/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.security.provider.crypto;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactorySpi;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class DSAKeyFactoryImpl extends KeyFactorySpi {
/**
* This method generates a DSAPrivateKey object from the provided key specification.
*
* @param
* keySpec - the specification (key material) for the DSAPrivateKey.
*
* @return
* a DSAPrivateKey object
*
* @throws InvalidKeySpecException
* if "keySpec" is neither DSAPrivateKeySpec nor PKCS8EncodedKeySpec
*/
protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
throws InvalidKeySpecException {
if (keySpec != null) {
if (keySpec instanceof DSAPrivateKeySpec) {
return new DSAPrivateKeyImpl((DSAPrivateKeySpec) keySpec);
}
if (keySpec instanceof PKCS8EncodedKeySpec) {
return new DSAPrivateKeyImpl((PKCS8EncodedKeySpec) keySpec);
}
}
throw new InvalidKeySpecException("'keySpec' is neither DSAPrivateKeySpec nor PKCS8EncodedKeySpec");
}
/**
* This method generates a DSAPublicKey object from the provided key specification.
*
* @param
* keySpec - the specification (key material) for the DSAPublicKey.
*
* @return
* a DSAPublicKey object
*
* @throws InvalidKeySpecException
* if "keySpec" is neither DSAPublicKeySpec nor X509EncodedKeySpec
*/
protected PublicKey engineGeneratePublic(KeySpec keySpec)
throws InvalidKeySpecException {
if (keySpec != null) {
if (keySpec instanceof DSAPublicKeySpec) {
return new DSAPublicKeyImpl((DSAPublicKeySpec) keySpec);
}
if (keySpec instanceof X509EncodedKeySpec) {
return new DSAPublicKeyImpl((X509EncodedKeySpec) keySpec);
}
}
throw new InvalidKeySpecException("'keySpec' is neither DSAPublicKeySpec nor X509EncodedKeySpec");
}
/**
* This method returns a specification for the supplied key.
*
* The specification will be returned in the form of an object of the type
* specified by keySpec.
*
* @param key -
* either DSAPrivateKey or DSAPublicKey
* @param keySpec -
* either DSAPrivateKeySpec.class or DSAPublicKeySpec.class
*
* @return either a DSAPrivateKeySpec or a DSAPublicKeySpec
*
* @throws InvalidKeySpecException
* if "keySpec" is not a specification for DSAPublicKey or
* DSAPrivateKey
*/
protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec)
throws InvalidKeySpecException {
BigInteger p, q, g, x, y;
if (key != null) {
if (keySpec == null) {
throw new NullPointerException("keySpec == null");
}
if (key instanceof DSAPrivateKey) {
DSAPrivateKey privateKey = (DSAPrivateKey) key;
if (keySpec.equals(DSAPrivateKeySpec.class)) {
x = privateKey.getX();
DSAParams params = privateKey.getParams();
p = params.getP();
q = params.getQ();
g = params.getG();
return (T) (new DSAPrivateKeySpec(x, p, q, g));
}
if (keySpec.equals(PKCS8EncodedKeySpec.class)) {
return (T) (new PKCS8EncodedKeySpec(key.getEncoded()));
}
throw new InvalidKeySpecException("'keySpec' is neither DSAPrivateKeySpec nor PKCS8EncodedKeySpec");
}
if (key instanceof DSAPublicKey) {
DSAPublicKey publicKey = (DSAPublicKey) key;
if (keySpec.equals(DSAPublicKeySpec.class)) {
y = publicKey.getY();
DSAParams params = publicKey.getParams();
p = params.getP();
q = params.getQ();
g = params.getG();
return (T) (new DSAPublicKeySpec(y, p, q, g));
}
if (keySpec.equals(X509EncodedKeySpec.class)) {
return (T) (new X509EncodedKeySpec(key.getEncoded()));
}
throw new InvalidKeySpecException("'keySpec' is neither DSAPublicKeySpec nor X509EncodedKeySpec");
}
}
throw new InvalidKeySpecException("'key' is neither DSAPublicKey nor DSAPrivateKey");
}
/**
* The method generates a DSAPublicKey object from the provided key.
*
* @param
* key - a DSAPublicKey object or DSAPrivateKey object.
*
* @return
* object of the same type as the "key" argument
*
* @throws InvalidKeyException
* if "key" is neither DSAPublicKey nor DSAPrivateKey
*/
protected Key engineTranslateKey(Key key) throws InvalidKeyException {
if (key != null) {
if (key instanceof DSAPrivateKey) {
DSAPrivateKey privateKey = (DSAPrivateKey) key;
DSAParams params = privateKey.getParams();
try {
return engineGeneratePrivate(new DSAPrivateKeySpec(
privateKey.getX(), params.getP(), params.getQ(),
params.getG()));
} catch (InvalidKeySpecException e) {
// Actually this exception shouldn't be thrown
throw new InvalidKeyException("ATTENTION: InvalidKeySpecException: " + e);
}
}
if (key instanceof DSAPublicKey) {
DSAPublicKey publicKey = (DSAPublicKey) key;
DSAParams params = publicKey.getParams();
try {
return engineGeneratePublic(new DSAPublicKeySpec(publicKey
.getY(), params.getP(), params.getQ(), params
.getG()));
} catch (InvalidKeySpecException e) {
// Actually this exception shouldn't be thrown
throw new InvalidKeyException("ATTENTION: InvalidKeySpecException: " + e);
}
}
}
throw new InvalidKeyException("'key' is neither DSAPublicKey nor DSAPrivateKey");
}
}