<?php
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/**
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* PHPExcel
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*
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* Copyright (c) 2006 - 2012 PHPExcel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @category PHPExcel
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* @package PHPExcel_Shared
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version 1.7.7, 2012-05-19
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*/
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/**
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* PHPExcel_Shared_PasswordHasher
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*
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* @category PHPExcel
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* @package PHPExcel_Shared
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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*/
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class PHPExcel_Shared_PasswordHasher
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{
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/**
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* Create a password hash from a given string.
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*
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* This method is based on the algorithm provided by
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* Daniel Rentz of OpenOffice and the PEAR package
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* Spreadsheet_Excel_Writer by Xavier Noguer <xnoguer@rezebra.com>.
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*
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* @param string $pPassword Password to hash
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* @return string Hashed password
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*/
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public static function hashPassword($pPassword = '') {
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$password = 0x0000;
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$i = 1; // char position
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// split the plain text password in its component characters
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$chars = preg_split('//', $pPassword, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($chars as $char) {
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$value = ord($char) << $i; // shifted ASCII value
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$rotated_bits = $value >> 15; // rotated bits beyond bit 15
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$value &= 0x7fff; // first 15 bits
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$password ^= ($value | $rotated_bits);
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++$i;
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}
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$password ^= strlen($pPassword);
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$password ^= 0xCE4B;
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return(strtoupper(dechex($password)));
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}
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}
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