||
|
||||
/**
|
||||
* Does the (en|de)mcrypt resource need to be (re)initialized?
|
||||
*
|
||||
* @see setKey()
|
||||
* @see setIV()
|
||||
* @var Boolean
|
||||
* @access private
|
||||
*/
|
||||
var $changed = true;
|
||||
|
||||
/**
|
||||
* Default Constructor.
|
||||
*
|
||||
* Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
|
||||
* CRYPT_DES_MODE_ECB or CRYPT_DES_MODE_CBC. If not explictly set, CRYPT_DES_MODE_CBC will be used.
|
||||
*
|
||||
* @param optional Integer $mode
|
||||
* @return Crypt_DES
|
||||
* @access public
|
||||
*/
|
||||
function Crypt_DES($mode = CRYPT_MODE_DES_CBC)
|
||||
{
|
||||
if ( !defined('CRYPT_DES_MODE') ) {
|
||||
switch (true) {
|
||||
case extension_loaded('mcrypt'):
|
||||
// i'd check to see if des was supported, by doing in_array('des', mcrypt_list_algorithms('')),
|
||||
// but since that can be changed after the object has been created, there doesn't seem to be
|
||||
// a lot of point...
|
||||
define('CRYPT_DES_MODE', CRYPT_DES_MODE_MCRYPT);
|
||||
break;
|
||||
default:
|
||||
define('CRYPT_DES_MODE', CRYPT_DES_MODE_INTERNAL);
|
||||
}
|
||||
}
|
||||
|
||||
switch ( CRYPT_DES_MODE ) {
|
||||
case CRYPT_DES_MODE_MCRYPT:
|
||||
switch ($mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
$this->mode = MCRYPT_MODE_ECB;
|
||||
break;
|
||||
case CRYPT_DES_MODE_CTR:
|
||||
$this->mode = 'ctr';
|
||||
//$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_DES_MODE_CTR;
|
||||
break;
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
default:
|
||||
$this->mode = MCRYPT_MODE_CBC;
|
||||
}
|
||||
|
||||
break;
|
||||
default:
|
||||
switch ($mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
case CRYPT_DES_MODE_CTR:
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
$this->mode = $mode;
|
||||
break;
|
||||
default:
|
||||
$this->mode = CRYPT_DES_MODE_CBC;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the key.
|
||||
*
|
||||
* Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we
|
||||
* only use the first eight, if $key has more then eight characters in it, and pad $key with the
|
||||
* null byte if it is less then eight characters long.
|
||||
*
|
||||
* DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
|
||||
*
|
||||
* If the key is not explicitly set, it'll be assumed to be all zero's.
|
||||
*
|
||||
* @access public
|
||||
* @param String $key
|
||||
*/
|
||||
function setKey($key)
|
||||
{
|
||||
$this->keys = ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) ? substr($key, 0, 8) : $this->_prepareKey($key);
|
||||
$this->changed = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the initialization vector. (optional)
|
||||
*
|
||||
* SetIV is not required when CRYPT_DES_MODE_ECB is being used. If not explictly set, it'll be assumed
|
||||
* to be all zero's.
|
||||
*
|
||||
* @access public
|
||||
* @param String $iv
|
||||
*/
|
||||
function setIV($iv)
|
||||
{
|
||||
$this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($iv, 0, 8), 8, chr(0));
|
||||
$this->changed = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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_DES::decrypt()
|
||||
* @see Crypt_DES::encrypt()
|
||||
* @access public
|
||||
* @param Integer $length
|
||||
* @param String $iv
|
||||
*/
|
||||
function _generate_xor($length, &$iv)
|
||||
{
|
||||
$xor = '';
|
||||
$num_blocks = ($length + 7) >> 3;
|
||||
for ($i = 0; $i < $num_blocks; $i++) {
|
||||
$xor.= $iv;
|
||||
for ($j = 4; $j <= 8; $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;
|
||||
}
|
||||
|
||||
/**
|
||||
* Encrypts a message.
|
||||
*
|
||||
* $plaintext will be padded with up to 8 additional bytes. Other DES implementations may or may not pad in the
|
||||
* same manner. Other common approaches to padding and the reasons why it's necessary are discussed in the following
|
||||
* URL:
|
||||
*
|
||||
* {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
|
||||
*
|
||||
* An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
|
||||
* strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that
|
||||
* length.
