crypto/evp/evp_rand.c

   1 /*
   2  * Copyright 2020-2021 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 <openssl/evp.h>
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <openssl/engine.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/x509v3.h>
  17 #include <openssl/rand.h>
  18 #include <openssl/core.h>
  19 #include <openssl/core_names.h>
  20 #include <openssl/crypto.h>
  21 #include "crypto/asn1.h"
  22 #include "crypto/evp.h"
  23 #include "internal/cryptlib.h"
  24 #include "internal/numbers.h"
  25 #include "internal/provider.h"
  26 #include "evp_local.h"
  27
  28 struct evp_rand_st {
  29     OSSL_PROVIDER *prov;
  30     int name_id;
  31     CRYPTO_REF_COUNT refcnt;
  32     CRYPTO_RWLOCK *refcnt_lock;
  33
  34     const OSSL_DISPATCH *dispatch;
  35     OSSL_FUNC_rand_newctx_fn *newctx;
  36     OSSL_FUNC_rand_freectx_fn *freectx;
  37     OSSL_FUNC_rand_instantiate_fn *instantiate;
  38     OSSL_FUNC_rand_uninstantiate_fn *uninstantiate;
  39     OSSL_FUNC_rand_generate_fn *generate;
  40     OSSL_FUNC_rand_reseed_fn *reseed;
  41     OSSL_FUNC_rand_nonce_fn *nonce;
  42     OSSL_FUNC_rand_enable_locking_fn *enable_locking;
  43     OSSL_FUNC_rand_lock_fn *lock;
  44     OSSL_FUNC_rand_unlock_fn *unlock;
  45     OSSL_FUNC_rand_gettable_params_fn *gettable_params;
  46     OSSL_FUNC_rand_gettable_ctx_params_fn *gettable_ctx_params;
  47     OSSL_FUNC_rand_settable_ctx_params_fn *settable_ctx_params;
  48     OSSL_FUNC_rand_get_params_fn *get_params;
  49     OSSL_FUNC_rand_get_ctx_params_fn *get_ctx_params;
  50     OSSL_FUNC_rand_set_ctx_params_fn *set_ctx_params;
  51     OSSL_FUNC_rand_verify_zeroization_fn *verify_zeroization;
  52 } /* EVP_RAND */ ;
  53
  54 static int evp_rand_up_ref(void *vrand)
  55 {
  56     EVP_RAND *rand = (EVP_RAND *)vrand;
  57     int ref = 0;
  58
  59     if (rand != NULL)
  60         return CRYPTO_UP_REF(&rand->refcnt, &ref, rand->refcnt_lock);
  61     return 1;
  62 }
  63
  64 static void evp_rand_free(void *vrand){
  65     EVP_RAND *rand = (EVP_RAND *)vrand;
  66     int ref = 0;
  67
  68     if (rand != NULL) {
  69         CRYPTO_DOWN_REF(&rand->refcnt, &ref, rand->refcnt_lock);
  70         if (ref <= 0) {
  71             ossl_provider_free(rand->prov);
  72             CRYPTO_THREAD_lock_free(rand->refcnt_lock);
  73             OPENSSL_free(rand);
  74         }
  75     }
  76 }
  77
  78 static void *evp_rand_new(void)
  79 {
  80     EVP_RAND *rand = OPENSSL_zalloc(sizeof(*rand));
  81
  82     if (rand == NULL
  83             || (rand->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
  84         OPENSSL_free(rand);
  85         return NULL;
  86     }
  87     rand->refcnt = 1;
  88     return rand;
  89 }
  90
  91 /* Enable locking of the underlying DRBG/RAND if available */
  92 int EVP_RAND_enable_locking(EVP_RAND_CTX *rand)
  93 {
  94     if (rand->meth->enable_locking != NULL)
  95         return rand->meth->enable_locking(rand->data);
  96     ERR_raise(ERR_LIB_EVP, EVP_R_LOCKING_NOT_SUPPORTED);
  97     return 0;
  98 }
  99
 100 /* Lock the underlying DRBG/RAND if available */
 101 static int evp_rand_lock(EVP_RAND_CTX *rand)
 102 {
 103     if (rand->meth->lock != NULL)
 104         return rand->meth->lock(rand->data);
 105     return 1;
 106 }
 107
 108 /* Unlock the underlying DRBG/RAND if available */
 109 static void evp_rand_unlock(EVP_RAND_CTX *rand)
 110 {
 111     if (rand->meth->unlock != NULL)
 112         rand->meth->unlock(rand->data);
 113 }
 114
 115 static void *evp_rand_from_dispatch(int name_id,
 116                                     const OSSL_DISPATCH *fns,
