using System.Linq;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    static string getAuthorizationHeader(string eventSlug, string method, string url, string user, string password, string body)

    {

        string passHash = sha256(eventSlug + password);

        string authKey = sha256(user + passHash);

        string hmacHash = CalcHMACSHA256Hash(method + url + body, authKey);

        return "mobLee " + EncodeTo64(user + ":" + hmacHash);

    }

​

    static string sha256(string randomString)

    {

        var crypt = new System.Security.Cryptography.SHA256Managed();

        var hash = new System.Text.StringBuilder();

        byte[] crypto = crypt.ComputeHash(Encoding.UTF8.GetBytes(randomString));

        foreach (byte theByte in crypto)

        {

            hash.Append(theByte.ToString("x2"));

        }

​

        return hash.ToString();

    }

​

    private static string CalcHMACSHA256Hash(string plaintext, string salt)

    {

        string result = "";

        var enc = Encoding.Default;

        byte[] baText2BeHashed = enc.GetBytes(plaintext), baSalt = enc.GetBytes(salt);

        System.Security.Cryptography.HMACSHA256 hasher = new HMACSHA256(baSalt);

        byte[] baHashedText = hasher.ComputeHash(baText2BeHashed);

        result = string.Join("", baHashedText.ToList().Select(b => b.ToString("x2")).ToArray());

        return result;

    }

​

    static public string EncodeTo64(string toEncode)

    {

        byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);

        string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);

        return returnValue;

    }

}