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816 lines
27 KiB
816 lines
27 KiB
<?php |
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */ |
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|
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/** |
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* Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions. |
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* |
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* Uses hash() or mhash() if available and an internal implementation, otherwise. Currently supports the following: |
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* |
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* md2, md5, md5-96, sha1, sha1-96, sha256, sha384, and sha512 |
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* |
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* If {@link Crypt_Hash::setKey() setKey()} is called, {@link Crypt_Hash::hash() hash()} will return the HMAC as opposed to |
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* the hash. If no valid algorithm is provided, sha1 will be used. |
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* |
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* PHP versions 4 and 5 |
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* |
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* {@internal The variable names are the same as those in |
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* {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}} |
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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/Hash.php'); |
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* |
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* $hash = new Crypt_Hash('sha1'); |
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* |
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* $hash->setKey('abcdefg'); |
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* |
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* echo base64_encode($hash->hash('abcdefg')); |
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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_Hash |
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* @author Jim Wigginton <terrafrost@php.net> |
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* @copyright MMVII Jim Wigginton |
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* @license http://www.gnu.org/licenses/lgpl.txt |
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* @version $Id: Hash.php,v 1.6 2009/11/23 23:37:07 terrafrost Exp $ |
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* @link http://phpseclib.sourceforge.net |
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*/ |
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/**#@+ |
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* @access private |
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* @see Crypt_Hash::Crypt_Hash() |
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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_HASH_MODE_INTERNAL', 1); |
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/** |
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* Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+. |
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*/ |
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define('CRYPT_HASH_MODE_MHASH', 2); |
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/** |
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* Toggles the hash() implementation, which works on PHP 5.1.2+. |
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*/ |
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define('CRYPT_HASH_MODE_HASH', 3); |
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/**#@-*/ |
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|
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/** |
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* Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions. |
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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_Hash |
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*/ |
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class Crypt_Hash { |
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/** |
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* Byte-length of compression blocks / key (Internal HMAC) |
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* |
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* @see Crypt_Hash::setAlgorithm() |
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* @var Integer |
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* @access private |
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*/ |
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var $b; |
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/** |
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* Byte-length of hash output (Internal HMAC) |
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* |
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* @see Crypt_Hash::setHash() |
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* @var Integer |
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* @access private |
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*/ |
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var $l = false; |
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/** |
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* Hash Algorithm |
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* |
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* @see Crypt_Hash::setHash() |
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* @var String |
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* @access private |
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*/ |
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var $hash; |
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|
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/** |
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* Key |
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* |
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* @see Crypt_Hash::setKey() |
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* @var String |
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* @access private |
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*/ |
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var $key = ''; |
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|
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/** |
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* Outer XOR (Internal HMAC) |
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* |
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* @see Crypt_Hash::setKey() |
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* @var String |
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* @access private |
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*/ |
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var $opad; |
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|
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/** |
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* Inner XOR (Internal HMAC) |
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* |
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* @see Crypt_Hash::setKey() |
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* @var String |
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* @access private |
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*/ |
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var $ipad; |
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|
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/** |
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* Default Constructor. |
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* |
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* @param optional String $hash |
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* @return Crypt_Hash |
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* @access public |
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*/ |
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function Crypt_Hash($hash = 'sha1') |
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{ |
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if ( !defined('CRYPT_HASH_MODE') ) { |
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switch (true) { |
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case extension_loaded('hash'): |
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define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH); |
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break; |
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case extension_loaded('mhash'): |
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define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH); |
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break; |
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default: |
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define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL); |
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} |
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} |
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$this->setHash($hash); |
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} |
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/** |
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* Sets the key for HMACs |
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* |
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* Keys can be of any length. |
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* |
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* @access public |
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* @param String $key |
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*/ |
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function setKey($key) |
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{ |
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$this->key = $key; |
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} |
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/** |
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* Sets the hash function. |
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* |
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* @access public |
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* @param String $hash |
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*/ |
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function setHash($hash) |
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{ |
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switch ($hash) { |
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case 'md5-96': |
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case 'sha1-96': |
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$this->l = 12; // 96 / 8 = 12 |
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break; |
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case 'md2': |
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case 'md5': |
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$this->l = 16; |
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break; |
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case 'sha1': |
