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-/* MessageDigestAdapter.java --
- Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
-
-This file is a part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or (at
-your option) any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; if not, write to the Free Software
-Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
-USA
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package gnu.java.security.jce.hash;
-
-import gnu.java.security.hash.IMessageDigest;
-import gnu.java.security.hash.HashFactory;
-
-import java.security.DigestException;
-import java.security.MessageDigestSpi;
-
-/**
- * The implementation of a generic {@link java.security.MessageDigest} adapter
- * class to wrap GNU hash instances.
- * <p>
- * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for
- * the {@link java.security.MessageDigest} class, which provides the
- * functionality of a message digest algorithm, such as MD5 or SHA. Message
- * digests are secure one-way hash functions that take arbitrary-sized data and
- * output a fixed-length hash value.
- * <p>
- * All the abstract methods in the {@link MessageDigestSpi} class are
- * implemented by this class and all its sub-classes.
- * <p>
- * All the implementations which subclass this object, and which are serviced by
- * the GNU provider implement the {@link Cloneable} interface.
- */
-class MessageDigestAdapter
- extends MessageDigestSpi
- implements Cloneable
-{
- /** Our underlying hash instance. */
- private IMessageDigest adaptee;
-
- /**
- * Trivial protected constructor.
- *
- * @param mdName the canonical name of the hash algorithm.
- */
- protected MessageDigestAdapter(String mdName)
- {
- this(HashFactory.getInstance(mdName));
- }
-
- /**
- * Private constructor for cloning purposes.
- *
- * @param adaptee a clone of the underlying hash algorithm instance.
- */
- private MessageDigestAdapter(IMessageDigest adaptee)
- {
- super();
-
- this.adaptee = adaptee;
- }
-
- public Object clone()
- {
- return new MessageDigestAdapter((IMessageDigest) adaptee.clone());
- }
-
- public int engineGetDigestLength()
- {
- return adaptee.hashSize();
- }
-
- public void engineUpdate(byte input)
- {
- adaptee.update(input);
- }
-
- public void engineUpdate(byte[] input, int offset, int len)
- {
- adaptee.update(input, offset, len);
- }
-
- public byte[] engineDigest()
- {
- return adaptee.digest();
- }
-
- public int engineDigest(byte[] buf, int offset, int len)
- throws DigestException
- {
- int result = adaptee.hashSize();
- if (len < result)
- throw new DigestException();
-
- byte[] md = adaptee.digest();
- System.arraycopy(md, 0, buf, offset, result);
- return result;
- }
-
- public void engineReset()
- {
- adaptee.reset();
- }
-}