public class KeyGenApplet extends JApplet implements ActionListener {
private final JButton createButton = new JButton("Create");
public void init(){
    createButton.addActionListener(this);
    this.add(createButton);
}
public void actionPerformed(ActionEvent e){
    if(e.getSource().equals(createButton)){
        Runnable test = new Runnable() { public void run(){
                keygen();}
        };
        Thread t = new Thread(test);
        t.start();
    }
}
private static void keygen(){
    try {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("GOST3410EL");
        KeyPair pair = kpg.generateKeyPair();
        System.out.println("OK");
    } catch (Exception e) {}
}
}