J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | import javax.crypto.spec.SecretKeySpec; |
| 33 | |
| 34 | /** |
| 35 | * KeyGeneratore core implementation and individual key generator |
| 36 | * implementations. Because of US export regulations, we cannot use |
| 37 | * subclassing to achieve code sharing between the key generator |
| 38 | * implementations for our various algorithms. Instead, we have the |
| 39 | * core implementation in this KeyGeneratorCore class, which is used |
| 40 | * by the individual implementations. See those further down in this |
| 41 | * file. |
| 42 | * |
| 43 | * @since 1.5 |
| 44 | * @author Andreas Sterbenz |
| 45 | */ |
| 46 | final class KeyGeneratorCore { |
| 47 | |
| 48 | // algorithm name to use for the generator keys |
| 49 | private final String name; |
| 50 | |
| 51 | // default key size in bits |
| 52 | private final int defaultKeySize; |
| 53 | |
| 54 | // current key size in bits |
| 55 | private int keySize; |
| 56 | |
| 57 | // PRNG to use |
| 58 | private SecureRandom random; |
| 59 | |
| 60 | /** |
| 61 | * Construct a new KeyGeneratorCore object with the specified name |
| 62 | * and defaultKeySize. Initialize to default key size in case the |
| 63 | * application does not call any of the init() methods. |
| 64 | */ |
| 65 | KeyGeneratorCore(String name, int defaultKeySize) { |
| 66 | this.name = name; |
| 67 | this.defaultKeySize = defaultKeySize; |
| 68 | implInit(null); |
| 69 | } |
| 70 | |
| 71 | // implementation for engineInit(), see JCE doc |
| 72 | // reset keySize to default |
| 73 | void implInit(SecureRandom random) { |
| 74 | this.keySize = defaultKeySize; |
| 75 | this.random = random; |
| 76 | } |
| 77 | |
| 78 | // implementation for engineInit(), see JCE doc |
| 79 | // we do not support any parameters |
| 80 | void implInit(AlgorithmParameterSpec params, SecureRandom random) |
| 81 | throws InvalidAlgorithmParameterException { |
| 82 | throw new InvalidAlgorithmParameterException |
| 83 | (name + " key generation does not take any parameters"); |
| 84 | } |
| 85 | |
| 86 | // implementation for engineInit(), see JCE doc |
| 87 | // we enforce a general 40 bit minimum key size for security |
| 88 | void implInit(int keysize, SecureRandom random) { |
| 89 | if (keysize < 40) { |
| 90 | throw new InvalidParameterException |
| 91 | ("Key length must be at least 40 bits"); |
| 92 | } |
| 93 | this.keySize = keysize; |
| 94 | this.random = random; |
| 95 | } |
| 96 | |
| 97 | // implementation for engineInit(), see JCE doc |
| 98 | // generate the key |
| 99 | SecretKey implGenerateKey() { |
| 100 | if (random == null) { |
| 101 | random = SunJCE.RANDOM; |
| 102 | } |
| 103 | byte[] b = new byte[(keySize + 7) >> 3]; |
| 104 | random.nextBytes(b); |
| 105 | return new SecretKeySpec(b, name); |
| 106 | } |
| 107 | |
| 108 | // nested static class for the HmacSHA256 key generator |
| 109 | public static final class HmacSHA256KG extends KeyGeneratorSpi { |
| 110 | private final KeyGeneratorCore core; |
| 111 | public HmacSHA256KG() { |
| 112 | SunJCE.ensureIntegrity(getClass()); |
| 113 | core = new KeyGeneratorCore("HmacSHA256", 256); |
| 114 | } |
| 115 | protected void engineInit(SecureRandom random) { |
| 116 | core.implInit(random); |
| 117 | } |
| 118 | protected void engineInit(AlgorithmParameterSpec params, |
| 119 | SecureRandom random) throws InvalidAlgorithmParameterException { |
| 120 | core.implInit(params, random); |
| 121 | } |
| 122 | protected void engineInit(int keySize, SecureRandom random) { |
| 123 | core.implInit(keySize, random); |
| 124 | } |
| 125 | protected SecretKey engineGenerateKey() { |
| 126 | return core.implGenerateKey(); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | // nested static class for the HmacSHA384 key generator |
| 131 | public static final class HmacSHA384KG extends KeyGeneratorSpi { |
