ServiceStack.HmacUtils.Authenticate C# (CSharp) Метод

        public static byte[] Authenticate(byte[] encryptedBytes, byte[] authKey, byte[] iv)
        {
            using (var hmac = CreateHashAlgorithm(authKey))
            using (var ms = new MemoryStream())
            {
                using (var writer = new BinaryWriter(ms))
                {
                    //Prepend IV
                    writer.Write(iv);
                    //Write Ciphertext
                    writer.Write(encryptedBytes);
                    writer.Flush();

                    //Authenticate all data
                    var tag = hmac.ComputeHash(ms.ToArray());
                    //Postpend tag
                    writer.Write(tag);
                }
                return ms.ToArray();
            }
        }

        public EncryptedMessage CreateEncryptedMessage(object request, string operationName, byte[] cryptKey, byte[] authKey, byte[] iv, string verb = null)
        {
            this.PopulateRequestMetadata(request);

            if (verb == null)
            {
                verb = HttpMethods.Post;
            }

            var cryptAuthKeys = cryptKey.Combine(authKey);

            var rsaEncCryptAuthKeys     = RsaUtils.Encrypt(cryptAuthKeys, PublicKey);
            var authRsaEncCryptAuthKeys = HmacUtils.Authenticate(rsaEncCryptAuthKeys, authKey, iv);

            var timestamp   = DateTime.UtcNow.ToUnixTime();
            var requestBody = timestamp + " " + verb + " " + operationName + " " + request.ToJson();

            var encryptedBytes     = AesUtils.Encrypt(requestBody.ToUtf8Bytes(), cryptKey, iv);
            var authEncryptedBytes = HmacUtils.Authenticate(encryptedBytes, authKey, iv);

            var encryptedMessage = new EncryptedMessage
            {
                KeyId = KeyId,
                EncryptedSymmetricKey = Convert.ToBase64String(authRsaEncCryptAuthKeys),
                EncryptedBody         = Convert.ToBase64String(authEncryptedBytes),
            };

            return(encryptedMessage);
        }