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   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   */
  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  }