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Diffstat (limited to 'gnu/javax/crypto/jce/cipher/ARCFourSpi.java')
| -rw-r--r-- | gnu/javax/crypto/jce/cipher/ARCFourSpi.java | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/gnu/javax/crypto/jce/cipher/ARCFourSpi.java b/gnu/javax/crypto/jce/cipher/ARCFourSpi.java new file mode 100644 index 000000000..8fc1fe4cb --- /dev/null +++ b/gnu/javax/crypto/jce/cipher/ARCFourSpi.java @@ -0,0 +1,208 @@ +/* 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. + * + * @version $Revision: 1.1 $ + */ +public class ARCFourSpi extends CipherSpi +{ + + // Constants and variables. + // ----------------------------------------------------------------------- + + private IRandom keystream; + + // Constructors. + // ----------------------------------------------------------------------- + + public ARCFourSpi() + { + super(); + keystream = PRNGFactory.getInstance(Registry.ARCFOUR_PRNG); + } + + // Methods implementing CipherSpi. + // ----------------------------------------------------------------------- + + 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); + } +}
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