PageRenderTime 47ms CodeModel.GetById 21ms RepoModel.GetById 1ms app.codeStats 0ms

/lib/phpexcel/PHPExcel/Reader/Excel5/MD5.php

http://github.com/moodle/moodle
PHP | 203 lines | 138 code | 19 blank | 46 comment | 0 complexity | d00b2a4aa7bb98d2b179a78b3120dec1 MD5 | raw file
Possible License(s): MIT, AGPL-3.0, MPL-2.0-no-copyleft-exception, LGPL-3.0, GPL-3.0, Apache-2.0, LGPL-2.1, BSD-3-Clause
  1. <?php
  2. /**
  3. * PHPExcel_Reader_Excel5_MD5
  4. *
  5. * Copyright (c) 2006 - 2015 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 - 2015 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. class PHPExcel_Reader_Excel5_MD5
  28. {
  29. // Context
  30. private $a;
  31. private $b;
  32. private $c;
  33. private $d;
  34. /**
  35. * MD5 stream constructor
  36. */
  37. public function __construct()
  38. {
  39. $this->reset();
  40. }
  41. /**
  42. * Reset the MD5 stream context
  43. */
  44. public function reset()
  45. {
  46. $this->a = 0x67452301;
  47. $this->b = 0xEFCDAB89;
  48. $this->c = 0x98BADCFE;
  49. $this->d = 0x10325476;
  50. }
  51. /**
  52. * Get MD5 stream context
  53. *
  54. * @return string
  55. */
  56. public function getContext()
  57. {
  58. $s = '';
  59. foreach (array('a', 'b', 'c', 'd') as $i) {
  60. $v = $this->{$i};
  61. $s .= chr($v & 0xff);
  62. $s .= chr(($v >> 8) & 0xff);
  63. $s .= chr(($v >> 16) & 0xff);
  64. $s .= chr(($v >> 24) & 0xff);
  65. }
  66. return $s;
  67. }
  68. /**
  69. * Add data to context
  70. *
  71. * @param string $data Data to add
  72. */
  73. public function add($data)
  74. {
  75. $words = array_values(unpack('V16', $data));
  76. $A = $this->a;
  77. $B = $this->b;
  78. $C = $this->c;
  79. $D = $this->d;
  80. $F = array('PHPExcel_Reader_Excel5_MD5','f');
  81. $G = array('PHPExcel_Reader_Excel5_MD5','g');
  82. $H = array('PHPExcel_Reader_Excel5_MD5','h');
  83. $I = array('PHPExcel_Reader_Excel5_MD5','i');
  84. /* ROUND 1 */
  85. self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
  86. self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
  87. self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
  88. self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
  89. self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
  90. self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
  91. self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
  92. self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
  93. self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
  94. self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
  95. self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
  96. self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
  97. self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
  98. self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
  99. self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
  100. self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
  101. /* ROUND 2 */
  102. self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
  103. self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
  104. self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
  105. self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
  106. self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
  107. self::step($G, $D, $A, $B, $C, $words[10], 9, 0x02441453);
  108. self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
  109. self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
  110. self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
  111. self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
  112. self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
  113. self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
  114. self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
  115. self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
  116. self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
  117. self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
  118. /* ROUND 3 */
  119. self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
  120. self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
  121. self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
  122. self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
  123. self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
  124. self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
  125. self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
  126. self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
  127. self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
  128. self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
  129. self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
  130. self::step($H, $B, $C, $D, $A, $words[6], 23, 0x04881d05);
  131. self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
  132. self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
  133. self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
  134. self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
  135. /* ROUND 4 */
  136. self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
  137. self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
  138. self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
  139. self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
  140. self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
  141. self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
  142. self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
  143. self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
  144. self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
  145. self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
  146. self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
  147. self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
  148. self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
  149. self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
  150. self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
  151. self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
  152. $this->a = ($this->a + $A) & 0xffffffff;
  153. $this->b = ($this->b + $B) & 0xffffffff;
  154. $this->c = ($this->c + $C) & 0xffffffff;
  155. $this->d = ($this->d + $D) & 0xffffffff;
  156. }
  157. private static function f($X, $Y, $Z)
  158. {
  159. return (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
  160. }
  161. private static function g($X, $Y, $Z)
  162. {
  163. return (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
  164. }
  165. private static function h($X, $Y, $Z)
  166. {
  167. return ($X ^ $Y ^ $Z); // X XOR Y XOR Z
  168. }
  169. private static function i($X, $Y, $Z)
  170. {
  171. return ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
  172. }
  173. private static function step($func, &$A, $B, $C, $D, $M, $s, $t)
  174. {
  175. $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
  176. $A = self::rotate($A, $s);
  177. $A = ($B + $A) & 0xffffffff;
  178. }
  179. private static function rotate($decimal, $bits)
  180. {
  181. $binary = str_pad(decbin($decimal), 32, "0", STR_PAD_LEFT);
  182. return bindec(substr($binary, $bits).substr($binary, 0, $bits));
  183. }
  184. }