Modified: vcl/trunk/web/.ht-inc/phpseclib/Crypt/DES.php URL: http://svn.apache.org/viewvc/vcl/trunk/web/.ht-inc/phpseclib/Crypt/DES.php?rev=1796097&r1=1796096&r2=1796097&view=diff ============================================================================== --- vcl/trunk/web/.ht-inc/phpseclib/Crypt/DES.php (original) +++ vcl/trunk/web/.ht-inc/phpseclib/Crypt/DES.php Wed May 24 20:28:10 2017 @@ -1,1245 +1,1516 @@ -<?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: Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - * - * @category Crypt - * @package Crypt_DES - * @author Jim Wigginton <[email protected]> - * @copyright MMVII Jim Wigginton - * @license http://www.opensource.org/licenses/mit-license.html MIT License - * @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); -/** - * Encrypt / decrypt using the Cipher Feedback mode. - * - * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29 - */ -define('CRYPT_DES_MODE_CFB', 3); -/** - * Encrypt / decrypt using the Cipher Feedback mode. - * - * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29 - */ -define('CRYPT_DES_MODE_OFB', 4); -/**#@-*/ - -/**#@+ - * @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 <[email protected]> - * @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_DES::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_DES::decrypt() - * @var String - * @access private - */ - var $demcrypt; - - /** - * Does the enmcrypt resource need to be (re)initialized? - * - * @see Crypt_DES::setKey() - * @see Crypt_DES::setIV() - * @var Boolean - * @access private - */ - var $enchanged = true; - - /** - * Does the demcrypt resource need to be (re)initialized? - * - * @see Crypt_DES::setKey() - * @see Crypt_DES::setIV() - * @var Boolean - * @access private - */ - var $dechanged = true; - - /** - * Is the mode one that is paddable? - * - * @see Crypt_DES::Crypt_DES() - * @var Boolean - * @access private - */ - var $paddable = false; - - /** - * Encryption buffer for CTR, OFB and CFB modes - * - * @see Crypt_DES::encrypt() - * @var String - * @access private - */ - var $enbuffer = ''; - - /** - * Decryption buffer for CTR, OFB and CFB modes - * - * @see Crypt_DES::decrypt() - * @var String - * @access private - */ - var $debuffer = ''; - - /** - * mcrypt resource for CFB mode - * - * @see Crypt_DES::encrypt() - * @see Crypt_DES::decrypt() - * @var String - * @access private - */ - var $ecb; - - /** - * 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->paddable = true; - $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_CFB: - $this->mode = 'ncfb'; - break; - case CRYPT_DES_MODE_OFB: - $this->mode = MCRYPT_MODE_NOFB; - break; - case CRYPT_DES_MODE_CBC: - default: - $this->paddable = true; - $this->mode = MCRYPT_MODE_CBC; - } - - break; - default: - switch ($mode) { - case CRYPT_DES_MODE_ECB: - case CRYPT_DES_MODE_CBC: - $this->paddable = true; - $this->mode = $mode; - break; - case CRYPT_DES_MODE_CTR: - case CRYPT_DES_MODE_CFB: - case CRYPT_DES_MODE_OFB: - $this->mode = $mode; - break; - default: - $this->paddable = true; - $this->mode = CRYPT_DES_MODE_CBC; - } - } - } - - /** - * Sets the key. - * - * Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($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) - { - $this->keys = ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) ? str_pad(substr($key, 0, 8), 8, chr(0)) : $this->_prepareKey($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->paddable) { - $plaintext = $this->_pad($plaintext); - } - - if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) { - if ($this->enchanged) { - if (!isset($this->enmcrypt)) { - $this->enmcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, ''); - } - mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV); - if ($this->mode != 'ncfb') { - $this->enchanged = false; - } - } - - if ($this->mode != 'ncfb') { - $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext); - } else { - if ($this->enchanged) { - $this->ecb = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, ''); - mcrypt_generic_init($this->ecb, $this->keys, "\0\0\0\0\0\0\0\0"); - $this->enchanged = false; - } - - if (strlen($this->enbuffer)) { - $ciphertext = $plaintext ^ substr($this->encryptIV, strlen($this->enbuffer)); - $this->enbuffer.= $ciphertext; - if (strlen($this->enbuffer) == 8) { - $this->encryptIV = $this->enbuffer; - $this->enbuffer = ''; - mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV); - } - $plaintext = substr($plaintext, strlen($ciphertext)); - } else { - $ciphertext = ''; - } - - $last_pos = strlen($plaintext) & 0xFFFFFFF8; - $ciphertext.= $last_pos ? mcrypt_generic($this->enmcrypt, substr($plaintext, 0, $last_pos)) : ''; - - if (strlen($plaintext) & 0x7) { - if (strlen($ciphertext)) { - $this->encryptIV = substr($ciphertext, -8); - } - $this->encryptIV = mcrypt_generic($this->ecb, $this->encryptIV); - $this->enbuffer = substr($plaintext, $last_pos) ^ $this->encryptIV; - $ciphertext.= $this->enbuffer; - } - } - - if (!$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"); - } - - $buffer = &$this->enbuffer; - $continuousBuffer = $this->continuousBuffer; - $ciphertext = ''; - switch ($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 = $this->encryptIV; - if (strlen($buffer)) { - for ($i = 0; $i < strlen($plaintext); $i+=8) { - $block = substr($plaintext, $i, 8); - $buffer.= $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT); - $key = $this->_string_shift($buffer, 8); - $ciphertext.= $block ^ $key; - } - } else { - for ($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 = $xor; - if ($start = strlen($plaintext) & 7) { - $buffer = substr($key, $start) . $buffer; - } - } - break; - case CRYPT_DES_MODE_CFB: - if (!empty($buffer['xor'])) { - $ciphertext = $plaintext ^ $buffer['xor']; - $iv = $buffer['encrypted'] . $ciphertext; - $start = strlen($ciphertext); - $buffer['encrypted'].= $ciphertext; - $buffer['xor'] = substr($buffer['xor'], strlen($ciphertext)); - } else { - $ciphertext = ''; - $iv = $this->encryptIV; - $start = 0; - } - - for ($i = $start; $i < strlen($plaintext); $i+=8) { - $block = substr($plaintext, $i, 8); - $xor = $this->_processBlock($iv, CRYPT_DES_ENCRYPT); - $iv = $block ^ $xor; - if ($continuousBuffer && strlen($iv) != 8) { - $buffer = array( - 'encrypted' => $iv, - 'xor' => substr($xor, strlen($iv)) - ); - } - $ciphertext.