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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2009, 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.SecureRandom; | |
| 29 | +import java.security.InvalidParameterException; | |
| 30 | +import java.security.InvalidAlgorithmParameterException; | |
| 31 | +import java.security.InvalidKeyException; | |
| 32 | +import java.security.spec.AlgorithmParameterSpec; | |
| 33 | +import javax.crypto.KeyGeneratorSpi; | |
| 34 | +import javax.crypto.SecretKey; | |
| 35 | +import javax.crypto.spec.DESKeySpec; | |
| 36 | + | |
| 37 | +/** | |
| 38 | + * This class generates a DES key. | |
| 39 | + * | |
| 40 | + * @author Jan Luehe | |
| 41 | + * | |
| 42 | + */ | |
| 43 | + | |
| 44 | +public final class DESKeyGenerator extends KeyGeneratorSpi { | |
| 45 | + | |
| 46 | + private SecureRandom random = null; | |
| 47 | + | |
| 48 | + /** | |
| 49 | + * Empty constructor | |
| 50 | + */ | |
| 51 | + public DESKeyGenerator() { | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * Initializes this key generator. | |
| 56 | + * | |
| 57 | + * @param random the source of randomness for this generator | |
| 58 | + */ | |
| 59 | + protected void engineInit(SecureRandom random) { | |
| 60 | + this.random = random; | |
| 61 | + } | |
| 62 | + | |
| 63 | + /** | |
| 64 | + * Initializes this key generator with the specified parameter | |
| 65 | + * set and a user-provided source of randomness. | |
| 66 | + * | |
| 67 | + * @param params the key generation parameters | |
| 68 | + * @param random the source of randomness for this key generator | |
| 69 | + * | |
| 70 | + * @exception InvalidAlgorithmParameterException if <code>params</code> is | |
| 71 | + * inappropriate for this key generator | |
| 72 | + */ | |
| 73 | + protected void engineInit(AlgorithmParameterSpec params, | |
| 74 | + SecureRandom random) | |
| 75 | + throws InvalidAlgorithmParameterException { | |
| 76 | + throw new InvalidAlgorithmParameterException | |
| 77 | + ("DES key generation does not take any parameters"); | |
| 78 | + } | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * Initializes this key generator for a certain keysize, using the given | |
| 82 | + * source of randomness. | |
| 83 | + * | |
| 84 | + * @param keysize the keysize. This is an algorithm-specific | |
| 85 | + * metric specified in number of bits. | |
| 86 | + * @param random the source of randomness for this key generator | |
| 87 | + */ | |
| 88 | + protected void engineInit(int keysize, SecureRandom random) { | |
| 89 | + if (keysize != 56) { | |
| 90 | + throw new InvalidParameterException("Wrong keysize: must " | |
| 91 | + + "be equal to 56"); | |
| 92 | + } | |
| 93 | + this.engineInit(random); | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Generates the DES key. | |
| 98 | + * | |
| 99 | + * @return the new DES key | |
| 100 | + */ | |
| 101 | + protected SecretKey engineGenerateKey() { | |
| 102 | + DESKey desKey = null; | |
| 103 | + | |
| 104 | + if (this.random == null) { | |
| 105 | + this.random = SunJCE.RANDOM; | |
| 106 | + } | |
| 107 | + | |
| 108 | + try { | |
| 109 | + byte[] key = new byte[DESKeySpec.DES_KEY_LEN]; | |
| 110 | + do { | |
| 111 | + this.random.nextBytes(key); | |
| 112 | + setParityBit(key, 0); | |
| 113 | + } while (DESKeySpec.isWeak(key, 0)); | |
| 114 | + desKey = new DESKey(key); | |
| 115 | + } catch (InvalidKeyException e) { | |
| 116 | + // this is never thrown | |
| 117 | + } | |
| 118 | + | |
| 119 | + return desKey; | |
| 120 | + } | |
| 121 | + | |
| 122 | + /* | |
| 123 | + * Does parity adjustment, using bit in position 8 as the parity bit, | |
| 124 | + * for 8 key bytes, starting at <code>offset</code>. | |
| 125 | + * | |
| 126 | + * The 8 parity bits of a DES key are only used for sanity-checking | |
| 127 | + * of the key, to see if the key could actually be a key. If you check | |
| 128 | + * the parity of the quantity, and it winds up not having the correct | |
| 129 | + * parity, then you'll know something went wrong. | |
| 130 | + * | |
| 131 | + * A key that is not parity adjusted (e.g. e4e4e4e4e4e4e4e4) produces the | |
| 132 | + * same output as a key that is parity adjusted (e.g. e5e5e5e5e5e5e5e5), | |
| 133 | + * because it is the 56 bits of the DES key that are cryptographically | |
| 134 | + * significant/"effective" -- the other 8 bits are just used for parity | |
| 135 | + * checking. | |
| 136 | + */ | |
| 137 | + static void setParityBit(byte[] key, int offset) { | |
| 138 | + if (key == null) | |
| 139 | + return; | |
| 140 | + | |
| 141 | + for (int i = 0; i < DESKeySpec.DES_KEY_LEN; i++) { | |
| 142 | + int b = key[offset] & 0xfe; | |
| 143 | + b |= (Integer.bitCount(b) & 1) ^ 1; | |
| 144 | + key[offset++] = (byte)b; | |
| 145 | + } | |
| 146 | + } | |
| 147 | +} | |