Encode shared key signature in Azure Storage Queue

Question

I'd like to use Azure storage REST api for queue, and in order to add the authentication infomation to the http header, I have to get the shared key.
From http://msdn.microsoft.com/en-us/library/azure/dd179428.aspx, I saw the string to sign like this:
I found it was very strange, I prefer it's C# code, and some place "\n" missed and so is "+", as I made up all stuffs, the authentication still failed, I do not know why, here is what I did:
using (var httpClient = new HttpClient())
var verb = "PUT";
var contentEncoding = "";
var contentLanguage = "";
var contentLenght = "0";
var contentMd5 = "";
var contentType = "text/plain; charset=utf-8";
var date = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
var ifModifiedSince = "";
var ifMatch = "";
var ifNoneMatch = "";
var ifUnmodifiedSince = "";
var range = "";
var canonicalizedHeaders = "";
var canonicalizedResource = "";
var stringToSign = verb + "\n" + contentEncoding + "\n" + contentLanguage + "\n" + contentLenght + "\n" +
contentMd5 + "\n" + contentType + "\n" + date + "\n" + ifModifiedSince + "\n" +
ifMatch + "\n" + ifNoneMatch + "\n" + ifUnmodifiedSince + "\n" + range + "\n" +
canonicalizedHeaders + "\n" + canonicalizedResource;
httpClient.BaseAddress = new Uri(string.Format("https://{0}.queue.core.windows.net", accountName));
httpClient.DefaultRequestHeaders.Clear();
httpClient.DefaultRequestHeaders.Add("Authorization", string.Format("SharedKey {0}:{1}", accountName, Hash(accountKey, stringToSign)));
httpClient.DefaultRequestHeaders.Add("x-ms-date", date);
var result = httpClient.PutAsync("myqueue", new StringContent(""));
result.Wait();
static string Hash(string message, string secret)
var messageBytes = Encoding.UTF8.GetBytes(message);
var secrectBytes = Encoding.UTF8.GetBytes(secret);
using (var hash = new HMACSHA256(secrectBytes))
var hashMessage = hash.ComputeHash(messageBytes);
return Convert.ToBase64String(hashMessage);
Anyone can help me?

Answer 1

Hi,
Please try this code, I tested it on my side, it works fine.
String accountName = "***";
String accountKey = "***+**";
String signature = "";
String requestMethod = "POST";
String urlPath = String.Format("{0}/messages", "inputtext");
String storageServiceVersion = "2012-02-12";
String dateInRfc1123Format = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
String messageText = String.Format(
"<QueueMessage><MessageText>{0}</MessageText></QueueMessage>", "test2");
UTF8Encoding utf8Encoding = new UTF8Encoding();
Byte[] messageContent = utf8Encoding.GetBytes(messageText);
Int32 messageLength = messageContent.Length;
String canonicalizedHeaders = String.Format(
"x-ms-date:{0}\nx-ms-version:{1}",
dateInRfc1123Format,
storageServiceVersion);
String canonicalizedResource = String.Format("/{0}/{1}", accountName, urlPath);
String stringToSign = String.Format(
"{0}\n\n\n{1}\n\n\n\n\n\n\n\n\n{2}\n{3}",
requestMethod,
messageLength,
canonicalizedHeaders,
canonicalizedResource);
using (HMACSHA256 hmacSha256 = new HMACSHA256(Convert.FromBase64String(accountKey)))
Byte[] dataToHmac = System.Text.Encoding.UTF8.GetBytes(stringToSign);
signature = Convert.ToBase64String(hmacSha256.ComputeHash(dataToHmac));
String authorizationHeader = String.Format(
CultureInfo.InvariantCulture,
"{0} {1}:{2}",
"SharedKey",
accountName,
signature
Uri uri = new Uri(string.Format("https://{0}.queue.core.windows.net/", accountName) + urlPath);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = requestMethod;
request.Headers.Add("x-ms-date", dateInRfc1123Format);
request.Headers.Add("x-ms-version", storageServiceVersion);
request.Headers.Add("Authorization", authorizationHeader);
request.ContentLength = messageLength;
using (Stream requestStream = request.GetRequestStream())
requestStream.Write(messageContent, 0, messageLength);
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
String requestId = response.Headers["x-ms-request-id"];
Also, you could see this page:http://convective.wordpress.com/2010/08/18/examples-of-the-windows-azure-storage-services-rest-api/
Regards,
Will
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