| /* |
| * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.security.InvalidKeyException; |
| |
| /** |
| * This abstract class represents the core of all block ciphers. It allows to |
| * intialize the cipher and encrypt/decrypt single blocks. Larger quantities |
| * are handled by modes, which are subclasses of FeedbackCipher. |
| * |
| * @author Gigi Ankeny |
| * @author Jan Luehe |
| * |
| * |
| * @see AESCrypt |
| * @see DESCrypt |
| * @see DESedeCrypt |
| * @see BlowfishCrypt |
| * @see FeedbackCipher |
| */ |
| abstract class SymmetricCipher { |
| |
| SymmetricCipher() { |
| // empty |
| } |
| |
| /** |
| * Retrieves this cipher's block size. |
| * |
| * @return the block size of this cipher |
| */ |
| abstract int getBlockSize(); |
| |
| /** |
| * Initializes the cipher in the specified mode with the given key. |
| * |
| * @param decrypting flag indicating encryption or decryption |
| * @param algorithm the algorithm name |
| * @param key the key |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this cipher |
| */ |
| abstract void init(boolean decrypting, String algorithm, byte[] key) |
| throws InvalidKeyException; |
| |
| /** |
| * Encrypt one cipher block. |
| * |
| * <p>The input <code>plain</code>, starting at <code>plainOffset</code> |
| * and ending at <code>(plainOffset+blockSize-1)</code>, is encrypted. |
| * The result is stored in <code>cipher</code>, starting at |
| * <code>cipherOffset</code>. |
| * |
| * @param plain the input buffer with the data to be encrypted |
| * @param plainOffset the offset in <code>plain</code> |
| * @param cipher the buffer for the encryption result |
| * @param cipherOffset the offset in <code>cipher</code> |
| */ |
| abstract void encryptBlock(byte[] plain, int plainOffset, |
| byte[] cipher, int cipherOffset); |
| |
| /** |
| * Decrypt one cipher block. |
| * |
| * <p>The input <code>cipher</code>, starting at <code>cipherOffset</code> |
| * and ending at <code>(cipherOffset+blockSize-1)</code>, is decrypted. |
| * The result is stored in <code>plain</code>, starting at |
| * <code>plainOffset</code>. |
| * |
| * @param cipher the input buffer with the data to be decrypted |
| * @param cipherOffset the offset in <code>cipher</code> |
| * @param plain the buffer for the decryption result |
| * @param plainOffset the offset in <code>plain</code> |
| */ |
| abstract void decryptBlock(byte[] cipher, int cipherOffset, |
| byte[] plain, int plainOffset); |
| } |