Updates following review of SSL_stateless() code
[openssl.git] / test / drbgtest.c
1 /*
2  * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9
10 #include <string.h>
11 #include "internal/nelem.h"
12 #include <openssl/crypto.h>
13 #include <openssl/err.h>
14 #include <openssl/rand.h>
15 #include <openssl/obj_mac.h>
16 #include <openssl/evp.h>
17 #include <openssl/aes.h>
18 #include "../crypto/rand/rand_lcl.h"
19
20 #include "testutil.h"
21 #include "drbgtest.h"
22
23 typedef struct drbg_selftest_data_st {
24     int post;
25     int nid;
26     unsigned int flags;
27
28     /* KAT data for no PR */
29     const unsigned char *entropy;
30     size_t entropylen;
31     const unsigned char *nonce;
32     size_t noncelen;
33     const unsigned char *pers;
34     size_t perslen;
35     const unsigned char *adin;
36     size_t adinlen;
37     const unsigned char *entropyreseed;
38     size_t entropyreseedlen;
39     const unsigned char *adinreseed;
40     size_t adinreseedlen;
41     const unsigned char *adin2;
42     size_t adin2len;
43     const unsigned char *expected;
44     size_t exlen;
45     const unsigned char *kat2;
46     size_t kat2len;
47
48     /* KAT data for PR */
49     const unsigned char *entropy_pr;
50     size_t entropylen_pr;
51     const unsigned char *nonce_pr;
52     size_t noncelen_pr;
53     const unsigned char *pers_pr;
54     size_t perslen_pr;
55     const unsigned char *adin_pr;
56     size_t adinlen_pr;
57     const unsigned char *entropypr_pr;
58     size_t entropyprlen_pr;
59     const unsigned char *ading_pr;
60     size_t adinglen_pr;
61     const unsigned char *entropyg_pr;
62     size_t entropyglen_pr;
63     const unsigned char *kat_pr;
64     size_t katlen_pr;
65     const unsigned char *kat2_pr;
66     size_t kat2len_pr;
67 } DRBG_SELFTEST_DATA;
68
69 #define make_drbg_test_data(nid, flag, pr, post) {\
70     post, nid, flag, \
71     pr##_entropyinput, sizeof(pr##_entropyinput), \
72     pr##_nonce, sizeof(pr##_nonce), \
73     pr##_personalizationstring, sizeof(pr##_personalizationstring), \
74     pr##_additionalinput, sizeof(pr##_additionalinput), \
75     pr##_entropyinputreseed, sizeof(pr##_entropyinputreseed), \
76     pr##_additionalinputreseed, sizeof(pr##_additionalinputreseed), \
77     pr##_additionalinput2, sizeof(pr##_additionalinput2), \
78     pr##_int_returnedbits, sizeof(pr##_int_returnedbits), \
79     pr##_returnedbits, sizeof(pr##_returnedbits), \
80     pr##_pr_entropyinput, sizeof(pr##_pr_entropyinput), \
81     pr##_pr_nonce, sizeof(pr##_pr_nonce), \
82     pr##_pr_personalizationstring, sizeof(pr##_pr_personalizationstring), \
83     pr##_pr_additionalinput, sizeof(pr##_pr_additionalinput), \
84     pr##_pr_entropyinputpr, sizeof(pr##_pr_entropyinputpr), \
85     pr##_pr_additionalinput2, sizeof(pr##_pr_additionalinput2), \
86     pr##_pr_entropyinputpr2, sizeof(pr##_pr_entropyinputpr2), \
87     pr##_pr_int_returnedbits, sizeof(pr##_pr_int_returnedbits), \
88     pr##_pr_returnedbits, sizeof(pr##_pr_returnedbits) \
89     }
90
91 #define make_drbg_test_data_df(nid, pr, p) \
92     make_drbg_test_data(nid, RAND_DRBG_FLAG_CTR_USE_DF, pr, p)
93
94 static DRBG_SELFTEST_DATA drbg_test[] = {
95     make_drbg_test_data   (NID_aes_128_ctr, 0, aes_128_no_df, 0),
96     make_drbg_test_data   (NID_aes_192_ctr, 0, aes_192_no_df, 0),
97     make_drbg_test_data   (NID_aes_256_ctr, 0, aes_256_no_df, 1),
98     make_drbg_test_data_df(NID_aes_128_ctr,    aes_128_use_df, 0),
99     make_drbg_test_data_df(NID_aes_192_ctr,    aes_192_use_df, 0),
100     make_drbg_test_data_df(NID_aes_256_ctr,    aes_256_use_df, 1),
101 };
102
103 static int app_data_index;
104
105 /*
106  * Test context data, attached as EXDATA to the RAND_DRBG
107  */
108 typedef struct test_ctx_st {
109     const unsigned char *entropy;
110     size_t entropylen;
111     int entropycnt;