 117                                     OSSL_PROVIDER *prov)
 118 {
 119     EVP_RAND *rand = NULL;
 120     int fnrandcnt = 0, fnctxcnt = 0, fnlockcnt = 0, fnenablelockcnt = 0;
 121 #ifdef FIPS_MODULE
 122     int fnzeroizecnt = 0;
 123 #endif
 124
 125     if ((rand = evp_rand_new()) == NULL) {
 126         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 127         return NULL;
 128     }
 129     rand->name_id = name_id;
 130     rand->dispatch = fns;
 131     for (; fns->function_id != 0; fns++) {
 132         switch (fns->function_id) {
 133         case OSSL_FUNC_RAND_NEWCTX:
 134             if (rand->newctx != NULL)
 135                 break;
 136             rand->newctx = OSSL_FUNC_rand_newctx(fns);
 137             fnctxcnt++;
 138             break;
 139         case OSSL_FUNC_RAND_FREECTX:
 140             if (rand->freectx != NULL)
 141                 break;
 142             rand->freectx = OSSL_FUNC_rand_freectx(fns);
 143             fnctxcnt++;
 144             break;
 145         case OSSL_FUNC_RAND_INSTANTIATE:
 146             if (rand->instantiate != NULL)
 147                 break;
 148             rand->instantiate = OSSL_FUNC_rand_instantiate(fns);
 149             fnrandcnt++;
 150             break;
 151         case OSSL_FUNC_RAND_UNINSTANTIATE:
 152              if (rand->uninstantiate != NULL)
 153                 break;
 154             rand->uninstantiate = OSSL_FUNC_rand_uninstantiate(fns);
 155             fnrandcnt++;
 156             break;
 157         case OSSL_FUNC_RAND_GENERATE:
 158             if (rand->generate != NULL)
 159                 break;
 160             rand->generate = OSSL_FUNC_rand_generate(fns);
 161             fnrandcnt++;
 162             break;
 163         case OSSL_FUNC_RAND_RESEED:
 164             if (rand->reseed != NULL)
 165                 break;
 166             rand->reseed = OSSL_FUNC_rand_reseed(fns);
 167             break;
 168         case OSSL_FUNC_RAND_NONCE:
 169             if (rand->nonce != NULL)
 170                 break;
 171             rand->nonce = OSSL_FUNC_rand_nonce(fns);
 172             break;
 173         case OSSL_FUNC_RAND_ENABLE_LOCKING:
 174             if (rand->enable_locking != NULL)
 175                 break;
 176             rand->enable_locking = OSSL_FUNC_rand_enable_locking(fns);
 177             fnenablelockcnt++;
 178             break;
 179         case OSSL_FUNC_RAND_LOCK:
 180             if (rand->lock != NULL)
 181                 break;
 182             rand->lock = OSSL_FUNC_rand_lock(fns);
 183             fnlockcnt++;
 184             break;
 185         case OSSL_FUNC_RAND_UNLOCK:
 186             if (rand->unlock != NULL)
 187                 break;
 188             rand->unlock = OSSL_FUNC_rand_unlock(fns);
 189             fnlockcnt++;
 190             break;
 191         case OSSL_FUNC_RAND_GETTABLE_PARAMS:
 192             if (rand->gettable_params != NULL)
 193                 break;
 194             rand->gettable_params =
 195                 OSSL_FUNC_rand_gettable_params(fns);
 196             break;
 197         case OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS:
 198             if (rand->gettable_ctx_params != NULL)
 199                 break;
 200             rand->gettable_ctx_params =
 201                 OSSL_FUNC_rand_gettable_ctx_params(fns);
 202             break;
 203         case OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS:
 204             if (rand->settable_ctx_params != NULL)
 205                 break;
 206             rand->settable_ctx_params =
 207                 OSSL_FUNC_rand_settable_ctx_params(fns);
 208             break;
