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jeremybenn |
/* CipherAdapter.java --
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Copyright (C) 2002, 2003, 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.cipher.CipherFactory;
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import gnu.javax.crypto.cipher.IBlockCipher;
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import gnu.javax.crypto.jce.spec.BlockCipherParameterSpec;
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import gnu.javax.crypto.mode.IMode;
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import gnu.javax.crypto.mode.ModeFactory;
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import gnu.javax.crypto.pad.IPad;
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import gnu.javax.crypto.pad.PadFactory;
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import gnu.javax.crypto.pad.WrongPaddingException;
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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.security.spec.InvalidParameterSpecException;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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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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import javax.crypto.spec.IvParameterSpec;
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/**
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* The implementation of a generic {@link Cipher} <i>Adapter</i> class to wrap
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* GNU cipher instances.
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* <p>
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* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for
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* the {@link Cipher} class, which provides the functionality of symmetric-key
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* block ciphers, such as the AES.
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* <p>
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* This base class defines all of the abstract methods in {@link CipherSpi},
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* but does not define the (non-abstract) key wrapping functions that extended
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* the base cipher SPI, and these methods thus immediately throw an
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* {@link UnsupportedOperationException}. If a cipher implementation provides
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* this functionality, or if it in fact accepts parameters other than the key
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* and the initialization vector, the subclass should override those methods.
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* Otherwise a subclass need only call the {@link #CipherAdapter(String)}
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* constructor with the name of the cipher.
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*/
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class CipherAdapter
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extends CipherSpi
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{
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/** Our cipher instance. */
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protected IBlockCipher cipher;
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/** Our mode instance. */
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protected IMode mode;
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/** Our padding instance. */
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protected IPad pad;
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/** The current key size. */
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protected int keyLen;
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/** Our attributes map. */
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protected Map attributes;
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/** An incomplete block. */
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protected byte[] partBlock;
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/** The number of bytes in {@link #partBlock}. */
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protected int partLen;
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/** The length of blocks we are processing. */
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protected int blockLen;
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/**
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* Protected constructor to be called by subclasses. The cipher name argument
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* should be the appropriate one listed in {@link Registry}. The basic cipher
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* instance is created, along with an instance of the
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* {@link gnu.javax.crypto.mode.ECB} mode and no padding.
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*
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* @param cipherName The cipher to instantiate.
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* @param blockLen The block length to use.
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*/
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protected CipherAdapter(String cipherName, int blockLen)
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{
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cipher = CipherFactory.getInstance(cipherName);
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attributes = new HashMap();
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this.blockLen = blockLen;
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mode = ModeFactory.getInstance("ECB", cipher, blockLen);
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attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE, Integer.valueOf(blockLen));
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}
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/**
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* Creates a new cipher adapter with the default block size.
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*
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* @param cipherName The cipher to instantiate.
