Source for file PasswordHasher.php
Documentation is available at PasswordHasher.php
* Copyright (c) 2006 - 2011 PHPExcel * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * @package PHPExcel_Shared * @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version 1.7.6, 2011-02-27 * PHPExcel_Shared_PasswordHasher * @package PHPExcel_Shared * @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel) * Create a password hash from a given string. * This method is based on the algorithm provided by * Daniel Rentz of OpenOffice and the PEAR package * Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>. * @param string $pPassword Password to hash * @return string Hashed password // split the plain text password in its component characters $chars = preg_split('//', $pPassword, - 1, PREG_SPLIT_NO_EMPTY); foreach ($chars as $char) { $value = ord($char) << $i; // shifted ASCII value $rotated_bits = $value >> 15; // rotated bits beyond bit 15 $value &= 0x7fff; // first 15 bits $password ^= ($value | $rotated_bits); $password ^= strlen($pPassword);
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