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 #if defined(_WIN32)
  21 # include <windows.h>
  22 #endif
  23
  24 #include "testutil.h"
  25 #include "drbgtest.h"
  26
  27 typedef struct drbg_selftest_data_st {
  28     int post;
  29     int nid;
  30     unsigned int flags;
  31
  32     /* KAT data for no PR */
  33     const unsigned char *entropy;
  34     size_t entropylen;
  35     const unsigned char *nonce;
  36     size_t noncelen;
  37     const unsigned char *pers;
  38     size_t perslen;
  39     const unsigned char *adin;
  40     size_t adinlen;
  41     const unsigned char *entropyreseed;
  42     size_t entropyreseedlen;
  43     const unsigned char *adinreseed;
  44     size_t adinreseedlen;
  45     const unsigned char *adin2;
  46     size_t adin2len;
  47     const unsigned char *expected;
  48     size_t exlen;
  49     const unsigned char *kat2;
  50     size_t kat2len;
  51
  52     /* KAT data for PR */
  53     const unsigned char *entropy_pr;
  54     size_t entropylen_pr;
  55     const unsigned char *nonce_pr;
  56     size_t noncelen_pr;
  57     const unsigned char *pers_pr;
  58     size_t perslen_pr;
  59     const unsigned char *adin_pr;
  60     size_t adinlen_pr;
  61     const unsigned char *entropypr_pr;
  62     size_t entropyprlen_pr;
  63     const unsigned char *ading_pr;
  64     size_t adinglen_pr;
  65     const unsigned char *entropyg_pr;
  66     size_t entropyglen_pr;
  67     const unsigned char *kat_pr;
  68     size_t katlen_pr;
  69     const unsigned char *kat2_pr;
  70     size_t kat2len_pr;
  71 } DRBG_SELFTEST_DATA;
  72
  73 #define make_drbg_test_data(nid, flag, pr, post) {\
  74     post, nid, flag, \
  75     pr##_entropyinput, sizeof(pr##_entropyinput), \
  76     pr##_nonce, sizeof(pr##_nonce), \
  77     pr##_personalizationstring, sizeof(pr##_personalizationstring), \
  78     pr##_additionalinput, sizeof(pr##_additionalinput), \
  79     pr##_entropyinputreseed, sizeof(pr##_entropyinputreseed), \
  80     pr##_additionalinputreseed, sizeof(pr##_additionalinputreseed), \
  81     pr##_additionalinput2, sizeof(pr##_additionalinput2), \
  82     pr##_int_returnedbits, sizeof(pr##_int_returnedbits), \
  83     pr##_returnedbits, sizeof(pr##_returnedbits), \
  84     pr##_pr_entropyinput, sizeof(pr##_pr_entropyinput), \
  85     pr##_pr_nonce, sizeof(pr##_pr_nonce), \
  86     pr##_pr_personalizationstring, sizeof(pr##_pr_personalizationstring), \
  87     pr##_pr_additionalinput, sizeof(pr##_pr_additionalinput), \
  88     pr##_pr_entropyinputpr, sizeof(pr##_pr_entropyinputpr), \
  89     pr##_pr_additionalinput2, sizeof(pr##_pr_additionalinput2), \
  90     pr##_pr_entropyinputpr2, sizeof(pr##_pr_entropyinputpr2), \
  91     pr##_pr_int_returnedbits, sizeof(pr##_pr_int_returnedbits), \
  92     pr##_pr_returnedbits, sizeof(pr##_pr_returnedbits) \
  93     }
  94
  95 #define make_drbg_test_data_use_df(nid, pr, p) \
  96     make_drbg_test_data(nid, 0, pr, p)
  97
  98 #define make_drbg_test_data_no_df(nid, pr, p)                      \
  99     make_drbg_test_data(nid, RAND_DRBG_FLAG_CTR_NO_DF, pr, p)
 100
 101 static DRBG_SELFTEST_DATA drbg_test[] = {
 102     make_drbg_test_data_no_df (NID_aes_128_ctr, aes_128_no_df,  0),
 103     make_drbg_test_data_no_df (NID_aes_192_ctr, aes_192_no_df,  0),
 104     make_drbg_test_data_no_df (NID_aes_256_ctr, aes_256_no_df,  1),
 105     make_drbg_test_data_use_df(NID_aes_128_ctr, aes_128_use_df, 0),
 106     make_drbg_test_data_use_df(NID_aes_192_ctr, aes_192_use_df, 0),
 107     make_drbg_test_data_use_df(NID_aes_256_ctr, aes_256_use_df, 1),
 108 };
 109
 110 static int app_data_index;
 111
 112 /*
 113  * Test context data, attached as EXDATA to the RAND_DRBG
 114  */
 115 typedef struct test_ctx_st {
 116     const unsigned char *entropy;
 117     size_t entropylen;
 118     int entropycnt;
 119     const unsigned char *nonce;
 120     size_t noncelen;
