DES-kryptering

Der er et ganske godt eksempel på, hvordan man kryptere en fil her:
http://msdn.microsoft.com/en-us/library/system.security.cryptography.des.aspx

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

public class MainClass
{
    private static Encoding utf = new UTF8Encoding();
    private static DES des = new DESCryptoServiceProvider();
    private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
    public static string Encrypt(string plain, string key)
    {
        ICryptoTransform encrypt = des.CreateEncryptor(utf.GetBytes(key), iv);
        return Convert.ToBase64String(encrypt.TransformFinalBlock(utf.GetBytes(plain), 0, utf.GetByteCount(plain)));
    }
    public static string Decrypt(string cipher, string key)
    {
        ICryptoTransform decrypt = des.CreateDecryptor(utf.GetBytes(key), iv);
        byte[] b = Convert.FromBase64String(cipher);
        return utf.GetString(decrypt.TransformFinalBlock(b, 0, b.Length));
    }
    public static void Main(string[] args)
    {
        Console.WriteLine(Encrypt("Dette er en test !", "hemmelig"));
        Console.WriteLine(Decrypt(Encrypt("Dette er en test !", "hemmelig"), "hemmelig"));
    }
}

Tak :) Bare smid et par svar.

svar

:-)