using System;

using System.Security.Cryptography;

using System.Text;

using System.Web;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string requestContentBase64String = string.Empty;

        string APPId = "4d53bce03ec34c0a911182d4c228ee6c";

        string APIKey = "A93reRTUJHsCuQSHR+L3GxqOJyDmQpCgps102ciuabc=";

        DateTime epochStart = new DateTime(1970, 01, 01, 0, 0, 0, 0, DateTimeKind.Utc);

        TimeSpan timeSpan = DateTime.UtcNow - epochStart;

        string requestTimeStamp = Convert.ToUInt64(timeSpan.TotalSeconds).ToString();

        string requestUri = HttpUtility.UrlEncode("https://hrcdev.crothall.com/HRCAjax/DOM/StateEngineWebSite/StateEngineWebService.asmx");

        string nonce = Guid.NewGuid().ToString("N");

        string methodType = "POST"; //methodType: GET/POST

        string methodToExecute = "ListBuildingsByFacilityId";

         nonce = "42ee5e72c3cf4f3691c7d4da0279b04a";

      requestTimeStamp = "1467673877";

        Console.WriteLine("Nonce : " + nonce);

        Console.WriteLine("RequestTimeStamp : " + requestTimeStamp);

        string key = String.Format("{0}{1}{2}{3}{4}{5}", APPId, methodType, requestUri, requestTimeStamp, nonce, methodToExecute);

        var encoding = new System.Text.ASCIIEncoding();

        byte[] content = encoding.GetBytes(key);

        MD5 md5 = MD5.Create();

        byte[] requestContentHash = md5.ComputeHash(content);

        requestContentBase64String = Convert.ToBase64String(requestContentHash);

Console.WriteLine("requestContentBase64String : " + requestContentBase64String);

        string signatureRawData = String.Format("{0}{1}{2}{3}{4}{5}", APPId, methodType, requestUri, requestTimeStamp, nonce, requestContentBase64String);

        var secretKeyByteArray = Convert.FromBase64String(APIKey);

        byte[] signature = Encoding.UTF8.GetBytes(signatureRawData);

​

        using (HMACSHA256 hmac = new HMACSHA256(secretKeyByteArray))

        {

            byte[] signatureBytes = hmac.ComputeHash(signature);

            string requestSignatureBase64String = Convert.ToBase64String(signatureBytes);

            Console.WriteLine("Token : " + requestSignatureBase64String);

            Console.WriteLine("Token Pass Format -> " + string.Format("{0}:{1}:{2}:{3}:{4}:{5}", APPId, requestSignatureBase64String, nonce, requestTimeStamp, methodType, requestUri));

        }

    }

}