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/application/third_party/PHPExcel/Shared/PasswordHasher.php

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PHP | 67 lines | 19 code | 5 blank | 43 comment | 0 complexity | 8189343cfcdea1c31e228e69e4008a68 MD5 | raw file
  1. <?php
  2. /**
  3. * PHPExcel
  4. *
  5. * Copyright (c) 2006 - 2012 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_Shared
  23. * @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
  24. * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
  25. * @version 1.7.8, 2012-10-12
  26. */
  27. /**
  28. * PHPExcel_Shared_PasswordHasher
  29. *
  30. * @category PHPExcel
  31. * @package PHPExcel_Shared
  32. * @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
  33. */
  34. class PHPExcel_Shared_PasswordHasher
  35. {
  36. /**
  37. * Create a password hash from a given string.
  38. *
  39. * This method is based on the algorithm provided by
  40. * Daniel Rentz of OpenOffice and the PEAR package
  41. * Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
  42. *
  43. * @param string $pPassword Password to hash
  44. * @return string Hashed password
  45. */
  46. public static function hashPassword($pPassword = '') {
  47. $password = 0x0000;
  48. $i = 1; // char position
  49. // split the plain text password in its component characters
  50. $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
  51. foreach ($chars as $char) {
  52. $value = ord($char) << $i; // shifted ASCII value
  53. $rotated_bits = $value >> 15; // rotated bits beyond bit 15
  54. $value &= 0x7fff; // first 15 bits
  55. $password ^= ($value | $rotated_bits);
  56. ++$i;
  57. }
  58. $password ^= strlen($pPassword);
  59. $password ^= 0xCE4B;
  60. return(strtoupper(dechex($password)));
  61. }
  62. }