| /* MacAdapter.java -- |
| Copyright (C) 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.jce.mac; |
| |
| import gnu.javax.crypto.mac.IMac; |
| import gnu.javax.crypto.mac.MacFactory; |
| |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.InvalidKeyException; |
| import java.security.Key; |
| import java.security.spec.AlgorithmParameterSpec; |
| import java.util.HashMap; |
| import java.util.Map; |
| import javax.crypto.MacSpi; |
| |
| /** |
| * The implementation of a generic {@link javax.crypto.Mac} adapter class to |
| * wrap GNU MAC instances. |
| * <p> |
| * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for |
| * the {@link javax.crypto.Mac} class, which provides the functionality of a |
| * message authentication code algorithm, such as the <i>Hashed Message |
| * Authentication Code</i> (<b>HMAC</b>) algorithms. |
| */ |
| class MacAdapter |
| extends MacSpi |
| implements Cloneable |
| { |
| /** Our MAC instance. */ |
| protected IMac mac; |
| /** Our MAC attributes. */ |
| protected Map attributes; |
| |
| /** |
| * Creates a new Mac instance for the given name. |
| * |
| * @param name The name of the mac to create. |
| */ |
| protected MacAdapter(String name) |
| { |
| mac = MacFactory.getInstance(name); |
| attributes = new HashMap(); |
| } |
| |
| /** |
| * Private constructor for cloning purposes. |
| * |
| * @param mac a clone of the internal {@link IMac} instance. |
| * @param attributes a clone of the current {@link Map} of attributes. |
| */ |
| private MacAdapter(IMac mac, Map attributes) |
| { |
| super(); |
| |
| this.mac = mac; |
| this.attributes = attributes; |
| } |
| |
| public Object clone() throws CloneNotSupportedException |
| { |
| return new MacAdapter((IMac) mac.clone(), new HashMap(attributes)); |
| } |
| |
| protected byte[] engineDoFinal() |
| { |
| byte[] result = mac.digest(); |
| engineReset(); |
| return result; |
| } |
| |
| protected int engineGetMacLength() |
| { |
| return mac.macSize(); |
| } |
| |
| protected void engineInit(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException |
| { |
| if (! key.getFormat().equalsIgnoreCase("RAW")) |
| throw new InvalidKeyException("unknown key format " + key.getFormat()); |
| attributes.put(IMac.MAC_KEY_MATERIAL, key.getEncoded()); |
| mac.reset(); |
| mac.init(attributes); |
| } |
| |
| protected void engineReset() |
| { |
| mac.reset(); |
| } |
| |
| protected void engineUpdate(byte b) |
| { |
| mac.update(b); |
| } |
| |
| protected void engineUpdate(byte[] in, int off, int len) |
| { |
| mac.update(in, off, len); |
| } |
| } |