 121     int noncecnt;
 122 } TEST_CTX;
 123
 124 static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
 125                           int entropy, size_t min_len, size_t max_len,
 126                           int prediction_resistance)
 127 {
 128     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 129
 130     t->entropycnt++;
 131     *pout = (unsigned char *)t->entropy;
 132     return t->entropylen;
 133 }
 134
 135 static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout,
 136                         int entropy, size_t min_len, size_t max_len)
 137 {
 138     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 139
 140     t->noncecnt++;
 141     *pout = (unsigned char *)t->nonce;
 142     return t->noncelen;
 143 }
 144
 145 static int uninstantiate(RAND_DRBG *drbg)
 146 {
 147     int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
 148
 149     ERR_clear_error();
 150     return ret;
 151 }
 152
 153 /*
 154  * Do a single KAT test.  Return 0 on failure.
 155  */
 156 static int single_kat(DRBG_SELFTEST_DATA *td)
 157 {
 158     RAND_DRBG *drbg = NULL;
 159     TEST_CTX t;
 160     int failures = 0;
 161     unsigned char buff[1024];
 162
 163     /*
 164      * Test without PR: Instantiate DRBG with test entropy, nonce and
 165      * personalisation string.
 166      */
 167     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
 168         return 0;
 169     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 170                                            kat_nonce, NULL))) {
 171         failures++;
 172         goto err;
 173     }
 174     memset(&t, 0, sizeof(t));
 175     t.entropy = td->entropy;
 176     t.entropylen = td->entropylen;
 177     t.nonce = td->nonce;
 178     t.noncelen = td->noncelen;
 179     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 180
 181     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))
 182             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 183                                              td->adin, td->adinlen))
 184             || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen))
 185         failures++;
 186
 187     /* Reseed DRBG with test entropy and additional input */
 188     t.entropy = td->entropyreseed;
 189     t.entropylen = td->entropyreseedlen;
 190     if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen, 0)
 191             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0,
 192                                              td->adin2, td->adin2len))
 193             || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len)))
 194         failures++;
 195     uninstantiate(drbg);
 196
 197     /*
 198      * Now test with PR: Instantiate DRBG with test entropy, nonce and
 199      * personalisation string.
 200      */
 201     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 202             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 203                                                   kat_nonce, NULL)))
 204         failures++;
 205     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 206     t.entropy = td->entropy_pr;
 207     t.entropylen = td->entropylen_pr;
 208     t.nonce = td->nonce_pr;
 209     t.noncelen = td->noncelen_pr;
 210     t.entropycnt = 0;
 211     t.noncecnt = 0;
 212     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr)))
 213         failures++;
 214
 215     /*
 216      * Now generate with PR: we need to supply entropy as this will
 217      * perform a reseed operation.
 218      */
 219     t.entropy = td->entropypr_pr;
 220     t.entropylen = td->entropyprlen_pr;
 221     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1,
 222                                       td->adin_pr, td->adinlen_pr))
 223             || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr))
 224         failures++;
 225
 226     /*
 227      * Now generate again with PR: supply new entropy again.
