'crc-32' => str_pad(dechex(ord($file['crc-32'][3])), 2, '0', STR_PAD_LEFT).
                str_pad(dechex(ord($file['crc-32'][2])), 2, '0', STR_PAD_LEFT).
                str_pad(dechex(ord($file['crc-32'][1])), 2, '0', STR_PAD_LEFT).
                str_pad(dechex(ord($file['crc-32'][0])), 2, '0', STR_PAD_LEFT),