test/drbgtest.c

   1 /*
   2  * Copyright 2011-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include "internal/nelem.h"
  12 #include <openssl/crypto.h>
  13 #include <openssl/err.h>
  14 #include <openssl/rand.h>
  15 #include <openssl/obj_mac.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/aes.h>
  18 #include "../crypto/rand/rand_lcl.h"
  19
  20 #include "testutil.h"
  21 #include "drbgtest.h"
  22
  23 typedef struct drbg_selftest_data_st {
  24     int post;
  25     int nid;
  26     unsigned int flags;
  27
  28     /* KAT data for no PR */
  29     const unsigned char *entropy;
  30     size_t entropylen;
  31     const unsigned char *nonce;
  32     size_t noncelen;
  33     const unsigned char *pers;
  34     size_t perslen;
  35     const unsigned char *adin;
  36     size_t adinlen;
  37     const unsigned char *entropyreseed;
  38     size_t entropyreseedlen;
  39     const unsigned char *adinreseed;
  40     size_t adinreseedlen;
  41     const unsigned char *adin2;
  42     size_t adin2len;
  43     const unsigned char *expected;
  44     size_t exlen;
  45     const unsigned char *kat2;
  46     size_t kat2len;
  47
  48     /* KAT data for PR */
  49     const unsigned char *entropy_pr;
  50     size_t entropylen_pr;
  51     const unsigned char *nonce_pr;
  52     size_t noncelen_pr;
  53     const unsigned char *pers_pr;
  54     size_t perslen_pr;
  55     const unsigned char *adin_pr;
  56     size_t adinlen_pr;
  57     const unsigned char *entropypr_pr;
  58     size_t entropyprlen_pr;
  59     const unsigned char *ading_pr;
  60     size_t adinglen_pr;
  61     const unsigned char *entropyg_pr;
  62     size_t entropyglen_pr;
  63     const unsigned char *kat_pr;
  64     size_t katlen_pr;
  65     const unsigned char *kat2_pr;
  66     size_t kat2len_pr;
  67 } DRBG_SELFTEST_DATA;
  68
  69 #define make_drbg_test_data(nid, flag, pr, post) {\
  70     post, nid, flag, \
  71     pr##_entropyinput, sizeof(pr##_entropyinput), \
  72     pr##_nonce, sizeof(pr##_nonce), \
  73     pr##_personalizationstring, sizeof(pr##_personalizationstring), \
  74     pr##_additionalinput, sizeof(pr##_additionalinput), \
  75     pr##_entropyinputreseed, sizeof(pr##_entropyinputreseed), \
  76     pr##_additionalinputreseed, sizeof(pr##_additionalinputreseed), \
  77     pr##_additionalinput2, sizeof(pr##_additionalinput2), \
  78     pr##_int_returnedbits, sizeof(pr##_int_returnedbits), \
  79     pr##_returnedbits, sizeof(pr##_returnedbits), \
  80     pr##_pr_entropyinput, sizeof(pr##_pr_entropyinput), \
  81     pr##_pr_nonce, sizeof(pr##_pr_nonce), \
  82     pr##_pr_personalizationstring, sizeof(pr##_pr_personalizationstring), \
  83     pr##_pr_additionalinput, sizeof(pr##_pr_additionalinput), \
  84     pr##_pr_entropyinputpr, sizeof(pr##_pr_entropyinputpr), \
  85     pr##_pr_additionalinput2, sizeof(pr##_pr_additionalinput2), \
  86     pr##_pr_entropyinputpr2, sizeof(pr##_pr_entropyinputpr2), \
  87     pr##_pr_int_returnedbits, sizeof(pr##_pr_int_returnedbits), \
  88     pr##_pr_returnedbits, sizeof(pr##_pr_returnedbits) \
  89     }
  90
  91 #define make_drbg_test_data_df(nid, pr, p) \
  92     make_drbg_test_data(nid, RAND_DRBG_FLAG_CTR_USE_DF, pr, p)
  93
  94 static DRBG_SELFTEST_DATA drbg_test[] = {
  95     make_drbg_test_data   (NID_aes_128_ctr, 0, aes_128_no_df, 0),
  96     make_drbg_test_data   (NID_aes_192_ctr, 0, aes_192_no_df, 0),
  97     make_drbg_test_data   (NID_aes_256_ctr, 0, aes_256_no_df, 1),
  98     make_drbg_test_data_df(NID_aes_128_ctr,    aes_128_use_df, 0),
  99     make_drbg_test_data_df(NID_aes_192_ctr,    aes_192_use_df, 0),
 100     make_drbg_test_data_df(NID_aes_256_ctr,    aes_256_use_df, 1),
 101 };
 102
 103 static int app_data_index;
 104
 105 /*
 106  * Test context data, attached as EXDATA to the RAND_DRBG
 107  */
 108 typedef struct test_ctx_st {
 109     const unsigned char *entropy;
 110     size_t entropylen;
 111     int entropycnt;
