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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.crypto.provider;
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import java.util.*;
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import java.lang.*;
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import java.security.Key;
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import java.security.PublicKey;
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import java.security.PrivateKey;
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import java.security.KeyFactorySpi;
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import java.security.InvalidKeyException;
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import java.security.spec.KeySpec;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.X509EncodedKeySpec;
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import java.security.spec.PKCS8EncodedKeySpec;
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import javax.crypto.spec.DHPublicKeySpec;
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import javax.crypto.spec.DHPrivateKeySpec;
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import javax.crypto.spec.DHParameterSpec;
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/**
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* This class implements the Diffie-Hellman key factory of the Sun provider.
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*
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* @author Jan Luehe
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*
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*/
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public final class DHKeyFactory extends KeyFactorySpi {
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/**
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* Verify the SunJCE provider in the constructor.
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*
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* @exception SecurityException if fails to verify
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* its own integrity
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*/
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public DHKeyFactory() {
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if (!SunJCE.verifySelfIntegrity(this.getClass())) {
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throw new SecurityException("The SunJCE provider may have " +
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"been tampered.");
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}
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}
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/**
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* Generates a public key object from the provided key specification
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* (key material).
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*
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* @param keySpec the specification (key material) of the public key
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*
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* @return the public key
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*
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* @exception InvalidKeySpecException if the given key specification
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* is inappropriate for this key factory to produce a public key.
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*/
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protected PublicKey engineGeneratePublic(KeySpec keySpec)
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throws InvalidKeySpecException
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{
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try {
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if (keySpec instanceof DHPublicKeySpec) {
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DHPublicKeySpec dhPubKeySpec = (DHPublicKeySpec)keySpec;
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return new DHPublicKey(dhPubKeySpec.getY(),
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dhPubKeySpec.getP(),
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dhPubKeySpec.getG());
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} else if (keySpec instanceof X509EncodedKeySpec) {
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return new DHPublicKey
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(((X509EncodedKeySpec)keySpec).getEncoded());
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} else {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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} catch (InvalidKeyException e) {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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}
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/**
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* Generates a private key object from the provided key specification
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* (key material).
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*
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* @param keySpec the specification (key material) of the private key
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*
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* @return the private key
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*
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* @exception InvalidKeySpecException if the given key specification
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* is inappropriate for this key factory to produce a private key.
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*/
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protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
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throws InvalidKeySpecException
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{
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try {
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if (keySpec instanceof DHPrivateKeySpec) {
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DHPrivateKeySpec dhPrivKeySpec = (DHPrivateKeySpec)keySpec;
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return new DHPrivateKey(dhPrivKeySpec.getX(),
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dhPrivKeySpec.getP(),
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dhPrivKeySpec.getG());
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} else if (keySpec instanceof PKCS8EncodedKeySpec) {
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return new DHPrivateKey
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(((PKCS8EncodedKeySpec)keySpec).getEncoded());
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} else {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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} catch (InvalidKeyException e) {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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}
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/**
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* Returns a specification (key material) of the given key object
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* in the requested format.
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*
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* @param key the key
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*
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* @param keySpec the requested format in which the key material shall be
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* returned
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*
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* @return the underlying key specification (key material) in the
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* requested format
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*
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* @exception InvalidKeySpecException if the requested key specification is
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* inappropriate for the given key, or the given key cannot be processed
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* (e.g., the given key has an unrecognized algorithm or format).
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*/
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protected KeySpec engineGetKeySpec(Key key, Class keySpec)
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throws InvalidKeySpecException {
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DHParameterSpec params;
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if (key instanceof javax.crypto.interfaces.DHPublicKey) {
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if (DHPublicKeySpec.class.isAssignableFrom(keySpec)) {
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javax.crypto.interfaces.DHPublicKey dhPubKey
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= (javax.crypto.interfaces.DHPublicKey) key;
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params = dhPubKey.getParams();
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return new DHPublicKeySpec(dhPubKey.getY(),
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params.getP(),
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params.getG());
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} else if (X509EncodedKeySpec.class.isAssignableFrom(keySpec)) {
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return new X509EncodedKeySpec(key.getEncoded());
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} else {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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} else if (key instanceof javax.crypto.interfaces.DHPrivateKey) {
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if (DHPrivateKeySpec.class.isAssignableFrom(keySpec)) {
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javax.crypto.interfaces.DHPrivateKey dhPrivKey
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= (javax.crypto.interfaces.DHPrivateKey)key;
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params = dhPrivKey.getParams();
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return new DHPrivateKeySpec(dhPrivKey.getX(),
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params.getP(),
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params.getG());
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} else if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec)) {
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return new PKCS8EncodedKeySpec(key.getEncoded());
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} else {
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throw new InvalidKeySpecException
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("Inappropriate key specification");
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}
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} else {
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throw new InvalidKeySpecException("Inappropriate key type");
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}
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}
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/**
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* Translates a key object, whose provider may be unknown or potentially
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* untrusted, into a corresponding key object of this key factory.
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*
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* @param key the key whose provider is unknown or untrusted
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*
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* @return the translated key
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*
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* @exception InvalidKeyException if the given key cannot be processed by
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* this key factory.
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*/
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protected Key engineTranslateKey(Key key)
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throws InvalidKeyException
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{
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try {
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if (key instanceof javax.crypto.interfaces.DHPublicKey) {
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// Check if key originates from this factory
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if (key instanceof com.sun.crypto.provider.DHPublicKey) {
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return key;
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}
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// Convert key to spec
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DHPublicKeySpec dhPubKeySpec
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= (DHPublicKeySpec)engineGetKeySpec
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(key, DHPublicKeySpec.class);
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// Create key from spec, and return it
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return engineGeneratePublic(dhPubKeySpec);
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} else if (key instanceof javax.crypto.interfaces.DHPrivateKey) {
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// Check if key originates from this factory
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if (key instanceof com.sun.crypto.provider.DHPrivateKey) {
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return key;
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}
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// Convert key to spec
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DHPrivateKeySpec dhPrivKeySpec
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= (DHPrivateKeySpec)engineGetKeySpec
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(key, DHPrivateKeySpec.class);
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// Create key from spec, and return it
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return engineGeneratePrivate(dhPrivKeySpec);
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} else {
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throw new InvalidKeyException("Wrong algorithm type");
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}
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} catch (InvalidKeySpecException e) {
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throw new InvalidKeyException("Cannot translate key");
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}
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}
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}
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