|
||||
*
|
||||
* @see Crypt_DES::decrypt()
|
||||
* @access public
|
||||
* @param String $plaintext
|
||||
*/
|
||||
function encrypt($plaintext)
|
||||
{
|
||||
if ($this->mode != CRYPT_DES_MODE_CTR && $this->mode != 'ctr') {
|
||||
$plaintext = $this->_pad($plaintext);
|
||||
}
|
||||
|
||||
if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) {
|
||||
if ($this->changed) {
|
||||
if (!isset($this->enmcrypt)) {
|
||||
$this->enmcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, '');
|
||||
}
|
||||
mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
|
||||
$this->changed = false;
|
||||
}
|
||||
|
||||
$ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
|
||||
|
||||
if (!$this->continuousBuffer) {
|
||||
mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
|
||||
}
|
||||
|
||||
return $ciphertext;
|
||||
}
|
||||
|
||||
if (!is_array($this->keys)) {
|
||||
$this->keys = $this->_prepareKey("\0\0\0\0\0\0\0\0");
|
||||
}
|
||||
|
||||
$ciphertext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
for ($i = 0; $i < strlen($plaintext); $i+=8) {
|
||||
$ciphertext.= $this->_processBlock(substr($plaintext, $i, 8), CRYPT_DES_ENCRYPT);
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
$xor = $this->encryptIV;
|
||||
for ($i = 0; $i < strlen($plaintext); $i+=8) {
|
||||
$block = substr($plaintext, $i, 8);
|
||||
$block = $this->_processBlock($block ^ $xor, CRYPT_DES_ENCRYPT);
|
||||
$xor = $block;
|
||||
$ciphertext.= $block;
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->encryptIV = $xor;
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CTR:
|
||||
$xor = $this->encryptIV;
|
||||
for ($i = 0; $i < strlen($plaintext); $i+=8) {
|
||||
$block = substr($plaintext, $i, 8);
|
||||
$key = $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT);
|
||||
$ciphertext.= $block ^ $key;
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->encryptIV = $xor;
|
||||
}
|
||||
}
|
||||
|
||||
return $ciphertext;
|
||||
}
|
||||
|
||||
/**
|
||||
* Decrypts a message.
|
||||
*
|
||||
* If strlen($ciphertext) is not a multiple of 8, null bytes will be added to the end of the string until it is.
|
||||
*
|
||||
* @see Crypt_DES::encrypt()
|
||||
* @access public
|
||||
* @param String $ciphertext
|
||||
*/
|
||||
function decrypt($ciphertext)
|
||||
{
|
||||
if ($this->mode != CRYPT_DES_MODE_CTR && $this->mode != 'ctr') {
|
||||
// we pad with chr(0) since that's what mcrypt_generic does. to quote from http://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($ciphertext) + 7) & 0xFFFFFFF8, chr(0));
|
||||
}
|
||||
|
||||
if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) {
|
||||
if ($this->changed) {
|
||||
if (!isset($this->demcrypt)) {
|
||||
$this->demcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, '');
|
||||
}
|
||||
mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
|
||||
$this->changed = false;
|
||||
}
|
||||
|
||||
$plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
|
||||
|
||||
if (!$this->continuousBuffer) {
|
||||
mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
|
||||
}
|
||||
|
||||
return $this->mode != 'ctr' ? $this->_unpad($plaintext) : $plaintext;
|
||||
}
|
||||
|
||||
if (!is_array($this->keys)) {
|
||||
$this->keys = $this->_prepareKey("\0\0\0\0\0\0\0\0");
|
||||
}
|
||||
|
||||
$plaintext = '';
|
||||
switch ($this->mode) {
|
||||
case CRYPT_DES_MODE_ECB:
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=8) {
|
||||
$plaintext.= $this->_processBlock(substr($ciphertext, $i, 8), CRYPT_DES_DECRYPT);
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CBC:
|
||||
$xor = $this->decryptIV;
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
$plaintext.= $this->_processBlock($block, CRYPT_DES_DECRYPT) ^ $xor;
|
||||
$xor = $block;
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $xor;
|
||||
}
|
||||
break;
|
||||
case CRYPT_DES_MODE_CTR:
|
||||
$xor = $this->decryptIV;
|
||||
for ($i = 0; $i < strlen($ciphertext); $i+=8) {
|
||||
$block = substr($ciphertext, $i, 8);
|
||||
$key = $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT);
|
||||
$plaintext.= $block ^ $key;
|
||||
}
|
||||
if ($this->continuousBuffer) {
|
||||
$this->decryptIV = $xor;
|
||||
}
|
||||
}
|
||||
|
||||
return $this->mode != CRYPT_DES_MODE_CTR ? $this->_unpad($plaintext) : $plaintext;
|
||||
}
|
||||
|
||||
/**
|
||||
* Treat consecutive "packets" as if they are a continuous buffer.
