test/drbgtest.c

   1 /*
   2  * Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include "internal/nelem.h"
  12 #include <openssl/crypto.h>
  13 #include <openssl/err.h>
  14 #include <openssl/rand.h>
  15 #include <openssl/obj_mac.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/aes.h>
  18 #include "../crypto/rand/rand_local.h"
  19 #include "../include/crypto/rand.h"
  20 #include "../include/crypto/evp.h"
  21 #include "../providers/implementations/rands/drbg_local.h"
  22 #include "../crypto/evp/evp_local.h"
  23
  24 #if defined(_WIN32)
  25 # include <windows.h>
  26 #endif
  27
  28 #if defined(__TANDEM)
  29 # if defined(OPENSSL_TANDEM_FLOSS)
  30 #  include <floss.h(floss_fork)>
  31 # endif
  32 #endif
  33
  34 #if defined(OPENSSL_SYS_UNIX)
  35 # include <sys/types.h>
  36 # include <sys/wait.h>
  37 # include <unistd.h>
  38 #endif
  39
  40 #include "testutil.h"
  41
  42 /*
  43  * DRBG generate wrappers
  44  */
  45 static int gen_bytes(EVP_RAND_CTX *drbg, unsigned char *buf, int num)
  46 {
  47     const RAND_METHOD *meth = RAND_get_rand_method();
  48
  49     if (meth != NULL && meth != RAND_OpenSSL()) {
  50         if (meth->bytes != NULL)
  51             return meth->bytes(buf, num);
  52         return -1;
  53     }
  54
  55     if (drbg != NULL)
  56         return EVP_RAND_generate(drbg, buf, num, 0, 0, NULL, 0);
  57     return 0;
  58 }
  59
  60 static int rand_bytes(unsigned char *buf, int num)
  61 {
  62     return gen_bytes(RAND_get0_public(NULL), buf, num);
  63 }
  64
  65 static int rand_priv_bytes(unsigned char *buf, int num)
  66 {
  67     return gen_bytes(RAND_get0_private(NULL), buf, num);
  68 }
  69
  70
  71 /* size of random output generated in test_drbg_reseed() */
  72 #define RANDOM_SIZE 16
  73
  74 /*
  75  * DRBG query functions
  76  */
  77 static int state(EVP_RAND_CTX *drbg)
  78 {
  79     return EVP_RAND_state(drbg);
  80 }
  81
  82 static unsigned int query_rand_uint(EVP_RAND_CTX *drbg, const char *name)
  83 {
  84     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
  85     unsigned int n;
  86
  87     *params = OSSL_PARAM_construct_uint(name, &n);
  88     if (EVP_RAND_get_ctx_params(drbg, params))
  89         return n;
  90     return 0;
  91 }
  92
  93 #define DRBG_UINT(name)                                 \
  94     static unsigned int name(EVP_RAND_CTX *drbg)        \
  95     {                                                   \
  96         return query_rand_uint(drbg, #name);            \
  97     }
  98 DRBG_UINT(reseed_counter)
  99
 100 static PROV_DRBG *prov_rand(EVP_RAND_CTX *drbg)
 101 {
 102     return (PROV_DRBG *)drbg->data;
 103 }
 104
 105 static void set_reseed_counter(EVP_RAND_CTX *drbg, unsigned int n)
 106 {
 107     PROV_DRBG *p = prov_rand(drbg);
 108
 109     p->reseed_counter = n;
 110 }
 111
 112 static void inc_reseed_counter(EVP_RAND_CTX *drbg)
 113 {
 114     set_reseed_counter(drbg, reseed_counter(drbg) + 1);
 115 }
 116
 117 static time_t reseed_time(EVP_RAND_CTX *drbg)
 118 {
 119     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 120     time_t t;
 121
 122     *params = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME, &t);
 123     if (EVP_RAND_get_ctx_params(drbg, params))
 124         return t;
 125     return 0;
 126 }
 127
 128 /*
 129  * When building the FIPS module, it isn't possible to disable the continuous
 130  * RNG tests.  Tests that require this are skipped.
