2362N/A * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * This class represents ciphers in cipher block chaining (CBC) mode. 0N/A * <p>This mode is implemented independently of a particular cipher. 0N/A * Ciphers to which this mode should apply (e.g., DES) must be 0N/A * <i>plugged-in</i> using the constructor. 0N/A * <p>NOTE: This class does not deal with buffering or padding. 0N/A * @author Gigi Ankeny 0N/A * random bytes that are initialized with iv 0N/A * Gets the name of this feedback mode. 0N/A * @return the string <code>CBC</code> 0N/A * Initializes the cipher in the specified mode with the given key 0N/A * @param decrypting flag indicating encryption or decryption 0N/A * @param algorithm the algorithm name 0N/A * @param key the key 0N/A * @exception InvalidKeyException if the given key is inappropriate for 0N/A * initializing this cipher 0N/A * Resets the iv to its original value. 0N/A * This is used when doFinal is called in the Cipher class, so that the 0N/A * cipher can be reused (with its original iv). 0N/A * Save the current content of this cipher. 0N/A * Restores the content of this cipher to the previous saved one. 0N/A * Performs encryption operation. 0N/A * <p>The input plain text <code>plain</code>, starting at 0N/A * <code>plainOffset</code> and ending at 0N/A * <code>(plainOffset + len - 1)</code>, is encrypted. 0N/A * The result is stored in <code>cipher</code>, starting at 0N/A * <code>cipherOffset</code>. 0N/A * <p>It is the application's responsibility to make sure that 0N/A * <code>plainLen</code> is a multiple of the embedded cipher's block size, 0N/A * as any excess bytes are ignored. 0N/A * @param plain the buffer with the input data to be encrypted 0N/A * @param plainOffset the offset in <code>plain</code> 0N/A * @param plainLen the length of the input data 0N/A * @param cipher the buffer for the result 0N/A * @param cipherOffset the offset in <code>cipher</code> 0N/A * Performs decryption operation. 0N/A * <p>The input cipher text <code>cipher</code>, starting at 0N/A * <code>cipherOffset</code> and ending at 0N/A * <code>(cipherOffset + len - 1)</code>, is decrypted. 0N/A * The result is stored in <code>plain</code>, starting at 0N/A * <code>plainOffset</code>. 0N/A * <p>It is the application's responsibility to make sure that 0N/A * <code>cipherLen</code> is a multiple of the embedded cipher's block 0N/A * size, as any excess bytes are ignored. 0N/A * <p>It is also the application's responsibility to make sure that 0N/A * <code>init</code> has been called before this method is called. 0N/A * (This check is omitted here, to avoid double checking.) 0N/A * @param cipher the buffer with the input data to be decrypted 0N/A * @param cipherOffset the offset in <code>cipherOffset</code> 0N/A * @param cipherLen the length of the input data 0N/A * @param plain the buffer for the result 0N/A * @param plainOffset the offset in <code>plain</code> 0N/A * @exception IllegalBlockSizeException if input data whose length does 0N/A * not correspond to the embedded cipher's block size is passed to the 0N/A // Save the original ciphertext blocks, so they can be 0N/A // stored in the feedback register "r". 0N/A // This is necessary because in this constellation, a 0N/A // ciphertext block (or parts of it) will be overridden by 0N/A // the plaintext result.