using System;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        Console.Clear();

        string seed = "abcdef";

        int index = 0;

        bool hashFound = false;

        while (hashFound == false)

        {

            string hashTarget = seed + index.ToString();

            string hash = CreateMD5Hash(hashTarget);

            Console.WriteLine(hash);

            if (hash.StartsWith("00000"))

            {

                hashFound = true;

            }

        }

​

        Console.WriteLine(index);

    }

​

    public static string CreateMD5Hash(string input)

    {

        // Step 1, calculate MD5 hash from input

        MD5 md5 = System.Security.Cryptography.MD5.Create();

        byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);

        byte[] hashBytes = md5.ComputeHash(inputBytes);

        // Step 2, convert byte array to hex string

        StringBuilder sb = new StringBuilder();

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

        {

            sb.Append(hashBytes[i].ToString("X2"));

        }

​

        return sb.ToString();

    }

}