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 #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 static DRBG_SELFTEST_DATA drbg_test[] = {
 103     make_drbg_test_data_no_df (NID_aes_128_ctr, aes_128_no_df,  0),
 104     make_drbg_test_data_no_df (NID_aes_192_ctr, aes_192_no_df,  0),
 105     make_drbg_test_data_no_df (NID_aes_256_ctr, aes_256_no_df,  1),
 106     make_drbg_test_data_use_df(NID_aes_128_ctr, aes_128_use_df, 0),
 107     make_drbg_test_data_use_df(NID_aes_192_ctr, aes_192_use_df, 0),
 108     make_drbg_test_data_use_df(NID_aes_256_ctr, aes_256_use_df, 1),
 109 };
 110
 111 static int app_data_index;
 112
 113 /*
 114  * Test context data, attached as EXDATA to the RAND_DRBG
 115  */
 116 typedef struct test_ctx_st {
 117     const unsigned char *entropy;
 118     size_t entropylen;
 119     int entropycnt;
 120     const unsigned char *nonce;
 121     size_t noncelen;
 122     int noncecnt;
 123 } TEST_CTX;
 124
 125 static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
 126                           int entropy, size_t min_len, size_t max_len,
 127                           int prediction_resistance)
 128 {
 129     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 130
 131     t->entropycnt++;
 132     *pout = (unsigned char *)t->entropy;
 133     return t->entropylen;
 134 }
 135
 136 static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout,
 137                         int entropy, size_t min_len, size_t max_len)
 138 {
 139     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 140
 141     t->noncecnt++;
 142     *pout = (unsigned char *)t->nonce;
 143     return t->noncelen;
 144 }
 145
 146 static int uninstantiate(RAND_DRBG *drbg)
 147 {
 148     int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
 149
 150     ERR_clear_error();
 151     return ret;
 152 }
 153
 154 /*
 155  * Do a single KAT test.  Return 0 on failure.
 156  */
 157 static int single_kat(DRBG_SELFTEST_DATA *td)
 158 {
 159     RAND_DRBG *drbg = NULL;
 160     TEST_CTX t;
 161     int failures = 0;
 162     unsigned char buff[1024];
 163
 164     /*
 165      * Test without PR: Instantiate DRBG with test entropy, nonce and
 166      * personalisation string.
 167      */
 168     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
 169         return 0;
 170     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 171                                            kat_nonce, NULL))) {
 172         failures++;
 173         goto err;
 174     }
 175     memset(&t, 0, sizeof(t));
 176     t.entropy = td->entropy;
 177     t.entropylen = td->entropylen;
 178     t.nonce = td->nonce;
 179     t.noncelen = td->noncelen;
 180     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 181
 182     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))
 183             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 184                                              td->adin, td->adinlen))
 185             || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen))
 186         failures++;
 187
 188     /* Reseed DRBG with test entropy and additional input */
 189     t.entropy = td->entropyreseed;
 190     t.entropylen = td->entropyreseedlen;
 191     if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen, 0)
 192             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0,
 193                                              td->adin2, td->adin2len))
 194             || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len)))
 195         failures++;
 196     uninstantiate(drbg);
 197
 198     /*
 199      * Now test with PR: Instantiate DRBG with test entropy, nonce and
 200      * personalisation string.
 201      */
 202     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 203             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 204                                                   kat_nonce, NULL)))
 205         failures++;
 206     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 207     t.entropy = td->entropy_pr;
 208     t.entropylen = td->entropylen_pr;
 209     t.nonce = td->nonce_pr;
 210     t.noncelen = td->noncelen_pr;
 211     t.entropycnt = 0;
 212     t.noncecnt = 0;
 213     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr)))
 214         failures++;
 215
 216     /*
 217      * Now generate with PR: we need to supply entropy as this will
 218      * perform a reseed operation.
 219      */
 220     t.entropy = td->entropypr_pr;
 221     t.entropylen = td->entropyprlen_pr;
 222     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1,
 223                                       td->adin_pr, td->adinlen_pr))
 224             || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr))
 225         failures++;
 226
 227     /*
 228      * Now generate again with PR: supply new entropy again.
