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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2011, 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 javax.crypto; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | |||
| 30 | import java.security.*; | ||
| 31 | import java.security.Provider.Service; | ||
| 32 | import java.security.spec.*; | ||
| 33 | |||
| 34 | import sun.security.jca.*; | ||
| 35 | import sun.security.jca.GetInstance.Instance; | ||
| 36 | |||
| 37 | /** | ||
| 38 | * This class provides the functionality of a secret (symmetric) key generator. | ||
| 39 | * | ||
| 40 | * <p>Key generators are constructed using one of the <code>getInstance</code> | ||
| 41 | * class methods of this class. | ||
| 42 | * | ||
| 43 | * <p>KeyGenerator objects are reusable, i.e., after a key has been | ||
| 44 | * generated, the same KeyGenerator object can be re-used to generate further | ||
| 45 | * keys. | ||
| 46 | * | ||
| 47 | * <p>There are two ways to generate a key: in an algorithm-independent | ||
| 48 | * manner, and in an algorithm-specific manner. | ||
| 49 | * The only difference between the two is the initialization of the object: | ||
| 50 | * | ||
| 51 | * <ul> | ||
| 52 | * <li><b>Algorithm-Independent Initialization</b> | ||
| 53 | * <p>All key generators share the concepts of a <i>keysize</i> and a | ||
| 54 | * <i>source of randomness</i>. | ||
| 55 | * There is an | ||
| 56 | * {@link #init(int, java.security.SecureRandom) init} | ||
| 57 | * method in this KeyGenerator class that takes these two universally | ||
| 58 | * shared types of arguments. There is also one that takes just a | ||
| 59 | * <code>keysize</code> argument, and uses the SecureRandom implementation | ||
| 60 | * of the highest-priority installed provider as the source of randomness | ||
| 61 | * (or a system-provided source of randomness if none of the installed | ||
| 62 | * providers supply a SecureRandom implementation), and one that takes just a | ||
| 63 | * source of randomness. | ||
| 64 | * | ||
| 65 | * <p>Since no other parameters are specified when you call the above | ||
| 66 | * algorithm-independent <code>init</code> methods, it is up to the | ||
| 67 | * provider what to do about the algorithm-specific parameters (if any) to be | ||
| 68 | * associated with each of the keys. | ||
| 69 | * <p> | ||
| 70 | * | ||
| 71 | * <li><b>Algorithm-Specific Initialization</b> | ||
| 72 | * <p>For situations where a set of algorithm-specific parameters already | ||
| 73 | * exists, there are two | ||
| 74 | * {@link #init(java.security.spec.AlgorithmParameterSpec) init} | ||
| 75 | * methods that have an <code>AlgorithmParameterSpec</code> | ||
| 76 | * argument. One also has a <code>SecureRandom</code> argument, while the | ||
| 77 | * other uses the SecureRandom implementation | ||
| 78 | * of the highest-priority installed provider as the source of randomness | ||
| 79 | * (or a system-provided source of randomness if none of the installed | ||
| 80 | * providers supply a SecureRandom implementation). | ||
| 81 | * </ul> | ||
| 82 | * | ||
| 83 | * <p>In case the client does not explicitly initialize the KeyGenerator | ||
| 84 | * (via a call to an <code>init</code> method), each provider must | ||
| 85 | * supply (and document) a default initialization. | ||
| 86 | * | ||
| 87 | * <p> Every implementation of the Java platform is required to support the | ||
| 88 | * following standard <code>KeyGenerator</code> algorithms with the keysizes in | ||
| 89 | * parentheses: | ||
| 90 | * <ul> | ||
| 91 | * <li><tt>AES</tt> (128)</li> | ||
