using System;
using System.Text;
using System.Security.Cryptography;
 
public class Test
{
	public static void Main()
	{
		RijndaelManaged aes = new RijndaelManaged();
 
		string key = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
		byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
	    aes.Key = keyArray;
	    aes.Mode = CipherMode.ECB;
	    aes.Padding = PaddingMode.Zeros;
	    Console.WriteLine(BitConverter.ToString(aes.Key));
	    aes.KeySize = 256;
	    aes.BlockSize = 128;
		Console.WriteLine(BitConverter.ToString(aes.Key));
	}
}

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