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| 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.nio.ByteBuffer; | |
| 29 | + | |
| 30 | +import javax.crypto.MacSpi; | |
| 31 | +import javax.crypto.SecretKey; | |
| 32 | +import java.security.*; | |
| 33 | +import java.security.spec.AlgorithmParameterSpec; | |
| 34 | + | |
| 35 | +import static com.sun.crypto.provider.TlsPrfGenerator.genPad; | |
| 36 | + | |
| 37 | +/** | |
| 38 | + * This file contains the code for the SslMacMD5 and SslMacSHA1 implementations. | |
| 39 | + * The SSL 3.0 MAC is a variation of the HMAC algorithm. | |
| 40 | + * | |
| 41 | + * Note that we don't implement Cloneable as that is not needed for SSL. | |
| 42 | + * | |
| 43 | + * @author Andreas Sterbenz | |
| 44 | + * @since 1.6 | |
| 45 | + */ | |
| 46 | +final class SslMacCore { | |
| 47 | + | |
| 48 | + private final MessageDigest md; | |
| 49 | + private final byte[] pad1, pad2; | |
| 50 | + | |
| 51 | + private boolean first; // Is this the first data to be processed? | |
| 52 | + private byte[] secret; | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * Standard constructor, creates a new SslMacCore instance instantiating | |
| 56 | + * a MessageDigest of the specified name. | |
| 57 | + */ | |
| 58 | + SslMacCore(String digestAlgorithm, byte[] pad1, byte[] pad2) | |
| 59 | + throws NoSuchAlgorithmException { | |
| 60 | + md = MessageDigest.getInstance(digestAlgorithm); | |
| 61 | + this.pad1 = pad1; | |
| 62 | + this.pad2 = pad2; | |
| 63 | + first = true; | |
| 64 | + } | |
| 65 | + | |
| 66 | + /** | |
| 67 | + * Returns the length of the Mac in bytes. | |
| 68 | + * | |
| 69 | + * @return the Mac length in bytes. | |
| 70 | + */ | |
| 71 | + int getDigestLength() { | |
| 72 | + return md.getDigestLength(); | |
| 73 | + } | |
| 74 | + | |
| 75 | + /** | |
| 76 | + * Initializes the Mac with the given secret key and algorithm parameters. | |
| 77 | + * | |
| 78 | + * @param key the secret key. | |
| 79 | + * @param params the algorithm parameters. | |
| 80 | + * | |
| 81 | + * @exception InvalidKeyException if the given key is inappropriate for | |
| 82 | + * initializing this MAC. | |
| 83 | + * @exception InvalidAlgorithmParameterException if the given algorithm | |
| 84 | + * parameters are inappropriate for this MAC. | |
| 85 | + */ | |
| 86 | + void init(Key key, AlgorithmParameterSpec params) | |
| 87 | + throws InvalidKeyException, InvalidAlgorithmParameterException { | |
| 88 | + | |
| 89 | + if (params != null) { | |
| 90 | + throw new InvalidAlgorithmParameterException | |
| 91 | + ("SslMac does not use parameters"); | |
| 92 | + } | |
| 93 | + | |
| 94 | + if (!(key instanceof SecretKey)) { | |
| 95 | + throw new InvalidKeyException("Secret key expected"); | |
| 96 | + } | |
| 97 | + | |
| 98 | + secret = key.getEncoded(); | |
| 99 | + if (secret == null || secret.length == 0) { | |
| 100 | + throw new InvalidKeyException("Missing key data"); | |
| 101 | + } | |
| 102 | + | |
| 103 | + reset(); | |
| 104 | + } | |
| 105 | + | |
| 106 | + /** | |
| 107 | + * Processes the given byte. | |
| 108 | + * | |
| 109 | + * @param input the input byte to be processed. | |
| 110 | + */ | |
| 111 | + void update(byte input) { | |
| 112 | + if (first == true) { | |
| 113 | + // compute digest for 1st pass; start with inner pad | |
| 114 | + md.update(secret); | |
| 115 | + md.update(pad1); | |
| 116 | + first = false; | |
| 117 | + } | |
| 118 | + | |
| 119 | + // add the passed byte to the inner digest | |
| 120 | + md.update(input); | |
| 121 | + } | |
| 122 | + | |
| 123 | + /** | |
| 124 | + * Processes the first <code>len</code> bytes in <code>input</code>, | |
| 125 | + * starting at <code>offset</code>. | |
| 126 | + * | |
| 127 | + * @param input the input buffer. | |
| 128 | + * @param offset the offset in <code>input</code> where the input starts. | |
| 129 | + * @param len the number of bytes to process. | |
| 130 | + */ | |
| 131 | + void update(byte input[], int offset, int len) { | |
| 132 | + if (first == true) { | |
| 133 | + // compute digest for 1st pass; start with inner pad | |
| 134 | + md.update(secret); | |
| 135 | + md.update(pad1); | |
| 136 | + first = false; | |
| 137 | + } | |
| 138 | + | |
| 139 | + // add the selected part of an array of bytes to the inner digest | |
| 140 | + md.update(input, offset, len); | |
| 141 | + } | |
| 142 | + | |
| 143 | + void update(ByteBuffer input) { | |
| 144 | + if (first == true) { | |
