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jeremybenn |
/* MessageDigestAdapter.java --
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Copyright (C) 2001, 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.java.security.jce.hash;
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import gnu.java.security.hash.IMessageDigest;
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import gnu.java.security.hash.HashFactory;
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import java.security.DigestException;
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import java.security.MessageDigestSpi;
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/**
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* The implementation of a generic {@link java.security.MessageDigest} adapter
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* class to wrap GNU hash 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 java.security.MessageDigest} class, which provides the
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* functionality of a message digest algorithm, such as MD5 or SHA. Message
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* digests are secure one-way hash functions that take arbitrary-sized data and
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* output a fixed-length hash value.
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* <p>
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* All the abstract methods in the {@link MessageDigestSpi} class are
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* implemented by this class and all its sub-classes.
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* <p>
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* All the implementations which subclass this object, and which are serviced by
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* the GNU provider implement the {@link Cloneable} interface.
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*/
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class MessageDigestAdapter
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extends MessageDigestSpi
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implements Cloneable
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{
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/** Our underlying hash instance. */
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private IMessageDigest adaptee;
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/**
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* Trivial protected constructor.
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*
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* @param mdName the canonical name of the hash algorithm.
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*/
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protected MessageDigestAdapter(String mdName)
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{
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this(HashFactory.getInstance(mdName));
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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 adaptee a clone of the underlying hash algorithm instance.
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*/
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private MessageDigestAdapter(IMessageDigest adaptee)
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{
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super();
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this.adaptee = adaptee;
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}
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public Object clone()
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{
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return new MessageDigestAdapter((IMessageDigest) adaptee.clone());
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}
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public int engineGetDigestLength()
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{
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return adaptee.hashSize();
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}
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public void engineUpdate(byte input)
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{
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adaptee.update(input);
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}
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public void engineUpdate(byte[] input, int offset, int len)
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{
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adaptee.update(input, offset, len);
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}
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public byte[] engineDigest()
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{
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return adaptee.digest();
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}
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public int engineDigest(byte[] buf, int offset, int len)
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throws DigestException
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{
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int result = adaptee.hashSize();
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if (len < result)
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throw new DigestException();
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byte[] md = adaptee.digest();
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System.arraycopy(md, 0, buf, offset, result);
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return result;
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}
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public void engineReset()
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{
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adaptee.reset();
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}
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}
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