 228      */
 229     t.entropy = td->entropyg_pr;
 230     t.entropylen = td->entropyglen_pr;
 231
 232     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1,
 233                                       td->ading_pr, td->adinglen_pr))
 234                 || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr,
 235                                 buff, td->kat2len_pr))
 236         failures++;
 237
 238 err:
 239     uninstantiate(drbg);
 240     RAND_DRBG_free(drbg);
 241     return failures == 0;
 242 }
 243
 244 /*
 245  * Initialise a DRBG based on selftest data
 246  */
 247 static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t)
 248 {
 249     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 250             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 251                                                   kat_nonce, NULL)))
 252         return 0;
 253     RAND_DRBG_set_ex_data(drbg, app_data_index, t);
 254     t->entropy = td->entropy;
 255     t->entropylen = td->entropylen;
 256     t->nonce = td->nonce;
 257     t->noncelen = td->noncelen;
 258     t->entropycnt = 0;
 259     t->noncecnt = 0;
 260     return 1;
 261 }
 262
 263 /*
 264  * Initialise and instantiate DRBG based on selftest data
 265  */
 266 static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td,
 267                        TEST_CTX *t)
 268 {
 269     if (!TEST_true(init(drbg, td, t))
 270             || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)))
 271         return 0;
 272     return 1;
 273 }
 274
 275 /*
 276  * Perform extensive error checking as required by SP800-90.
 277  * Induce several failure modes and check an error condition is set.
 278  */
 279 static int error_check(DRBG_SELFTEST_DATA *td)
 280 {
 281     static char zero[sizeof(RAND_DRBG)];
 282     RAND_DRBG *drbg = NULL;
 283     TEST_CTX t;
 284     unsigned char buff[1024];
 285     unsigned int generate_counter_tmp;
 286     int ret = 0;
 287
 288     if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)))
 289         goto err;
 290
 291     /*
 292      * Personalisation string tests
 293      */
 294
 295     /* Test detection of too large personlisation string */
 296     if (!init(drbg, td, &t)
 297             || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0)
 298         goto err;
 299
 300     /*
 301      * Entropy source tests
 302      */
 303
 304     /* Test entropy source failure detecion: i.e. returns no data */
 305     t.entropylen = 0;
 306     if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0))
 307         goto err;
 308
 309     /* Try to generate output from uninstantiated DRBG */
 310     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 311                                        td->adin, td->adinlen))
 312             || !uninstantiate(drbg))
 313         goto err;
 314
 315     /* Test insufficient entropy */
 316     t.entropylen = drbg->min_entropylen - 1;
 317     if (!init(drbg, td, &t)
 318             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 319             || !uninstantiate(drbg))
 320         goto err;
 321
 322     /* Test too much entropy */
 323     t.entropylen = drbg->max_entropylen + 1;
 324     if (!init(drbg, td, &t)
 325             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 326             || !uninstantiate(drbg))
 327         goto err;
 328
 329     /*
 330      * Nonce tests
 331      */
 332
 333     /* Test too small nonce */
 334     if (drbg->min_noncelen) {
 335         t.noncelen = drbg->min_noncelen - 1;
 336         if (!init(drbg, td, &t)
 337                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 338                 || !uninstantiate(drbg))
 339             goto err;
 340     }
 341
 342     /* Test too large nonce */
 343     if (drbg->max_noncelen) {
 344         t.noncelen = drbg->max_noncelen + 1;
 345         if (!init(drbg, td, &t)
 346                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 347                 || !uninstantiate(drbg))
 348             goto err;
 349     }
 350
 351     /* Instantiate with valid data, Check generation is now OK */
 352     if (!instantiate(drbg, td, &t)
 353             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 354                                              td->adin, td->adinlen)))
 355         goto err;
 356
 357     /* Request too much data for one request */
 358     if (!TEST_false(RAND_DRBG_generate(drbg, buff, drbg->max_request + 1, 0,
 359                                        td->adin, td->adinlen)))
 360         goto err;
 361
 362     /* Try too large additional input */
 363     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 364                                        td->adin, drbg->max_adinlen + 1)))
 365         goto err;
 366
 367     /*
 368      * Check prediction resistance request fails if entropy source
 369      * failure.
