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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 javax.crypto.SecretKey; | |
| 29 | +import javax.crypto.SecretKeyFactorySpi; | |
| 30 | +import javax.crypto.spec.DESKeySpec; | |
| 31 | +import java.security.InvalidKeyException; | |
| 32 | +import java.security.spec.KeySpec; | |
| 33 | +import java.security.spec.InvalidKeySpecException; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * This class implements the DES key factory of the Sun provider. | |
| 37 | + * | |
| 38 | + * @author Jan Luehe | |
| 39 | + * | |
| 40 | + */ | |
| 41 | + | |
| 42 | +public final class DESKeyFactory extends SecretKeyFactorySpi { | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * Empty constructor | |
| 46 | + */ | |
| 47 | + public DESKeyFactory() { | |
| 48 | + } | |
| 49 | + | |
| 50 | + /** | |
| 51 | + * Generates a <code>SecretKey</code> object from the provided key | |
| 52 | + * specification (key material). | |
| 53 | + * | |
| 54 | + * @param keySpec the specification (key material) of the secret key | |
| 55 | + * | |
| 56 | + * @return the secret key | |
| 57 | + * | |
| 58 | + * @exception InvalidKeySpecException if the given key specification | |
| 59 | + * is inappropriate for this key factory to produce a public key. | |
| 60 | + */ | |
| 61 | + protected SecretKey engineGenerateSecret(KeySpec keySpec) | |
| 62 | + throws InvalidKeySpecException { | |
| 63 | + DESKey desKey = null; | |
| 64 | + | |
| 65 | + try { | |
| 66 | + if (!(keySpec instanceof DESKeySpec)) { | |
| 67 | + throw new InvalidKeySpecException | |
| 68 | + ("Inappropriate key specification"); | |
| 69 | + } | |
| 70 | + else { | |
| 71 | + DESKeySpec desKeySpec = (DESKeySpec)keySpec; | |
| 72 | + desKey = new DESKey(desKeySpec.getKey()); | |
| 73 | + } | |
| 74 | + } catch (InvalidKeyException e) { | |
| 75 | + } | |
| 76 | + return desKey; | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Returns a specification (key material) of the given key | |
| 81 | + * in the requested format. | |
| 82 | + * | |
| 83 | + * @param key the key | |
| 84 | + * | |
| 85 | + * @param keySpec the requested format in which the key material shall be | |
| 86 | + * returned | |
| 87 | + * | |
| 88 | + * @return the underlying key specification (key material) in the | |
| 89 | + * requested format | |
| 90 | + * | |
| 91 | + * @exception InvalidKeySpecException if the requested key specification is | |
| 92 | + * inappropriate for the given key, or the given key cannot be processed | |
| 93 | + * (e.g., the given key has an unrecognized algorithm or format). | |
| 94 | + */ | |
| 95 | + protected KeySpec engineGetKeySpec(SecretKey key, Class keySpec) | |
| 96 | + throws InvalidKeySpecException { | |
| 97 | + | |
| 98 | + try { | |
| 99 | + | |
| 100 | + if ((key instanceof SecretKey) | |
| 101 | + && (key.getAlgorithm().equalsIgnoreCase("DES")) | |
| 102 | + && (key.getFormat().equalsIgnoreCase("RAW"))) { | |
| 103 | + | |
| 104 | + // Check if requested key spec is amongst the valid ones | |
| 105 | + if ((keySpec != null) && | |
| 106 | + DESKeySpec.class.isAssignableFrom(keySpec)) { | |
| 107 | + return new DESKeySpec(key.getEncoded()); | |
| 108 | + | |
| 109 | + } else { | |
| 110 | + throw new InvalidKeySpecException | |
| 111 | + ("Inappropriate key specification"); | |
| 112 | + } | |
| 113 | + | |
| 114 | + } else { | |
| 115 | + throw new InvalidKeySpecException | |
| 116 | + ("Inappropriate key format/algorithm"); | |
| 117 | + } | |
| 118 | + | |
| 119 | + } catch (InvalidKeyException e) { | |
| 120 | + throw new InvalidKeySpecException("Secret key has wrong size"); | |
| 121 | + } | |
| 122 | + } | |
| 123 | + | |
| 124 | + /** | |
| 125 | + * Translates a <code>SecretKey</code> object, whose provider may be | |
| 126 | + * unknown or potentially untrusted, into a corresponding | |
| 127 | + * <code>SecretKey</code> object of this key factory. | |
| 128 | + * | |
| 129 | + * @param key the key whose provider is unknown or untrusted | |
| 130 | + * | |
| 131 | + * @return the translated key | |
| 132 | + * | |
| 133 | + * @exception InvalidKeyException if the given key cannot be processed by | |
| 134 | + * this key factory. | |
| 135 | + */ | |
| 136 | + protected SecretKey engineTranslateKey(SecretKey key) | |
| 137 | + throws InvalidKeyException { | |
| 138 | + | |
| 139 | + try { | |
| 140 | + | |
| 141 | + if ((key != null) && | |
| 142 | + (key.getAlgorithm().equalsIgnoreCase("DES")) && | |
| 143 | + (key.getFormat().equalsIgnoreCase("RAW"))) { | |
| 144 | + | |
| 145 | + // Check if key originates from this factory | |
| 146 | + if (key instanceof com.sun.crypto.provider.DESKey) { | |
| 147 | + return key; | |
| 148 | + } | |
| 149 | + // Convert key to spec | |
| 150 | + DESKeySpec desKeySpec | |
| 151 | + = (DESKeySpec)engineGetKeySpec(key, DESKeySpec.class); | |
| 152 | + // Create key from spec, and return it | |
| 153 | + return engineGenerateSecret(desKeySpec); | |
| 154 | + | |
| 155 | + } else { | |
| 156 | + throw new InvalidKeyException | |
| 157 | + ("Inappropriate key format/algorithm"); | |
| 158 | + } | |
| 159 | + | |
| 160 | + } catch (InvalidKeySpecException e) { | |
| 161 | + throw new InvalidKeyException("Cannot translate key"); | |
| 162 | + } | |
| 163 | + } | |
| 164 | +} | |