How to encrypt in C# and decrypt in Apex

public class Program

{

private static byte[] cryptkey = Encoding.ASCII.GetBytes("01234567890123456789abcdefabcdef");

private static byte[] initVector = Encoding.ASCII.GetBytes("0123456789012359");

public static void Main()

{

var testo1 = "test";

var testo2 = "pippo\n";

string value = CryptAES(testo1);

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

Console.WriteLine("Crittare '{0}' produce: {1}", testo2, CryptAES(testo2));

Console.ReadLine();

}

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;

}

}

}