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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 | } | ||