 131  */
 132 static int crngt_skip(void)
 133 {
 134 #ifdef FIPS_MODULE
 135     return 1;
 136 #else
 137     return 0;
 138 #endif
 139 }
 140
 141  /*
 142  * Disable CRNG testing if it is enabled.
 143  * This stub remains to indicate the calling locations where it is necessary.
 144  * Once the RNG infrastructure is able to disable these tests, it should be
 145  * reconstituted.
 146  */
 147 static int disable_crngt(EVP_RAND_CTX *drbg)
 148 {
 149     return 1;
 150 }
 151
 152 /*
 153  * Generates random output using rand_bytes() and rand_priv_bytes()
 154  * and checks whether the three shared DRBGs were reseeded as
 155  * expected.
 156  *
 157  * |expect_success|: expected outcome (as reported by RAND_status())
 158  * |primary|, |public|, |private|: pointers to the three shared DRBGs
 159  * |public_random|, |private_random|: generated random output
 160  * |expect_xxx_reseed| =
 161  *       1:  it is expected that the specified DRBG is reseeded
 162  *       0:  it is expected that the specified DRBG is not reseeded
 163  *      -1:  don't check whether the specified DRBG was reseeded or not
 164  * |reseed_when|: if nonzero, used instead of time(NULL) to set the
 165  *                |before_reseed| time.
 166  */
 167 static int test_drbg_reseed(int expect_success,
 168                             EVP_RAND_CTX *primary,
 169                             EVP_RAND_CTX *public,
 170                             EVP_RAND_CTX *private,
 171                             unsigned char *public_random,
 172                             unsigned char *private_random,
 173                             int expect_primary_reseed,
 174                             int expect_public_reseed,
 175                             int expect_private_reseed,
 176                             time_t reseed_when
 177                            )
 178 {
 179     time_t before_reseed, after_reseed;
 180     int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
 181     unsigned int primary_reseed, public_reseed, private_reseed;
 182     unsigned char dummy[RANDOM_SIZE];
 183
 184     if (public_random == NULL)
 185         public_random = dummy;
 186
 187     if (private_random == NULL)
 188         private_random = dummy;
 189
 190     /*
 191      * step 1: check preconditions
 192      */
 193
 194     /* Test whether seed propagation is enabled */
 195     if (!TEST_int_ne(primary_reseed = reseed_counter(primary), 0)
 196         || !TEST_int_ne(public_reseed = reseed_counter(public), 0)
 197         || !TEST_int_ne(private_reseed = reseed_counter(private), 0))
 198         return 0;
 199
 200     /*
 201      * step 2: generate random output
 202      */
 203
 204     if (reseed_when == 0)
 205         reseed_when = time(NULL);
 206
 207     /* Generate random output from the public and private DRBG */
 208     before_reseed = expect_primary_reseed == 1 ? reseed_when : 0;
 209     if (!TEST_int_eq(rand_bytes((unsigned char*)public_random,
 210                                 RANDOM_SIZE), expect_success)
 211         || !TEST_int_eq(rand_priv_bytes((unsigned char*) private_random,
 212                                         RANDOM_SIZE), expect_success))
 213         return 0;
 214     after_reseed = time(NULL);
 215
 216
 217     /*
 218      * step 3: check postconditions
 219      */
 220
 221     /* Test whether reseeding succeeded as expected */
 222     if (!TEST_int_eq(state(primary), expected_state)
 223         || !TEST_int_eq(state(public), expected_state)
 224         || !TEST_int_eq(state(private), expected_state))
 225         return 0;
 226
 227     if (expect_primary_reseed >= 0) {
 228         /* Test whether primary DRBG was reseeded as expected */
 229         if (!TEST_int_ge(reseed_counter(primary), primary_reseed))
 230             return 0;
 231     }
 232
 233     if (expect_public_reseed >= 0) {
 234         /* Test whether public DRBG was reseeded as expected */
 235         if (!TEST_int_ge(reseed_counter(public), public_reseed)
 236                 || !TEST_uint_ge(reseed_counter(public),
 237                                  reseed_counter(primary)))
 238             return 0;
 239     }
 240
 241     if (expect_private_reseed >= 0) {
 242         /* Test whether public DRBG was reseeded as expected */
