public new void Sign <T>(IRequest <T> request, ICredentials credentials)
        {
            var sanitizedCredentials = this.SanitizeCredentials(credentials);
            var signerParams         = new SignerRequestParams <T>(request, this.regionName, this.serviceName, "SDK-HMAC-SHA256");

            this.AddHostHeader(request);
            request.AddHeader("X-Sdk-Date", signerParams.GetFormattedSigningDateTime());
            String contentSha256 = this.CalculateContentHash(request);

            /* Not support for now
             * String contentSha256 = this.calculateContentHash(request);
             * if ("required".equals(request.getHeaders().get("x-sdk-content-sha256")))
             * {
             *  request.addHeader("x-sdk-content-sha256", contentSha256);
             * }
             *
             * String canonicalRequest = this.createCanonicalRequest(request, contentSha256);
             * string stringToSign = this.CreateStringToSign(canonicalRequest, signerParams);
             * byte[] signingKey = this.deriveSigningKey(sanitizedCredentials, signerParams);
             * byte[] signature = this.computeSignature(stringToSign, signingKey, signerParams);
             */
            //byte[] signature = this.computeSignature(stringToSign, signingKey, signerParams);

            request.AddHeader("Authorization", this.BuildAuthorizationHeader(request, null, sanitizedCredentials, signerParams));
        }
        protected string CreateStringToSign <T>(string canonicalRequest, SignerRequestParams <T> signerParams)
        {
            var stringToSignBuilder = new StringBuilder(signerParams.GetSigningAlgorithm());

            stringToSignBuilder.Append("\n")
            .Append(signerParams.GetFormattedSigningDateTime())
            .Append("\n")
            .Append(signerParams.GetScope())
            .Append("\n")
            .Append(BinaryUtils.ToHex(this.Hash(canonicalRequest)));
            var stringToSign = stringToSignBuilder.ToString();

            return(stringToSign);
        }
        private string BuildAuthorizationHeader <T>(IRequest <T> request, byte[] signature, ICredentials credentials, SignerRequestParams <T> signerParams)
        {
            var signingCredentials = credentials.GetAccessKeyId() + "/" + signerParams.GetScope();
            var credential         = "Credential=" + signingCredentials;
            var signerHeaders      = "SignedHeaders=" + this.GetSignedHeadersString(request);
            var signatureHeader    = "Signature=" + BinaryUtils.ToHex(signature);
            var authHeaderBuilder  = new StringBuilder();

            authHeaderBuilder.Append("SDK-HMAC-SHA256")
            .Append(" ")
            .Append(credential)
            .Append(", ")
            .Append(signerHeaders)
            .Append(", ")
            .Append(signatureHeader);
            return(authHeaderBuilder.ToString());
        }