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203 lines
7.8 KiB
203 lines
7.8 KiB
<?php
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/**
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* PHPExcel_Reader_Excel5_MD5
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*
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* Copyright (c) 2006 - 2015 PHPExcel
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*
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @category PHPExcel
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* @package PHPExcel_Reader_Excel5
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* @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version ##VERSION##, ##DATE##
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*/
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class PHPExcel_Reader_Excel5_MD5
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{
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// Context
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private $a;
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private $b;
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private $c;
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private $d;
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/**
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* MD5 stream constructor
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*/
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public function __construct()
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{
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$this->reset();
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}
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/**
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* Reset the MD5 stream context
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*/
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public function reset()
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{
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$this->a = 0x67452301;
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$this->b = 0xEFCDAB89;
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$this->c = 0x98BADCFE;
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$this->d = 0x10325476;
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}
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/**
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* Get MD5 stream context
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*
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* @return string
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*/
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public function getContext()
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{
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$s = '';
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foreach (array('a', 'b', 'c', 'd') as $i) {
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$v = $this->{$i};
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$s .= chr($v & 0xff);
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$s .= chr(($v >> 8) & 0xff);
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$s .= chr(($v >> 16) & 0xff);
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$s .= chr(($v >> 24) & 0xff);
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}
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return $s;
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}
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/**
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* Add data to context
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*
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* @param string $data Data to add
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*/
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public function add($data)
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{
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$words = array_values(unpack('V16', $data));
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$A = $this->a;
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$B = $this->b;
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$C = $this->c;
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$D = $this->d;
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$F = array('PHPExcel_Reader_Excel5_MD5','f');
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$G = array('PHPExcel_Reader_Excel5_MD5','g');
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$H = array('PHPExcel_Reader_Excel5_MD5','h');
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$I = array('PHPExcel_Reader_Excel5_MD5','i');
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/* ROUND 1 */
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self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
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self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
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self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
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self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
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self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
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self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
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self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
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self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
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self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
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self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
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self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
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self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
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self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
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self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
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self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
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self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
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/* ROUND 2 */
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self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
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self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
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self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
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self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
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self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
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self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453);
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self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
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self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
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self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
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self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
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self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
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self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
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self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
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self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
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self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
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self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
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/* ROUND 3 */
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self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
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self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
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self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
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self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
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self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
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self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
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self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
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self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
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self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
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self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
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self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
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self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05);
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self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
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self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
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self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
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self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
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/* ROUND 4 */
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self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
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self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
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self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
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self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
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self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
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self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
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self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
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self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
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self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
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self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
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self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
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self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
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self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
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self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
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self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
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self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
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$this->a = ($this->a + $A) & 0xffffffff;
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$this->b = ($this->b + $B) & 0xffffffff;
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$this->c = ($this->c + $C) & 0xffffffff;
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$this->d = ($this->d + $D) & 0xffffffff;
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}
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private static function f($X, $Y, $Z)
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{
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return (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
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}
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private static function g($X, $Y, $Z)
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{
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return (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
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}
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private static function h($X, $Y, $Z)
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{
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return ($X ^ $Y ^ $Z); // X XOR Y XOR Z
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}
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private static function i($X, $Y, $Z)
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{
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return ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
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}
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private static function step($func, &$A, $B, $C, $D, $M, $s, $t)
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{
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$A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
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$A = self::rotate($A, $s);
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$A = ($B + $A) & 0xffffffff;
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}
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private static function rotate($decimal, $bits)
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{
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$binary = str_pad(decbin($decimal), 32, "0", STR_PAD_LEFT);
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return bindec(substr($binary, $bits).substr($binary, 0, $bits));
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}
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}
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