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*/
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protected CipherAdapter(String cipherName)
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{
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cipher = CipherFactory.getInstance(cipherName);
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blockLen = cipher.defaultBlockSize();
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attributes = new HashMap();
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mode = ModeFactory.getInstance("ECB", cipher, blockLen);
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attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE, Integer.valueOf(blockLen));
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}
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protected void engineSetMode(String modeName) throws NoSuchAlgorithmException
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{
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if (modeName.length() >= 3
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&& modeName.substring(0, 3).equalsIgnoreCase("CFB"))
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{
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if (modeName.length() > 3)
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{
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try
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{
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int bs = Integer.parseInt(modeName.substring(3));
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attributes.put(IMode.MODE_BLOCK_SIZE, Integer.valueOf(bs / 8));
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}
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catch (NumberFormatException nfe)
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{
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throw new NoSuchAlgorithmException(modeName);
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}
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modeName = "CFB";
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}
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}
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else
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attributes.remove(IMode.MODE_BLOCK_SIZE);
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mode = ModeFactory.getInstance(modeName, cipher, blockLen);
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if (mode == null)
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throw new NoSuchAlgorithmException(modeName);
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}
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protected void engineSetPadding(String padName) throws NoSuchPaddingException
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{
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if (padName.equalsIgnoreCase("NoPadding"))
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{
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pad = null;
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return;
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}
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pad = PadFactory.getInstance(padName);
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if (pad == null)
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throw new NoSuchPaddingException(padName);
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}
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protected int engineGetBlockSize()
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{
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if (cipher != null)
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return blockLen;
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return 0;
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}
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protected int engineGetOutputSize(int inputLen)
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{
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final int blockSize = mode.currentBlockSize();
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return ((inputLen + partLen) / blockSize) * blockSize;
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}
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protected byte[] engineGetIV()
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{
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byte[] iv = (byte[]) attributes.get(IMode.IV);
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if (iv == null)
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return null;
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return (byte[]) iv.clone();
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}
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protected AlgorithmParameters engineGetParameters()
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{
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byte[] iv = (byte[]) attributes.get(IMode.IV);
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int cipherBlockSize = cipher.currentBlockSize();
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BlockCipherParameterSpec spec = new BlockCipherParameterSpec(iv,
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cipherBlockSize,
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keyLen);
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AlgorithmParameters params;
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try
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{
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params = AlgorithmParameters.getInstance("BlockCipherParameters");
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params.init(spec);
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}
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catch (NoSuchAlgorithmException nsae)
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{
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return null;
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}
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catch (InvalidParameterSpecException ipse)
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{
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return null;
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}
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return params;
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}
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protected void engineInit(int opmode, Key key, SecureRandom random)
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throws InvalidKeyException
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{
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try
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{
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engineInit(opmode, key, (AlgorithmParameterSpec) null, random);
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}
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catch (InvalidAlgorithmParameterException e)
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{
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throw new InvalidKeyException(e.getMessage(), e);
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}
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}
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/**
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* Executes initialization logic after all parameters have been handled by the
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* engineInit()s.
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*
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* @param opmode the desired mode of operation for this instance.
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* @param key the key material to use for initialization.
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* @param random a source of randmoness to use if/when needed.
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* @throws InvalidKeyException if <code>key</code> is invalid or the cipher
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* needs extra parameters which can not be derived from
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* <code>key</code>; e.g. an IV.
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*/
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private void engineInitHandler(int opmode, Key key, SecureRandom random)
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throws InvalidKeyException
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{
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switch (opmode)
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{
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case Cipher.ENCRYPT_MODE:
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attributes.put(IMode.STATE, Integer.valueOf(IMode.ENCRYPTION));
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break;
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case Cipher.DECRYPT_MODE:
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attributes.put(IMode.STATE, Integer.valueOf(IMode.DECRYPTION));
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break;
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}
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if (! key.getFormat().equalsIgnoreCase("RAW"))
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throw new InvalidKeyException("bad key format " + key.getFormat());
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byte[] kb = key.getEncoded();
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int kbLength = kb.length;
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if (keyLen == 0)
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{
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// no key-size given; instead key-material is provided in kb --which
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// can be more than what we need. if we don't cull this down to what
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// the cipher likes/wants we may get an InvalidKeyException.
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//
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// try to find the largest key-size value that is less than or equal
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// to kbLength
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for (Iterator it = cipher.keySizes(); it.hasNext();)
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{
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int aKeySize = ((Integer) it.next()).intValue();
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if (aKeySize == kbLength)
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{
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keyLen = aKeySize;
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break;
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}
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else if (aKeySize < kbLength)
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keyLen = aKeySize;
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else // all remaining key-sizes are longer than kb.length
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break;
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}
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}
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if (keyLen == 0)
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{
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// we were unable to find a key-size, among those advertised by the
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// cipher, that is less than or equal to the length of the kb array.
