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    1.8.0, 2014-03-02
 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:  */
 36: class 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: }