| 92 | * <li><tt>DES</tt> (56)</li> | ||
| 93 | * <li><tt>DESede</tt> (168)</li> | ||
| 94 | * <li><tt>HmacSHA1</tt></li> | ||
| 95 | * <li><tt>HmacSHA256</tt></li> | ||
| 96 | * </ul> | ||
| 97 | * These algorithms are described in the <a href= | ||
| 98 | * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyGenerator"> | ||
| 99 | * KeyGenerator section</a> of the | ||
| 100 | * Java Cryptography Architecture Standard Algorithm Name Documentation. | ||
| 101 | * Consult the release documentation for your implementation to see if any | ||
| 102 | * other algorithms are supported. | ||
| 103 | * | ||
| 104 | * @author Jan Luehe | ||
| 105 | * | ||
| 106 | * @see SecretKey | ||
| 107 | * @since 1.4 | ||
| 108 | */ | ||
| 109 | |||
| 110 | public class KeyGenerator { | ||
| 111 | |||
| 112 | // see java.security.KeyPairGenerator for failover notes | ||
| 113 | |||
| 114 | private final static int I_NONE = 1; | ||
| 115 | private final static int I_RANDOM = 2; | ||
| 116 | private final static int I_PARAMS = 3; | ||
| 117 | private final static int I_SIZE = 4; | ||
| 118 | |||
| 119 | // The provider | ||
| 120 | private Provider provider; | ||
| 121 | |||
| 122 | // The provider implementation (delegate) | ||
| 123 | private volatile KeyGeneratorSpi spi; | ||
| 124 | |||
| 125 | // The algorithm | ||
| 126 | private final String algorithm; | ||
| 127 | |||
| 128 | private final Object lock = new Object(); | ||
| 129 | |||
| 130 | private Iterator serviceIterator; | ||
| 131 | |||
| 132 | private int initType; | ||
| 133 | private int initKeySize; | ||
| 134 | private AlgorithmParameterSpec initParams; | ||
| 135 | private SecureRandom initRandom; | ||
| 136 | |||
| 137 | /** | ||
| 138 | * Creates a KeyGenerator object. | ||
| 139 | * | ||
| 140 | * @param keyGenSpi the delegate | ||
| 141 | * @param provider the provider | ||
| 142 | * @param algorithm the algorithm | ||
| 143 | */ | ||
| 144 | protected KeyGenerator(KeyGeneratorSpi keyGenSpi, Provider provider, | ||
| 145 | String algorithm) { | ||
| 146 | this.spi = keyGenSpi; | ||
| 147 | this.provider = provider; | ||
| 148 | this.algorithm = algorithm; | ||
| 149 | } | ||
| 150 | |||
| 151 | private KeyGenerator(String algorithm) throws NoSuchAlgorithmException { | ||
| 152 | this.algorithm = algorithm; | ||
| 153 | List list = GetInstance.getServices("KeyGenerator", algorithm); | ||
| 154 | serviceIterator = list.iterator(); | ||
| 155 | initType = I_NONE; | ||
| 156 | // fetch and instantiate initial spi | ||
| 157 | if (nextSpi(null, false) == null) { | ||
| 158 | throw new NoSuchAlgorithmException | ||
| 159 | (algorithm + " KeyGenerator not available"); | ||
| 160 | } | ||
| 161 | } | ||
| 162 | |||
| 163 | /** | ||
| 164 | * Returns the algorithm name of this <code>KeyGenerator</code> object. | ||
| 165 | * | ||
| 166 | * <p>This is the same name that was specified in one of the | ||
| 167 | * <code>getInstance</code> calls that created this | ||
| 168 | * <code>KeyGenerator</code> object. | ||
| 169 | * | ||
| 170 | * @return the algorithm name of this <code>KeyGenerator</code> object. | ||
| 171 | */ | ||
| 172 | public final String getAlgorithm() { | ||
| 173 | return this.algorithm; | ||
| 174 | } | ||
| 175 | |||
| 176 | /** | ||
| 177 | * Returns a <code>KeyGenerator</code> object that generates secret keys | ||
| 178 | * for the specified algorithm. | ||
| 179 | * | ||
| 180 | * <p> This method traverses the list of registered security Providers, | ||
| 181 | * starting with the most preferred Provider. | ||
| 182 | * A new KeyGenerator object encapsulating the | ||
| 183 | * KeyGeneratorSpi implementation from the first | ||
