stringToSign := getStringToSignV2(method, encodedResource, encodedQuery, headers, expires)
	return calculateSignatureV2(stringToSign, cred.SecretKey)
}

// Return the signature v2 of a given request.
func signatureV2(cred auth.Credentials, method string, encodedResource string, encodedQuery string, headers http.Header) string {
	stringToSign := getStringToSignV2(method, encodedResource, encodedQuery, headers, "")

			encodedQuery = splits[1]
		}
	}

	unescapedQueries, err := unescapeQueries(encodedQuery)
	if err != nil {
		return err
	}

	// Get presigned string to sign.
	stringToSign := getStringToSignV2(req.Method, encodedResource, strings.Join(unescapedQueries, "&"), req.Header, expiresStr)
	hm := hmac.New(sha1.New, []byte(secretAccessKey))
	hm.Write([]byte(stringToSign))

	// Calculate signature.