 229      */
 230     t.entropy = td->entropyg_pr;
 231     t.entropylen = td->entropyglen_pr;
 232
 233     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1,
 234                                       td->ading_pr, td->adinglen_pr))
 235                 || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr,
 236                                 buff, td->kat2len_pr))
 237         failures++;
 238
 239 err:
 240     uninstantiate(drbg);
 241     RAND_DRBG_free(drbg);
 242     return failures == 0;
 243 }
 244
 245 /*
 246  * Initialise a DRBG based on selftest data
 247  */
 248 static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t)
 249 {
 250     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 251             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 252                                                   kat_nonce, NULL)))
 253         return 0;
 254     RAND_DRBG_set_ex_data(drbg, app_data_index, t);
 255     t->entropy = td->entropy;
 256     t->entropylen = td->entropylen;
 257     t->nonce = td->nonce;
 258     t->noncelen = td->noncelen;
 259     t->entropycnt = 0;
 260     t->noncecnt = 0;
 261     return 1;
 262 }
 263
 264 /*
 265  * Initialise and instantiate DRBG based on selftest data
 266  */
 267 static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td,
 268                        TEST_CTX *t)
 269 {
 270     if (!TEST_true(init(drbg, td, t))
 271             || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)))
 272         return 0;
 273     return 1;
 274 }
 275
 276 /*
 277  * Perform extensive error checking as required by SP800-90.
 278  * Induce several failure modes and check an error condition is set.
 279  */
 280 static int error_check(DRBG_SELFTEST_DATA *td)
 281 {
 282     static char zero[sizeof(RAND_DRBG)];
 283     RAND_DRBG *drbg = NULL;
 284     TEST_CTX t;
 285     unsigned char buff[1024];
 286     unsigned int reseed_counter_tmp;
 287     int ret = 0;
 288
 289     if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)))
 290         goto err;
 291
 292     /*
 293      * Personalisation string tests
 294      */
 295
 296     /* Test detection of too large personlisation string */
 297     if (!init(drbg, td, &t)
 298             || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0)
 299         goto err;
 300
 301     /*
 302      * Entropy source tests
 303      */
 304
 305     /* Test entropy source failure detection: i.e. returns no data */
 306     t.entropylen = 0;
 307     if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0))
 308         goto err;
 309
 310     /* Try to generate output from uninstantiated DRBG */
 311     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 312                                        td->adin, td->adinlen))
 313             || !uninstantiate(drbg))
 314         goto err;
 315
 316     /* Test insufficient entropy */
 317     t.entropylen = drbg->min_entropylen - 1;
 318     if (!init(drbg, td, &t)
 319             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 320             || !uninstantiate(drbg))
 321         goto err;
 322
 323     /* Test too much entropy */
 324     t.entropylen = drbg->max_entropylen + 1;
 325     if (!init(drbg, td, &t)
 326             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 327             || !uninstantiate(drbg))
 328         goto err;
 329
 330     /*
 331      * Nonce tests
 332      */
 333
 334     /* Test too small nonce */
 335     if (drbg->min_noncelen) {
 336         t.noncelen = drbg->min_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     /* Test too large nonce */
 344     if (drbg->max_noncelen) {
 345         t.noncelen = drbg->max_noncelen + 1;
 346         if (!init(drbg, td, &t)
 347                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 348                 || !uninstantiate(drbg))
 349             goto err;
 350     }
 351
 352     /* Instantiate with valid data, Check generation is now OK */
 353     if (!instantiate(drbg, td, &t)
 354             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 355                                              td->adin, td->adinlen)))
 356         goto err;
 357
 358     /* Request too much data for one request */
 359     if (!TEST_false(RAND_DRBG_generate(drbg, buff, drbg->max_request + 1, 0,
 360                                        td->adin, td->adinlen)))
 361         goto err;
 362
 363     /* Try too large additional input */
 364     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 365                                        td->adin, drbg->max_adinlen + 1)))
 366         goto err;
 367
 368     /*
 369      * Check prediction resistance request fails if entropy source
 370      * failure.
