test/drbgtest.c

   1 /*
   2  * Copyright 2011-2023 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 /* We need to use some deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include <string.h>
  14 #include "internal/nelem.h"
  15 #include <openssl/crypto.h>
  16 #include <openssl/err.h>
  17 #include <openssl/rand.h>
  18 #include <openssl/obj_mac.h>
  19 #include <openssl/evp.h>
  20 #include <openssl/aes.h>
  21 #include "../crypto/rand/rand_local.h"
  22 #include "../include/crypto/rand.h"
  23 #include "../include/crypto/evp.h"
  24 #include "../providers/implementations/rands/drbg_local.h"
  25 #include "../crypto/evp/evp_local.h"
  26
  27 #if defined(_WIN32)
  28 # include <windows.h>
  29 #endif
  30
  31 #if defined(OPENSSL_SYS_UNIX)
  32 # include <sys/types.h>
  33 # include <sys/wait.h>
  34 # include <unistd.h>
  35 #endif
  36
  37 #include "testutil.h"
  38
  39 /*
  40  * DRBG generate wrappers
  41  */
  42 static int gen_bytes(EVP_RAND_CTX *drbg, unsigned char *buf, int num)
  43 {
  44 #ifndef OPENSSL_NO_DEPRECATED_3_0
  45     const RAND_METHOD *meth = RAND_get_rand_method();
  46
  47     if (meth != NULL && meth != RAND_OpenSSL()) {
  48         if (meth->bytes != NULL)
  49             return meth->bytes(buf, num);
  50         return -1;
  51     }
  52 #endif
  53
  54     if (drbg != NULL)
  55         return EVP_RAND_generate(drbg, buf, num, 0, 0, NULL, 0);
  56     return 0;
  57 }
  58
  59 static int rand_bytes(unsigned char *buf, int num)
  60 {
  61     return gen_bytes(RAND_get0_public(NULL), buf, num);
  62 }
  63
  64 static int rand_priv_bytes(unsigned char *buf, int num)
  65 {
  66     return gen_bytes(RAND_get0_private(NULL), buf, num);
  67 }
  68
  69
  70 /* size of random output generated in test_drbg_reseed() */
  71 #define RANDOM_SIZE 16
  72
  73 /*
  74  * DRBG query functions
  75  */
  76 static int state(EVP_RAND_CTX *drbg)
  77 {
  78     return EVP_RAND_get_state(drbg);
  79 }
  80
  81 static unsigned int query_rand_uint(EVP_RAND_CTX *drbg, const char *name)
  82 {
  83     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  84     unsigned int n;
  85
  86     *params = OSSL_PARAM_construct_uint(name, &n);
  87     if (EVP_RAND_CTX_get_params(drbg, params))
  88         return n;
  89     return 0;
  90 }
  91
  92 #define DRBG_UINT(name)                                 \
  93     static unsigned int name(EVP_RAND_CTX *drbg)        \
  94     {                                                   \
  95         return query_rand_uint(drbg, #name);            \
  96     }
  97 DRBG_UINT(reseed_counter)
  98
  99 static PROV_DRBG *prov_rand(EVP_RAND_CTX *drbg)
 100 {
 101     return (PROV_DRBG *)drbg->algctx;
 102 }
 103
 104 static void set_reseed_counter(EVP_RAND_CTX *drbg, unsigned int n)
 105 {
 106     PROV_DRBG *p = prov_rand(drbg);
 107
 108     p->reseed_counter = n;
 109 }
 110
 111 static void inc_reseed_counter(EVP_RAND_CTX *drbg)
 112 {
 113     set_reseed_counter(drbg, reseed_counter(drbg) + 1);
 114 }
 115
 116 static time_t reseed_time(EVP_RAND_CTX *drbg)
 117 {
 118     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 119     time_t t;
 120
 121     *params = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME, &t);
 122     if (EVP_RAND_CTX_get_params(drbg, params))
 123         return t;
 124     return 0;
 125 }
 126
 127 /*
 128  * When building the FIPS module, it isn't possible to disable the continuous
 129  * RNG tests.  Tests that require this are skipped and this means a detection
 130  * mechanism for the FIPS provider being in use.
