creation de cle rsa

bonjour je cherche un script javascript qui me permetterai de genere des cle publique selon une taille precise . comme sur cette page (sauf que c est en java , moi je m y connnait pas en java) http://www.bibmath.net/crypto/moderne/rsa.php3 voici la source: import java.applet.Applet; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.math.BigInteger; import java.util.Random; public class makecle extends Applet implements ActionListener { public void init() { setBackground(Color.white); texte = new Label("Taille de la cl\351 (en bits) :"); area = new TextField(4); area.setText("50"); aff = new TextArea(8, 60); bouton = new Button("Fabriquer!"); bouton.setBackground(Color.orange); bouton.addActionListener(this); aff.setEditable(false); aff.setForeground(Color.red); add(texte); add(area); add(bouton); add(aff); } public void actionPerformed(ActionEvent actionevent) { AlertPanel alertpanel; try { Integer integer = new Integer(area.getText()); Random random = new Random(); BigInteger biginteger1 = new BigInteger(integer.intValue() / 2, 100, random); BigInteger biginteger2 = new BigInteger(integer.intValue() / 2, 100, random); BigInteger biginteger4 = biginteger1.multiply(biginteger2); biginteger1 = biginteger1.subtract(new BigInteger("1")); biginteger2 = biginteger2.subtract(new BigInteger("1")); BigInteger biginteger = biginteger1.multiply(biginteger2); BigInteger biginteger5 = new BigInteger("3"); for(BigInteger biginteger6 = biginteger5.gcd(biginteger); biginteger6.compareTo(new BigInteger("1")) != 0; biginteger6 = biginteger5.gcd(biginteger)) biginteger5 = biginteger5.add(new BigInteger("1")); BigInteger biginteger9 = biginteger; BigInteger biginteger14 = biginteger9; BigInteger biginteger8 = biginteger5; BigInteger biginteger10 = new BigInteger("1"); BigInteger biginteger13 = new BigInteger("0"); BigInteger biginteger11 = new BigInteger("0"); BigInteger biginteger7; for(BigInteger biginteger12 = new BigInteger("1"); biginteger8.compareTo(new BigInteger("0")) != 0; biginteger12 = biginteger7.subtract(biginteger12)) { BigInteger biginteger3 = biginteger9.divide(biginteger8); biginteger7 = biginteger9; biginteger9 = biginteger8; biginteger8 = biginteger8.multiply(biginteger3); biginteger8 = biginteger7.subtract(biginteger8); biginteger7 = biginteger10; biginteger10 = biginteger13; biginteger13 = biginteger13.multiply(biginteger3); biginteger13 = biginteger7.subtract(biginteger13); biginteger7 = biginteger11; biginteger11 = biginteger12; biginteger12 = biginteger12.multiply(biginteger3); } String s = new String("Cl\351 publique :\nn=" + biginteger4.toString() + "\n" + "e=" + biginteger5.toString() + "\nCl\351 priv\351e :\nn=" + biginteger4.toString() + "\n" + "d=" + biginteger11.toString()); aff.setText(s); return; } catch(NumberFormatException _ex) { alertpanel = new AlertPanel("Format du nombre incorrect!"); } } public String getAppletInfo() { return "Fabrication de cl\351s RSA - Fr\351d\351ric Bayart"; } public String[][] getParameterInfo() { return null; } public makecle() { isStandalone = false; } boolean isStandalone; Label texte; TextField area; TextArea aff; Button bouton; }