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jeremybenn |
/* ARCFourSpi.java --
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Copyright (C) 2002, 2006 Free Software Foundation, Inc.
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This file is a 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 of the License, or (at
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your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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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 gnu.javax.crypto.jce.cipher;
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import gnu.java.security.Registry;
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import gnu.javax.crypto.prng.ARCFour;
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import gnu.java.security.prng.IRandom;
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import gnu.java.security.prng.LimitReachedException;
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import gnu.javax.crypto.prng.PRNGFactory;
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import java.security.AlgorithmParameters;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.security.spec.AlgorithmParameterSpec;
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import java.util.HashMap;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.CipherSpi;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.ShortBufferException;
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/**
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* The <i>Service Provider Interface</i> (<b>SPI</b>) for the ARCFOUR stream
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* cipher.
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*/
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public class ARCFourSpi
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extends CipherSpi
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{
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private IRandom keystream;
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public ARCFourSpi()
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{
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super();
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keystream = PRNGFactory.getInstance(Registry.ARCFOUR_PRNG);
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}
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protected int engineGetBlockSize()
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{
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return 0; // stream cipher.
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}
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protected void engineSetMode(String s) throws NoSuchAlgorithmException
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{
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// ignored.
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}
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protected void engineSetPadding(String s) throws NoSuchPaddingException
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{
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// ignored.
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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 int engineGetOutputSize(int in)
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{
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return in;
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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 r)
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throws InvalidKeyException
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{
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if (mode != Cipher.ENCRYPT_MODE && mode != Cipher.DECRYPT_MODE)
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throw new IllegalArgumentException(
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"arcfour is for encryption or decryption only");
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if (key == null || ! key.getFormat().equalsIgnoreCase("RAW"))
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throw new InvalidKeyException("key must be non-null raw bytes");
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HashMap attrib = new HashMap();
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attrib.put(ARCFour.ARCFOUR_KEY_MATERIAL, key.getEncoded());
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keystream.init(attrib);
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}
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protected void engineInit(int mode, Key key, AlgorithmParameterSpec p,
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SecureRandom r) throws InvalidKeyException,
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InvalidAlgorithmParameterException
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{
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engineInit(mode, key, r);
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}
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protected void engineInit(int mode, Key key, AlgorithmParameters p,
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SecureRandom r) throws InvalidKeyException,
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InvalidAlgorithmParameterException
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{
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engineInit(mode, key, r);
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}
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protected byte[] engineUpdate(byte[] in, int offset, int length)
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{
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if (length < 0 || offset < 0 || length + offset > in.length)
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throw new ArrayIndexOutOfBoundsException();
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byte[] result = new byte[length];
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try
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{
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for (int i = 0; i < length; i++)
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result[i] = (byte)(in[i + offset] ^ keystream.nextByte());
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}
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catch (LimitReachedException wontHappen)
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{
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}
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return result;
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}
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protected int engineUpdate(byte[] in, int inOffset, int length, byte[] out,
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int outOffset) throws ShortBufferException
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{
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if (length < 0 || inOffset < 0 || length + inOffset > in.length
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|| outOffset < 0)
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throw new ArrayIndexOutOfBoundsException();
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if (outOffset + length > out.length)
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throw new ShortBufferException();
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try
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{
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for (int i = 0; i < length; i++)
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out[i + outOffset] = (byte)(in[i + inOffset] ^ keystream.nextByte());
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}
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catch (LimitReachedException wontHappen)
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{
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}
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return length;
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}
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protected byte[] engineDoFinal(byte[] in, int offset, int length)
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throws IllegalBlockSizeException, BadPaddingException
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{
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return engineUpdate(in, offset, length);
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}
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protected int engineDoFinal(byte[] in, int inOffset, int length, byte[] out,
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int outOffset) throws ShortBufferException,
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IllegalBlockSizeException, BadPaddingException
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{
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return engineUpdate(in, inOffset, length, out, outOffset);
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}
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}
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