J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | * Verify the SunJCE provider in the constructor. |
| 53 | * |
| 54 | * @exception SecurityException if fails to verify |
| 55 | * its own integrity |
| 56 | */ |
| 57 | public DHKeyFactory() { |
| 58 | if (!SunJCE.verifySelfIntegrity(this.getClass())) { |
| 59 | throw new SecurityException("The SunJCE provider may have " + |
| 60 | "been tampered."); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Generates a public key object from the provided key specification |
| 66 | * (key material). |
| 67 | * |
| 68 | * @param keySpec the specification (key material) of the public key |
| 69 | * |
| 70 | * @return the public key |
| 71 | * |
| 72 | * @exception InvalidKeySpecException if the given key specification |
| 73 | * is inappropriate for this key factory to produce a public key. |
| 74 | */ |
| 75 | protected PublicKey engineGeneratePublic(KeySpec keySpec) |
| 76 | throws InvalidKeySpecException |
| 77 | { |
| 78 | try { |
| 79 | if (keySpec instanceof DHPublicKeySpec) { |
| 80 | DHPublicKeySpec dhPubKeySpec = (DHPublicKeySpec)keySpec; |
| 81 | return new DHPublicKey(dhPubKeySpec.getY(), |
| 82 | dhPubKeySpec.getP(), |
| 83 | dhPubKeySpec.getG()); |
| 84 | |
| 85 | } else if (keySpec instanceof X509EncodedKeySpec) { |
| 86 | return new DHPublicKey |
| 87 | (((X509EncodedKeySpec)keySpec).getEncoded()); |
| 88 | |
| 89 | } else { |
| 90 | throw new InvalidKeySpecException |
| 91 | ("Inappropriate key specification"); |
| 92 | } |
| 93 | } catch (InvalidKeyException e) { |
| 94 | throw new InvalidKeySpecException |
| 95 | ("Inappropriate key specification"); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Generates a private key object from the provided key specification |
| 101 | * (key material). |
| 102 | * |
| 103 | * @param keySpec the specification (key material) of the private key |
| 104 | * |
| 105 | * @return the private key |
| 106 | * |
| 107 | * @exception InvalidKeySpecException if the given key specification |
| 108 | * is inappropriate for this key factory to produce a private key. |
| 109 | */ |
| 110 | protected PrivateKey engineGeneratePrivate(KeySpec keySpec) |
| 111 | throws InvalidKeySpecException |
| 112 | { |
| 113 | try { |
| 114 | if (keySpec instanceof DHPrivateKeySpec) { |
| 115 | DHPrivateKeySpec dhPrivKeySpec = (DHPrivateKeySpec)keySpec; |
| 116 | return new DHPrivateKey(dhPrivKeySpec.getX(), |
| 117 | dhPrivKeySpec.getP(), |
| 118 | dhPrivKeySpec.getG()); |
| 119 | |
| 120 | } else if (keySpec instanceof PKCS8EncodedKeySpec) { |
| 121 | return new DHPrivateKey |
| 122 | (((PKCS8EncodedKeySpec)keySpec).getEncoded()); |
| 123 | |
| 124 | } else { |
| 125 | throw new InvalidKeySpecException |
| 126 | ("Inappropriate key specification"); |
| 127 | } |
| 128 | } catch (InvalidKeyException e) { |
| 129 | throw new InvalidKeySpecException |
| 130 | ("Inappropriate key specification"); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Returns a specification (key material) of the given key object |
| 136 | * in the requested format. |
| 137 | * |
| 138 | * @param key the key |
| 139 | * |
| 140 | * @param keySpec the requested format in which the key material shall be |
| 141 | * returned |
| 142 | * |
| 143 | * @return the underlying key specification (key material) in the |
| 144 | * requested format |
| 145 | * |
| 146 | * @exception InvalidKeySpecException if the requested key specification is |
| 147 | * inappropriate for the given key, or the given key cannot be processed |