 209         case OSSL_FUNC_RAND_GET_PARAMS:
 210             if (rand->get_params != NULL)
 211                 break;
 212             rand->get_params = OSSL_FUNC_rand_get_params(fns);
 213             break;
 214         case OSSL_FUNC_RAND_GET_CTX_PARAMS:
 215             if (rand->get_ctx_params != NULL)
 216                 break;
 217             rand->get_ctx_params = OSSL_FUNC_rand_get_ctx_params(fns);
 218             fnctxcnt++;
 219             break;
 220         case OSSL_FUNC_RAND_SET_CTX_PARAMS:
 221             if (rand->set_ctx_params != NULL)
 222                 break;
 223             rand->set_ctx_params = OSSL_FUNC_rand_set_ctx_params(fns);
 224             break;
 225         case OSSL_FUNC_RAND_VERIFY_ZEROIZATION:
 226             if (rand->verify_zeroization != NULL)
 227                 break;
 228             rand->verify_zeroization = OSSL_FUNC_rand_verify_zeroization(fns);
 229 #ifdef FIPS_MODULE
 230             fnzeroizecnt++;
 231 #endif
 232             break;
 233         }
 234     }
 235     /*
 236      * In order to be a consistent set of functions we must have at least
 237      * a complete set of "rand" functions and a complete set of context
 238      * management functions.  In FIPS mode, we also require the zeroization
 239      * verification function.
 240      *
 241      * In addition, if locking can be enabled, we need a complete set of
 242      * locking functions.
 243      */
 244     if (fnrandcnt != 3
 245             || fnctxcnt != 3
 246             || (fnenablelockcnt != 0 && fnenablelockcnt != 1)
 247             || (fnlockcnt != 0 && fnlockcnt != 2)
 248 #ifdef FIPS_MODULE
 249             || fnzeroizecnt != 1
 250 #endif
 251        ) {
 252         evp_rand_free(rand);
 253         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 254         return NULL;
 255     }
 256
 257     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 258         evp_rand_free(rand);
 259         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
 260         return NULL;
 261     }
 262     rand->prov = prov;
 263
 264     return rand;
 265 }
 266
 267 EVP_RAND *EVP_RAND_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
 268                          const char *properties)
 269 {
 270     return evp_generic_fetch(libctx, OSSL_OP_RAND, algorithm, properties,
 271                              evp_rand_from_dispatch, evp_rand_up_ref,
 272                              evp_rand_free);
 273 }
 274
 275 int EVP_RAND_up_ref(EVP_RAND *rand)
 276 {
 277     return evp_rand_up_ref(rand);
 278 }
 279
 280 void EVP_RAND_free(EVP_RAND *rand)
 281 {
 282     evp_rand_free(rand);
 283 }
 284
 285 int EVP_RAND_number(const EVP_RAND *rand)
 286 {
 287     return rand->name_id;
 288 }
 289
 290 const char *EVP_RAND_name(const EVP_RAND *rand)
 291 {
 292     return evp_first_name(rand->prov, rand->name_id);
 293 }
 294
 295 int EVP_RAND_is_a(const EVP_RAND *rand, const char *name)
 296 {
 297     return evp_is_a(rand->prov, rand->name_id, NULL, name);
 298 }
 299
 300 const OSSL_PROVIDER *EVP_RAND_provider(const EVP_RAND *rand)
 301 {
 302     return rand->prov;
 303 }
 304
 305 int EVP_RAND_get_params(EVP_RAND *rand, OSSL_PARAM params[])
 306 {
 307     if (rand->get_params != NULL)
 308         return rand->get_params(params);
 309     return 1;
 310 }
 311
 312 static int evp_rand_ctx_up_ref(EVP_RAND_CTX *ctx)
 313 {
 314     int ref = 0;
 315
 316     return CRYPTO_UP_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
 317 }
 318
 319 EVP_RAND_CTX *EVP_RAND_CTX_new(EVP_RAND *rand, EVP_RAND_CTX *parent)
 320 {
 321     EVP_RAND_CTX *ctx;
 322     void *parent_ctx = NULL;
