test/drbgtest.c

   1 /*
   2  * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include "../crypto/include/internal/rand_int.h"
  20
  21 #if defined(_WIN32)
  22 # include <windows.h>
  23 #endif
  24
  25 #include "testutil.h"
  26 #include "drbgtest.h"
  27
  28 typedef struct drbg_selftest_data_st {
  29     int post;
  30     int nid;
  31     unsigned int flags;
  32
  33     /* KAT data for no PR */
  34     const unsigned char *entropy;
  35     size_t entropylen;
  36     const unsigned char *nonce;
  37     size_t noncelen;
  38     const unsigned char *pers;
  39     size_t perslen;
  40     const unsigned char *adin;
  41     size_t adinlen;
  42     const unsigned char *entropyreseed;
  43     size_t entropyreseedlen;
  44     const unsigned char *adinreseed;
  45     size_t adinreseedlen;
  46     const unsigned char *adin2;
  47     size_t adin2len;
  48     const unsigned char *expected;
  49     size_t exlen;
  50     const unsigned char *kat2;
  51     size_t kat2len;
  52
  53     /* KAT data for PR */
  54     const unsigned char *entropy_pr;
  55     size_t entropylen_pr;
  56     const unsigned char *nonce_pr;
  57     size_t noncelen_pr;
  58     const unsigned char *pers_pr;
  59     size_t perslen_pr;
  60     const unsigned char *adin_pr;
  61     size_t adinlen_pr;
  62     const unsigned char *entropypr_pr;
  63     size_t entropyprlen_pr;
  64     const unsigned char *ading_pr;
  65     size_t adinglen_pr;
  66     const unsigned char *entropyg_pr;
  67     size_t entropyglen_pr;
  68     const unsigned char *kat_pr;
  69     size_t katlen_pr;
  70     const unsigned char *kat2_pr;
  71     size_t kat2len_pr;
  72 } DRBG_SELFTEST_DATA;
  73
  74 #define make_drbg_test_data(nid, flag, pr, post) {\
  75     post, nid, flag, \
  76     pr##_entropyinput, sizeof(pr##_entropyinput), \
  77     pr##_nonce, sizeof(pr##_nonce), \
  78     pr##_personalizationstring, sizeof(pr##_personalizationstring), \
  79     pr##_additionalinput, sizeof(pr##_additionalinput), \
  80     pr##_entropyinputreseed, sizeof(pr##_entropyinputreseed), \
  81     pr##_additionalinputreseed, sizeof(pr##_additionalinputreseed), \
  82     pr##_additionalinput2, sizeof(pr##_additionalinput2), \
  83     pr##_int_returnedbits, sizeof(pr##_int_returnedbits), \
  84     pr##_returnedbits, sizeof(pr##_returnedbits), \
  85     pr##_pr_entropyinput, sizeof(pr##_pr_entropyinput), \
  86     pr##_pr_nonce, sizeof(pr##_pr_nonce), \
  87     pr##_pr_personalizationstring, sizeof(pr##_pr_personalizationstring), \
  88     pr##_pr_additionalinput, sizeof(pr##_pr_additionalinput), \
  89     pr##_pr_entropyinputpr, sizeof(pr##_pr_entropyinputpr), \
  90     pr##_pr_additionalinput2, sizeof(pr##_pr_additionalinput2), \
  91     pr##_pr_entropyinputpr2, sizeof(pr##_pr_entropyinputpr2), \
  92     pr##_pr_int_returnedbits, sizeof(pr##_pr_int_returnedbits), \
  93     pr##_pr_returnedbits, sizeof(pr##_pr_returnedbits) \
  94     }
  95
  96 #define make_drbg_test_data_use_df(nid, pr, p) \
  97     make_drbg_test_data(nid, 0, pr, p)
  98
  99 #define make_drbg_test_data_no_df(nid, pr, p)                      \
 100     make_drbg_test_data(nid, RAND_DRBG_FLAG_CTR_NO_DF, pr, p)
 101
 102 #define make_drbg_test_data_hash(nid, pr, p) \
 103     make_drbg_test_data(nid, RAND_DRBG_FLAG_HMAC, hmac_##pr, p), \
 104     make_drbg_test_data(nid, 0, pr, p)
 105
 106 static DRBG_SELFTEST_DATA drbg_test[] = {
 107     make_drbg_test_data_no_df (NID_aes_128_ctr, aes_128_no_df,  0),
 108     make_drbg_test_data_no_df (NID_aes_192_ctr, aes_192_no_df,  0),
 109     make_drbg_test_data_no_df (NID_aes_256_ctr, aes_256_no_df,  1),
 110     make_drbg_test_data_use_df(NID_aes_128_ctr, aes_128_use_df, 0),
 111     make_drbg_test_data_use_df(NID_aes_192_ctr, aes_192_use_df, 0),
 112     make_drbg_test_data_use_df(NID_aes_256_ctr, aes_256_use_df, 1),
 113     make_drbg_test_data_hash(NID_sha1, sha1, 0),
 114     make_drbg_test_data_hash(NID_sha224, sha224, 0),
 115     make_drbg_test_data_hash(NID_sha256, sha256, 1),
 116     make_drbg_test_data_hash(NID_sha384, sha384, 0),
 117     make_drbg_test_data_hash(NID_sha512, sha512, 0),
 118 };
 119
 120 static int app_data_index;
 121
 122 /*
 123  * Test context data, attached as EXDATA to the RAND_DRBG
 124  */
 125 typedef struct test_ctx_st {
 126     const unsigned char *entropy;
 127     size_t entropylen;
 128     int entropycnt;
 129     const unsigned char *nonce;
 130     size_t noncelen;
 131     int noncecnt;
 132 } TEST_CTX;
 133
 134 static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
 135                           int entropy, size_t min_len, size_t max_len,
 136                           int prediction_resistance)
 137 {
 138     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 139
 140     t->entropycnt++;
 141     *pout = (unsigned char *)t->entropy;
 142     return t->entropylen;
 143 }
 144
 145 static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout,
 146                         int entropy, size_t min_len, size_t max_len)
 147 {
 148     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 149
 150     t->noncecnt++;
 151     *pout = (unsigned char *)t->nonce;
 152     return t->noncelen;
 153 }
 154
 155  /*
 156  * Disable CRNG testing if it is enabled.