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// set keyLen to kbLength. either the cipher implementation will throw
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// an InvalidKeyException, or it is implemented in a way which can deal
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// with an unsupported key-size.
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keyLen = kbLength;
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}
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if (keyLen < kbLength)
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{
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byte[] kbb = kb;
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kb = new byte[keyLen];
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System.arraycopy(kbb, 0, kb, 0, keyLen);
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}
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attributes.put(IBlockCipher.KEY_MATERIAL, kb);
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reset();
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}
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protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params,
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SecureRandom random) throws InvalidKeyException,
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InvalidAlgorithmParameterException
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{
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if (params == null)
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{
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// All cipher modes require parameters (like an IV) except ECB. When
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// these cant be derived from the given key then it must be generated
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// randomly if in ENCRYPT or WRAP mode. Parameters that have defaults
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// for our cipher must be set to these defaults.
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if (! mode.name().toLowerCase().startsWith(Registry.ECB_MODE + "("))
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{
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switch (opmode)
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{
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case Cipher.ENCRYPT_MODE:
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case Cipher.WRAP_MODE:
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byte[] iv = new byte[blockLen];
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random.nextBytes(iv);
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attributes.put(IMode.IV, iv);
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break;
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default:
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throw new InvalidAlgorithmParameterException(
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"Required algorithm parameters are missing for mode: "
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+ mode.name());
|
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}
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}
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// Add default for block length etc.
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blockLen = cipher.defaultBlockSize();
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attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE,
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Integer.valueOf(blockLen));
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keyLen = 0;
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}
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else if (params instanceof BlockCipherParameterSpec)
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{
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BlockCipherParameterSpec bcps = (BlockCipherParameterSpec) params;
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blockLen = bcps.getBlockSize();