112     const unsigned char *nonce;
113     size_t noncelen;
114     int noncecnt;
115 } TEST_CTX;
116
117 static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
118                           int entropy, size_t min_len, size_t max_len)
119 {
120     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
121
122     t->entropycnt++;
123     *pout = (unsigned char *)t->entropy;
124     return t->entropylen;
125 }
126
127 static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout,
128                         int entropy, size_t min_len, size_t max_len)
129 {
130     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
131
132     t->noncecnt++;
133     *pout = (unsigned char *)t->nonce;
134     return t->noncelen;
135 }
136
137 static int uninstantiate(RAND_DRBG *drbg)
138 {
139     int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
140
141     ERR_clear_error();
142     return ret;
143 }
144
145 /*
146  * Do a single KAT test.  Return 0 on failure.
147  */
148 static int single_kat(DRBG_SELFTEST_DATA *td)
149 {
150     RAND_DRBG *drbg = NULL;
151     TEST_CTX t;
152     int failures = 0;
153     unsigned char buff[1024];
154
155     /*
156      * Test without PR: Instantiate DRBG with test entropy, nonce and
157      * personalisation string.
158      */
159     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
160         return 0;
161     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
162                                            kat_nonce, NULL))) {
163         failures++;
164         goto err;
165     }
166     memset(&t, 0, sizeof(t));
167     t.entropy = td->entropy;
168     t.entropylen = td->entropylen;
169     t.nonce = td->nonce;
170     t.noncelen = td->noncelen;
171     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
172
173     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))
174             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
175                                              td->adin, td->adinlen))
176             || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen))
177         failures++;
178
179     /* Reseed DRBG with test entropy and additional input */
180     t.entropy = td->entropyreseed;
181     t.entropylen = td->entropyreseedlen;
182     if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen)
183             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0,
184                                              td->adin2, td->adin2len))
185             || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len)))
186         failures++;
187     uninstantiate(drbg);
188
189     /*
190      * Now test with PR: Instantiate DRBG with test entropy, nonce and
191      * personalisation string.
192      */
193     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
194             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
195                                                   kat_nonce, NULL)))
196         failures++;
197     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
198     t.entropy = td->entropy_pr;
199     t.entropylen = td->entropylen_pr;
200     t.nonce = td->nonce_pr;
201     t.noncelen = td->noncelen_pr;
202     t.entropycnt = 0;
203     t.noncecnt = 0;
204     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr)))
205         failures++;
206
207     /*
208      * Now generate with PR: we need to supply entropy as this will
209      * perform a reseed operation.
210      */
211     t.entropy = td->entropypr_pr;
212     t.entropylen = td->entropyprlen_pr;
213     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1,
214                                       td->adin_pr, td->adinlen_pr))
215             || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr))
216         failures++;
217
218     /*
219      * Now generate again with PR: supply new entropy again.
