public string FinalString()
        {
            var hash = new byte[16];

            _digest.DoFinal(hash, 0);
            return(BitConverter.ToString(hash).Replace("-", "").ToLower());
        }
        public static byte[] GetMd5Bytes(byte[] data)
        {
            var digest = new Md5Digest();

            digest.BlockUpdate(data, 0, data.Length);
            var hash = new byte[16];

            digest.DoFinal(hash, 0);

            return(hash);
        }