| /* |
| * 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; |
| |
| import org.apache.harmony.security.internal.nls.Messages; |
| |
| 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(Messages.getString("security.19C")); |
| } |
| |
| /** |
| * 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(Messages.getString("security.19D")); |
| } |
| |
| /** |
| * 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(Messages |
| .getString("security.19E")); |
| } |
| 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(Messages |
| .getString("security.19C")); |
| } |
| |
| 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(Messages |
| .getString("security.19D")); |
| } |
| } |
| throw new InvalidKeySpecException(Messages.getString("security.19F")); |
| } |
| |
| /** |
| * 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(Messages.getString( |
| "security.1A0", 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(Messages.getString( |
| "security.1A1", e)); |
| } |
| } |
| } |
| throw new InvalidKeyException(Messages.getString("security.19F")); |
| } |
| |
| } |