| /* ModeStage.java -- |
| Copyright (C) 2003, 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.assembly; |
| |
| import gnu.javax.crypto.mode.IMode; |
| |
| import java.security.InvalidKeyException; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * An {@link IMode} {@link Stage} in a {@link Cascade} Cipher chain. |
| * <p> |
| * Such a stage wraps an implementation of a Block Cipher Mode of Operation |
| * ({@link IMode}) to allow inclusion of such an instance in a cascade of block |
| * ciphers. |
| */ |
| class ModeStage |
| extends Stage |
| { |
| private IMode delegate; |
| |
| private transient Set cachedBlockSizes; |
| |
| ModeStage(IMode mode, Direction forwardDirection) |
| { |
| super(forwardDirection); |
| |
| delegate = mode; |
| cachedBlockSizes = null; |
| } |
| |
| public Set blockSizes() |
| { |
| if (cachedBlockSizes == null) |
| { |
| HashSet result = new HashSet(); |
| for (Iterator it = delegate.blockSizes(); it.hasNext();) |
| result.add(it.next()); |
| cachedBlockSizes = Collections.unmodifiableSet(result); |
| } |
| return cachedBlockSizes; |
| } |
| |
| void initDelegate(Map attributes) throws InvalidKeyException |
| { |
| Direction flow = (Direction) attributes.get(DIRECTION); |
| attributes.put(IMode.STATE, |
| Integer.valueOf(flow.equals(forward) ? IMode.ENCRYPTION |
| : IMode.DECRYPTION)); |
| delegate.init(attributes); |
| } |
| |
| public int currentBlockSize() throws IllegalStateException |
| { |
| return delegate.currentBlockSize(); |
| } |
| |
| void resetDelegate() |
| { |
| delegate.reset(); |
| } |
| |
| void updateDelegate(byte[] in, int inOffset, byte[] out, int outOffset) |
| { |
| delegate.update(in, inOffset, out, outOffset); |
| } |
| |
| public boolean selfTest() |
| { |
| return delegate.selfTest(); |
| } |
| } |