| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.security.Key; |
| import java.security.PublicKey; |
| import java.security.PrivateKey; |
| import java.security.KeyFactorySpi; |
| import java.security.InvalidKeyException; |
| import java.security.spec.KeySpec; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.X509EncodedKeySpec; |
| import java.security.spec.PKCS8EncodedKeySpec; |
| import javax.crypto.spec.DHPublicKeySpec; |
| import javax.crypto.spec.DHPrivateKeySpec; |
| import javax.crypto.spec.DHParameterSpec; |
| |
| /** |
| * This class implements the Diffie-Hellman key factory of the Sun provider. |
| * |
| * @author Jan Luehe |
| * |
| */ |
| public final class DHKeyFactory extends KeyFactorySpi { |
| |
| /** |
| * Empty constructor |
| */ |
| public DHKeyFactory() { |
| } |
| |
| /** |
| * Generates a public key object from the provided key specification |
| * (key material). |
| * |
| * @param keySpec the specification (key material) of the public key |
| * |
| * @return the public key |
| * |
| * @exception InvalidKeySpecException if the given key specification |
| * is inappropriate for this key factory to produce a public key. |
| */ |
| protected PublicKey engineGeneratePublic(KeySpec keySpec) |
| throws InvalidKeySpecException |
| { |
| try { |
| if (keySpec instanceof DHPublicKeySpec) { |
| DHPublicKeySpec dhPubKeySpec = (DHPublicKeySpec)keySpec; |
| return new DHPublicKey(dhPubKeySpec.getY(), |
| dhPubKeySpec.getP(), |
| dhPubKeySpec.getG()); |
| |
| } else if (keySpec instanceof X509EncodedKeySpec) { |
| return new DHPublicKey |
| (((X509EncodedKeySpec)keySpec).getEncoded()); |
| |
| } else { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification"); |
| } |
| } catch (InvalidKeyException e) { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification", e); |
| } |
| } |
| |
| /** |
| * Generates a private key object from the provided key specification |
| * (key material). |
| * |
| * @param keySpec the specification (key material) of the private key |
| * |
| * @return the private key |
| * |
| * @exception InvalidKeySpecException if the given key specification |
| * is inappropriate for this key factory to produce a private key. |
| */ |
| protected PrivateKey engineGeneratePrivate(KeySpec keySpec) |
| throws InvalidKeySpecException |
| { |
| try { |
| if (keySpec instanceof DHPrivateKeySpec) { |
| DHPrivateKeySpec dhPrivKeySpec = (DHPrivateKeySpec)keySpec; |
| return new DHPrivateKey(dhPrivKeySpec.getX(), |
| dhPrivKeySpec.getP(), |
| dhPrivKeySpec.getG()); |
| |
| } else if (keySpec instanceof PKCS8EncodedKeySpec) { |
| return new DHPrivateKey |
| (((PKCS8EncodedKeySpec)keySpec).getEncoded()); |
| |
| } else { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification"); |
| } |
| } catch (InvalidKeyException e) { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification", e); |
| } |
| } |
| |
| /** |
| * Returns a specification (key material) of the given key object |
| * in the requested format. |
| * |
| * @param key the key |
| * |
| * @param keySpec the requested format in which the key material shall be |
| * returned |
| * |
| * @return the underlying key specification (key material) in the |
| * requested format |
| * |
| * @exception InvalidKeySpecException if the requested key specification is |
| * inappropriate for the given key, or the given key cannot be processed |
| * (e.g., the given key has an unrecognized algorithm or format). |
| */ |
| protected <T extends KeySpec> |
| T engineGetKeySpec(Key key, Class<T> keySpec) |
| throws InvalidKeySpecException { |
| DHParameterSpec params; |
| |
| if (key instanceof javax.crypto.interfaces.DHPublicKey) { |
| |
| if (DHPublicKeySpec.class.isAssignableFrom(keySpec)) { |
| javax.crypto.interfaces.DHPublicKey dhPubKey |
| = (javax.crypto.interfaces.DHPublicKey) key; |
| params = dhPubKey.getParams(); |
| return keySpec.cast(new DHPublicKeySpec(dhPubKey.getY(), |
| params.getP(), |
| params.getG())); |
| |
| } else if (X509EncodedKeySpec.class.isAssignableFrom(keySpec)) { |
| return keySpec.cast(new X509EncodedKeySpec(key.getEncoded())); |
| |
| } else { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification"); |
| } |
| |
| } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { |
| |
| if (DHPrivateKeySpec.class.isAssignableFrom(keySpec)) { |
| javax.crypto.interfaces.DHPrivateKey dhPrivKey |
| = (javax.crypto.interfaces.DHPrivateKey)key; |
| params = dhPrivKey.getParams(); |
| return keySpec.cast(new DHPrivateKeySpec(dhPrivKey.getX(), |
| params.getP(), |
| params.getG())); |
| |
| } else if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec)) { |
| return keySpec.cast(new PKCS8EncodedKeySpec(key.getEncoded())); |
| |
| } else { |
| throw new InvalidKeySpecException |
| ("Inappropriate key specification"); |
| } |
| |
| } else { |
| throw new InvalidKeySpecException("Inappropriate key type"); |
| } |
| } |
| |
| /** |
| * Translates a key object, whose provider may be unknown or potentially |
| * untrusted, into a corresponding key object of this key factory. |
| * |
| * @param key the key whose provider is unknown or untrusted |
| * |
| * @return the translated key |
| * |
| * @exception InvalidKeyException if the given key cannot be processed by |
| * this key factory. |
| */ |
| protected Key engineTranslateKey(Key key) |
| throws InvalidKeyException |
| { |
| try { |
| |
| if (key instanceof javax.crypto.interfaces.DHPublicKey) { |
| // Check if key originates from this factory |
| if (key instanceof com.sun.crypto.provider.DHPublicKey) { |
| return key; |
| } |
| // Convert key to spec |
| DHPublicKeySpec dhPubKeySpec |
| = engineGetKeySpec(key, DHPublicKeySpec.class); |
| // Create key from spec, and return it |
| return engineGeneratePublic(dhPubKeySpec); |
| |
| } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { |
| // Check if key originates from this factory |
| if (key instanceof com.sun.crypto.provider.DHPrivateKey) { |
| return key; |
| } |
| // Convert key to spec |
| DHPrivateKeySpec dhPrivKeySpec |
| = engineGetKeySpec(key, DHPrivateKeySpec.class); |
| // Create key from spec, and return it |
| return engineGeneratePrivate(dhPrivKeySpec); |
| |
| } else { |
| throw new InvalidKeyException("Wrong algorithm type"); |
| } |
| |
| } catch (InvalidKeySpecException e) { |
| throw new InvalidKeyException("Cannot translate key", e); |
| } |
| } |
| } |
