using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        String TextBox2 = "The quick brown fox jumped over the lazy dog"; //TextBox 2 contains the plain text

        String TextBox1; //TextBox1 contains the encrypted version

        RijndaelManaged aesAlg = new RijndaelManaged();

        aesAlg.GenerateKey();

        aesAlg.GenerateIV();

        var key = aesAlg.Key;

        var iv = aesAlg.IV;

        Console.WriteLine("Plaintext: "+TextBox2);

​

        // original bytes

        var bytesToEncrypt = new byte[TextBox2.Length * sizeof(char)];

        Console.WriteLine("Plaintext Bytes: "+CryptoAes.ByteArrayToStr(bytesToEncrypt));

        var encryptedBytes = CryptoAes.Encrypt(bytesToEncrypt, key, iv);

        Console.WriteLine("Encrypted Bytes: "+CryptoAes.ByteArrayToStr(encryptedBytes));

        TextBox1 = Convert.ToBase64String(encryptedBytes);

        Console.WriteLine("Encrypted: "+TextBox1);

​

        encryptedBytes = Convert.FromBase64String(TextBox1); 

        Console.WriteLine("Encrypted bytes: "+CryptoAes.ByteArrayToStr(encryptedBytes));

        var decryptedBytes = CryptoAes.Decrypt(encryptedBytes, key, iv);

        Console.WriteLine("Decrypted bytes: "+CryptoAes.ByteArrayToStr(decryptedBytes));    

        Console.WriteLine("Decrypted bytes length: "+decryptedBytes.Length);    

        String decryptedText = System.Text.Encoding.Unicode.GetString(decryptedBytes);

​

        Console.WriteLine("Decrypted: "+decryptedText);    

    }

}

​

internal sealed class CryptoAes

{

    public static byte[] Encrypt(byte[] data, byte[] key, byte[] iv)

    {

        byte[] encryptedData = null;

​

        if (data == null)

            throw new ArgumentNullException("data");

​

        if (data == key)

            throw new ArgumentNullException("key");

​

        if (data == iv)

            throw new ArgumentNullException("iv");

​

        using (RijndaelManaged aesAlg = new RijndaelManaged())

        {

            aesAlg.Key = key;

            aesAlg.IV = iv;

            aesAlg.Padding = PaddingMode.Zeros;

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

            encryptedData = encryptor.TransformFinalBlock(data, 0, data.Length);

        }

​

        return encryptedData;

    }

​

    public static byte[] Decrypt(byte[] data, byte[] key, byte[] iv)

    {

        byte[] decryptedData = null;

​

        if (data == null)

            throw new ArgumentNullException("data");

​

        if (data == key)

            throw new ArgumentNullException("key");

​

        if (data == iv)

            throw new ArgumentNullException("iv");

​

        using (RijndaelManaged aesAlg = new RijndaelManaged())

        {

            aesAlg.Key = key;

            aesAlg.IV = iv;

            aesAlg.Padding = PaddingMode.Zeros;

            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

            decryptedData = decryptor.TransformFinalBlock(data, 0, data.Length);

​

        }

​

        return decryptedData;

    }

    public static String ByteArrayToStr(byte[] data)

    {

        String s = "";

        foreach (Byte b in data)

        {

            s = s + b.ToString()+", ";

        }

        s = s+"  ("+data.Length+" bytes)";

        return s;

    }

}