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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/assembly/ModeStage.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/assembly/ModeStage.java | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/assembly/ModeStage.java b/libjava/classpath/gnu/javax/crypto/assembly/ModeStage.java new file mode 100644 index 000000000..8bdbef7c4 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/assembly/ModeStage.java @@ -0,0 +1,112 @@ +/* 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(); + } +} |