= $iv; - } - - if ($this->continuousBuffer) { - $this->encryptIV = $iv; - } - break; - case CRYPT_DES_MODE_OFB: - $xor = $this->encryptIV; - if (strlen($buffer)) { - for ($i = 0; $i < strlen($plaintext); $i+=8) { - $xor = $this->_processBlock($xor, CRYPT_DES_ENCRYPT); - $buffer.= $xor; - $key = $this->_string_shift($buffer, 8); - $ciphertext.= substr($plaintext, $i, 8) ^ $key; - } - } else { - for ($i = 0; $i < strlen($plaintext); $i+=8) { - $xor = $this->_processBlock($xor, CRYPT_DES_ENCRYPT); - $ciphertext.= substr($plaintext, $i, 8) ^ $xor; - } - $key = $xor; - } - if ($this->continuousBuffer) { - $this->encryptIV = $xor; - if ($start = strlen($plaintext) & 7) { - $buffer = substr($key, $start) . $buffer; - } - } - } - - 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->paddable) { - // 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->dechanged) { - if (!isset($this->demcrypt)) { - $this->demcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, ''); - } - mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV); - if ($this->mode != 'ncfb') { - $this->dechanged = false; - } - } - - if ($this->mode != 'ncfb') { - $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext); - } else { - if ($this->dechanged) { - $this->ecb = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_ECB, ''); - mcrypt_generic_init($this->ecb, $this->keys, "\0\0\0\0\0\0\0\0"); - $this->dechanged = false; - } - - if (strlen($this->debuffer)) { - $plaintext = $ciphertext ^ substr($this->decryptIV, strlen($this->debuffer)); - - $this->debuffer.= substr($ciphertext, 0, strlen($plaintext)); - if (strlen($this->debuffer) == 8) { - $this->decryptIV = $this->debuffer; - $this->debuffer = ''; - mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV); - } - $ciphertext = substr($ciphertext, strlen($plaintext)); - } else { - $plaintext = ''; - } - - $last_pos = strlen($ciphertext) & 0xFFFFFFF8; - $plaintext.= $last_pos ? mdecrypt_generic($this->demcrypt, substr($ciphertext, 0, $last_pos)) : ''; - - if (strlen($ciphertext) & 0x7) { - if (strlen($plaintext)) { - $this->decryptIV = substr($ciphertext, $last_pos - 8, 8); - } - $this->decryptIV = mcrypt_generic($this->ecb, $this->decryptIV); - $this->debuffer = substr($ciphertext, $last_pos); - $plaintext.= $this->debuffer ^ $this->decryptIV; - } - - return $plaintext; - } - - if (!$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"); - } - - $buffer = &$this->debuffer; - $continuousBuffer = $this->continuousBuffer; - $plaintext = ''; - switch ($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 = $this->decryptIV; - if (strlen($buffer)) { - for ($i = 0; $i < strlen($ciphertext); $i+=8) { - $block = substr($ciphertext, $i, 8); - $buffer.= $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT); - $key = $this->_string_shift($buffer, 8); - $plaintext.= $block ^ $key; - } - } else { - for ($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 = $xor; - if ($start = strlen($ciphertext) % 8) { - $buffer = substr($key, $start) . $buffer; - } - } - break; - case CRYPT_DES_MODE_CFB: - if (!empty($buffer['ciphertext'])) { - $plaintext = $ciphertext ^ substr($this->decryptIV, strlen($buffer['ciphertext'])); - $buffer['ciphertext'].= substr($ciphertext, 0, strlen($plaintext)); - if (strlen($buffer['ciphertext']) == 8) { - $xor = $this->_processBlock($buffer['ciphertext'], CRYPT_DES_ENCRYPT); - $buffer['ciphertext'] = ''; - } - $start = strlen($plaintext); - $block = $this->decryptIV; - } else { - $plaintext = ''; - $xor = $this->_processBlock($this->decryptIV, CRYPT_DES_ENCRYPT); - $start = 0; - } - - for ($i = $start; $i < strlen($ciphertext); $i+=8) { - $block = substr($ciphertext, $i, 8); - $plaintext.= $block ^ $xor; - if ($continuousBuffer && strlen($block) != 8) { - $buffer['ciphertext'].= $block; - $block = $xor; - } else if (strlen($block) == 8) { - $xor = $this->_processBlock($block, CRYPT_DES_ENCRYPT); - } - } - if ($this->continuousBuffer) { - $this->decryptIV = $block; - } - break; - case CRYPT_DES_MODE_OFB: - $xor = $this->decryptIV; - if (strlen($buffer)) { - for ($i = 0; $i < strlen($ciphertext); $i+=8) { - $xor = $this->_processBlock($xor, CRYPT_DES_ENCRYPT); - $buffer.= $xor; - $key = $this->_string_shift($buffer, 8); - $plaintext.= substr($ciphertext, $i, 8) ^ $key; - } - } else { - for ($i = 0; $i < strlen($ciphertext); $i+=8) { - $xor = $this->_processBlock($xor, CRYPT_DES_ENCRYPT); - $plaintext.= substr($ciphertext, $i, 8) ^ $xor; - } - $key = $xor; - } - if ($this->continuousBuffer) { - $this->decryptIV = $xor; - if ($start = strlen($ciphertext) % 8) { - $buffer = substr($key, $start) . $buffer; - } - } - } - - return $this->paddable ? $this->_unpad($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) | (($temp & 0x10000000) >> 27) - | (($temp & 0x00000040) << 14) | (($temp & 0x08000000) >> 8) - | (($temp & 0x00004000) << 4) | (($temp & 0x00000002) << 16) - | (($temp & 0x00442000) >> 6) | (($temp & 0x40800000) >> 15) - | (($temp & 0x00000001) << 11) | (($temp & 0x20000000) >> 20) - | (($temp & 0x00080000) >> 13) | (($temp & 0x00000004) << 3) - | (($temp & 0x04000000) >> 22) | (($temp & 0x00000480) >> 7) - | (($temp & 0x00200000) >> 19) | ($msb << 23); - // end of "the Feistel (F) function" - $newBlock is F's output - - $temp = $block[1]; - $block[1] = $block[0] ^ $newBlock; - $block[0] = $temp; - } - - $msb = array( - ($block[0] >> 31) & 1, - ($block[1] >> 31) & 1 - ); - $block[0] &= 0x7FFFFFFF; - $block[1] &= 0x7FFFFFFF; - - $block = array( - (($block[0] & 0x01000004) << 7) | (($block[1] & 0x01000004) << 6) | - (($block[0] & 0x00010000) << 13) | (($block[1] & 0x00010000) << 12) | - (($block[0] & 0x00000100) << 19) | (($block[1] & 0x00000100) << 18) | - (($block[0] & 0x00000001) << 25) | (($block[1] & 0x00000001) << 24) | - (($block[0] & 0x02000008) >> 2) | (($block[1] & 0x02000008) >> 3) | - (($block[0] & 0x00020000) << 4) | (($block[1] & 0x00020000) << 3) | - (($block[0] & 0x00000200) << 10) | (($block[1] & 0x00000200) << 9) | - (($block[0] & 