crypto/rand/rand_lib.c

   1 /*
   2  * Copyright 1995-2020 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 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include <stdio.h>
  14 #include <time.h>
  15 #include <limits.h>
  16 #include <openssl/trace.h>
  17 #include <openssl/err.h>
  18 #include <openssl/conf.h>
  19 #include "internal/cryptlib.h"
  20 #include <openssl/opensslconf.h>
  21 #include "crypto/rand.h"
  22 #include "crypto/cryptlib.h"
  23 #include <openssl/engine.h>
  24 #include <openssl/core_names.h>
  25 #include "internal/thread_once.h"
  26 #include "rand_local.h"
  27 #include "e_os.h"
  28
  29 #ifndef FIPS_MODULE
  30 # include "prov/rand_pool.h"
  31 # include "prov/seeding.h"
  32
  33 # ifndef OPENSSL_NO_ENGINE
  34 /* non-NULL if default_RAND_meth is ENGINE-provided */
  35 static ENGINE *funct_ref;
  36 static CRYPTO_RWLOCK *rand_engine_lock;
  37 # endif
  38 static CRYPTO_RWLOCK *rand_meth_lock;
  39 static const RAND_METHOD *default_RAND_meth;
  40 static CRYPTO_ONCE rand_init = CRYPTO_ONCE_STATIC_INIT;
  41
  42 static int rand_inited = 0;
  43
  44 DEFINE_RUN_ONCE_STATIC(do_rand_init)
  45 {
  46 # ifndef OPENSSL_NO_ENGINE
  47     rand_engine_lock = CRYPTO_THREAD_lock_new();
  48     if (rand_engine_lock == NULL)
  49         return 0;
  50 # endif
  51
  52     rand_meth_lock = CRYPTO_THREAD_lock_new();
  53     if (rand_meth_lock == NULL)
  54         goto err;
  55
  56     if (!rand_pool_init())
  57         goto err;
  58
  59     rand_inited = 1;
  60     return 1;
  61
  62  err:
  63     CRYPTO_THREAD_lock_free(rand_meth_lock);
  64     rand_meth_lock = NULL;
  65 # ifndef OPENSSL_NO_ENGINE
  66     CRYPTO_THREAD_lock_free(rand_engine_lock);
  67     rand_engine_lock = NULL;
  68 # endif
  69     return 0;
  70 }
  71
  72 void rand_cleanup_int(void)
  73 {
  74     const RAND_METHOD *meth = default_RAND_meth;
  75
  76     if (!rand_inited)
  77         return;
  78
  79     if (meth != NULL && meth->cleanup != NULL)
  80         meth->cleanup();
  81     RAND_set_rand_method(NULL);
  82     rand_pool_cleanup();
  83 # ifndef OPENSSL_NO_ENGINE
  84     CRYPTO_THREAD_lock_free(rand_engine_lock);
  85     rand_engine_lock = NULL;
  86 # endif
  87     CRYPTO_THREAD_lock_free(rand_meth_lock);
  88     rand_meth_lock = NULL;
  89     rand_inited = 0;
  90 }
  91
  92 /*
  93  * RAND_close_seed_files() ensures that any seed file descriptors are
  94  * closed after use.  This only applies to libcrypto/default provider,
  95  * it does not apply to other providers.
  96  */
  97 void RAND_keep_random_devices_open(int keep)
  98 {
  99     if (RUN_ONCE(&rand_init, do_rand_init))
 100         rand_pool_keep_random_devices_open(keep);
 101 }
 102
 103 /*
 104  * RAND_poll() reseeds the default RNG using random input
 105  *
 106  * The random input is obtained from polling various entropy
 107  * sources which depend on the operating system and are
 108  * configurable via the --with-rand-seed configure option.