 157  * If the DRBG is ready or in an error state, this means an instantiate cycle
 158  * for which the default personalisation string is used.
 159  */
 160 static int disable_crngt(RAND_DRBG *drbg)
 161 {
 162     static const char pers[] = DRBG_DEFAULT_PERS_STRING;
 163     const int instantiate = drbg->state != DRBG_UNINITIALISED;
 164
 165     if (drbg->get_entropy != rand_crngt_get_entropy)
 166         return 1;
 167
 168      if ((instantiate && !RAND_DRBG_uninstantiate(drbg))
 169         || !TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_drbg_get_entropy,
 170                                               &rand_drbg_cleanup_entropy,
 171                                               &rand_drbg_get_nonce,
 172                                               &rand_drbg_cleanup_nonce))
 173         || (instantiate
 174             && !RAND_DRBG_instantiate(drbg, (const unsigned char *)pers,
 175                                       sizeof(pers) - 1)))
 176         return 0;
 177     return 1;
 178 }
 179
 180 static int uninstantiate(RAND_DRBG *drbg)
 181 {
 182     int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
 183
 184     ERR_clear_error();
 185     return ret;
 186 }
 187
 188 /*
 189  * Do a single KAT test.  Return 0 on failure.
 190  */
 191 static int single_kat(DRBG_SELFTEST_DATA *td)
 192 {
 193     RAND_DRBG *drbg = NULL;
 194     TEST_CTX t;
 195     int failures = 0;
 196     unsigned char buff[1024];
 197
 198     /*
 199      * Test without PR: Instantiate DRBG with test entropy, nonce and
 200      * personalisation string.
 201      */
 202     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
 203         return 0;
 204     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 205                                            kat_nonce, NULL))
 206         || !TEST_true(disable_crngt(drbg))) {
 207         failures++;
 208         goto err;
 209     }
 210     memset(&t, 0, sizeof(t));
 211     t.entropy = td->entropy;
 212     t.entropylen = td->entropylen;
 213     t.nonce = td->nonce;
 214     t.noncelen = td->noncelen;
 215     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 216
 217     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))
 218             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 219                                              td->adin, td->adinlen))
 220             || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen))
 221         failures++;
 222
 223     /* Reseed DRBG with test entropy and additional input */
 224     t.entropy = td->entropyreseed;
 225     t.entropylen = td->entropyreseedlen;
 226     if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen, 0)
 227             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0,
 228                                              td->adin2, td->adin2len))
 229             || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len)))
 230         failures++;
 231     uninstantiate(drbg);
 232
 233     /*
 234      * Now test with PR: Instantiate DRBG with test entropy, nonce and
 235      * personalisation string.
 236      */
 237     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 238             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 239                                                   kat_nonce, NULL)))
 240         failures++;
 241     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 242     t.entropy = td->entropy_pr;
 243     t.entropylen = td->entropylen_pr;
 244     t.nonce = td->nonce_pr;
 245     t.noncelen = td->noncelen_pr;
 246     t.entropycnt = 0;
 247     t.noncecnt = 0;
 248     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr)))
 249         failures++;
 250
 251     /*
 252      * Now generate with PR: we need to supply entropy as this will
 253      * perform a reseed operation.
 254      */
 255     t.entropy = td->entropypr_pr;
 256     t.entropylen = td->entropyprlen_pr;
 257     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1,
 258                                       td->adin_pr, td->adinlen_pr))
 259             || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr))
 260         failures++;
 261
 262     /*
 263      * Now generate again with PR: supply new entropy again.
 264      */
 265     t.entropy = td->entropyg_pr;
 266     t.entropylen = td->entropyglen_pr;
 267
 268     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1,
 269                                       td->ading_pr, td->adinglen_pr))
 270                 || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr,
 271                                 buff, td->kat2len_pr))
 272         failures++;
 273
 274 err:
 275     uninstantiate(drbg);
 276     RAND_DRBG_free(drbg);
 277     return failures == 0;
 278 }
 279
 280 /*
 281  * Initialise a DRBG based on selftest data
 282  */
 283 static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t)
 284 {
 285     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 286             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 287                                                   kat_nonce, NULL)))
 288         return 0;
 289     RAND_DRBG_set_ex_data(drbg, app_data_index, t);
 290     t->entropy = td->entropy;
 291     t->entropylen = td->entropylen;
 292     t->nonce = td->nonce;
 293     t->noncelen = td->noncelen;
 294     t->entropycnt = 0;
 295     t->noncecnt = 0;
 296     return 1;
 297 }
 298
 299 /*
 300  * Initialise and instantiate DRBG based on selftest data
 301  */
 302 static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td,
 303                        TEST_CTX *t)
 304 {
 305     if (!TEST_true(init(drbg, td, t))
 306             || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)))
 307         return 0;
 308     return 1;
 309 }
 310
 311 /*
 312  * Perform extensive error checking as required by SP800-90.
 313  * Induce several failure modes and check an error condition is set.