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attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE, Integer.valueOf(blockLen));
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attributes.put(IMode.IV, bcps.getIV());
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keyLen = bcps.getKeySize();
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}
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else if (params instanceof IvParameterSpec)
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{
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// The size of the IV must match the block size
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347 |
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if (((IvParameterSpec) params).getIV().length != cipher.defaultBlockSize())
|
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{
|
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throw new InvalidAlgorithmParameterException();
|
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}
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351 |
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attributes.put(IMode.IV, ((IvParameterSpec) params).getIV());
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blockLen = cipher.defaultBlockSize();
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attributes.put(IBlockCipher.CIPHER_BLOCK_SIZE, Integer.valueOf(blockLen));
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keyLen = 0;
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}
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engineInitHandler(opmode, key, random);
|
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}
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359 |
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360 |
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protected void engineInit(int opmode, Key key, AlgorithmParameters params,
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361 |
|
|
SecureRandom random) throws InvalidKeyException,
|
362 |
|
|
InvalidAlgorithmParameterException
|
363 |
|
|
{
|
364 |
|
|
AlgorithmParameterSpec spec = null;
|
365 |
|
|
try
|
366 |
|
|
{
|
367 |
|
|
if (params != null)
|
368 |
|
|
spec = params.getParameterSpec(BlockCipherParameterSpec.class);
|
369 |
|
|
}
|
370 |
|
|
catch (InvalidParameterSpecException ignored)
|
371 |
|
|
{
|
372 |
|
|
}
|
373 |
|
|
engineInit(opmode, key, spec, random);
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
protected byte[] engineUpdate(byte[] input, int inOff, int inLen)
|
377 |
|
|
{
|
378 |
|
|
if (inLen == 0) // nothing to process
|
379 |
|
|
return new byte[0];
|
380 |
|
|
final int blockSize = mode.currentBlockSize();
|
381 |
|
|
int blockCount = (partLen + inLen) / blockSize;
|
382 |
|
|
|
383 |
|
|
// always keep data for unpadding in padded decryption mode;
|
384 |
|
|
// might even be a complete block
|
385 |
|
|
if (pad != null
|
386 |
|
|
&& ((Integer) attributes.get(IMode.STATE)).intValue() == IMode.DECRYPTION
|
387 |
|
|
&& (partLen + inLen) % blockSize == 0)
|
388 |
|
|
blockCount--;
|
389 |
|
|
|
390 |
|
|
final byte[] out = new byte[blockCount * blockSize];
|
391 |
|
|
try
|
392 |
|
|
{
|
393 |
|
|
engineUpdate(input, inOff, inLen, out, 0);
|
394 |
|
|
}
|
395 |
|
|
catch (ShortBufferException x) // should not happen
|
396 |
|
|
{
|
397 |
|
|
x.printStackTrace(System.err);
|
398 |
|
|
}
|
399 |
|
|
return out;
|
400 |
|
|
}
|
401 |
|
|
|
402 |
|
|
protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out,
|
403 |
|
|
int outOff) throws ShortBufferException
|
404 |
|
|
{
|
405 |
|
|
if (inLen == 0) // nothing to process
|
406 |
|
|
return 0;
|
407 |
|
|
final int blockSize = mode.currentBlockSize();
|
408 |
|
|
int blockCount = (partLen + inLen) / blockSize;
|
409 |
|
|
|
410 |
|
|
// always keep data for unpadding in padded decryption mode;
|
411 |
|
|
// might even be a complete block
|
412 |
|
|
if (pad != null
|
413 |
|
|
&& ((Integer) attributes.get(IMode.STATE)).intValue() == IMode.DECRYPTION
|
414 |
|
|
&& (partLen + inLen) % blockSize == 0)
|
415 |
|
|
blockCount--;
|
416 |
|
|
|
417 |
|
|
final int result = blockCount * blockSize;
|