 323     const OSSL_DISPATCH *parent_dispatch = NULL;
 324
 325     if (rand == NULL) {
 326         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
 327         return NULL;
 328     }
 329
 330     ctx = OPENSSL_zalloc(sizeof(*ctx));
 331     if (ctx == NULL || (ctx->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
 332         OPENSSL_free(ctx);
 333         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 334         return NULL;
 335     }
 336     if (parent != NULL) {
 337         if (!evp_rand_ctx_up_ref(parent)) {
 338             ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
 339             CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
 340             OPENSSL_free(ctx);
 341             return NULL;
 342         }
 343         parent_ctx = parent->data;
 344         parent_dispatch = parent->meth->dispatch;
 345     }
 346     if ((ctx->data = rand->newctx(ossl_provider_ctx(rand->prov), parent_ctx,
 347                                   parent_dispatch)) == NULL
 348             || !EVP_RAND_up_ref(rand)) {
 349         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 350         rand->freectx(ctx->data);
 351         CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
 352         OPENSSL_free(ctx);
 353         EVP_RAND_CTX_free(parent);
 354         return NULL;
 355     }
 356     ctx->meth = rand;
 357     ctx->parent = parent;
 358     ctx->refcnt = 1;
 359     return ctx;
 360 }
 361
 362 void EVP_RAND_CTX_free(EVP_RAND_CTX *ctx)
 363 {
 364     if (ctx != NULL) {
 365         int ref = 0;
 366
 367         CRYPTO_DOWN_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
 368         if (ref <= 0) {
 369             EVP_RAND_CTX *parent = ctx->parent;
 370
 371             ctx->meth->freectx(ctx->data);
 372             ctx->data = NULL;
 373             EVP_RAND_free(ctx->meth);
 374             CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
 375             OPENSSL_free(ctx);
 376             EVP_RAND_CTX_free(parent);
 377         }
 378     }
 379 }
 380
 381 EVP_RAND *EVP_RAND_CTX_rand(EVP_RAND_CTX *ctx)
 382 {
 383     return ctx->meth;
 384 }
 385
 386 static int evp_rand_get_ctx_params_locked(EVP_RAND_CTX *ctx,
 387                                           OSSL_PARAM params[])
 388 {
 389     return ctx->meth->get_ctx_params(ctx->data, params);
 390 }
 391
 392 int EVP_RAND_get_ctx_params(EVP_RAND_CTX *ctx, OSSL_PARAM params[])
 393 {
 394     int res;
 395
 396     if (!evp_rand_lock(ctx))
 397         return 0;
 398     res = evp_rand_get_ctx_params_locked(ctx, params);
 399     evp_rand_unlock(ctx);
 400     return res;
 401 }
 402
 403 static int evp_rand_set_ctx_params_locked(EVP_RAND_CTX *ctx,
 404                                           const OSSL_PARAM params[])
 405 {
 406     if (ctx->meth->set_ctx_params != NULL)
 407         return ctx->meth->set_ctx_params(ctx->data, params);
 408     return 1;
 409 }
 410
 411 int EVP_RAND_set_ctx_params(EVP_RAND_CTX *ctx, const OSSL_PARAM params[])
 412 {
 413     int res;
 414
 415     if (!evp_rand_lock(ctx))
 416         return 0;
 417     res = evp_rand_set_ctx_params_locked(ctx, params);
 418     evp_rand_unlock(ctx);
 419     return res;
 420 }
 421
 422 const OSSL_PARAM *EVP_RAND_gettable_params(const EVP_RAND *rand)
 423 {
 424     if (rand->gettable_params == NULL)
 425         return NULL;
 426     return rand->gettable_params(ossl_provider_ctx(EVP_RAND_provider(rand)));
 427 }
 428
 429 const OSSL_PARAM *EVP_RAND_gettable_ctx_params(const EVP_RAND *rand)
 430 {
 431     if (rand->gettable_ctx_params == NULL)
 432         return NULL;
 433     return rand->gettable_ctx_params(
