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287 lines
11 KiB
Java
287 lines
11 KiB
Java
/*
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.provider;
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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.AccessController;
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import java.security.interfaces.DSAParams;
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import java.security.spec.DSAPublicKeySpec;
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import java.security.spec.DSAPrivateKeySpec;
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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 sun.security.action.GetPropertyAction;
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/**
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* This class implements the DSA 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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* @since 1.2
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*/
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public class DSAKeyFactory extends KeyFactorySpi {
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// package private for DSAKeyPairGenerator
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static final boolean SERIAL_INTEROP;
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private static final String SERIAL_PROP = "sun.security.key.serial.interop";
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static {
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/**
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* Check to see if we need to maintain interoperability for serialized
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* keys between JDK 5.0 -> JDK 1.4. In other words, determine whether
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* a key object serialized in JDK 5.0 must be deserializable in
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* JDK 1.4.
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*
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* If true, then we generate sun.security.provider.DSAPublicKey.
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* If false, then we generate sun.security.provider.DSAPublicKeyImpl.
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*
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* By default this is false.
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* This incompatibility was introduced by 4532506.
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*/
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String prop = GetPropertyAction.privilegedGetProperty(SERIAL_PROP);
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SERIAL_INTEROP = "true".equalsIgnoreCase(prop);
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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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try {
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if (keySpec instanceof DSAPublicKeySpec) {
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DSAPublicKeySpec dsaPubKeySpec = (DSAPublicKeySpec)keySpec;
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if (SERIAL_INTEROP) {
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return new DSAPublicKey(dsaPubKeySpec.getY(),
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dsaPubKeySpec.getP(),
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dsaPubKeySpec.getQ(),
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dsaPubKeySpec.getG());
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} else {
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return new DSAPublicKeyImpl(dsaPubKeySpec.getY(),
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dsaPubKeySpec.getP(),
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dsaPubKeySpec.getQ(),
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dsaPubKeySpec.getG());
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}
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} else if (keySpec instanceof X509EncodedKeySpec) {
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if (SERIAL_INTEROP) {
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return new DSAPublicKey
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(((X509EncodedKeySpec)keySpec).getEncoded());
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} else {
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return new DSAPublicKeyImpl
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(((X509EncodedKeySpec)keySpec).getEncoded());
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}
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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: " + e.getMessage());
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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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try {
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if (keySpec instanceof DSAPrivateKeySpec) {
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DSAPrivateKeySpec dsaPrivKeySpec = (DSAPrivateKeySpec)keySpec;
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return new DSAPrivateKey(dsaPrivKeySpec.getX(),
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dsaPrivKeySpec.getP(),
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dsaPrivKeySpec.getQ(),
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dsaPrivKeySpec.getG());
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} else if (keySpec instanceof PKCS8EncodedKeySpec) {
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return new DSAPrivateKey
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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: " + e.getMessage());
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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 <T extends KeySpec>
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T engineGetKeySpec(Key key, Class<T> keySpec)
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throws InvalidKeySpecException {
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DSAParams params;
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try {
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if (key instanceof java.security.interfaces.DSAPublicKey) {
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// Determine valid key specs
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Class<?> dsaPubKeySpec = Class.forName
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("java.security.spec.DSAPublicKeySpec");
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Class<?> x509KeySpec = Class.forName
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("java.security.spec.X509EncodedKeySpec");
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if (dsaPubKeySpec.isAssignableFrom(keySpec)) {
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java.security.interfaces.DSAPublicKey dsaPubKey
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= (java.security.interfaces.DSAPublicKey)key;
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params = dsaPubKey.getParams();
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return keySpec.cast(new DSAPublicKeySpec(dsaPubKey.getY(),
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params.getP(),
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params.getQ(),
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params.getG()));
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} else if (x509KeySpec.isAssignableFrom(keySpec)) {
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return keySpec.cast(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 java.security.interfaces.DSAPrivateKey) {
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// Determine valid key specs
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Class<?> dsaPrivKeySpec = Class.forName
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("java.security.spec.DSAPrivateKeySpec");
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Class<?> pkcs8KeySpec = Class.forName
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("java.security.spec.PKCS8EncodedKeySpec");
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if (dsaPrivKeySpec.isAssignableFrom(keySpec)) {
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java.security.interfaces.DSAPrivateKey dsaPrivKey
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= (java.security.interfaces.DSAPrivateKey)key;
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params = dsaPrivKey.getParams();
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return keySpec.cast(new DSAPrivateKeySpec(dsaPrivKey.getX(),
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params.getP(),
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params.getQ(),
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params.getG()));
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} else if (pkcs8KeySpec.isAssignableFrom(keySpec)) {
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return keySpec.cast(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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} catch (ClassNotFoundException e) {
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throw new InvalidKeySpecException
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("Unsupported key specification: " + e.getMessage());
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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) throws InvalidKeyException {
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try {
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if (key instanceof java.security.interfaces.DSAPublicKey) {
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// Check if key originates from this factory
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if (key instanceof sun.security.provider.DSAPublicKey) {
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return key;
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}
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// Convert key to spec
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DSAPublicKeySpec dsaPubKeySpec
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= engineGetKeySpec(key, DSAPublicKeySpec.class);
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// Create key from spec, and return it
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return engineGeneratePublic(dsaPubKeySpec);
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} else if (key instanceof java.security.interfaces.DSAPrivateKey) {
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// Check if key originates from this factory
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if (key instanceof sun.security.provider.DSAPrivateKey) {
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return key;
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}
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// Convert key to spec
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DSAPrivateKeySpec dsaPrivKeySpec
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= engineGetKeySpec(key, DSAPrivateKeySpec.class);
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// Create key from spec, and return it
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return engineGeneratePrivate(dsaPrivKeySpec);
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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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+ e.getMessage());
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}
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}
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}
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