// Generate an authorization header.
public Windows.Web.Http.Headers.HttpCredentialsHeaderValue AuthorizationHeader(string method, DateTime now, HttpRequestMessage request, long contentLength, string ifMatch = "", string md5 = "")
{
string MessageSignature;
if (IsTableStorage)
{
MessageSignature = String.Format("{0}\n\n{1}\n{2}\n{3}",
method,
"application/atom+xml",
now.ToString("R", System.Globalization.CultureInfo.InvariantCulture),
GetCanonicalizedResource(request.RequestUri, StorageAccount)
);
}
else
{
MessageSignature = String.Format("{0}\n\n\n{1}\n{5}\n\n\n\n{2}\n\n\n\n{3}{4}",
method,
(method == "GET" || method == "HEAD") ? String.Empty : contentLength.ToString(),
ifMatch,
GetCanonicalizedHeaders(request),
GetCanonicalizedResource(request.RequestUri, StorageAccount),
md5
);
}
//Debug.WriteLine(MessageSignature);
var key = CryptographicBuffer.DecodeFromBase64String(StorageKey);
var msg = CryptographicBuffer.ConvertStringToBinary(MessageSignature, BinaryStringEncoding.Utf8);
MacAlgorithmProvider objMacProv = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256);
//CryptographicKey cryptKey = objMacProv.CreateKey(key);
//var buff = CryptographicEngine.Sign(cryptKey, msg);
CryptographicHash hash = objMacProv.CreateHash(key);
hash.Append(msg);
var authorizationHeader = new Windows.Web.Http.Headers.HttpCredentialsHeaderValue("SharedKey", StorageAccount + ":" + CryptographicBuffer.EncodeToBase64String(hash.GetValueAndReset()));
//Debug.WriteLine(authorizationHeader.ToString());
return authorizationHeader;
}