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/Classes/PHPExcel/Reader/Excel5/MD5.php

https://github.com/DOTOCA/PHPExcel
PHP | 221 lines | 138 code | 30 blank | 53 comment | 0 complexity | 08b8e282b7f69f8e0eb52d03afb366cf MD5 | raw file
  1<?php
  2/**
  3 * PHPExcel
  4 *
  5 * Copyright (c) 2006 - 2014 PHPExcel
  6 *
  7 * This library is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU Lesser General Public
  9 * License as published by the Free Software Foundation; either
 10 * version 2.1 of the License, or (at your option) any later version.
 11 *
 12 * This library is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15 * Lesser General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU Lesser General Public
 18 * License along with this library; if not, write to the Free Software
 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 20 *
 21 * @category   PHPExcel
 22 * @package    PHPExcel_Reader_Excel5
 23 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 24 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt        LGPL
 25 * @version    ##VERSION##, ##DATE##
 26 */
 27
 28
 29/**
 30 * PHPExcel_Reader_Excel5_MD5
 31 *
 32 * @category        PHPExcel
 33 * @package                PHPExcel_Reader_Excel5
 34 * @copyright        Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 35 */
 36class PHPExcel_Reader_Excel5_MD5
 37{
 38    // Context
 39    private $a;
 40    private $b;
 41    private $c;
 42    private $d;
 43
 44
 45    /**
 46     * MD5 stream constructor
 47     */
 48    public function __construct()
 49    {
 50        $this->reset();
 51    }
 52
 53
 54    /**
 55     * Reset the MD5 stream context
 56     */
 57    public function reset()
 58    {
 59        $this->a = 0x67452301;
 60        $this->b = 0xEFCDAB89;
 61        $this->c = 0x98BADCFE;
 62        $this->d = 0x10325476;
 63    }
 64
 65
 66    /**
 67     * Get MD5 stream context
 68     * 
 69     * @return string
 70     */
 71    public function getContext()
 72    {
 73        $s = '';
 74        foreach (array('a', 'b', 'c', 'd') as $i) {
 75            $v = $this->{$i};
 76            $s .= chr($v & 0xff);
 77            $s .= chr(($v >> 8) & 0xff);
 78            $s .= chr(($v >> 16) & 0xff);
 79            $s .= chr(($v >> 24) & 0xff);
 80        }
 81
 82        return $s;
 83    }
 84
 85
 86    /**
 87     * Add data to context
 88     * 
 89     * @param string $data Data to add
 90     */
 91    public function add($data)
 92    {
 93        $words = array_values(unpack('V16', $data));
 94
 95        $A = $this->a;
 96        $B = $this->b;
 97        $C = $this->c;
 98        $D = $this->d;
 99
100        $F = array('PHPExcel_Reader_Excel5_MD5','F');
101        $G = array('PHPExcel_Reader_Excel5_MD5','G');
102        $H = array('PHPExcel_Reader_Excel5_MD5','H');
103        $I = array('PHPExcel_Reader_Excel5_MD5','I');
104
105        /* ROUND 1 */
106        self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
107        self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
108        self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
109        self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
110        self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
111        self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
112        self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
113        self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
114        self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
115        self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
116        self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
117        self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
118        self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
119        self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
120        self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
121        self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
122
123        /* ROUND 2 */
124        self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
125        self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
126        self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
127        self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
128        self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
129        self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453);
130        self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
131        self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
132        self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
133        self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
134        self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
135        self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
136        self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
137        self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
138        self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
139        self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
140
141        /* ROUND 3 */
142        self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
143        self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
144        self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
145        self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
146        self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
147        self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
148        self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
149        self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
150        self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
151        self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
152        self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
153        self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05);
154        self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
155        self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
156        self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
157        self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
158
159        /* ROUND 4 */
160        self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
161        self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
162        self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
163        self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
164        self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
165        self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
166        self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
167        self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
168        self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
169        self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
170        self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
171        self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
172        self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
173        self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
174        self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
175        self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
176
177        $this->a = ($this->a + $A) & 0xffffffff;
178        $this->b = ($this->b + $B) & 0xffffffff;
179        $this->c = ($this->c + $C) & 0xffffffff;
180        $this->d = ($this->d + $D) & 0xffffffff;
181    }
182
183
184    private static function F($X, $Y, $Z)
185    {
186        return (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
187    }
188
189
190    private static function G($X, $Y, $Z)
191    {
192        return (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
193    }
194
195
196    private static function H($X, $Y, $Z)
197    {
198        return ($X ^ $Y ^ $Z); // X XOR Y XOR Z
199    }
200
201
202    private static function I($X, $Y, $Z)
203    {
204        return ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
205    }
206
207
208    private static function step($func, &$A, $B, $C, $D, $M, $s, $t)
209    {
210        $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
211        $A = self::rotate($A, $s);
212        $A = ($B + $A) & 0xffffffff;
213    }
214
215
216    private static function rotate($decimal, $bits)
217    {
218        $binary = str_pad(decbin($decimal), 32, "0", STR_PAD_LEFT);
219        return bindec(substr($binary, $bits).substr($binary, 0, $bits));
220    }
221}