<?php

/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2015 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
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */


/**
 * PHPExcel_Shared_PasswordHasher
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Shared_PasswordHasher
{
    /**
     * 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    $pPassword    Password to hash
     * @return     string                Hashed password
     */
    public static function hashPassword($pPassword = '')
    {
        $password = 0x0000;
        $charPos  = 1;       // char position

        // 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) << $charPos++;    // shifted ASCII value
            $rotated_bits = $value >> 15;                // rotated bits beyond bit 15
            $value &= 0x7fff;                    // first 15 bits
            $password ^= ($value | $rotated_bits);
        }

        $password ^= strlen($pPassword);
        $password ^= 0xCE4B;

        return(strtoupper(dechex($password)));
    }
}
