/** Generate a Diffie-Hellman keypair of the specified size. */
DHCrypt(int keyLength, SecureRandom random) {
try {
KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("DiffieHellman");
kpg.initialize(keyLength, random);
KeyPair kp = kpg.generateKeyPair();
privateKey = kp.getPrivate();
DHPublicKeySpec spec = getDHPublicKeySpec(kp.getPublic());
publicValue = spec.getY();
modulus = spec.getP();
base = spec.getG();
} catch (GeneralSecurityException e) {
throw new RuntimeException("Could not generate DH keypair", e);
}
}
/**
* Generate a Diffie-Hellman keypair using the specified parameters.
*
* @param modulus the Diffie-Hellman modulus P
* @param base the Diffie-Hellman base G
*/
DHCrypt(BigInteger modulus, BigInteger base, SecureRandom random) {
this.modulus = modulus;
this.base = base;
try {
KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("DiffieHellman");
DHParameterSpec params = new DHParameterSpec(modulus, base);
kpg.initialize(params, random);
KeyPair kp = kpg.generateKeyPair();
privateKey = kp.getPrivate();
DHPublicKeySpec spec = getDHPublicKeySpec(kp.getPublic());
publicValue = spec.getY();
} catch (GeneralSecurityException e) {
throw new RuntimeException("Could not generate DH keypair", e);
}
}