| 184 | * Provider that supports the specified algorithm is returned. | ||
| 185 | * | ||
| 186 | * <p> Note that the list of registered providers may be retrieved via | ||
| 187 | * the {@link Security#getProviders() Security.getProviders()} method. | ||
| 188 | * | ||
| 189 | * @param algorithm the standard name of the requested key algorithm. | ||
| 190 | * See the KeyGenerator section in the <a href= | ||
| 191 | * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyGenerator"> | ||
| 192 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 193 | * for information about standard algorithm names. | ||
| 194 | * | ||
| 195 | * @return the new <code>KeyGenerator</code> object. | ||
| 196 | * | ||
| 197 | * @exception NullPointerException if the specified algorithm is null. | ||
| 198 | * | ||
| 199 | * @exception NoSuchAlgorithmException if no Provider supports a | ||
| 200 | * KeyGeneratorSpi implementation for the | ||
| 201 | * specified algorithm. | ||
| 202 | * | ||
| 203 | * @see java.security.Provider | ||
| 204 | */ | ||
| 205 | public static final KeyGenerator getInstance(String algorithm) | ||
| 206 | throws NoSuchAlgorithmException { | ||
| 207 | return new KeyGenerator(algorithm); | ||
| 208 | } | ||
| 209 | |||
| 210 | /** | ||
| 211 | * Returns a <code>KeyGenerator</code> object that generates secret keys | ||
| 212 | * for the specified algorithm. | ||
| 213 | * | ||
| 214 | * <p> A new KeyGenerator object encapsulating the | ||
| 215 | * KeyGeneratorSpi implementation from the specified provider | ||
| 216 | * is returned. The specified provider must be registered | ||
| 217 | * in the security provider list. | ||
| 218 | * | ||
| 219 | * <p> Note that the list of registered providers may be retrieved via | ||
| 220 | * the {@link Security#getProviders() Security.getProviders()} method. | ||
| 221 | * | ||
| 222 | * @param algorithm the standard name of the requested key algorithm. | ||
| 223 | * See the KeyGenerator section in the <a href= | ||
| 224 | * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyGenerator"> | ||
| 225 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 226 | * for information about standard algorithm names. | ||
| 227 | * | ||
| 228 | * @param provider the name of the provider. | ||
| 229 | * | ||
| 230 | * @return the new <code>KeyGenerator</code> object. | ||
| 231 | * | ||
| 232 | * @exception NullPointerException if the specified algorithm is null. | ||
| 233 | * | ||
| 234 | * @exception NoSuchAlgorithmException if a KeyGeneratorSpi | ||
| 235 | * implementation for the specified algorithm is not | ||
| 236 | * available from the specified provider. | ||
| 237 | * | ||
| 238 | * @exception NoSuchProviderException if the specified provider is not | ||
| 239 | * registered in the security provider list. | ||
| 240 | * | ||
| 241 | * @exception IllegalArgumentException if the <code>provider</code> | ||
| 242 | * is null or empty. | ||
| 243 | * | ||
| 244 | * @see java.security.Provider | ||
| 245 | */ | ||
| 246 | public static final KeyGenerator getInstance(String algorithm, | ||
| 247 | String provider) throws NoSuchAlgorithmException, | ||
| 248 | NoSuchProviderException { | ||
| 249 | Instance instance = JceSecurity.getInstance("KeyGenerator", | ||
| 250 | KeyGeneratorSpi.class, algorithm, provider); | ||
| 251 | return new KeyGenerator((KeyGeneratorSpi)instance.impl, | ||
| 252 | instance.provider, algorithm); | ||
| 253 | } | ||
| 254 | |||
| 255 | /** | ||
| 256 | * Returns a <code>KeyGenerator</code> object that generates secret keys | ||
| 257 | * for the specified algorithm. | ||