0x00000002) << 16) | (($block[1] & 0x00000002) << 15) | - (($block[0] & 0x04000000) >> 11) | (($block[1] & 0x04000000) >> 12) | - (($block[0] & 0x00040000) >> 5) | (($block[1] & 0x00040000) >> 6) | - (($block[0] & 0x00000400) << 1) | ( $block[1] & 0x00000400 ) | - (($block[0] & 0x08000000) >> 20) | (($block[1] & 0x08000000) >> 21) | - (($block[0] & 0x00080000) >> 14) | (($block[1] & 0x00080000) >> 15) | - (($block[0] & 0x00000800) >> 8) | (($block[1] & 0x00000800) >> 9) - , - (($block[0] & 0x10000040) << 3) | (($block[1] & 0x10000040) << 2) | - (($block[0] & 0x00100000) << 9) | (($block[1] & 0x00100000) << 8) | - (($block[0] & 0x00001000) << 15) | (($block[1] & 0x00001000) << 14) | - (($block[0] & 0x00000010) << 21) | (($block[1] & 0x00000010) << 20) | - (($block[0] & 0x20000080) >> 6) | (($block[1] & 0x20000080) >> 7) | - ( $block[0] & 0x00200000 ) | (($block[1] & 0x00200000) >> 1) | - (($block[0] & 0x00002000) << 6) | (($block[1] & 0x00002000) << 5) | - (($block[0] & 0x00000020) << 12) | (($block[1] & 0x00000020) << 11) | - (($block[0] & 0x40000000) >> 15) | (($block[1] & 0x40000000) >> 16) | - (($block[0] & 0x00400000) >> 9) | (($block[1] & 0x00400000) >> 10) | - (($block[0] & 0x00004000) >> 3) | (($block[1] & 0x00004000) >> 4) | - (($block[0] & 0x00800000) >> 18) | (($block[1] & 0x00800000) >> 19) | - (($block[0] & 0x00008000) >> 12) | (($block[1] & 0x00008000) >> 13) | - ($msb[0] << 7) | ($msb[1] << 6) - ); - - return pack('NN', $block[0], $block[1]); - } - - /** - * Creates the key schedule. - * - * @access private - * @param String $key - * @return Array - */ - function _prepareKey($key) - { - static $shifts = array( // number of key bits shifted per round - 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 - ); - - // pad the key and remove extra characters as appropriate. - $key = str_pad(substr($key, 0, 8), 8, chr(0)); - - $temp = unpack('Na/Nb', $key); - $key = array($temp['a'], $temp['b']); - $msb = array( - ($key[0] >> 31) & 1, - ($key[1] >> 31) & 1 - ); - $key[0] &= 0x7FFFFFFF; - $key[1] &= 0x7FFFFFFF; - - $key = array( - (($key[1] & 0x00000002) << 26) | (($key[1] & 0x00000204) << 17) | - (($key[1] & 0x00020408) << 8) | (($key[1] & 0x02040800) >> 1) | - (($key[0] & 0x00000002) << 22) | (($key[0] & 0x00000204) << 13) | - (($key[0] & 0x00020408) << 4) | (($key[0] & 0x02040800) >> 5) | - (($key[1] & 0x04080000) >> 10) | (($key[0] & 0x04080000) >> 14) | - (($key[1] & 0x08000000) >> 19) | (($key[0] & 0x08000000) >> 23) | - (($key[0] & 0x00000010) >> 1) | (($key[0] & 0x00001000) >> 10) | - (($key[0] & 0x00100000) >> 19) | (($key[0] & 0x10000000) >> 28) - , - (($key[1] & 0x00000080) << 20) | (($key[1] & 0x00008000) << 11) | - (($key[1] & 0x00800000) << 2) | (($key[0] & 0x00000080) << 16) | - (($key[0] & 0x00008000) << 7) | (($key[0] & 0x00800000) >> 2) | - (($key[1] & 0x00000040) << 13) | (($key[1] & 0x00004000) << 4) | - (($key[1] & 0x00400000) >> 5) | (($key[1] & 0x40000000) >> 14) | - (($key[0] & 0x00000040) << 9) | ( $key[0] & 0x00004000 ) | - (($key[0] & 0x00400000) >> 9) | (($key[0] & 0x40000000) >> 18) | - (($key[1] & 0x00000020) << 6) | (($key[1] & 0x00002000) >> 3) | - (($key[1] & 0x00200000) >> 12) | (($key[1] & 0x20000000) >> 21) | - (($key[0] & 0x00000020) << 2) | (($key[0] & 0x00002000) >> 7) | - (($key[0] & 0x00200000) >> 16) | (($key[0] & 0x20000000) >> 25) | - (($key[1] & 0x00000010) >> 1) | (($key[1] & 0x00001000) >> 10) | - (($key[1] & 0x00100000) >> 19) | (($key[1] & 0x10000000) >> 28) | - ($msb[1] << 24) | ($msb[0] << 20) - ); - - $keys = array(); - for ($i = 0; $i < 16; $i++) { - $key[0] <<= $shifts[$i]; - $temp = ($key[0] & 0xF0000000) >> 28; - $key[0] = ($key[0] | $temp) & 0x0FFFFFFF; - - $key[1] <<= $shifts[$i]; - $temp = ($key[1] & 0xF0000000) >> 28; - $key[1] = ($key[1] | $temp) & 0x0FFFFFFF; - - $temp = array( - (($key[1] & 0x00004000) >> 9) | (($key[1] & 0x00000800) >> 7) | - (($key[1] & 0x00020000) >> 14) | (($key[1] & 0x00000010) >> 2) | - (($key[1] & 0x08000000) >> 26) | (($key[1] & 0x00800000) >> 23) - , - (($key[1] & 0x02400000) >> 20) | (($key[1] & 0x00000001) << 4) | - (($key[1] & 0x00002000) >> 10) | (($key[1] & 0x00040000) >> 18) | - (($key[1] & 0x00000080) >> 6) - , - ( $key[1] & 0x00000020 ) | (($key[1] & 0x00000200) >> 5) | - (($key[1] & 0x00010000) >> 13) | (($key[1] & 0x01000000) >> 22) | - (($key[1] & 0x00000004) >> 1) | (($key[1] & 0x00100000) >> 20) - , - (($key[1] & 0x00001000) >> 7) | (($key[1] & 0x00200000) >> 17) | - (($key[1] & 0x00000002) << 2) | (($key[1] & 0x00000100) >> 6) | - (($key[1] & 0x00008000) >> 14) | (($key[1] & 0x04000000) >> 26) - , - (($key[0] & 0x00008000) >> 10) | ( $key[0] & 0x00000010 ) | - (($key[0] & 0x02000000) >> 22) | (($key[0] & 0x00080000) >> 17) | - (($key[0] & 0x00000200) >> 8) | (($key[0] & 0x00000002) >> 1) - , - (($key[0] & 0x04000000) >> 21) | (($key[0] & 0x00010000) >> 12) | - (($key[0] & 0x00000020) >> 2) | (($key[0] & 0x00000800) >> 9) | - (($key[0] & 0x00800000) >> 22) | (($key[0] & 0x00000100) >> 8) - , - (($key[0] & 0x00001000) >> 7) | (($key[0] & 0x00000088) >> 3) | - (($key[0] & 0x00020000) >> 14) | (($key[0] & 0x00000001) << 2) | - (($key[0] & 0x00400000) >> 21) - , - (($key[0] & 0x00000400) >> 5) | (($key[0] & 0x00004000) >> 10) | - (($key[0] & 0x00000040) >> 3) | (($key[0] & 0x00100000) >> 18) | - (($key[0] & 0x08000000) >> 26) | (($key[0] & 0x01000000) >> 24) - ); - - $keys[] = $temp; - } - - $temp = array( - CRYPT_DES_ENCRYPT => $keys, - CRYPT_DES_DECRYPT => array_reverse($keys) - ); - - return $temp; - } - - /** - * String Shift - * - * Inspired by array_shift - * - * @param String $string - * @param optional Integer $index - * @return String - * @access private - */ - function _string_shift(&$string, $index = 1) - { - $substr = substr($string, 0, $index); - $string = substr($string, $index); - return $substr; - } -} - -// vim: ts=4:sw=4:et: -// vim6: fdl=1: \ No newline at end of file +<?php + +/** + * 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: Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + * @category Crypt + * @package Crypt_DES + * @author Jim Wigginton <[email protected]> + * @copyright 2007 Jim Wigginton + * @license