 370      */
 371     t.entropylen = 0;
 372     if (TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 373                                       td->adin, td->adinlen))
 374             || !uninstantiate(drbg))
 375         goto err;
 376
 377     /* Instantiate again with valid data */
 378     if (!instantiate(drbg, td, &t))
 379         goto err;
 380     generate_counter_tmp = drbg->generate_counter;
 381     drbg->generate_counter = drbg->reseed_interval;
 382
 383     /* Generate output and check entropy has been requested for reseed */
 384     t.entropycnt = 0;
 385     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 386                                       td->adin, td->adinlen))
 387             || !TEST_int_eq(t.entropycnt, 1)
 388             || !TEST_int_eq(drbg->generate_counter, generate_counter_tmp + 1)
 389             || !uninstantiate(drbg))
 390         goto err;
 391
 392     /*
 393      * Check prediction resistance request fails if entropy source
 394      * failure.
 395      */
 396     t.entropylen = 0;
 397     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 398                                        td->adin, td->adinlen))
 399             || !uninstantiate(drbg))
 400         goto err;
 401
 402     /* Test reseed counter works */
 403     if (!instantiate(drbg, td, &t))
 404         goto err;
 405     generate_counter_tmp = drbg->generate_counter;
 406     drbg->generate_counter = drbg->reseed_interval;
 407
 408     /* Generate output and check entropy has been requested for reseed */
 409     t.entropycnt = 0;
 410     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 411                                       td->adin, td->adinlen))
 412             || !TEST_int_eq(t.entropycnt, 1)
 413             || !TEST_int_eq(drbg->generate_counter, generate_counter_tmp + 1)
 414             || !uninstantiate(drbg))
 415         goto err;
 416
 417     /*
 418      * Explicit reseed tests
 419      */
 420
 421     /* Test explicit reseed with too large additional input */
 422     if (!init(drbg, td, &t)
 423             || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1, 0) > 0)
 424         goto err;
 425
 426     /* Test explicit reseed with entropy source failure */
 427     t.entropylen = 0;
 428     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 429             || !uninstantiate(drbg))
 430         goto err;
 431
 432     /* Test explicit reseed with too much entropy */
 433     if (!init(drbg, td, &t))
 434         goto err;
 435     t.entropylen = drbg->max_entropylen + 1;
 436     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 437             || !uninstantiate(drbg))
 438         goto err;
 439
 440     /* Test explicit reseed with too little entropy */
 441     if (!init(drbg, td, &t))
 442         goto err;
 443     t.entropylen = drbg->min_entropylen - 1;
 444     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 445             || !uninstantiate(drbg))
 446         goto err;
 447
 448     /* Standard says we have to check uninstantiate really zeroes */
 449     if (!TEST_mem_eq(zero, sizeof(drbg->data), &drbg->data, sizeof(drbg->data)))
 450         goto err;
 451
 452     ret = 1;
 453
 454 err:
 455     uninstantiate(drbg);
 456     RAND_DRBG_free(drbg);
 457     return ret;
 458 }
 459
 460 static int test_kats(int i)
 461 {
 462     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 463     int rv = 0;
 464
 465     if (!single_kat(td))
 466         goto err;
 467     rv = 1;
 468
 469 err:
 470     return rv;
 471 }
 472
 473 static int test_error_checks(int i)
 474 {
 475     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 476     int rv = 0;
 477
 478     if (error_check(td))
 479         goto err;
 480     rv = 1;
 481
 482 err:
 483     return rv;
 484 }
 485
 486 /*
 487  * Hook context data, attached as EXDATA to the RAND_DRBG
 488  */
 489 typedef struct hook_ctx_st {
 490     RAND_DRBG *drbg;
 491     /*
 492      * Currently, all DRBGs use the same get_entropy() callback.
 493      * The tests however, don't assume this and store
 494      * the original callback for every DRBG separately.
