1 /*
2 * Copyright (c) 1997, 2016, 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
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23 * questions.
24 */
25
26 package java.security;
27
28 import java.util.*;
29
30 import java.security.spec.AlgorithmParameterSpec;
31
32 import java.security.Provider.Service;
33
34 import sun.security.jca.*;
35 import sun.security.jca.GetInstance.Instance;
36 import sun.security.util.Debug;
37
38 /**
39 * The KeyPairGenerator class is used to generate pairs of
40 * public and private keys. Key pair generators are constructed using the
41 * {@code getInstance} factory methods (static methods that
42 * return instances of a given class).
43 *
44 * <p>A Key pair generator for a particular algorithm creates a public/private
45 * key pair that can be used with this algorithm. It also associates
46 * algorithm-specific parameters with each of the generated keys.
47 *
48 * <p>There are two ways to generate a key pair: in an algorithm-independent
49 * manner, and in an algorithm-specific manner.
50 * The only difference between the two is the initialization of the object:
51 *
52 * <ul>
53 * <li><b>Algorithm-Independent Initialization</b>
54 * <p>All key pair generators share the concepts of a keysize and a
55 * source of randomness. The keysize is interpreted differently for different
56 * algorithms (e.g., in the case of the <i>DSA</i> algorithm, the keysize
57 * corresponds to the length of the modulus).
58 * There is an
59 * {@link #initialize(int, java.security.SecureRandom) initialize}
60 * method in this KeyPairGenerator class that takes these two universally
61 * shared types of arguments. There is also one that takes just a
62 * {@code keysize} argument, and uses the {@code SecureRandom}
63 * implementation of the highest-priority installed provider as the source
64 * of randomness. (If none of the installed providers supply an implementation
65 * of {@code SecureRandom}, a system-provided source of randomness is
66 * used.)
67 *
68 * <p>Since no other parameters are specified when you call the above
69 * algorithm-independent {@code initialize} methods, it is up to the
70 * provider what to do about the algorithm-specific parameters (if any) to be
71 * associated with each of the keys.
72 *
73 * <p>If the algorithm is the <i>DSA</i> algorithm, and the keysize (modulus
74 * size) is 512, 768, 1024, or 2048, then the <i>Sun</i> provider uses a set of
75 * precomputed values for the {@code p}, {@code q}, and
76 * {@code g} parameters. If the modulus size is not one of the above
77 * values, the <i>Sun</i> provider creates a new set of parameters. Other
78 * providers might have precomputed parameter sets for more than just the
79 * modulus sizes mentioned above. Still others might not have a list of
80 * precomputed parameters at all and instead always create new parameter sets.
81 *
82 * <li><b>Algorithm-Specific Initialization</b>
83 * <p>For situations where a set of algorithm-specific parameters already
84 * exists (e.g., so-called <i>community parameters</i> in DSA), there are two
85 * {@link #initialize(java.security.spec.AlgorithmParameterSpec)
86 * initialize} methods that have an {@code AlgorithmParameterSpec}
87 * argument. One also has a {@code SecureRandom} argument, while the
88 * the other uses the {@code SecureRandom}
89 * implementation of the highest-priority installed provider as the source
90 * of randomness. (If none of the installed providers supply an implementation
91 * of {@code SecureRandom}, a system-provided source of randomness is
92 * used.)
93 * </ul>
94 *
95 * <p>In case the client does not explicitly initialize the KeyPairGenerator
96 * (via a call to an {@code initialize} method), each provider must
97 * supply (and document) a default initialization.
98 * For example, the <i>Sun</i> provider uses a default modulus size (keysize)
99 * of 1024 bits for DSA key pairs.
100 *
101 * <p>Note that this class is abstract and extends from
102 * {@code KeyPairGeneratorSpi} for historical reasons.
103 * Application developers should only take notice of the methods defined in
104 * this {@code KeyPairGenerator} class; all the methods in
105 * the superclass are intended for cryptographic service providers who wish to
106 * supply their own implementations of key pair generators.