 434                ossl_provider_ctx(EVP_RAND_provider(rand)));
 435 }
 436
 437 const OSSL_PARAM *EVP_RAND_settable_ctx_params(const EVP_RAND *rand)
 438 {
 439     if (rand->settable_ctx_params == NULL)
 440         return NULL;
 441     return rand->settable_ctx_params(
 442                ossl_provider_ctx(EVP_RAND_provider(rand)));
 443 }
 444
 445 void EVP_RAND_do_all_provided(OSSL_LIB_CTX *libctx,
 446                               void (*fn)(EVP_RAND *rand, void *arg),
 447                               void *arg)
 448 {
 449     evp_generic_do_all(libctx, OSSL_OP_RAND,
 450                        (void (*)(void *, void *))fn, arg,
 451                        evp_rand_from_dispatch, evp_rand_free);
 452 }
 453
 454 int EVP_RAND_names_do_all(const EVP_RAND *rand,
 455                           void (*fn)(const char *name, void *data),
 456                           void *data)
 457 {
 458     if (rand->prov != NULL)
 459         return evp_names_do_all(rand->prov, rand->name_id, fn, data);
 460
 461     return 1;
 462 }
 463
 464 static int evp_rand_instantiate_locked
 465     (EVP_RAND_CTX *ctx, unsigned int strength, int prediction_resistance,
 466      const unsigned char *pstr, size_t pstr_len)
 467 {
 468     return ctx->meth->instantiate(ctx->data, strength, prediction_resistance,
 469                                   pstr, pstr_len);
 470 }
 471
 472 int EVP_RAND_instantiate(EVP_RAND_CTX *ctx, unsigned int strength,
 473                          int prediction_resistance,
 474                          const unsigned char *pstr, size_t pstr_len)
 475 {
 476     int res;
 477
 478     if (!evp_rand_lock(ctx))
 479         return 0;
 480     res = evp_rand_instantiate_locked(ctx, strength, prediction_resistance,
 481                                       pstr, pstr_len);
 482     evp_rand_unlock(ctx);
 483     return res;
 484 }
 485
 486 static int evp_rand_uninstantiate_locked(EVP_RAND_CTX *ctx)
 487 {
 488     return ctx->meth->uninstantiate(ctx->data);
 489 }
 490
 491 int EVP_RAND_uninstantiate(EVP_RAND_CTX *ctx)
 492 {
 493     int res;
 494
 495     if (!evp_rand_lock(ctx))
 496         return 0;
 497     res = evp_rand_uninstantiate_locked(ctx);
 498     evp_rand_unlock(ctx);
 499     return res;
 500 }
 501
 502 static int evp_rand_generate_locked(EVP_RAND_CTX *ctx, unsigned char *out,
 503                                     size_t outlen, unsigned int strength,
 504                                     int prediction_resistance,
 505                                     const unsigned char *addin,
 506                                     size_t addin_len)
 507 {
 508     size_t chunk, max_request = 0;
 509     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 510
 511     params[0] = OSSL_PARAM_construct_size_t(OSSL_RAND_PARAM_MAX_REQUEST,
 512                                             &max_request);
 513     if (!evp_rand_get_ctx_params_locked(ctx, params)
 514             || max_request == 0) {
 515         ERR_raise(ERR_LIB_EVP, EVP_R_UNABLE_TO_GET_MAXIMUM_REQUEST_SIZE);
 516         return 0;
 517     }
 518     for (; outlen > 0; outlen -= chunk, out += chunk) {
 519         chunk = outlen > max_request ? max_request : outlen;
 520         if (!ctx->meth->generate(ctx->data, out, chunk, strength,
 521                                  prediction_resistance, addin, addin_len)) {
 522             ERR_raise(ERR_LIB_EVP, EVP_R_GENERATE_ERROR);
 523             return 0;
 524         }
 525         /*
 526          * Prediction resistance is only relevant the first time around,
 527          * subsequently, the DRBG has already been properly reseeded.
