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
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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 * three 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} property to determine
201 * the preferred provider order for the specified algorithm. This
202 * may be different than the order of providers returned by
203 * {@link Security#getProviders() Security.getProviders()}.
204 *
205 * @param algorithm the standard string name of the algorithm.
206 * See the KeyPairGenerator section in the <a href=
207 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
208 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
209 * for information about standard algorithm names.
210 *
211 * @return the new KeyPairGenerator object.
212 *
213 * @exception NoSuchAlgorithmException if no Provider supports a
214 * KeyPairGeneratorSpi implementation for the
215 * specified algorithm.
216 *
217 * @see Provider
218 */
219 public static KeyPairGenerator getInstance(String algorithm)
220 throws NoSuchAlgorithmException {
221 List<Service> list =
222 GetInstance.getServices("KeyPairGenerator", algorithm);
223 Iterator<Service> t = list.iterator();
224 if (t.hasNext() == false) {
225 throw new NoSuchAlgorithmException
226 (algorithm + " KeyPairGenerator not available");
227 }
228 // find a working Spi or KeyPairGenerator subclass
229 NoSuchAlgorithmException failure = null;
230 do {
231 Service s = t.next();
232 try {
233 Instance instance =
234 GetInstance.getInstance(s, KeyPairGeneratorSpi.class);
235 if (instance.impl instanceof KeyPairGenerator) {
236 return getInstance(instance, algorithm);
237 } else {
238 return new Delegate(instance, t, algorithm);
239 }
240 } catch (NoSuchAlgorithmException e) {
241 if (failure == null) {
242 failure = e;
243 }
244 }
245 } while (t.hasNext());
246 throw failure;
247 }
248
249 /**
250 * Returns a KeyPairGenerator object that generates public/private
251 * key pairs for the specified algorithm.
252 *
253 * <p> A new KeyPairGenerator object encapsulating the
254 * KeyPairGeneratorSpi implementation from the specified provider
255 * is returned. The specified provider must be registered
256 * in the security provider list.
257 *
258 * <p> Note that the list of registered providers may be retrieved via
259 * the {@link Security#getProviders() Security.getProviders()} method.
260 *
261 * @param algorithm the standard string name of the algorithm.
262 * See the KeyPairGenerator section in the <a href=
263 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
264 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
265 * for information about standard algorithm names.
266 *
267 * @param provider the string name of the provider.
268 *
269 * @return the new KeyPairGenerator object.
270 *
271 * @exception NoSuchAlgorithmException if a KeyPairGeneratorSpi
272 * implementation for the specified algorithm is not
273 * available from the specified provider.
274 *
275 * @exception NoSuchProviderException if the specified provider is not
276 * registered in the security provider list.
277 *
278 * @exception IllegalArgumentException if the provider name is null
279 * or empty.
280 *
281 * @see Provider
282 */
283 public static KeyPairGenerator getInstance(String algorithm,
284 String provider)
285 throws NoSuchAlgorithmException, NoSuchProviderException {
286 Instance instance = GetInstance.getInstance("KeyPairGenerator",
287 KeyPairGeneratorSpi.class, algorithm, provider);
288 return getInstance(instance, algorithm);
289 }
290
291 /**
292 * Returns a KeyPairGenerator object that generates public/private
293 * key pairs for the specified algorithm.
294 *
295 * <p> A new KeyPairGenerator object encapsulating the
296 * KeyPairGeneratorSpi implementation from the specified Provider
297 * object is returned. Note that the specified Provider object
298 * does not have to be registered in the provider list.
299 *
300 * @param algorithm the standard string name of the algorithm.
301 * See the KeyPairGenerator section in the <a href=
302 * "{@docRoot}/../technotes/guides/security/StandardNames.html#KeyPairGenerator">
303 * Java Cryptography Architecture Standard Algorithm Name Documentation</a>
304 * for information about standard algorithm names.
305 *
306 * @param provider the provider.
307 *
308 * @return the new KeyPairGenerator object.
309 *
310 * @exception NoSuchAlgorithmException if a KeyPairGeneratorSpi
311 * implementation for the specified algorithm is not available
312 * from the specified Provider object.
313 *
314 * @exception IllegalArgumentException if the specified provider is null.