 243         if (!TEST_int_ge(reseed_counter(private), private_reseed)
 244                 || !TEST_uint_ge(reseed_counter(private),
 245                                  reseed_counter(primary)))
 246             return 0;
 247     }
 248
 249     if (expect_success == 1) {
 250         /* Test whether reseed time of primary DRBG is set correctly */
 251         if (!TEST_time_t_le(before_reseed, reseed_time(primary))
 252             || !TEST_time_t_le(reseed_time(primary), after_reseed))
 253             return 0;
 254
 255         /* Test whether reseed times of child DRBGs are synchronized with primary */
 256         if (!TEST_time_t_ge(reseed_time(public), reseed_time(primary))
 257             || !TEST_time_t_ge(reseed_time(private), reseed_time(primary)))
 258             return 0;
 259     } else {
 260         ERR_clear_error();
 261     }
 262
 263     return 1;
 264 }
 265
 266
 267 #if defined(OPENSSL_SYS_UNIX)
 268 /* number of children to fork */
 269 #define DRBG_FORK_COUNT 9
 270 /* two results per child, two for the parent */
 271 #define DRBG_FORK_RESULT_COUNT (2 * (DRBG_FORK_COUNT + 1))
 272
 273 typedef struct drbg_fork_result_st {
 274
 275     unsigned char random[RANDOM_SIZE]; /* random output */
 276
 277     int pindex;               /* process index (0: parent, 1,2,3...: children)*/
 278     pid_t pid;                /* process id */
 279     int private;              /* true if the private drbg was used */
 280     char name[10];            /* 'parent' resp. 'child 1', 'child 2', ... */
 281 } drbg_fork_result;
 282
 283 /*
 284  * Sort the drbg_fork_result entries in lexicographical order
 285  *
 286  * This simplifies finding duplicate random output and makes
 287  * the printout in case of an error more readable.
 288  */
 289 static int compare_drbg_fork_result(const void * left, const void * right)
 290 {
 291     int result;
 292     const drbg_fork_result *l = left;
 293     const drbg_fork_result *r = right;
 294
 295     /* separate public and private results */
 296     result = l->private - r->private;
 297
 298     if (result == 0)
 299         result = memcmp(l->random, r->random, RANDOM_SIZE);
 300
 301     if (result == 0)
 302         result = l->pindex - r->pindex;
 303
 304     return result;
 305 }
 306
 307 /*
 308  * Sort two-byte chunks of random data
 309  *
 310  * Used for finding collisions in two-byte chunks
 311  */
 312 static int compare_rand_chunk(const void * left, const void * right)
 313 {
 314     return memcmp(left, right, 2);
 315 }
 316
 317 /*
 318  * Test whether primary, public and private DRBG are reseeded
 319  * in the child after forking the process. Collect the random
 320  * output of the public and private DRBG and send it back to
 321  * the parent process.
 322  */
 323 static int test_drbg_reseed_in_child(EVP_RAND_CTX *primary,
 324                                      EVP_RAND_CTX *public,
 325                                      EVP_RAND_CTX *private,
 326                                      drbg_fork_result result[2])
 327 {
 328     int rv = 0, status;
 329     int fd[2];
 330     pid_t pid;
 331     unsigned char random[2 * RANDOM_SIZE];
 332
 333     if (!TEST_int_ge(pipe(fd), 0))
 334         return 0;
 335
 336     if (!TEST_int_ge(pid = fork(), 0)) {
 337         close(fd[0]);
 338         close(fd[1]);
 339         return 0;
 340     } else if (pid > 0) {
 341
 342         /* I'm the parent; close the write end */
 343         close(fd[1]);
 344
 345         /* wait for children to terminate and collect their random output */
 346         if (TEST_int_eq(waitpid(pid, &status, 0), pid)
 347             && TEST_int_eq(status, 0)
 348             && TEST_true(read(fd[0], &random[0], sizeof(random))
 349                           == sizeof(random))) {
 350
 351             /* random output of public drbg */
 352             result[0].pid = pid;
 353             result[0].private = 0;
 354             memcpy(result[0].random, &random[0], RANDOM_SIZE);
 355
 356             /* random output of private drbg */
 357             result[1].pid = pid;
 358             result[1].private = 1;
 359             memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
 360
 361             rv = 1;
 362         }
 363
 364         /* close the read end */