 314  */
 315 static int error_check(DRBG_SELFTEST_DATA *td)
 316 {
 317     static char zero[sizeof(RAND_DRBG)];
 318     RAND_DRBG *drbg = NULL;
 319     TEST_CTX t;
 320     unsigned char buff[1024];
 321     unsigned int reseed_counter_tmp;
 322     int ret = 0;
 323
 324     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL))
 325         || !TEST_true(disable_crngt(drbg)))
 326         goto err;
 327
 328     /*
 329      * Personalisation string tests
 330      */
 331
 332     /* Test detection of too large personlisation string */
 333     if (!init(drbg, td, &t)
 334             || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0)
 335         goto err;
 336
 337     /*
 338      * Entropy source tests
 339      */
 340
 341     /* Test entropy source failure detection: i.e. returns no data */
 342     t.entropylen = 0;
 343     if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0))
 344         goto err;
 345
 346     /* Try to generate output from uninstantiated DRBG */
 347     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 348                                        td->adin, td->adinlen))
 349             || !uninstantiate(drbg))
 350         goto err;
 351
 352     /* Test insufficient entropy */
 353     t.entropylen = drbg->min_entropylen - 1;
 354     if (!init(drbg, td, &t)
 355             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 356             || !uninstantiate(drbg))
 357         goto err;
 358
 359     /* Test too much entropy */
 360     t.entropylen = drbg->max_entropylen + 1;
 361     if (!init(drbg, td, &t)
 362             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 363             || !uninstantiate(drbg))
 364         goto err;
 365
 366     /*
 367      * Nonce tests
 368      */
 369
 370     /* Test too small nonce */
 371     if (drbg->min_noncelen) {
 372         t.noncelen = drbg->min_noncelen - 1;
 373         if (!init(drbg, td, &t)
 374                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 375                 || !uninstantiate(drbg))
 376             goto err;
 377     }
 378
 379     /* Test too large nonce */
 380     if (drbg->max_noncelen) {
 381         t.noncelen = drbg->max_noncelen + 1;
 382         if (!init(drbg, td, &t)
 383                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 384                 || !uninstantiate(drbg))
 385             goto err;
 386     }
 387
 388     /* Instantiate with valid data, Check generation is now OK */
 389     if (!instantiate(drbg, td, &t)
 390             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 391                                              td->adin, td->adinlen)))
 392         goto err;
 393
 394     /* Request too much data for one request */
 395     if (!TEST_false(RAND_DRBG_generate(drbg, buff, drbg->max_request + 1, 0,
 396                                        td->adin, td->adinlen)))
 397         goto err;
 398
 399     /* Try too large additional input */
 400     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 401                                        td->adin, drbg->max_adinlen + 1)))
 402         goto err;
 403
 404     /*
 405      * Check prediction resistance request fails if entropy source
 406      * failure.
 407      */
 408     t.entropylen = 0;
 409     if (TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 410                                       td->adin, td->adinlen))
 411             || !uninstantiate(drbg))
 412         goto err;
 413
 414     /* Instantiate again with valid data */
 415     if (!instantiate(drbg, td, &t))
 416         goto err;
 417     reseed_counter_tmp = drbg->reseed_gen_counter;
 418     drbg->reseed_gen_counter = drbg->reseed_interval;
 419
 420     /* Generate output and check entropy has been requested for reseed */
 421     t.entropycnt = 0;
 422     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 423                                       td->adin, td->adinlen))
 424             || !TEST_int_eq(t.entropycnt, 1)
 425             || !TEST_int_eq(drbg->reseed_gen_counter, reseed_counter_tmp + 1)
 426             || !uninstantiate(drbg))
 427         goto err;
 428
 429     /*
 430      * Check prediction resistance request fails if entropy source
 431      * failure.
 432      */
 433     t.entropylen = 0;
 434     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 435                                        td->adin, td->adinlen))
 436             || !uninstantiate(drbg))
 437         goto err;
 438
 439     /* Test reseed counter works */
 440     if (!instantiate(drbg, td, &t))
 441         goto err;
 442     reseed_counter_tmp = drbg->reseed_gen_counter;
 443     drbg->reseed_gen_counter = drbg->reseed_interval;
 444
 445     /* Generate output and check entropy has been requested for reseed */
 446     t.entropycnt = 0;
 447     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 448                                       td->adin, td->adinlen))
 449             || !TEST_int_eq(t.entropycnt, 1)
 450             || !TEST_int_eq(drbg->reseed_gen_counter, reseed_counter_tmp + 1)
 451             || !uninstantiate(drbg))
 452         goto err;
 453
 454     /*
 455      * Explicit reseed tests
 456      */
 457
 458     /* Test explicit reseed with too large additional input */
 459     if (!instantiate(drbg, td, &t)
 460             || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1, 0) > 0)
 461         goto err;
 462
 463     /* Test explicit reseed with entropy source failure */
 464     t.entropylen = 0;
 465     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 466             || !uninstantiate(drbg))
 467         goto err;
 468
 469     /* Test explicit reseed with too much entropy */
 470     if (!instantiate(drbg, td, &t))
 471         goto err;
 472     t.entropylen = drbg->max_entropylen + 1;
 473     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 474             || !uninstantiate(drbg))
 475         goto err;
 476
 477     /* Test explicit reseed with too little entropy */
 478     if (!instantiate(drbg, td, &t))
 479         goto err;
 480     t.entropylen = drbg->min_entropylen - 1;
 481     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 482             || !uninstantiate(drbg))
 483         goto err;
 484
 485     /* Standard says we have to check uninstantiate really zeroes */
 486     if (!TEST_mem_eq(zero, sizeof(drbg->data), &drbg->data, sizeof(drbg->data)))
 487         goto err;
 488
 489     ret = 1;
 490
 491 err:
 492     uninstantiate(drbg);
 493     RAND_DRBG_free(drbg);
 494     return ret;
 495 }
 496
 497 static int test_kats(int i)
 498 {
 499     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 500     int rv = 0;
 501
 502     if (!single_kat(td))
 503         goto err;
 504     rv = 1;
 505
 506 err:
 507     return rv;
 508 }
 509
 510 static int test_error_checks(int i)
 511 {
 512     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 513     int rv = 0;
 514
 515     if (error_check(td))
 516         goto err;
 517     rv = 1;
 518
 519 err:
 520     return rv;
 521 }
 522
 523 /*
 524  * Hook context data, attached as EXDATA to the RAND_DRBG
 525  */
 526 typedef struct hook_ctx_st {
 527     RAND_DRBG *drbg;
 528     /*
 529      * Currently, all DRBGs use the same get_entropy() callback.