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$this->l = 20; |
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break; |
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case 'sha256': |
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$this->l = 32; |
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break; |
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case 'sha384': |
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$this->l = 48; |
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break; |
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case 'sha512': |
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$this->l = 64; |
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} |
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switch ($hash) { |
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case 'md2': |
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$mode = CRYPT_HASH_MODE_INTERNAL; |
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break; |
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case 'sha384': |
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case 'sha512': |
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$mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE; |
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break; |
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default: |
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$mode = CRYPT_HASH_MODE; |
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} |
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switch ( $mode ) { |
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case CRYPT_HASH_MODE_MHASH: |
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switch ($hash) { |
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case 'md5': |
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case 'md5-96': |
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$this->hash = MHASH_MD5; |
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break; |
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case 'sha256': |
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$this->hash = MHASH_SHA256; |
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break; |
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case 'sha1': |
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case 'sha1-96': |
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default: |
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$this->hash = MHASH_SHA1; |
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} |
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return; |
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case CRYPT_HASH_MODE_HASH: |
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switch ($hash) { |
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case 'md5': |
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case 'md5-96': |
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$this->hash = 'md5'; |
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return; |
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case 'sha256': |
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case 'sha384': |
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case 'sha512': |
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$this->hash = $hash; |
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return; |
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case 'sha1': |
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case 'sha1-96': |
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default: |
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$this->hash = 'sha1'; |
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} |
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return; |
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} |
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switch ($hash) { |
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case 'md2': |
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$this->b = 16; |
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$this->hash = array($this, '_md2'); |
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break; |
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case 'md5': |
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case 'md5-96': |
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$this->b = 64; |
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$this->hash = array($this, '_md5'); |
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break; |
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case 'sha256': |
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$this->b = 64; |
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$this->hash = array($this, '_sha256'); |
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break; |
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case 'sha384': |
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case 'sha512': |
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$this->b = 128; |
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$this->hash = array($this, '_sha512'); |
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break; |
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case 'sha1': |
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case 'sha1-96': |
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default: |
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$this->b = 64; |
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$this->hash = array($this, '_sha1'); |
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} |
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$this->ipad = str_repeat(chr(0x36), $this->b); |
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$this->opad = str_repeat(chr(0x5C), $this->b); |
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} |
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/** |
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* Compute the HMAC. |
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* |
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* @access public |
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* @param String $text |
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* @return String |
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*/ |
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function hash($text) |
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{ |
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$mode = is_array($this->hash) ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE; |
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if (!empty($this->key)) { |
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switch ( $mode ) { |
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case CRYPT_HASH_MODE_MHASH: |
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$output = mhash($this->hash, $text, $this->key); |
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break; |
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case CRYPT_HASH_MODE_HASH: |
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$output = hash_hmac($this->hash, $text, $this->key, true); |
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break; |
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case CRYPT_HASH_MODE_INTERNAL: |
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/* "Applications that use keys longer than B bytes will first hash the key using H and then use the |
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resultant L byte string as the actual key to HMAC." |
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-- http://tools.ietf.org/html/rfc2104#section-2 */ |
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$key = strlen($this->key) > $this->b ? call_user_func($this->$hash, $this->key) : $this->key; |
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$key = str_pad($key, $this->b, chr(0)); // step 1 |
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$temp = $this->ipad ^ $key; // step 2 |
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$temp .= $text; // step 3 |
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$temp = call_user_func($this->hash, $temp); // step 4 |
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$output = $this->opad ^ $key; // step 5 |
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$output.= $temp; // step 6 |
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$output = call_user_func($this->hash, $output); // step 7 |
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} |
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} else { |
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switch ( $mode ) { |
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case CRYPT_HASH_MODE_MHASH: |
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$output = mhash($this->hash, $text); |
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break; |
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case CRYPT_HASH_MODE_HASH: |
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$output = hash($this->hash, $text, true); |
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break; |
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case CRYPT_HASH_MODE_INTERNAL: |
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$output = call_user_func($this->hash, $text); |
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} |
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} |
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return substr($output, 0, $this->l); |
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} |
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/** |
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* Returns the hash length (in bytes) |
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* |
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* @access private |
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* @return Integer |
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*/ |
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function getLength() |
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{ |
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return $this->l; |
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} |
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/** |
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* Wrapper for MD5 |
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* |
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* @access private |
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* @param String $text |
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*/ |
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function _md5($m) |
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{ |
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return pack('H*', md5($m)); |
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} |
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/** |
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* Wrapper for SHA1 |
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* |
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* @access private |
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* @param String $text |
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*/ |
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function _sha1($m) |
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{ |
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return pack('H*', sha1($m)); |