 528          */
 529         prediction_resistance = 0;
 530     }
 531     return 1;
 532 }
 533
 534 int EVP_RAND_generate(EVP_RAND_CTX *ctx, unsigned char *out, size_t outlen,
 535                       unsigned int strength, int prediction_resistance,
 536                       const unsigned char *addin, size_t addin_len)
 537 {
 538     int res;
 539
 540     if (!evp_rand_lock(ctx))
 541         return 0;
 542     res = evp_rand_generate_locked(ctx, out, outlen, strength,
 543                                    prediction_resistance, addin, addin_len);
 544     evp_rand_unlock(ctx);
 545     return res;
 546 }
 547
 548 static int evp_rand_reseed_locked(EVP_RAND_CTX *ctx, int prediction_resistance,
 549                                   const unsigned char *ent, size_t ent_len,
 550                                   const unsigned char *addin, size_t addin_len)
 551 {
 552     if (ctx->meth->reseed != NULL)
 553         return ctx->meth->reseed(ctx->data, prediction_resistance,
 554                                  ent, ent_len, addin, addin_len);
 555     return 1;
 556 }
 557
 558 int EVP_RAND_reseed(EVP_RAND_CTX *ctx, int prediction_resistance,
 559                     const unsigned char *ent, size_t ent_len,
 560                     const unsigned char *addin, size_t addin_len)
 561 {
 562     int res;
 563
 564     if (!evp_rand_lock(ctx))
 565         return 0;
 566     res = evp_rand_reseed_locked(ctx, prediction_resistance,
 567                                  ent, ent_len, addin, addin_len);
 568     evp_rand_unlock(ctx);
 569     return res;
 570 }
 571
 572 static unsigned int evp_rand_strength_locked(EVP_RAND_CTX *ctx)
 573 {
 574     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 575     unsigned int strength = 0;
 576
 577     params[0] = OSSL_PARAM_construct_uint(OSSL_RAND_PARAM_STRENGTH, &strength);
 578     if (!evp_rand_get_ctx_params_locked(ctx, params))
 579         return 0;
 580     return strength;
 581 }
 582
 583 unsigned int EVP_RAND_strength(EVP_RAND_CTX *ctx)
 584 {
 585     unsigned int res;
 586
 587     if (!evp_rand_lock(ctx))
 588         return 0;
 589     res = evp_rand_strength_locked(ctx);
 590     evp_rand_unlock(ctx);
 591     return res;
 592 }
 593
 594 static int evp_rand_nonce_locked(EVP_RAND_CTX *ctx, unsigned char *out,
 595                                  size_t outlen)
 596 {
 597     unsigned int str = evp_rand_strength_locked(ctx);
 598
 599     if (ctx->meth->nonce == NULL)
 600         return 0;
 601     if (ctx->meth->nonce(ctx->data, out, str, outlen, outlen))
 602         return 1;
 603     return evp_rand_generate_locked(ctx, out, outlen, str, 0, NULL, 0);
 604 }
 605
 606 int EVP_RAND_nonce(EVP_RAND_CTX *ctx, unsigned char *out, size_t outlen)
 607 {
 608     int res;
 609
 610     if (!evp_rand_lock(ctx))
 611         return 0;
 612     res = evp_rand_nonce_locked(ctx, out, outlen);
 613     evp_rand_unlock(ctx);
 614     return res;
 615 }
 616
 617 int EVP_RAND_state(EVP_RAND_CTX *ctx)
 618 {
 619     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 620     int state;
 621
 622     params[0] = OSSL_PARAM_construct_int(OSSL_RAND_PARAM_STATE, &state);
 623     if (!EVP_RAND_get_ctx_params(ctx, params))
 624         state = EVP_RAND_STATE_ERROR;
 625     return state;
 626 }
 627
 628 static int evp_rand_verify_zeroization_locked(EVP_RAND_CTX *ctx)
 629 {
 630     if (ctx->meth->verify_zeroization != NULL)
 631         return ctx->meth->verify_zeroization(ctx->data);
 632     return 0;
 633 }
 634
 635 int EVP_RAND_verify_zeroization(EVP_RAND_CTX *ctx)
 636 {
 637     int res;
 638
 639     if (!evp_rand_lock(ctx))
 640         return 0;
 641     res = evp_rand_verify_zeroization_locked(ctx);
 642     evp_rand_unlock(ctx);
 643     return res;
 644 }