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/*
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* Copyright (c) 1998, 2007, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.crypto;
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import java.util.*;
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import java.security.*;
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import java.security.Provider.Service;
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import java.security.spec.AlgorithmParameterSpec;
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import java.nio.ByteBuffer;
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import sun.security.util.Debug;
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import sun.security.jca.*;
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import sun.security.jca.GetInstance.Instance;
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/**
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* This class provides the functionality of a "Message Authentication Code"
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* (MAC) algorithm.
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*
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* <p> A MAC provides a way to check
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* the integrity of information transmitted over or stored in an unreliable
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* medium, based on a secret key. Typically, message
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* authentication codes are used between two parties that share a secret
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* key in order to validate information transmitted between these
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* parties.
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*
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* <p> A MAC mechanism that is based on cryptographic hash functions is
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* referred to as HMAC. HMAC can be used with any cryptographic hash function,
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* e.g., MD5 or SHA-1, in combination with a secret shared key. HMAC is
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* specified in RFC 2104.
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*
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* @author Jan Luehe
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*
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* @since 1.4
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*/
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public class Mac implements Cloneable {
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private static final Debug debug =
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Debug.getInstance("jca", "Mac");
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// The provider
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private Provider provider;
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// The provider implementation (delegate)
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private MacSpi spi;
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// The name of the MAC algorithm.
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private final String algorithm;
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// Has this object been initialized?
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private boolean initialized = false;
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// next service to try in provider selection
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// null once provider is selected
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private Service firstService;
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// remaining services to try in provider selection
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// null once provider is selected
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private Iterator serviceIterator;
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private final Object lock;
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/**
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* Creates a MAC object.
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*
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* @param macSpi the delegate
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* @param provider the provider
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* @param algorithm the algorithm
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*/
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protected Mac(MacSpi macSpi, Provider provider, String algorithm) {
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this.spi = macSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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serviceIterator = null;
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lock = null;
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}
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private Mac(Service s, Iterator t, String algorithm) {
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firstService = s;
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serviceIterator = t;
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this.algorithm = algorithm;
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lock = new Object();
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}
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/**
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* Returns the algorithm name of this <code>Mac</code> object.
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*
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* <p>This is the same name that was specified in one of the
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* <code>getInstance</code> calls that created this
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* <code>Mac</code> object.
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*
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* @return the algorithm name of this <code>Mac</code> object.
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*/
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public final String getAlgorithm() {
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return this.algorithm;
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}
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/**
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* Returns a <code>Mac</code> object that implements the
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* specified MAC 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 Mac object encapsulating the
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* MacSpi 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 standard name of the requested MAC algorithm.
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* See Appendix A in the <a href=
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* "{@docRoot}/../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture Reference Guide</a>
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* for information about standard algorithm names.
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*
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* @return the new <code>Mac</code> object.
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*
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* @exception NoSuchAlgorithmException if no Provider supports a
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* MacSpi implementation for the
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* specified algorithm.
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*
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* @see java.security.Provider
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*/
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public static final Mac getInstance(String algorithm)
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throws NoSuchAlgorithmException {
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List services = GetInstance.getServices("Mac", algorithm);
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// make sure there is at least one service from a signed provider
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Iterator t = services.iterator();
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while (t.hasNext()) {
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Service s = (Service)t.next();
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if (JceSecurity.canUseProvider(s.getProvider()) == false) {
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continue;
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}
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return new Mac(s, t, algorithm);
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}
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throw new NoSuchAlgorithmException
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("Algorithm " + algorithm + " not available");
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}
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/**
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* Returns a <code>Mac</code> object that implements the
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* specified MAC algorithm.
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*
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* <p> A new Mac object encapsulating the
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* MacSpi 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 standard name of the requested MAC algorithm.
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* See Appendix A in the <a href=
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* "{@docRoot}/../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture Reference Guide</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 the new <code>Mac</code> object.
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*
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* @exception NoSuchAlgorithmException if a MacSpi
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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 <code>provider</code>
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* is null or empty.
