1/*
2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.crypto.provider;
27
28import java.security.*;
29import java.security.spec.AlgorithmParameterSpec;
30
31import javax.crypto.*;
32import javax.crypto.spec.SecretKeySpec;
33
34import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;
35
36/**
37 * KeyGenerator implementation for the SSL/TLS RSA premaster secret.
38 *
39 * @author  Andreas Sterbenz
40 * @since   1.6
41 */
42public final class TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi {
43
44    private static final String MSG = "TlsRsaPremasterSecretGenerator must be "
45        + "initialized using a TlsRsaPremasterSecretParameterSpec";
46
47    @SuppressWarnings("deprecation")
48    private TlsRsaPremasterSecretParameterSpec spec;
49    private SecureRandom random;
50
51    public TlsRsaPremasterSecretGenerator() {
52    }
53
54    protected void engineInit(SecureRandom random) {
55        throw new InvalidParameterException(MSG);
56    }
57
58    @SuppressWarnings("deprecation")
59    protected void engineInit(AlgorithmParameterSpec params,
60            SecureRandom random) throws InvalidAlgorithmParameterException {
61        if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) {
62            throw new InvalidAlgorithmParameterException(MSG);
63        }
64        this.spec = (TlsRsaPremasterSecretParameterSpec)params;
65        this.random = random;
66    }
67
68    protected void engineInit(int keysize, SecureRandom random) {
69        throw new InvalidParameterException(MSG);
70    }
71
72    // Only can be used in client side to generate TLS RSA premaster secret.
73    protected SecretKey engineGenerateKey() {
74        if (spec == null) {
75            throw new IllegalStateException(
76                "TlsRsaPremasterSecretGenerator must be initialized");
77        }
78
79        byte[] b = spec.getEncodedSecret();
80        if (b == null) {
81            if (random == null) {
82                random = new SecureRandom();
83            }
84            b = new byte[48];
85            random.nextBytes(b);
86        }
87        b[0] = (byte)spec.getMajorVersion();
88        b[1] = (byte)spec.getMinorVersion();
89
90        return new SecretKeySpec(b, "TlsRsaPremasterSecret");
91    }
92
93}
94