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