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*
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* @see java.security.Provider
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*/
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public static final Mac getInstance(String algorithm, String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException {
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Instance instance = JceSecurity.getInstance
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("Mac", MacSpi.class, algorithm, provider);
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return new Mac((MacSpi)instance.impl, instance.provider, algorithm);
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}
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/**
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* Returns a <code>Mac</code> object that implements the
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* specified MAC algorithm.
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*
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* <p> A new Mac object encapsulating the
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* MacSpi 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 standard name of the requested MAC algorithm.
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* See Appendix A in the <a href=
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* "{@docRoot}/../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture Reference Guide</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 the new <code>Mac</code> object.
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*
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* @exception NoSuchAlgorithmException if a MacSpi
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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 <code>provider</code>
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* is null.
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*
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* @see java.security.Provider
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*/
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public static final Mac getInstance(String algorithm, Provider provider)
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throws NoSuchAlgorithmException {
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Instance instance = JceSecurity.getInstance
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("Mac", MacSpi.class, algorithm, provider);
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return new Mac((MacSpi)instance.impl, instance.provider, algorithm);
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}
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// max number of debug warnings to print from chooseFirstProvider()
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private static int warnCount = 10;
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/**
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* Choose the Spi from the first provider available. Used if
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* delayed provider selection is not possible because init()
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* is not the first method called.
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*/
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void chooseFirstProvider() {
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if ((spi != null) || (serviceIterator == null)) {
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return;
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}
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synchronized (lock) {
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if (spi != null) {
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return;
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}
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if (debug != null) {
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int w = --warnCount;
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if (w >= 0) {
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debug.println("Mac.init() not first method "
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+ "called, disabling delayed provider selection");
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if (w == 0) {
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debug.println("Further warnings of this type will "
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+ "be suppressed");
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}
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new Exception("Call trace").printStackTrace();
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}
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}
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Exception lastException = null;
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while ((firstService != null) || serviceIterator.hasNext()) {
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Service s;
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if (firstService != null) {
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s = firstService;
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firstService = null;
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} else {
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s = (Service)serviceIterator.next();
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}
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if (JceSecurity.canUseProvider(s.getProvider()) == false) {
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continue;
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}
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try {
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Object obj = s.newInstance(null);
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if (obj instanceof MacSpi == false) {
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continue;
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}
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spi = (MacSpi)obj;
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provider = s.getProvider();
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// not needed any more
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firstService = null;
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serviceIterator = null;
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return;
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} catch (NoSuchAlgorithmException e) {
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lastException = e;
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}
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}
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ProviderException e = new ProviderException
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("Could not construct MacSpi instance");
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if (lastException != null) {
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e.initCause(lastException);
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}
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throw e;
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}
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}
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private void chooseProvider(Key key, AlgorithmParameterSpec params)
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throws InvalidKeyException, InvalidAlgorithmParameterException {
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synchronized (lock) {
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if (spi != null) {
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spi.engineInit(key, params);
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return;
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}
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Exception lastException = null;
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while ((firstService != null) || serviceIterator.hasNext()) {
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Service s;
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if (firstService != null) {
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s = firstService;
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firstService = null;
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} else {
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s = (Service)serviceIterator.next();
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}
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// if provider says it does not support this key, ignore it
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if (s.supportsParameter(key) == false) {
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continue;
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}
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if (JceSecurity.canUseProvider(s.getProvider()) == false) {
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continue;
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}
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try {
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MacSpi spi = (MacSpi)s.newInstance(null);
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spi.engineInit(key, params);
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provider = s.getProvider();
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this.spi = spi;
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firstService = null;
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serviceIterator = null;
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return;
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} catch (Exception e) {
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// NoSuchAlgorithmException from newInstance()
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// InvalidKeyException from init()
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// RuntimeException (ProviderException) from init()
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if (lastException == null) {
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lastException = e;
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}
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}
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}
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// no working provider found, fail
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if (lastException instanceof InvalidKeyException) {
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throw (InvalidKeyException)lastException;
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}
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if (lastException instanceof InvalidAlgorithmParameterException) {
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throw (InvalidAlgorithmParameterException)lastException;
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}
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if (lastException instanceof RuntimeException) {
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throw (RuntimeException)lastException;
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}
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String kName = (key != null) ? key.getClass().getName() : "(null)";
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throw new InvalidKeyException
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("No installed provider supports this key: "
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+ kName, lastException);
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}
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}
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/**
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* Returns the provider of this <code>Mac</code> object.
