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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 javax.crypto.spec; | ||
| 27 | |||
| 28 | import java.security.InvalidKeyException; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * This class specifies a DES key. | ||
| 32 | * | ||
| 33 | * @author Jan Luehe | ||
| 34 | * | ||
| 35 | * @since 1.4 | ||
| 36 | */ | ||
| 37 | public class DESKeySpec implements java.security.spec.KeySpec { | ||
| 38 | |||
| 39 | /** | ||
| 40 | * The constant which defines the length of a DES key in bytes. | ||
| 41 | */ | ||
| 42 | public static final int DES_KEY_LEN = 8; | ||
| 43 | |||
| 44 | private byte[] key; | ||
| 45 | |||
| 46 | /* | ||
| 47 | * Weak/semi-weak keys copied from FIPS 74. | ||
| 48 | * | ||
| 49 | * "...The first 6 keys have duals different than themselves, hence | ||
| 50 | * each is both a key and a dual giving 12 keys with duals. The last | ||
| 51 | * four keys equal their duals, and are called self-dual keys..." | ||
| 52 | * | ||
| 53 | * 1. E001E001F101F101 01E001E001F101F1 | ||
| 54 | * 2. FE1FFE1FFEOEFEOE 1FFE1FFEOEFEOEFE | ||
| 55 | * 3. E01FE01FF10EF10E 1FE01FEOOEF10EF1 | ||
| 56 | * 4. 01FE01FE01FE01FE FE01FE01FE01FE01 | ||
| 57 | * 5. 011F011F010E010E 1F011F010E010E01 | ||
| 58 | * 6. E0FEE0FEF1FEF1FE FEE0FEE0FEF1FEF1 | ||
| 59 | * 7. 0101010101010101 0101010101010101 | ||
| 60 | * 8. FEFEFEFEFEFEFEFE FEFEFEFEFEFEFEFE | ||
| 61 | * 9. E0E0E0E0F1F1F1F1 E0E0E0E0F1F1F1F1 | ||
| 62 | * 10. 1F1F1F1F0E0E0E0E 1F1F1F1F0E0E0E0E | ||
| 63 | */ | ||
| 64 | private static final byte[][] WEAK_KEYS = { | ||
| 65 | |||
| 66 | { (byte)0x01, (byte)0x01, (byte)0x01, (byte)0x01, (byte)0x01, | ||
| 67 | (byte)0x01, (byte)0x01, (byte)0x01 }, | ||
| 68 | |||
| 69 | { (byte)0xFE, (byte)0xFE, (byte)0xFE, (byte)0xFE, (byte)0xFE, | ||
| 70 | (byte)0xFE, (byte)0xFE, (byte)0xFE }, | ||
| 71 | |||
| 72 | { (byte)0x1F, (byte)0x1F, (byte)0x1F, (byte)0x1F, (byte)0x0E, | ||
| 73 | (byte)0x0E, (byte)0x0E, (byte)0x0E }, | ||
| 74 | |||
| 75 | { (byte)0xE0, (byte)0xE0, (byte)0xE0, (byte)0xE0, (byte)0xF1, | ||
| 76 | (byte)0xF1, (byte)0xF1, (byte)0xF1 }, | ||
| 77 | |||
| 78 | { (byte)0x01, (byte)0xFE, (byte)0x01, (byte)0xFE, (byte)0x01, | ||
| 79 | (byte)0xFE, (byte)0x01, (byte)0xFE }, | ||
| 80 | |||
| 81 | { (byte)0x1F, (byte)0xE0, (byte)0x1F, (byte)0xE0, (byte)0x0E, | ||
| 82 | (byte)0xF1, (byte)0x0E, (byte)0xF1 }, | ||
| 83 | |||
| 84 | { (byte)0x01, (byte)0xE0, (byte)0x01, (byte)0xE0, (byte)0x01, | ||
| 85 | (byte)0xF1, (byte)0x01, (byte)0xF1 }, | ||
| 86 | |||
| 87 | { (byte)0x1F, (byte)0xFE, (byte)0x1F, (byte)0xFE, (byte)0x0E, | ||
| 88 | (byte)0xFE, (byte)0x0E, (byte)0xFE }, | ||
| 89 | |||
| 90 | { (byte)0x01, (byte)0x1F, (byte)0x01, (byte)0x1F, (byte)0x01, | ||
| 91 | (byte)0x0E, (byte)0x01, (byte)0x0E }, | ||
| 92 | |||
| 93 | { (byte)0xE0, (byte)0xFE, (byte)0xE0, (byte)0xFE, (byte)0xF1, | ||
| 94 | (byte)0xFE, (byte)0xF1, (byte)0xFE }, | ||
| 95 | |||
| 96 | { (byte)0xFE, (byte)0x01, (byte)0xFE, (byte)0x01, (byte)0xFE, | ||
