| /* NullCipherImpl.java -- implementation of NullCipher. |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is 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, 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; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, 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 javax.crypto; |
| |
| import java.security.AlgorithmParameters; |
| import java.security.Key; |
| import java.security.SecureRandom; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| * Implementation of the identity cipher. |
| */ |
| final class NullCipherImpl extends CipherSpi |
| { |
| |
| // Constructor. |
| // ------------------------------------------------------------------------- |
| |
| NullCipherImpl() |
| { |
| super(); |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------- |
| |
| protected void engineSetMode(String mode) { } |
| protected void engineSetPadding(String padding) { } |
| |
| protected int engineGetBlockSize() |
| { |
| return 1; |
| } |
| |
| protected int engineGetOutputSize(int inputLen) |
| { |
| return inputLen; |
| } |
| |
| protected byte[] engineGetIV() |
| { |
| return null; |
| } |
| |
| protected AlgorithmParameters engineGetParameters() |
| { |
| return null; |
| } |
| |
| protected void engineInit(int mode, Key key, SecureRandom random) { } |
| protected void engineInit(int mode, Key key, AlgorithmParameterSpec spec, SecureRandom random) { } |
| protected void engineInit(int mode, Key key, AlgorithmParameters params, SecureRandom random) { } |
| |
| protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) |
| { |
| if (input == null) |
| return new byte[0]; |
| if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length) |
| throw new ArrayIndexOutOfBoundsException(); |
| byte[] output = new byte[inputLen]; |
| System.arraycopy(input, inputOffset, output, 0, inputLen); |
| return output; |
| } |
| |
| protected int engineUpdate(byte[] input, int inputOffset, int inputLen, |
| byte[] output, int outputOffset) |
| throws ShortBufferException |
| { |
| if (input == null) |
| return 0; |
| if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length |
| || outputOffset < 0) |
| throw new ArrayIndexOutOfBoundsException(); |
| if (output.length - outputOffset < inputLen) |
| throw new ShortBufferException(); |
| System.arraycopy(input, inputOffset, output, outputOffset, inputLen); |
| return inputLen; |
| } |
| |
| protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) |
| { |
| return engineUpdate(input, inputOffset, inputLen); |
| } |
| |
| protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, |
| byte[] output, int outputOffset) |
| throws ShortBufferException |
| { |
| return engineUpdate(input, inputOffset, inputLen, output, outputOffset); |
| } |
| } |