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*
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* @return the provider of this <code>Mac</code> object.
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*/
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public final Provider getProvider() {
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chooseFirstProvider();
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return this.provider;
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}
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/**
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* Returns the length of the MAC in bytes.
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*
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* @return the MAC length in bytes.
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*/
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public final int getMacLength() {
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chooseFirstProvider();
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return spi.engineGetMacLength();
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}
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/**
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* Initializes this <code>Mac</code> object with the given key.
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*
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* @param key the key.
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*
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* @exception InvalidKeyException if the given key is inappropriate for
|
|
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* initializing this MAC.
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*/
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public final void init(Key key) throws InvalidKeyException {
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try {
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if (spi != null) {
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spi.engineInit(key, null);
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} else {
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chooseProvider(key, null);
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}
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|
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} catch (InvalidAlgorithmParameterException e) {
|
|
399 |
throw new InvalidKeyException("init() failed", e);
|
|
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}
|
|
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initialized = true;
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|
402 |
}
|
|
403 |
|
|
404 |
/**
|
|
405 |
* Initializes this <code>Mac</code> object with the given key and
|
|
406 |
* algorithm parameters.
|
|
407 |
*
|
|
408 |
* @param key the key.
|
|
409 |
* @param params the algorithm parameters.
|
|
410 |
*
|
|
411 |
* @exception InvalidKeyException if the given key is inappropriate for
|
|
412 |
* initializing this MAC.
|
|
413 |
* @exception InvalidAlgorithmParameterException if the given algorithm
|
|
414 |
* parameters are inappropriate for this MAC.
|
|
415 |
*/
|
|
416 |
public final void init(Key key, AlgorithmParameterSpec params)
|
|
417 |
throws InvalidKeyException, InvalidAlgorithmParameterException {
|
|
418 |
if (spi != null) {
|
|
419 |
spi.engineInit(key, params);
|
|
420 |
} else {
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|
421 |
chooseProvider(key, params);
|
|
422 |
}
|
|
423 |
initialized = true;
|
|
424 |
}
|
|
425 |
|
|
426 |
/**
|
|
427 |
* Processes the given byte.
|
|
428 |
*
|
|
429 |
* @param input the input byte to be processed.
|
|
430 |
*
|
|
431 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
432 |
* initialized.
|
|
433 |
*/
|
|
434 |
public final void update(byte input) throws IllegalStateException {
|
|
435 |
chooseFirstProvider();
|
|
436 |
if (initialized == false) {
|
|
437 |
throw new IllegalStateException("MAC not initialized");
|
|
438 |
}
|
|
439 |
spi.engineUpdate(input);
|
|
440 |
}
|
|
441 |
|
|
442 |
/**
|
|
443 |
* Processes the given array of bytes.
|
|
444 |
*
|
|
445 |
* @param input the array of bytes to be processed.
|
|
446 |
*
|
|
447 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
448 |
* initialized.
|
|
449 |
*/
|
|
450 |
public final void update(byte[] input) throws IllegalStateException {
|
|
451 |
chooseFirstProvider();
|
|
452 |
if (initialized == false) {
|
|
453 |
throw new IllegalStateException("MAC not initialized");
|
|
454 |
}
|
|
455 |
if (input != null) {
|
|
456 |
spi.engineUpdate(input, 0, input.length);
|
|
457 |
}
|
|
458 |
}
|
|
459 |
|
|
460 |
/**
|
|
461 |
* Processes the first <code>len</code> bytes in <code>input</code>,
|
|
462 |
* starting at <code>offset</code> inclusive.
|
|
463 |
*
|
|
464 |
* @param input the input buffer.
|
|
465 |
* @param offset the offset in <code>input</code> where the input starts.
|
|
466 |
* @param len the number of bytes to process.
|
|
467 |
*
|
|
468 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
469 |
* initialized.
