1 /*
2 * Copyright (c) 2005, 2009, 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
26 package com.sun.crypto.provider;
27
28 import java.security.*;
29 import java.security.spec.AlgorithmParameterSpec;
30
31 import javax.crypto.*;
32
33 import sun.security.internal.interfaces.TlsMasterSecret;
34 import sun.security.internal.spec.TlsMasterSecretParameterSpec;
35
36 import static com.sun.crypto.provider.TlsPrfGenerator.*;
37
38 /**
39 * KeyGenerator implementation for the SSL/TLS master secret derivation.
40 *
41 * @author Andreas Sterbenz
42 * @since 1.6
43 */
44 public final class TlsMasterSecretGenerator extends KeyGeneratorSpi {
45
46 private final static String MSG = "TlsMasterSecretGenerator must be "
47 + "initialized using a TlsMasterSecretParameterSpec";
48
49 private TlsMasterSecretParameterSpec spec;
50
51 private int protocolVersion;
52
53 public TlsMasterSecretGenerator() {
54 }
55
56 protected void engineInit(SecureRandom random) {
57 throw new InvalidParameterException(MSG);
58 }
59
60 protected void engineInit(AlgorithmParameterSpec params,
61 SecureRandom random) throws InvalidAlgorithmParameterException {
62 if (params instanceof TlsMasterSecretParameterSpec == false) {
63 throw new InvalidAlgorithmParameterException(MSG);
64 }
65 this.spec = (TlsMasterSecretParameterSpec)params;
66 if ("RAW".equals(spec.getPremasterSecret().getFormat()) == false) {
67 throw new InvalidAlgorithmParameterException("Key format must be RAW");
68 }
69 protocolVersion = (spec.getMajorVersion() << 8) | spec.getMinorVersion();
70 if ((protocolVersion < 0x0300) || (protocolVersion > 0x0302)) {
71 throw new InvalidAlgorithmParameterException
72 ("Only SSL 3.0, TLS 1.0, and TLS 1.1 supported");
73 }
74 }
75
76 protected void engineInit(int keysize, SecureRandom random) {
77 throw new InvalidParameterException(MSG);
78 }
79
80 protected SecretKey engineGenerateKey() {
81 if (spec == null) {
82 throw new IllegalStateException
83 ("TlsMasterSecretGenerator must be initialized");
84 }
85 SecretKey premasterKey = spec.getPremasterSecret();
86 byte[] premaster = premasterKey.getEncoded();
87
88 int premasterMajor, premasterMinor;
89 if (premasterKey.getAlgorithm().equals("TlsRsaPremasterSecret")) {
90 // RSA
91 premasterMajor = premaster[0] & 0xff;
92 premasterMinor = premaster[1] & 0xff;
93 } else {
94 // DH, KRB5, others
95 premasterMajor = -1;
96 premasterMinor = -1;
97 }
98
99 try {
100 byte[] master;
101 byte[] clientRandom = spec.getClientRandom();
102 byte[] serverRandom = spec.getServerRandom();
103
104 if (protocolVersion >= 0x0301) {
105 byte[] seed = concat(clientRandom, serverRandom);
106 master = doPRF(premaster, LABEL_MASTER_SECRET, seed, 48);
107 } else {
108 master = new byte[48];
109 MessageDigest md5 = MessageDigest.getInstance("MD5");
110 MessageDigest sha = MessageDigest.getInstance("SHA");
111
112 byte[] tmp = new byte[20];
113 for (int i = 0; i < 3; i++) {
114 sha.update(SSL3_CONST[i]);
115 sha.update(premaster);
116 sha.update(clientRandom);
117 sha.update(serverRandom);
118 sha.digest(tmp, 0, 20);
119
120 md5.update(premaster);
121 md5.update(tmp);
122 md5.digest(master, i << 4, 16);
123 }
124
125 }
126
127 return new TlsMasterSecretKey(master, premasterMajor, premasterMinor);
128 } catch (NoSuchAlgorithmException e) {
129 throw new ProviderException(e);
130 } catch (DigestException e) {
131 throw new ProviderException(e);
132 }
133 }
134
135 private static final class TlsMasterSecretKey implements TlsMasterSecret {
136
137 private byte[] key;
138 private final int majorVersion, minorVersion;
139
140 TlsMasterSecretKey(byte[] key, int majorVersion, int minorVersion) {
141 this.key = key;
142 this.majorVersion = majorVersion;
143 this.minorVersion = minorVersion;
144 }
145
146 public int getMajorVersion() {
147 return majorVersion;
148 }
149
150 public int getMinorVersion() {
151 return minorVersion;
152 }
153
154 public String getAlgorithm() {
155 return "TlsMasterSecret";
156 }
157
158 public String getFormat() {
159 return "RAW";
160 }
161
162 public byte[] getEncoded() {
163 return key.clone();
164 }
165
166 }
167
168 }