http://www.opensource.org/licenses/mit-license.html MIT License + * @link http://phpseclib.sourceforge.net + */ + +/** + * Include Crypt_Base + * + * Base cipher class + */ +if (!class_exists('Crypt_Base')) { + include_once 'Base.php'; +} + +/**#@+ + * @access private + * @see self::_setupKey() + * @see self::_processBlock() + */ +/** + * Contains $keys[CRYPT_DES_ENCRYPT] + */ +define('CRYPT_DES_ENCRYPT', 0); +/** + * Contains $keys[CRYPT_DES_DECRYPT] + */ +define('CRYPT_DES_DECRYPT', 1); +/**#@-*/ + +/**#@+ + * @access public + * @see self::encrypt() + * @see self::decrypt() + */ +/** + * Encrypt / decrypt using the Counter mode. + * + * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode. + * + * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29 + */ +define('CRYPT_DES_MODE_CTR', CRYPT_MODE_CTR); +/** + * Encrypt / decrypt using the Electronic Code Book mode. + * + * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29 + */ +define('CRYPT_DES_MODE_ECB', CRYPT_MODE_ECB); +/** + * Encrypt / decrypt using the Code Book Chaining mode. + * + * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29 + */ +define('CRYPT_DES_MODE_CBC', CRYPT_MODE_CBC); +/** + * Encrypt / decrypt using the Cipher Feedback mode. + * + * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29 + */ +define('CRYPT_DES_MODE_CFB', CRYPT_MODE_CFB); +/** + * Encrypt / decrypt using the Cipher Feedback mode. + * + * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29 + */ +define('CRYPT_DES_MODE_OFB', CRYPT_MODE_OFB); +/**#@-*/ + +/** + * Pure-PHP implementation of DES. + * + * @package Crypt_DES + * @author Jim Wigginton <[email protected]> + * @access public + */ +class Crypt_DES extends Crypt_Base +{ + /** + * Block Length of the cipher + * + * @see Crypt_Base::block_size + * @var int + * @access private + */ + var $block_size = 8; + + /** + * Key Length (in bytes) + * + * @see Crypt_Base::setKeyLength() + * @var int + * @access private + */ + var $key_length = 8; + + /** + * The namespace used by the cipher for its constants. + * + * @see Crypt_Base::const_namespace + * @var string + * @access private + */ + var $const_namespace = 'DES'; + + /** + * The mcrypt specific name of the cipher + * + * @see Crypt_Base::cipher_name_mcrypt + * @var string + * @access private + */ + var $cipher_name_mcrypt = 'des'; + + /** + * The OpenSSL names of the cipher / modes + * + * @see Crypt_Base::openssl_mode_names + * @var array + * @access private + */ + var $openssl_mode_names = array( + CRYPT_MODE_ECB => 'des-ecb', + CRYPT_MODE_CBC => 'des-cbc', + CRYPT_MODE_CFB => 'des-cfb', + CRYPT_MODE_OFB => 'des-ofb' + // CRYPT_MODE_CTR is undefined for DES + ); + + /** + * Optimizing value while CFB-encrypting + * + * @see Crypt_Base::cfb_init_len + * @var int + * @access private + */ + var $cfb_init_len = 500; + + /** + * Switch for DES/3DES encryption + * + * Used only if $engine == CRYPT_DES_MODE_INTERNAL + * + * @see self::_setupKey() + * @see self::_processBlock() + * @var int + * @access private + */ + var $des_rounds = 1; + + /** + * max possible size of $key + * + * @see self::setKey() + * @var string + * @access private + */ + var $key_length_max = 8; + + /** + * The Key Schedule + * + * @see self::_setupKey() + * @var array + * @access private + */ + var $keys; + + /** + * Shuffle table. + * + * For each byte value index, the entry holds an 8-byte string + * with each byte containing all bits in the same state as the + * corresponding bit in the index value. + * + * @see self::_processBlock() + * @see self::_setupKey() + * @var array + * @access private + */ + var $shuffle = array( + "\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\xFF", + "\x00\x00\x00\x00\x00\x00\xFF\x00", "\x00\x00\x00\x00\x00\x00\xFF\xFF", + "\x00\x00\x00\x00\x00\xFF\x00\x00", "\x00\x00\x00\x00\x00\xFF\x00\xFF", + "\x00\x00\x00\x00\x00\xFF\xFF\x00", "\x00\x00\x00\x00\x00\xFF\xFF\xFF", + "\x00\x00\x00\x00\xFF\x00\x00\x00", "\x00\x00\x00\x00\xFF\x00\x00\xFF", + "\x00\x00\x00\x00\xFF\x00\xFF\x00", "\x00\x00\x00\x00\xFF\x00\xFF\xFF", + "\x00\x00\x00\x00\xFF\xFF\x00\x00", "\x00\x00\x00\x00\xFF\xFF\x00\xFF", + "\x00\x00\x00\x00\xFF\xFF\xFF\x00", "\x00\x00\x00\x00\xFF\xFF\xFF\xFF", + "\x00\x00\x00\xFF\x00\x00\x00\x00", "\x00\x00\x00\xFF\x00\x00\x00\xFF", + "\x00\x00\x00\xFF\x00\x00\xFF\x00", "\x00\x00\x00\xFF\x00\x00\xFF\xFF", + "\x00\x00\x00\xFF\x00\xFF\x00\x00", "\x00\x00\x00\xFF\x00\xFF\x00\xFF", + "\x00\x00\x00\xFF\x00\xFF\xFF\x00", "\x00\x00\x00\xFF\x00\xFF\xFF\xFF", + "\x00\x00\x00\xFF\xFF\x00\x00\x00", "\x00\x00\x00\xFF\xFF\x00\x00\xFF", + "\x00\x00\x00\xFF\xFF\x00\xFF\x00", "\x00\x00\x00\xFF\xFF\x00\xFF\xFF", + "\x00\x00\x00\xFF\xFF\xFF\x00\x00", "\x00\x00\x00\xFF\xFF\xFF\x00\xFF", + "\x00\x00\x00\xFF\xFF\xFF\xFF\x00", "\x00\x00\x00\xFF\xFF\xFF\xFF\xFF", + "\x00\x00\xFF\x00\x00\x00\x00\x00", "\x00\x00\xFF\x00\x00\x00\x00\xFF", + "\x00\x00\xFF\x00\x00\x00\xFF\x00", "\x00\x00\xFF\x00\x00\x00\xFF\xFF", + "\x00\x00\xFF\x00\x00\xFF\x00\x00", "\x00\x00\xFF\x00\x00\xFF\x00\xFF", + "\x00\x00\xFF\x00\x00\xFF\xFF\x00", "\x00\x00\xFF\x00\x00\xFF\xFF\xFF", + "\x00\x00\xFF\x00\xFF\x00\x00\x00", "\x00\x00\xFF\x00\xFF\x00\x00\xFF", + "\x00\x00\xFF\x00\xFF\x00\xFF\x00", "\x00\x00\xFF\x00\xFF\x00\xFF\xFF", + "\x00\x00\xFF\x00\xFF\xFF\x00\x00", "\x00\x00\xFF\x00\xFF\xFF\x00\xFF", + "\x00\x00\xFF\x00\xFF\xFF\xFF\x00", "\x00\x00\xFF\x00\xFF\xFF\xFF\xFF", + "\x00\x00\xFF\xFF\x00\x00\x00\x00", "\x00\x00\xFF\xFF\x00\x00\x00\xFF", + "\x00\x00\xFF\xFF\x00\x00\xFF\x00", "\x00\x00\xFF\xFF\x00\x00\xFF\xFF", + "\x00\x00\xFF\xFF\x00\xFF\x00\x00", "\x00\x00\xFF\xFF\x00\xFF\x00\xFF", + "\x00\x00\xFF\xFF\x00\xFF\xFF\x00", "\x00\x00\xFF\xFF\x00\xFF\xFF\xFF", + "\x00\x00\xFF\xFF\xFF\x00\x00\x00", "\x00\x00\xFF\xFF\xFF\x00\x00\xFF", + "\x00\x00\xFF\xFF\xFF\x00\xFF\x00", "\x00\x00\xFF\xFF\xFF\x00\xFF\xFF", + "\x00\x00\xFF\xFF\xFF\xFF\x00\x00", "\x00\x00\xFF\xFF\xFF\xFF\x00\xFF", + "\x00\x00\xFF\xFF\xFF\xFF\xFF\x00", "\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF", + "\x00\xFF\x00\x00\x00\x00\x00\x00", "\x00\xFF\x00\x00\x00\x00\x00\xFF", + "\x00\xFF\x00\x00\x00\x00\xFF\x00", "\x00\xFF\x00\x00\x00\x00\xFF\xFF", + "\x00\xFF\x00\x00\x00\xFF\x00\x00", "\x