 530      * The tests however, don't assume this and store
 531      * the original callback for every DRBG separately.
 532      */
 533     RAND_DRBG_get_entropy_fn get_entropy;
 534     /* forces a failure of the get_entropy() call if nonzero */
 535     int fail;
 536     /* counts successful reseeds */
 537     int reseed_count;
 538 } HOOK_CTX;
 539
 540 static HOOK_CTX master_ctx, public_ctx, private_ctx;
 541
 542 static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
 543 {
 544     return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 545 }
 546
 547 /* Intercepts and counts calls to the get_entropy() callback */
 548 static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout,
 549                               int entropy, size_t min_len, size_t max_len,
 550                               int prediction_resistance)
 551 {
 552     size_t ret;
 553     HOOK_CTX *ctx = get_hook_ctx(drbg);
 554
 555     if (ctx->fail != 0)
 556         return 0;
 557
 558     ret = ctx->get_entropy(drbg, pout, entropy, min_len, max_len,
 559                            prediction_resistance);
 560
 561     if (ret != 0)
 562         ctx->reseed_count++;
 563     return ret;
 564 }
 565
 566 /* Installs a hook for the get_entropy() callback of the given drbg */
 567 static void hook_drbg(RAND_DRBG *drbg, HOOK_CTX *ctx)
 568 {
 569     memset(ctx, 0, sizeof(*ctx));
 570     ctx->drbg = drbg;
 571     ctx->get_entropy = drbg->get_entropy;
 572     drbg->get_entropy = get_entropy_hook;
 573     RAND_DRBG_set_ex_data(drbg, app_data_index, ctx);
 574 }
 575
 576 /* Installs the hook for the get_entropy() callback of the given drbg */
 577 static void unhook_drbg(RAND_DRBG *drbg)
 578 {
 579     HOOK_CTX *ctx = get_hook_ctx(drbg);
 580
 581     drbg->get_entropy = ctx->get_entropy;
 582     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data);
 583 }
 584
 585 /* Resets the given hook context */
 586 static void reset_hook_ctx(HOOK_CTX *ctx)
 587 {
 588     ctx->fail = 0;
 589     ctx->reseed_count = 0;
 590 }
 591
 592 /* Resets all drbg hook contexts */
 593 static void reset_drbg_hook_ctx(void)
 594 {
 595     reset_hook_ctx(&master_ctx);
 596     reset_hook_ctx(&public_ctx);
 597     reset_hook_ctx(&private_ctx);
 598 }
 599
 600 /*
 601  * Generates random output using RAND_bytes() and RAND_priv_bytes()
 602  * and checks whether the three shared DRBGs were reseeded as
 603  * expected.
 604  *
 605  * |expect_success|: expected outcome (as reported by RAND_status())
 606  * |master|, |public|, |private|: pointers to the three shared DRBGs
 607  * |expect_xxx_reseed| =
 608  *       1:  it is expected that the specified DRBG is reseeded
 609  *       0:  it is expected that the specified DRBG is not reseeded
 610  *      -1:  don't check whether the specified DRBG was reseeded or not
 611  * |reseed_time|: if nonzero, used instead of time(NULL) to set the
 612  *                |before_reseed| time.
 613  */
 614 static int test_drbg_reseed(int expect_success,
 615                             RAND_DRBG *master,
 616                             RAND_DRBG *public,
 617                             RAND_DRBG *private,
 618                             int expect_master_reseed,
 619                             int expect_public_reseed,
 620                             int expect_private_reseed,
 621                             time_t reseed_time
 622                            )
 623 {
 624     unsigned char buf[32];
 625     time_t before_reseed, after_reseed;
 626     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
 627
 628     /*
 629      * step 1: check preconditions
 630      */
 631
 632     /* Test whether seed propagation is enabled */
 633     if (!TEST_int_ne(master->reseed_prop_counter, 0)
 634         || !TEST_int_ne(public->reseed_prop_counter, 0)
 635         || !TEST_int_ne(private->reseed_prop_counter, 0))
 636         return 0;
 637
 638     /* Check whether the master DRBG's reseed counter is the largest one */
 639     if (!TEST_int_le(public->reseed_prop_counter, master->reseed_prop_counter)
 640         || !TEST_int_le(private->reseed_prop_counter, master->reseed_prop_counter))
 641         return 0;
 642
 643     /*
 644      * step 2: generate random output
 645      */
 646
 647     if (reseed_time == 0)
 648         reseed_time = time(NULL);
 649
 650     /* Generate random output from the public and private DRBG */
 651     before_reseed = expect_master_reseed == 1 ? reseed_time : 0;
 652     if (!TEST_int_eq(RAND_bytes(buf, sizeof(buf)), expect_success)
 653         || !TEST_int_eq(RAND_priv_bytes(buf, sizeof(buf)), expect_success))
 654         return 0;
 655     after_reseed = time(NULL);
 656
 657
 658     /*
 659      * step 3: check postconditions
 660      */
 661
 662     /* Test whether reseeding succeeded as expected */
 663     if (!TEST_int_eq(master->state, expected_state)
 664         || !TEST_int_eq(public->state, expected_state)
 665         || !TEST_int_eq(private->state, expected_state))
 666         return 0;
 667
 668     if (expect_master_reseed >= 0) {
 669         /* Test whether master DRBG was reseeded as expected */
 670         if (!TEST_int_eq(master_ctx.reseed_count, expect_master_reseed))
 671             return 0;
 672     }
 673
 674     if (expect_public_reseed >= 0) {
 675         /* Test whether public DRBG was reseeded as expected */
 676         if (!TEST_int_eq(public_ctx.reseed_count, expect_public_reseed))
 677             return 0;
 678     }
 679
 680     if (expect_private_reseed >= 0) {
 681         /* Test whether public DRBG was reseeded as expected */
 682         if (!TEST_int_eq(private_ctx.reseed_count, expect_private_reseed))
 683             return 0;
 684     }
 685
 686     if (expect_success == 1) {
 687         /* Test whether all three reseed counters are synchronized */
 688         if (!TEST_int_eq(public->reseed_prop_counter, master->reseed_prop_counter)
 689             || !TEST_int_eq(private->reseed_prop_counter, master->reseed_prop_counter))
 690             return 0;
 691
 692         /* Test whether reseed time of master DRBG is set correctly */
 693         if (!TEST_time_t_le(before_reseed, master->reseed_time)
 694             || !TEST_time_t_le(master->reseed_time, after_reseed))
 695             return 0;
 696
 697         /* Test whether reseed times of child DRBGs are synchronized with master */
 698         if (!TEST_time_t_ge(public->reseed_time, master->reseed_time)
 699             || !TEST_time_t_ge(private->reseed_time, master->reseed_time))
 700             return 0;
 701     } else {
 702         ERR_clear_error();
 703     }
 704
 705     return 1;
 706 }
 707
 708 /*
 709  * Test whether the default rand_method (RAND_OpenSSL()) is
 710  * setup correctly, in particular whether reseeding  works
 711  * as designed.