107 *
108 * <p> Every implementation of the Java platform is required to support the
109 * following standard {@code KeyPairGenerator} algorithms and keysizes in
110 * parentheses:
111 * <ul>
112 * <li>{@code DiffieHellman} (1024, 2048, 4096)</li>
113 * <li>{@code DSA} (1024, 2048)</li>
114 * <li>{@code RSA} (1024, 2048, 4096)</li>
115 * </ul>
116 * These algorithms are described in the <a href=
117 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
118 * KeyPairGenerator section</a> of the
119 * Java Cryptography Architecture Standard Algorithm Name Documentation.
120 * Consult the release documentation for your implementation to see if any
121 * other algorithms are supported.
122 *
123 * @author Benjamin Renaud
124 *
125 * @see java.security.spec.AlgorithmParameterSpec
126 */
127
128 public abstract class KeyPairGenerator extends KeyPairGeneratorSpi {
129
130 private static final Debug pdebug =
131 Debug.getInstance("provider", "Provider");
132 private static final boolean skipDebug =
133 Debug.isOn("engine=") && !Debug.isOn("keypairgenerator");
134
135 private final String algorithm;
136
137 // The provider
138 Provider provider;
139
140 /**
141 * Creates a KeyPairGenerator object for the specified algorithm.
142 *
143 * @param algorithm the standard string name of the algorithm.
144 * See the KeyPairGenerator section in the <a href=
145 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
146 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
147 * for information about standard algorithm names.
148 */
149 protected KeyPairGenerator(String algorithm) {
150 this.algorithm = algorithm;
151 }
152
153 /**
154 * Returns the standard name of the algorithm for this key pair generator.
155 * See the KeyPairGenerator section in the <a href=
156 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
157 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
158 * for information about standard algorithm names.
159 *
160 * @return the standard string name of the algorithm.
161 */
162 public String getAlgorithm() {
163 return this.algorithm;
164 }
165
166 private static KeyPairGenerator getInstance(Instance instance,
167 String algorithm) {
168 KeyPairGenerator kpg;
169 if (instance.impl instanceof KeyPairGenerator) {
170 kpg = (KeyPairGenerator)instance.impl;
171 } else {
172 KeyPairGeneratorSpi spi = (KeyPairGeneratorSpi)instance.impl;
173 kpg = new Delegate(spi, algorithm);
174 }
175 kpg.provider = instance.provider;
176
177 if (!skipDebug && pdebug != null) {
178 pdebug.println("KeyPairGenerator." + algorithm +
179 " algorithm from: " + kpg.provider.getName());
180 }
181
182 return kpg;
183 }
184
185 /**
186 * Returns a KeyPairGenerator object that generates public/private
187 * key pairs for the specified algorithm.
188 *
189 * <p> This method traverses the list of registered security Providers,
190 * starting with the most preferred Provider.
191 * A new KeyPairGenerator object encapsulating the
192 * KeyPairGeneratorSpi implementation from the first
193 * Provider that supports the specified algorithm is returned.
194 *
195 * <p> Note that the list of registered providers may be retrieved via
196 * the {@link Security#getProviders() Security.getProviders()} method.
197 *
198 * @implNote
199 * The JDK Reference Implementation additionally uses the
200 * {@code jdk.security.provider.preferred}
201 * {@link Security#getProperty(String) Security} property to determine
202 * the preferred provider order for the specified algorithm. This
203 * may be different than the order of providers returned by
204 * {@link Security#getProviders() Security.getProviders()}.
205 *
206 * @param algorithm the standard string name of the algorithm.
207 * See the KeyPairGenerator section in the <a href=
208 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
209 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
210 * for information about standard algorithm names.
211 *
212 * @return the new KeyPairGenerator object.
213 *
214 * @exception NoSuchAlgorithmException if no Provider supports a
215 * KeyPairGeneratorSpi implementation for the
216 * specified algorithm.