| 145 | + // compute digest for 1st pass; start with inner pad | |
| 146 | + md.update(secret); | |
| 147 | + md.update(pad1); | |
| 148 | + first = false; | |
| 149 | + } | |
| 150 | + | |
| 151 | + md.update(input); | |
| 152 | + } | |
| 153 | + | |
| 154 | + /** | |
| 155 | + * Completes the Mac computation and resets the Mac for further use, | |
| 156 | + * maintaining the secret key that the Mac was initialized with. | |
| 157 | + * | |
| 158 | + * @return the Mac result. | |
| 159 | + */ | |
| 160 | + byte[] doFinal() { | |
| 161 | + if (first == true) { | |
| 162 | + // compute digest for 1st pass; start with inner pad | |
| 163 | + md.update(secret); | |
| 164 | + md.update(pad1); | |
| 165 | + } else { | |
| 166 | + first = true; | |
| 167 | + } | |
| 168 | + | |
| 169 | + try { | |
| 170 | + // finish the inner digest | |
| 171 | + byte[] tmp = md.digest(); | |
| 172 | + | |
| 173 | + // compute digest for 2nd pass; start with outer pad | |
| 174 | + md.update(secret); | |
| 175 | + md.update(pad2); | |
| 176 | + // add result of 1st hash | |
| 177 | + md.update(tmp); | |
| 178 | + | |
| 179 | + md.digest(tmp, 0, tmp.length); | |
| 180 | + return tmp; | |
| 181 | + } catch (DigestException e) { | |
| 182 | + // should never occur | |
| 183 | + throw new ProviderException(e); | |
| 184 | + } | |
| 185 | + } | |
| 186 | + | |
| 187 | + /** | |
| 188 | + * Resets the Mac for further use, maintaining the secret key that the | |
| 189 | + * Mac was initialized with. | |
| 190 | + */ | |
| 191 | + void reset() { | |
| 192 | + if (first == false) { | |
| 193 | + md.reset(); | |
| 194 | + first = true; | |
| 195 | + } | |
| 196 | + } | |
| 197 | + | |
| 198 | + // nested static class for the SslMacMD5 implementation | |
| 199 | + public static final class SslMacMD5 extends MacSpi { | |
| 200 | + private final SslMacCore core; | |
| 201 | + public SslMacMD5() throws NoSuchAlgorithmException { | |
| 202 | + core = new SslMacCore("MD5", md5Pad1, md5Pad2); | |
| 203 | + } | |
| 204 | + protected int engineGetMacLength() { | |
| 205 | + return core.getDigestLength(); | |
| 206 | + } | |
| 207 | + protected void engineInit(Key key, AlgorithmParameterSpec params) | |
| 208 | + throws InvalidKeyException, InvalidAlgorithmParameterException { | |
| 209 | + core.init(key, params); | |
| 210 | + } | |
| 211 | + protected void engineUpdate(byte input) { | |
| 212 | + core.update(input); | |
| 213 | + } | |
| 214 | + protected void engineUpdate(byte input[], int offset, int len) { | |
| 215 | + core.update(input, offset, len); | |
| 216 | + } | |
| 217 | + protected void engineUpdate(ByteBuffer input) { | |
| 218 | + core.update(input); | |
| 219 | + } | |
| 220 | + protected byte[] engineDoFinal() { | |
| 221 | + return core.doFinal(); | |
| 222 | + } | |
| 223 | + protected void engineReset() { | |
| 224 | + core.reset(); | |
| 225 | + } | |
| 226 | + | |
| 227 | + static final byte[] md5Pad1 = genPad((byte)0x36, 48); | |
| 228 | + static final byte[] md5Pad2 = genPad((byte)0x5c, 48); | |
| 229 | + } | |
| 230 | + | |
| 231 | + // nested static class for the SslMacMD5 implementation | |
| 232 | + public static final class SslMacSHA1 extends MacSpi { | |
| 233 | + private final SslMacCore core; | |
| 234 | + public SslMacSHA1() throws NoSuchAlgorithmException { | |
| 235 | + core = new SslMacCore("SHA", shaPad1, shaPad2); | |
| 236 | + } | |
| 237 | + protected int engineGetMacLength() { | |
| 238 | + return core.getDigestLength(); | |
| 239 | + } | |
| 240 | + protected void engineInit(Key key, AlgorithmParameterSpec params) | |
| 241 | + throws InvalidKeyException, InvalidAlgorithmParameterException { | |
| 242 | + core.init(key, params); | |
| 243 | + } | |
| 244 | + protected void engineUpdate(byte input) { | |
| 245 | + core.update(input); | |
| 246 | + } | |
| 247 | + protected void engineUpdate(byte input[], int offset, int len) { | |
| 248 | + core.update(input, offset, len); | |
| 249 | + } | |
| 250 | + protected void engineUpdate(ByteBuffer input) { | |
| 251 | + core.update(input); | |
| 252 | + } | |
| 253 | + protected byte[] engineDoFinal() { | |
| 254 | + return core.doFinal(); | |
| 255 | + } | |
| 256 | + protected void engineReset() { | |
| 257 | + core.reset(); | |
| 258 | + } | |
| 259 | + | |
| 260 | + static final byte[] shaPad1 = genPad((byte)0x36, 40); | |
| 261 | + static final byte[] shaPad2 = genPad((byte)0x5c, 40); | |
| 262 | + } | |
| 263 | + | |
| 264 | +} | |