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/*
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* Copyright 1996-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.security;
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import java.util.*;
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import java.lang.*;
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import java.io.IOException;
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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import java.io.InputStream;
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import java.io.ByteArrayInputStream;
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import java.nio.ByteBuffer;
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/**
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* This MessageDigest class provides applications the functionality of a
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* message digest algorithm, such as MD5 or SHA.
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* Message digests are secure one-way hash functions that take arbitrary-sized
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* data and output a fixed-length hash value.
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*
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* <p>A MessageDigest object starts out initialized. The data is
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* processed through it using the {@link #update(byte) update}
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* methods. At any point {@link #reset() reset} can be called
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* to reset the digest. Once all the data to be updated has been
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* updated, one of the {@link #digest() digest} methods should
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* be called to complete the hash computation.
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*
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* <p>The <code>digest</code> method can be called once for a given number
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* of updates. After <code>digest</code> has been called, the MessageDigest
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* object is reset to its initialized state.
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*
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* <p>Implementations are free to implement the Cloneable interface.
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* Client applications can test cloneability by attempting cloning
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* and catching the CloneNotSupportedException: <p>
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*
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* <pre>
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* MessageDigest md = MessageDigest.getInstance("SHA");
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*
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* try {
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* md.update(toChapter1);
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* MessageDigest tc1 = md.clone();
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* byte[] toChapter1Digest = tc1.digest();
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* md.update(toChapter2);
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* ...etc.
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* } catch (CloneNotSupportedException cnse) {
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* throw new DigestException("couldn't make digest of partial content");
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* }
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* </pre>
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*
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* <p>Note that if a given implementation is not cloneable, it is
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* still possible to compute intermediate digests by instantiating
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* several instances, if the number of digests is known in advance.
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*
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* <p>Note that this class is abstract and extends from
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* <code>MessageDigestSpi</code> for historical reasons.
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* Application developers should only take notice of the methods defined in
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* this <code>MessageDigest</code> class; all the methods in
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* the superclass are intended for cryptographic service providers who wish to
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* supply their own implementations of message digest algorithms.
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*
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* @author Benjamin Renaud
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*
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*
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* @see DigestInputStream
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* @see DigestOutputStream
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*/
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public abstract class MessageDigest extends MessageDigestSpi {
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private String algorithm;
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// The state of this digest
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private static final int INITIAL = 0;
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private static final int IN_PROGRESS = 1;
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private int state = INITIAL;
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// The provider
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private Provider provider;
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/**
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* Creates a message digest with the specified algorithm name.
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*
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* @param algorithm the standard name of the digest algorithm.
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* See Appendix A in the <a href=
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* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard algorithm names.
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*/
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protected MessageDigest(String algorithm) {
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this.algorithm = algorithm;
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}
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/**
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* Returns a MessageDigest object that implements the specified digest
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* algorithm.
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*
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* <p> This method traverses the list of registered security Providers,
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* starting with the most preferred Provider.
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* A new MessageDigest object encapsulating the
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* MessageDigestSpi implementation from the first
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* Provider that supports the specified algorithm is returned.
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*
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* <p> Note that the list of registered providers may be retrieved via
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* the {@link Security#getProviders() Security.getProviders()} method.
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*
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* @param algorithm the name of the algorithm requested.
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* See Appendix A in the <a href=
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* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard algorithm names.
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*
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* @return a Message Digest object that implements the specified algorithm.
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*
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* @exception NoSuchAlgorithmException if no Provider supports a
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* MessageDigestSpi implementation for the
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* specified algorithm.
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*
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* @see Provider
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*/
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public static MessageDigest getInstance(String algorithm)
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throws NoSuchAlgorithmException {
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try {
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Object[] objs = Security.getImpl(algorithm, "MessageDigest",
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(String)null);
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if (objs[0] instanceof MessageDigest) {
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MessageDigest md = (MessageDigest)objs[0];
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md.provider = (Provider)objs[1];
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return md;
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} else {
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MessageDigest delegate =
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new Delegate((MessageDigestSpi)objs[0], algorithm);
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delegate.provider = (Provider)objs[1];
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return delegate;
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}
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} catch(NoSuchProviderException e) {
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throw new NoSuchAlgorithmException(algorithm + " not found");
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}
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}
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/**
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* Returns a MessageDigest object that implements the specified digest
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* algorithm.
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*
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* <p> A new MessageDigest object encapsulating the
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* MessageDigestSpi implementation from the specified provider
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* is returned. The specified provider must be registered
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* in the security provider list.
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*
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* <p> Note that the list of registered providers may be retrieved via
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* the {@link Security#getProviders() Security.getProviders()} method.