| 258 | * | ||
| 259 | * <p> A new KeyGenerator object encapsulating the | ||
| 260 | * KeyGeneratorSpi implementation from the specified Provider | ||
| 261 | * object is returned. Note that the specified Provider object | ||
| 262 | * does not have to be registered in the provider list. | ||
| 263 | * | ||
| 264 | * @param algorithm the standard name of the requested key algorithm. | ||
| 265 | * See the KeyGenerator section in the <a href= | ||
| 266 | * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyGenerator"> | ||
| 267 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 268 | * for information about standard algorithm names. | ||
| 269 | * | ||
| 270 | * @param provider the provider. | ||
| 271 | * | ||
| 272 | * @return the new <code>KeyGenerator</code> object. | ||
| 273 | * | ||
| 274 | * @exception NullPointerException if the specified algorithm is null. | ||
| 275 | * | ||
| 276 | * @exception NoSuchAlgorithmException if a KeyGeneratorSpi | ||
| 277 | * implementation for the specified algorithm is not available | ||
| 278 | * from the specified Provider object. | ||
| 279 | * | ||
| 280 | * @exception IllegalArgumentException if the <code>provider</code> | ||
| 281 | * is null. | ||
| 282 | * | ||
| 283 | * @see java.security.Provider | ||
| 284 | */ | ||
| 285 | public static final KeyGenerator getInstance(String algorithm, | ||
| 286 | Provider provider) throws NoSuchAlgorithmException { | ||
| 287 | Instance instance = JceSecurity.getInstance("KeyGenerator", | ||
| 288 | KeyGeneratorSpi.class, algorithm, provider); | ||
| 289 | return new KeyGenerator((KeyGeneratorSpi)instance.impl, | ||
| 290 | instance.provider, algorithm); | ||
| 291 | } | ||
| 292 | |||
| 293 | /** | ||
| 294 | * Returns the provider of this <code>KeyGenerator</code> object. | ||
| 295 | * | ||
| 296 | * @return the provider of this <code>KeyGenerator</code> object | ||
| 297 | */ | ||
| 298 | public final Provider getProvider() { | ||
| 299 | synchronized (lock) { | ||
| 300 | disableFailover(); | ||
| 301 | return provider; | ||
| 302 | } | ||
| 303 | } | ||
| 304 | |||
| 305 | /** | ||
| 306 | * Update the active spi of this class and return the next | ||
| 307 | * implementation for failover. If no more implemenations are | ||
| 308 | * available, this method returns null. However, the active spi of | ||
| 309 | * this class is never set to null. | ||
| 310 | */ | ||
| 311 | private KeyGeneratorSpi nextSpi(KeyGeneratorSpi oldSpi, | ||
| 312 | boolean reinit) { | ||
| 313 | synchronized (lock) { | ||
| 314 | // somebody else did a failover concurrently | ||
| 315 | // try that spi now | ||
| 316 | if ((oldSpi != null) && (oldSpi != spi)) { | ||
| 317 | return spi; | ||
| 318 | } | ||
| 319 | if (serviceIterator == null) { | ||
| 320 | return null; | ||
| 321 | } | ||
| 322 | while (serviceIterator.hasNext()) { | ||
| 323 | Service s = (Service)serviceIterator.next(); | ||
| 324 | if (JceSecurity.canUseProvider(s.getProvider()) == false) { | ||
| 325 | continue; | ||
| 326 | } | ||
| 327 | try { | ||
| 328 | Object inst = s.newInstance(null); | ||
| 329 | // ignore non-spis | ||
| 330 | if (inst instanceof KeyGeneratorSpi == false) { | ||
| 331 | continue; | ||
| 332 | } | ||
| 333 | KeyGeneratorSpi spi = (KeyGeneratorSpi)inst; | ||
| 334 | if (reinit) { | ||
| 335 | if (initType == I_SIZE) { | ||
| 336 | spi.engineInit(initKeySize, initRandom); | ||
| 337 | } else if (initType == I_PARAMS) { | ||
| 338 | spi.engineInit(initParams, initRandom); | ||
| 339 | } else if (initType == I_RANDOM) { | ||
| 340 | spi.engineInit(initRandom); | ||
