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

public class main
{
   public static void Main(string[] args)
   {

     byte[] key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                   0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
     byte[] IV;

    string original = "This is a test.";

    ASCIIEncoding textConverter = new ASCIIEncoding();
    RijndaelManaged myRijndael = new RijndaelManaged();
    byte[] encrypted;
    byte[] toEncrypt;
    byte[] encLen;

    myRijndael.Mode = CipherMode.CBC;
    //Create a new initialization vector.
    myRijndael.GenerateIV();
    IV = myRijndael.IV;

    //Get an encryptor.
    ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, IV);
    
    //Encrypt the data.
    MemoryStream msEncrypt = new MemoryStream();

    // I'm using base64 encoding
    CryptoStream b64 = new CryptoStream(msEncrypt, 
        new ToBase64Transform(), CryptoStreamMode.Write);

    b64.Write(IV, 0, IV.Length); // Write IV before encryption
    CryptoStream csEncrypt = new CryptoStream(b64, 
          encryptor, CryptoStreamMode.Write);

    //Convert the data to a byte array.
    toEncrypt = textConverter.GetBytes(original);

    // Get the string length and convert to bytes in network order
    encLen = BitConverter.GetBytes(
        IPAddress.HostToNetworkOrder(toEncrypt.Length));
    csEncrypt.Write(encLen, 0, encLen.Length);

    //Write all data to the crypto stream and flush it.
    csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
    csEncrypt.FlushFinalBlock();

    //Get encrypted array of bytes.
    encrypted = msEncrypt.ToArray();

    // Here we write to console, but of course you
    // may want to include it in an XML response
    Console.WriteLine(textConverter.GetString(encrypted));
  }
}