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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 | } | ||