| /* |
| * Copyright (c) 2005, 2009, 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 com.sun.crypto.provider; |
| |
| import java.nio.ByteBuffer; |
| |
| import javax.crypto.MacSpi; |
| import javax.crypto.SecretKey; |
| import java.security.*; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| import static com.sun.crypto.provider.TlsPrfGenerator.genPad; |
| |
| /** |
| * This file contains the code for the SslMacMD5 and SslMacSHA1 implementations. |
| * The SSL 3.0 MAC is a variation of the HMAC algorithm. |
| * |
| * Note that we don't implement Cloneable as that is not needed for SSL. |
| * |
| * @author Andreas Sterbenz |
| * @since 1.6 |
| */ |
| final class SslMacCore { |
| |
| private final MessageDigest md; |
| private final byte[] pad1, pad2; |
| |
| private boolean first; // Is this the first data to be processed? |
| private byte[] secret; |
| |
| /** |
| * Standard constructor, creates a new SslMacCore instance instantiating |
| * a MessageDigest of the specified name. |
| */ |
| SslMacCore(String digestAlgorithm, byte[] pad1, byte[] pad2) |
| throws NoSuchAlgorithmException { |
| md = MessageDigest.getInstance(digestAlgorithm); |
| this.pad1 = pad1; |
| this.pad2 = pad2; |
| first = true; |
| } |
| |
| /** |
| * Returns the length of the Mac in bytes. |
| * |
| * @return the Mac length in bytes. |
| */ |
| int getDigestLength() { |
| return md.getDigestLength(); |
| } |
| |
| /** |
| * Initializes the Mac with the given secret key and algorithm parameters. |
| * |
| * @param key the secret key. |
| * @param params the algorithm parameters. |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this MAC. |
| * @exception InvalidAlgorithmParameterException if the given algorithm |
| * parameters are inappropriate for this MAC. |
| */ |
| void init(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| |
| if (params != null) { |
| throw new InvalidAlgorithmParameterException |
| ("SslMac does not use parameters"); |
| } |
| |
| if (!(key instanceof SecretKey)) { |
| throw new InvalidKeyException("Secret key expected"); |
| } |
| |
| secret = key.getEncoded(); |
| if (secret == null || secret.length == 0) { |
| throw new InvalidKeyException("Missing key data"); |
| } |
| |
| reset(); |
| } |
| |
| /** |
| * Processes the given byte. |
| * |
| * @param input the input byte to be processed. |
| */ |
| void update(byte input) { |
| if (first == true) { |
| // compute digest for 1st pass; start with inner pad |
| md.update(secret); |
| md.update(pad1); |
| first = false; |
| } |
| |
| // add the passed byte to the inner digest |
| md.update(input); |
| } |
| |
| /** |
| * Processes the first <code>len</code> bytes in <code>input</code>, |
| * starting at <code>offset</code>. |
| * |
| * @param input the input buffer. |
| * @param offset the offset in <code>input</code> where the input starts. |
| * @param len the number of bytes to process. |
| */ |
| void update(byte input[], int offset, int len) { |
| if (first == true) { |
| // compute digest for 1st pass; start with inner pad |
| md.update(secret); |
| md.update(pad1); |
| first = false; |
| } |
| |
| // add the selected part of an array of bytes to the inner digest |
| md.update(input, offset, len); |
| } |
| |
| void update(ByteBuffer input) { |
| if (first == true) { |
| // compute digest for 1st pass; start with inner pad |
| md.update(secret); |
| md.update(pad1); |
| first = false; |
| } |
| |
| md.update(input); |
| } |
| |
| /** |
| * Completes the Mac computation and resets the Mac for further use, |
| * maintaining the secret key that the Mac was initialized with. |
| * |
| * @return the Mac result. |
| */ |
| byte[] doFinal() { |
| if (first == true) { |
| // compute digest for 1st pass; start with inner pad |
| md.update(secret); |
| md.update(pad1); |
| } else { |
| first = true; |
| } |
| |
| try { |
| // finish the inner digest |
| byte[] tmp = md.digest(); |
| |
| // compute digest for 2nd pass; start with outer pad |
| md.update(secret); |
| md.update(pad2); |
| // add result of 1st hash |
| md.update(tmp); |
| |
| md.digest(tmp, 0, tmp.length); |
| return tmp; |
| } catch (DigestException e) { |
| // should never occur |
| throw new ProviderException(e); |
| } |
| } |
| |
| /** |
| * Resets the Mac for further use, maintaining the secret key that the |
| * Mac was initialized with. |
| */ |
| void reset() { |
| if (first == false) { |
| md.reset(); |
| first = true; |
| } |
| } |
| |
| // nested static class for the SslMacMD5 implementation |
| public static final class SslMacMD5 extends MacSpi { |
| private final SslMacCore core; |
| public SslMacMD5() throws NoSuchAlgorithmException { |
| core = new SslMacCore("MD5", md5Pad1, md5Pad2); |
| } |
| protected int engineGetMacLength() { |
| return core.getDigestLength(); |
| } |
| protected void engineInit(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| core.init(key, params); |
| } |
| protected void engineUpdate(byte input) { |
| core.update(input); |
| } |
| protected void engineUpdate(byte input[], int offset, int len) { |
| core.update(input, offset, len); |
| } |
| protected void engineUpdate(ByteBuffer input) { |
| core.update(input); |
| } |
| protected byte[] engineDoFinal() { |
| return core.doFinal(); |
| } |
| protected void engineReset() { |
| core.reset(); |
| } |
| |
| static final byte[] md5Pad1 = genPad((byte)0x36, 48); |
| static final byte[] md5Pad2 = genPad((byte)0x5c, 48); |
| } |
| |
| // nested static class for the SslMacMD5 implementation |
| public static final class SslMacSHA1 extends MacSpi { |
| private final SslMacCore core; |
| public SslMacSHA1() throws NoSuchAlgorithmException { |
| core = new SslMacCore("SHA", shaPad1, shaPad2); |
| } |
| protected int engineGetMacLength() { |
| return core.getDigestLength(); |
| } |
| protected void engineInit(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| core.init(key, params); |
| } |
| protected void engineUpdate(byte input) { |
| core.update(input); |
| } |
| protected void engineUpdate(byte input[], int offset, int len) { |
| core.update(input, offset, len); |
| } |
| protected void engineUpdate(ByteBuffer input) { |
| core.update(input); |
| } |
| protected byte[] engineDoFinal() { |
| return core.doFinal(); |
| } |
| protected void engineReset() { |
| core.reset(); |
| } |
| |
| static final byte[] shaPad1 = genPad((byte)0x36, 40); |
| static final byte[] shaPad2 = genPad((byte)0x5c, 40); |
| } |
| |
| } |