 365         close(fd[0]);
 366
 367         return rv;
 368
 369     } else {
 370
 371         /* I'm the child; close the read end */
 372         close(fd[0]);
 373
 374         /* check whether all three DRBGs reseed and send output to parent */
 375         if (TEST_true(test_drbg_reseed(1, primary, public, private,
 376                                         &random[0], &random[RANDOM_SIZE],
 377                                        1, 1, 1, 0))
 378             && TEST_true(write(fd[1], random, sizeof(random))
 379                          == sizeof(random))) {
 380
 381             rv = 1;
 382         }
 383
 384         /* close the write end */
 385         close(fd[1]);
 386
 387         /* convert boolean to exit code */
 388         exit(rv == 0);
 389     }
 390 }
 391
 392 static int test_rand_reseed_on_fork(EVP_RAND_CTX *primary,
 393                                     EVP_RAND_CTX *public,
 394                                     EVP_RAND_CTX *private)
 395 {
 396     unsigned int i;
 397     pid_t pid = getpid();
 398     int verbose = (getenv("V") != NULL);
 399     int success = 1;
 400     int duplicate[2] = {0, 0};
 401     unsigned char random[2 * RANDOM_SIZE];
 402     unsigned char sample[DRBG_FORK_RESULT_COUNT * RANDOM_SIZE];
 403     unsigned char *psample = &sample[0];
 404     drbg_fork_result result[DRBG_FORK_RESULT_COUNT];
 405     drbg_fork_result *presult = &result[2];
 406
 407     memset(&result,  0, sizeof(result));
 408
 409     for (i = 1 ; i <= DRBG_FORK_COUNT ; ++i) {
 410
 411         presult[0].pindex = presult[1].pindex = i;
 412
 413         sprintf(presult[0].name, "child %d", i);
 414         strcpy(presult[1].name, presult[0].name);
 415
 416         /* collect the random output of the children */
 417         if (!TEST_true(test_drbg_reseed_in_child(primary,
 418                                                  public,
 419                                                  private,
 420                                                  presult)))
 421             return 0;
 422
 423         presult += 2;
 424     }
 425
 426     /* collect the random output of the parent */
 427     if (!TEST_true(test_drbg_reseed(1,
 428                                     primary, public, private,
 429                                     &random[0], &random[RANDOM_SIZE],
 430                                     0, 0, 0, 0)))
 431         return 0;
 432
 433     strcpy(result[0].name, "parent");
 434     strcpy(result[1].name, "parent");
 435
 436     /* output of public drbg */
 437     result[0].pid = pid;
 438     result[0].private = 0;
 439     memcpy(result[0].random, &random[0], RANDOM_SIZE);
 440
 441     /* output of private drbg */
 442     result[1].pid = pid;
 443     result[1].private = 1;
 444     memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
 445
 446     /* collect all sampled random data in a single buffer */
 447     for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 448         memcpy(psample, &result[i].random[0], RANDOM_SIZE);
 449         psample += RANDOM_SIZE;
 450     }
 451
 452     /* sort the results... */
 453     qsort(result, DRBG_FORK_RESULT_COUNT, sizeof(drbg_fork_result),
 454           compare_drbg_fork_result);
 455
 456     /* ...and count duplicate prefixes by looking at the first byte only */
 457     for (i = 1 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 458         if (result[i].random[0] == result[i-1].random[0]) {
 459             /* count public and private duplicates separately */
 460             ++duplicate[result[i].private];
 461         }
 462     }
 463
 464     if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
 465         /* just too many duplicates to be a coincidence */
 466         TEST_note("ERROR: %d duplicate prefixes in public random output", duplicate[0]);
 467         success = 0;
 468     }
 469
 470     if (duplicate[1] >= DRBG_FORK_COUNT - 1) {
 471         /* just too many duplicates to be a coincidence */
 472         TEST_note("ERROR: %d duplicate prefixes in private random output", duplicate[1]);
 473         success = 0;
 474     }
 475
 476     duplicate[0] = 0;
 477
 478     /* sort the two-byte chunks... */
 479     qsort(sample, sizeof(sample)/2, 2, compare_rand_chunk);
 480
