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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 class implements the Triple DES algorithm (DES encryption, followed by | |
| 32 | + * DES decryption, followed by DES encryption) on a byte array of size | |
| 33 | + * <code>DES_BLOCK_SIZE</code>. Each DES operation has its own key. | |
| 34 | + * | |
| 35 | + * @author Gigi Ankeny | |
| 36 | + * @author Jan Luehe | |
| 37 | + * | |
| 38 | + * | |
| 39 | + * @see DESConstants | |
| 40 | + * @see DESCipher | |
| 41 | + */ | |
| 42 | + | |
| 43 | +final class DESedeCrypt extends DESCrypt implements DESConstants { | |
| 44 | + | |
| 45 | + /* | |
| 46 | + * the expanded key used in encrypt/decrypt/encrypt phase | |
| 47 | + */ | |
| 48 | + private byte[] key1 = null; | |
| 49 | + private byte[] key2 = null; | |
| 50 | + private byte[] key3 = null; | |
| 51 | + private byte[] buf1, buf2; | |
| 52 | + | |
| 53 | + /* | |
| 54 | + * constructor | |
| 55 | + */ | |
| 56 | + DESedeCrypt() { | |
| 57 | + buf1 = new byte[DES_BLOCK_SIZE]; | |
| 58 | + buf2 = new byte[DES_BLOCK_SIZE]; | |
| 59 | + } | |
| 60 | + | |
| 61 | + void init(boolean decrypting, String algorithm, byte[] keys) | |
| 62 | + throws InvalidKeyException { | |
| 63 | + if (!algorithm.equalsIgnoreCase("DESede") | |
| 64 | + && !algorithm.equalsIgnoreCase("TripleDES")) { | |
| 65 | + throw new InvalidKeyException | |
| 66 | + ("Wrong algorithm: DESede or TripleDES required"); | |
| 67 | + } | |
| 68 | + if (keys.length != DES_BLOCK_SIZE * 3) { | |
| 69 | + throw new InvalidKeyException("Wrong key size"); | |
| 70 | + } | |
| 71 | + | |
| 72 | + byte[] keybuf = new byte[DES_BLOCK_SIZE]; | |
| 73 | + | |
| 74 | + // retrieve the first key | |
| 75 | + key1 = new byte[128]; | |
| 76 | + System.arraycopy(keys, 0, keybuf, 0, DES_BLOCK_SIZE); | |
| 77 | + expandKey(keybuf); | |
| 78 | + System.arraycopy(expandedKey, 0, key1, 0, 128); | |
| 79 | + | |
| 80 | + // check if the third key is the same | |
| 81 | + if (keyEquals(keybuf, 0, keys, DES_BLOCK_SIZE*2, DES_BLOCK_SIZE)) { | |
| 82 | + key3 = key1; | |
| 83 | + } else { | |
| 84 | + key3 = new byte[128]; | |
| 85 | + System.arraycopy(keys, DES_BLOCK_SIZE*2, keybuf, 0, | |
| 86 | + DES_BLOCK_SIZE); | |
| 87 | + expandKey(keybuf); | |
| 88 | + System.arraycopy(expandedKey, 0, key3, 0, 128); | |
| 89 | + } | |
| 90 | + | |
| 91 | + // retrieve the second key | |
| 92 | + key2 = new byte[128]; | |
| 93 | + System.arraycopy(keys, DES_BLOCK_SIZE, keybuf, 0, DES_BLOCK_SIZE); | |
| 94 | + expandKey(keybuf); | |
| 95 | + System.arraycopy(expandedKey, 0, key2, 0, 128); | |
| 96 | + | |
| 97 | + } | |
| 98 | + | |
| 99 | + /** | |
| 100 | + * Performs encryption operation. | |
| 101 | + * | |
| 102 | + * <p>The input plain text <code>plain</code>, starting at | |
| 103 | + * <code>plainOffset</code> and ending at | |
| 104 | + * <code>(plainOffset + blockSize - 1)</code>, is encrypted. | |
| 105 | + * The result is stored in <code>cipher</code>, starting at | |
| 106 | + * <code>cipherOffset</code>. | |
| 107 | + * | |
| 108 | + * @param plain the buffer with the input data to be encrypted | |
| 109 | + * @param plainOffset the offset in <code>plain</code> | |
| 110 | + * @param cipher the buffer for the result | |
| 111 | + * @param cipherOffset the offset in <code>cipher</code> | |
| 112 | + */ | |
| 113 | + void encryptBlock(byte[] plain, int plainOffset, | |
| 114 | + byte[] cipher, int cipherOffset) | |
| 115 | + { | |
| 116 | + expandedKey = key1; | |
| 117 | + decrypting = false; | |
| 118 | + cipherBlock(plain, plainOffset, buf1, 0); | |
| 119 | + | |
| 120 | + expandedKey = key2; | |
| 121 | + decrypting = true; | |
| 122 | + cipherBlock(buf1, 0, buf2, 0); | |
| 123 | + | |
| 124 | + expandedKey = key3; | |
| 125 | + decrypting = false; | |
| 126 | + cipherBlock(buf2, 0, cipher, cipherOffset); | |
| 127 | + } | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * Performs decryption operation. | |
| 131 | + * | |
| 132 | + * <p>The input cipher text <code>cipher</code>, starting at | |
| 133 | + * <code>cipherOffset</code> and ending at | |
| 134 | + * <code>(cipherOffset + blockSize - 1)</code>, is decrypted. | |
| 135 | + * The result is stored in <code>plain</code>, starting at | |
| 136 | + * <code>plainOffset</code>. | |
| 137 | + * | |
| 138 | + * @param cipher the buffer with the input data to be decrypted | |
| 139 | + * @param cipherOffset the offset in <code>cipherOffset</code> | |
| 140 | + * @param plain the buffer for the result | |
| 141 | + * @param plainOffset the offset in <code>plain</code> | |
| 142 | + */ | |
| 143 | + void decryptBlock(byte[] cipher, int cipherOffset, | |
| 144 | + byte[] plain, int plainOffset) | |
| 145 | + { | |
| 146 | + expandedKey = key3; | |
| 147 | + decrypting = true; | |
| 148 | + cipherBlock(cipher, cipherOffset, buf1, 0); | |
| 149 | + | |
| 150 | + expandedKey = key2; | |
| 151 | + decrypting = false; | |
| 152 | + cipherBlock(buf1, 0, buf2, 0); | |
| 153 | + | |
| 154 | + expandedKey = key1; | |
| 155 | + decrypting = true; | |
| 156 | + cipherBlock(buf2, 0, plain, plainOffset); | |
| 157 | + } | |
| 158 | + | |
| 159 | + private boolean keyEquals(byte[] key1, int off1, | |
| 160 | + byte[] key2, int off2, int len) { | |
| 161 | + | |
| 162 | + for (int i=0; i<len; i++) { | |
| 163 | + if (key1[i+off1] != key2[i+off2]) | |
| 164 | + return false; | |
| 165 | + } | |
| 166 | + return true; | |
| 167 | + } | |
| 168 | +} | |