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*
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* @param algorithm the name of the algorithm requested.
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* See Appendix A in the <a href=
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* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard algorithm names.
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*
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* @param provider the name of the provider.
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*
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* @return a MessageDigest object that implements the specified algorithm.
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*
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* @exception NoSuchAlgorithmException if a MessageDigestSpi
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* implementation for the specified algorithm is not
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* available from the specified provider.
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*
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* @exception NoSuchProviderException if the specified provider is not
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* registered in the security provider list.
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*
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* @exception IllegalArgumentException if the provider name is null
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* or empty.
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*
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* @see Provider
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*/
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public static MessageDigest getInstance(String algorithm, String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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if (provider == null || provider.length() == 0)
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throw new IllegalArgumentException("missing provider");
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Object[] objs = Security.getImpl(algorithm, "MessageDigest", provider);
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if (objs[0] instanceof MessageDigest) {
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MessageDigest md = (MessageDigest)objs[0];
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md.provider = (Provider)objs[1];
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return md;
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} else {
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MessageDigest delegate =
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new Delegate((MessageDigestSpi)objs[0], algorithm);
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delegate.provider = (Provider)objs[1];
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return delegate;
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}
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}
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/**
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* Returns a MessageDigest object that implements the specified digest
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* algorithm.
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*
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* <p> A new MessageDigest object encapsulating the
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* MessageDigestSpi implementation from the specified Provider
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* object is returned. Note that the specified Provider object
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* does not have to be registered in the provider list.
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*
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* @param algorithm the name of the algorithm requested.
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* See Appendix A in the <a href=
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* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard algorithm names.
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*
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* @param provider the provider.
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*
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* @return a MessageDigest object that implements the specified algorithm.
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*
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* @exception NoSuchAlgorithmException if a MessageDigestSpi
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* implementation for the specified algorithm is not available
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* from the specified Provider object.
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*
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* @exception IllegalArgumentException if the specified provider is null.
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*
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* @see Provider
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*
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* @since 1.4
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*/
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public static MessageDigest getInstance(String algorithm,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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if (provider == null)
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throw new IllegalArgumentException("missing provider");
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Object[] objs = Security.getImpl(algorithm, "MessageDigest", provider);
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if (objs[0] instanceof MessageDigest) {
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MessageDigest md = (MessageDigest)objs[0];
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md.provider = (Provider)objs[1];
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return md;
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} else {
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MessageDigest delegate =
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new Delegate((MessageDigestSpi)objs[0], algorithm);
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delegate.provider = (Provider)objs[1];
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return delegate;
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}
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}
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/**
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* Returns the provider of this message digest object.
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*
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* @return the provider of this message digest object
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*/
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public final Provider getProvider() {
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return this.provider;
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}
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/**
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* Updates the digest using the specified byte.
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*
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* @param input the byte with which to update the digest.
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*/
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public void update(byte input) {
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engineUpdate(input);
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state = IN_PROGRESS;
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}
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/**
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* Updates the digest using the specified array of bytes, starting
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* at the specified offset.
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*
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* @param input the array of bytes.
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*
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* @param offset the offset to start from in the array of bytes.
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*
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* @param len the number of bytes to use, starting at
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* <code>offset</code>.
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*/
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public void update(byte[] input, int offset, int len) {
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if (input == null) {
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throw new IllegalArgumentException("No input buffer given");
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}
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if (input.length - offset < len) {
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throw new IllegalArgumentException("Input buffer too short");
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}
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engineUpdate(input, offset, len);
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state = IN_PROGRESS;
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}
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/**
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* Updates the digest using the specified array of bytes.
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*
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* @param input the array of bytes.
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*/
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public void update(byte[] input) {
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engineUpdate(input, 0, input.length);
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state = IN_PROGRESS;
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}
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/**
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* Update the digest using the specified ByteBuffer. The digest is
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* updated using the <code>input.remaining()</code> bytes starting
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* at <code>input.position()</code>.
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* Upon return, the buffer's position will be equal to its limit;
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* its limit will not have changed.
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*
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* @param input the ByteBuffer
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* @since 1.5
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*/
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public final void update(ByteBuffer input) {
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if (input == null) {
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throw new NullPointerException();
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}
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engineUpdate(input);
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state = IN_PROGRESS;
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}
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/**
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* Completes the hash computation by performing final operations
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* such as padding. The digest is reset after this call is made.
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*
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* @return the array of bytes for the resulting hash value.
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*/
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public byte[] digest() {
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/* Resetting is the responsibility of implementors. */
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byte[] result = engineDigest();
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state = INITIAL;
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return result;
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}
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/**
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* Completes the hash computation by performing final operations
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* such as padding. The digest is reset after this call is made.