 481     /* ...and count duplicate chunks */
 482     for (i = 2, psample = sample + 2 ; i < sizeof(sample) ; i += 2, psample += 2) {
 483         if (compare_rand_chunk(psample - 2, psample) == 0)
 484             ++duplicate[0];
 485     }
 486
 487     if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
 488         /* just too many duplicates to be a coincidence */
 489         TEST_note("ERROR: %d duplicate chunks in random output", duplicate[0]);
 490         success = 0;
 491     }
 492
 493     if (verbose || !success) {
 494
 495         for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
 496             char *rand_hex = OPENSSL_buf2hexstr(result[i].random, RANDOM_SIZE);
 497
 498             TEST_note("    random: %s, pid: %d (%s, %s)",
 499                       rand_hex,
 500                       result[i].pid,
 501                       result[i].name,
 502                       result[i].private ? "private" : "public"
 503                       );
 504
 505             OPENSSL_free(rand_hex);
 506         }
 507     }
 508
 509     return success;
 510 }
 511
 512 static int test_rand_fork_safety(int i)
 513 {
 514     int success = 1;
 515     unsigned char random[1];
 516     EVP_RAND_CTX *primary, *public, *private;
 517
 518     /* All three DRBGs should be non-null */
 519     if (!TEST_ptr(primary = RAND_get0_primary(NULL))
 520         || !TEST_ptr(public = RAND_get0_public(NULL))
 521         || !TEST_ptr(private = RAND_get0_private(NULL)))
 522         return 0;
 523
 524     /* run the actual test */
 525     if (!TEST_true(test_rand_reseed_on_fork(primary, public, private)))
 526         success = 0;
 527
 528     /* request a single byte from each of the DRBGs before the next run */
 529     if (!TEST_true(RAND_bytes(random, 1) && RAND_priv_bytes(random, 1)))
 530         success = 0;
 531
 532     return success;
 533 }
 534 #endif
 535
 536 /*
 537  * Test whether the default rand_method (RAND_OpenSSL()) is
 538  * setup correctly, in particular whether reseeding  works
 539  * as designed.
 540  */
 541 static int test_rand_reseed(void)
 542 {
 543     EVP_RAND_CTX *primary, *public, *private;
 544     unsigned char rand_add_buf[256];
 545     int rv = 0;
 546     time_t before_reseed;
 547
 548     if (crngt_skip())
 549         return TEST_skip("CRNGT cannot be disabled");
 550
 551     /* Check whether RAND_OpenSSL() is the default method */
 552     if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL()))
 553         return 0;
 554
 555     /* All three DRBGs should be non-null */
 556     if (!TEST_ptr(primary = RAND_get0_primary(NULL))
 557         || !TEST_ptr(public = RAND_get0_public(NULL))
 558         || !TEST_ptr(private = RAND_get0_private(NULL)))
 559         return 0;
 560
 561     /* There should be three distinct DRBGs, two of them chained to primary */
 562     if (!TEST_ptr_ne(public, private)
 563         || !TEST_ptr_ne(public, primary)
 564         || !TEST_ptr_ne(private, primary)
 565         || !TEST_ptr_eq(prov_rand(public)->parent, prov_rand(primary))
 566         || !TEST_ptr_eq(prov_rand(private)->parent, prov_rand(primary)))
 567         return 0;
 568
 569     /* Disable CRNG testing for the primary DRBG */
 570     if (!TEST_true(disable_crngt(primary)))
 571         return 0;
 572
 573     /* uninstantiate the three global DRBGs */
 574     EVP_RAND_uninstantiate(primary);
 575     EVP_RAND_uninstantiate(private);
 576     EVP_RAND_uninstantiate(public);
 577
 578
 579     /*
 580      * Test initial seeding of shared DRBGs
 581      */
 582     if (!TEST_true(test_drbg_reseed(1,
 583                                     primary, public, private,
 584                                     NULL, NULL,
 585                                     1, 1, 1, 0)))
 586         goto error;
 587
 588
 589     /*
 590      * Test initial state of shared DRBGs
 591      */
 592     if (!TEST_true(test_drbg_reseed(1,
 593                                     primary, public, private,
 594                                     NULL, NULL,
 595                                     0, 0, 0, 0)))
 596         goto error;
 597
 598     /*
 599      * Test whether the public and private DRBG are both reseeded when their
 600      * reseed counters differ from the primary's reseed counter.