217 *
218 * @see Provider
219 */
220 public static KeyPairGenerator getInstance(String algorithm)
221 throws NoSuchAlgorithmException {
222 List<Service> list =
223 GetInstance.getServices("KeyPairGenerator", algorithm);
224 Iterator<Service> t = list.iterator();
225 if (t.hasNext() == false) {
226 throw new NoSuchAlgorithmException
227 (algorithm + " KeyPairGenerator not available");
228 }
229 // find a working Spi or KeyPairGenerator subclass
230 NoSuchAlgorithmException failure = null;
231 do {
232 Service s = t.next();
233 try {
234 Instance instance =
235 GetInstance.getInstance(s, KeyPairGeneratorSpi.class);
236 if (instance.impl instanceof KeyPairGenerator) {
237 return getInstance(instance, algorithm);
238 } else {
239 return new Delegate(instance, t, algorithm);
240 }
241 } catch (NoSuchAlgorithmException e) {
242 if (failure == null) {
243 failure = e;
244 }
245 }
246 } while (t.hasNext());
247 throw failure;
248 }
249
250 /**
251 * Returns a KeyPairGenerator object that generates public/private
252 * key pairs for the specified algorithm.
253 *
254 * <p> A new KeyPairGenerator object encapsulating the
255 * KeyPairGeneratorSpi implementation from the specified provider
256 * is returned. The specified provider must be registered
257 * in the security provider list.
258 *
259 * <p> Note that the list of registered providers may be retrieved via
260 * the {@link Security#getProviders() Security.getProviders()} method.
261 *
262 * @param algorithm the standard string name of the algorithm.
263 * See the KeyPairGenerator section in the <a href=
264 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
265 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
266 * for information about standard algorithm names.
267 *
268 * @param provider the string name of the provider.
269 *
270 * @return the new KeyPairGenerator object.
271 *
272 * @exception NoSuchAlgorithmException if a KeyPairGeneratorSpi
273 * implementation for the specified algorithm is not
274 * available from the specified provider.
275 *
276 * @exception NoSuchProviderException if the specified provider is not
277 * registered in the security provider list.
278 *
279 * @exception IllegalArgumentException if the provider name is null
280 * or empty.
281 *
282 * @see Provider
283 */
284 public static KeyPairGenerator getInstance(String algorithm,
285 String provider)
286 throws NoSuchAlgorithmException, NoSuchProviderException {
287 Instance instance = GetInstance.getInstance("KeyPairGenerator",
288 KeyPairGeneratorSpi.class, algorithm, provider);
289 return getInstance(instance, algorithm);
290 }
291
292 /**
293 * Returns a KeyPairGenerator object that generates public/private
294 * key pairs for the specified algorithm.
295 *
296 * <p> A new KeyPairGenerator object encapsulating the
297 * KeyPairGeneratorSpi implementation from the specified Provider
298 * object is returned. Note that the specified Provider object
299 * does not have to be registered in the provider list.
300 *
301 * @param algorithm the standard string name of the algorithm.
302 * See the KeyPairGenerator section in the <a href=
303 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
304 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
305 * for information about standard algorithm names.
306 *
307 * @param provider the provider.
308 *
309 * @return the new KeyPairGenerator object.
310 *
311 * @exception NoSuchAlgorithmException if a KeyPairGeneratorSpi
312 * implementation for the specified algorithm is not available
313 * from the specified Provider object.
314 *
315 * @exception IllegalArgumentException if the specified provider is null.
316 *
317 * @see Provider
318 *
319 * @since 1.4
320 */
321 public static KeyPairGenerator getInstance(String algorithm,
322 Provider provider) throws NoSuchAlgorithmException {
323 Instance instance = GetInstance.getInstance("KeyPairGenerator",
324 KeyPairGeneratorSpi.class, algorithm, provider);
325 return getInstance(instance, algorithm);
326 }
327
328 /**
329 * Returns the provider of this key pair generator object.
330 *
331 * @return the provider of this key pair generator object
332 */
333 public final Provider getProvider() {
334 disableFailover();
335 return this.provider;
336 }
337
338 void disableFailover() {
339 // empty, overridden in Delegate
340 }
341
342 /**
343 * Initializes the key pair generator for a certain keysize using
344 * a default parameter set and the {@code SecureRandom}
345 * implementation of the highest-priority installed provider as the source
346 * of randomness.
347 * (If none of the installed providers supply an implementation of
348 * {@code SecureRandom}, a system-provided source of randomness is
349 * used.)
