AES Cryptography Sample

Aes.cs

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

class Program
{
    static void Main(string[] args)
    {
        string iv, key;
        const string msg = "Hello world!";
        byte[] buffer;

        using (var aes = new AesManaged())
        {
            aes.GenerateIV();
            aes.GenerateKey();

            iv = Convert.ToBase64String(aes.IV);
            key = Convert.ToBase64String(aes.Key);

            using (var enc = aes.CreateEncryptor())
            {
                buffer = Encoding.ASCII.GetBytes(msg);
                buffer = enc.TransformFinalBlock(buffer, 0, buffer.Length);
            }
        }

        using (var aes = new AesManaged())
        {
            aes.IV = Convert.FromBase64String(iv);
            aes.Key = Convert.FromBase64String(key);

            using (var dec = aes.CreateDecryptor())
            {
                buffer = dec.TransformFinalBlock(buffer, 0, buffer.Length);
                Debug.Assert(Encoding.ASCII.GetString(buffer) == msg);
            }
        }
    }
}