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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
Possible License(s): LGPL-2.0, LGPL-2.1
  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. * PHPExcel_Reader_Excel5_MD5
  29. *
  30. * @category PHPExcel
  31. * @package PHPExcel_Reader_Excel5
  32. * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
  33. */
  34. class PHPExcel_Reader_Excel5_MD5
  35. {
  36. // Context
  37. private $a;
  38. private $b;
  39. private $c;
  40. private $d;
  41. /**
  42. * MD5 stream constructor
  43. */
  44. public function __construct()
  45. {
  46. $this->reset();
  47. }
  48. /**
  49. * Reset the MD5 stream context
  50. */
  51. public function reset()
  52. {
  53. $this->a = 0x67452301;
  54. $this->b = 0xEFCDAB89;
  55. $this->c = 0x98BADCFE;
  56. $this->d = 0x10325476;
  57. }
  58. /**
  59. * Get MD5 stream context
  60. *
  61. * @return string
  62. */
  63. public function getContext()
  64. {
  65. $s = '';
  66. foreach (array('a', 'b', 'c', 'd') as $i) {
  67. $v = $this->{$i};
  68. $s .= chr($v & 0xff);
  69. $s .= chr(($v >> 8) & 0xff);
  70. $s .= chr(($v >> 16) & 0xff);
  71. $s .= chr(($v >> 24) & 0xff);
  72. }
  73. return $s;
  74. }
  75. /**
  76. * Add data to context
  77. *
  78. * @param string $data Data to add
  79. */
  80. public function add($data)
  81. {
  82. $words = array_values(unpack('V16', $data));
  83. $A = $this->a;
  84. $B = $this->b;
  85. $C = $this->c;
  86. $D = $this->d;
  87. $F = array('PHPExcel_Reader_Excel5_MD5','F');
  88. $G = array('PHPExcel_Reader_Excel5_MD5','G');
  89. $H = array('PHPExcel_Reader_Excel5_MD5','H');
  90. $I = array('PHPExcel_Reader_Excel5_MD5','I');
  91. /* ROUND 1 */
  92. self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
  93. self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
  94. self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
  95. self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
  96. self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
  97. self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
  98. self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
  99. self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
  100. self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
  101. self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
  102. self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
  103. self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
  104. self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
  105. self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
  106. self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
  107. self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
  108. /* ROUND 2 */
  109. self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
  110. self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
  111. self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
  112. self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
  113. self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
  114. self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453);
  115. self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
  116. self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
  117. self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
  118. self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
  119. self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
  120. self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
  121. self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
  122. self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
  123. self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
  124. self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
  125. /* ROUND 3 */
  126. self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
  127. self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
  128. self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
  129. self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
  130. self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
  131. self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
  132. self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
  133. self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
  134. self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
  135. self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
  136. self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
  137. self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05);
  138. self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
  139. self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
  140. self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
  141. self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
  142. /* ROUND 4 */
  143. self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
  144. self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
  145. self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
  146. self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
  147. self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
  148. self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
  149. self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
  150. self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
  151. self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
  152. self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
  153. self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
  154. self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
  155. self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
  156. self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
  157. self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
  158. self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
  159. $this->a = ($this->a + $A) & 0xffffffff;
  160. $this->b = ($this->b + $B) & 0xffffffff;
  161. $this->c = ($this->c + $C) & 0xffffffff;
  162. $this->d = ($this->d + $D) & 0xffffffff;
  163. }
  164. private static function F($X, $Y, $Z)
  165. {
  166. return (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
  167. }
  168. private static function G($X, $Y, $Z)
  169. {
  170. return (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
  171. }
  172. private static function H($X, $Y, $Z)
  173. {
  174. return ($X ^ $Y ^ $Z); // X XOR Y XOR Z
  175. }
  176. private static function I($X, $Y, $Z)
  177. {
  178. return ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
  179. }
  180. private static function step($func, &$A, $B, $C, $D, $M, $s, $t)
  181. {
  182. $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
  183. $A = self::rotate($A, $s);
  184. $A = ($B + $A) & 0xffffffff;
  185. }
  186. private static function rotate($decimal, $bits)
  187. {
  188. $binary = str_pad(decbin($decimal), 32, "0", STR_PAD_LEFT);
  189. return bindec(substr($binary, $bits).substr($binary, 0, $bits));
  190. }
  191. }