220      */
221     t.entropy = td->entropyg_pr;
222     t.entropylen = td->entropyglen_pr;
223
224     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1,
225                                       td->ading_pr, td->adinglen_pr))
226                 || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr,
227                                 buff, td->kat2len_pr))
228         failures++;
229
230 err:
231     uninstantiate(drbg);
232     RAND_DRBG_free(drbg);
233     return failures == 0;
234 }
235
236 /*
237  * Initialise a DRBG based on selftest data
238  */
239 static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t)
240 {
241     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
242             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
243                                                   kat_nonce, NULL)))
244         return 0;
245     RAND_DRBG_set_ex_data(drbg, app_data_index, t);
246     t->entropy = td->entropy;
247     t->entropylen = td->entropylen;
248     t->nonce = td->nonce;
249     t->noncelen = td->noncelen;
250     t->entropycnt = 0;
251     t->noncecnt = 0;
252     return 1;
253 }
254
255 /*
256  * Initialise and instantiate DRBG based on selftest data
257  */
258 static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td,
259                        TEST_CTX *t)
260 {
261     if (!TEST_true(init(drbg, td, t))
262             || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)))
263         return 0;
264     return 1;
265 }
266
267 /*
268  * Perform extensive error checking as required by SP800-90.
269  * Induce several failure modes and check an error condition is set.
270  */
271 static int error_check(DRBG_SELFTEST_DATA *td)
272 {
273     static char zero[sizeof(RAND_DRBG)];
274     RAND_DRBG *drbg = NULL;
275     TEST_CTX t;
276     unsigned char buff[1024];
277     unsigned int generate_counter_tmp;
278     int ret = 0;
279
280     if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)))
281         goto err;
282
283     /*
284      * Personalisation string tests
285      */
286
287     /* Test detection of too large personlisation string */
288     if (!init(drbg, td, &t)
289             || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0)
290         goto err;
291
292     /*
293      * Entropy source tests
294      */
295
296     /* Test entropy source failure detecion: i.e. returns no data */
297     t.entropylen = 0;
298     if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0))
299         goto err;
300
301     /* Try to generate output from uninstantiated DRBG */
302     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
303                                        td->adin, td->adinlen))
304             || !uninstantiate(drbg))
305         goto err;
306
307     /* Test insufficient entropy */
308     t.entropylen = drbg->min_entropylen - 1;
309     if (!init(drbg, td, &t)
310             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
311             || !uninstantiate(drbg))
312         goto err;
313
314     /* Test too much entropy */
315     t.entropylen = drbg->max_entropylen + 1;
316     if (!init(drbg, td, &t)
317             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
318             || !uninstantiate(drbg))
319         goto err;
320
321     /*
322      * Nonce tests
323      */
324
325     /* Test too small nonce */
326     if (drbg->min_noncelen) {
327         t.noncelen = drbg->min_noncelen - 1;
328         if (!init(drbg, td, &t)
329                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
330                 || !uninstantiate(drbg))
331             goto err;
332     }
333
334     /* Test too large nonce */
335     if (drbg->max_noncelen) {
336         t.noncelen = drbg->max_noncelen + 1;
337         if (!init(drbg, td, &t)
338                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
339                 || !uninstantiate(drbg))
340             goto err;
341     }
342
343     /* Instantiate with valid data, Check generation is now OK */
344     if (!instantiate(drbg, td, &t)
345             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
346                                              td->adin, td->adinlen)))
347         goto err;
348
349     /* Request too much data for one request */
350     if (!TEST_false(RAND_DRBG_generate(drbg, buff, drbg->max_request + 1, 0,
351                                        td->adin, td->adinlen)))
352         goto err;
353
354     /* Try too large additional input */
355     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
356                                        td->adin, drbg->max_adinlen + 1)))
357         goto err;
358
359     /*
360      * Check prediction resistance request fails if entropy source
361      * failure.
362      */
363     t.entropylen = 0;
364     if (TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
365                                       td->adin, td->adinlen))
366             || !uninstantiate(drbg))
367         goto err;
368
369     /* Instantiate again with valid data */
370     if (!instantiate(drbg, td, &t))
371         goto err;
372     generate_counter_tmp = drbg->generate_counter;
373     drbg->generate_counter = drbg->reseed_interval;
374
375     /* Generate output and check entropy has been requested for reseed */
376     t.entropycnt = 0;
377     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
378                                       td->adin, td->adinlen))
379             || !TEST_int_eq(t.entropycnt, 1)
380             || !TEST_int_eq(drbg->generate_counter, generate_counter_tmp + 1)
381             || !uninstantiate(drbg))
382         goto err;
383
384     /*
385      * Check prediction resistance request fails if entropy source
386      * failure.