| 97 | (byte)0x01, (byte)0xFE, (byte)0x01 }, | ||
| 98 | |||
| 99 | { (byte)0xE0, (byte)0x1F, (byte)0xE0, (byte)0x1F, (byte)0xF1, | ||
| 100 | (byte)0x0E, (byte)0xF1, (byte)0x0E }, | ||
| 101 | |||
| 102 | { (byte)0xE0, (byte)0x01, (byte)0xE0, (byte)0x01, (byte)0xF1, | ||
| 103 | (byte)0x01, (byte)0xF1, (byte)0x01 }, | ||
| 104 | |||
| 105 | { (byte)0xFE, (byte)0x1F, (byte)0xFE, (byte)0x1F, (byte)0xFE, | ||
| 106 | (byte)0x0E, (byte)0xFE, (byte)0x0E }, | ||
| 107 | |||
| 108 | { (byte)0x1F, (byte)0x01, (byte)0x1F, (byte)0x01, (byte)0x0E, | ||
| 109 | (byte)0x01, (byte)0x0E, (byte)0x01 }, | ||
| 110 | |||
| 111 | { (byte)0xFE, (byte)0xE0, (byte)0xFE, (byte)0xE0, (byte)0xFE, | ||
| 112 | (byte)0xF1, (byte)0xFE, (byte)0xF1 } | ||
| 113 | }; | ||
| 114 | |||
| 115 | /** | ||
| 116 | * Creates a DESKeySpec object using the first 8 bytes in | ||
| 117 | * <code>key</code> as the key material for the DES key. | ||
| 118 | * | ||
| 119 | * <p> The bytes that constitute the DES key are those between | ||
| 120 | * <code>key[0]</code> and <code>key[7]</code> inclusive. | ||
| 121 | * | ||
| 122 | * @param key the buffer with the DES key material. The first 8 bytes | ||
| 123 | * of the buffer are copied to protect against subsequent modification. | ||
| 124 | * | ||
| 125 | * @exception NullPointerException if the given key material is | ||
| 126 | * <code>null</code> | ||
| 127 | * @exception InvalidKeyException if the given key material is shorter | ||
| 128 | * than 8 bytes. | ||
| 129 | */ | ||
| 130 | public DESKeySpec(byte[] key) throws InvalidKeyException { | ||
| 131 | this(key, 0); | ||
| 132 | } | ||
| 133 | |||
| 134 | /** | ||
| 135 | * Creates a DESKeySpec object using the first 8 bytes in | ||
| 136 | * <code>key</code>, beginning at <code>offset</code> inclusive, | ||
| 137 | * as the key material for the DES key. | ||
| 138 | * | ||
| 139 | * <p> The bytes that constitute the DES key are those between | ||
| 140 | * <code>key[offset]</code> and <code>key[offset+7]</code> inclusive. | ||
| 141 | * | ||
| 142 | * @param key the buffer with the DES key material. The first 8 bytes | ||
| 143 | * of the buffer beginning at <code>offset</code> inclusive are copied | ||
| 144 | * to protect against subsequent modification. | ||
| 145 | * @param offset the offset in <code>key</code>, where the DES key | ||
| 146 | * material starts. | ||
| 147 | * | ||
| 148 | * @exception NullPointerException if the given key material is | ||
| 149 | * <code>null</code> | ||
| 150 | * @exception InvalidKeyException if the given key material, starting at | ||
| 151 | * <code>offset</code> inclusive, is shorter than 8 bytes. | ||
| 152 | */ | ||
| 153 | public DESKeySpec(byte[] key, int offset) throws InvalidKeyException { | ||
| 154 | if (key.length - offset < DES_KEY_LEN) { | ||
| 155 | throw new InvalidKeyException("Wrong key size"); | ||
| 156 | } | ||
| 157 | this.key = new byte[DES_KEY_LEN]; | ||
| 158 | System.arraycopy(key, offset, this.key, 0, DES_KEY_LEN); | ||
| 159 | } | ||
| 160 | |||
