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/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
29/**
30 * PHPExcel_Shared_PasswordHasher
31 *
32 * @category   PHPExcel
33 * @package    PHPExcel_Shared
34 * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
35 */
36class 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 <xnoguer@rezebra.com>.
44	 *
45	 * @param 	string	$pPassword	Password to hash
46	 * @return 	string				Hashed password
47	 */
48	public static function hashPassword($pPassword = '') {
49        $password = 0x0000;
50        $i        = 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) << $i;   // shifted ASCII value
56            $rotated_bits = $value >> 15;       // rotated bits beyond bit 15
57            $value       &= 0x7fff;             // first 15 bits
58            $password    ^= ($value | $rotated_bits);
59            ++$i;
60        }
61
62        $password ^= strlen($pPassword);
63        $password ^= 0xCE4B;
64
65        return(strtoupper(dechex($password)));
66	}
67}