|
||||
*
|
||||
* Say you have a 16-byte plaintext $plaintext. Using the default behavior, the two following code snippets
|
||||
* will yield different outputs:
|
||||
*
|
||||
* <code>
|
||||
* echo $des->encrypt(substr($plaintext, 0, 8));
|
||||
* echo $des->encrypt(substr($plaintext, 8, 8));
|
||||
* </code>
|
||||
* <code>
|
||||
* echo $des->encrypt($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>
|
||||
* $des->encrypt(substr($plaintext, 0, 8));
|
||||
* echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
|
||||
* </code>
|
||||
* <code>
|
||||
* echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
|
||||
* </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_DES() object changes after each
|
||||
* encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that
|
||||
* continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them),
|
||||
* however, they are also less intuitive and more likely to cause you problems.
|
||||
*
|
||||
* @see Crypt_DES::disableContinuousBuffer()
|
||||
* @access public
|
||||
*/
|
||||
function enableContinuousBuffer()
|
||||
{
|
||||
$this->continuousBuffer = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Treat consecutive packets as if they are a discontinuous buffer.
|
||||
*
|
||||
* The default behavior.
|
||||
*
|
||||
* @see Crypt_DES::enableContinuousBuffer()
|
||||
* @access public
|
||||
*/
|
||||
function disableContinuousBuffer()
|
||||
{
|
||||
$this->continuousBuffer = false;
|
||||
$this->encryptIV = $this->iv;
|
||||
$this->decryptIV = $this->iv;
|
||||
}
|
||||
|
||||
/**
|
||||
* Pad "packets".
|
||||
*
|
||||
* DES works by encrypting eight bytes at a time. If you ever need to encrypt or decrypt something that's not
|
||||
* a multiple of eight, it becomes necessary to pad the input so that it's length is a multiple of eight.
|
||||
*
|
||||
* Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH1,
|
||||
* 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_DES::disablePadding()
|
||||
* @access public
|
||||
*/
|
||||
function enablePadding()
|
||||
{
|
||||
$this->padding = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Do not pad packets.
|
||||
*
|
||||
* @see Crypt_DES::enablePadding()
|
||||
* @access public
|
||||
*/
|
||||
function disablePadding()
|
||||
{
|
||||
$this->padding = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Pads a string
|
||||
*
|
||||
* Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize (8).
|
||||
* 8 - (strlen($text) & 7) bytes are added, each of which is equal to chr(8 - (strlen($text) & 7)
|
||||
*
|
||||
* If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
|
||||
* and padding will, hence forth, be enabled.
|
||||
*
|
||||
* @see Crypt_DES::_unpad()
|
||||
* @access private
|
||||
*/
|
||||
function _pad($text)
|
||||
{
|
||||
$length = strlen($text);
|
||||
|
||||
if (!$this->padding) {
|
||||
if (($length & 7) == 0) {
|
||||
return $text;
|
||||
} else {
|
||||
user_error("The plaintext's length ($length) is not a multiple of the block size (8)", E_USER_NOTICE);
|
||||
$this->padding = true;
|
||||
}
|
||||
}
|
||||
|
||||
$pad = 8 - ($length & 7);
|
||||
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_DES::_pad()
|
||||
* @access private
|
||||
*/
|
||||
function _unpad($text)
|
||||
{
|
||||
if (!$this->padding) {
|
||||
return $text;
|
||||
}
|
||||
|
||||
$length = ord($text[strlen($text) - 1]);
|
||||
|
||||
if (!$length || $length > 8) {
|
||||
return false;
|
||||
}
|
||||
|
||||
return substr($text, 0, -$length);
|
||||
}
|
||||
|
||||
/**
|
||||
* Encrypts or decrypts a 64-bit block
|
||||
*
|
||||
* $mode should be either CRYPT_DES_ENCRYPT or CRYPT_DES_DECRYPT. See
|
||||
* {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general
|
||||
* idea of what this function does.
