using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string input = "TIMEZONE=GMT&SESSIONSTART=20100510213400&MEMBERID=11223344";

        string key = "CABA61EC0BC04CA227BC44974E50C7DA";

        string iv = "31278672231278786312267778672313";

        byte[] b_key = StringToByteArray(key);

        byte[] b_iv = StringToByteArray(iv);

        byte[] encrypted = null;

        using (RijndaelManaged myRijndael = new RijndaelManaged())

        {

            myRijndael.IV = b_iv;

            myRijndael.Key = b_key;

            ICryptoTransform encryptor = myRijndael.CreateEncryptor(b_key, b_iv);

            using (MemoryStream msEncrypt = new MemoryStream())

            {

                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                {

                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                    {

                        swEncrypt.Write(input);

                    }

​

                    encrypted = msEncrypt.ToArray();

                }

            }

​

            Console.WriteLine("Input:   {0}", input);

            Console.WriteLine("Encrypted: {0}", ByteArrayToString(encrypted));

        }

    }

​

    public static byte[] StringToByteArray(String hex)

    {

        int NumberChars = hex.Length;

        byte[] bytes = new byte[NumberChars / 2];

        for (int i = 0; i < NumberChars; i += 2)

            bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);

        return bytes;

    }

​

    public static string ByteArrayToString(byte[] ba)

    {

        StringBuilder hex = new StringBuilder(ba.Length * 2);

        foreach (byte b in ba)

            hex.AppendFormat("{0:x2}", b);

        return hex.ToString();

    }

}