 371      */
 372     t.entropylen = 0;
 373     if (TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 374                                       td->adin, td->adinlen))
 375             || !uninstantiate(drbg))
 376         goto err;
 377
 378     /* Instantiate again with valid data */
 379     if (!instantiate(drbg, td, &t))
 380         goto err;
 381     reseed_counter_tmp = drbg->reseed_gen_counter;
 382     drbg->reseed_gen_counter = drbg->reseed_interval;
 383
 384     /* Generate output and check entropy has been requested for reseed */
 385     t.entropycnt = 0;
 386     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 387                                       td->adin, td->adinlen))
 388             || !TEST_int_eq(t.entropycnt, 1)
 389             || !TEST_int_eq(drbg->reseed_gen_counter, reseed_counter_tmp + 1)
 390             || !uninstantiate(drbg))
 391         goto err;
 392
 393     /*
 394      * Check prediction resistance request fails if entropy source
 395      * failure.
 396      */
 397     t.entropylen = 0;
 398     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 399                                        td->adin, td->adinlen))
 400             || !uninstantiate(drbg))
 401         goto err;
 402
 403     /* Test reseed counter works */
 404     if (!instantiate(drbg, td, &t))
 405         goto err;
 406     reseed_counter_tmp = drbg->reseed_gen_counter;
 407     drbg->reseed_gen_counter = drbg->reseed_interval;
 408
 409     /* Generate output and check entropy has been requested for reseed */
 410     t.entropycnt = 0;
 411     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 412                                       td->adin, td->adinlen))
 413             || !TEST_int_eq(t.entropycnt, 1)
 414             || !TEST_int_eq(drbg->reseed_gen_counter, reseed_counter_tmp + 1)
 415             || !uninstantiate(drbg))
 416         goto err;
 417
 418     /*
 419      * Explicit reseed tests
 420      */
 421
 422     /* Test explicit reseed with too large additional input */
 423     if (!init(drbg, td, &t)
 424             || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1, 0) > 0)
 425         goto err;
 426
 427     /* Test explicit reseed with entropy source failure */
 428     t.entropylen = 0;
 429     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 430             || !uninstantiate(drbg))
 431         goto err;
 432
 433     /* Test explicit reseed with too much entropy */
 434     if (!init(drbg, td, &t))
 435         goto err;
 436     t.entropylen = drbg->max_entropylen + 1;
 437     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 438             || !uninstantiate(drbg))
 439         goto err;
 440
 441     /* Test explicit reseed with too little entropy */
 442     if (!init(drbg, td, &t))
 443         goto err;
 444     t.entropylen = drbg->min_entropylen - 1;
 445     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0)
 446             || !uninstantiate(drbg))
 447         goto err;
 448
 449     /* Standard says we have to check uninstantiate really zeroes */
 450     if (!TEST_mem_eq(zero, sizeof(drbg->data), &drbg->data, sizeof(drbg->data)))
 451         goto err;
 452
 453     ret = 1;
 454
 455 err:
 456     uninstantiate(drbg);
 457     RAND_DRBG_free(drbg);
 458     return ret;
 459 }
 460
 461 static int test_kats(int i)
 462 {
 463     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 464     int rv = 0;
 465
 466     if (!single_kat(td))
 467         goto err;
 468     rv = 1;
 469
 470 err:
 471     return rv;
 472 }
 473
 474 static int test_error_checks(int i)
 475 {
 476     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 477     int rv = 0;
 478
 479     if (error_check(td))
 480         goto err;
 481     rv = 1;
 482
 483 err:
 484     return rv;
 485 }
 486
 487 /*
 488  * Hook context data, attached as EXDATA to the RAND_DRBG
 489  */
 490 typedef struct hook_ctx_st {
 491     RAND_DRBG *drbg;
 492     /*
 493      * Currently, all DRBGs use the same get_entropy() callback.
 494      * The tests however, don't assume this and store
 495      * the original callback for every DRBG separately.