| 132 | private final KeyGeneratorCore core; |
| 133 | public HmacSHA384KG() { |
| 134 | SunJCE.ensureIntegrity(getClass()); |
| 135 | core = new KeyGeneratorCore("HmacSHA384", 384); |
| 136 | } |
| 137 | protected void engineInit(SecureRandom random) { |
| 138 | core.implInit(random); |
| 139 | } |
| 140 | protected void engineInit(AlgorithmParameterSpec params, |
| 141 | SecureRandom random) throws InvalidAlgorithmParameterException { |
| 142 | core.implInit(params, random); |
| 143 | } |
| 144 | protected void engineInit(int keySize, SecureRandom random) { |
| 145 | core.implInit(keySize, random); |
| 146 | } |
| 147 | protected SecretKey engineGenerateKey() { |
| 148 | return core.implGenerateKey(); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | // nested static class for the HmacSHA384 key generator |
| 153 | public static final class HmacSHA512KG extends KeyGeneratorSpi { |
| 154 | private final KeyGeneratorCore core; |
| 155 | public HmacSHA512KG() { |
| 156 | SunJCE.ensureIntegrity(getClass()); |
| 157 | core = new KeyGeneratorCore("HmacSHA512", 512); |
| 158 | } |
| 159 | protected void engineInit(SecureRandom random) { |
| 160 | core.implInit(random); |
| 161 | } |
| 162 | protected void engineInit(AlgorithmParameterSpec params, |
| 163 | SecureRandom random) throws InvalidAlgorithmParameterException { |
| 164 | core.implInit(params, random); |
| 165 | } |
| 166 | protected void engineInit(int keySize, SecureRandom random) { |
| 167 | core.implInit(keySize, random); |
| 168 | } |
| 169 | protected SecretKey engineGenerateKey() { |
| 170 | return core.implGenerateKey(); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | // nested static class for the RC2 key generator |
| 175 | public static final class RC2KeyGenerator extends KeyGeneratorSpi { |
| 176 | private final KeyGeneratorCore core; |
| 177 | public RC2KeyGenerator() { |
| 178 | SunJCE.ensureIntegrity(getClass()); |
| 179 | core = new KeyGeneratorCore("RC2", 128); |
| 180 | } |
| 181 | protected void engineInit(SecureRandom random) { |
| 182 | core.implInit(random); |
| 183 | } |
| 184 | protected void engineInit(AlgorithmParameterSpec params, |
| 185 | SecureRandom random) throws InvalidAlgorithmParameterException { |
| 186 | core.implInit(params, random); |
| 187 | } |
| 188 | protected void engineInit(int keySize, SecureRandom random) { |
| 189 | if ((keySize < 40) || (keySize > 1024)) { |
| 190 | throw new InvalidParameterException("Key length for RC2" |
| 191 | + " must be between 40 and 1024 bits"); |
| 192 | } |
| 193 | core.implInit(keySize, random); |
| 194 | } |
| 195 | protected SecretKey engineGenerateKey() { |
| 196 | return core.implGenerateKey(); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | // nested static class for the ARCFOUR (RC4) key generator |
| 201 | public static final class ARCFOURKeyGenerator extends KeyGeneratorSpi { |
| 202 | private final KeyGeneratorCore core; |
| 203 | public ARCFOURKeyGenerator() { |
| 204 | SunJCE.ensureIntegrity(getClass()); |
| 205 | core = new KeyGeneratorCore("ARCFOUR", 128); |
| 206 | } |
| 207 | protected void engineInit(SecureRandom random) { |
| 208 | core.implInit(random); |
| 209 | } |
| 210 | protected void engineInit(AlgorithmParameterSpec params, |
| 211 | SecureRandom random) throws InvalidAlgorithmParameterException { |
| 212 | core.implInit(params, random); |
| 213 | } |
| 214 | protected void engineInit(int keySize, SecureRandom random) { |
| 215 | if ((keySize < 40) || (keySize > 1024)) { |
| 216 | throw new InvalidParameterException("Key length for ARCFOUR" |
| 217 | + " must be between 40 and 1024 bits"); |
| 218 | } |
| 219 | core.implInit(keySize, random); |
| 220 | } |
| 221 | protected SecretKey engineGenerateKey() { |
| 222 | return core.implGenerateKey(); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | } |