AES (Rijndael) Java class

[Cheeseball]

I am working on a chat client that using AES (Rijndael) in Java, I am needing to verify my "assumptions" for the specs on Rijndael. I have attached some source if anyone wants to take a look, it is not optimized (to any extent) and only gets about 1.7k throughput. I have only posted the class that is used to encrypt/decrypt data, no classes that actually use it.

In order to use it you will need to have a program create a new RijnCrypto object, then invoke the encrypt(String, String) method, to decrypt data you will need to call the decrypt(String, String) method. I have included a simple example main method.

	static int charsread;
	static char data[];		
	public static void main(String args[]) {
		RijnCrypto rijn = new RijnCrypto(128, 128);
		
		String filename = "test.txt";
		try {
			FileReader filereader = new FileReader(filename);
			data = new char[400000];
			
			charsread = filereader.read(data);
			
			filereader.close();
		} catch (Exception e) {
			System.out.println(e);
		}
		
		String d = new String(data, 0, charsread);

		double i;
		double j;
		System.out.println("Start crypt: ");

		i = System.currentTimeMillis();
		rijn.encrypt(d, "aaaaaaaaaaaaaaaa");
		j = System.currentTimeMillis();
		
		double x = j - i;
		System.out.println("Stop crypt, took: " + x + "ms");
	}

I am looking for flaws with the code itself, and it also makes a good reference piece for people who want to know how rijndael works.

Thanks

sourceforge.net/sicher