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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 | } | ||