 601      */
 602     inc_reseed_counter(primary);
 603     if (!TEST_true(test_drbg_reseed(1,
 604                                     primary, public, private,
 605                                     NULL, NULL,
 606                                     0, 1, 1, 0)))
 607         goto error;
 608
 609     /*
 610      * Test whether the public DRBG is reseeded when its reseed counter differs
 611      * from the primary's reseed counter.
 612      */
 613     inc_reseed_counter(primary);
 614     inc_reseed_counter(private);
 615     if (!TEST_true(test_drbg_reseed(1,
 616                                     primary, public, private,
 617                                     NULL, NULL,
 618                                     0, 1, 0, 0)))
 619         goto error;
 620
 621     /*
 622      * Test whether the private DRBG is reseeded when its reseed counter differs
 623      * from the primary's reseed counter.
 624      */
 625     inc_reseed_counter(primary);
 626     inc_reseed_counter(public);
 627     if (!TEST_true(test_drbg_reseed(1,
 628                                     primary, public, private,
 629                                     NULL, NULL,
 630                                     0, 0, 1, 0)))
 631         goto error;
 632
 633     /* fill 'randomness' buffer with some arbitrary data */
 634     memset(rand_add_buf, 'r', sizeof(rand_add_buf));
 635
 636 #ifndef FIPS_MODULE
 637     /*
 638      * Test whether all three DRBGs are reseeded by RAND_add().
 639      * The before_reseed time has to be measured here and passed into the
 640      * test_drbg_reseed() test, because the primary DRBG gets already reseeded
 641      * in RAND_add(), whence the check for the condition
 642      * before_reseed <= reseed_time(primary) will fail if the time value happens
 643      * to increase between the RAND_add() and the test_drbg_reseed() call.
 644      */
 645     before_reseed = time(NULL);
 646     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 647     if (!TEST_true(test_drbg_reseed(1,
 648                                     primary, public, private,
 649                                     NULL, NULL,
 650                                     1, 1, 1,
 651                                     before_reseed)))
 652         goto error;
 653 #else /* FIPS_MODULE */
 654     /*
 655      * In FIPS mode, random data provided by the application via RAND_add()
 656      * is not considered a trusted entropy source. It is only treated as
 657      * additional_data and no reseeding is forced. This test assures that
 658      * no reseeding occurs.
 659      */
 660     before_reseed = time(NULL);
 661     RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
 662     if (!TEST_true(test_drbg_reseed(1,
 663                                     primary, public, private,
 664                                     NULL, NULL,
 665                                     0, 0, 0,
 666                                     before_reseed)))
 667         goto error;
 668 #endif
 669
 670     rv = 1;
 671
 672 error:
 673    return rv;
 674 }
 675
 676 #if defined(OPENSSL_THREADS)
 677 static int multi_thread_rand_bytes_succeeded = 1;
 678 static int multi_thread_rand_priv_bytes_succeeded = 1;
 679
 680 static int set_reseed_time_interval(EVP_RAND_CTX *drbg, int t)
 681 {
 682     OSSL_PARAM params[2];
 683
 684     params[0] = OSSL_PARAM_construct_int(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL,
 685                                          &t);
 686     params[1] = OSSL_PARAM_construct_end();
 687     return EVP_RAND_set_ctx_params(drbg, params);
 688 }
 689
 690 static void run_multi_thread_test(void)
 691 {
 692     unsigned char buf[256];
 693     time_t start = time(NULL);
 694     EVP_RAND_CTX *public = NULL, *private = NULL;
 695
 696     if (!TEST_ptr(public = RAND_get0_public(NULL))
 697             || !TEST_ptr(private = RAND_get0_private(NULL))
 698             || !TEST_true(set_reseed_time_interval(private, 1))