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*
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* @param buf output buffer for the computed digest
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*
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* @param offset offset into the output buffer to begin storing the digest
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*
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* @param len number of bytes within buf allotted for the digest
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*
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* @return the number of bytes placed into <code>buf</code>
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*
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* @exception DigestException if an error occurs.
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*/
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public int digest(byte[] buf, int offset, int len) throws DigestException {
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if (buf == null) {
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throw new IllegalArgumentException("No output buffer given");
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}
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if (buf.length - offset < len) {
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throw new IllegalArgumentException
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("Output buffer too small for specified offset and length");
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}
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int numBytes = engineDigest(buf, offset, len);
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state = INITIAL;
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return numBytes;
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}
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/**
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* Performs a final update on the digest using the specified array
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* of bytes, then completes the digest computation. That is, this
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* method first calls {@link #update(byte[]) update(input)},
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* passing the <i>input</i> array to the <code>update</code> method,
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* then calls {@link #digest() digest()}.
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*
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* @param input the input to be updated before the digest is
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* completed.
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*
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* @return the array of bytes for the resulting hash value.
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*/
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public byte[] digest(byte[] input) {
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update(input);
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return digest();
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}
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|
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/**
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* Returns a string representation of this message digest object.
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*/
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392 |
public String toString() {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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PrintStream p = new PrintStream(baos);
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p.print(algorithm+" Message Digest from "+provider.getName()+", ");
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switch (state) {
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case INITIAL:
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p.print("<initialized>");
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break;
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case IN_PROGRESS:
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p.print("<in progress>");
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break;
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}
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p.println();
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return (baos.toString());
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|
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}
|
|
407 |
|
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408 |
/**
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409 |
* Compares two digests for equality. Does a simple byte compare.
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*
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* @param digesta one of the digests to compare.
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|
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*
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* @param digestb the other digest to compare.
|
|
414 |
*
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415 |
* @return true if the digests are equal, false otherwise.
|
|
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*/
|
|
417 |
public static boolean isEqual(byte digesta[], byte digestb[]) {
|
|
418 |
if (digesta.length != digestb.length)
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|
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return false;
|
|
420 |
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421 |
for (int i = 0; i < digesta.length; i++) {
|
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422 |
if (digesta[i] != digestb[i]) {
|
|
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return false;
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|
424 |
}
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}
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|
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return true;
|
|
427 |
}
|
|
428 |
|
|
429 |
/**
|
|
430 |
* Resets the digest for further use.
|
|
431 |
*/
|
|
432 |
public void reset() {
|
|
433 |
engineReset();
|
|
434 |
state = INITIAL;
|
|
435 |
}
|
|
436 |
|
|
437 |
/**
|
|
438 |
* Returns a string that identifies the algorithm, independent of
|
|
439 |
* implementation details. The name should be a standard
|
|
440 |
* Java Security name (such as "SHA", "MD5", and so on).
|
|
441 |
* See Appendix A in the <a href=
|
|
442 |
* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
|
|
443 |
* Java Cryptography Architecture API Specification & Reference </a>
|
|
444 |
* for information about standard algorithm names.
|
|
445 |
*
|
|
446 |
* @return the name of the algorithm
|
|
447 |
*/
|
|
448 |
public final String getAlgorithm() {
|
|
449 |
return this.algorithm;
|
|
450 |
}
|
|
451 |
|
|
452 |
/**
|
|
453 |
* Returns the length of the digest in bytes, or 0 if this operation is
|
|
454 |
* not supported by the provider and the implementation is not cloneable.
|
|
455 |
*
|
|
456 |
* @return the digest length in bytes, or 0 if this operation is not
|
|
457 |
* supported by the provider and the implementation is not cloneable.
|
|
458 |
*
|
|
459 |
* @since 1.2
|
|
460 |
*/
|
|
461 |
public final int getDigestLength() {
|
|
462 |
int digestLen = engineGetDigestLength();
|
|
463 |
if (digestLen == 0) {
|
|
464 |
try {
|
|
465 |
MessageDigest md = (MessageDigest)clone();
|
|
466 |
byte[] digest = md.digest();
|
|
467 |
return digest.length;
|
|
468 |
} catch (CloneNotSupportedException e) {
|
|
469 |
return digestLen;
|
|
470 |
}
|
|
471 |
}
|
|
472 |
return digestLen;
|
|
473 |
}
|
|
474 |
|
|
475 |
/**
|
|
476 |
* Returns a clone if the implementation is cloneable.