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} |
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/** |
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* Pure-PHP implementation of MD2 |
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* |
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* See {@link http://tools.ietf.org/html/rfc1319 RFC1319}. |
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* |
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* @access private |
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* @param String $text |
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*/ |
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function _md2($m) |
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{ |
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static $s = array( |
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41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, |
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19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, |
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76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, |
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138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, |
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245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, |
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148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, |
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39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, |
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181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, |
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150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, |
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112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, |
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96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, |
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85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, |
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234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, |
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129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, |
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8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, |
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203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, |
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166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, |
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31, 26, 219, 153, 141, 51, 159, 17, 131, 20 |
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); |
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// Step 1. Append Padding Bytes |
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$pad = 16 - (strlen($m) & 0xF); |
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$m.= str_repeat(chr($pad), $pad); |
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|
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$length = strlen($m); |
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|
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// Step 2. Append Checksum |
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$c = str_repeat(chr(0), 16); |
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$l = chr(0); |
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for ($i = 0; $i < $length; $i+= 16) { |
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for ($j = 0; $j < 16; $j++) { |
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$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]); |
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$l = $c[$j]; |
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} |
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} |
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$m.= $c; |
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$length+= 16; |
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|
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// Step 3. Initialize MD Buffer |
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$x = str_repeat(chr(0), 48); |
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|
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// Step 4. Process Message in 16-Byte Blocks |
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for ($i = 0; $i < $length; $i+= 16) { |
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for ($j = 0; $j < 16; $j++) { |
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$x[$j + 16] = $m[$i + $j]; |
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$x[$j + 32] = $x[$j + 16] ^ $x[$j]; |
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} |
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$t = chr(0); |
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for ($j = 0; $j < 18; $j++) { |
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for ($k = 0; $k < 48; $k++) { |
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$x[$k] = $t = $x[$k] ^ chr($s[ord($t)]); |
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//$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]); |
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} |
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$t = chr(ord($t) + $j); |
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} |
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} |
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// Step 5. Output |
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return substr($x, 0, 16); |
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} |
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/** |
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* Pure-PHP implementation of SHA256 |
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* |
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* See {@link http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}. |
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* |
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* @access private |
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* @param String $text |
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*/ |
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function _sha256($m) |
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{ |
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if (extension_loaded('suhosin')) { |
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return pack('H*', sha256($m)); |
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} |
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// Initialize variables |
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$hash = array( |
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 |
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); |
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// Initialize table of round constants |
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// (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311) |
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static $k = array( |
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, |
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, |
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, |
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, |
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, |
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, |
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
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); |
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|
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// Pre-processing |
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$length = strlen($m); |
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// to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64 |
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$m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F)); |
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$m[$length] = chr(0x80); |
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// we don't support hashing strings 512MB long |
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$m.= pack('N2', 0, $length << 3); |
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|
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// Process the message in successive 512-bit chunks |
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$chunks = str_split($m, 64); |
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foreach ($chunks as $chunk) { |
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$w = array(); |
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for ($i = 0; $i < 16; $i++) { |
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extract(unpack('Ntemp', $this->_string_shift($chunk, 4))); |
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$w[] = $temp; |
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} |
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|
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// Extend the sixteen 32-bit words into sixty-four 32-bit words |
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for ($i = 16; $i < 64; $i++) { |
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$s0 = $this->_rightRotate($w[$i - 15], 7) ^ |
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$this->_rightRotate($w[$i - 15], 18) ^ |
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$this->_rightShift( $w[$i - 15], 3); |
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$s1 = $this->_rightRotate($w[$i - 2], 17) ^ |
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$this->_rightRotate($w[$i - 2], 19) ^ |
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$this->_rightShift( $w[$i - 2], 10); |
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$w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1); |
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|
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} |
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|
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// Initialize hash value for this chunk |
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list($a, $b, $c, $d, $e, $f, $g, $h) = $hash; |
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|
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// Main loop |
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for ($i = 0; $i < 64; $i++) { |
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$s0 = $this->_rightRotate($a, 2) ^ |
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$this->_rightRotate($a, 13) ^ |
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$this->_rightRotate($a, 22); |
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$maj = ($a & $b) ^ |
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($a & $c) ^ |
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($b & $c); |
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$t2 = $this->_add($s0, $maj); |
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|
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$s1 = $this->_rightRotate($e, 6) ^ |
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$this->_rightRotate($e, 11) ^ |
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$this->_rightRotate($e, 25); |