 712  */
 713 static int test_rand_drbg_reseed(void)
 714 {
 715     RAND_DRBG *master, *public, *private;
 716     unsigned char rand_add_buf[256];
 717     int rv=0;
 718     time_t before_reseed;
 719
 720     /* Check whether RAND_OpenSSL() is the default method */
 721     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
 722         return 0;
 723
 724     /* All three DRBGs should be non-null */
 725     if (!TEST_ptr(master = RAND_DRBG_get0_master())
 726         || !TEST_ptr(public = RAND_DRBG_get0_public())
 727         || !TEST_ptr(private = RAND_DRBG_get0_private()))
 728         return 0;
 729
 730     /* There should be three distinct DRBGs, two of them chained to master */
 731     if (!TEST_ptr_ne(public, private)
 732         || !TEST_ptr_ne(public, master)
 733         || !TEST_ptr_ne(private, master)
 734         || !TEST_ptr_eq(public->parent, master)
 735         || !TEST_ptr_eq(private->parent, master))
 736         return 0;
 737
 738     /* Disable CRNG testing for the master DRBG */
 739     if (!TEST_true(disable_crngt(master)))
 740         return 0;
 741
 742     /* uninstantiate the three global DRBGs */
 743     RAND_DRBG_uninstantiate(private);
 744     RAND_DRBG_uninstantiate(public);
 745     RAND_DRBG_uninstantiate(master);
 746
 747
 748     /* Install hooks for the following tests */
 749     hook_drbg(master,  &master_ctx);
 750     hook_drbg(public,  &public_ctx);
 751     hook_drbg(private, &private_ctx);
 752
 753
 754     /*
 755      * Test initial seeding of shared DRBGs
 756      */
 757     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1, 0)))
 758         goto error;
 759     reset_drbg_hook_ctx();
 760
 761
 762     /*
 763      * Test initial state of shared DRBGs
 764      */
 765     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 0, 0)))
 766         goto error;
 767     reset_drbg_hook_ctx();
 768
 769     /*
 770      * Test whether the public and private DRBG are both reseeded when their
 771      * reseed counters differ from the master's reseed counter.
 772      */
 773     master->reseed_prop_counter++;
 774     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 1, 0)))
 775         goto error;
 776     reset_drbg_hook_ctx();
 777
 778     /*
 779      * Test whether the public DRBG is reseeded when its reseed counter differs
 780      * from the master's reseed counter.
 781      */
 782     master->reseed_prop_counter++;
 783     private->reseed_prop_counter++;
 784     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 0, 0)))
 785         goto error;
 786     reset_drbg_hook_ctx();
 787
 788     /*
 789      * Test whether the private DRBG is reseeded when its reseed counter differs
 790      * from the master's reseed counter.
 791      */
 792     master->reseed_prop_counter++;
 793     public->reseed_prop_counter++;
 794     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 1, 0)))
 795         goto error;
 796     reset_drbg_hook_ctx();
 797
 798
 799     /* fill 'randomness' buffer with some arbitrary data */
 800     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
 801
 802     /*
 803      * Test whether all three DRBGs are reseeded by RAND_add().
 804      * The before_reseed time has to be measured here and passed into the
 805      * test_drbg_reseed() test, because the master DRBG gets already reseeded
 806      * in RAND_add(), whence the check for the condition
 807      * before_reseed <= master->reseed_time will fail if the time value happens
 808      * to increase between the RAND_add() and the test_drbg_reseed() call.