 131  */
 132 static int using_fips_rng(void)
 133 {
 134     EVP_RAND_CTX *primary = RAND_get0_primary(NULL);
 135     const OSSL_PROVIDER *prov;
 136     const char *name;
 137
 138     if (!TEST_ptr(primary))
 139         return 0;
 140
 141     prov = EVP_RAND_get0_provider(EVP_RAND_CTX_get0_rand(primary));
 142     if (!TEST_ptr(prov))
 143         return 0;
 144     name = OSSL_PROVIDER_get0_name(prov);
 145     return strcmp(name, "OpenSSL FIPS Provider") == 0;
 146 }
 147
 148  /*
 149  * Disable CRNG testing if it is enabled.
 150  * This stub remains to indicate the calling locations where it is necessary.
 151  * Once the RNG infrastructure is able to disable these tests, it should be
 152  * reconstituted.
 153  */
 154 static int disable_crngt(EVP_RAND_CTX *drbg)
 155 {
 156     return 1;
 157 }
 158
 159 /*
 160  * Generates random output using rand_bytes() and rand_priv_bytes()
 161  * and checks whether the three shared DRBGs were reseeded as
 162  * expected.
 163  *
 164  * |expect_success|: expected outcome (as reported by RAND_status())
 165  * |primary|, |public|, |private|: pointers to the three shared DRBGs
 166  * |public_random|, |private_random|: generated random output
 167  * |expect_xxx_reseed| =
 168  *       1:  it is expected that the specified DRBG is reseeded
 169  *       0:  it is expected that the specified DRBG is not reseeded
 170  *      -1:  don't check whether the specified DRBG was reseeded or not
 171  * |reseed_when|: if nonzero, used instead of time(NULL) to set the
 172  *                |before_reseed| time.
 173  */
 174 static int test_drbg_reseed(int expect_success,
 175                             EVP_RAND_CTX *primary,
 176                             EVP_RAND_CTX *public,
 177                             EVP_RAND_CTX *private,
 178                             unsigned char *public_random,
 179                             unsigned char *private_random,
 180                             int expect_primary_reseed,
 181                             int expect_public_reseed,
 182                             int expect_private_reseed,
 183                             time_t reseed_when
 184                            )
 185 {
 186     time_t before_reseed, after_reseed;
 187     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
 188     unsigned int primary_reseed, public_reseed, private_reseed;
 189     unsigned char dummy[RANDOM_SIZE];
 190
 191     if (public_random == NULL)
 192         public_random = dummy;
 193
 194     if (private_random == NULL)
 195         private_random = dummy;
 196
 197     /*
 198      * step 1: check preconditions
 199      */
 200
 201     /* Test whether seed propagation is enabled */
 202     if (!TEST_int_ne(primary_reseed = reseed_counter(primary), 0)
 203         || !TEST_int_ne(public_reseed = reseed_counter(public), 0)
 204         || !TEST_int_ne(private_reseed = reseed_counter(private), 0))
 205         return 0;
 206
 207     /*
 208      * step 2: generate random output
 209      */
 210
 211     if (reseed_when == 0)
 212         reseed_when = time(NULL);
 213
 214     /* Generate random output from the public and private DRBG */
 215     before_reseed = expect_primary_reseed == 1 ? reseed_when : 0;
 216     if (!TEST_int_eq(rand_bytes((unsigned char*)public_random,
 217                                 RANDOM_SIZE), expect_success)
 218         || !TEST_int_eq(rand_priv_bytes((unsigned char*) private_random,
 219                                         RANDOM_SIZE), expect_success))
 220         return 0;
 221     after_reseed = time(NULL);
 222
 223
 224     /*
 225      * step 3: check postconditions
 226      */
 227
 228     /* Test whether reseeding succeeded as expected */
