PasswordHasher.php

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<?php
class PHPExcel_Shared_PasswordHasher
{
        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)));
        }
}