using System;

using System.Web;

using System.Security.Cryptography;

using System.Text;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string queueUrl = "https://johantest.servicebus.windows.net/" + "mytestqueue" + "/messages";

        string token = GetSasToken(queueUrl,"skicka", "jHRsNAvuXKz3dXjbE1LbvuO/omDUw7TQTqUxGrfkB7U=", TimeSpan.FromDays(1));

        Console.WriteLine(token);

    }

    public static string GetSasToken(string resourceUri, string keyName, string key, TimeSpan ttl)

        {

      var expiry = GetExpiry(ttl);

      string stringToSign = HttpUtility.UrlEncode(resourceUri) + "\n" + expiry;

      HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key));

      var signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));

      var sasToken = String.Format(CultureInfo.InvariantCulture, "SharedAccessSignature sr={0}&sig={1}&se={2}&skn={3}",

      HttpUtility.UrlEncode(resourceUri), HttpUtility.UrlEncode(signature), expiry, keyName);

      return sasToken;

    }   

​

    private static string GetExpiry(TimeSpan ttl)

    {

        TimeSpan expirySinceEpoch = DateTime.UtcNow - new DateTime(1970, 1, 1) + ttl;

        return Convert.ToString((int)expirySinceEpoch.TotalSeconds);

    }

​

}