 495      */
 496     RAND_DRBG_get_entropy_fn get_entropy;
 497     /* forces a failure of the get_entropy() call if nonzero */
 498     int fail;
 499     /* counts successful reseeds */
 500     int reseed_count;
 501 } HOOK_CTX;
 502
 503 static HOOK_CTX master_ctx, public_ctx, private_ctx;
 504
 505 static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
 506 {
 507     return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 508 }
 509
 510 /* Intercepts and counts calls to the get_entropy() callback */
 511 static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout,
 512                               int entropy, size_t min_len, size_t max_len,
 513                               int prediction_resistance)
 514 {
 515     size_t ret;
 516     HOOK_CTX *ctx = get_hook_ctx(drbg);
 517
 518     if (ctx->fail != 0)
 519         return 0;
 520
 521     ret = ctx->get_entropy(drbg, pout, entropy, min_len, max_len,
 522                            prediction_resistance);
 523
 524     if (ret != 0)
 525         ctx->reseed_count++;
 526     return ret;
 527 }
 528
 529 /* Installs a hook for the get_entropy() callback of the given drbg */
 530 static void hook_drbg(RAND_DRBG *drbg, HOOK_CTX *ctx)
 531 {
 532     memset(ctx, 0, sizeof(*ctx));
 533     ctx->drbg = drbg;
 534     ctx->get_entropy = drbg->get_entropy;
 535     drbg->get_entropy = get_entropy_hook;
 536     RAND_DRBG_set_ex_data(drbg, app_data_index, ctx);
 537 }
 538
 539 /* Installs the hook for the get_entropy() callback of the given drbg */
 540 static void unhook_drbg(RAND_DRBG *drbg)
 541 {
 542     HOOK_CTX *ctx = get_hook_ctx(drbg);
 543
 544     drbg->get_entropy = ctx->get_entropy;
 545     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data);
 546 }
 547
 548 /* Resets the given hook context */
 549 static void reset_hook_ctx(HOOK_CTX *ctx)
 550 {
 551     ctx->fail = 0;
 552     ctx->reseed_count = 0;
 553 }
 554
 555 /* Resets all drbg hook contexts */
 556 static void reset_drbg_hook_ctx()
 557 {
 558     reset_hook_ctx(&master_ctx);
 559     reset_hook_ctx(&public_ctx);
 560     reset_hook_ctx(&private_ctx);
 561 }
 562
 563 /*
 564  * Generates random output using RAND_bytes() and RAND_priv_bytes()
 565  * and checks whether the three shared DRBGs were reseeded as
 566  * expected.
 567  *
 568  * |expect_success|: expected outcome (as reported by RAND_status())
 569  * |master|, |public|, |private|: pointers to the three shared DRBGs
 570  * |expect_xxx_reseed| =
 571  *       1:  it is expected that the specified DRBG is reseeded
 572  *       0:  it is expected that the specified DRBG is not reseeded
 573  *      -1:  don't check whether the specified DRBG was reseeded or not
 574  */
 575 static int test_drbg_reseed(int expect_success,
 576                             RAND_DRBG *master,
 577                             RAND_DRBG *public,
 578                             RAND_DRBG *private,
 579                             int expect_master_reseed,
 580                             int expect_public_reseed,
 581                             int expect_private_reseed
 582                            )
 583 {
 584     unsigned char buf[32];
 585     time_t before_reseed, after_reseed;
 586     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
 587
 588     /*
 589      * step 1: check preconditions
 590      */
 591
 592     /* Test whether seed propagation is enabled */
 593     if (!TEST_int_ne(master->reseed_counter, 0)
 594         || !TEST_int_ne(public->reseed_counter, 0)
 595         || !TEST_int_ne(private->reseed_counter, 0))
 596         return 0;
 597
 598     /* Check whether the master DRBG's reseed counter is the largest one */
 599     if (!TEST_int_le(public->reseed_counter, master->reseed_counter)
 600         || !TEST_int_le(private->reseed_counter, master->reseed_counter))
 601         return 0;
 602
 603     /*
 604      * step 2: generate random output
 605      */
 606
 607     /* Generate random output from the public and private DRBG */
 608     before_reseed = expect_master_reseed == 1 ? time(NULL) : 0;
 609     if (!TEST_int_eq(RAND_bytes(buf, sizeof(buf)), expect_success)
 610         || !TEST_int_eq(RAND_priv_bytes(buf, sizeof(buf)), expect_success))
 611         return 0;
 612     after_reseed = time(NULL);
 613
 614