 229     if (!TEST_int_eq(state(primary), expected_state)
 230         || !TEST_int_eq(state(public), expected_state)
 231         || !TEST_int_eq(state(private), expected_state))
 232         return 0;
 233
 234     if (expect_primary_reseed >= 0) {
 235         /* Test whether primary DRBG was reseeded as expected */
 236         if (!TEST_int_ge(reseed_counter(primary), primary_reseed))
 237             return 0;
 238     }
 239
 240     if (expect_public_reseed >= 0) {
 241         /* Test whether public DRBG was reseeded as expected */
 242         if (!TEST_int_ge(reseed_counter(public), public_reseed)
 243                 || !TEST_uint_ge(reseed_counter(public),
 244                                  reseed_counter(primary)))
 245             return 0;
 246     }
 247
 248     if (expect_private_reseed >= 0) {
 249         /* Test whether public DRBG was reseeded as expected */
 250         if (!TEST_int_ge(reseed_counter(private), private_reseed)
 251                 || !TEST_uint_ge(reseed_counter(private),
 252                                  reseed_counter(primary)))
 253             return 0;
 254     }
 255
 256     if (expect_success == 1) {
 257         /* Test whether reseed time of primary DRBG is set correctly */
 258         if (!TEST_time_t_le(before_reseed, reseed_time(primary))
 259             || !TEST_time_t_le(reseed_time(primary), after_reseed))
 260             return 0;
 261
 262         /* Test whether reseed times of child DRBGs are synchronized with primary */
 263         if (!TEST_time_t_ge(reseed_time(public), reseed_time(primary))
 264             || !TEST_time_t_ge(reseed_time(private), reseed_time(primary)))
 265             return 0;
 266     } else {
 267         ERR_clear_error();
 268     }
 269
 270     return 1;
 271 }
 272
 273
 274 #if defined(OPENSSL_SYS_UNIX) && !defined(OPENSSL_RAND_SEED_EGD)
 275 /* number of children to fork */
 276 #define DRBG_FORK_COUNT 9
 277 /* two results per child, two for the parent */
 278 #define DRBG_FORK_RESULT_COUNT (2 * (DRBG_FORK_COUNT + 1))
 279
 280 typedef struct drbg_fork_result_st {
 281
 282     unsigned char random[RANDOM_SIZE]; /* random output */
 283
 284     int pindex;               /* process index (0: parent, 1,2,3...: children)*/
 285     pid_t pid;                /* process id */
 286     int private;              /* true if the private drbg was used */
 287     char name[10];            /* 'parent' resp. 'child 1', 'child 2', ... */
 288 } drbg_fork_result;
 289
 290 /*
 291  * Sort the drbg_fork_result entries in lexicographical order
 292  *
 293  * This simplifies finding duplicate random output and makes
 294  * the printout in case of an error more readable.
 295  */
 296 static int compare_drbg_fork_result(const void *left, const void *right)
 297 {
 298     int result;
 299     const drbg_fork_result *l = left;
 300     const drbg_fork_result *r = right;
 301
 302     /* separate public and private results */
 303     result = l->private - r->private;
 304
 305     if (result == 0)
 306         result = memcmp(l->random, r->random, RANDOM_SIZE);
 307
 308     if (result == 0)
 309         result = l->pindex - r->pindex;
 310
 311     return result;
 312 }
 313
 314 /*
 315  * Sort two-byte chunks of random data
 316  *
 317  * Used for finding collisions in two-byte chunks
 318  */
 319 static int compare_rand_chunk(const void *left, const void *right)
 320 {
 321     return memcmp(left, right, 2);
 322 }
 323
 324 /*
 325  * Test whether primary, public and private DRBG are reseeded
 326  * in the child after forking the process. Collect the random
 327  * output of the public and private DRBG and send it back to
 328  * the parent process.