|
|
470 |
*/
|
|
471 |
public final void update(byte[] input, int offset, int len)
|
|
472 |
throws IllegalStateException {
|
|
473 |
chooseFirstProvider();
|
|
474 |
if (initialized == false) {
|
|
475 |
throw new IllegalStateException("MAC not initialized");
|
|
476 |
}
|
|
477 |
|
|
478 |
if (input != null) {
|
|
479 |
if ((offset < 0) || (len > (input.length - offset)) || (len < 0))
|
|
480 |
throw new IllegalArgumentException("Bad arguments");
|
|
481 |
spi.engineUpdate(input, offset, len);
|
|
482 |
}
|
|
483 |
}
|
|
484 |
|
|
485 |
/**
|
|
486 |
* Processes <code>input.remaining()</code> bytes in the ByteBuffer
|
|
487 |
* <code>input</code>, starting at <code>input.position()</code>.
|
|
488 |
* Upon return, the buffer's position will be equal to its limit;
|
|
489 |
* its limit will not have changed.
|
|
490 |
*
|
|
491 |
* @param input the ByteBuffer
|
|
492 |
*
|
|
493 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
494 |
* initialized.
|
|
495 |
* @since 1.5
|
|
496 |
*/
|
|
497 |
public final void update(ByteBuffer input) {
|
|
498 |
chooseFirstProvider();
|
|
499 |
if (initialized == false) {
|
|
500 |
throw new IllegalStateException("MAC not initialized");
|
|
501 |
}
|
|
502 |
if (input == null) {
|
|
503 |
throw new IllegalArgumentException("Buffer must not be null");
|
|
504 |
}
|
|
505 |
spi.engineUpdate(input);
|
|
506 |
}
|
|
507 |
|
|
508 |
/**
|
|
509 |
* Finishes the MAC operation.
|
|
510 |
*
|
|
511 |
* <p>A call to this method resets this <code>Mac</code> object to the
|
|
512 |
* state it was in when previously initialized via a call to
|
|
513 |
* <code>init(Key)</code> or
|
|
514 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
515 |
* That is, the object is reset and available to generate another MAC from
|
|
516 |
* the same key, if desired, via new calls to <code>update</code> and
|
|
517 |
* <code>doFinal</code>.
|
|
518 |
* (In order to reuse this <code>Mac</code> object with a different key,
|
|
519 |
* it must be reinitialized via a call to <code>init(Key)</code> or
|
|
520 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
521 |
*
|
|
522 |
* @return the MAC result.
|
|
523 |
*
|
|
524 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
525 |
* initialized.
|
|
526 |
*/
|
|
527 |
public final byte[] doFinal() throws IllegalStateException {
|
|
528 |
chooseFirstProvider();
|
|
529 |
if (initialized == false) {
|
|
530 |
throw new IllegalStateException("MAC not initialized");
|
|
531 |
}
|
|
532 |
byte[] mac = spi.engineDoFinal();
|
|
533 |
spi.engineReset();
|
|
534 |
return mac;
|
|
535 |
}
|
|
536 |
|
|
537 |
/**
|
|
538 |
* Finishes the MAC operation.
|
|
539 |
*
|
|
540 |
* <p>A call to this method resets this <code>Mac</code> object to the
|
|
541 |
* state it was in when previously initialized via a call to
|
|
542 |
* <code>init(Key)</code> or
|
|
543 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
544 |
* That is, the object is reset and available to generate another MAC from
|
|
545 |
* the same key, if desired, via new calls to <code>update</code> and
|
|
546 |
* <code>doFinal</code>.
|
|
547 |
* (In order to reuse this <code>Mac</code> object with a different key,
|
|
548 |
* it must be reinitialized via a call to <code>init(Key)</code> or
|
|
549 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
550 |
*
|
|
551 |
* <p>The MAC result is stored in <code>output</code>, starting at
|
|
552 |
* <code>outOffset</code> inclusive.
|
|
553 |
*
|
|
554 |
* @param output the buffer where the MAC result is stored
|
|
555 |
* @param outOffset the offset in <code>output</code> where the MAC is
|
|
556 |
* stored
|
|
557 |
*
|
|
558 |
* @exception ShortBufferException if the given output buffer is too small
|
|
559 |
* to hold the result
|
|
560 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
561 |
* initialized.