| 341 | } else if (initType != I_NONE) { | ||
| 342 | throw new AssertionError | ||
| 343 | ("KeyGenerator initType: " + initType); | ||
| 344 | } | ||
| 345 | } | ||
| 346 | provider = s.getProvider(); | ||
| 347 | this.spi = spi; | ||
| 348 | return spi; | ||
| 349 | } catch (Exception e) { | ||
| 350 | // ignore | ||
| 351 | } | ||
| 352 | } | ||
| 353 | disableFailover(); | ||
| 354 | return null; | ||
| 355 | } | ||
| 356 | } | ||
| 357 | |||
| 358 | void disableFailover() { | ||
| 359 | serviceIterator = null; | ||
| 360 | initType = 0; | ||
| 361 | initParams = null; | ||
| 362 | initRandom = null; | ||
| 363 | } | ||
| 364 | |||
| 365 | /** | ||
| 366 | * Initializes this key generator. | ||
| 367 | * | ||
| 368 | * @param random the source of randomness for this generator | ||
| 369 | */ | ||
| 370 | public final void init(SecureRandom random) { | ||
| 371 | if (serviceIterator == null) { | ||
| 372 | spi.engineInit(random); | ||
| 373 | return; | ||
| 374 | } | ||
| 375 | RuntimeException failure = null; | ||
| 376 | KeyGeneratorSpi mySpi = spi; | ||
| 377 | do { | ||
| 378 | try { | ||
| 379 | mySpi.engineInit(random); | ||
| 380 | initType = I_RANDOM; | ||
| 381 | initKeySize = 0; | ||
| 382 | initParams = null; | ||
| 383 | initRandom = random; | ||
| 384 | return; | ||
| 385 | } catch (RuntimeException e) { | ||
| 386 | if (failure == null) { | ||
| 387 | failure = e; | ||
| 388 | } | ||
| 389 | mySpi = nextSpi(mySpi, false); | ||
| 390 | } | ||
| 391 | } while (mySpi != null); | ||
| 392 | throw failure; | ||
| 393 | } | ||
| 394 | |||
| 395 | /** | ||
| 396 | * Initializes this key generator with the specified parameter set. | ||
| 397 | * | ||
| 398 | * <p> If this key generator requires any random bytes, it will get them | ||
| 399 | * using the | ||
| 400 | * {@link SecureRandom <code>SecureRandom</code>} | ||
| 401 | * implementation of the highest-priority installed | ||
| 402 | * provider as the source of randomness. | ||
| 403 | * (If none of the installed providers supply an implementation of | ||
| 404 | * SecureRandom, a system-provided source of randomness will be used.) | ||
| 405 | * | ||
| 406 | * @param params the key generation parameters | ||
| 407 | * | ||
| 408 | * @exception InvalidAlgorithmParameterException if the given parameters | ||
| 409 | * are inappropriate for this key generator | ||
| 410 | */ | ||
| 411 | public final void init(AlgorithmParameterSpec params) | ||
| 412 | throws InvalidAlgorithmParameterException | ||
| 413 | { | ||
| 414 | init(params, JceSecurity.RANDOM); | ||
| 415 | } | ||
| 416 | |||
| 417 | /** | ||
| 418 | * Initializes this key generator with the specified parameter | ||
| 419 | * set and a user-provided source of randomness. | ||
| 420 | * | ||
| 421 | * @param params the key generation parameters | ||
| 422 | * @param random the source of randomness for this key generator | ||
| 423 | * | ||
| 424 | * @exception InvalidAlgorithmParameterException if <code>params</code> is | ||
| 425 | * inappropriate for this key generator | ||
| 426 | */ | ||
| 427 | public final void init(AlgorithmParameterSpec params, SecureRandom random) | ||
| 428 | throws InvalidAlgorithmParameterException | ||
| 429 | { | ||
| 430 | if (serviceIterator == null) { | ||
| 431 | spi.engineInit(params, random); | ||
| 432 | return; | ||
| 433 | } | ||
| 434 | Exception failure = null; | ||
| 435 | KeyGeneratorSpi mySpi = spi; | ||
| 436 | do { | ||
| 437 | try { | ||
| 438 | mySpi.engineInit(params, random); | ||
| 439 | initType = I_PARAMS; | ||
| 440 | initKeySize = 0; | ||
| 441 | initParams = params; | ||