387      */
388     t.entropylen = 0;
389     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
390                                        td->adin, td->adinlen))
391             || !uninstantiate(drbg))
392         goto err;
393
394     /* Test reseed counter works */
395     if (!instantiate(drbg, td, &t))
396         goto err;
397     generate_counter_tmp = drbg->generate_counter;
398     drbg->generate_counter = drbg->reseed_interval;
399
400     /* Generate output and check entropy has been requested for reseed */
401     t.entropycnt = 0;
402     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
403                                       td->adin, td->adinlen))
404             || !TEST_int_eq(t.entropycnt, 1)
405             || !TEST_int_eq(drbg->generate_counter, generate_counter_tmp + 1)
406             || !uninstantiate(drbg))
407         goto err;
408
409     /*
410      * Explicit reseed tests
411      */
412
413     /* Test explicit reseed with too large additional input */
414     if (!init(drbg, td, &t)
415             || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1) > 0)
416         goto err;
417
418     /* Test explicit reseed with entropy source failure */
419     t.entropylen = 0;
420     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
421             || !uninstantiate(drbg))
422         goto err;
423
424     /* Test explicit reseed with too much entropy */
425     if (!init(drbg, td, &t))
426         goto err;
427     t.entropylen = drbg->max_entropylen + 1;
428     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
429             || !uninstantiate(drbg))
430         goto err;
431
432     /* Test explicit reseed with too little entropy */
433     if (!init(drbg, td, &t))
434         goto err;
435     t.entropylen = drbg->min_entropylen - 1;
436     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
437             || !uninstantiate(drbg))
438         goto err;
439
440     /* Standard says we have to check uninstantiate really zeroes */
441     if (!TEST_mem_eq(zero, sizeof(drbg->data), &drbg->data, sizeof(drbg->data)))
442         goto err;
443
444     ret = 1;
445
446 err:
447     uninstantiate(drbg);
448     RAND_DRBG_free(drbg);
449     return ret;
450 }
451
452 static int test_kats(int i)
453 {
454     DRBG_SELFTEST_DATA *td = &drbg_test[i];
455     int rv = 0;
456
457     if (!single_kat(td))
458         goto err;
459     rv = 1;
460
461 err:
462     return rv;
463 }
464
465 static int test_error_checks(int i)
466 {
467     DRBG_SELFTEST_DATA *td = &drbg_test[i];
468     int rv = 0;
469
470     if (error_check(td))
471         goto err;
472     rv = 1;
473
474 err:
475     return rv;
476 }
477
478 /*
479  * Hook context data, attached as EXDATA to the RAND_DRBG
480  */
481 typedef struct hook_ctx_st {
482     RAND_DRBG *drbg;
483     /*
484      * Currently, all DRBGs use the same get_entropy() callback.
485      * The tests however, don't assume this and store
486      * the original callback for every DRBG separately.