00\xFF\x00\x00\x00\xFF\x00\xFF", + "\x00\xFF\x00\x00\x00\xFF\xFF\x00", "\x00\xFF\x00\x00\x00\xFF\xFF\xFF", + "\x00\xFF\x00\x00\xFF\x00\x00\x00", "\x00\xFF\x00\x00\xFF\x00\x00\xFF", + "\x00\xFF\x00\x00\xFF\x00\xFF\x00", "\x00\xFF\x00\x00\xFF\x00\xFF\xFF", + "\x00\xFF\x00\x00\xFF\xFF\x00\x00", "\x00\xFF\x00\x00\xFF\xFF\x00\xFF", + "\x00\xFF\x00\x00\xFF\xFF\xFF\x00", "\x00\xFF\x00\x00\xFF\xFF\xFF\xFF", + "\x00\xFF\x00\xFF\x00\x00\x00\x00", "\x00\xFF\x00\xFF\x00\x00\x00\xFF", + "\x00\xFF\x00\xFF\x00\x00\xFF\x00", "\x00\xFF\x00\xFF\x00\x00\xFF\xFF", + "\x00\xFF\x00\xFF\x00\xFF\x00\x00", "\x00\xFF\x00\xFF\x00\xFF\x00\xFF", + "\x00\xFF\x00\xFF\x00\xFF\xFF\x00", "\x00\xFF\x00\xFF\x00\xFF\xFF\xFF", + "\x00\xFF\x00\xFF\xFF\x00\x00\x00", "\x00\xFF\x00\xFF\xFF\x00\x00\xFF", + "\x00\xFF\x00\xFF\xFF\x00\xFF\x00", "\x00\xFF\x00\xFF\xFF\x00\xFF\xFF", + "\x00\xFF\x00\xFF\xFF\xFF\x00\x00", "\x00\xFF\x00\xFF\xFF\xFF\x00\xFF", + "\x00\xFF\x00\xFF\xFF\xFF\xFF\x00", "\x00\xFF\x00\xFF\xFF\xFF\xFF\xFF", + "\x00\xFF\xFF\x00\x00\x00\x00\x00", "\x00\xFF\xFF\x00\x00\x00\x00\xFF", + "\x00\xFF\xFF\x00\x00\x00\xFF\x00", "\x00\xFF\xFF\x00\x00\x00\xFF\xFF", + "\x00\xFF\xFF\x00\x00\xFF\x00\x00", "\x00\xFF\xFF\x00\x00\xFF\x00\xFF", + "\x00\xFF\xFF\x00\x00\xFF\xFF\x00", "\x00\xFF\xFF\x00\x00\xFF\xFF\xFF", + "\x00\xFF\xFF\x00\xFF\x00\x00\x00", "\x00\xFF\xFF\x00\xFF\x00\x00\xFF", + "\x00\xFF\xFF\x00\xFF\x00\xFF\x00", "\x00\xFF\xFF\x00\xFF\x00\xFF\xFF", + "\x00\xFF\xFF\x00\xFF\xFF\x00\x00", "\x00\xFF\xFF\x00\xFF\xFF\x00\xFF", + "\x00\xFF\xFF\x00\xFF\xFF\xFF\x00", "\x00\xFF\xFF\x00\xFF\xFF\xFF\xFF", + "\x00\xFF\xFF\xFF\x00\x00\x00\x00", "\x00\xFF\xFF\xFF\x00\x00\x00\xFF", + "\x00\xFF\xFF\xFF\x00\x00\xFF\x00", "\x00\xFF\xFF\xFF\x00\x00\xFF\xFF", + "\x00\xFF\xFF\xFF\x00\xFF\x00\x00", "\x00\xFF\xFF\xFF\x00\xFF\x00\xFF", + "\x00\xFF\xFF\xFF\x00\xFF\xFF\x00", "\x00\xFF\xFF\xFF\x00\xFF\xFF\xFF", + "\x00\xFF\xFF\xFF\xFF\x00\x00\x00", "\x00\xFF\xFF\xFF\xFF\x00\x00\xFF", + "\x00\xFF\xFF\xFF\xFF\x00\xFF\x00", "\x00\xFF\xFF\xFF\xFF\x00\xFF\xFF", + "\x00\xFF\xFF\xFF\xFF\xFF\x00\x00", "\x00\xFF\xFF\xFF\xFF\xFF\x00\xFF", + "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF", + "\xFF\x00\x00\x00\x00\x00\x00\x00", "\xFF\x00\x00\x00\x00\x00\x00\xFF", + "\xFF\x00\x00\x00\x00\x00\xFF\x00", "\xFF\x00\x00\x00\x00\x00\xFF\xFF", + "\xFF\x00\x00\x00\x00\xFF\x00\x00", "\xFF\x00\x00\x00\x00\xFF\x00\xFF", + "\xFF\x00\x00\x00\x00\xFF\xFF\x00", "\xFF\x00\x00\x00\x00\xFF\xFF\xFF", + "\xFF\x00\x00\x00\xFF\x00\x00\x00", "\xFF\x00\x00\x00\xFF\x00\x00\xFF", + "\xFF\x00\x00\x00\xFF\x00\xFF\x00", "\xFF\x00\x00\x00\xFF\x00\xFF\xFF", + "\xFF\x00\x00\x00\xFF\xFF\x00\x00", "\xFF\x00\x00\x00\xFF\xFF\x00\xFF", + "\xFF\x00\x00\x00\xFF\xFF\xFF\x00", "\xFF\x00\x00\x00\xFF\xFF\xFF\xFF", + "\xFF\x00\x00\xFF\x00\x00\x00\x00", "\xFF\x00\x00\xFF\x00\x00\x00\xFF", + "\xFF\x00\x00\xFF\x00\x00\xFF\x00", "\xFF\x00\x00\xFF\x00\x00\xFF\xFF", + "\xFF\x00\x00\xFF\x00\xFF\x00\x00", "\xFF\x00\x00\xFF\x00\xFF\x00\xFF", + "\xFF\x00\x00\xFF\x00\xFF\xFF\x00", "\xFF\x00\x00\xFF\x00\xFF\xFF\xFF", + "\xFF\x00\x00\xFF\xFF\x00\x00\x00", "\xFF\x00\x00\xFF\xFF\x00\x00\xFF", + "\xFF\x00\x00\xFF\xFF\x00\xFF\x00", "\xFF\x00\x00\xFF\xFF\x00\xFF\xFF", + "\xFF\x00\x00\xFF\xFF\xFF\x00\x00", "\xFF\x00\x00\xFF\xFF\xFF\x00\xFF", + "\xFF\x00\x00\xFF\xFF\xFF\xFF\x00", "\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF", + "\xFF\x00\xFF\x00\x00\x00\x00\x00", "\xFF\x00\xFF\x00\x00\x00\x00\xFF", + "\xFF\x00\xFF\x00\x00\x00\xFF\x00", "\xFF\x00\xFF\x00\x00\x00\xFF\xFF", + "\xFF\x00\xFF\x00\x00\xFF\x00\x00", "\xFF\x00\xFF\x00\x00\xFF\x00\xFF", + "\xFF\x00\xFF\x00\x00\xFF\xFF\x00", "\xFF\x00\xFF\x00\x00\xFF\xFF\xFF", + "\xFF\x00\xFF\x00\xFF\x00\x00\x00", "\xFF\x00\xFF\x00\xFF\x00\x00\xFF", + "\xFF\x00\xFF\x00\xFF\x00\xFF\x00", "\xFF\x00\xFF\x00\xFF\x00\xFF\xFF", + "\xFF\x00\xFF\x00\xFF\xFF\x00\x00", "\xFF\x00\xFF\x00\xFF\xFF\x00\xFF", + "\xFF\x00\xFF\x00\xFF\xFF\xFF\x00", "\xFF\x00\xFF\x00\xFF\xFF\xFF\xFF", + "\xFF\x00\xFF\xFF\x00\x00\x00\x00", "\xFF\x00\xFF\xFF\x00\x00\x00\xFF", + "\xFF\x00\xFF\xFF\x00\x00\xFF\x00", "\xFF\x00\xFF\xFF\x00\x00\xFF\xFF", + "\xFF\x00\xFF\xFF\x00\xFF\x00\x00", "\xFF\x00\xFF\xFF\x00\xFF\x00\xFF", + "\xFF\x00\xFF\xFF\x00\xFF\xFF\x00", "\xFF\x00\xFF\xFF\x00\xFF\xFF\xFF", + "\xFF\x00\xFF\xFF\xFF\x00\x00\x00", "\xFF\x00\xFF\xFF\xFF\x00\x00\xFF", + "\xFF\x00\xFF\xFF\xFF\x00\xFF\x00", "\xFF\x00\xFF\xFF\xFF\x00\xFF\xFF", + "\xFF\x00\xFF\xFF\xFF\xFF\x00\x00", "\xFF\x00\xFF\xFF\xFF\xFF\x00\xFF", + "\xFF\x00\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\x00\xFF\xFF\xFF\xFF\xFF\xFF", + "\xFF\xFF\x00\x00\x00\x00\x00\x00", "\xFF\xFF\x00\x00\x00\x00\x00\xFF", + "\xFF\xFF\x00\x00\x00\x00\xFF\x00", "\xFF\xFF\x00\x00\x00\x00\xFF\xFF", + "\xFF\xFF\x00\x00\x00\xFF\x00\x00", "\xFF\xFF\x00\x00\x00\xFF\x00\xFF", + "\xFF\xFF\x00\x00\x00\xFF\xFF\x00", "\xFF\xFF\x00\x00\x00\xFF\xFF\xFF", + "\xFF\xFF\x00\x00\xFF\x00\x00\x00", "\xFF\xFF\x00\x00\xFF\x00\x00\xFF", + "\xFF\xFF\x00\x00\xFF\x00\xFF\x00", "\xFF\xFF\x00\x00\xFF\x00\xFF\xFF", + "\xFF\xFF\x00\x00\xFF\xFF\x00\x00", "\xFF\xFF\x00\x00\xFF\xFF\x00\xFF", + "\xFF\xFF\x00\x00\xFF\xFF\xFF\x00", "\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF", + "\xFF\xFF\x00\xFF\x00\x00\x00\x00", "\xFF\xFF\x00\xFF\x00\x00\x00\xFF", + "\xFF\xFF\x00\xFF\x00\x00\xFF\x00", "\xFF\xFF\x00\xFF\x00\x00\xFF\xFF", + "\xFF\xFF\x00\xFF\x00\xFF\x00\x00", "\xFF\xFF\x00\xFF\x00\xFF\x00\xFF", + "\xFF\xFF\x00\xFF\x00\xFF\xFF\x00", "\xFF\xFF\x00\xFF\x00\xFF\xFF\xFF", + "\xFF\xFF\x00\xFF\xFF\x00\x00\x00", "\xFF\xFF\x00\xFF\xFF\x00\x00\xFF", + "\xFF\xFF\x00\xFF\xFF\x00\xFF\x00", "\xFF\xFF\x00\xFF\xFF\x00\xFF\xFF", + "\xFF\xFF\x00\xFF\xFF\xFF\x00\x00", "\xFF\xFF\x00\xFF\xFF\xFF\x00\xFF", + "\xFF\xFF\x00\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\x00\xFF\xFF\xFF\xFF\xFF", + "\xFF\xFF\xFF\x00\x00\x00\x00\x00", "\xFF\xFF\xFF\x00\x00\x00\x00\xFF", + "\xFF\xFF\xFF\x00\x00\x00\xFF\x00", "\xFF\xFF\xFF\x00\x00\x00\xFF\xFF", + "\xFF\xFF\xFF\x00\x00\xFF\x00\x00", "\xFF\xFF\xFF\x00\x00\xFF\x00\xFF", + "\xFF\xFF\xFF\x00\x00\xFF\xFF\x00", "\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF", + "\xFF\xFF\xFF\x00\xFF\x00\x00\x00", "\xFF\xFF\xFF\x