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$ch = ($e & $f) ^ |
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($this->_not($e) & $g); |
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$t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]); |
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|
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$h = $g; |
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$g = $f; |
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$f = $e; |
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$e = $this->_add($d, $t1); |
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$d = $c; |
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$c = $b; |
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$b = $a; |
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$a = $this->_add($t1, $t2); |
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} |
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|
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// Add this chunk's hash to result so far |
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$hash = array( |
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$this->_add($hash[0], $a), |
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$this->_add($hash[1], $b), |
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$this->_add($hash[2], $c), |
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$this->_add($hash[3], $d), |
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$this->_add($hash[4], $e), |
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$this->_add($hash[5], $f), |
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$this->_add($hash[6], $g), |
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$this->_add($hash[7], $h) |
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); |
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} |
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|
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// Produce the final hash value (big-endian) |
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return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]); |
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} |
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|
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/** |
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* Pure-PHP implementation of SHA384 and SHA512 |
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* |
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* @access private |
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* @param String $text |
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*/ |
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function _sha512($m) |
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{ |
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if (!class_exists('Math_BigInteger')) { |
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require_once('Math/BigInteger.php'); |
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} |
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|
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static $init384, $init512, $k; |
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|
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if (!isset($k)) { |
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// Initialize variables |
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$init384 = array( // initial values for SHA384 |
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'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939', |
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'67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4' |
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); |
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$init512 = array( // initial values for SHA512 |
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'6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1', |
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'510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179' |
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); |
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|
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for ($i = 0; $i < 8; $i++) { |
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$init384[$i] = new Math_BigInteger($init384[$i], 16); |
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$init384[$i]->setPrecision(64); |
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$init512[$i] = new Math_BigInteger($init512[$i], 16); |
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$init512[$i]->setPrecision(64); |
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} |
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|
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// Initialize table of round constants |
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// (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409) |
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$k = array( |
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'428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc', |
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'3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118', |
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'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2', |
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'72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694', |
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'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65', |
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'2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5', |
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'983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4', |
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'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70', |
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'27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df', |
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'650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b', |
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'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30', |
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'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8', |
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'19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8', |
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'391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3', |
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'748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec', |
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'90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b', |
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'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178', |
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'06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b', |
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'28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c', |
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'4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817' |
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); |
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for ($i = 0; $i < 80; $i++) { |
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$k[$i] = new Math_BigInteger($k[$i], 16); |
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} |
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} |
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|
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$hash = $this->l == 48 ? $init384 : $init512; |
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|
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// Pre-processing |
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$length = strlen($m); |
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// to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128 |
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$m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F)); |
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$m[$length] = chr(0x80); |
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// we don't support hashing strings 512MB long |
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$m.= pack('N4', 0, 0, 0, $length << 3); |
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|
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// Process the message in successive 1024-bit chunks |
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$chunks = str_split($m, 128); |
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foreach ($chunks as $chunk) { |
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$w = array(); |
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for ($i = 0; $i < 16; $i++) { |
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$temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256); |
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$temp->setPrecision(64); |
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$w[] = $temp; |
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} |
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// Extend the sixteen 32-bit words into eighty 32-bit words |
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for ($i = 16; $i < 80; $i++) { |
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$temp = array( |
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$w[$i - 15]->bitwise_rightRotate(1), |
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$w[$i - 15]->bitwise_rightRotate(8), |
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$w[$i - 15]->bitwise_rightShift(7) |
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); |
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$s0 = $temp[0]->bitwise_xor($temp[1]); |
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$s0 = $s0->bitwise_xor($temp[2]); |
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$temp = array( |
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$w[$i - 2]->bitwise_rightRotate(19), |
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$w[$i - 2]->bitwise_rightRotate(61), |
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$w[$i - 2]->bitwise_rightShift(6) |
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); |
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$s1 = $temp[0]->bitwise_xor($temp[1]); |
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$s1 = $s1->bitwise_xor($temp[2]); |
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$w[$i] = $w[$i - 16]->copy(); |
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$w[$i] = $w[$i]->add($s0); |
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$w[$i] = $w[$i]->add($w[$i - 7]); |
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$w[$i] = $w[$i]->add($s1); |
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} |
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// Initialize hash value for this chunk |
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$a = $hash[0]->copy(); |
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$b = $hash[1]->copy(); |
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$c = $hash[2]->copy(); |
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$d = $hash[3]->copy(); |
