mirror of git://gcc.gnu.org/git/gcc.git
128 lines
3.6 KiB
Java
128 lines
3.6 KiB
Java
/* BaseMac.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.javax.crypto.mac;
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import gnu.java.security.hash.IMessageDigest;
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import java.security.InvalidKeyException;
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import java.util.Map;
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/**
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* A base abstract class to facilitate <i>MAC</i> (Message Authentication Code)
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* implementations.
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*/
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public abstract class BaseMac
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implements IMac
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{
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/** The canonical name prefix of the <i>MAC</i>. */
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protected String name;
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/** Reference to the underlying hash algorithm instance. */
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protected IMessageDigest underlyingHash;
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/** The length of the truncated output in bytes. */
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protected int truncatedSize;
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/**
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* Trivial constructor for use by concrete subclasses.
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*
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* @param name the canonical name of this instance.
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*/
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protected BaseMac(String name)
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{
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super();
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this.name = name;
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}
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/**
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* Trivial constructor for use by concrete subclasses.
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*
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* @param name the canonical name of this instance.
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* @param underlyingHash the underlying message digest algorithm instance.
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*/
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protected BaseMac(String name, IMessageDigest underlyingHash)
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{
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this(name);
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if (underlyingHash != null)
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truncatedSize = underlyingHash.hashSize();
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this.underlyingHash = underlyingHash;
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}
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public String name()
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{
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return name;
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}
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public int macSize()
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{
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return truncatedSize;
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}
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public void update(byte b)
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{
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underlyingHash.update(b);
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}
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public void update(byte[] b, int offset, int len)
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{
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underlyingHash.update(b, offset, len);
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}
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public void reset()
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{
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underlyingHash.reset();
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}
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public Object clone() throws CloneNotSupportedException
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{
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BaseMac result = (BaseMac) super.clone();
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if (this.underlyingHash != null)
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result.underlyingHash = (IMessageDigest) this.underlyingHash.clone();
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return result;
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}
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public abstract void init(Map attributes) throws InvalidKeyException,
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IllegalStateException;
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public abstract byte[] digest();
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public abstract boolean selfTest();
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}
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