 329  */
 330 static int test_drbg_reseed_in_child(EVP_RAND_CTX *primary,
 331                                      EVP_RAND_CTX *public,
 332                                      EVP_RAND_CTX *private,
 333                                      drbg_fork_result result[2])
 334 {
 335     int rv = 0, status;
 336     int fd[2];
 337     pid_t pid;
 338     unsigned char random[2 * RANDOM_SIZE];
 339
 340     if (!TEST_int_ge(pipe(fd), 0))
 341         return 0;
 342
 343     if (!TEST_int_ge(pid = fork(), 0)) {
 344         close(fd[0]);
 345         close(fd[1]);
 346         return 0;
 347     } else if (pid > 0) {
 348
 349         /* I'm the parent; close the write end */
 350         close(fd[1]);
 351
 352         /* wait for children to terminate and collect their random output */
 353         if (TEST_int_eq(waitpid(pid, &status, 0), pid)
 354             && TEST_int_eq(status, 0)
 355             && TEST_true(read(fd[0], &random[0], sizeof(random))
 356                           == sizeof(random))) {
 357
 358             /* random output of public drbg */
 359             result[0].pid = pid;
 360             result[0].private = 0;
 361             memcpy(result[0].random, &random[0], RANDOM_SIZE);
 362
 363             /* random output of private drbg */
 364             result[1].pid = pid;
 365             result[1].private = 1;
 366             memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
 367
 368             rv = 1;
 369         }
 370
 371         /* close the read end */
 372         close(fd[0]);
 373
 374         return rv;
 375
 376     } else {
 377
 378         /* I'm the child; close the read end */
 379         close(fd[0]);
 380
 381         /* check whether all three DRBGs reseed and send output to parent */
 382         if (TEST_true(test_drbg_reseed(1, primary, public, private,
 383                                         &random[0], &random[RANDOM_SIZE],
 384                                        1, 1, 1, 0))
 385             && TEST_true(write(fd[1], random, sizeof(random))
 386                          == sizeof(random))) {
 387
 388             rv = 1;
 389         }
 390
 391         /* close the write end */
 392         close(fd[1]);
 393
 394         /* convert boolean to exit code */
 395         exit(rv == 0);
 396     }
 397 }
 398
 399 static int test_rand_reseed_on_fork(EVP_RAND_CTX *primary,
 400                                     EVP_RAND_CTX *public,
 401                                     EVP_RAND_CTX *private)
 402 {
 403     unsigned int i;
 404     pid_t pid = getpid();
 405     int verbose = (getenv("V") != NULL);
 406     int success = 1;
 407     int duplicate[2] = {0, 0};
 408     unsigned char random[2 * RANDOM_SIZE];
 409     unsigned char sample[DRBG_FORK_RESULT_COUNT * RANDOM_SIZE];
 410     unsigned char *psample = &sample[0];
 411     drbg_fork_result result[DRBG_FORK_RESULT_COUNT];
 412     drbg_fork_result *presult = &result[2];
 413
 414     memset(&result,  0, sizeof(result));
 415
 416     for (i = 1 ; i <= DRBG_FORK_COUNT ; ++i) {
 417
 418         presult[0].pindex = presult[1].pindex = i;
 419
 420         sprintf(presult[0].name, "child %d", i);
 421         strcpy(presult[1].name, presult[0].name);
 422
 423         /* collect the random output of the children */
 424         if (!TEST_true(test_drbg_reseed_in_child(primary,
 425                                                  public,
 426                                                  private,
 427                                                  presult)))
 428             return 0;
 429
 430         presult += 2;
 431     }
 432
 433     /* collect the random output of the parent */
 434     if (!TEST_true(test_drbg_reseed(1,
 435                                     primary, public, private,
 436                                     &random[0], &random[RANDOM_SIZE],
 437                                     0, 0, 0, 0)))
 438         return 0;
 439
 440     strcpy(result[0].name, "parent");
 441     strcpy(result[1].name, "parent");
 442
 443     /* output of public drbg */
 444     result[0].pid = pid;
 445     result[0].private = 0;
 446     memcpy(result[0].random, &random[0], RANDOM_SIZE);
 447
 448     /* output of private drbg */
 449     result[1].pid = pid;
 450     result[1].private = 1;
 451     memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
 452
 453     /* collect all sampled random data in a single buffer */
 454     for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 455         memcpy(psample, &result[i].random[0], RANDOM_SIZE);
 456         psample += RANDOM_SIZE;
 457     }
 458
 459     /* sort the results... */
 460     qsort(result, DRBG_FORK_RESULT_COUNT, sizeof(drbg_fork_result),
 461           compare_drbg_fork_result);
 462
 463     /* ...and count duplicate prefixes by looking at the first byte only */
 464     for (i = 1 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 465         if (result[i].random[0] == result[i-1].random[0]) {
 466             /* count public and private duplicates separately */
