| /* |
| * Copyright (c) 2018, 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 sun.security.ec; |
| |
| import java.math.BigInteger; |
| import java.security.KeyPairGeneratorSpi; |
| import java.security.InvalidKeyException; |
| import java.security.InvalidParameterException; |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.KeyPair; |
| import java.security.ProviderException; |
| import java.security.SecureRandom; |
| import java.security.spec.AlgorithmParameterSpec; |
| import java.security.spec.NamedParameterSpec; |
| |
| import sun.security.jca.JCAUtil; |
| |
| /** |
| * Key pair generator for the XDH key agreement algorithm. |
| */ |
| public class XDHKeyPairGenerator extends KeyPairGeneratorSpi { |
| |
| private static final NamedParameterSpec DEFAULT_PARAM_SPEC |
| = NamedParameterSpec.X25519; |
| |
| private SecureRandom random = null; |
| private XECOperations ops = null; |
| private XECParameters lockedParams = null; |
| |
| XDHKeyPairGenerator() { |
| tryInitialize(DEFAULT_PARAM_SPEC); |
| } |
| |
| private XDHKeyPairGenerator(NamedParameterSpec paramSpec) { |
| tryInitialize(paramSpec); |
| lockedParams = ops.getParameters(); |
| } |
| |
| private void tryInitialize(NamedParameterSpec paramSpec) { |
| try { |
| initialize(paramSpec, null); |
| } catch (InvalidAlgorithmParameterException ex) { |
| String name = paramSpec.getName(); |
| throw new ProviderException(name + " not supported"); |
| } |
| } |
| |
| @Override |
| public void initialize(int keySize, SecureRandom random) { |
| |
| XECParameters params = XECParameters.getBySize( |
| InvalidParameterException::new, keySize); |
| |
| initializeImpl(params, random); |
| } |
| |
| @Override |
| public void initialize(AlgorithmParameterSpec params, SecureRandom random) |
| throws InvalidAlgorithmParameterException { |
| |
| XECParameters xecParams = XECParameters.get( |
| InvalidAlgorithmParameterException::new, params); |
| |
| initializeImpl(xecParams, random); |
| } |
| |
| private void initializeImpl(XECParameters params, SecureRandom random) { |
| |
| if (lockedParams != null && lockedParams != params) { |
| throw new InvalidParameterException("Parameters must be " + |
| lockedParams.getName()); |
| } |
| |
| this.ops = new XECOperations(params); |
| this.random = random == null ? JCAUtil.getSecureRandom() : random; |
| } |
| |
| |
| @Override |
| public KeyPair generateKeyPair() { |
| |
| byte[] privateKey = ops.generatePrivate(random); |
| // computePublic may modify the private key, so clone it first |
| BigInteger publicKey = ops.computePublic(privateKey.clone()); |
| |
| try { |
| return new KeyPair( |
| new XDHPublicKeyImpl(ops.getParameters(), publicKey), |
| new XDHPrivateKeyImpl(ops.getParameters(), privateKey) |
| ); |
| } catch (InvalidKeyException ex) { |
| throw new ProviderException(ex); |
| } |
| } |
| |
| static class X25519 extends XDHKeyPairGenerator { |
| |
| public X25519() { |
| super(NamedParameterSpec.X25519); |
| } |
| } |
| |
| static class X448 extends XDHKeyPairGenerator { |
| |
| public X448() { |
| super(NamedParameterSpec.X448); |
| } |
| } |
| } |