using System;

using System.Text;

using System.Security.Cryptography;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    //132C75DBA1006E483B3B3F601533AD4D

    public static void Main()

    {

        string input = "$080tomy";

        Hash("Unicode", input, Encoding.Unicode);

        Hash("Unicode big-endian", input, Encoding.BigEndianUnicode);

        Hash("UTF-8", input, Encoding.UTF8);                        

        Hash("Unicode custom", input, new UnicodeEncoding(true, false));    // bigendian, bom

        byte[] data;

        Console.WriteLine();

        Console.WriteLine("utf-16");

        data = Encoding.BigEndianUnicode.GetBytes(input);   

        Console.WriteLine(BytesToHex(Encoding.BigEndianUnicode.GetPreamble()));

        Console.WriteLine(BytesToHex(data));

        ///////////

        Console.WriteLine();

        Console.WriteLine("from CF utf-16");

        data = HexToBytes("FEFF00240030003800300074006F006D0079");                      

        Console.WriteLine(Encoding.BigEndianUnicode.GetString(data));

        Console.WriteLine();

        Console.WriteLine("Final Solution");

        byte[] mydata = Encoding.BigEndianUnicode.GetPreamble().Concat(Encoding.BigEndianUnicode.GetBytes(input)).ToArray();

        using (MD5 md5Hash2 = MD5.Create())

        {

            byte[] myhash = md5Hash2.ComputeHash(mydata);

            Console.WriteLine("HEX: {0}", BytesToHex(myhash));

            Console.WriteLine("BASE64: {0}", Convert.ToBase64String(myhash));

        }

​

    }

    private static void Hash(string mthod, string input, Encoding encoding)

    {

        Console.WriteLine();

        Console.WriteLine(mthod);

        using (MD5 md5Hash = MD5.Create())

        {

            byte[] data = md5Hash.ComputeHash(encoding.GetBytes(input));

            Console.WriteLine("HEX: {0}", BytesToHex(data));

            Console.WriteLine("BASE64: {0}", Convert.ToBase64String(data));

        }

    }

    private static string BytesToHex(byte[] bytes)

    {

        StringBuilder sb = new StringBuilder();

        foreach(byte b in bytes)

            sb.AppendFormat("{0:X2}", b);

        return sb.ToString();

    }

    private static byte[] HexToBytes(string hex)

    {

        List<byte> buff = new List<byte>();

        for(int i = 0; i < hex.Length; i+= 2)

            buff.Add(Byte.Parse(hex.Substring(i, 2), System.Globalization.NumberStyles.HexNumber));

        return buff.ToArray();

    }

}