| 161 | /** | ||
| 162 | * Returns the DES key material. | ||
| 163 | * | ||
| 164 | * @return the DES key material. Returns a new array | ||
| 165 | * each time this method is called. | ||
| 166 | */ | ||
| 167 | public byte[] getKey() { | ||
| 168 | return (byte[])this.key.clone(); | ||
| 169 | } | ||
| 170 | |||
| 171 | /** | ||
| 172 | * Checks if the given DES key material, starting at <code>offset</code> | ||
| 173 | * inclusive, is parity-adjusted. | ||
| 174 | * | ||
| 175 | * @param key the buffer with the DES key material. | ||
| 176 | * @param offset the offset in <code>key</code>, where the DES key | ||
| 177 | * material starts. | ||
| 178 | * | ||
| 179 | * @return true if the given DES key material is parity-adjusted, false | ||
| 180 | * otherwise. | ||
| 181 | * | ||
| 182 | * @exception InvalidKeyException if the given key material is | ||
| 183 | * <code>null</code>, or starting at <code>offset</code> inclusive, is | ||
| 184 | * shorter than 8 bytes. | ||
| 185 | */ | ||
| 186 | public static boolean isParityAdjusted(byte[] key, int offset) | ||
| 187 | throws InvalidKeyException { | ||
| 188 | if (key == null) { | ||
| 189 | throw new InvalidKeyException("null key"); | ||
| 190 | } | ||
| 191 | if (key.length - offset < DES_KEY_LEN) { | ||
| 192 | throw new InvalidKeyException("Wrong key size"); | ||
| 193 | } | ||
| 194 | |||
| 195 | for (int i = 0; i < DES_KEY_LEN; i++) { | ||
| 196 | int k = Integer.bitCount(key[offset++] & 0xff); | ||
| 197 | if ((k & 1) == 0) { | ||
| 198 | return false; | ||
| 199 | } | ||
| 200 | } | ||
| 201 | |||
| 202 | return true; | ||
| 203 | } | ||
| 204 | |||
| 205 | /** | ||
| 206 | * Checks if the given DES key material is weak or semi-weak. | ||
| 207 | * | ||
| 208 | * @param key the buffer with the DES key material. | ||
| 209 | * @param offset the offset in <code>key</code>, where the DES key | ||
| 210 | * material starts. | ||
| 211 | * | ||
| 212 | * @return true if the given DES key material is weak or semi-weak, false | ||
| 213 | * otherwise. | ||
| 214 | * | ||
| 215 | * @exception InvalidKeyException if the given key material is | ||
| 216 | * <code>null</code>, or starting at <code>offset</code> inclusive, is | ||
| 217 | * shorter than 8 bytes. | ||
| 218 | */ | ||
| 219 | public static boolean isWeak(byte[] key, int offset) | ||
| 220 | throws InvalidKeyException { | ||
| 221 | if (key == null) { | ||
| 222 | throw new InvalidKeyException("null key"); | ||
| 223 | } | ||
| 224 | if (key.length - offset < DES_KEY_LEN) { | ||
| 225 | throw new InvalidKeyException("Wrong key size"); | ||
| 226 | } | ||
| 227 | for (int i = 0; i < WEAK_KEYS.length; i++) { | ||
| 228 | boolean found = true; | ||
| 229 | for (int j = 0; j < DES_KEY_LEN && found == true; j++) { | ||
| 230 | if (WEAK_KEYS[i][j] != key[j+offset]) { | ||
| 231 | found = false; | ||
| 232 | } | ||
| 233 | } | ||
| 234 | if (found == true) { | ||
| 235 | return found; | ||
| 236 | } | ||
| 237 | } | ||
| 238 | return false; | ||
| 239 | } | ||
| 240 | } | ||