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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.util.*; | ||
| 29 | import java.lang.*; | ||
| 30 | import java.security.Key; | ||
| 31 | import java.security.PublicKey; | ||
| 32 | import java.security.PrivateKey; | ||
| 33 | import java.security.KeyFactorySpi; | ||
| 34 | import java.security.InvalidKeyException; | ||
| 35 | import java.security.spec.KeySpec; | ||
| 36 | import java.security.spec.InvalidKeySpecException; | ||
| 37 | import java.security.spec.X509EncodedKeySpec; | ||
| 38 | import java.security.spec.PKCS8EncodedKeySpec; | ||
| 39 | import javax.crypto.spec.DHPublicKeySpec; | ||
| 40 | import javax.crypto.spec.DHPrivateKeySpec; | ||
| 41 | import javax.crypto.spec.DHParameterSpec; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * This class implements the Diffie-Hellman key factory of the Sun provider. | ||
| 45 | * | ||
| 46 | * @author Jan Luehe | ||
| 47 | * | ||
| 48 | */ | ||
| 49 | public final class DHKeyFactory extends KeyFactorySpi { | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Empty constructor | ||
| 53 | */ | ||
| 54 | public DHKeyFactory() { | ||
| 55 | } | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Generates a public key object from the provided key specification | ||
| 59 | * (key material). | ||
| 60 | * | ||
| 61 | * @param keySpec the specification (key material) of the public key | ||
| 62 | * | ||
| 63 | * @return the public key | ||
| 64 | * | ||
| 65 | * @exception InvalidKeySpecException if the given key specification | ||
| 66 | * is inappropriate for this key factory to produce a public key. | ||
| 67 | */ | ||
| 68 | protected PublicKey engineGeneratePublic(KeySpec keySpec) | ||
| 69 | throws InvalidKeySpecException | ||
| 70 | { | ||
| 71 | try { | ||
| 72 | if (keySpec instanceof DHPublicKeySpec) { | ||
| 73 | DHPublicKeySpec dhPubKeySpec = (DHPublicKeySpec)keySpec; | ||
| 74 | return new DHPublicKey(dhPubKeySpec.getY(), | ||
| 75 | dhPubKeySpec.getP(), | ||
| 76 | dhPubKeySpec.getG()); | ||
| 77 | |||
| 78 | } else if (keySpec instanceof X509EncodedKeySpec) { | ||
| 79 | return new DHPublicKey | ||
| 80 | (((X509EncodedKeySpec)keySpec).getEncoded()); | ||
| 81 | |||
| 82 | } else { | ||
| 83 | throw new InvalidKeySpecException | ||
| 84 | ("Inappropriate key specification"); | ||
| 85 | } | ||
| 86 | } catch (InvalidKeyException e) { | ||
| 87 | throw new InvalidKeySpecException | ||
| 88 | ("Inappropriate key specification"); | ||
| 89 | } | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Generates a private key object from the provided key specification | ||
| 94 | * (key material). | ||
| 95 | * | ||
| 96 | * @param keySpec the specification (key material) of the private key | ||
| 97 | * | ||
| 98 | * @return the private key | ||
| 99 | * | ||
| 100 | * @exception InvalidKeySpecException if the given key specification | ||
| 101 | * is inappropriate for this key factory to produce a private key. | ||
| 102 | */ | ||
| 103 | protected PrivateKey engineGeneratePrivate(KeySpec keySpec) | ||
| 104 | throws InvalidKeySpecException | ||
| 105 | { | ||
| 106 | try { | ||
| 107 | if (keySpec instanceof DHPrivateKeySpec) { | ||
| 108 | DHPrivateKeySpec dhPrivKeySpec = (DHPrivateKeySpec)keySpec; | ||
| 109 | return new DHPrivateKey(dhPrivKeySpec.getX(), | ||
| 110 | dhPrivKeySpec.getP(), | ||
| 111 | dhPrivKeySpec.getG()); | ||
| 112 | |||
| 113 | } else if (keySpec instanceof PKCS8EncodedKeySpec) { | ||
| 114 | return new DHPrivateKey | ||
| 115 | (((PKCS8EncodedKeySpec)keySpec).getEncoded()); | ||
| 116 | |||
| 117 | } else { | ||
| 118 | throw new InvalidKeySpecException | ||
| 119 | ("Inappropriate key specification"); | ||
| 120 | } | ||
| 121 | } catch (InvalidKeyException e) { | ||
| 122 | throw new InvalidKeySpecException | ||
| 123 | ("Inappropriate key specification"); | ||
| 124 | } | ||
| 125 | } | ||
| 126 | |||
| 127 | /** | ||
| 128 | * Returns a specification (key material) of the given key object | ||
| 129 | * in the requested format. | ||
| 130 | * | ||
| 131 | * @param key the key | ||
| 132 | * | ||
| 133 | * @param keySpec the requested format in which the key material shall be | ||
