using System;

using System.Collections.Generic;

using System.Security.Cryptography;

using System.Text;

using System.Linq;

using Newtonsoft.Json; 

​

public class SaveData

{

    public string nimi { get; set; }

    public int rahaa { get; set; }

    public int timantteja { get; set; }

    public int voittoja { get; set; }

    public int tappioita { get; set; }

    public ulong todiste { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        SaveData sd = new SaveData()

        {

            nimi = "dragon 666",

            rahaa = 300,

            timantteja = 30,

            voittoja = 13,

            tappioita = 3,

        };

        SaveData sd1 = FindSuitable(sd);

        string json = JsonConvert.SerializeObject(sd1);

        Console.WriteLine(json);

        Console.WriteLine(SHA1(json));

    }

    private static string GenerateHashString(HashAlgorithm algo, string text)

    {

        // Compute hash from text parameter

        algo.ComputeHash(Encoding.UTF8.GetBytes(text));

​

        // Get has value in array of bytes

        var result = algo.Hash;

​

        // Return as hexadecimal string

        return string.Join(

            string.Empty,

            result.Select(x => x.ToString("X2")));

    }

    private static SaveData FindSuitable(SaveData input)

    {

        string startMatchToSeek = "000";

        input.todiste = 0;

        string result = SHA1(JsonConvert.SerializeObject(input));

        while (!result.StartsWith(startMatchToSeek))

        {

            input.todiste++;

            result = SHA1(JsonConvert.SerializeObject(input));

        }

        return input;

    }

    public static string SHA1(string text)

    {

        var result = default(string);

​

        using (var algo = new SHA1Managed())

        {

            result = GenerateHashString(algo, text);

        }

​

        return result;

    }

​

}