import javax.microedition.lcdui.Display;

import javax.microedition.lcdui.Form;

import javax.microedition.midlet.*;

 

public class Main extends MIDlet {

 

    public void startApp() {

        String s = "Текст", key = "Ключ";

        Form f = new Form("XOR");

        s = CryptXOR(s, key);

        f.append("Криптуем..n" + s);

        f.append("nДекриптуем..n" + CryptXOR(s, key));

        Display.getDisplay(this).setCurrent(f);

    }

 

    public void pauseApp() {

    }

 

    public void destroyApp(boolean unconditional) {

    }

 

    private String CryptXOR(String s, String k) {

        char[] buf = s.toCharArray(), key = k.toCharArray();

        for (int i = 0, a = 0; i < buf.length; i++, a++) {

            buf[i] = (char) (buf[i] ^ key[a]);

            if (a == key.length - 1) {

                a = 0;

            }

        }

        s = new String(buf);

        return s;

    }

}