 467             ++duplicate[result[i].private];
 468         }
 469     }
 470
 471     if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
 472         /* just too many duplicates to be a coincidence */
 473         TEST_note("ERROR: %d duplicate prefixes in public random output", duplicate[0]);
 474         success = 0;
 475     }
 476
 477     if (duplicate[1] >= DRBG_FORK_COUNT - 1) {
 478         /* just too many duplicates to be a coincidence */
 479         TEST_note("ERROR: %d duplicate prefixes in private random output", duplicate[1]);
 480         success = 0;
 481     }
 482
 483     duplicate[0] = 0;
 484
 485     /* sort the two-byte chunks... */
 486     qsort(sample, sizeof(sample)/2, 2, compare_rand_chunk);
 487
 488     /* ...and count duplicate chunks */
 489     for (i = 2, psample = sample + 2 ; i < sizeof(sample) ; i += 2, psample += 2) {
 490         if (compare_rand_chunk(psample - 2, psample) == 0)
 491             ++duplicate[0];
 492     }
 493
 494     if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
 495         /* just too many duplicates to be a coincidence */
 496         TEST_note("ERROR: %d duplicate chunks in random output", duplicate[0]);
 497         success = 0;
 498     }
 499
 500     if (verbose || !success) {
 501
 502         for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 503             char *rand_hex = OPENSSL_buf2hexstr(result[i].random, RANDOM_SIZE);
 504
 505             TEST_note("    random: %s, pid: %d (%s, %s)",
 506                       rand_hex,
 507                       result[i].pid,
 508                       result[i].name,
 509                       result[i].private ? "private" : "public"
 510                       );
 511
 512             OPENSSL_free(rand_hex);
 513         }
 514     }
 515
 516     return success;
 517 }
 518
 519 static int test_rand_fork_safety(int i)
 520 {
 521     int success = 1;
 522     unsigned char random[1];
 523     EVP_RAND_CTX *primary, *public, *private;
 524
 525     /* All three DRBGs should be non-null */
 526     if (!TEST_ptr(primary = RAND_get0_primary(NULL))
 527         || !TEST_ptr(public = RAND_get0_public(NULL))
 528         || !TEST_ptr(private = RAND_get0_private(NULL)))
 529         return 0;
 530
 531     /* run the actual test */
 532     if (!TEST_true(test_rand_reseed_on_fork(primary, public, private)))
 533         success = 0;
 534
 535     /* request a single byte from each of the DRBGs before the next run */
 536     if (!TEST_int_gt(RAND_bytes(random, 1), 0) || !TEST_int_gt(RAND_priv_bytes(random, 1), 0))
 537         success = 0;
 538
 539     return success;
 540 }
 541 #endif
 542
 543 /*
 544  * Test whether the default rand_method (RAND_OpenSSL()) is
 545  * setup correctly, in particular whether reseeding works
 546  * as designed.
 547  */
 548 static int test_rand_reseed(void)
 549 {
 550     EVP_RAND_CTX *primary, *public, *private;
 551     unsigned char rand_add_buf[256];
 552     int rv = 0;
 553     time_t before_reseed;
 554
 555     if (using_fips_rng())
 556         return TEST_skip("CRNGT cannot be disabled");
 557
 558 #ifndef OPENSSL_NO_DEPRECATED_3_0
 559     /* Check whether RAND_OpenSSL() is the default method */
 560     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
 561         return 0;
 562 #endif
 563
 564     /* All three DRBGs should be non-null */
 565     if (!TEST_ptr(primary = RAND_get0_primary(NULL))
 566         || !TEST_ptr(public = RAND_get0_public(NULL))
 567         || !TEST_ptr(private = RAND_get0_private(NULL)))
 568         return 0;
 569
 570     /* There should be three distinct DRBGs, two of them chained to primary */
 571     if (!TEST_ptr_ne(public, private)
 572         || !TEST_ptr_ne(public, primary)
 573         || !TEST_ptr_ne(private, primary)
 574         || !TEST_ptr_eq(prov_rand(public)->parent, prov_rand(primary))
 575         || !TEST_ptr_eq(prov_rand(private)->parent, prov_rand(primary)))
 576         return 0;
 577
 578     /* Disable CRNG testing for the primary DRBG */
 579     if (!TEST_true(disable_crngt(primary)))
 580         return 0;
 581
 582     /* uninstantiate the three global DRBGs */
 583     EVP_RAND_uninstantiate(primary);
 584     EVP_RAND_uninstantiate(private);
 585     EVP_RAND_uninstantiate(public);
 586
 587     /*
 588      * Test initial seeding of shared DRBGs
 589      */
 590     if (!TEST_true(test_drbg_reseed(1,
 591                                     primary, public, private,
 592                                     NULL, NULL,
 593                                     1, 1, 1, 0)))
 594         goto error;
 595
 596     /*
 597      * Test initial state of shared DRBGs
 598      */
 599     if (!TEST_true(test_drbg_reseed(1,
 600                                     primary, public, private,
 601                                     NULL, NULL,
 602                                     0, 0, 0, 0)))
 603         goto error;
 604
 605     /*
 606      * Test whether the public and private DRBG are both reseeded when their
 607      * reseed counters differ from the primary's reseed counter.
