public string GetStringToSign(CredentialScope scope, HttpRequestMessage request)
{
#region Preconditions
if (scope == null)
{
throw new ArgumentNullException(nameof(scope));
}
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
#endregion
IEnumerable <string> dateHeaderValues;
if (!request.Headers.TryGetValues("x-amz-date", out dateHeaderValues))
{
throw new Exception("Missing x-amz-date header");
}
var timestamp = dateHeaderValues.First();
var canonicalRequest = HexString.FromBytes(ComputeSHA256(GetCanonicalRequest(request)));
return(string.Join("\n",
"AWS4-HMAC-SHA256", // Algorithm + \n
timestamp, // Timestamp + \n
scope.ToString(), // Scope + \n
canonicalRequest // Hex(SHA256(CanonicalRequest))
));
}
public static string GetStringToSign(
CredentialScope scope,
string timestamp,
string canonicalRequest)
{
#region Preconditions
if (scope == null)
{
throw new ArgumentNullException(nameof(scope));
}
if (timestamp == null)
{
throw new ArgumentNullException(nameof(timestamp));
}
if (canonicalRequest == null)
{
throw new ArgumentNullException(nameof(canonicalRequest));
}
#endregion
var hashedCanonicalRequest = HexString.FromBytes(ComputeSHA256(canonicalRequest));
return(string.Join("\n",
"AWS4-HMAC-SHA256", // Algorithm + \n
timestamp, // Timestamp + \n
scope.ToString(), // Scope + \n
hashedCanonicalRequest // Hex(SHA256(CanonicalRequest))
));
}
public static string GetStringToSign(CredentialScope scope, string timestamp, string canonicalRequest)
{
string hashedCanonicalRequest = HexString.FromBytes(ComputeSHA256(canonicalRequest));
var sb = StringBuilderCache.Aquire();
sb.AppendJoin('\n', new string[] {
algorithmName, // Algorithm + \n
timestamp, // Timestamp + \n
scope.ToString(), // Scope + \n
hashedCanonicalRequest // Hex(SHA256(CanonicalRequest))
});
return(StringBuilderCache.ExtractAndRelease(sb));
}