487      */
488     RAND_DRBG_get_entropy_fn get_entropy;
489     /* forces a failure of the get_entropy() call if nonzero */
490     int fail;
491     /* counts successful reseeds */
492     int reseed_count;
493 } HOOK_CTX;
494
495 static HOOK_CTX master_ctx, public_ctx, private_ctx;
496
497 static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
498 {
499     return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
500 }
501
502 /* Intercepts and counts calls to the get_entropy() callback */
503 static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout,
504                           int entropy, size_t min_len, size_t max_len)
505 {
506     size_t ret;
507     HOOK_CTX *ctx = get_hook_ctx(drbg);
508
509     if (ctx->fail != 0)
510         return 0;
511
512     ret = ctx->get_entropy(
513         drbg, pout, entropy, min_len, max_len);
514
515     if (ret != 0)
516         ctx->reseed_count++;
517     return ret;
518 }
519
520 /* Installs a hook for the get_entropy() callback of the given drbg */
521 static void hook_drbg(RAND_DRBG *drbg, HOOK_CTX *ctx)
522 {
523     memset(ctx, 0, sizeof(*ctx));
524     ctx->drbg = drbg;
525     ctx->get_entropy = drbg->get_entropy;
526     drbg->get_entropy = get_entropy_hook;
527     RAND_DRBG_set_ex_data(drbg, app_data_index, ctx);
528 }
529
530 /* Installs the hook for the get_entropy() callback of the given drbg */
531 static void unhook_drbg(RAND_DRBG *drbg)
532 {
533     HOOK_CTX *ctx = get_hook_ctx(drbg);
534
535     drbg->get_entropy = ctx->get_entropy;
536     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data);
537 }
538
539 /* Resets the given hook context */
540 static void reset_hook_ctx(HOOK_CTX *ctx)
541 {
542     ctx->fail = 0;
543     ctx->reseed_count = 0;
544 }
545
546 /* Resets all drbg hook contexts */
547 static void reset_drbg_hook_ctx()
548 {
549     reset_hook_ctx(&master_ctx);
550     reset_hook_ctx(&public_ctx);
551     reset_hook_ctx(&private_ctx);
552 }
553
554 /*
555  * Generates random output using RAND_bytes() and RAND_priv_bytes()
556  * and checks whether the three shared DRBGs were reseeded as
557  * expected.
558  *
559  * |expect_success|: expected outcome (as reported by RAND_status())
560  * |master|, |public|, |private|: pointers to the three shared DRBGs
561  * |expect_xxx_reseed| =
562  *       1:  it is expected that the specified DRBG is reseeded
563  *       0:  it is expected that the specified DRBG is not reseeded
564  *      -1:  don't check whether the specified DRBG was reseeded or not
565  */
566 static int test_drbg_reseed(int expect_success,
567                             RAND_DRBG *master,
568                             RAND_DRBG *public,
569                             RAND_DRBG *private,
570                             int expect_master_reseed,
571                             int expect_public_reseed,
572                             int expect_private_reseed
573                            )
574 {
575     unsigned char buf[32];
576     time_t before_reseed, after_reseed;
577     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
578
579     /*
580      * step 1: check preconditions
581      */
582
583     /* Test whether seed propagation is enabled */
584     if (!TEST_int_ne(master->reseed_counter, 0)
585         || !TEST_int_ne(public->reseed_counter, 0)
586         || !TEST_int_ne(private->reseed_counter, 0))
587         return 0;
588
589     /* Check whether the master DRBG's reseed counter is the largest one */
590     if (!TEST_int_le(public->reseed_counter, master->reseed_counter)
591         || !TEST_int_le(private->reseed_counter, master->reseed_counter))
592         return 0;
593
594     /*
595      * step 2: generate random output
596      */
597
598     /* Generate random output from the public and private DRBG */
599     before_reseed = expect_master_reseed == 1 ? time(NULL) : 0;
600     if (!TEST_int_eq(RAND_bytes(buf, sizeof(buf)), expect_success)
601         || !TEST_int_eq(RAND_priv_bytes(buf, sizeof(buf)), expect_success))
602         return 0;
603     after_reseed = time(NULL);
604
605
606     /*
607      * step 3: check postconditions
608      */
609
610     /* Test whether reseeding succeeded as expected */
611     if (!TEST_int_eq(master->state, expected_state)
612         || !TEST_int_eq(public->state, expected_state)
613         || !TEST_int_eq(private->state, expected_state))
614         return 0;
615
616     if (expect_master_reseed >= 0) {
617         /* Test whether master DRBG was reseeded as expected */
618         if (!TEST_int_eq(master_ctx.reseed_count, expect_master_reseed))
619             return 0;
620     }
621
622     if (expect_public_reseed >= 0) {
623         /* Test whether public DRBG was reseeded as expected */
624         if (!TEST_int_eq(public_ctx.reseed_count, expect_public_reseed))
625             return 0;
626     }
627
628     if (expect_private_reseed >= 0) {
629         /* Test whether public DRBG was reseeded as expected */
630         if (!TEST_int_eq(private_ctx.reseed_count, expect_private_reseed))
631             return 0;
632     }
633
634     if (expect_success == 1) {
635         /* Test whether all three reseed counters are synchronized */
636         if (!TEST_int_eq(public->reseed_counter, master->reseed_counter)
637             || !TEST_int_eq(private->reseed_counter, master->reseed_counter))
638             return 0;
639
640         /* Test whether reseed time of master DRBG is set correctly */
641         if (!TEST_time_t_le(before_reseed, master->reseed_time)
642             || !TEST_time_t_le(master->reseed_time, after_reseed))
643             return 0;
644
645         /* Test whether reseed times of child DRBGs are synchronized with master */
646         if (!TEST_time_t_ge(public->reseed_time, master->reseed_time)
647             || !TEST_time_t_ge(private->reseed_time, master->reseed_time))
648             return 0;
649     } else {
650         ERR_clear_error();
651     }
652
653     return 1;
654 }
655
656 /*
657  * Test whether the default rand_method (RAND_OpenSSL()) is
658  * setup correctly, in particular whether reseeding  works
659  * as designed.