 496      */
 497     RAND_DRBG_get_entropy_fn get_entropy;
 498     /* forces a failure of the get_entropy() call if nonzero */
 499     int fail;
 500     /* counts successful reseeds */
 501     int reseed_count;
 502 } HOOK_CTX;
 503
 504 static HOOK_CTX master_ctx, public_ctx, private_ctx;
 505
 506 static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg)
 507 {
 508     return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 509 }
 510
 511 /* Intercepts and counts calls to the get_entropy() callback */
 512 static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout,
 513                               int entropy, size_t min_len, size_t max_len,
 514                               int prediction_resistance)
 515 {
 516     size_t ret;
 517     HOOK_CTX *ctx = get_hook_ctx(drbg);
 518
 519     if (ctx->fail != 0)
 520         return 0;
 521
 522     ret = ctx->get_entropy(drbg, pout, entropy, min_len, max_len,
 523                            prediction_resistance);
 524
 525     if (ret != 0)
 526         ctx->reseed_count++;
 527     return ret;
 528 }
 529
 530 /* Installs a hook for the get_entropy() callback of the given drbg */
 531 static void hook_drbg(RAND_DRBG *drbg, HOOK_CTX *ctx)
 532 {
 533     memset(ctx, 0, sizeof(*ctx));
 534     ctx->drbg = drbg;
 535     ctx->get_entropy = drbg->get_entropy;
 536     drbg->get_entropy = get_entropy_hook;
 537     RAND_DRBG_set_ex_data(drbg, app_data_index, ctx);
 538 }
 539
 540 /* Installs the hook for the get_entropy() callback of the given drbg */
 541 static void unhook_drbg(RAND_DRBG *drbg)
 542 {
 543     HOOK_CTX *ctx = get_hook_ctx(drbg);
 544
 545     drbg->get_entropy = ctx->get_entropy;
 546     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data);
 547 }
 548
 549 /* Resets the given hook context */
 550 static void reset_hook_ctx(HOOK_CTX *ctx)
 551 {
 552     ctx->fail = 0;
 553     ctx->reseed_count = 0;
 554 }
 555
 556 /* Resets all drbg hook contexts */
 557 static void reset_drbg_hook_ctx(void)
 558 {
 559     reset_hook_ctx(&master_ctx);
 560     reset_hook_ctx(&public_ctx);
 561     reset_hook_ctx(&private_ctx);
 562 }
 563
 564 /*
 565  * Generates random output using RAND_bytes() and RAND_priv_bytes()
 566  * and checks whether the three shared DRBGs were reseeded as
 567  * expected.
 568  *
 569  * |expect_success|: expected outcome (as reported by RAND_status())
 570  * |master|, |public|, |private|: pointers to the three shared DRBGs
 571  * |expect_xxx_reseed| =
 572  *       1:  it is expected that the specified DRBG is reseeded
 573  *       0:  it is expected that the specified DRBG is not reseeded
 574  *      -1:  don't check whether the specified DRBG was reseeded or not
 575  * |reseed_time|: if nonzero, used instead of time(NULL) to set the
 576  *                |before_reseed| time.
 577  */
 578 static int test_drbg_reseed(int expect_success,
 579                             RAND_DRBG *master,
 580                             RAND_DRBG *public,
 581                             RAND_DRBG *private,
 582                             int expect_master_reseed,
 583                             int expect_public_reseed,
 584                             int expect_private_reseed,
 585                             time_t reseed_time
 586                            )
 587 {
 588     unsigned char buf[32];
 589     time_t before_reseed, after_reseed;
 590     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
 591
 592     /*
 593      * step 1: check preconditions
 594      */
 595
 596     /* Test whether seed propagation is enabled */
 597     if (!TEST_int_ne(master->reseed_prop_counter, 0)
 598         || !TEST_int_ne(public->reseed_prop_counter, 0)
 599         || !TEST_int_ne(private->reseed_prop_counter, 0))
 600         return 0;
 601
 602     /* Check whether the master DRBG's reseed counter is the largest one */
 603     if (!TEST_int_le(public->reseed_prop_counter, master->reseed_prop_counter)
 604         || !TEST_int_le(private->reseed_prop_counter, master->reseed_prop_counter))
 605         return 0;
 606
 607     /*
 608      * step 2: generate random output
 609      */
 610
 611     if (reseed_time == 0)
 612         reseed_time = time(NULL);
 613
 614     /* Generate random output from the public and private DRBG */