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$e = $hash[4]->copy(); |
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$f = $hash[5]->copy(); |
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$g = $hash[6]->copy(); |
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$h = $hash[7]->copy(); |
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|
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// Main loop |
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for ($i = 0; $i < 80; $i++) { |
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$temp = array( |
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$a->bitwise_rightRotate(28), |
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$a->bitwise_rightRotate(34), |
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$a->bitwise_rightRotate(39) |
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); |
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$s0 = $temp[0]->bitwise_xor($temp[1]); |
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$s0 = $s0->bitwise_xor($temp[2]); |
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$temp = array( |
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$a->bitwise_and($b), |
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$a->bitwise_and($c), |
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$b->bitwise_and($c) |
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); |
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$maj = $temp[0]->bitwise_xor($temp[1]); |
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$maj = $maj->bitwise_xor($temp[2]); |
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$t2 = $s0->add($maj); |
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|
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$temp = array( |
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$e->bitwise_rightRotate(14), |
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$e->bitwise_rightRotate(18), |
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$e->bitwise_rightRotate(41) |
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); |
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$s1 = $temp[0]->bitwise_xor($temp[1]); |
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$s1 = $s1->bitwise_xor($temp[2]); |
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$temp = array( |
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$e->bitwise_and($f), |
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$g->bitwise_and($e->bitwise_not()) |
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); |
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$ch = $temp[0]->bitwise_xor($temp[1]); |
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$t1 = $h->add($s1); |
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$t1 = $t1->add($ch); |
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$t1 = $t1->add($k[$i]); |
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$t1 = $t1->add($w[$i]); |
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|
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$h = $g->copy(); |
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$g = $f->copy(); |
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$f = $e->copy(); |
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$e = $d->add($t1); |
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$d = $c->copy(); |
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$c = $b->copy(); |
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$b = $a->copy(); |
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$a = $t1->add($t2); |
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} |
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// Add this chunk's hash to result so far |
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$hash = array( |
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$hash[0]->add($a), |
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$hash[1]->add($b), |
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$hash[2]->add($c), |
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$hash[3]->add($d), |
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$hash[4]->add($e), |
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$hash[5]->add($f), |
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$hash[6]->add($g), |
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$hash[7]->add($h) |
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); |
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} |
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// Produce the final hash value (big-endian) |
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// (Crypt_Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here) |
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$temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() . |
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$hash[4]->toBytes() . $hash[5]->toBytes(); |
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if ($this->l != 48) { |
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$temp.= $hash[6]->toBytes() . $hash[7]->toBytes(); |
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} |
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return $temp; |
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} |
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|
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/** |
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* Right Rotate |
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* |
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* @access private |
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* @param Integer $int |
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* @param Integer $amt |
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* @see _sha256() |
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* @return Integer |
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*/ |
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function _rightRotate($int, $amt) |
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{ |
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$invamt = 32 - $amt; |
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$mask = (1 << $invamt) - 1; |
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return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask); |
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} |
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/** |
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* Right Shift |
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* |
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* @access private |
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* @param Integer $int |
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* @param Integer $amt |
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* @see _sha256() |
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* @return Integer |
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*/ |
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function _rightShift($int, $amt) |
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{ |
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$mask = (1 << (32 - $amt)) - 1; |
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return ($int >> $amt) & $mask; |
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} |
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|
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/** |
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* Not |
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* |
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* @access private |
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* @param Integer $int |
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* @see _sha256() |
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* @return Integer |
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*/ |
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function _not($int) |
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{ |
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return ~$int & 0xFFFFFFFF; |
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} |
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|
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/** |
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* Add |
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* |
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* _sha256() adds multiple unsigned 32-bit integers. Since PHP doesn't support unsigned integers and since the |
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* possibility of overflow exists, care has to be taken. Math_BigInteger() could be used but this should be faster. |
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* |
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* @param String $string |
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* @param optional Integer $index |
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* @return String |
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* @see _sha256() |
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* @access private |
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*/ |
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function _add() |
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{ |
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static $mod; |
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if (!isset($mod)) { |
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$mod = pow(2, 32); |
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} |
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$result = 0; |
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$arguments = func_get_args(); |
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foreach ($arguments as $argument) { |
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$result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument; |
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} |
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return fmod($result, $mod); |
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} |
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|
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/** |
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* String Shift |
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* |
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* Inspired by array_shift |
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* |
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* @param String $string |
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* @param optional Integer $index |
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* @return String |
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* @access private |
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*/ |
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function _string_shift(&$string, $index = 1) |
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{ |
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$substr = substr($string, 0, $index); |
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$string = substr($string, $index); |
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return $substr; |
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} |
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} |