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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_Shared
  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_Shared_PasswordHasher
  31   *
  32   * @category   PHPExcel
  33   * @package    PHPExcel_Shared
  34   * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
  35   */
  36  class PHPExcel_Shared_PasswordHasher
  37  {
  38      /**
  39       * Create a password hash from a given string.
  40       *
  41       * This method is based on the algorithm provided by
  42       * Daniel Rentz of OpenOffice and the PEAR package
  43       * Spreadsheet_Excel_Writer by Xavier Noguer <[email protected]>.
  44       *
  45       * @param     string    $pPassword    Password to hash
  46       * @return     string                Hashed password
  47       */
  48  	public static function hashPassword($pPassword = '') {
  49          $password    = 0x0000;
  50          $charPos    = 1;       // char position
  51  
  52          // split the plain text password in its component characters
  53          $chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
  54          foreach ($chars as $char) {
  55              $value            = ord($char) << $charPos++;    // shifted ASCII value
  56              $rotated_bits    = $value >> 15;                // rotated bits beyond bit 15
  57              $value            &= 0x7fff;                    // first 15 bits
  58              $password        ^= ($value | $rotated_bits);
  59          }
  60  
  61          $password ^= strlen($pPassword);
  62          $password ^= 0xCE4B;
  63  
  64          return(strtoupper(dechex($password)));
  65      }
  66  }