 615     before_reseed = expect_master_reseed == 1 ? reseed_time : 0;
 616     if (!TEST_int_eq(RAND_bytes(buf, sizeof(buf)), expect_success)
 617         || !TEST_int_eq(RAND_priv_bytes(buf, sizeof(buf)), expect_success))
 618         return 0;
 619     after_reseed = time(NULL);
 620
 621
 622     /*
 623      * step 3: check postconditions
 624      */
 625
 626     /* Test whether reseeding succeeded as expected */
 627     if (!TEST_int_eq(master->state, expected_state)
 628         || !TEST_int_eq(public->state, expected_state)
 629         || !TEST_int_eq(private->state, expected_state))
 630         return 0;
 631
 632     if (expect_master_reseed >= 0) {
 633         /* Test whether master DRBG was reseeded as expected */
 634         if (!TEST_int_eq(master_ctx.reseed_count, expect_master_reseed))
 635             return 0;
 636     }
 637
 638     if (expect_public_reseed >= 0) {
 639         /* Test whether public DRBG was reseeded as expected */
 640         if (!TEST_int_eq(public_ctx.reseed_count, expect_public_reseed))
 641             return 0;
 642     }
 643
 644     if (expect_private_reseed >= 0) {
 645         /* Test whether public DRBG was reseeded as expected */
 646         if (!TEST_int_eq(private_ctx.reseed_count, expect_private_reseed))
 647             return 0;
 648     }
 649
 650     if (expect_success == 1) {
 651         /* Test whether all three reseed counters are synchronized */
 652         if (!TEST_int_eq(public->reseed_prop_counter, master->reseed_prop_counter)
 653             || !TEST_int_eq(private->reseed_prop_counter, master->reseed_prop_counter))
 654             return 0;
 655
 656         /* Test whether reseed time of master DRBG is set correctly */
 657         if (!TEST_time_t_le(before_reseed, master->reseed_time)
 658             || !TEST_time_t_le(master->reseed_time, after_reseed))
 659             return 0;
 660
 661         /* Test whether reseed times of child DRBGs are synchronized with master */
 662         if (!TEST_time_t_ge(public->reseed_time, master->reseed_time)
 663             || !TEST_time_t_ge(private->reseed_time, master->reseed_time))
 664             return 0;
 665     } else {
 666         ERR_clear_error();
 667     }
 668
 669     return 1;
 670 }
 671
 672 /*
 673  * Test whether the default rand_method (RAND_OpenSSL()) is
 674  * setup correctly, in particular whether reseeding  works
 675  * as designed.
 676  */
 677 static int test_rand_drbg_reseed(void)
 678 {
 679     RAND_DRBG *master, *public, *private;
 680     unsigned char rand_add_buf[256];
 681     int rv=0;
 682     time_t before_reseed;
 683
 684     /* Check whether RAND_OpenSSL() is the default method */
 685     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
 686         return 0;
 687
 688     /* All three DRBGs should be non-null */
 689     if (!TEST_ptr(master = RAND_DRBG_get0_master())
 690         || !TEST_ptr(public = RAND_DRBG_get0_public())
 691         || !TEST_ptr(private = RAND_DRBG_get0_private()))
 692         return 0;
 693
 694     /* There should be three distinct DRBGs, two of them chained to master */
 695     if (!TEST_ptr_ne(public, private)
 696         || !TEST_ptr_ne(public, master)
 697         || !TEST_ptr_ne(private, master)
 698         || !TEST_ptr_eq(public->parent, master)
 699         || !TEST_ptr_eq(private->parent, master))
 700         return 0;
 701
 702     /* uninstantiate the three global DRBGs */
 703     RAND_DRBG_uninstantiate(private);
 704     RAND_DRBG_uninstantiate(public);
 705     RAND_DRBG_uninstantiate(master);
 706
 707
 708     /* Install hooks for the following tests */
 709     hook_drbg(master,  &master_ctx);
 710     hook_drbg(public,  &public_ctx);
 711     hook_drbg(private, &private_ctx);
 712
 713
 714     /*
 715      * Test initial seeding of shared DRBGs
 716      */
 717     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1, 0)))
 718         goto error;
 719     reset_drbg_hook_ctx();
 720
 721
 722     /*
 723      * Test initial state of shared DRBGs
 724      */
 725     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 0, 0)))
 726         goto error;
 727     reset_drbg_hook_ctx();
 728
 729     /*
 730      * Test whether the public and private DRBG are both reseeded when their
 731      * reseed counters differ from the master's reseed counter.
