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   1  <?php
   2  
   3  /**
   4   * PHPExcel_Reader_Excel5_MD5
   5   *
   6   * Copyright (c) 2006 - 2015 PHPExcel
   7   *
   8   * This library is free software; you can redistribute it and/or
   9   * modify it under the terms of the GNU Lesser General Public
  10   * License as published by the Free Software Foundation; either
  11   * version 2.1 of the License, or (at your option) any later version.
  12   *
  13   * This library is distributed in the hope that it will be useful,
  14   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16   * Lesser General Public License for more details.
  17   *
  18   * You should have received a copy of the GNU Lesser General Public
  19   * License along with this library; if not, write to the Free Software
  20   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  21   *
  22   * @category   PHPExcel
  23   * @package    PHPExcel_Reader_Excel5
  24   * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
  25   * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt        LGPL
  26   * @version    ##VERSION##, ##DATE##
  27   */
  28  class PHPExcel_Reader_Excel5_MD5
  29  {
  30      // Context
  31      private $a;
  32      private $b;
  33      private $c;
  34      private $d;
  35  
  36      /**
  37       * MD5 stream constructor
  38       */
  39      public function __construct()
  40      {
  41          $this->reset();
  42      }
  43  
  44      /**
  45       * Reset the MD5 stream context
  46       */
  47      public function reset()
  48      {
  49          $this->a = 0x67452301;
  50          $this->b = 0xEFCDAB89;
  51          $this->c = 0x98BADCFE;
  52          $this->d = 0x10325476;
  53      }
  54  
  55      /**
  56       * Get MD5 stream context
  57       *
  58       * @return string
  59       */
  60      public function getContext()
  61      {
  62          $s = '';
  63          foreach (array('a', 'b', 'c', 'd') as $i) {
  64              $v = $this->{$i};
  65              $s .= chr($v & 0xff);
  66              $s .= chr(($v >> 8) & 0xff);
  67              $s .= chr(($v >> 16) & 0xff);
  68              $s .= chr(($v >> 24) & 0xff);
  69          }
  70  
  71          return $s;
  72      }
  73  
  74      /**
  75       * Add data to context
  76       *
  77       * @param string $data Data to add
  78       */
  79      public function add($data)
  80      {
  81          $words = array_values(unpack('V16', $data));
  82  
  83          $A = $this->a;
  84          $B = $this->b;
  85          $C = $this->c;
  86          $D = $this->d;
  87  
  88          $F = array('PHPExcel_Reader_Excel5_MD5','f');
  89          $G = array('PHPExcel_Reader_Excel5_MD5','g');
  90          $H = array('PHPExcel_Reader_Excel5_MD5','h');
  91          $I = array('PHPExcel_Reader_Excel5_MD5','i');
  92  
  93          /* ROUND 1 */
  94          self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
  95          self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
  96          self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
  97          self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
  98          self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
  99          self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
 100          self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
 101          self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
 102          self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
 103          self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
 104          self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
 105          self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
 106          self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
 107          self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
 108          self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
 109          self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
 110  
 111          /* ROUND 2 */
 112          self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
 113          self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
 114          self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
 115          self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
 116          self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
 117          self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453);
 118          self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
 119          self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
 120          self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
 121          self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
 122          self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
 123          self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
 124          self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
 125          self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
 126          self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
 127          self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
 128  
 129          /* ROUND 3 */
 130          self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
 131          self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
 132          self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
 133          self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
 134          self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
 135          self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
 136          self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
 137          self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
 138          self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
 139          self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
 140          self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
 141          self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05);
 142          self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
 143          self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
 144          self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
 145          self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
 146  
 147          /* ROUND 4 */
 148          self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
 149          self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
 150          self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
 151          self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
 152          self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
 153          self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
 154          self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
 155          self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
 156          self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
 157          self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
 158          self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
 159          self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
 160          self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
 161          self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
 162          self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
 163          self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
 164  
 165          $this->a = ($this->a + $A) & 0xffffffff;
 166          $this->b = ($this->b + $B) & 0xffffffff;
 167          $this->c = ($this->c + $C) & 0xffffffff;
 168          $this->d = ($this->d + $D) & 0xffffffff;
 169      }
 170  
 171      private static function f($X, $Y, $Z)
 172      {
 173          return (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
 174      }
 175  
 176      private static function g($X, $Y, $Z)
 177      {
 178          return (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
 179      }
 180  
 181      private static function h($X, $Y, $Z)
 182      {
 183          return ($X ^ $Y ^ $Z); // X XOR Y XOR Z
 184      }
 185  
 186      private static function i($X, $Y, $Z)
 187      {
 188          return ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
 189      }
 190  
 191      private static function step($func, &$A, $B, $C, $D, $M, $s, $t)
 192      {
 193          $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
 194          $A = self::rotate($A, $s);
 195          $A = ($B + $A) & 0xffffffff;
 196      }
 197  
 198      private static function rotate($decimal, $bits)
 199      {
 200          $binary = str_pad(decbin($decimal), 32, "0", STR_PAD_LEFT);
 201          return bindec(substr($binary, $bits).substr($binary, 0, $bits));
 202      }
 203  }