| 442 | initRandom = random; | ||
| 443 | return; | ||
| 444 | } catch (Exception e) { | ||
| 445 | if (failure == null) { | ||
| 446 | failure = e; | ||
| 447 | } | ||
| 448 | mySpi = nextSpi(mySpi, false); | ||
| 449 | } | ||
| 450 | } while (mySpi != null); | ||
| 451 | if (failure instanceof InvalidAlgorithmParameterException) { | ||
| 452 | throw (InvalidAlgorithmParameterException)failure; | ||
| 453 | } | ||
| 454 | if (failure instanceof RuntimeException) { | ||
| 455 | throw (RuntimeException)failure; | ||
| 456 | } | ||
| 457 | throw new InvalidAlgorithmParameterException("init() failed", failure); | ||
| 458 | } | ||
| 459 | |||
| 460 | /** | ||
| 461 | * Initializes this key generator for a certain keysize. | ||
| 462 | * | ||
| 463 | * <p> If this key generator requires any random bytes, it will get them | ||
| 464 | * using the | ||
| 465 | * {@link SecureRandom <code>SecureRandom</code>} | ||
| 466 | * implementation of the highest-priority installed | ||
| 467 | * provider as the source of randomness. | ||
| 468 | * (If none of the installed providers supply an implementation of | ||
| 469 | * SecureRandom, a system-provided source of randomness will be used.) | ||
| 470 | * | ||
| 471 | * @param keysize the keysize. This is an algorithm-specific metric, | ||
| 472 | * specified in number of bits. | ||
| 473 | * | ||
| 474 | * @exception InvalidParameterException if the keysize is wrong or not | ||
| 475 | * supported. | ||
| 476 | */ | ||
| 477 | public final void init(int keysize) { | ||
| 478 | init(keysize, JceSecurity.RANDOM); | ||
| 479 | } | ||
| 480 | |||
| 481 | /** | ||
| 482 | * Initializes this key generator for a certain keysize, using a | ||
| 483 | * user-provided source of randomness. | ||
| 484 | * | ||
| 485 | * @param keysize the keysize. This is an algorithm-specific metric, | ||
| 486 | * specified in number of bits. | ||
| 487 | * @param random the source of randomness for this key generator | ||
| 488 | * | ||
| 489 | * @exception InvalidParameterException if the keysize is wrong or not | ||
| 490 | * supported. | ||
| 491 | */ | ||
| 492 | public final void init(int keysize, SecureRandom random) { | ||
| 493 | if (serviceIterator == null) { | ||
| 494 | spi.engineInit(keysize, random); | ||
| 495 | return; | ||
| 496 | } | ||
| 497 | RuntimeException failure = null; | ||
| 498 | KeyGeneratorSpi mySpi = spi; | ||
| 499 | do { | ||
| 500 | try { | ||
| 501 | mySpi.engineInit(keysize, random); | ||
| 502 | initType = I_SIZE; | ||
| 503 | initKeySize = keysize; | ||
| 504 | initParams = null; | ||
| 505 | initRandom = random; | ||
| 506 | return; | ||
| 507 | } catch (RuntimeException e) { | ||
| 508 | if (failure == null) { | ||
| 509 | failure = e; | ||
| 510 | } | ||
| 511 | mySpi = nextSpi(mySpi, false); | ||
| 512 | } | ||
| 513 | } while (mySpi != null); | ||
| 514 | throw failure; | ||
| 515 | } | ||
| 516 | |||
| 517 | /** | ||
| 518 | * Generates a secret key. | ||
| 519 | * | ||
| 520 | * @return the new key | ||
| 521 | */ | ||
| 522 | public final SecretKey generateKey() { | ||
| 523 | if (serviceIterator == null) { | ||
| 524 | return spi.engineGenerateKey(); | ||
| 525 | } | ||
| 526 | RuntimeException failure = null; | ||
| 527 | KeyGeneratorSpi mySpi = spi; | ||
| 528 | do { | ||
| 529 | try { | ||
| 530 | return mySpi.engineGenerateKey(); | ||
| 531 | } catch (RuntimeException e) { | ||
| 532 | if (failure == null) { | ||
| 533 | failure = e; | ||
| 534 | } | ||
| 535 | mySpi = nextSpi(mySpi, true); | ||
| 536 | } | ||
| 537 | } while (mySpi != null); | ||
| 538 | throw failure; | ||
| 539 | } | ||
| 540 | } | ||