| 148 | * (e.g., the given key has an unrecognized algorithm or format). |
| 149 | */ |
| 150 | protected KeySpec engineGetKeySpec(Key key, Class keySpec) |
| 151 | throws InvalidKeySpecException { |
| 152 | DHParameterSpec params; |
| 153 | |
| 154 | if (key instanceof javax.crypto.interfaces.DHPublicKey) { |
| 155 | |
| 156 | if (DHPublicKeySpec.class.isAssignableFrom(keySpec)) { |
| 157 | javax.crypto.interfaces.DHPublicKey dhPubKey |
| 158 | = (javax.crypto.interfaces.DHPublicKey) key; |
| 159 | params = dhPubKey.getParams(); |
| 160 | return new DHPublicKeySpec(dhPubKey.getY(), |
| 161 | params.getP(), |
| 162 | params.getG()); |
| 163 | |
| 164 | } else if (X509EncodedKeySpec.class.isAssignableFrom(keySpec)) { |
| 165 | return new X509EncodedKeySpec(key.getEncoded()); |
| 166 | |
| 167 | } else { |
| 168 | throw new InvalidKeySpecException |
| 169 | ("Inappropriate key specification"); |
| 170 | } |
| 171 | |
| 172 | } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { |
| 173 | |
| 174 | if (DHPrivateKeySpec.class.isAssignableFrom(keySpec)) { |
| 175 | javax.crypto.interfaces.DHPrivateKey dhPrivKey |
| 176 | = (javax.crypto.interfaces.DHPrivateKey)key; |
| 177 | params = dhPrivKey.getParams(); |
| 178 | return new DHPrivateKeySpec(dhPrivKey.getX(), |
| 179 | params.getP(), |
| 180 | params.getG()); |
| 181 | |
| 182 | } else if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec)) { |
| 183 | return new PKCS8EncodedKeySpec(key.getEncoded()); |
| 184 | |
| 185 | } else { |
| 186 | throw new InvalidKeySpecException |
| 187 | ("Inappropriate key specification"); |
| 188 | } |
| 189 | |
| 190 | } else { |
| 191 | throw new InvalidKeySpecException("Inappropriate key type"); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Translates a key object, whose provider may be unknown or potentially |
| 197 | * untrusted, into a corresponding key object of this key factory. |
| 198 | * |
| 199 | * @param key the key whose provider is unknown or untrusted |
| 200 | * |
| 201 | * @return the translated key |
| 202 | * |
| 203 | * @exception InvalidKeyException if the given key cannot be processed by |
| 204 | * this key factory. |
| 205 | */ |
| 206 | protected Key engineTranslateKey(Key key) |
| 207 | throws InvalidKeyException |
| 208 | { |
| 209 | try { |
| 210 | |
| 211 | if (key instanceof javax.crypto.interfaces.DHPublicKey) { |
| 212 | // Check if key originates from this factory |
| 213 | if (key instanceof com.sun.crypto.provider.DHPublicKey) { |
| 214 | return key; |
| 215 | } |
| 216 | // Convert key to spec |
| 217 | DHPublicKeySpec dhPubKeySpec |
| 218 | = (DHPublicKeySpec)engineGetKeySpec |
| 219 | (key, DHPublicKeySpec.class); |
| 220 | // Create key from spec, and return it |
| 221 | return engineGeneratePublic(dhPubKeySpec); |
| 222 | |
| 223 | } else if (key instanceof javax.crypto.interfaces.DHPrivateKey) { |
| 224 | // Check if key originates from this factory |
| 225 | if (key instanceof com.sun.crypto.provider.DHPrivateKey) { |
| 226 | return key; |
| 227 | } |
| 228 | // Convert key to spec |
| 229 | DHPrivateKeySpec dhPrivKeySpec |
| 230 | = (DHPrivateKeySpec)engineGetKeySpec |
| 231 | (key, DHPrivateKeySpec.class); |
| 232 | // Create key from spec, and return it |
| 233 | return engineGeneratePrivate(dhPrivKeySpec); |
| 234 | |
| 235 | } else { |
| 236 | throw new InvalidKeyException("Wrong algorithm type"); |
| 237 | } |
| 238 | |
| 239 | } catch (InvalidKeySpecException e) { |
| 240 | throw new InvalidKeyException("Cannot translate key"); |
| 241 | } |
| 242 | } |
| 243 | } |