 112     const unsigned char *nonce;
 113     size_t noncelen;
 114     int noncecnt;
 115 } TEST_CTX;
 116
 117 static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout,
 118                           int entropy, size_t min_len, size_t max_len)
 119 {
 120     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 121
 122     t->entropycnt++;
 123     *pout = (unsigned char *)t->entropy;
 124     return t->entropylen;
 125 }
 126
 127 static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout,
 128                         int entropy, size_t min_len, size_t max_len)
 129 {
 130     TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index);
 131
 132     t->noncecnt++;
 133     *pout = (unsigned char *)t->nonce;
 134     return t->noncelen;
 135 }
 136
 137 static int uninstantiate(RAND_DRBG *drbg)
 138 {
 139     int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
 140
 141     ERR_clear_error();
 142     return ret;
 143 }
 144
 145 /*
 146  * Do a single KAT test.  Return 0 on failure.
 147  */
 148 static int single_kat(DRBG_SELFTEST_DATA *td)
 149 {
 150     RAND_DRBG *drbg = NULL;
 151     TEST_CTX t;
 152     int failures = 0;
 153     unsigned char buff[1024];
 154
 155     /*
 156      * Test without PR: Instantiate DRBG with test entropy, nonce and
 157      * personalisation string.
 158      */
 159     if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
 160         return 0;
 161     if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 162                                            kat_nonce, NULL))) {
 163         failures++;
 164         goto err;
 165     }
 166     memset(&t, 0, sizeof(t));
 167     t.entropy = td->entropy;
 168     t.entropylen = td->entropylen;
 169     t.nonce = td->nonce;
 170     t.noncelen = td->noncelen;
 171     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 172
 173     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))
 174             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 175                                              td->adin, td->adinlen))
 176             || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen))
 177         failures++;
 178
 179     /* Reseed DRBG with test entropy and additional input */
 180     t.entropy = td->entropyreseed;
 181     t.entropylen = td->entropyreseedlen;
 182     if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen)
 183             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0,
 184                                              td->adin2, td->adin2len))
 185             || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len)))
 186         failures++;
 187     uninstantiate(drbg);
 188
 189     /*
 190      * Now test with PR: Instantiate DRBG with test entropy, nonce and
 191      * personalisation string.
 192      */
 193     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 194             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 195                                                   kat_nonce, NULL)))
 196         failures++;
 197     RAND_DRBG_set_ex_data(drbg, app_data_index, &t);
 198     t.entropy = td->entropy_pr;
 199     t.entropylen = td->entropylen_pr;
 200     t.nonce = td->nonce_pr;
 201     t.noncelen = td->noncelen_pr;
 202     t.entropycnt = 0;
 203     t.noncecnt = 0;
 204     if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr)))
 205         failures++;
 206
 207     /*
 208      * Now generate with PR: we need to supply entropy as this will
 209      * perform a reseed operation.
 210      */
 211     t.entropy = td->entropypr_pr;
 212     t.entropylen = td->entropyprlen_pr;
 213     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1,
 214                                       td->adin_pr, td->adinlen_pr))
 215             || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr))
 216         failures++;
 217
 218     /*
 219      * Now generate again with PR: supply new entropy again.
