private function _round($input, $key, $hashPassword, $iv = null)
    {
        $bin = DataConverter::rawToBin($this->_encrypt($input . $key, $hashPassword, $iv));

        return substr($bin, -1 * $this->sideSize);
    }
private function _round($input, $key, $hashPassword, $iv = null)
    {
        $bin = DataConverter::rawToBin($this->_encrypt($input . $key, $hashPassword, $iv));

        return substr($bin, -1 * $this->sideSize);
    }
private function _round ( $ input , $ key , $ hashPassword , $ iv = null ) { $ bin = DataConverter :: rawToBin ( $ this -> _encrypt ( $ input . $ key , $ hashPassword , $ iv ) ) ; return substr ( $ bin , - 1 * $ this -> sideSize ) ; }
Round function helper.

@param string      $input
@param string      $key
@param string      $hashPassword
@param string|null $iv

@return string Binary string.
Round function helper .