net.sourceforge.jcetaglib.lib
Class DHKeyAgreement

java.lang.Object
  net.sourceforge.jcetaglib.lib.DHKeyAgreement

public class DHKeyAgreement

extends java.lang.Object

Diffie-Hellman key agreement

Version:

$Id: DHKeyAgreement.java,v 1.3 2004/04/15 07:28:25 hamgert Exp $

Author:

Gert Van Ham, hamgert@users.sourceforge.net, http://jcetaglib.sourceforge.net

Constructor Summary

DHKeyAgreement()

Method Summary

static java.security.PublicKey	bytesToPublicKey(byte[] keyBytes) convert byte representation of a public key to a PublicKey object
static java.security.KeyPair	generateDHKeyPair() Generate DH keypair based on SKIP Modulus
static java.security.Key	generateSessionKey(java.security.PublicKey pubkey, java.security.PrivateKey privkey, java.lang.String algorithm, int length) Create session key from DH keypair
static byte[]	publicKeyToBytes(java.security.PublicKey pub) get a byte presentation of a PublicKey object

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DHKeyAgreement

public DHKeyAgreement()

Method Detail

generateDHKeyPair

public static java.security.KeyPair generateDHKeyPair()
                                               throws java.security.NoSuchAlgorithmException,
                                                      java.security.NoSuchProviderException,
                                                      java.security.InvalidAlgorithmParameterException

Generate DH keypair based on SKIP Modulus

Returns:

DH keypair

Throws:

java.security.NoSuchAlgorithmException - unknown algorithm

java.security.NoSuchProviderException - unknown provider

java.security.InvalidAlgorithmParameterException

generateSessionKey

public static java.security.Key generateSessionKey(java.security.PublicKey pubkey,
                                                   java.security.PrivateKey privkey,
                                                   java.lang.String algorithm,
                                                   int length)
                                            throws java.security.NoSuchAlgorithmException,
                                                   java.security.InvalidKeyException

Create session key from DH keypair

Parameters:

pubkey - public key other party

privkey - own private key

algorithm - block cipher algorithm

length - block cipher length in bits

Returns:

session key

Throws:

java.security.NoSuchAlgorithmException - unknown algorithm

java.security.InvalidKeyException - key is not valid

publicKeyToBytes

public static byte[] publicKeyToBytes(java.security.PublicKey pub)

get a byte presentation of a PublicKey object

Parameters:

pub - the public key

Returns:

byte representation of a public key

bytesToPublicKey

public static java.security.PublicKey bytesToPublicKey(byte[] keyBytes)
                                                throws java.security.NoSuchAlgorithmException,
                                                       java.security.spec.InvalidKeySpecException

convert byte representation of a public key to a PublicKey object

Parameters:

keyBytes - byte representation of a public key

Returns:

PublicKey object

Throws:

java.security.NoSuchAlgorithmException - unknown algorithm

java.security.spec.InvalidKeySpecException