 220      */
 221     t.entropy = td->entropyg_pr;
 222     t.entropylen = td->entropyglen_pr;
 223
 224     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1,
 225                                       td->ading_pr, td->adinglen_pr))
 226                 || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr,
 227                                 buff, td->kat2len_pr))
 228         failures++;
 229
 230 err:
 231     uninstantiate(drbg);
 232     RAND_DRBG_free(drbg);
 233     return failures == 0;
 234 }
 235
 236 /*
 237  * Initialise a DRBG based on selftest data
 238  */
 239 static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t)
 240 {
 241     if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags))
 242             || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
 243                                                   kat_nonce, NULL)))
 244         return 0;
 245     RAND_DRBG_set_ex_data(drbg, app_data_index, t);
 246     t->entropy = td->entropy;
 247     t->entropylen = td->entropylen;
 248     t->nonce = td->nonce;
 249     t->noncelen = td->noncelen;
 250     t->entropycnt = 0;
 251     t->noncecnt = 0;
 252     return 1;
 253 }
 254
 255 /*
 256  * Initialise and instantiate DRBG based on selftest data
 257  */
 258 static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td,
 259                        TEST_CTX *t)
 260 {
 261     if (!TEST_true(init(drbg, td, t))
 262             || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)))
 263         return 0;
 264     return 1;
 265 }
 266
 267 /*
 268  * Perform extensive error checking as required by SP800-90.
 269  * Induce several failure modes and check an error condition is set.
 270  */
 271 static int error_check(DRBG_SELFTEST_DATA *td)
 272 {
 273     static char zero[sizeof(RAND_DRBG)];
 274     RAND_DRBG *drbg = NULL;
 275     TEST_CTX t;
 276     unsigned char buff[1024];
 277     unsigned int reseed_counter_tmp;
 278     int ret = 0;
 279
 280     if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)))
 281         goto err;
 282
 283     /*
 284      * Personalisation string tests
 285      */
 286
 287     /* Test detection of too large personlisation string */
 288     if (!init(drbg, td, &t)
 289             || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0)
 290         goto err;
 291
 292     /*
 293      * Entropy source tests
 294      */
 295
 296     /* Test entropy source failure detecion: i.e. returns no data */
 297     t.entropylen = 0;
 298     if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0))
 299         goto err;
 300
 301     /* Try to generate output from uninstantiated DRBG */
 302     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 303                                        td->adin, td->adinlen))
 304             || !uninstantiate(drbg))
 305         goto err;
 306
 307     /* Test insufficient entropy */
 308     t.entropylen = drbg->min_entropylen - 1;
 309     if (!init(drbg, td, &t)
 310             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 311             || !uninstantiate(drbg))
 312         goto err;
 313
 314     /* Test too much entropy */
 315     t.entropylen = drbg->max_entropylen + 1;
 316     if (!init(drbg, td, &t)
 317             || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 318             || !uninstantiate(drbg))
 319         goto err;
 320
 321     /*
 322      * Nonce tests
 323      */
 324
 325     /* Test too small nonce */
 326     if (drbg->min_noncelen) {
 327         t.noncelen = drbg->min_noncelen - 1;
 328         if (!init(drbg, td, &t)
 329                 || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0
 330                 || !uninstantiate(drbg))
 331             goto err;
 332     }
 333
 334     /* Test too large nonce */
 335     if (drbg->max_noncelen) {
 336         t.noncelen = drbg->max_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     /* Instantiate with valid data, Check generation is now OK */
 344     if (!instantiate(drbg, td, &t)
 345             || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 346                                              td->adin, td->adinlen)))
 347         goto err;
 348
 349     /* Request too much data for one request */
 350     if (!TEST_false(RAND_DRBG_generate(drbg, buff, drbg->max_request + 1, 0,
 351                                        td->adin, td->adinlen)))
 352         goto err;
 353
 354     /* Try too large additional input */
 355     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 356                                        td->adin, drbg->max_adinlen + 1)))
 357         goto err;
 358
 359     /*
 360      * Check prediction resistance request fails if entropy source
 361      * failure.