 699             || !TEST_true(set_reseed_time_interval(public, 1))) {
 700         multi_thread_rand_bytes_succeeded = 0;
 701         return;
 702     }
 703
 704     do {
 705         if (rand_bytes(buf, sizeof(buf)) <= 0)
 706             multi_thread_rand_bytes_succeeded = 0;
 707         if (rand_priv_bytes(buf, sizeof(buf)) <= 0)
 708             multi_thread_rand_priv_bytes_succeeded = 0;
 709     }
 710     while (time(NULL) - start < 5);
 711 }
 712
 713 # if defined(OPENSSL_SYS_WINDOWS)
 714
 715 typedef HANDLE thread_t;
 716
 717 static DWORD WINAPI thread_run(LPVOID arg)
 718 {
 719     run_multi_thread_test();
 720     /*
 721      * Because we're linking with a static library, we must stop each
 722      * thread explicitly, or so says OPENSSL_thread_stop(3)
 723      */
 724     OPENSSL_thread_stop();
 725     return 0;
 726 }
 727
 728 static int run_thread(thread_t *t)
 729 {
 730     *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL);
 731     return *t != NULL;
 732 }
 733
 734 static int wait_for_thread(thread_t thread)
 735 {
 736     return WaitForSingleObject(thread, INFINITE) == 0;
 737 }
 738
 739 # else
 740
 741 typedef pthread_t thread_t;
 742
 743 static void *thread_run(void *arg)
 744 {
 745     run_multi_thread_test();
 746     /*
 747      * Because we're linking with a static library, we must stop each
 748      * thread explicitly, or so says OPENSSL_thread_stop(3)
 749      */
 750     OPENSSL_thread_stop();
 751     return NULL;
 752 }
 753
 754 static int run_thread(thread_t *t)
 755 {
 756     return pthread_create(t, NULL, thread_run, NULL) == 0;
 757 }
 758
 759 static int wait_for_thread(thread_t thread)
 760 {
 761     return pthread_join(thread, NULL) == 0;
 762 }
 763
 764 # endif
 765
 766 /*
 767  * The main thread will also run the test, so we'll have THREADS+1 parallel
 768  * tests running
 769  */
 770 # define THREADS 3
 771
 772 static int test_multi_thread(void)
 773 {
 774     thread_t t[THREADS];
 775     int i;
 776
 777     for (i = 0; i < THREADS; i++)
 778         run_thread(&t[i]);
 779     run_multi_thread_test();
 780     for (i = 0; i < THREADS; i++)
 781         wait_for_thread(t[i]);
 782
 783     if (!TEST_true(multi_thread_rand_bytes_succeeded))
 784         return 0;
 785     if (!TEST_true(multi_thread_rand_priv_bytes_succeeded))
 786         return 0;
 787
 788     return 1;
 789 }
 790 #endif
 791
 792 static EVP_RAND_CTX *new_drbg(EVP_RAND_CTX *parent)
 793 {
 794     OSSL_PARAM params[2];
 795     EVP_RAND *rand = NULL;
 796     EVP_RAND_CTX *drbg = NULL;
 797
 798     params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
 799                                                  "AES-256-CTR", 0);
 800     params[1] = OSSL_PARAM_construct_end();
 801
 802     if (!TEST_ptr(rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL))
 803             || !TEST_ptr(drbg = EVP_RAND_CTX_new(rand, parent))
 804             || !TEST_true(EVP_RAND_set_ctx_params(drbg, params))) {
 805         EVP_RAND_CTX_free(drbg);
 806         drbg = NULL;
 807     }
 808     EVP_RAND_free(rand);
 809     return drbg;
 810 }
 811
 812 static int test_rand_prediction_resistance(void)
 813 {
 814     EVP_RAND_CTX *x = NULL, *y = NULL, *z = NULL;
 815     unsigned char buf1[51], buf2[sizeof(buf1)];
 816     int ret = 0, xreseed, yreseed, zreseed;
 817
 818     if (crngt_skip())
 819         return TEST_skip("CRNGT cannot be disabled");
 820
 821     /* Initialise a three long DRBG chain */
 822     if (!TEST_ptr(x = new_drbg(NULL))
 823         || !TEST_true(disable_crngt(x))
 824         || !TEST_true(EVP_RAND_instantiate(x, 0, 0, NULL, 0))
 825         || !TEST_ptr(y = new_drbg(x))
 826         || !TEST_true(EVP_RAND_instantiate(y, 0, 0, NULL, 0))
 827         || !TEST_ptr(z = new_drbg(y))
 828         || !TEST_true(EVP_RAND_instantiate(z, 0, 0, NULL, 0)))
 829         goto err;
 830
 831     /*
 832      * During a normal reseed, only the last DRBG in the chain should
 833      * be reseeded.
