128 lines
4.2 KiB
Java
128 lines
4.2 KiB
Java
/* NullCipherImpl.java -- implementation of NullCipher.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.crypto;
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import java.security.AlgorithmParameters;
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import java.security.Key;
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import java.security.SecureRandom;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* Implementation of the identity cipher.
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*/
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final class NullCipherImpl extends CipherSpi
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{
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// Constructor.
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// -------------------------------------------------------------------------
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NullCipherImpl()
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{
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super();
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}
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// Instance methods.
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// -------------------------------------------------------------------------
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protected void engineSetMode(String mode) { }
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protected void engineSetPadding(String padding) { }
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protected int engineGetBlockSize()
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{
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return 1;
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}
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protected int engineGetOutputSize(int inputLen)
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{
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return inputLen;
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}
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protected byte[] engineGetIV()
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{
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return null;
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}
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protected AlgorithmParameters engineGetParameters()
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{
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return null;
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}
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protected void engineInit(int mode, Key key, SecureRandom random) { }
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protected void engineInit(int mode, Key key, AlgorithmParameterSpec spec, SecureRandom random) { }
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protected void engineInit(int mode, Key key, AlgorithmParameters params, SecureRandom random) { }
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protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
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{
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if (input == null)
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return new byte[0];
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if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length)
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throw new ArrayIndexOutOfBoundsException();
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byte[] output = new byte[inputLen];
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System.arraycopy(input, inputOffset, output, 0, inputLen);
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return output;
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}
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protected int engineUpdate(byte[] input, int inputOffset, int inputLen,
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byte[] output, int outputOffset)
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throws ShortBufferException
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{
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if (input == null)
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return 0;
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if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length
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|| outputOffset < 0)
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throw new ArrayIndexOutOfBoundsException();
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if (output.length - outputOffset < inputLen)
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throw new ShortBufferException();
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System.arraycopy(input, inputOffset, output, outputOffset, inputLen);
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return inputLen;
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}
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protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
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{
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return engineUpdate(input, inputOffset, inputLen);
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}
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protected int engineDoFinal(byte[] input, int inputOffset, int inputLen,
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byte[] output, int outputOffset)
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throws ShortBufferException
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{
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return engineUpdate(input, inputOffset, inputLen, output, outputOffset);
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}
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}
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