Md5 uwp

        public static string Md5(string str)
        {
            HashAlgorithmProvider hashAlgorithm =
                 HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Md5);

            CryptographicHash cryptographic = hashAlgorithm.CreateHash();

            IBuffer buffer = CryptographicBuffer.ConvertStringToBinary(str, BinaryStringEncoding.Utf8);

            cryptographic.Append(buffer);

            return CryptographicBuffer.EncodeToHexString(cryptographic.GetValueAndReset());
        }