315 *
316 * @see Provider
317 *
318 * @since 1.4
319 */
320 public static KeyPairGenerator getInstance(String algorithm,
321 Provider provider) throws NoSuchAlgorithmException {
322 Instance instance = GetInstance.getInstance("KeyPairGenerator",
323 KeyPairGeneratorSpi.class, algorithm, provider);
324 return getInstance(instance, algorithm);
325 }
326
327 /**
328 * Returns the provider of this key pair generator object.
329 *
330 * @return the provider of this key pair generator object
331 */
332 public final Provider getProvider() {
333 disableFailover();
334 return this.provider;
335 }
336
337 void disableFailover() {
338 // empty, overridden in Delegate
339 }
340
341 /**
342 * Initializes the key pair generator for a certain keysize using
343 * a default parameter set and the {@code SecureRandom}
344 * implementation of the highest-priority installed provider as the source
345 * of randomness.
346 * (If none of the installed providers supply an implementation of
347 * {@code SecureRandom}, a system-provided source of randomness is
348 * used.)
349 *
350 * @param keysize the keysize. This is an
351 * algorithm-specific metric, such as modulus length, specified in
352 * number of bits.
353 *
354 * @exception InvalidParameterException if the {@code keysize} is not
355 * supported by this KeyPairGenerator object.
356 */
357 public void initialize(int keysize) {
358 initialize(keysize, JCAUtil.getSecureRandom());
359 }
360
361 /**
362 * Initializes the key pair generator for a certain keysize with
363 * the given source of randomness (and a default parameter set).
364 *
365 * @param keysize the keysize. This is an
366 * algorithm-specific metric, such as modulus length, specified in
367 * number of bits.
368 * @param random the source of randomness.
369 *
370 * @exception InvalidParameterException if the {@code keysize} is not
371 * supported by this KeyPairGenerator object.
372 *
373 * @since 1.2
374 */
375 public void initialize(int keysize, SecureRandom random) {
376 // This does nothing, because either
377 // 1. the implementation object returned by getInstance() is an
378 // instance of KeyPairGenerator which has its own
379 // initialize(keysize, random) method, so the application would
380 // be calling that method directly, or
381 // 2. the implementation returned by getInstance() is an instance
382 // of Delegate, in which case initialize(keysize, random) is
383 // overridden to call the corresponding SPI method.
384 // (This is a special case, because the API and SPI method have the
385 // same name.)
386 }
387
388 /**
389 * Initializes the key pair generator using the specified parameter
390 * set and the {@code SecureRandom}
391 * implementation of the highest-priority installed provider as the source
392 * of randomness.
393 * (If none of the installed providers supply an implementation of
394 * {@code SecureRandom}, a system-provided source of randomness is
395 * used.).
396 *
397 * <p>This concrete method has been added to this previously-defined
398 * abstract class.
399 * This method calls the KeyPairGeneratorSpi
400 * {@link KeyPairGeneratorSpi#initialize(
401 * java.security.spec.AlgorithmParameterSpec,
402 * java.security.SecureRandom) initialize} method,
403 * passing it {@code params} and a source of randomness (obtained
404 * from the highest-priority installed provider or system-provided if none
405 * of the installed providers supply one).
406 * That {@code initialize} method always throws an
407 * UnsupportedOperationException if it is not overridden by the provider.
408 *
409 * @param params the parameter set used to generate the keys.
410 *
411 * @exception InvalidAlgorithmParameterException if the given parameters
412 * are inappropriate for this key pair generator.
413 *
414 * @since 1.2
415 */
416 public void initialize(AlgorithmParameterSpec params)
417 throws InvalidAlgorithmParameterException {
418 initialize(params, JCAUtil.getSecureRandom());
419 }
420
421 /**
422 * Initializes the key pair generator with the given parameter
423 * set and source of randomness.
424 *
425 * <p>This concrete method has been added to this previously-defined
426 * abstract class.
427 * This method calls the KeyPairGeneratorSpi {@link
428 * KeyPairGeneratorSpi#initialize(
429 * java.security.spec.AlgorithmParameterSpec,
430 * java.security.SecureRandom) initialize} method,
431 * passing it {@code params} and {@code random}.
432 * That {@code initialize}
433 * method always throws an
434 * UnsupportedOperationException if it is not overridden by the provider.
435 *
436 * @param params the parameter set used to generate the keys.
437 * @param random the source of randomness.
438 *
439 * @exception InvalidAlgorithmParameterException if the given parameters
440 * are inappropriate for this key pair generator.
