mirror of git://gcc.gnu.org/git/gcc.git
137 lines
4.0 KiB
Java
137 lines
4.0 KiB
Java
/* MacAdapter.java --
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Copyright (C) 2002, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.jce.mac;
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import gnu.javax.crypto.mac.IMac;
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import gnu.javax.crypto.mac.MacFactory;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.spec.AlgorithmParameterSpec;
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import java.util.HashMap;
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import java.util.Map;
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import javax.crypto.MacSpi;
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/**
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* The implementation of a generic {@link javax.crypto.Mac} adapter class to
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* wrap GNU MAC instances.
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* <p>
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* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for
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* the {@link javax.crypto.Mac} class, which provides the functionality of a
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* message authentication code algorithm, such as the <i>Hashed Message
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* Authentication Code</i> (<b>HMAC</b>) algorithms.
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*/
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class MacAdapter
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extends MacSpi
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implements Cloneable
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{
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/** Our MAC instance. */
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protected IMac mac;
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/** Our MAC attributes. */
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protected Map attributes;
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/**
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* Creates a new Mac instance for the given name.
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*
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* @param name The name of the mac to create.
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*/
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protected MacAdapter(String name)
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{
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mac = MacFactory.getInstance(name);
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attributes = new HashMap();
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}
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/**
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* Private constructor for cloning purposes.
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*
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* @param mac a clone of the internal {@link IMac} instance.
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* @param attributes a clone of the current {@link Map} of attributes.
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*/
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private MacAdapter(IMac mac, Map attributes)
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{
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super();
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this.mac = mac;
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this.attributes = attributes;
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}
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public Object clone() throws CloneNotSupportedException
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{
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return new MacAdapter((IMac) mac.clone(), new HashMap(attributes));
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}
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protected byte[] engineDoFinal()
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{
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byte[] result = mac.digest();
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engineReset();
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return result;
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}
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protected int engineGetMacLength()
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{
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return mac.macSize();
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}
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protected void engineInit(Key key, AlgorithmParameterSpec params)
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throws InvalidKeyException, InvalidAlgorithmParameterException
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{
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if (! key.getFormat().equalsIgnoreCase("RAW"))
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throw new InvalidKeyException("unknown key format " + key.getFormat());
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attributes.put(IMac.MAC_KEY_MATERIAL, key.getEncoded());
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mac.reset();
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mac.init(attributes);
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}
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protected void engineReset()
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{
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mac.reset();
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}
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protected void engineUpdate(byte b)
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{
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mac.update(b);
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}
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protected void engineUpdate(byte[] in, int off, int len)
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{
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mac.update(in, off, len);
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}
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}
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