|
|
477 |
*
|
|
478 |
* @return a clone if the implementation is cloneable.
|
|
479 |
*
|
|
480 |
* @exception CloneNotSupportedException if this is called on an
|
|
481 |
* implementation that does not support <code>Cloneable</code>.
|
|
482 |
*/
|
|
483 |
public Object clone() throws CloneNotSupportedException {
|
|
484 |
if (this instanceof Cloneable) {
|
|
485 |
return super.clone();
|
|
486 |
} else {
|
|
487 |
throw new CloneNotSupportedException();
|
|
488 |
}
|
|
489 |
}
|
|
490 |
|
|
491 |
|
|
492 |
|
|
493 |
|
|
494 |
/*
|
|
495 |
* The following class allows providers to extend from MessageDigestSpi
|
|
496 |
* rather than from MessageDigest. It represents a MessageDigest with an
|
|
497 |
* encapsulated, provider-supplied SPI object (of type MessageDigestSpi).
|
|
498 |
* If the provider implementation is an instance of MessageDigestSpi,
|
|
499 |
* the getInstance() methods above return an instance of this class, with
|
|
500 |
* the SPI object encapsulated.
|
|
501 |
*
|
|
502 |
* Note: All SPI methods from the original MessageDigest class have been
|
|
503 |
* moved up the hierarchy into a new class (MessageDigestSpi), which has
|
|
504 |
* been interposed in the hierarchy between the API (MessageDigest)
|
|
505 |
* and its original parent (Object).
|
|
506 |
*/
|
|
507 |
|
|
508 |
static class Delegate extends MessageDigest {
|
|
509 |
|
|
510 |
// The provider implementation (delegate)
|
|
511 |
private MessageDigestSpi digestSpi;
|
|
512 |
|
|
513 |
// constructor
|
|
514 |
public Delegate(MessageDigestSpi digestSpi, String algorithm) {
|
|
515 |
super(algorithm);
|
|
516 |
this.digestSpi = digestSpi;
|
|
517 |
}
|
|
518 |
|
|
519 |
/**
|
|
520 |
* Returns a clone if the delegate is cloneable.
|
|
521 |
*
|
|
522 |
* @return a clone if the delegate is cloneable.
|
|
523 |
*
|
|
524 |
* @exception CloneNotSupportedException if this is called on a
|
|
525 |
* delegate that does not support <code>Cloneable</code>.
|
|
526 |
*/
|
|
527 |
public Object clone() throws CloneNotSupportedException {
|
|
528 |
if (digestSpi instanceof Cloneable) {
|
|
529 |
MessageDigestSpi digestSpiClone =
|
|
530 |
(MessageDigestSpi)digestSpi.clone();
|
|
531 |
// Because 'algorithm', 'provider', and 'state' are private
|
|
532 |
// members of our supertype, we must perform a cast to
|
|
533 |
// access them.
|
|
534 |
MessageDigest that =
|
|
535 |
new Delegate(digestSpiClone,
|
|
536 |
((MessageDigest)this).algorithm);
|
|
537 |
that.provider = ((MessageDigest)this).provider;
|
|
538 |
that.state = ((MessageDigest)this).state;
|
|
539 |
return that;
|
|
540 |
} else {
|
|
541 |
throw new CloneNotSupportedException();
|
|
542 |
}
|
|
543 |
}
|
|
544 |
|
|
545 |
protected int engineGetDigestLength() {
|
|
546 |
return digestSpi.engineGetDigestLength();
|
|
547 |
}
|
|
548 |
|
|
549 |
protected void engineUpdate(byte input) {
|
|
550 |
digestSpi.engineUpdate(input);
|
|
551 |
}
|
|
552 |
|
|
553 |
protected void engineUpdate(byte[] input, int offset, int len) {
|
|
554 |
digestSpi.engineUpdate(input, offset, len);
|
|
555 |
}
|
|
556 |
|
|
557 |
protected void engineUpdate(ByteBuffer input) {
|
|
558 |
digestSpi.engineUpdate(input);
|
|
559 |
}
|
|
560 |
|
|
561 |
protected byte[] engineDigest() {
|
|
562 |
return digestSpi.engineDigest();
|
|
563 |
}
|
|
564 |
|
|
565 |
protected int engineDigest(byte[] buf, int offset, int len)
|
|
566 |
throws DigestException {
|
|
567 |
return digestSpi.engineDigest(buf, offset, len);
|
|
568 |
}
|
|
569 |
|
|
570 |
protected void engineReset() {
|
|
571 |
digestSpi.engineReset();
|
|
572 |
}
|
|
573 |
}
|
|
574 |
}
|