441 *
442 * @since 1.2
443 */
444 public void initialize(AlgorithmParameterSpec params,
445 SecureRandom random)
446 throws InvalidAlgorithmParameterException
447 {
448 // This does nothing, because either
449 // 1. the implementation object returned by getInstance() is an
450 // instance of KeyPairGenerator which has its own
451 // initialize(params, random) method, so the application would
452 // be calling that method directly, or
453 // 2. the implementation returned by getInstance() is an instance
454 // of Delegate, in which case initialize(params, random) is
455 // overridden to call the corresponding SPI method.
456 // (This is a special case, because the API and SPI method have the
457 // same name.)
458 }
459
460 /**
461 * Generates a key pair.
462 *
463 * <p>If this KeyPairGenerator has not been initialized explicitly,
464 * provider-specific defaults will be used for the size and other
465 * (algorithm-specific) values of the generated keys.
466 *
467 * <p>This will generate a new key pair every time it is called.
468 *
469 * <p>This method is functionally equivalent to
470 * {@link #generateKeyPair() generateKeyPair}.
471 *
472 * @return the generated key pair
473 *
474 * @since 1.2
475 */
476 public final KeyPair genKeyPair() {
477 return generateKeyPair();
478 }
479
480 /**
481 * Generates a key pair.
482 *
483 * <p>If this KeyPairGenerator has not been initialized explicitly,
484 * provider-specific defaults will be used for the size and other
485 * (algorithm-specific) values of the generated keys.
486 *
487 * <p>This will generate a new key pair every time it is called.
488 *
489 * <p>This method is functionally equivalent to
490 * {@link #genKeyPair() genKeyPair}.
491 *
492 * @return the generated key pair
493 */
494 public KeyPair generateKeyPair() {
495 // This does nothing (except returning null), because either:
496 //
497 // 1. the implementation object returned by getInstance() is an
498 // instance of KeyPairGenerator which has its own implementation
499 // of generateKeyPair (overriding this one), so the application
500 // would be calling that method directly, or
501 //
502 // 2. the implementation returned by getInstance() is an instance
503 // of Delegate, in which case generateKeyPair is
504 // overridden to invoke the corresponding SPI method.
505 //
506 // (This is a special case, because in JDK 1.1.x the generateKeyPair
507 // method was used both as an API and a SPI method.)
508 return null;
509 }
510
511
512 /*
513 * The following class allows providers to extend from KeyPairGeneratorSpi
514 * rather than from KeyPairGenerator. It represents a KeyPairGenerator
515 * with an encapsulated, provider-supplied SPI object (of type
516 * KeyPairGeneratorSpi).
517 * If the provider implementation is an instance of KeyPairGeneratorSpi,
518 * the getInstance() methods above return an instance of this class, with
519 * the SPI object encapsulated.
520 *
521 * Note: All SPI methods from the original KeyPairGenerator class have been
522 * moved up the hierarchy into a new class (KeyPairGeneratorSpi), which has
523 * been interposed in the hierarchy between the API (KeyPairGenerator)
524 * and its original parent (Object).
525 */
526
527 //
528 // error failover notes:
529 //
530 // . we failover if the implementation throws an error during init
531 // by retrying the init on other providers
532 //
533 // . we also failover if the init succeeded but the subsequent call
534 // to generateKeyPair() fails. In order for this to work, we need
535 // to remember the parameters to the last successful call to init
536 // and initialize() the next spi using them.
537 //
538 // . although not specified, KeyPairGenerators could be thread safe,
539 // so we make sure we do not interfere with that
540 //
541 // . failover is not available, if:
542 // . getInstance(algorithm, provider) was used
543 // . a provider extends KeyPairGenerator rather than
544 // KeyPairGeneratorSpi (JDK 1.1 style)
545 // . once getProvider() is called
546 //
547
548 private static final class Delegate extends KeyPairGenerator {
549
550 // The provider implementation (delegate)
551 private volatile KeyPairGeneratorSpi spi;
552
553 private final Object lock = new Object();
554
555 private Iterator<Service> serviceIterator;
556
557 private static final int I_NONE = 1;
558 private static final int I_SIZE = 2;
559 private static final int I_PARAMS = 3;
560
561 private int initType;
562 private int initKeySize;
563 private AlgorithmParameterSpec initParams;
564 private SecureRandom initRandom;
565
566 // constructor
567 Delegate(KeyPairGeneratorSpi spi, String algorithm) {
568 super(algorithm);
569 this.spi = spi;
570 }
571
572 Delegate(Instance instance, Iterator<Service> serviceIterator,
573 String algorithm) {
574 super(algorithm);
575 spi = (KeyPairGeneratorSpi)instance.impl;
576 provider = instance.provider;
577 this.serviceIterator = serviceIterator;
578 initType = I_NONE;
579
580 if (!skipDebug && pdebug != null) {
581 pdebug.println("KeyPairGenerator." + algorithm +
582 " algorithm from: " + provider.getName());
583 }
584 }
585
586 /**
587 * Update the active spi of this class and return the next
588 * implementation for failover. If no more implemenations are
589 * available, this method returns null. However, the active spi of
590 * this class is never set to null.