660  */
661 static int test_rand_reseed(void)
662 {
663     RAND_DRBG *master, *public, *private;
664     unsigned char rand_add_buf[256];
665     int rv=0;
666
667     /* Check whether RAND_OpenSSL() is the default method */
668     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
669         return 0;
670
671     /* All three DRBGs should be non-null */
672     if (!TEST_ptr(master = RAND_DRBG_get0_master())
673         || !TEST_ptr(public = RAND_DRBG_get0_public())
674         || !TEST_ptr(private = RAND_DRBG_get0_private()))
675         return 0;
676
677     /* There should be three distinct DRBGs, two of them chained to master */
678     if (!TEST_ptr_ne(public, private)
679         || !TEST_ptr_ne(public, master)
680         || !TEST_ptr_ne(private, master)
681         || !TEST_ptr_eq(public->parent, master)
682         || !TEST_ptr_eq(private->parent, master))
683         return 0;
684
685     /* Install hooks for the following tests */
686     hook_drbg(master,  &master_ctx);
687     hook_drbg(public,  &public_ctx);
688     hook_drbg(private, &private_ctx);
689
690     /*
691      * Test initial state of shared DRBs
692      */
693     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 0)))
694         goto error;
695     reset_drbg_hook_ctx();
696
697     /*
698      * Test whether the public and private DRBG are both reseeded when their
699      * reseed counters differ from the master's reseed counter.
700      */
701     master->reseed_counter++;
702     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 1)))
703         goto error;
704     reset_drbg_hook_ctx();
705
706     /*
707      * Test whether the public DRBG is reseeded when its reseed counter differs
708      * from the master's reseed counter.
709      */
710     master->reseed_counter++;
711     private->reseed_counter++;
712     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 0)))
713         goto error;
714     reset_drbg_hook_ctx();
715
716     /*
717      * Test whether the private DRBG is reseeded when its reseed counter differs
718      * from the master's reseed counter.
719      */
720     master->reseed_counter++;
721     public->reseed_counter++;
722     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 1)))
723         goto error;
724     reset_drbg_hook_ctx();
725
726
727     /* fill 'randomness' buffer with some arbitrary data */
728     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
729
730     /*
731      * Test whether all three DRBGs are reseeded by RAND_add()
732      */
733     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
734     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1)))
735         goto error;
736     reset_drbg_hook_ctx();
737
738
739     /*
740      * Test whether none of the DRBGs is reseed if the master fails to reseed
741      */
742     master_ctx.fail = 1;
743     master->reseed_counter++;
744     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
745     if (!TEST_true(test_drbg_reseed(0, master, public, private, 0, 0, 0)))
746         goto error;
747     reset_drbg_hook_ctx();
748
749     rv = 1;
750
751 error:
752     /* Remove hooks  */
753     unhook_drbg(master);
754     unhook_drbg(public);
755     unhook_drbg(private);
756
757     return rv;
758 }
759
760
761 int setup_tests(void)
762 {
763     app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
764
765     ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test));
766     ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test));
767     ADD_TEST(test_rand_reseed);
768     return 1;
769 }