Template:Json API HMAC Block- CSharp

      public void setHmacHeaders(HttpWebRequest request)
       {
           string applicationId = "vendor-id";
           string applicationPassword = "vendor-password";
           string apiSecret = "vendor-private-secret-key"; 
 
           // Create the date string
           String timestampString = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss (zzz)");
  
           // Build authentication string
           string message = applicationId + ":" + applicationPassword + ":" + timestampString; 
 
           // Create the athentication hash
           string auth = "HMAC " + hmacSha1ToBase64(message, apiSecret);  //space after HMAC is intentional
 
           // Set the request headers
           request.Headers.Add("updox-timestamp", timestampString);
           request.Headers.Add("Authorization", auth);
       }
 
       public string hmacSha1ToBase64(String value, String key)
       {
           // Get an hmac_sha1 key from the raw key bytes
           byte[] keyBytes = Encoding.UTF8.GetBytes(key);
           byte[] valueBytes = Encoding.UTF8.GetBytes(value);
               
             
           // Get an hmac_sha1 Mac instance and initialize with the signing key
           HMACSHA1 myhmacsha1 = new HMACSHA1();
 
           myhmacsha1.Key = keyBytes;
 
           byte[] final = myhmacsha1.ComputeHash(valueBytes);
 
           // Covert array of Hex bytes to a String
           return Convert.ToBase64String(final);
       }