 615     /*
 616      * step 3: check postconditions
 617      */
 618
 619     /* Test whether reseeding succeeded as expected */
 620     if (!TEST_int_eq(master->state, expected_state)
 621         || !TEST_int_eq(public->state, expected_state)
 622         || !TEST_int_eq(private->state, expected_state))
 623         return 0;
 624
 625     if (expect_master_reseed >= 0) {
 626         /* Test whether master DRBG was reseeded as expected */
 627         if (!TEST_int_eq(master_ctx.reseed_count, expect_master_reseed))
 628             return 0;
 629     }
 630
 631     if (expect_public_reseed >= 0) {
 632         /* Test whether public DRBG was reseeded as expected */
 633         if (!TEST_int_eq(public_ctx.reseed_count, expect_public_reseed))
 634             return 0;
 635     }
 636
 637     if (expect_private_reseed >= 0) {
 638         /* Test whether public DRBG was reseeded as expected */
 639         if (!TEST_int_eq(private_ctx.reseed_count, expect_private_reseed))
 640             return 0;
 641     }
 642
 643     if (expect_success == 1) {
 644         /* Test whether all three reseed counters are synchronized */
 645         if (!TEST_int_eq(public->reseed_counter, master->reseed_counter)
 646             || !TEST_int_eq(private->reseed_counter, master->reseed_counter))
 647             return 0;
 648
 649         /* Test whether reseed time of master DRBG is set correctly */
 650         if (!TEST_time_t_le(before_reseed, master->reseed_time)
 651             || !TEST_time_t_le(master->reseed_time, after_reseed))
 652             return 0;
 653
 654         /* Test whether reseed times of child DRBGs are synchronized with master */
 655         if (!TEST_time_t_ge(public->reseed_time, master->reseed_time)
 656             || !TEST_time_t_ge(private->reseed_time, master->reseed_time))
 657             return 0;
 658     } else {
 659         ERR_clear_error();
 660     }
 661
 662     return 1;
 663 }
 664
 665 /*
 666  * Test whether the default rand_method (RAND_OpenSSL()) is
 667  * setup correctly, in particular whether reseeding  works
 668  * as designed.
 669  */
 670 static int test_rand_reseed(void)
 671 {
 672     RAND_DRBG *master, *public, *private;
 673     unsigned char rand_add_buf[256];
 674     int rv=0;
 675
 676     /* Check whether RAND_OpenSSL() is the default method */
 677     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
 678         return 0;
 679
 680     /* All three DRBGs should be non-null */
 681     if (!TEST_ptr(master = RAND_DRBG_get0_master())
 682         || !TEST_ptr(public = RAND_DRBG_get0_public())
 683         || !TEST_ptr(private = RAND_DRBG_get0_private()))
 684         return 0;
 685
 686     /* There should be three distinct DRBGs, two of them chained to master */
 687     if (!TEST_ptr_ne(public, private)
 688         || !TEST_ptr_ne(public, master)
 689         || !TEST_ptr_ne(private, master)
 690         || !TEST_ptr_eq(public->parent, master)
 691         || !TEST_ptr_eq(private->parent, master))
 692         return 0;
 693
 694     /* uninstantiate the three global DRBGs */
 695     RAND_DRBG_uninstantiate(private);
 696     RAND_DRBG_uninstantiate(public);
 697     RAND_DRBG_uninstantiate(master);
 698
 699
 700     /* Install hooks for the following tests */
 701     hook_drbg(master,  &master_ctx);
 702     hook_drbg(public,  &public_ctx);
 703     hook_drbg(private, &private_ctx);
 704
 705
 706     /*
 707      * Test initial seeding of shared DRBGs
 708      */
 709     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1)))
 710         goto error;
 711     reset_drbg_hook_ctx();
 712
 713
 714     /*
 715      * Test initial state of shared DRBGs
 716      */
 717     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 0)))
 718         goto error;
 719     reset_drbg_hook_ctx();
 720
 721     /*
 722      * Test whether the public and private DRBG are both reseeded when their
 723      * reseed counters differ from the master's reseed counter.
 724      */
 725     master->reseed_counter++;
 726     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 1)))
 727         goto error;
 728     reset_drbg_hook_ctx();
 729
 730     /*
 731      * Test whether the public DRBG is reseeded when its reseed counter differs
 732      * from the master's reseed counter.