 608      */
 609     inc_reseed_counter(primary);
 610     if (!TEST_true(test_drbg_reseed(1,
 611                                     primary, public, private,
 612                                     NULL, NULL,
 613                                     0, 1, 1, 0)))
 614         goto error;
 615
 616     /*
 617      * Test whether the public DRBG is reseeded when its reseed counter differs
 618      * from the primary's reseed counter.
 619      */
 620     inc_reseed_counter(primary);
 621     inc_reseed_counter(private);
 622     if (!TEST_true(test_drbg_reseed(1,
 623                                     primary, public, private,
 624                                     NULL, NULL,
 625                                     0, 1, 0, 0)))
 626         goto error;
 627
 628     /*
 629      * Test whether the private DRBG is reseeded when its reseed counter differs
 630      * from the primary's reseed counter.
 631      */
 632     inc_reseed_counter(primary);
 633     inc_reseed_counter(public);
 634     if (!TEST_true(test_drbg_reseed(1,
 635                                     primary, public, private,
 636                                     NULL, NULL,
 637                                     0, 0, 1, 0)))
 638         goto error;
 639
 640     /* fill 'randomness' buffer with some arbitrary data */
 641     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
 642
 643     /*
 644      * Test whether all three DRBGs are reseeded by RAND_add().
 645      * The before_reseed time has to be measured here and passed into the
 646      * test_drbg_reseed() test, because the primary DRBG gets already reseeded
 647      * in RAND_add(), whence the check for the condition
 648      * before_reseed <= reseed_time(primary) will fail if the time value happens
 649      * to increase between the RAND_add() and the test_drbg_reseed() call.
 650      */
 651     before_reseed = time(NULL);
 652     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 653     if (!TEST_true(test_drbg_reseed(1,
 654                                     primary, public, private,
 655                                     NULL, NULL,
 656                                     1, 1, 1,
 657                                     before_reseed)))
 658         goto error;
 659
 660     rv = 1;
 661
 662 error:
 663    return rv;
 664 }
 665
 666 #if defined(OPENSSL_THREADS)
 667 static int multi_thread_rand_bytes_succeeded = 1;
 668 static int multi_thread_rand_priv_bytes_succeeded = 1;
 669
 670 static int set_reseed_time_interval(EVP_RAND_CTX *drbg, int t)
 671 {
 672     OSSL_PARAM params[2];
 673
 674     params[0] = OSSL_PARAM_construct_int(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL,
 675                                          &t);
 676     params[1] = OSSL_PARAM_construct_end();
 677     return EVP_RAND_CTX_set_params(drbg, params);
 678 }
 679
 680 static void run_multi_thread_test(void)
 681 {
 682     unsigned char buf[256];
 683     time_t start = time(NULL);
 684     EVP_RAND_CTX *public = NULL, *private = NULL;
 685
 686     if (!TEST_ptr(public = RAND_get0_public(NULL))
 687             || !TEST_ptr(private = RAND_get0_private(NULL))
 688             || !TEST_true(set_reseed_time_interval(private, 1))
 689             || !TEST_true(set_reseed_time_interval(public, 1))) {
 690         multi_thread_rand_bytes_succeeded = 0;
 691         return;
 692     }
 693
 694     do {
 695         if (rand_bytes(buf, sizeof(buf)) <= 0)
 696             multi_thread_rand_bytes_succeeded = 0;
 697         if (rand_priv_bytes(buf, sizeof(buf)) <= 0)
 698             multi_thread_rand_priv_bytes_succeeded = 0;
