IO input = new IO();
/AESMatrix cipher = machine.encrypt(new AESMatrix(plain), new AESMatrix(key));

while (i < args.length && args[i].startsWith("-")) {
 arg = args[i++];
 if (arg.equals("-e")) {
                 System.out.println("encryption mode on");
        }
 else if (arg.equals("-d")) {
                System.out.println("decryption mode on");
        }
 else if (arg.equals("-plaintext")) {
  input.openPlaintext();
 }
 else if (arg.equals("-keytext")) {
  input.openKeytext();
 }
}