350 *
351 * @param keysize the keysize. This is an
352 * algorithm-specific metric, such as modulus length, specified in
353 * number of bits.
354 *
355 * @exception InvalidParameterException if the {@code keysize} is not
356 * supported by this KeyPairGenerator object.
357 */
358 public void initialize(int keysize) {
359 initialize(keysize, JCAUtil.getSecureRandom());
360 }
361
362 /**
363 * Initializes the key pair generator for a certain keysize with
364 * the given source of randomness (and a default parameter set).
365 *
366 * @param keysize the keysize. This is an
367 * algorithm-specific metric, such as modulus length, specified in
368 * number of bits.
369 * @param random the source of randomness.
370 *
371 * @exception InvalidParameterException if the {@code keysize} is not
372 * supported by this KeyPairGenerator object.
373 *
374 * @since 1.2
375 */
376 public void initialize(int keysize, SecureRandom random) {
377 // This does nothing, because either
378 // 1. the implementation object returned by getInstance() is an
379 // instance of KeyPairGenerator which has its own
380 // initialize(keysize, random) method, so the application would
381 // be calling that method directly, or
382 // 2. the implementation returned by getInstance() is an instance
383 // of Delegate, in which case initialize(keysize, random) is
384 // overridden to call the corresponding SPI method.
385 // (This is a special case, because the API and SPI method have the
386 // same name.)
387 }
388
389 /**
390 * Initializes the key pair generator using the specified parameter
391 * set and the {@code SecureRandom}
392 * implementation of the highest-priority installed provider as the source
393 * of randomness.
394 * (If none of the installed providers supply an implementation of
395 * {@code SecureRandom}, a system-provided source of randomness is
396 * used.)
397 *
398 * <p>This concrete method has been added to this previously-defined
399 * abstract class.
400 * This method calls the KeyPairGeneratorSpi
401 * {@link KeyPairGeneratorSpi#initialize(
402 * java.security.spec.AlgorithmParameterSpec,
403 * java.security.SecureRandom) initialize} method,
404 * passing it {@code params} and a source of randomness (obtained
405 * from the highest-priority installed provider or system-provided if none
406 * of the installed providers supply one).
407 * That {@code initialize} method always throws an
408 * UnsupportedOperationException if it is not overridden by the provider.
409 *
410 * @param params the parameter set used to generate the keys.
411 *
412 * @exception InvalidAlgorithmParameterException if the given parameters
413 * are inappropriate for this key pair generator.
414 *
415 * @since 1.2
416 */
417 public void initialize(AlgorithmParameterSpec params)
418 throws InvalidAlgorithmParameterException {
419 initialize(params, JCAUtil.getSecureRandom());
420 }
421
422 /**
423 * Initializes the key pair generator with the given parameter
424 * set and source of randomness.
425 *
426 * <p>This concrete method has been added to this previously-defined
427 * abstract class.
428 * This method calls the KeyPairGeneratorSpi {@link
429 * KeyPairGeneratorSpi#initialize(
430 * java.security.spec.AlgorithmParameterSpec,
431 * java.security.SecureRandom) initialize} method,
432 * passing it {@code params} and {@code random}.
433 * That {@code initialize}
434 * method always throws an
435 * UnsupportedOperationException if it is not overridden by the provider.
436 *
437 * @param params the parameter set used to generate the keys.
438 * @param random the source of randomness.
439 *
440 * @exception InvalidAlgorithmParameterException if the given parameters
441 * are inappropriate for this key pair generator.
442 *
443 * @since 1.2
444 */
445 public void initialize(AlgorithmParameterSpec params,
446 SecureRandom random)
447 throws InvalidAlgorithmParameterException
448 {
449 // This does nothing, because either
450 // 1. the implementation object returned by getInstance() is an
451 // instance of KeyPairGenerator which has its own
452 // initialize(params, random) method, so the application would
453 // be calling that method directly, or
454 // 2. the implementation returned by getInstance() is an instance
455 // of Delegate, in which case initialize(params, random) is
456 // overridden to call the corresponding SPI method.
457 // (This is a special case, because the API and SPI method have the
458 // same name.)