 699     }
 700     while (time(NULL) - start < 5);
 701 }
 702
 703 # if defined(OPENSSL_SYS_WINDOWS)
 704
 705 typedef HANDLE thread_t;
 706
 707 static DWORD WINAPI thread_run(LPVOID arg)
 708 {
 709     run_multi_thread_test();
 710     /*
 711      * Because we're linking with a static library, we must stop each
 712      * thread explicitly, or so says OPENSSL_thread_stop(3)
 713      */
 714     OPENSSL_thread_stop();
 715     return 0;
 716 }
 717
 718 static int run_thread(thread_t *t)
 719 {
 720     *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL);
 721     return *t != NULL;
 722 }
 723
 724 static int wait_for_thread(thread_t thread)
 725 {
 726     return WaitForSingleObject(thread, INFINITE) == 0;
 727 }
 728
 729 # else
 730
 731 typedef pthread_t thread_t;
 732
 733 static void *thread_run(void *arg)
 734 {
 735     run_multi_thread_test();
 736     /*
 737      * Because we're linking with a static library, we must stop each
 738      * thread explicitly, or so says OPENSSL_thread_stop(3)
 739      */
 740     OPENSSL_thread_stop();
 741     return NULL;
 742 }
 743
 744 static int run_thread(thread_t *t)
 745 {
 746     return pthread_create(t, NULL, thread_run, NULL) == 0;
 747 }
 748
 749 static int wait_for_thread(thread_t thread)
 750 {
 751     return pthread_join(thread, NULL) == 0;
 752 }
 753
 754 # endif
 755
 756 /*
 757  * The main thread will also run the test, so we'll have THREADS+1 parallel
 758  * tests running
 759  */
 760 # define THREADS 3
 761
 762 static int test_multi_thread(void)
 763 {
 764     thread_t t[THREADS];
 765     int i;
 766
 767     for (i = 0; i < THREADS; i++)
 768         run_thread(&t[i]);
 769     run_multi_thread_test();
 770     for (i = 0; i < THREADS; i++)
 771         wait_for_thread(t[i]);
 772
 773     if (!TEST_true(multi_thread_rand_bytes_succeeded))
 774         return 0;
 775     if (!TEST_true(multi_thread_rand_priv_bytes_succeeded))
 776         return 0;
 777
 778     return 1;
 779 }
 780 #endif
 781
 782 static EVP_RAND_CTX *new_drbg(EVP_RAND_CTX *parent)
 783 {
 784     OSSL_PARAM params[2];
 785     EVP_RAND *rand = NULL;
 786     EVP_RAND_CTX *drbg = NULL;
 787
 788     params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
 789                                                  "AES-256-CTR", 0);
 790     params[1] = OSSL_PARAM_construct_end();
 791
 792     if (!TEST_ptr(rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL))
 793             || !TEST_ptr(drbg = EVP_RAND_CTX_new(rand, parent))
 794             || !TEST_true(EVP_RAND_CTX_set_params(drbg, params))) {
 795         EVP_RAND_CTX_free(drbg);
 796         drbg = NULL;
 797     }
 798     EVP_RAND_free(rand);
 799     return drbg;
 800 }
 801
 802 static int test_rand_prediction_resistance(void)
 803 {
 804     EVP_RAND_CTX *x = NULL, *y = NULL, *z = NULL;
 805     unsigned char buf1[51], buf2[sizeof(buf1)];
 806     int ret = 0, xreseed, yreseed, zreseed;
 807
 808     if (using_fips_rng())
 809         return TEST_skip("CRNGT cannot be disabled");
 810
 811     /* Initialise a three long DRBG chain */
 812     if (!TEST_ptr(x = new_drbg(NULL))
 813         || !TEST_true(disable_crngt(x))
 814         || !TEST_true(EVP_RAND_instantiate(x, 0, 0, NULL, 0, NULL))
 815         || !TEST_ptr(y = new_drbg(x))
 816         || !TEST_true(EVP_RAND_instantiate(y, 0, 0, NULL, 0, NULL))
 817         || !TEST_ptr(z = new_drbg(y))
 818         || !TEST_true(EVP_RAND_instantiate(z, 0, 0, NULL, 0, NULL)))
 819         goto err;
 820
 821     /*
 822      * During a normal reseed, only the last DRBG in the chain should
 823      * be reseeded.
