Hasher

Program.cs

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

namespace Hasher
{
    class Program
    {
        static void Main(string[] args)
        {
            if(args.Length != 1)
            {
                Console.WriteLine("Drop a file on the exe to get the hashes");
                return;
            }

            Console.WriteLine(args[0]);
            using(FileStream fs = new FileStream(args[0],FileMode.Open,FileAccess.Read))
            {
                using (MD5 md5 = new MD5Cng())
                {
                    string md5Hash = BitConverter.ToString(md5.ComputeHash(fs)).Replace("-", "").ToLower();
                    Console.WriteLine("MD5:{0}", md5Hash);
                }
                fs.Position = 0;
                using (SHA1 sha1 = new SHA1Cng())
                {
                    string sha1Hash = BitConverter.ToString(sha1.ComputeHash(fs)).Replace("-", "").ToLower();
                    Console.WriteLine("SHA1:{0}", sha1Hash);
                }
                fs.Position = 0;
                using (SHA256 sha256 = new SHA256Cng())
                {
                    string sha256Hash = BitConverter.ToString(sha256.ComputeHash(fs)).Replace("-", "").ToLower();
                    Console.WriteLine("SHA256:{0}", sha256Hash);
                }
            }
            Console.WriteLine("Done");
            Console.ReadLine();
        }
    }
}