459 }
460
461 /**
462 * Generates a key pair.
463 *
464 * <p>If this KeyPairGenerator has not been initialized explicitly,
465 * provider-specific defaults will be used for the size and other
466 * (algorithm-specific) values of the generated keys.
467 *
468 * <p>This will generate a new key pair every time it is called.
469 *
470 * <p>This method is functionally equivalent to
471 * {@link #generateKeyPair() generateKeyPair}.
472 *
473 * @return the generated key pair
474 *
475 * @since 1.2
476 */
477 public final KeyPair genKeyPair() {
478 return generateKeyPair();
479 }
480
481 /**
482 * Generates a key pair.
483 *
484 * <p>If this KeyPairGenerator has not been initialized explicitly,
485 * provider-specific defaults will be used for the size and other
486 * (algorithm-specific) values of the generated keys.
487 *
488 * <p>This will generate a new key pair every time it is called.
489 *
490 * <p>This method is functionally equivalent to
491 * {@link #genKeyPair() genKeyPair}.
492 *
493 * @return the generated key pair
494 */
495 public KeyPair generateKeyPair() {
496 // This does nothing (except returning null), because either:
497 //
498 // 1. the implementation object returned by getInstance() is an
499 // instance of KeyPairGenerator which has its own implementation
500 // of generateKeyPair (overriding this one), so the application
501 // would be calling that method directly, or
502 //
503 // 2. the implementation returned by getInstance() is an instance
504 // of Delegate, in which case generateKeyPair is
505 // overridden to invoke the corresponding SPI method.
506 //
507 // (This is a special case, because in JDK 1.1.x the generateKeyPair
508 // method was used both as an API and a SPI method.)
509 return null;
510 }
511
512
513 /*
514 * The following class allows providers to extend from KeyPairGeneratorSpi
515 * rather than from KeyPairGenerator. It represents a KeyPairGenerator
516 * with an encapsulated, provider-supplied SPI object (of type
517 * KeyPairGeneratorSpi).
518 * If the provider implementation is an instance of KeyPairGeneratorSpi,
519 * the getInstance() methods above return an instance of this class, with
520 * the SPI object encapsulated.
521 *
522 * Note: All SPI methods from the original KeyPairGenerator class have been
523 * moved up the hierarchy into a new class (KeyPairGeneratorSpi), which has
524 * been interposed in the hierarchy between the API (KeyPairGenerator)
525 * and its original parent (Object).
526 */
527
528 //
529 // error failover notes:
530 //
531 // . we failover if the implementation throws an error during init
532 // by retrying the init on other providers
533 //
534 // . we also failover if the init succeeded but the subsequent call
535 // to generateKeyPair() fails. In order for this to work, we need
536 // to remember the parameters to the last successful call to init
537 // and initialize() the next spi using them.
538 //
539 // . although not specified, KeyPairGenerators could be thread safe,
540 // so we make sure we do not interfere with that
541 //
542 // . failover is not available, if:
543 // . getInstance(algorithm, provider) was used
544 // . a provider extends KeyPairGenerator rather than
545 // KeyPairGeneratorSpi (JDK 1.1 style)
546 // . once getProvider() is called
547 //
548
549 private static final class Delegate extends KeyPairGenerator {
550
551 // The provider implementation (delegate)
552 private volatile KeyPairGeneratorSpi spi;
553
554 private final Object lock = new Object();
555
556 private Iterator<Service> serviceIterator;
557
558 private static final int I_NONE = 1;
559 private static final int I_SIZE = 2;
560 private static final int I_PARAMS = 3;
561
562 private int initType;
563 private int initKeySize;
564 private AlgorithmParameterSpec initParams;
565 private SecureRandom initRandom;
566
567 // constructor
568 Delegate(KeyPairGeneratorSpi spi, String algorithm) {
569 super(algorithm);
570 this.spi = spi;
571 }
572
573 Delegate(Instance instance, Iterator<Service> serviceIterator,
574 String algorithm) {
575 super(algorithm);
576 spi = (KeyPairGeneratorSpi)instance.impl;
577 provider = instance.provider;
578 this.serviceIterator = serviceIterator;
579 initType = I_NONE;
580
581 if (!skipDebug && pdebug != null) {
582 pdebug.println("KeyPairGenerator." + algorithm +
583 " algorithm from: " + provider.getName());
584 }
585 }
586
587 /**
588 * Update the active spi of this class and return the next
589 * implementation for failover. If no more implemenations are
590 * available, this method returns null. However, the active spi of
591 * this class is never set to null.