 834      */
 835     inc_reseed_counter(y);
 836     xreseed = reseed_counter(x);
 837     yreseed = reseed_counter(y);
 838     zreseed = reseed_counter(z);
 839     if (!TEST_true(EVP_RAND_reseed(z, 0, NULL, 0, NULL, 0))
 840         || !TEST_int_eq(reseed_counter(x), xreseed)
 841         || !TEST_int_eq(reseed_counter(y), yreseed)
 842         || !TEST_int_gt(reseed_counter(z), zreseed))
 843         goto err;
 844
 845     /*
 846      * When prediction resistance is requested, the request should be
 847      * propagated to the primary, so that the entire DRBG chain reseeds.
 848      */
 849     zreseed = reseed_counter(z);
 850     if (!TEST_true(EVP_RAND_reseed(z, 1, NULL, 0, NULL, 0))
 851         || !TEST_int_gt(reseed_counter(x), xreseed)
 852         || !TEST_int_gt(reseed_counter(y), yreseed)
 853         || !TEST_int_gt(reseed_counter(z), zreseed))
 854         goto err;
 855
 856     /*
 857      * During a normal generate, only the last DRBG should be reseed */
 858     inc_reseed_counter(y);
 859     xreseed = reseed_counter(x);
 860     yreseed = reseed_counter(y);
 861     zreseed = reseed_counter(z);
 862     if (!TEST_true(EVP_RAND_generate(z, buf1, sizeof(buf1), 0, 0, NULL, 0))
 863         || !TEST_int_eq(reseed_counter(x), xreseed)
 864         || !TEST_int_eq(reseed_counter(y), yreseed)
 865         || !TEST_int_gt(reseed_counter(z), zreseed))
 866         goto err;
 867
 868     /*
 869      * When a prediction resistant generate is requested, the request
 870      * should be propagated to the primary, reseeding the entire DRBG chain.
 871      */
 872     zreseed = reseed_counter(z);
 873     if (!TEST_true(EVP_RAND_generate(z, buf2, sizeof(buf2), 0, 1, NULL, 0))
 874         || !TEST_int_gt(reseed_counter(x), xreseed)
 875         || !TEST_int_gt(reseed_counter(y), yreseed)
 876         || !TEST_int_gt(reseed_counter(z), zreseed)
 877         || !TEST_mem_ne(buf1, sizeof(buf1), buf2, sizeof(buf2)))
 878         goto err;
 879
 880     /* Verify that a normal reseed still only reseeds the last DRBG */
 881     inc_reseed_counter(y);
 882     xreseed = reseed_counter(x);
 883     yreseed = reseed_counter(y);
 884     zreseed = reseed_counter(z);
 885     if (!TEST_true(EVP_RAND_reseed(z, 0, NULL, 0, NULL, 0))
 886         || !TEST_int_eq(reseed_counter(x), xreseed)
 887         || !TEST_int_eq(reseed_counter(y), yreseed)
 888         || !TEST_int_gt(reseed_counter(z), zreseed))
 889         goto err;
 890
 891     ret = 1;
 892 err:
 893     EVP_RAND_CTX_free(z);
 894     EVP_RAND_CTX_free(y);
 895     EVP_RAND_CTX_free(x);
 896     return ret;
 897 }
 898
 899 int setup_tests(void)
 900 {
 901     ADD_TEST(test_rand_reseed);
 902 #if defined(OPENSSL_SYS_UNIX)
 903     ADD_ALL_TESTS(test_rand_fork_safety, RANDOM_SIZE);
 904 #endif
 905     ADD_TEST(test_rand_prediction_resistance);
 906 #if defined(OPENSSL_THREADS)
 907     ADD_TEST(test_multi_thread);
 908 #endif
 909     return 1;
 910 }