 809      */
 810     before_reseed = time(NULL);
 811     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 812     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1,
 813                                     before_reseed)))
 814         goto error;
 815     reset_drbg_hook_ctx();
 816
 817
 818     /*
 819      * Test whether none of the DRBGs is reseed if the master fails to reseed
 820      */
 821     master_ctx.fail = 1;
 822     master->reseed_prop_counter++;
 823     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 824     if (!TEST_true(test_drbg_reseed(0, master, public, private, 0, 0, 0, 0)))
 825         goto error;
 826     reset_drbg_hook_ctx();
 827
 828     rv = 1;
 829
 830 error:
 831     /* Remove hooks  */
 832     unhook_drbg(master);
 833     unhook_drbg(public);
 834     unhook_drbg(private);
 835
 836     return rv;
 837 }
 838
 839 #if defined(OPENSSL_THREADS)
 840 static int multi_thread_rand_bytes_succeeded = 1;
 841 static int multi_thread_rand_priv_bytes_succeeded = 1;
 842
 843 static void run_multi_thread_test(void)
 844 {
 845     unsigned char buf[256];
 846     time_t start = time(NULL);
 847     RAND_DRBG *public = NULL, *private = NULL;
 848
 849     if (!TEST_ptr(public = RAND_DRBG_get0_public())
 850             || !TEST_ptr(private = RAND_DRBG_get0_private())) {
 851         multi_thread_rand_bytes_succeeded = 0;
 852         return;
 853     }
 854     RAND_DRBG_set_reseed_time_interval(private, 1);
 855     RAND_DRBG_set_reseed_time_interval(public, 1);
 856
 857     do {
 858         if (RAND_bytes(buf, sizeof(buf)) <= 0)
 859             multi_thread_rand_bytes_succeeded = 0;
 860         if (RAND_priv_bytes(buf, sizeof(buf)) <= 0)
 861             multi_thread_rand_priv_bytes_succeeded = 0;
 862     }
 863     while(time(NULL) - start < 5);
 864 }
 865
 866 # if defined(OPENSSL_SYS_WINDOWS)
 867
 868 typedef HANDLE thread_t;
 869
 870 static DWORD WINAPI thread_run(LPVOID arg)
 871 {
 872     run_multi_thread_test();
 873     /*
 874      * Because we're linking with a static library, we must stop each
 875      * thread explicitly, or so says OPENSSL_thread_stop(3)
 876      */
 877     OPENSSL_thread_stop();
 878     return 0;
 879 }
 880
 881 static int run_thread(thread_t *t)
 882 {
 883     *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL);
 884     return *t != NULL;
 885 }
 886
 887 static int wait_for_thread(thread_t thread)
 888 {
 889     return WaitForSingleObject(thread, INFINITE) == 0;
 890 }
 891
 892 # else
 893
 894 typedef pthread_t thread_t;
 895
 896 static void *thread_run(void *arg)
 897 {
 898     run_multi_thread_test();
 899     /*
 900      * Because we're linking with a static library, we must stop each
 901      * thread explicitly, or so says OPENSSL_thread_stop(3)
 902      */
 903     OPENSSL_thread_stop();
 904     return NULL;
 905 }
 906
 907 static int run_thread(thread_t *t)
 908 {
 909     return pthread_create(t, NULL, thread_run, NULL) == 0;
 910 }
 911
 912 static int wait_for_thread(thread_t thread)
 913 {
 914     return pthread_join(thread, NULL) == 0;
 915 }
 916
 917 # endif
 918
 919 /*
 920  * The main thread will also run the test, so we'll have THREADS+1 parallel
 921  * tests running
 922  */
 923 # define THREADS 3
 924
 925 static int test_multi_thread(void)
 926 {
 927     thread_t t[THREADS];
 928     int i;
 929
 930     for (i = 0; i < THREADS; i++)
 931         run_thread(&t[i]);
 932     run_multi_thread_test();
 933     for (i = 0; i < THREADS; i++)
 934         wait_for_thread(t[i]);
 935
 936     if (!TEST_true(multi_thread_rand_bytes_succeeded))
 937         return 0;
 938     if (!TEST_true(multi_thread_rand_priv_bytes_succeeded))
 939         return 0;
 940
 941     return 1;
 942 }
 943 #endif
 944
 945 /*
 946  * Test that instantiation with RAND_seed() works as expected
 947  *
 948  * If no os entropy source is available then RAND_seed(buffer, bufsize)
 949  * is expected to succeed if and only if the buffer length is at least
 950  * rand_drbg_seedlen(master) bytes.
 951  *
 952  * If an os entropy source is available then RAND_seed(buffer, bufsize)
 953  * is expected to succeed always.
 954  */
 955 static int test_rand_seed(void)
 956 {
 957     RAND_DRBG *master = NULL;
 958     unsigned char rand_buf[256];
 959     size_t rand_buflen;
 960     size_t required_seed_buflen = 0;
 961
 962     if (!TEST_ptr(master = RAND_DRBG_get0_master())
 963         || !TEST_true(disable_crngt(master)))
 964         return 0;
 965
 966 #ifdef OPENSSL_RAND_SEED_NONE
 967     required_seed_buflen = rand_drbg_seedlen(master);
 968 #endif
 969
 970     memset(rand_buf, 0xCD, sizeof(rand_buf));
 971
 972     for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) {
 973         RAND_DRBG_uninstantiate(master);
 974         RAND_seed(rand_buf, rand_buflen);
 975
 976         if (!TEST_int_eq(RAND_status(),
 977                          (rand_buflen >= required_seed_buflen)))
 978             return 0;
 979     }
 980
 981     return 1;
 982 }
 983
 984 /*
 985  * Test that adding additional data with RAND_add() works as expected
 986  * when the master DRBG is instantiated (and below its reseed limit).
 987  *
 988  * This should succeed regardless of whether an os entropy source is
 989  * available or not.