 824      */
 825     inc_reseed_counter(y);
 826     xreseed = reseed_counter(x);
 827     yreseed = reseed_counter(y);
 828     zreseed = reseed_counter(z);
 829     if (!TEST_true(EVP_RAND_reseed(z, 0, NULL, 0, NULL, 0))
 830         || !TEST_int_eq(reseed_counter(x), xreseed)
 831         || !TEST_int_eq(reseed_counter(y), yreseed)
 832         || !TEST_int_gt(reseed_counter(z), zreseed))
 833         goto err;
 834
 835     /*
 836      * When prediction resistance is requested, the request should be
 837      * propagated to the primary, so that the entire DRBG chain reseeds.
 838      */
 839     zreseed = reseed_counter(z);
 840     if (!TEST_true(EVP_RAND_reseed(z, 1, NULL, 0, NULL, 0))
 841         || !TEST_int_gt(reseed_counter(x), xreseed)
 842         || !TEST_int_gt(reseed_counter(y), yreseed)
 843         || !TEST_int_gt(reseed_counter(z), zreseed))
 844         goto err;
 845
 846     /*
 847      * During a normal generate, only the last DRBG should be reseed */
 848     inc_reseed_counter(y);
 849     xreseed = reseed_counter(x);
 850     yreseed = reseed_counter(y);
 851     zreseed = reseed_counter(z);
 852     if (!TEST_true(EVP_RAND_generate(z, buf1, sizeof(buf1), 0, 0, NULL, 0))
 853         || !TEST_int_eq(reseed_counter(x), xreseed)
 854         || !TEST_int_eq(reseed_counter(y), yreseed)
 855         || !TEST_int_gt(reseed_counter(z), zreseed))
 856         goto err;
 857
 858     /*
 859      * When a prediction resistant generate is requested, the request
 860      * should be propagated to the primary, reseeding the entire DRBG chain.
 861      */
 862     zreseed = reseed_counter(z);
 863     if (!TEST_true(EVP_RAND_generate(z, buf2, sizeof(buf2), 0, 1, NULL, 0))
 864         || !TEST_int_gt(reseed_counter(x), xreseed)
 865         || !TEST_int_gt(reseed_counter(y), yreseed)
 866         || !TEST_int_gt(reseed_counter(z), zreseed)
 867         || !TEST_mem_ne(buf1, sizeof(buf1), buf2, sizeof(buf2)))
 868         goto err;
 869
 870     /* Verify that a normal reseed still only reseeds the last DRBG */
 871     inc_reseed_counter(y);
 872     xreseed = reseed_counter(x);
 873     yreseed = reseed_counter(y);
 874     zreseed = reseed_counter(z);
 875     if (!TEST_true(EVP_RAND_reseed(z, 0, NULL, 0, NULL, 0))
 876         || !TEST_int_eq(reseed_counter(x), xreseed)
 877         || !TEST_int_eq(reseed_counter(y), yreseed)
 878         || !TEST_int_gt(reseed_counter(z), zreseed))
 879         goto err;
 880
 881     ret = 1;
 882 err:
 883     EVP_RAND_CTX_free(z);
 884     EVP_RAND_CTX_free(y);
 885     EVP_RAND_CTX_free(x);
 886     return ret;
 887 }
 888
 889 int setup_tests(void)
 890 {
 891     ADD_TEST(test_rand_reseed);
 892 #if defined(OPENSSL_SYS_UNIX) && !defined(OPENSSL_RAND_SEED_EGD)
 893     ADD_ALL_TESTS(test_rand_fork_safety, RANDOM_SIZE);
 894 #endif
 895     ADD_TEST(test_rand_prediction_resistance);
 896 #if defined(OPENSSL_THREADS)
 897     ADD_TEST(test_multi_thread);
 898 #endif
 899     return 1;
 900 }