 732      */
 733     master->reseed_prop_counter++;
 734     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 1, 0)))
 735         goto error;
 736     reset_drbg_hook_ctx();
 737
 738     /*
 739      * Test whether the public DRBG is reseeded when its reseed counter differs
 740      * from the master's reseed counter.
 741      */
 742     master->reseed_prop_counter++;
 743     private->reseed_prop_counter++;
 744     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 0, 0)))
 745         goto error;
 746     reset_drbg_hook_ctx();
 747
 748     /*
 749      * Test whether the private DRBG is reseeded when its reseed counter differs
 750      * from the master's reseed counter.
 751      */
 752     master->reseed_prop_counter++;
 753     public->reseed_prop_counter++;
 754     if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 1, 0)))
 755         goto error;
 756     reset_drbg_hook_ctx();
 757
 758
 759     /* fill 'randomness' buffer with some arbitrary data */
 760     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
 761
 762     /*
 763      * Test whether all three DRBGs are reseeded by RAND_add().
 764      * The before_reseed time has to be measured here and passed into the
 765      * test_drbg_reseed() test, because the master DRBG gets already reseeded
 766      * in RAND_add(), whence the check for the condition
 767      * before_reseed <= master->reseed_time will fail if the time value happens
 768      * to increase between the RAND_add() and the test_drbg_reseed() call.
 769      */
 770     before_reseed = time(NULL);
 771     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 772     if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1,
 773                                     before_reseed)))
 774         goto error;
 775     reset_drbg_hook_ctx();
 776
 777
 778     /*
 779      * Test whether none of the DRBGs is reseed if the master fails to reseed
 780      */
 781     master_ctx.fail = 1;
 782     master->reseed_prop_counter++;
 783     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 784     if (!TEST_true(test_drbg_reseed(0, master, public, private, 0, 0, 0, 0)))
 785         goto error;
 786     reset_drbg_hook_ctx();
 787
 788     rv = 1;
 789
 790 error:
 791     /* Remove hooks  */
 792     unhook_drbg(master);
 793     unhook_drbg(public);
 794     unhook_drbg(private);
 795
 796     return rv;
 797 }
 798
 799 #if defined(OPENSSL_THREADS)
 800 static int multi_thread_rand_bytes_succeeded = 1;
 801 static int multi_thread_rand_priv_bytes_succeeded = 1;
 802
 803 static void run_multi_thread_test(void)
 804 {
 805     unsigned char buf[256];
 806     time_t start = time(NULL);
 807     RAND_DRBG *public = NULL, *private = NULL;
 808
 809     if (!TEST_ptr(public = RAND_DRBG_get0_public())
 810             || !TEST_ptr(private = RAND_DRBG_get0_private())) {
 811         multi_thread_rand_bytes_succeeded = 0;
 812         return;
 813     }
 814     RAND_DRBG_set_reseed_time_interval(private, 1);
 815     RAND_DRBG_set_reseed_time_interval(public, 1);
 816
 817     do {
 818         if (RAND_bytes(buf, sizeof(buf)) <= 0)
 819             multi_thread_rand_bytes_succeeded = 0;
 820         if (RAND_priv_bytes(buf, sizeof(buf)) <= 0)
 821             multi_thread_rand_priv_bytes_succeeded = 0;
 822     }
 823     while(time(NULL) - start < 5);
 824 }
 825
 826 # if defined(OPENSSL_SYS_WINDOWS)
 827
 828 typedef HANDLE thread_t;
 829
 830 static DWORD WINAPI thread_run(LPVOID arg)
 831 {
 832     run_multi_thread_test();
 833     return 0;
 834 }
 835
 836 static int run_thread(thread_t *t)
 837 {
 838     *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL);
 839     return *t != NULL;
 840 }
