using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

public class Program

{

     private static byte[] cryptkey = Encoding.ASCII.GetBytes("97e638565b8244128e10077c8baba66e");

        private static byte[] initVector = Encoding.ASCII.GetBytes("79ff9b5616b427da");

​

    public static void Main()

    {

        var testo1 = "402373020729280368505/20";

        Console.WriteLine("Crittare '{0}' produce: {1}", testo1, CryptAES(testo1));

    }

        public static string DecryptAES(string cipherData)

        {

            try

            {

                using (var rijndaelManaged =

                       new RijndaelManaged { Key = cryptkey, IV = initVector, Mode = CipherMode.CBC })

                using (var memoryStream =

                       new MemoryStream(Convert.FromBase64String(cipherData)))

                using (var cryptoStream =

                       new CryptoStream(memoryStream,

                           rijndaelManaged.CreateDecryptor(cryptkey, initVector),

                           CryptoStreamMode.Read))

                {

                    return new StreamReader(cryptoStream).ReadToEnd();

                }

            }

            catch (CryptographicException e)

            {

                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);

                return null;

            }

        }

​

​

        public static string CryptAES(string textToCrypt)

        {

            try

            {

                using (var rijndaelManaged =

                       new RijndaelManaged { Key = cryptkey, IV = initVector, Mode = CipherMode.CBC })

                using (var memoryStream = new MemoryStream())

                using (var cryptoStream =

                       new CryptoStream(memoryStream,

                           rijndaelManaged.CreateEncryptor(cryptkey, initVector),

                           CryptoStreamMode.Write))

                {

                    using (var ws = new StreamWriter(cryptoStream))

                    {

                        ws.Write(textToCrypt);

                    }

                    return Convert.ToBase64String(memoryStream.ToArray());

                }

            }

            catch (CryptographicException e)

            {

                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);

                return null;

            }

        }

​

}