|
||||
*
|
||||
* @access private
|
||||
* @param String $block
|
||||
* @param Integer $mode
|
||||
* @return String
|
||||
*/
|
||||
function _processBlock($block, $mode)
|
||||
{
|
||||
// s-boxes. in the official DES docs, they're described as being matrices that
|
||||
// one accesses by using the first and last bits to determine the row and the
|
||||
// middle four bits to determine the column. in this implementation, they've
|
||||
// been converted to vectors
|
||||
static $sbox = array(
|
||||
array(
|
||||
14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
|
||||
3, 10 ,10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
|
||||
4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
|
||||
15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
|
||||
),
|
||||
array(
|
||||
15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
|
||||
9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
|
||||
0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
|
||||
5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
|
||||
),
|
||||
array(
|
||||
10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
|
||||
1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
|
||||
13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
|
||||
11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
|
||||
),
|
||||
array(
|
||||
7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
|
||||
1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
|
||||
10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
|
||||
15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
|
||||
),
|
||||
array(
|
||||
2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
|
||||
8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
|
||||
4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
|
||||
15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
|
||||
),
|
||||
array(
|
||||
12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
|
||||
0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
|
||||
9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
|
||||
7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
|
||||
),
|
||||
array(
|
||||
4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
|
||||
3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
|
||||
1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
|
||||
10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
|
||||
),
|
||||
array(
|
||||
13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
|
||||
10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
|
||||
7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
|
||||
0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
|
||||
)
|
||||
);
|
||||
|
||||
$keys = $this->keys;
|
||||
|
||||
$temp = unpack('Na/Nb', $block);
|
||||
$block = array($temp['a'], $temp['b']);
|
||||
|
||||
// because php does arithmetic right shifts, if the most significant bits are set, right
|
||||
// shifting those into the correct position will add 1's - not 0's. this will intefere
|
||||
// with the | operation unless a second & is done. so we isolate these bits and left shift
|
||||
// them into place. we then & each block with 0x7FFFFFFF to prevennt 1's from being added
|
||||
// for any other shifts.
|
||||
$msb = array(
|
||||
($block[0] >> 31) & 1,
|
||||
($block[1] >> 31) & 1
|
||||
);
|
||||
$block[0] &= 0x7FFFFFFF;
|
||||
$block[1] &= 0x7FFFFFFF;
|
||||
|
||||
// we isolate the appropriate bit in the appropriate integer and shift as appropriate. in
|
||||
// some cases, there are going to be multiple bits in the same integer that need to be shifted
|
||||
// in the same way. we combine those into one shift operation.