 733      */
 734     master->reseed_counter++;
 735     private->reseed_counter++;
 736     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 0)))
 737         goto error;
 738     reset_drbg_hook_ctx();
 739
 740     /*
 741      * Test whether the private DRBG is reseeded when its reseed counter differs
 742      * from the master's reseed counter.
 743      */
 744     master->reseed_counter++;
 745     public->reseed_counter++;
 746     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 1)))
 747         goto error;
 748     reset_drbg_hook_ctx();
 749
 750
 751     /* fill 'randomness' buffer with some arbitrary data */
 752     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
 753
 754     /*
 755      * Test whether all three DRBGs are reseeded by RAND_add()
 756      */
 757     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 758     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1)))
 759         goto error;
 760     reset_drbg_hook_ctx();
 761
 762
 763     /*
 764      * Test whether none of the DRBGs is reseed if the master fails to reseed
 765      */
 766     master_ctx.fail = 1;
 767     master->reseed_counter++;
 768     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 769     if (!TEST_true(test_drbg_reseed(0, master, public, private, 0, 0, 0)))
 770         goto error;
 771     reset_drbg_hook_ctx();
 772
 773     rv = 1;
 774
 775 error:
 776     /* Remove hooks  */
 777     unhook_drbg(master);
 778     unhook_drbg(public);
 779     unhook_drbg(private);
 780
 781     return rv;
 782 }
 783
 784 #if defined(OPENSSL_THREADS)
 785
 786 static void run_multi_thread_test(void)
 787 {
 788     unsigned char buf[256];
 789     time_t start = time(NULL);
 790     RAND_DRBG *public, *private;
 791
 792     public = RAND_DRBG_get0_public();
 793     private = RAND_DRBG_get0_private();
 794     RAND_DRBG_set_reseed_time_interval(public, 1);
 795     RAND_DRBG_set_reseed_time_interval(private, 1);
 796
 797     do {
 798         RAND_bytes(buf, sizeof(buf));
 799         RAND_priv_bytes(buf, sizeof(buf));
 800     }
 801     while(time(NULL) - start < 5);
 802 }
 803
 804 # if defined(OPENSSL_SYS_WINDOWS)
 805
 806 typedef HANDLE thread_t;
 807
 808 static DWORD WINAPI thread_run(LPVOID arg)
 809 {
 810     run_multi_thread_test();
 811     return 0;
 812 }
 813
 814 static int run_thread(thread_t *t)
 815 {
 816     *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL);
 817     return *t != NULL;
 818 }
 819
 820 static int wait_for_thread(thread_t thread)
 821 {
 822     return WaitForSingleObject(thread, INFINITE) == 0;
 823 }
 824
 825 # else
 826
 827 typedef pthread_t thread_t;
 828
 829 static void *thread_run(void *arg)
 830 {
 831     run_multi_thread_test();
 832     return NULL;
 833 }
 834
 835 static int run_thread(thread_t *t)
 836 {
 837     return pthread_create(t, NULL, thread_run, NULL) == 0;
 838 }
 839
 840 static int wait_for_thread(thread_t thread)
 841 {
 842     return pthread_join(thread, NULL) == 0;
 843 }
 844
 845 # endif
 846
 847 /*
 848  * The main thread will also run the test, so we'll have THREADS+1 parallel
 849  * tests running
 850  */
 851 #define THREADS 3
 852
 853 static int test_multi_thread(void)
 854 {
 855     thread_t t[THREADS];
 856     int i;
 857
 858     for (i = 0; i < THREADS; i++)
 859         run_thread(&t[i]);
 860     run_multi_thread_test();
 861     for (i = 0; i < THREADS; i++)
 862         wait_for_thread(t[i]);
 863     return 1;
 864 }
 865 #endif
 866
 867 int setup_tests(void)
 868 {
 869     app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
 870
 871     ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test));
 872     ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test));
 873     ADD_TEST(test_rand_reseed);
 874 #if defined(OPENSSL_THREADS)
 875     ADD_TEST(test_multi_thread);
 876 #endif
 877     return 1;
 878 }