00\xFF\x00\x00\xFF", + "\xFF\xFF\xFF\x00\xFF\x00\xFF\x00", "\xFF\xFF\xFF\x00\xFF\x00\xFF\xFF", + "\xFF\xFF\xFF\x00\xFF\xFF\x00\x00", "\xFF\xFF\xFF\x00\xFF\xFF\x00\xFF", + "\xFF\xFF\xFF\x00\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\x00\xFF\xFF\xFF\xFF", + "\xFF\xFF\xFF\xFF\x00\x00\x00\x00", "\xFF\xFF\xFF\xFF\x00\x00\x00\xFF", + "\xFF\xFF\xFF\xFF\x00\x00\xFF\x00", "\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF", + "\xFF\xFF\xFF\xFF\x00\xFF\x00\x00", "\xFF\xFF\xFF\xFF\x00\xFF\x00\xFF", + "\xFF\xFF\xFF\xFF\x00\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\x00\xFF\xFF\xFF", + "\xFF\xFF\xFF\xFF\xFF\x00\x00\x00", "\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF", + "\xFF\xFF\xFF\xFF\xFF\x00\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\x00\xFF\xFF", + "\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\x00\xFF", + "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF" + ); + + /** + * IP mapping helper table. + * + * Indexing this table with each source byte performs the initial bit permutation. + * + * @var array + * @access private + */ + var $ipmap = array( + 0x00, 0x10, 0x01, 0x11, 0x20, 0x30, 0x21, 0x31, + 0x02, 0x12, 0x03, 0x13, 0x22, 0x32, 0x23, 0x33, + 0x40, 0x50, 0x41, 0x51, 0x60, 0x70, 0x61, 0x71, + 0x42, 0x52, 0x43, 0x53, 0x62, 0x72, 0x63, 0x73, + 0x04, 0x14, 0x05, 0x15, 0x24, 0x34, 0x25, 0x35, + 0x06, 0x16, 0x07, 0x17, 0x26, 0x36, 0x27, 0x37, + 0x44, 0x54, 0x45, 0x55, 0x64, 0x74, 0x65, 0x75, + 0x46, 0x56, 0x47, 0x57, 0x66, 0x76, 0x67, 0x77, + 0x80, 0x90, 0x81, 0x91, 0xA0, 0xB0, 0xA1, 0xB1, + 0x82, 0x92, 0x83, 0x93, 0xA2, 0xB2, 0xA3, 0xB3, + 0xC0, 0xD0, 0xC1, 0xD1, 0xE0, 0xF0, 0xE1, 0xF1, + 0xC2, 0xD2, 0xC3, 0xD3, 0xE2, 0xF2, 0xE3, 0xF3, + 0x84, 0x94, 0x85, 0x95, 0xA4, 0xB4, 0xA5, 0xB5, + 0x86, 0x96, 0x87, 0x97, 0xA6, 0xB6, 0xA7, 0xB7, + 0xC4, 0xD4, 0xC5, 0xD5, 0xE4, 0xF4, 0xE5, 0xF5, + 0xC6, 0xD6, 0xC7, 0xD7, 0xE6, 0xF6, 0xE7, 0xF7, + 0x08, 0x18, 0x09, 0x19, 0x28, 0x38, 0x29, 0x39, + 0x0A, 0x1A, 0x0B, 0x1B, 0x2A, 0x3A, 0x2B, 0x3B, + 0x48, 0x58, 0x49, 0x59, 0x68, 0x78, 0x69, 0x79, + 0x4A, 0x5A, 0x4B, 0x5B, 0x6A, 0x7A, 0x6B, 0x7B, + 0x0C, 0x1C, 0x0D, 0x1D, 0x2C, 0x3C, 0x2D, 0x3D, + 0x0E, 0x1E, 0x0F, 0x1F, 0x2E, 0x3E, 0x2F, 0x3F, + 0x4C, 0x5C, 0x4D, 0x5D, 0x6C, 0x7C, 0x6D, 0x7D, + 0x4E, 0x5E, 0x4F, 0x5F, 0x6E, 0x7E, 0x6F, 0x7F, + 0x88, 0x98, 0x89, 0x99, 0xA8, 0xB8, 0xA9, 0xB9, + 0x8A, 0x9A, 0x8B, 0x9B, 0xAA, 0xBA, 0xAB, 0xBB, + 0xC8, 0xD8, 0xC9, 0xD9, 0xE8, 0xF8, 0xE9, 0xF9, + 0xCA, 0xDA, 0xCB, 0xDB, 0xEA, 0xFA, 0xEB, 0xFB, + 0x8C, 0x9C, 0x8D, 0x9D, 0xAC, 0xBC, 0xAD, 0xBD, + 0x8E, 0x9E, 0x8F, 0x9F, 0xAE, 0xBE, 0xAF, 0xBF, + 0xCC, 0xDC, 0xCD, 0xDD, 0xEC, 0xFC, 0xED, 0xFD, + 0xCE, 0xDE, 0xCF, 0xDF, 0xEE, 0xFE, 0xEF, 0xFF + ); + + /** + * Inverse IP mapping helper table. + * Indexing this table with a byte value reverses the bit order. + * + * @var array + * @access private + */ + var $invipmap = array( + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, + 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, + 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, + 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, + 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, + 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, + 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, + 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, + 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, + 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, + 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, + 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, + 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, + 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, + 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, + 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, + 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, + 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, + 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, + 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, + 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, + 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, + 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, + 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, + 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, + 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, + 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF + ); + + /** + * Pre-permuted S-box1 + * + * Each box ($sbox1-$sbox8) has been vectorized, then each value pre-permuted using the + * P table: concatenation can then be replaced by exclusive ORs. + * + * @var array + * @access private + */ + var $sbox1 = array( + 0x00808200, 0x00000000, 0x00008000, 0x00808202, + 0x00808002, 0x00008202, 0x00000002, 0x00008000, + 0x00000200, 0x00808200, 0x00808202, 0x00000200, + 0x00800202, 0x00808002, 0x00800000, 0x00000002, + 0x00000202, 0x00800200, 0x00800200, 0x00008200, + 0x00008200, 0x00808000, 0x00808000, 0x00800202, + 0x00008002, 0x00800002, 0x00800002, 0x00008002, + 0x00000000, 0x00000202, 0x00008202, 0x00800000, + 0x00008000, 0x00808202, 0x00000002, 0x00808000, + 0x00808200, 0x00800000, 0x00800000, 0x00000200, + 0x00808002, 0x00008000, 0x00008200, 0x00800002, + 0x00000200, 0x00000002, 0x00800202, 0x00008202, + 0x00808202, 0x00008002, 0x00808000, 0x00800202, + 0x00800002, 0x00000202, 0x00008202, 0x00808200, + 0x00000202, 0x00800200, 0x00800200, 0x00000000, + 0x00008002, 0x00008200, 0x00000000, 0x00808002 + ); + + /** + * Pre-permuted S-box2 + * + * @var array + * @access private + */ + var $sbox2 = array( + 0x40084010, 0x40004000, 0x00004000, 0x00084010, + 0x00080000, 0x00000010, 0x40080010, 0x40004010, + 0x40000010, 0x40084010, 0x40084000, 0x40000000, + 0x40004000, 0x00080000, 0x00000010, 0x40080010, + 0x00084000, 0x00080010, 0x40004010, 0x00000000, + 0x40000000, 0x00004000, 0x00084010, 0x40080000, + 0x00080010, 0x40000010, 0x00000000, 0x00084000, + 0x00004010, 0x40084000, 0x40080000, 0x00004010, + 0x00000000, 0x00084010, 0x40080010, 0x00080000, + 0x40004010, 0x40080000, 0x40084000, 0x00004000, + 0x40080000, 0x40004000, 0x00000010, 0x40084010, + 0x00084010, 0x00000010, 