MD5

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input;
            if (args.Length == 0)
            {
                input = Console.ReadLine();
            }
            else
            {
                input = args[0];
            }

            MD5 md5 = MD5.Create();
            byte[] hash = md5.ComputeHash(Encoding.UTF8.GetBytes(input));

            string output = Convert.ToBase64String(hash);

            string writePath = "hash.txt";
            try
            {
                using (StreamWriter sw = new StreamWriter(writePath, false, Encoding.Default))
                {
                    sw.WriteLine(output);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}