using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string username = "test";

        string password = "1234";

​

        string original = username + password;

        original = original.PadLeft(32, '0').Substring(0, 32);

        byte[] Key = Encoding.UTF8.GetBytes(original);

        byte[] VI = new byte[16];

        for(int i = 0; i < 16; i++)

        {

            VI[i] = Key[Key.Length - 1 - i];

        }

        using (Aes myAes = Aes.Create())

        {

            byte[] encrypted = EncryptStringToBytes_Aes(original, Key, VI);

            Console.WriteLine("byte[] encrypted = new byte[] { " + string.Join(",", encrypted) + " };");

        }

    }

    static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)

    {

        byte[] encrypted;

​

        using (Aes aesAlg = Aes.Create())

        {

            aesAlg.Key = Key;

            aesAlg.IV = IV;

​

            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

​

            using (MemoryStream msEncrypt = new MemoryStream())

            {

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

                {

                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                    {

                        swEncrypt.Write(plainText);

                    }

                    encrypted = msEncrypt.ToArray();

                }

            }

        }

​

        return encrypted;

    }

}