0x00004000, 0x40000000, + 0x00004010, 0x40084000, 0x00080000, 0x40000010, + 0x00080010, 0x40004010, 0x40000010, 0x00080010, + 0x00084000, 0x00000000, 0x40004000, 0x00004010, + 0x40000000, 0x40080010, 0x40084010, 0x00084000 + ); + + /** + * Pre-permuted S-box3 + * + * @var array + * @access private + */ + var $sbox3 = array( + 0x00000104, 0x04010100, 0x00000000, 0x04010004, + 0x04000100, 0x00000000, 0x00010104, 0x04000100, + 0x00010004, 0x04000004, 0x04000004, 0x00010000, + 0x04010104, 0x00010004, 0x04010000, 0x00000104, + 0x04000000, 0x00000004, 0x04010100, 0x00000100, + 0x00010100, 0x04010000, 0x04010004, 0x00010104, + 0x04000104, 0x00010100, 0x00010000, 0x04000104, + 0x00000004, 0x04010104, 0x00000100, 0x04000000, + 0x04010100, 0x04000000, 0x00010004, 0x00000104, + 0x00010000, 0x04010100, 0x04000100, 0x00000000, + 0x00000100, 0x00010004, 0x04010104, 0x04000100, + 0x04000004, 0x00000100, 0x00000000, 0x04010004, + 0x04000104, 0x00010000, 0x04000000, 0x04010104, + 0x00000004, 0x00010104, 0x00010100, 0x04000004, + 0x04010000, 0x04000104, 0x00000104, 0x04010000, + 0x00010104, 0x00000004, 0x04010004, 0x00010100 + ); + + /** + * Pre-permuted S-box4 + * + * @var array + * @access private + */ + var $sbox4 = array( + 0x80401000, 0x80001040, 0x80001040, 0x00000040, + 0x00401040, 0x80400040, 0x80400000, 0x80001000, + 0x00000000, 0x00401000, 0x00401000, 0x80401040, + 0x80000040, 0x00000000, 0x00400040, 0x80400000, + 0x80000000, 0x00001000, 0x00400000, 0x80401000, + 0x00000040, 0x00400000, 0x80001000, 0x00001040, + 0x80400040, 0x80000000, 0x00001040, 0x00400040, + 0x00001000, 0x00401040, 0x80401040, 0x80000040, + 0x00400040, 0x80400000, 0x00401000, 0x80401040, + 0x80000040, 0x00000000, 0x00000000, 0x00401000, + 0x00001040, 0x00400040, 0x80400040, 0x80000000, + 0x80401000, 0x80001040, 0x80001040, 0x00000040, + 0x80401040, 0x80000040, 0x80000000, 0x00001000, + 0x80400000, 0x80001000, 0x00401040, 0x80400040, + 0x80001000, 0x00001040, 0x00400000, 0x80401000, + 0x00000040, 0x00400000, 0x00001000, 0x00401040 + ); + + /** + * Pre-permuted S-box5 + * + * @var array + * @access private + */ + var $sbox5 = array( + 0x00000080, 0x01040080, 0x01040000, 0x21000080, + 0x00040000, 0x00000080, 0x20000000, 0x01040000, + 0x20040080, 0x00040000, 0x01000080, 0x20040080, + 0x21000080, 0x21040000, 0x00040080, 0x20000000, + 0x01000000, 0x20040000, 0x20040000, 0x00000000, + 0x20000080, 0x21040080, 0x21040080, 0x01000080, + 0x21040000, 0x20000080, 0x00000000, 0x21000000, + 0x01040080, 0x01000000, 0x21000000, 0x00040080, + 0x00040000, 0x21000080, 0x00000080, 0x01000000, + 0x20000000, 0x01040000, 0x21000080, 0x20040080, + 0x01000080, 0x20000000, 0x21040000, 0x01040080, + 0x20040080, 0x00000080, 0x01000000, 0x21040000, + 0x21040080, 0x00040080, 0x21000000, 0x21040080, + 0x01040000, 0x00000000, 0x20040000, 0x21000000, + 0x00040080, 0x01000080, 0x20000080, 0x00040000, + 0x00000000, 0x20040000, 0x01040080, 0x20000080 + ); + + /** + * Pre-permuted S-box6 + * + * @var array + * @access private + */ + var $sbox6 = array( + 0x10000008, 0x10200000, 0x00002000, 0x10202008, + 0x10200000, 0x00000008, 0x10202008, 0x00200000, + 0x10002000, 0x00202008, 0x00200000, 0x10000008, + 0x00200008, 0x10002000, 0x10000000, 0x00002008, + 0x00000000, 0x00200008, 0x10002008, 0x00002000, + 0x00202000, 0x10002008, 0x00000008, 0x10200008, + 0x10200008, 0x00000000, 0x00202008, 0x10202000, + 0x00002008, 0x00202000, 0x10202000, 0x10000000, + 0x10002000, 0x00000008, 0x10200008, 0x00202000, + 0x10202008, 0x00200000, 0x00002008, 0x10000008, + 0x00200000, 0x10002000, 0x10000000, 0x00002008, + 0x10000008, 0x10202008, 0x00202000, 0x10200000, + 0x00202008, 0x10202000, 0x00000000, 0x10200008, + 0x00000008, 0x00002000, 0x10200000, 0x00202008, + 0x00002000, 0x00200008, 0x10002008, 0x00000000, + 0x10202000, 0x10000000, 0x00200008, 0x10002008 + ); + + /** + * Pre-permuted S-box7 + * + * @var array + * @access private + */ + var $sbox7 = array( + 0x00100000, 0x02100001, 0x02000401, 0x00000000, + 0x00000400, 0x02000401, 0x00100401, 0x02100400, + 0x02100401, 0x00100000, 0x00000000, 0x02000001, + 0x00000001, 0x02000000, 0x02100001, 0x00000401, + 0x02000400, 0x00100401, 0x00100001, 0x02000400, + 0x02000001, 0x02100000, 0x02100400, 0x00100001, + 0x02100000, 0x00000400, 0x00000401, 0x02100401, + 0x00100400, 0x00000001, 0x02000000, 0x00100400, + 0x02000000, 0x00100400, 0x00100000, 0x02000401, + 0x02000401, 0x02100001, 0x02100001, 0x00000001, + 0x00100001, 0x02000000, 0x02000400, 0x00100000, + 0x02100400, 0x00000401, 0x00100401, 0x02100400, + 0x00000401, 0x02000001, 0x02100401, 0x02100000, + 0x00100400, 0x00000000, 0x00000001, 0x02100401, + 0x00000000, 0x00100401, 0x02100000, 0x00000400, + 0x02000001, 0x02000400, 0x00000400, 0x00100001 + ); + + /** + * Pre-permuted S-box8 + * + * @var array + * @access private + */ + var $sbox8 = array( + 0x08000820, 0x00000800, 0x00020000, 0x08020820, + 0x08000000, 0x08000820, 0x00000020, 0x08000000, + 0x00020020, 0x08020000, 0x08020820, 0x00020800, + 0x08020800, 0x00020820, 0x00000800, 0x00000020, + 0x08020000, 0x08000020, 0x08000800, 0x00000820, + 0x00020800, 0x00020020, 0x08020020, 0x08020800, + 0x00000820, 0x00000000, 0x00000000, 0x08020020, + 0x08000020, 0x08000800, 0x00020820, 0x00020000, + 0x00020820, 0x00020000, 0x08020800, 0x00000800, + 0x00000020, 0x08020020, 0x00000800, 0x00020820, + 0x08000800, 0x00000020, 0x08000020, 0x08020000, + 0x08020020, 0x08000000, 0x00020000, 0x08000820, + 0x00000000, 0x08020820, 0x00020020, 0x08000020, + 0x08020000, 0x08000800, 0x08000820, 0x00000000, + 0x08020820, 0x00020800, 0x00020800, 0x00000820, + 0x00000820, 0x00020020, 0x08000000, 0x08020800 + ); + + /** + * Test for engine validity + * + * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine() + * + * @see Crypt_Base::isValidEngine() + * @param int $engine + * @access public + * @return bool + */ + function isValidEngine($engine) + { + if ($this->key_length_max == 8) { + if ($engine == CRYPT_ENGINE_OPENSSL) { + $this->cipher_name_openssl_ecb = 'des-ecb'; + $this->cipher_name_openssl = 'des-' . $this->_openssl_translate_mode(); + } + } + + return parent::isValidEngine($engine); + } + + /** + * Sets the key. + * + * Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we + * only use the first eight, if $key has more then eight characters in it, and pad $key with the + * null byte if it is less then eight characters long. + * + * DES also requires that every eighth bit be a parity bit, however, we'll ignore that. + * + * If the key is not explicitly set, it'll be assumed to be all zero's. + * + * @see Crypt_Base::setKey() + * @access public + * @param string $key + */ + function setKey($key) + { + // We check/cut here only up to max length of the key. + // Key padding to the proper length will be done in _setupKey() + if (strlen($key) > $this->key_length_max) { + $key = substr($key, 0, $this->key_length_max); + } + + // Sets the key + parent::setKey($key); + } + + /** + * Encrypts a block + * + * @see Crypt_Base::_encryptBlock() + * @see Crypt_Base::encrypt() + * @see self::encrypt() + * @access private + * @param string $in + * @return string + */ + function _encryptBlock($in) + { + return $this->_processBlock($in, CRYPT_DES_ENCRYPT); + } + + /** + * Decrypts a block + * + * @see Crypt_Base::_decryptBlock() + * @see Crypt_Base::decrypt() + * @see self::decrypt() + * @access private + * @param string $in + * @return string + */ + function _decryptBlock($in) + { + return $this->_processBlock($in, CRYPT_DES_DECRYPT); + } + + /** + * Encrypts or decrypts a 64-bit block + * + * $mode should be either CRYPT_DES_ENCRYPT or CRYPT_DES_DECRYPT. See + * {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general + * idea of what this function does. + * + * @see self::_encryptBlock() + * @see self::_decryptBlock() + * @access private + * @param string $block + * @param int $mode + * @return string + */ + function _processBlock($block, $mode) + { + static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip; + if (!$sbox1) { + $sbox1 = array_map("intval", $this->sbox1); + $sbox2 = array_map("intval", $this->sbox2); + $sbox3 = array_map("intval", $this->sbox3); + $sbox4 = array_map("intval", $this->sbox4); + $sbox5 = array_map("intval", $this->sbox5); + $sbox6 = array_map("intval", $this->sbox6); + $sbox7 = array_map("intval", $this->sbox7); + $sbox8 = array_map("intval", $this->sbox8); + /* Merge $shuffle with $[inv]ipmap */ + for ($i = 0; $i < 256; ++$i) { + $shuffleip[] = $this->shuffle[$this->ipmap[$i]]; + $shuffleinvip[] = $this->shuffle[$this->invipmap[$i]]; + } + } + + $keys = $this->keys[$mode]; + $ki = -1; + + // Do the initial IP permutation. + $t = unpack('Nl/Nr', $block); + list($l, $r) = array($t['l'], $t['r']); + $block = ($shuffleip[ $r & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") | + ($shuffleip[($r >> 8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") | + ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") | + ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") | + ($shuffleip[ $l & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") | + ($shuffleip[($l >> 8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") | + ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") | + ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01"); + + // Extract L0 and R0. + $t = unpack('Nl/Nr', $block); + list($l, $r) = array($t['l'], $t['r']); + + for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) { + // Perform the 16 steps. + for ($i = 0; $i < 16; $i++) { + // start of "the Feistel (F) function" - see the following URL: + // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png + // Merge key schedule. + $b1 = (($r >> 3) & 0x1FFFFFFF) ^ ($r << 29) ^ $keys[++$ki]; + $b2 = (($r >> 31) & 0x00000001) ^ ($r << 1) ^ $keys[++$ki]; + + // S-box indexing. + $t = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^ + $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^ + $sbox5[($b1 >> 8) & 0x3F] ^ $sbox6[($b2 >> 8) & 0x3F] ^ + $sbox7[ $b1 & 0x3F] ^ $sbox8[ $b2 & 0x3F] ^ $l; + // end of "the Feistel (F) function" + + $l = $r; + $r = $t; + } + + // Last step should not permute L & R. + $t = $l; + $l = $r; + $r = $t; + } + + // Perform the inverse IP permutation. + return ($shuffleinvip[($r >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") | + ($shuffleinvip[($l >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") | + ($shuffleinvip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") | + ($shuffleinvip[($l >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") | + ($shuffleinvip[($r >> 8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") | + ($shuffleinvip[($l >> 8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") | + ($shuffleinvip[ $r & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") | + ($shuffleinvip[ $l & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01"); + } + + /** + * Creates the key schedule + * + * @see Crypt_Base::_setupKey() + * @access private + */ + function _setupKey() + { + if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->des_rounds === $this->kl['des_rounds']) { + // already expanded + return; + } + $this->kl = array('key' => $this->key, 'des_rounds' => $this->des_rounds); + + static $shifts = array( // number of key bits shifted per round + 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 + ); + + static $pc1map = array( + 0x00, 0x00, 0x08, 0x08, 0x04, 0x04, 0x0C, 0x0C, + 0x02, 0x02, 0x0A, 0x0A, 0x06, 0x06, 0x0E, 0x0E, + 0x10, 0x10, 0x18, 0x18, 0x14, 0x14, 0x1C, 0x1C, + 0x12, 0x12, 0x1A, 0x1A, 0x16, 0x16, 0x1E, 0x1E, + 0x20, 0x20, 0x28, 0x28, 0x24, 0x24, 0x2C, 0x2C, + 0x22, 0x22, 0x2A, 0x2A, 0x26, 0x26, 0x2E, 0x2E, + 0x30, 0x30, 0x38, 0x38, 0x34, 0x34, 0x3C, 0x3C, + 0x32, 0x32, 0x3A, 0x3A, 0x36, 0x36, 0x3E, 0x3E, + 0x40, 0x40, 0x48, 0x48, 0x44, 0x44, 0x4C, 0x4C, + 0x42, 0x42, 0x4A, 0x4A, 0x46, 0x46, 0x4E, 0x4E, + 0x50, 0x50, 0x58, 0x58, 0x54, 0x54, 0x5C, 0x5C, + 0x52, 0x52, 0x5A, 0x5A, 0x56, 0x56, 0x5E, 0x5E, + 0x60, 0x60, 0x68, 0x68, 0x64, 0x64, 0x6C, 0x6C, + 0x62, 0x62, 0x6A, 0x6A, 0x66, 0x66, 0x6E, 0x6E, + 0x70, 0x70, 0x78, 0x78, 0x74, 0x74, 0x7C, 0x7C, + 0x72, 0x72, 0x7A, 0x7A, 0x76, 0x76, 0x7E, 0x7E, + 0x80, 0x80, 0x88, 0x88, 0x84, 0x84, 0x8C, 0x8C, + 0x82, 0x82, 0x8A, 0x8A, 0x86, 0x86, 0x8E, 0x8E, + 0x90, 0x90, 0x98, 0x98, 0x94, 0x94, 0x9C, 0x9C,
[... 658 lines stripped ...]