 362      */
 363     t.entropylen = 0;
 364     if (TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 365                                       td->adin, td->adinlen))
 366             || !uninstantiate(drbg))
 367         goto err;
 368
 369     /* Instantiate again with valid data */
 370     if (!instantiate(drbg, td, &t))
 371         goto err;
 372     reseed_counter_tmp = drbg->reseed_counter;
 373     drbg->reseed_counter = drbg->reseed_interval;
 374
 375     /* Generate output and check entropy has been requested for reseed */
 376     t.entropycnt = 0;
 377     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 378                                       td->adin, td->adinlen))
 379             || !TEST_int_eq(t.entropycnt, 1)
 380             || !TEST_int_eq(drbg->reseed_counter, reseed_counter_tmp + 1)
 381             || !uninstantiate(drbg))
 382         goto err;
 383
 384     /*
 385      * Check prediction resistance request fails if entropy source
 386      * failure.
 387      */
 388     t.entropylen = 0;
 389     if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1,
 390                                        td->adin, td->adinlen))
 391             || !uninstantiate(drbg))
 392         goto err;
 393
 394     /* Test reseed counter works */
 395     if (!instantiate(drbg, td, &t))
 396         goto err;
 397     reseed_counter_tmp = drbg->reseed_counter;
 398     drbg->reseed_counter = drbg->reseed_interval;
 399
 400     /* Generate output and check entropy has been requested for reseed */
 401     t.entropycnt = 0;
 402     if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0,
 403                                       td->adin, td->adinlen))
 404             || !TEST_int_eq(t.entropycnt, 1)
 405             || !TEST_int_eq(drbg->reseed_counter, reseed_counter_tmp + 1)
 406             || !uninstantiate(drbg))
 407         goto err;
 408
 409     /*
 410      * Explicit reseed tests
 411      */
 412
 413     /* Test explicit reseed with too large additional input */
 414     if (!init(drbg, td, &t)
 415             || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1) > 0)
 416         goto err;
 417
 418     /* Test explicit reseed with entropy source failure */
 419     t.entropylen = 0;
 420     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
 421             || !uninstantiate(drbg))
 422         goto err;
 423
 424     /* Test explicit reseed with too much entropy */
 425     if (!init(drbg, td, &t))
 426         goto err;
 427     t.entropylen = drbg->max_entropylen + 1;
 428     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
 429             || !uninstantiate(drbg))
 430         goto err;
 431
 432     /* Test explicit reseed with too little entropy */
 433     if (!init(drbg, td, &t))
 434         goto err;
 435     t.entropylen = drbg->min_entropylen - 1;
 436     if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen), 0)
 437             || !uninstantiate(drbg))
 438         goto err;
 439
 440     /* Standard says we have to check uninstantiate really zeroes */
 441     if (!TEST_mem_eq(zero, sizeof(drbg->ctr), &drbg->ctr, sizeof(drbg->ctr)))
 442         goto err;
 443
 444     ret = 1;
 445
 446 err:
 447     uninstantiate(drbg);
 448     RAND_DRBG_free(drbg);
 449     return ret;
 450 }
 451
 452 static int test_kats(int i)
 453 {
 454     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 455     int rv = 0;
 456
 457     if (!single_kat(td))
 458         goto err;
 459     rv = 1;
 460
 461 err:
 462     return rv;
 463 }
 464
 465 static int test_error_checks(int i)
 466 {
 467     DRBG_SELFTEST_DATA *td = &drbg_test[i];
 468     int rv = 0;
 469
 470     if (error_check(td))
 471         goto err;
 472     rv = 1;
 473
 474 err:
 475     return rv;
 476 }
 477
 478 #define RAND_ADD_SIZE 500
 479
 480 static int test_rand_add(void)
 481 {
 482     char *p;
 483
 484     if (!TEST_ptr(p = malloc(RAND_ADD_SIZE)))
 485         return 0;
 486     RAND_add(p, RAND_ADD_SIZE, RAND_ADD_SIZE);
 487     free(p);
 488     return 1;
 489 }
 490
 491
 492 int setup_tests(void)
 493 {
 494     app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
 495
 496     ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test));
 497     ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test));
 498     ADD_TEST(test_rand_add);
 499     return 1;
 500 }