 990  */
 991 static int test_rand_add(void)
 992 {
 993     unsigned char rand_buf[256];
 994     size_t rand_buflen;
 995
 996     memset(rand_buf, 0xCD, sizeof(rand_buf));
 997
 998     /* make sure it's instantiated */
 999     RAND_seed(rand_buf, sizeof(rand_buf));
1000     if (!TEST_true(RAND_status()))
1001         return 0;
1002
1003     for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) {
1004         RAND_add(rand_buf, rand_buflen, 0.0);
1005         if (!TEST_true(RAND_status()))
1006             return 0;
1007     }
1008
1009     return 1;
1010 }
1011
1012 static int test_multi_set(void)
1013 {
1014     int rv = 0;
1015     RAND_DRBG *drbg = NULL;
1016
1017     /* init drbg with default CTR initializer */
1018     if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL))
1019         || !TEST_true(disable_crngt(drbg)))
1020         goto err;
1021     /* change it to use hmac */
1022     if (!TEST_true(RAND_DRBG_set(drbg, NID_sha1, RAND_DRBG_FLAG_HMAC)))
1023         goto err;
1024     /* use same type */
1025     if (!TEST_true(RAND_DRBG_set(drbg, NID_sha1, RAND_DRBG_FLAG_HMAC)))
1026         goto err;
1027     /* change it to use hash */
1028     if (!TEST_true(RAND_DRBG_set(drbg, NID_sha256, 0)))
1029         goto err;
1030     /* use same type */
1031     if (!TEST_true(RAND_DRBG_set(drbg, NID_sha256, 0)))
1032         goto err;
1033     /* change it to use ctr */
1034     if (!TEST_true(RAND_DRBG_set(drbg, NID_aes_192_ctr, 0)))
1035         goto err;
1036     /* use same type */
1037     if (!TEST_true(RAND_DRBG_set(drbg, NID_aes_192_ctr, 0)))
1038         goto err;
1039     if (!TEST_int_gt(RAND_DRBG_instantiate(drbg, NULL, 0), 0))
1040         goto err;
1041
1042     rv = 1;
1043 err:
1044     uninstantiate(drbg);
1045     RAND_DRBG_free(drbg);
1046     return rv;
1047 }
1048
1049 static int test_set_defaults(void)
1050 {
1051     RAND_DRBG *master = NULL, *public = NULL, *private = NULL;
1052
1053            /* Check the default type and flags for master, public and private */
1054     return TEST_ptr(master = RAND_DRBG_get0_master())
1055            && TEST_ptr(public = RAND_DRBG_get0_public())
1056            && TEST_ptr(private = RAND_DRBG_get0_private())
1057            && TEST_int_eq(master->type, RAND_DRBG_TYPE)
1058            && TEST_int_eq(master->flags,
1059                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_MASTER)
1060            && TEST_int_eq(public->type, RAND_DRBG_TYPE)
1061            && TEST_int_eq(public->flags,
1062                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC)
1063            && TEST_int_eq(private->type, RAND_DRBG_TYPE)
1064            && TEST_int_eq(private->flags,
1065                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIVATE)
1066
1067            /* change master DRBG and check again */
1068            && TEST_true(RAND_DRBG_set_defaults(NID_sha256,
1069                                                RAND_DRBG_FLAG_MASTER))
1070            && TEST_true(RAND_DRBG_uninstantiate(master))
1071            && TEST_int_eq(master->type, NID_sha256)
1072            && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER)
1073            && TEST_int_eq(public->type, RAND_DRBG_TYPE)
1074            && TEST_int_eq(public->flags,
1075                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC)
1076            && TEST_int_eq(private->type, RAND_DRBG_TYPE)
1077            && TEST_int_eq(private->flags,
1078                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIVATE)
1079            /* change private DRBG and check again */
1080            && TEST_true(RAND_DRBG_set_defaults(NID_sha256,
1081                         RAND_DRBG_FLAG_PRIVATE|RAND_DRBG_FLAG_HMAC))
1082            && TEST_true(RAND_DRBG_uninstantiate(private))
1083            && TEST_int_eq(master->type, NID_sha256)
1084            && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER)
1085            && TEST_int_eq(public->type, RAND_DRBG_TYPE)
1086            && TEST_int_eq(public->flags,
1087                           RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC)
1088            && TEST_int_eq(private->type, NID_sha256)
1089            && TEST_int_eq(private->flags,
1090                           RAND_DRBG_FLAG_PRIVATE | RAND_DRBG_FLAG_HMAC)
1091            /* change public DRBG and check again */
1092            && TEST_true(RAND_DRBG_set_defaults(NID_sha1,
1093                                                RAND_DRBG_FLAG_PUBLIC
1094                                                | RAND_DRBG_FLAG_HMAC))
1095            && TEST_true(RAND_DRBG_uninstantiate(public))
1096            && TEST_int_eq(master->type, NID_sha256)
1097            && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER)
1098            && TEST_int_eq(public->type, NID_sha1)
1099            && TEST_int_eq(public->flags,
1100                           RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_HMAC)
1101            && TEST_int_eq(private->type, NID_sha256)
1102            && TEST_int_eq(private->flags,
1103                           RAND_DRBG_FLAG_PRIVATE | RAND_DRBG_FLAG_HMAC)
1104            /* Change DRBG defaults and change public and check again */
1105            && TEST_true(RAND_DRBG_set_defaults(NID_sha256, 0))
1106            && TEST_true(RAND_DRBG_uninstantiate(public))
1107            && TEST_int_eq(public->type, NID_sha256)
1108            && TEST_int_eq(public->flags, RAND_DRBG_FLAG_PUBLIC)
1109
1110            /* Change DRBG defaults and change master and check again */
1111            && TEST_true(RAND_DRBG_set_defaults(NID_aes_256_ctr,
1112                                                RAND_DRBG_FLAG_CTR_NO_DF))
1113            && TEST_true(RAND_DRBG_uninstantiate(master))
1114            && TEST_int_eq(master->type, NID_aes_256_ctr)
1115            && TEST_int_eq(master->flags,
1116                           RAND_DRBG_FLAG_MASTER|RAND_DRBG_FLAG_CTR_NO_DF)
1117
1118            /* Reset back to the standard defaults */
1119            && TEST_true(RAND_DRBG_set_defaults(RAND_DRBG_TYPE,
1120                                                RAND_DRBG_FLAGS
1121                                                | RAND_DRBG_FLAG_MASTER
1122                                                | RAND_DRBG_FLAG_PUBLIC
1123                                                | RAND_DRBG_FLAG_PRIVATE))
1124            && TEST_true(RAND_DRBG_uninstantiate(master))
1125            && TEST_true(RAND_DRBG_uninstantiate(public))
1126            && TEST_true(RAND_DRBG_uninstantiate(private));
1127 }
1128
1129 /*
1130  * A list of the FIPS DRGB types.
