using System;
using System.Security.Cryptography;
using System.Text;
public class Program
{
public static void Main()
var encoding = new ASCIIEncoding();
var secret = "testServiceNow";
var stringToHash = "testuser@mastercontrol.com";
byte[] secretBytes = encoding.GetBytes(secret);
byte[] stringToHashBytes = encoding.GetBytes(stringToHash);
using (var hmacsha1 = new HMACSHA1(secretBytes))
byte[] hashedBytes = hmacsha1.ComputeHash(stringToHashBytes);
Console.WriteLine(Convert.ToBase64String(hashedBytes));
}