| 134 | * returned | ||
| 135 | * | ||
| 136 | * @return the underlying key specification (key material) in the | ||
| 137 | * requested format | ||
| 138 | * | ||
| 139 | * @exception InvalidKeySpecException if the requested key specification is | ||
| 140 | * inappropriate for the given key, or the given key cannot be processed | ||
| 141 | * (e.g., the given key has an unrecognized algorithm or format). | ||
| 142 | */ | ||
| 143 | protected KeySpec engineGetKeySpec(Key key, Class keySpec) | ||
| 144 | throws InvalidKeySpecException { | ||
| 145 | DHParameterSpec params; | ||
| 146 | |||
| 147 | if (key instanceof javax.crypto.interfaces.DHPublicKey) { | ||
| 148 | |||
| 149 | if (DHPublicKeySpec.class.isAssignableFrom(keySpec)) { | ||
| 150 | javax.crypto.interfaces.DHPublicKey dhPubKey | ||
| 151 | = (javax.crypto.interfaces.DHPublicKey) key; | ||
| 152 | params = dhPubKey.getParams(); | ||
| 153 | return new DHPublicKeySpec(dhPubKey.getY(), | ||
| 154 | params.getP(), | ||
| 155 | params.getG()); | ||
| 156 | |||
| 157 | } else if (X509EncodedKeySpec.class.isAssignableFrom(keySpec)) { | ||
| 158 | return new X509EncodedKeySpec(key.getEncoded()); | ||
| 159 | |||
| 160 | } else { | ||
| 161 | throw new InvalidKeySpecException | ||
| 162 | ("Inappropriate key specification"); | ||
| 163 | } | ||
| 164 | |||
| 165 | } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { | ||
| 166 | |||
| 167 | if (DHPrivateKeySpec.class.isAssignableFrom(keySpec)) { | ||
| 168 | javax.crypto.interfaces.DHPrivateKey dhPrivKey | ||
| 169 | = (javax.crypto.interfaces.DHPrivateKey)key; | ||
| 170 | params = dhPrivKey.getParams(); | ||
| 171 | return new DHPrivateKeySpec(dhPrivKey.getX(), | ||
| 172 | params.getP(), | ||
| 173 | params.getG()); | ||
| 174 | |||
| 175 | } else if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec)) { | ||
| 176 | return new PKCS8EncodedKeySpec(key.getEncoded()); | ||
| 177 | |||
| 178 | } else { | ||
| 179 | throw new InvalidKeySpecException | ||
| 180 | ("Inappropriate key specification"); | ||
| 181 | } | ||
| 182 | |||
| 183 | } else { | ||
| 184 | throw new InvalidKeySpecException("Inappropriate key type"); | ||
| 185 | } | ||
| 186 | } | ||
| 187 | |||
| 188 | /** | ||
| 189 | * Translates a key object, whose provider may be unknown or potentially | ||
| 190 | * untrusted, into a corresponding key object of this key factory. | ||
| 191 | * | ||
| 192 | * @param key the key whose provider is unknown or untrusted | ||
| 193 | * | ||
| 194 | * @return the translated key | ||
| 195 | * | ||
| 196 | * @exception InvalidKeyException if the given key cannot be processed by | ||
| 197 | * this key factory. | ||
| 198 | */ | ||
| 199 | protected Key engineTranslateKey(Key key) | ||
| 200 | throws InvalidKeyException | ||
| 201 | { | ||
| 202 | try { | ||
| 203 | |||
| 204 | if (key instanceof javax.crypto.interfaces.DHPublicKey) { | ||
| 205 | // Check if key originates from this factory | ||
| 206 | if (key instanceof com.sun.crypto.provider.DHPublicKey) { | ||
| 207 | return key; | ||
| 208 | } | ||
| 209 | // Convert key to spec | ||
| 210 | DHPublicKeySpec dhPubKeySpec | ||
| 211 | = (DHPublicKeySpec)engineGetKeySpec | ||
| 212 | (key, DHPublicKeySpec.class); | ||
| 213 | // Create key from spec, and return it | ||
| 214 | return engineGeneratePublic(dhPubKeySpec); | ||
| 215 | |||
| 216 | } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { | ||
| 217 | // Check if key originates from this factory | ||
| 218 | if (key instanceof com.sun.crypto.provider.DHPrivateKey) { | ||
| 219 | return key; | ||
| 220 | } | ||
| 221 | // Convert key to spec | ||
| 222 | DHPrivateKeySpec dhPrivKeySpec | ||
| 223 | = (DHPrivateKeySpec)engineGetKeySpec | ||
| 224 | (key, DHPrivateKeySpec.class); | ||
| 225 | // Create key from spec, and return it | ||
| 226 | return engineGeneratePrivate(dhPrivKeySpec); | ||
| 227 | |||
| 228 | } else { | ||
| 229 | throw new InvalidKeyException("Wrong algorithm type"); | ||
| 230 | } | ||
| 231 | |||
| 232 | } catch (InvalidKeySpecException e) { | ||
| 233 | throw new InvalidKeyException("Cannot translate key"); | ||
| 234 | } | ||
| 235 | } | ||
| 236 | } | ||