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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package com.sun.crypto.provider; | |
| 27 | + | |
| 28 | +import java.security.InvalidKeyException; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * This abstract class represents the core of all block ciphers. It allows to | |
| 32 | + * intialize the cipher and encrypt/decrypt single blocks. Larger quantities | |
| 33 | + * are handled by modes, which are subclasses of FeedbackCipher. | |
| 34 | + * | |
| 35 | + * @author Gigi Ankeny | |
| 36 | + * @author Jan Luehe | |
| 37 | + * | |
| 38 | + * | |
| 39 | + * @see AESCrypt | |
| 40 | + * @see DESCrypt | |
| 41 | + * @see DESedeCrypt | |
| 42 | + * @see BlowfishCrypt | |
| 43 | + * @see FeedbackCipher | |
| 44 | + */ | |
| 45 | +abstract class SymmetricCipher { | |
| 46 | + | |
| 47 | + SymmetricCipher() { | |
| 48 | + // empty | |
| 49 | + } | |
| 50 | + | |
| 51 | + /** | |
| 52 | + * Retrieves this cipher's block size. | |
| 53 | + * | |
| 54 | + * @return the block size of this cipher | |
| 55 | + */ | |
| 56 | + abstract int getBlockSize(); | |
| 57 | + | |
| 58 | + /** | |
| 59 | + * Initializes the cipher in the specified mode with the given key. | |
| 60 | + * | |
| 61 | + * @param decrypting flag indicating encryption or decryption | |
| 62 | + * @param algorithm the algorithm name | |
| 63 | + * @param key the key | |
| 64 | + * | |
| 65 | + * @exception InvalidKeyException if the given key is inappropriate for | |
| 66 | + * initializing this cipher | |
| 67 | + */ | |
| 68 | + abstract void init(boolean decrypting, String algorithm, byte[] key) | |
| 69 | + throws InvalidKeyException; | |
| 70 | + | |
| 71 | + /** | |
| 72 | + * Encrypt one cipher block. | |
| 73 | + * | |
| 74 | + * <p>The input <code>plain</code>, starting at <code>plainOffset</code> | |
| 75 | + * and ending at <code>(plainOffset+blockSize-1)</code>, is encrypted. | |
| 76 | + * The result is stored in <code>cipher</code>, starting at | |
| 77 | + * <code>cipherOffset</code>. | |
| 78 | + * | |
| 79 | + * @param plain the input buffer with the data to be encrypted | |
| 80 | + * @param plainOffset the offset in <code>plain</code> | |
| 81 | + * @param cipher the buffer for the encryption result | |
| 82 | + * @param cipherOffset the offset in <code>cipher</code> | |
| 83 | + */ | |
| 84 | + abstract void encryptBlock(byte[] plain, int plainOffset, | |
| 85 | + byte[] cipher, int cipherOffset); | |
| 86 | + | |
| 87 | + /** | |
| 88 | + * Decrypt one cipher block. | |
| 89 | + * | |
| 90 | + * <p>The input <code>cipher</code>, starting at <code>cipherOffset</code> | |
| 91 | + * and ending at <code>(cipherOffset+blockSize-1)</code>, is decrypted. | |
| 92 | + * The result is stored in <code>plain</code>, starting at | |
| 93 | + * <code>plainOffset</code>. | |
| 94 | + * | |
| 95 | + * @param cipher the input buffer with the data to be decrypted | |
| 96 | + * @param cipherOffset the offset in <code>cipher</code> | |
| 97 | + * @param plain the buffer for the decryption result | |
| 98 | + * @param plainOffset the offset in <code>plain</code> | |
| 99 | + */ | |
| 100 | + abstract void decryptBlock(byte[] cipher, int cipherOffset, | |
| 101 | + byte[] plain, int plainOffset); | |
| 102 | +} | |