try {
// Step 1: Alice generates a key pair
KeyPairGenerator kpg = KeyPairGenerator.getInstance("DH");
kpg.initialize(1024);
KeyPair kp = kpg.generateKeyPair();
// Step 2: Alice sends the public key and the
// Diffie-Hellman key parameters to Bob
Class dhClass = Class.forName(
"javax.crypto.spec.DHParameterSpec");
DHParameterSpec dhSpec = (
(DHPublicKey) kp.getPublic()).getParams();
aliceG = dhSpec.getG();
aliceP = dhSpec.getP();
aliceL = dhSpec.getL();
alice = kp.getPublic().getEncoded();
notify();
// Step 4 part 1: Alice performs the first phase of the
// protocol with her private key
KeyAgreement ka = KeyAgreement.getInstance("DH");
ka.init(kp.getPrivate());
// Step 4 part 2: Alice performs the second phase of the
// protocol with Bob