591 */
592 private KeyPairGeneratorSpi nextSpi(KeyPairGeneratorSpi oldSpi,
593 boolean reinit) {
594 synchronized (lock) {
595 // somebody else did a failover concurrently
596 // try that spi now
597 if ((oldSpi != null) && (oldSpi != spi)) {
598 return spi;
599 }
600 if (serviceIterator == null) {
601 return null;
602 }
603 while (serviceIterator.hasNext()) {
604 Service s = serviceIterator.next();
605 try {
606 Object inst = s.newInstance(null);
607 // ignore non-spis
608 if (inst instanceof KeyPairGeneratorSpi == false) {
609 continue;
610 }
611 if (inst instanceof KeyPairGenerator) {
612 continue;
613 }
614 KeyPairGeneratorSpi spi = (KeyPairGeneratorSpi)inst;
615 if (reinit) {
616 if (initType == I_SIZE) {
617 spi.initialize(initKeySize, initRandom);
618 } else if (initType == I_PARAMS) {
619 spi.initialize(initParams, initRandom);
620 } else if (initType != I_NONE) {
621 throw new AssertionError
622 ("KeyPairGenerator initType: " + initType);
623 }
624 }
625 provider = s.getProvider();
626 this.spi = spi;
627 return spi;
628 } catch (Exception e) {
629 // ignore
630 }
631 }
632 disableFailover();
633 return null;
634 }
635 }
636
637 void disableFailover() {
638 serviceIterator = null;
639 initType = 0;
640 initParams = null;
641 initRandom = null;
642 }
643
644 // engine method
645 public void initialize(int keysize, SecureRandom random) {
646 if (serviceIterator == null) {
647 spi.initialize(keysize, random);
648 return;
649 }
650 RuntimeException failure = null;
651 KeyPairGeneratorSpi mySpi = spi;
652 do {
653 try {
654 mySpi.initialize(keysize, random);
655 initType = I_SIZE;
656 initKeySize = keysize;
657 initParams = null;
658 initRandom = random;
659 return;
660 } catch (RuntimeException e) {
661 if (failure == null) {
662 failure = e;
663 }
664 mySpi = nextSpi(mySpi, false);
665 }
666 } while (mySpi != null);
667 throw failure;
668 }
669
670 // engine method
671 public void initialize(AlgorithmParameterSpec params,
672 SecureRandom random) throws InvalidAlgorithmParameterException {
673 if (serviceIterator == null) {
674 spi.initialize(params, random);
675 return;
676 }
677 Exception failure = null;
678 KeyPairGeneratorSpi mySpi = spi;
679 do {
680 try {
681 mySpi.initialize(params, random);
682 initType = I_PARAMS;
683 initKeySize = 0;
684 initParams = params;
685 initRandom = random;
686 return;
687 } catch (Exception e) {
688 if (failure == null) {
689 failure = e;
690 }
691 mySpi = nextSpi(mySpi, false);
692 }
693 } while (mySpi != null);
694 if (failure instanceof RuntimeException) {
695 throw (RuntimeException)failure;
696 }
697 // must be an InvalidAlgorithmParameterException
698 throw (InvalidAlgorithmParameterException)failure;
699 }
700
701 // engine method
702 public KeyPair generateKeyPair() {
703 if (serviceIterator == null) {
704 return spi.generateKeyPair();
705 }
706 RuntimeException failure = null;
707 KeyPairGeneratorSpi mySpi = spi;
708 do {
709 try {
710 return mySpi.generateKeyPair();
711 } catch (RuntimeException e) {
712 if (failure == null) {
713 failure = e;
714 }
715 mySpi = nextSpi(mySpi, true);
716 }
717 } while (mySpi != null);
718 throw failure;
719 }
720 }
721
722 }