using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        string uri = string.Format("/api/carrier/order/{0}/status", 148); 

        string url = string.Format("https://printea.getprintbox.com{0}",uri);

        string json = "{\"statusId\":4}";

​

        string apiKey = "7iP5hPz18T.U5EY0M74H_2on9FT,6lDF";

        string time = string.Format("{0:s}-{1}", DateTime.Now, "06:00");

        string elHash = sha256(json);

        string text = string.Format("{0}\ntime:{1}\nrequestUri:{2}\n{3}", "POST",time, uri ,elHash);

​

        var aux = hmacSHA256(text, apiKey);

        string signature = System.Convert.ToBase64String(aux);

        Console.WriteLine(json);

        Console.WriteLine(time);

        Console.WriteLine(text);

        Console.WriteLine(signature);

    }

    public static string sha256(string text)

    {

        using (SHA256 sha256Hash = SHA256.Create())

        {

            byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(text));

​

            StringBuilder builder = new StringBuilder();

            for (int i = 0; i < bytes.Length; i++)

            {

                builder.Append(bytes[i].ToString("x2"));

            }

​

            return builder.ToString();

        }  

    }

    public static byte[] hmacSHA256(string text, string apiKey)

    {

        var encoding = new ASCIIEncoding();

        byte[] textByte = encoding.GetBytes(text);

        byte[] apiKeyByte = encoding.GetBytes(apiKey);

        var hash = new HMACSHA256(apiKeyByte);

        return hash.ComputeHash(textByte);

    }

}