 841
 842 static int wait_for_thread(thread_t thread)
 843 {
 844     return WaitForSingleObject(thread, INFINITE) == 0;
 845 }
 846
 847 # else
 848
 849 typedef pthread_t thread_t;
 850
 851 static void *thread_run(void *arg)
 852 {
 853     run_multi_thread_test();
 854     return NULL;
 855 }
 856
 857 static int run_thread(thread_t *t)
 858 {
 859     return pthread_create(t, NULL, thread_run, NULL) == 0;
 860 }
 861
 862 static int wait_for_thread(thread_t thread)
 863 {
 864     return pthread_join(thread, NULL) == 0;
 865 }
 866
 867 # endif
 868
 869 /*
 870  * The main thread will also run the test, so we'll have THREADS+1 parallel
 871  * tests running
 872  */
 873 # define THREADS 3
 874
 875 static int test_multi_thread(void)
 876 {
 877     thread_t t[THREADS];
 878     int i;
 879
 880     for (i = 0; i < THREADS; i++)
 881         run_thread(&t[i]);
 882     run_multi_thread_test();
 883     for (i = 0; i < THREADS; i++)
 884         wait_for_thread(t[i]);
 885
 886     if (!TEST_true(multi_thread_rand_bytes_succeeded))
 887         return 0;
 888     if (!TEST_true(multi_thread_rand_priv_bytes_succeeded))
 889         return 0;
 890
 891     return 1;
 892 }
 893 #endif
 894
 895 /*
 896  * Test that instantiation with RAND_seed() works as expected
 897  *
 898  * If no os entropy source is available then RAND_seed(buffer, bufsize)
 899  * is expected to succeed if and only if the buffer length is at least
 900  * rand_drbg_seedlen(master) bytes.
 901  *
 902  * If an os entropy source is available then RAND_seed(buffer, bufsize)
 903  * is expected to succeed always.
 904  */
 905 static int test_rand_seed(void)
 906 {
 907     RAND_DRBG *master = NULL;
 908     unsigned char rand_buf[256];
 909     size_t rand_buflen;
 910     size_t required_seed_buflen = 0;
 911
 912     if (!TEST_ptr(master = RAND_DRBG_get0_master()))
 913         return 0;
 914
 915 #ifdef OPENSSL_RAND_SEED_NONE
 916     required_seed_buflen = rand_drbg_seedlen(master);
 917 #endif
 918
 919     memset(rand_buf, 0xCD, sizeof(rand_buf));
 920
 921     for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) {
 922         RAND_DRBG_uninstantiate(master);
 923         RAND_seed(rand_buf, rand_buflen);
 924
 925         if (!TEST_int_eq(RAND_status(),
 926                          (rand_buflen >= required_seed_buflen)))
 927             return 0;
 928     }
 929
 930     return 1;
 931 }
 932
 933 /*
 934  * Test that adding additional data with RAND_add() works as expected
 935  * when the master DRBG is instantiated (and below its reseed limit).
 936  *
 937  * This should succeed regardless of whether an os entropy source is
 938  * available or not.
 939  */
 940 static int test_rand_add(void)
 941 {
 942     unsigned char rand_buf[256];
 943     size_t rand_buflen;
 944
 945     memset(rand_buf, 0xCD, sizeof(rand_buf));
 946
 947     /* make sure it's instantiated */
 948     RAND_seed(rand_buf, sizeof(rand_buf));
 949     if (!TEST_true(RAND_status()))
 950         return 0;
 951
 952     for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) {
 953         RAND_add(rand_buf, rand_buflen, 0.0);
 954         if (!TEST_true(RAND_status()))
 955             return 0;
 956     }
 957
 958     return 1;
 959 }
 960
 961 int setup_tests(void)
 962 {
 963     app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
 964
 965     ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test));
 966     ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test));
 967     ADD_TEST(test_rand_drbg_reseed);
 968     ADD_TEST(test_rand_seed);
 969     ADD_TEST(test_rand_add);
 970 #if defined(OPENSSL_THREADS)
 971     ADD_TEST(test_multi_thread);
 972 #endif
 973     return 1;
 974 }