using System;

public class Program

{

    public static void Main()

    {

        Program p = new Program();

        var utcdate =DateTime.UtcNow;

        var ClientID = "250";

        var Password = "Re0R%0Fd";

        Console.WriteLine("Client_ID: "+ ClientID);

        Console.WriteLine("x-token: " + p.GetXTokenHeader(utcdate,ClientID, Password));

        //UTCTimestamp in Header

        Console.WriteLine("UTCTimestamp: "+ utcdate.ToString("yyyy-MM-ddTHH:mm:ss.fff"));

    }

​

    private string GetXTokenHeader(DateTime utcdate, string ClientID, string Password)

    {

        //UTCTimestamp in Sha512 Hash

        var date = utcdate.ToString("yyyy-MM-ddHHmmss");

        var data = date+ ClientID + Password;

        return SHA512(data);

    }

​

    private string SHA512(string input)

    {

        var bytes = System.Text.Encoding.UTF8.GetBytes(input);

        using (var hash = System.Security.Cryptography.SHA512.Create())

        {

        var hashedInputBytes = hash.ComputeHash(bytes);

​

         // Convert to text

        // StringBuilder Capacity is 128, because 512 bits / 8 bits in byte * 2 symbols for byte

        var hashedInputStringBuilder = new System.Text.StringBuilder(128);

        foreach (var b in hashedInputBytes)

        hashedInputStringBuilder.Append(b.ToString("x2"));

        return hashedInputStringBuilder.ToString();

​

        }

    }

}

​