|
|
562 |
*/
|
|
563 |
public final void doFinal(byte[] output, int outOffset)
|
|
564 |
throws ShortBufferException, IllegalStateException
|
|
565 |
{
|
|
566 |
chooseFirstProvider();
|
|
567 |
if (initialized == false) {
|
|
568 |
throw new IllegalStateException("MAC not initialized");
|
|
569 |
}
|
|
570 |
int macLen = getMacLength();
|
|
571 |
if (output == null || output.length-outOffset < macLen) {
|
|
572 |
throw new ShortBufferException
|
|
573 |
("Cannot store MAC in output buffer");
|
|
574 |
}
|
|
575 |
byte[] mac = doFinal();
|
|
576 |
System.arraycopy(mac, 0, output, outOffset, macLen);
|
|
577 |
return;
|
|
578 |
}
|
|
579 |
|
|
580 |
/**
|
|
581 |
* Processes the given array of bytes and finishes the MAC operation.
|
|
582 |
*
|
|
583 |
* <p>A call to this method resets this <code>Mac</code> object to the
|
|
584 |
* state it was in when previously initialized via a call to
|
|
585 |
* <code>init(Key)</code> or
|
|
586 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
587 |
* That is, the object is reset and available to generate another MAC from
|
|
588 |
* the same key, if desired, via new calls to <code>update</code> and
|
|
589 |
* <code>doFinal</code>.
|
|
590 |
* (In order to reuse this <code>Mac</code> object with a different key,
|
|
591 |
* it must be reinitialized via a call to <code>init(Key)</code> or
|
|
592 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
593 |
*
|
|
594 |
* @param input data in bytes
|
|
595 |
* @return the MAC result.
|
|
596 |
*
|
|
597 |
* @exception IllegalStateException if this <code>Mac</code> has not been
|
|
598 |
* initialized.
|
|
599 |
*/
|
|
600 |
public final byte[] doFinal(byte[] input) throws IllegalStateException
|
|
601 |
{
|
|
602 |
chooseFirstProvider();
|
|
603 |
if (initialized == false) {
|
|
604 |
throw new IllegalStateException("MAC not initialized");
|
|
605 |
}
|
|
606 |
update(input);
|
|
607 |
return doFinal();
|
|
608 |
}
|
|
609 |
|
|
610 |
/**
|
|
611 |
* Resets this <code>Mac</code> object.
|
|
612 |
*
|
|
613 |
* <p>A call to this method resets this <code>Mac</code> object to the
|
|
614 |
* state it was in when previously initialized via a call to
|
|
615 |
* <code>init(Key)</code> or
|
|
616 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
617 |
* That is, the object is reset and available to generate another MAC from
|
|
618 |
* the same key, if desired, via new calls to <code>update</code> and
|
|
619 |
* <code>doFinal</code>.
|
|
620 |
* (In order to reuse this <code>Mac</code> object with a different key,
|
|
621 |
* it must be reinitialized via a call to <code>init(Key)</code> or
|
|
622 |
* <code>init(Key, AlgorithmParameterSpec)</code>.
|
|
623 |
*/
|
|
624 |
public final void reset() {
|
|
625 |
chooseFirstProvider();
|
|
626 |
spi.engineReset();
|
|
627 |
}
|
|
628 |
|
|
629 |
/**
|
|
630 |
* Returns a clone if the provider implementation is cloneable.
|
|
631 |
*
|
|
632 |
* @return a clone if the provider implementation is cloneable.
|
|
633 |
*
|
|
634 |
* @exception CloneNotSupportedException if this is called on a
|
|
635 |
* delegate that does not support <code>Cloneable</code>.
|
|
636 |
*/
|
|
637 |
public final Object clone() throws CloneNotSupportedException {
|
|
638 |
chooseFirstProvider();
|
|
639 |
Mac that = (Mac)super.clone();
|
|
640 |
that.spi = (MacSpi)this.spi.clone();
|
|
641 |
return that;
|
|
642 |
}
|
|
643 |
}
|