592 */
593 private KeyPairGeneratorSpi nextSpi(KeyPairGeneratorSpi oldSpi,
594 boolean reinit) {
595 synchronized (lock) {
596 // somebody else did a failover concurrently
597 // try that spi now
598 if ((oldSpi != null) && (oldSpi != spi)) {
599 return spi;
600 }
601 if (serviceIterator == null) {
602 return null;
603 }
604 while (serviceIterator.hasNext()) {
605 Service s = serviceIterator.next();
606 try {
607 Object inst = s.newInstance(null);
608 // ignore non-spis
609 if (inst instanceof KeyPairGeneratorSpi == false) {
610 continue;
611 }
612 if (inst instanceof KeyPairGenerator) {
613 continue;
614 }
615 KeyPairGeneratorSpi spi = (KeyPairGeneratorSpi)inst;
616 if (reinit) {
617 if (initType == I_SIZE) {
618 spi.initialize(initKeySize, initRandom);
619 } else if (initType == I_PARAMS) {
620 spi.initialize(initParams, initRandom);
621 } else if (initType != I_NONE) {
622 throw new AssertionError
623 ("KeyPairGenerator initType: " + initType);
624 }
625 }
626 provider = s.getProvider();
627 this.spi = spi;
628 return spi;
629 } catch (Exception e) {
630 // ignore
631 }
632 }
633 disableFailover();
634 return null;
635 }
636 }
637
638 void disableFailover() {
639 serviceIterator = null;
640 initType = 0;
641 initParams = null;
642 initRandom = null;
643 }
644
645 // engine method
646 public void initialize(int keysize, SecureRandom random) {
647 if (serviceIterator == null) {
648 spi.initialize(keysize, random);
649 return;
650 }
651 RuntimeException failure = null;
652 KeyPairGeneratorSpi mySpi = spi;
653 do {
654 try {
655 mySpi.initialize(keysize, random);
656 initType = I_SIZE;
657 initKeySize = keysize;
658 initParams = null;
659 initRandom = random;
660 return;
661 } catch (RuntimeException e) {
662 if (failure == null) {
663 failure = e;
664 }
665 mySpi = nextSpi(mySpi, false);
666 }
667 } while (mySpi != null);
668 throw failure;
669 }
670
671 // engine method
672 public void initialize(AlgorithmParameterSpec params,
673 SecureRandom random) throws InvalidAlgorithmParameterException {
674 if (serviceIterator == null) {
675 spi.initialize(params, random);
676 return;
677 }
678 Exception failure = null;
679 KeyPairGeneratorSpi mySpi = spi;
680 do {
681 try {
682 mySpi.initialize(params, random);
683 initType = I_PARAMS;
684 initKeySize = 0;
685 initParams = params;
686 initRandom = random;
687 return;
688 } catch (Exception e) {
689 if (failure == null) {
690 failure = e;
691 }
692 mySpi = nextSpi(mySpi, false);
693 }
694 } while (mySpi != null);
695 if (failure instanceof RuntimeException) {
696 throw (RuntimeException)failure;
697 }
698 // must be an InvalidAlgorithmParameterException
699 throw (InvalidAlgorithmParameterException)failure;
700 }
701
702 // engine method
703 public KeyPair generateKeyPair() {
704 if (serviceIterator == null) {
705 return spi.generateKeyPair();
706 }
707 RuntimeException failure = null;
708 KeyPairGeneratorSpi mySpi = spi;
709 do {
710 try {
711 return mySpi.generateKeyPair();
712 } catch (RuntimeException e) {
713 if (failure == null) {
714 failure = e;
715 }
716 mySpi = nextSpi(mySpi, true);
717 }
718 } while (mySpi != null);
719 throw failure;
720 }
721 }
722
723 }