|
||||
$block = array(
|
||||
(($block[1] & 0x00000040) << 25) | (($block[1] & 0x00004000) << 16) |
|
||||
(($block[1] & 0x00400001) << 7) | (($block[1] & 0x40000100) >> 2) |
|
||||
(($block[0] & 0x00000040) << 21) | (($block[0] & 0x00004000) << 12) |
|
||||
(($block[0] & 0x00400001) << 3) | (($block[0] & 0x40000100) >> 6) |
|
||||
(($block[1] & 0x00000010) << 19) | (($block[1] & 0x00001000) << 10) |
|
||||
(($block[1] & 0x00100000) << 1) | (($block[1] & 0x10000000) >> 8) |
|
||||
(($block[0] & 0x00000010) << 15) | (($block[0] & 0x00001000) << 6) |
|
||||
(($block[0] & 0x00100000) >> 3) | (($block[0] & 0x10000000) >> 12) |
|
||||
(($block[1] & 0x00000004) << 13) | (($block[1] & 0x00000400) << 4) |
|
||||
(($block[1] & 0x00040000) >> 5) | (($block[1] & 0x04000000) >> 14) |
|
||||
(($block[0] & 0x00000004) << 9) | ( $block[0] & 0x00000400 ) |
|
||||
(($block[0] & 0x00040000) >> 9) | (($block[0] & 0x04000000) >> 18) |
|
||||
(($block[1] & 0x00010000) >> 11) | (($block[1] & 0x01000000) >> 20) |
|
||||
(($block[0] & 0x00010000) >> 15) | (($block[0] & 0x01000000) >> 24)
|
||||
,
|
||||
(($block[1] & 0x00000080) << 24) | (($block[1] & 0x00008000) << 15) |
|
||||
(($block[1] & 0x00800002) << 6) | (($block[0] & 0x00000080) << 20) |
|
||||
(($block[0] & 0x00008000) << 11) | (($block[0] & 0x00800002) << 2) |
|
||||
(($block[1] & 0x00000020) << 18) | (($block[1] & 0x00002000) << 9) |
|
||||
( $block[1] & 0x00200000 ) | (($block[1] & 0x20000000) >> 9) |
|
||||
(($block[0] & 0x00000020) << 14) | (($block[0] & 0x00002000) << 5) |
|
||||
(($block[0] & 0x00200000) >> 4) | (($block[0] & 0x20000000) >> 13) |
|
||||
(($block[1] & 0x00000008) << 12) | (($block[1] & 0x00000800) << 3) |
|
||||
(($block[1] & 0x00080000) >> 6) | (($block[1] & 0x08000000) >> 15) |
|
||||
(($block[0] & 0x00000008) << 8) | (($block[0] & 0x00000800) >> 1) |
|
||||
(($block[0] & 0x00080000) >> 10) | (($block[0] & 0x08000000) >> 19) |
|
||||
(($block[1] & 0x00000200) >> 3) | (($block[0] & 0x00000200) >> 7) |
|
||||
(($block[1] & 0x00020000) >> 12) | (($block[1] & 0x02000000) >> 21) |
|
||||
(($block[0] & 0x00020000) >> 16) | (($block[0] & 0x02000000) >> 25) |
|
||||
($msb[1] << 28) | ($msb[0] << 24)
|
||||
);
|
||||
|
||||
for ($i = 0; $i < 16; $i++) {
|
||||
// start of "the Feistel (F) function" - see the following URL:
|
||||
// http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
|
||||
$temp = (($sbox[0][((($block[1] >> 27) & 0x1F) | (($block[1] & 1) << 5)) ^ $keys[$mode][$i][0]]) << 28)
|
||||
| (($sbox[1][(($block[1] & 0x1F800000) >> 23) ^ $keys[$mode][$i][1]]) << 24)
|
||||
| (($sbox[2][(($block[1] & 0x01F80000) >> 19) ^ $keys[$mode][$i][2]]) << 20)
|
||||
| (($sbox[3][(($block[1] & 0x001F8000) >> 15) ^ $keys[$mode][$i][3]]) << 16)
|
||||
| (($sbox[4][(($block[1] & 0x0001F800) >> 11) ^ $keys[$mode][$i][4]]) << 12)
|
||||
| (($sbox[5][(($block[1] & 0x00001F80) >> 7) ^ $keys[$mode][$i][5]]) << 8)
|
||||
| (($sbox[6][(($block[1] & 0x000001F8) >> 3) ^ $keys[$mode][$i][6]]) << 4)
|
||||
| ( $sbox[7][((($block[1] & 0x1F) << 1) | (($block[1] >> 31) & 1)) ^ $keys[$mode][$i][7]]);
|
||||
|
||||
$msb = ($temp >> 31) & 1;
|
||||
$temp &= 0x7FFFFFFF;
|
||||
$newBlock = (($temp & 0x00010000) << 15) | (($temp & 0x02020120) << 5)
|
||||
| (($temp & 0x00001800) << 17) | (($temp & 0x01000000) >> 10)
|
||||
| (($temp & 0x00000008) << 24) | (($temp & 0x00100000) << 6)
|
||||
| (($temp & 0x00000010) << 21) | (($temp & 0x00008000) << 9)
|
||||
| (($temp & 0x00000200) << 12) | (($temp & 0x10000000) >> 27)
|
||||