418 |
|
|
if (result > out.length - outOff)
|
419 |
|
|
throw new ShortBufferException();
|
420 |
|
|
if (blockCount == 0) // not enough bytes for even 1 block
|
421 |
|
|
{
|
422 |
|
|
System.arraycopy(in, inOff, partBlock, partLen, inLen);
|
423 |
|
|
partLen += inLen;
|
424 |
|
|
return 0;
|
425 |
|
|
}
|
426 |
|
|
final byte[] buf;
|
427 |
|
|
// we have enough bytes for at least 1 block
|
428 |
|
|
if (partLen == 0) // if no cached bytes use input
|
429 |
|
|
buf = in;
|
430 |
|
|
else // prefix input with cached bytes
|
431 |
|
|
{
|
432 |
|
|
buf = new byte[partLen + inLen];
|
433 |
|
|
System.arraycopy(partBlock, 0, buf, 0, partLen);
|
434 |
|
|
if (in != null && inLen > 0)
|
435 |
|
|
System.arraycopy(in, inOff, buf, partLen, inLen);
|
436 |
|
|
inOff = 0;
|
437 |
|
|
}
|
438 |
|
|
for (int i = 0; i < blockCount; i++) // update blockCount * blockSize
|
439 |
|
|
{
|
440 |
|
|
mode.update(buf, inOff, out, outOff);
|
441 |
|
|
inOff += blockSize;
|
442 |
|
|
outOff += blockSize;
|
443 |
|
|
}
|
444 |
|
|
partLen += inLen - result;
|
445 |
|
|
if (partLen > 0) // cache remaining bytes from buf
|
446 |
|
|
System.arraycopy(buf, inOff, partBlock, 0, partLen);
|
447 |
|
|
return result;
|
448 |
|
|
}
|
449 |
|
|
|
450 |
|
|
protected byte[] engineDoFinal(byte[] input, int off, int len)
|
451 |
|
|
throws IllegalBlockSizeException, BadPaddingException
|
452 |
|
|
{
|
453 |
|
|
final byte[] result;
|
454 |
|
|
final byte[] buf = engineUpdate(input, off, len);
|
455 |
|
|
if (pad != null)
|
456 |
|
|
{
|
457 |
|
|
switch (((Integer) attributes.get(IMode.STATE)).intValue())
|
458 |
|
|
{
|
459 |
|
|
case IMode.ENCRYPTION:
|
460 |
|
|
byte[] padding = pad.pad(partBlock, 0, partLen);
|
461 |
|
|
byte[] buf2 = engineUpdate(padding, 0, padding.length);
|
462 |
|
|
result = new byte[buf.length + buf2.length];
|
463 |
|
|
System.arraycopy(buf, 0, result, 0, buf.length);
|
464 |
|
|
System.arraycopy(buf2, 0, result, buf.length, buf2.length);
|
465 |
|
|
break;
|
466 |
|
|
case IMode.DECRYPTION:
|
467 |
|
|
int padLen;
|
468 |
|
|
byte[] buf3 = new byte[buf.length + partLen];
|
469 |
|
|
try
|
470 |
|
|
{
|
471 |
|
|
if (partLen != mode.currentBlockSize())
|
472 |
|
|
throw new WrongPaddingException();
|
473 |
|
|
System.arraycopy(buf, 0, buf3, 0, buf.length);
|
474 |
|
|
mode.update(partBlock, 0, buf3, buf.length);
|
475 |
|
|
padLen = pad.unpad(buf3, 0, buf3.length);
|
476 |
|
|
}
|
477 |
|
|
catch (WrongPaddingException wpe)
|
478 |
|
|
{
|
479 |
|
|
throw new BadPaddingException(wpe.getMessage());
|
480 |
|
|
}
|
481 |
|
|
result = new byte[buf3.length - padLen];
|
482 |
|
|
System.arraycopy(buf3, 0, result, 0, result.length);
|
483 |
|
|
break;
|
484 |
|
|
default:
|
485 |
|
|
throw new IllegalStateException();
|
486 |
|
|
}
|
487 |
|
|
}
|
488 |
|
|
else
|
489 |
|
|
{
|
490 |
|
|
if (partLen > 0)
|
491 |
|
|
throw new IllegalBlockSizeException(partLen + " trailing bytes");
|
492 |
|
|
result = buf;
|
493 |
|
|
}
|
494 |
|
|
|
495 |
|
|
try
|
496 |
|
|
{
|
497 |
|
|
reset();
|
498 |
|
|
}
|
499 |
|
|
catch (InvalidKeyException ike)
|
500 |
|
|
{
|
501 |
|
|
// Should not happen; if we initialized it with the current
|
502 |
|
|
// parameters before, we should be able to do it again.
|
503 |
|
|
throw new Error(ike);
|
504 |
|
|
}
|
505 |
|
|
return result;
|
506 |
|
|
}
|
507 |
|
|
|
508 |
|
|
protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out,
|
509 |
|
|
int outOff) throws BadPaddingException,
|
510 |
|
|
IllegalBlockSizeException, ShortBufferException
|
511 |
|
|
{
|
512 |
|
|
byte[] buf = engineDoFinal(in, inOff, inLen);
|
513 |
|
|
if (out.length + outOff < buf.length)
|
514 |
|
|
throw new ShortBufferException();
|
515 |
|
|
System.arraycopy(buf, 0, out, outOff, buf.length);
|
516 |
|
|
return buf.length;
|
517 |
|
|
}
|
518 |
|
|
|
519 |
|
|
private void reset() throws InvalidKeyException
|
520 |
|
|
{
|
521 |
|
|
mode.reset();
|
522 |
|
|
mode.init(attributes);
|
523 |
|
|
if (pad != null)
|
524 |
|
|
{
|
525 |
|
|
pad.reset();
|
526 |
|
|
pad.init(blockLen);
|
527 |
|
|
}
|
528 |
|
|
partBlock = new byte[blockLen];
|
529 |
|
|
partLen = 0;
|
530 |
|
|
}
|
531 |
|
|
}
|