1131  * Because of the way HMAC DRGBs are implemented, both the NID and flags
1132  * are required.
1133  */
1134 static const struct s_drgb_types {
1135     int nid;
1136     int flags;
1137 } drgb_types[] = {
1138     { NID_aes_128_ctr,  0                   },
1139     { NID_aes_192_ctr,  0                   },
1140     { NID_aes_256_ctr,  0                   },
1141     { NID_sha1,         0                   },
1142     { NID_sha224,       0                   },
1143     { NID_sha256,       0                   },
1144     { NID_sha384,       0                   },
1145     { NID_sha512,       0                   },
1146     { NID_sha512_224,   0                   },
1147     { NID_sha512_256,   0                   },
1148     { NID_sha3_224,     0                   },
1149     { NID_sha3_256,     0                   },
1150     { NID_sha3_384,     0                   },
1151     { NID_sha3_512,     0                   },
1152     { NID_sha1,         RAND_DRBG_FLAG_HMAC },
1153     { NID_sha224,       RAND_DRBG_FLAG_HMAC },
1154     { NID_sha256,       RAND_DRBG_FLAG_HMAC },
1155     { NID_sha384,       RAND_DRBG_FLAG_HMAC },
1156     { NID_sha512,       RAND_DRBG_FLAG_HMAC },
1157     { NID_sha512_224,   RAND_DRBG_FLAG_HMAC },
1158     { NID_sha512_256,   RAND_DRBG_FLAG_HMAC },
1159     { NID_sha3_224,     RAND_DRBG_FLAG_HMAC },
1160     { NID_sha3_256,     RAND_DRBG_FLAG_HMAC },
1161     { NID_sha3_384,     RAND_DRBG_FLAG_HMAC },
1162     { NID_sha3_512,     RAND_DRBG_FLAG_HMAC },
1163 };
1164
1165 /* Six cases for each covers seed sizes up to 32 bytes */
1166 static const size_t crngt_num_cases = 6;
1167
1168 static size_t crngt_case, crngt_idx;
1169
1170 static int crngt_entropy_cb(unsigned char *buf)
1171 {
1172     size_t i, z;
1173
1174     if (!TEST_int_lt(crngt_idx, crngt_num_cases))
1175         return 0;
1176     /* Generate a block of unique data unless this is the duplication point */
1177     z = crngt_idx++;
1178     if (z > 0 && crngt_case == z)
1179         z--;
1180     for (i = 0; i < CRNGT_BUFSIZ; i++)
1181         buf[i] = (unsigned char)(i + 'A' + z);
1182     return 1;
1183 }
1184
1185 static int test_crngt(int n)
1186 {
1187     const struct s_drgb_types *dt = drgb_types + n / crngt_num_cases;
1188     RAND_DRBG *drbg = NULL;
1189     unsigned char buff[100];
1190     size_t ent;
1191     int res = 0;
1192     int expect;
1193
1194     if (!TEST_true(rand_crngt_single_init()))
1195         return 0;
1196     rand_crngt_cleanup();
1197
1198     if (!TEST_ptr(drbg = RAND_DRBG_new(dt->nid, dt->flags, NULL)))
1199         return 0;
1200     ent = (drbg->min_entropylen + CRNGT_BUFSIZ - 1) / CRNGT_BUFSIZ;
1201     crngt_case = n % crngt_num_cases;
1202     crngt_idx = 0;
1203     crngt_get_entropy = &crngt_entropy_cb;
1204     if (!TEST_true(rand_crngt_init()))
1205         goto err;
1206 #ifndef FIPS_MODE
1207     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_crngt_get_entropy,
1208                                            &rand_crngt_cleanup_entropy,
1209                                            &rand_drbg_get_nonce,
1210                                            &rand_drbg_cleanup_nonce)))
1211         goto err;
1212 #endif
1213     expect = crngt_case == 0 || crngt_case > ent;
1214     if (!TEST_int_eq(RAND_DRBG_instantiate(drbg, NULL, 0), expect))
1215         goto err;
1216     if (!expect)
1217         goto fin;
1218     if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
1219         goto err;
1220
1221     expect = crngt_case == 0 || crngt_case > 2 * ent;
1222     if (!TEST_int_eq(RAND_DRBG_reseed(drbg, NULL, 0, 0), expect))
1223         goto err;
1224     if (!expect)
1225         goto fin;
1226     if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
1227         goto err;
1228
1229 fin:
1230     res = 1;
1231 err:
1232     if (!res)
1233         TEST_note("DRBG %zd case %zd block %zd", n / crngt_num_cases,
1234                   crngt_case, crngt_idx);
1235     uninstantiate(drbg);
1236     RAND_DRBG_free(drbg);
1237     crngt_get_entropy = &rand_crngt_get_entropy_cb;
1238     return res;
1239 }
1240
1241 int setup_tests(void)
1242 {
1243     app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
1244
1245     ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test));
1246     ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test));
1247     ADD_TEST(test_rand_drbg_reseed);
1248     ADD_TEST(test_rand_seed);
1249     ADD_TEST(test_rand_add);
1250     ADD_TEST(test_multi_set);
1251     ADD_TEST(test_set_defaults);
1252 #if defined(OPENSSL_THREADS)
1253     ADD_TEST(test_multi_thread);
1254 #endif
1255     ADD_ALL_TESTS(test_crngt, crngt_num_cases * OSSL_NELEM(drgb_types));
1256     return 1;
1257 }