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2388 jpm 1
<?php
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/**
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 * PHPExcel
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 *
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 * Copyright (c) 2006 - 2013 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 - 2013 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    ##VERSION##, ##DATE##
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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 - 2013 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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        $charPos	= 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) << $charPos++;	// 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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        }
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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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}