| /* ARCFourSpi.java -- |
| Copyright (C) 2002, 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.jce.cipher; |
| |
| import gnu.java.security.Registry; |
| import gnu.javax.crypto.prng.ARCFour; |
| import gnu.java.security.prng.IRandom; |
| import gnu.java.security.prng.LimitReachedException; |
| import gnu.javax.crypto.prng.PRNGFactory; |
| |
| import java.security.AlgorithmParameters; |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.InvalidKeyException; |
| import java.security.Key; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.SecureRandom; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| import java.util.HashMap; |
| |
| import javax.crypto.BadPaddingException; |
| import javax.crypto.Cipher; |
| import javax.crypto.CipherSpi; |
| import javax.crypto.IllegalBlockSizeException; |
| import javax.crypto.NoSuchPaddingException; |
| import javax.crypto.ShortBufferException; |
| |
| /** |
| * The <i>Service Provider Interface</i> (<b>SPI</b>) for the ARCFOUR stream |
| * cipher. |
| */ |
| public class ARCFourSpi |
| extends CipherSpi |
| { |
| private IRandom keystream; |
| |
| public ARCFourSpi() |
| { |
| super(); |
| keystream = PRNGFactory.getInstance(Registry.ARCFOUR_PRNG); |
| } |
| |
| protected int engineGetBlockSize() |
| { |
| return 0; // stream cipher. |
| } |
| |
| protected void engineSetMode(String s) throws NoSuchAlgorithmException |
| { |
| // ignored. |
| } |
| |
| protected void engineSetPadding(String s) throws NoSuchPaddingException |
| { |
| // ignored. |
| } |
| |
| protected byte[] engineGetIV() |
| { |
| return null; |
| } |
| |
| protected int engineGetOutputSize(int in) |
| { |
| return in; |
| } |
| |
| protected AlgorithmParameters engineGetParameters() |
| { |
| return null; |
| } |
| |
| protected void engineInit(int mode, Key key, SecureRandom r) |
| throws InvalidKeyException |
| { |
| if (mode != Cipher.ENCRYPT_MODE && mode != Cipher.DECRYPT_MODE) |
| throw new IllegalArgumentException( |
| "arcfour is for encryption or decryption only"); |
| if (key == null || ! key.getFormat().equalsIgnoreCase("RAW")) |
| throw new InvalidKeyException("key must be non-null raw bytes"); |
| HashMap attrib = new HashMap(); |
| attrib.put(ARCFour.ARCFOUR_KEY_MATERIAL, key.getEncoded()); |
| keystream.init(attrib); |
| } |
| |
| protected void engineInit(int mode, Key key, AlgorithmParameterSpec p, |
| SecureRandom r) throws InvalidKeyException, |
| InvalidAlgorithmParameterException |
| { |
| engineInit(mode, key, r); |
| } |
| |
| protected void engineInit(int mode, Key key, AlgorithmParameters p, |
| SecureRandom r) throws InvalidKeyException, |
| InvalidAlgorithmParameterException |
| { |
| engineInit(mode, key, r); |
| } |
| |
| protected byte[] engineUpdate(byte[] in, int offset, int length) |
| { |
| if (length < 0 || offset < 0 || length + offset > in.length) |
| throw new ArrayIndexOutOfBoundsException(); |
| byte[] result = new byte[length]; |
| try |
| { |
| for (int i = 0; i < length; i++) |
| result[i] = (byte)(in[i + offset] ^ keystream.nextByte()); |
| } |
| catch (LimitReachedException wontHappen) |
| { |
| } |
| return result; |
| } |
| |
| protected int engineUpdate(byte[] in, int inOffset, int length, byte[] out, |
| int outOffset) throws ShortBufferException |
| { |
| if (length < 0 || inOffset < 0 || length + inOffset > in.length |
| || outOffset < 0) |
| throw new ArrayIndexOutOfBoundsException(); |
| if (outOffset + length > out.length) |
| throw new ShortBufferException(); |
| try |
| { |
| for (int i = 0; i < length; i++) |
| out[i + outOffset] = (byte)(in[i + inOffset] ^ keystream.nextByte()); |
| } |
| catch (LimitReachedException wontHappen) |
| { |
| } |
| return length; |
| } |
| |
| protected byte[] engineDoFinal(byte[] in, int offset, int length) |
| throws IllegalBlockSizeException, BadPaddingException |
| { |
| return engineUpdate(in, offset, length); |
| } |
| |
| protected int engineDoFinal(byte[] in, int inOffset, int length, byte[] out, |
| int outOffset) throws ShortBufferException, |
| IllegalBlockSizeException, BadPaddingException |
| { |
| return engineUpdate(in, inOffset, length, out, outOffset); |
| } |
| } |