 109  */
 110 int RAND_poll(void)
 111 {
 112     const RAND_METHOD *meth = RAND_get_rand_method();
 113     int ret = meth == RAND_OpenSSL();
 114
 115     if (meth == NULL)
 116         return 0;
 117
 118 #ifndef OPENSSL_NO_DEPRECATED_3_0
 119     if (!ret) {
 120         /* fill random pool and seed the current legacy RNG */
 121         RAND_POOL *pool = rand_pool_new(RAND_DRBG_STRENGTH, 1,
 122                                         (RAND_DRBG_STRENGTH + 7) / 8,
 123                                         RAND_POOL_MAX_LENGTH);
 124
 125         if (pool == NULL)
 126             return 0;
 127
 128         if (prov_pool_acquire_entropy(pool) == 0)
 129             goto err;
 130
 131         if (meth->add == NULL
 132             || meth->add(rand_pool_buffer(pool),
 133                          rand_pool_length(pool),
 134                          (rand_pool_entropy(pool) / 8.0)) == 0)
 135             goto err;
 136
 137         ret = 1;
 138      err:
 139         rand_pool_free(pool);
 140     }
 141 #endif
 142     return ret;
 143 }
 144
 145 int RAND_set_rand_method(const RAND_METHOD *meth)
 146 {
 147     if (!RUN_ONCE(&rand_init, do_rand_init))
 148         return 0;
 149
 150     CRYPTO_THREAD_write_lock(rand_meth_lock);
 151 # ifndef OPENSSL_NO_ENGINE
 152     ENGINE_finish(funct_ref);
 153     funct_ref = NULL;
 154 # endif
 155     default_RAND_meth = meth;
 156     CRYPTO_THREAD_unlock(rand_meth_lock);
 157     return 1;
 158 }
 159
 160 const RAND_METHOD *RAND_get_rand_method(void)
 161 {
 162     const RAND_METHOD *tmp_meth = NULL;
 163
 164     if (!RUN_ONCE(&rand_init, do_rand_init))
 165         return NULL;
 166
 167     CRYPTO_THREAD_write_lock(rand_meth_lock);
 168     if (default_RAND_meth == NULL) {
 169 # ifndef OPENSSL_NO_ENGINE
 170         ENGINE *e;
 171
 172         /* If we have an engine that can do RAND, use it. */
 173         if ((e = ENGINE_get_default_RAND()) != NULL
 174                 && (tmp_meth = ENGINE_get_RAND(e)) != NULL) {
 175             funct_ref = e;
 176             default_RAND_meth = tmp_meth;
 177         } else {
 178             ENGINE_finish(e);
 179             default_RAND_meth = &rand_meth;
 180         }
 181 # else
 182         default_RAND_meth = &rand_meth;
 183 # endif
 184     }
 185     tmp_meth = default_RAND_meth;
 186     CRYPTO_THREAD_unlock(rand_meth_lock);
 187     return tmp_meth;
 188 }
 189
 190 # if !defined(OPENSSL_NO_ENGINE)
 191 int RAND_set_rand_engine(ENGINE *engine)
 192 {
 193     const RAND_METHOD *tmp_meth = NULL;
 194
 195     if (!RUN_ONCE(&rand_init, do_rand_init))
 196         return 0;
 197
 198     if (engine != NULL) {
 199         if (!ENGINE_init(engine))
 200             return 0;
 201         tmp_meth = ENGINE_get_RAND(engine);
 202         if (tmp_meth == NULL) {
 203             ENGINE_finish(engine);
 204             return 0;
 205         }
 206     }
 207     CRYPTO_THREAD_write_lock(rand_engine_lock);
 208     /* This function releases any prior ENGINE so call it first */
 209     RAND_set_rand_method(tmp_meth);
 210     funct_ref = engine;
 211     CRYPTO_THREAD_unlock(rand_engine_lock);
 212     return 1;
 213 }
 214 # endif
 215
 216 void RAND_seed(const void *buf, int num)
 217 {
 218     const RAND_METHOD *meth = RAND_get_rand_method();
 219
 220     if (meth != NULL && meth->seed != NULL)
 221         meth->seed(buf, num);
 222 }
 223
 224 void RAND_add(const void *buf, int num, double randomness)
 225 {
 226     const RAND_METHOD *meth = RAND_get_rand_method();
 227
 228     if (meth != NULL && meth->add != NULL)
 229         meth->add(buf, num, randomness);
 230 }
 231
 232 # if !defined(OPENSSL_NO_DEPRECATED_1_1_0)
 233 int RAND_pseudo_bytes(unsigned char *buf, int num)
 234 {
 235     const RAND_METHOD *meth = RAND_get_rand_method();
 236
 237     if (meth != NULL && meth->pseudorand != NULL)
 238         return meth->pseudorand(buf, num);
 239     RANDerr(RAND_F_RAND_PSEUDO_BYTES, RAND_R_FUNC_NOT_IMPLEMENTED);
 240     return -1;
 241 }
 242 # endif
 243
 244 int RAND_status(void)
 245 {
 246     EVP_RAND_CTX *rand;
 247     const RAND_METHOD *meth = RAND_get_rand_method();
 248
 249     if (meth != NULL && meth != RAND_OpenSSL())
 250         return meth->status != NULL ? meth->status() : 0;
 251
 252     if ((rand = RAND_get0_primary(NULL)) == NULL)
 253         return 0;
 254     return EVP_RAND_state(rand) == EVP_RAND_STATE_READY;
 255 }
 256 #else  /* !FIPS_MODULE */
 257
 258 const RAND_METHOD *RAND_get_rand_method(void)
 259 {
 260     return NULL;
 261 }
 262 #endif /* !FIPS_MODULE */
 263
 264 /*
 265  * This function is not part of RAND_METHOD, so if we're not using
 266  * the default method, then just call RAND_bytes().  Otherwise make
 267  * sure we're instantiated and use the private DRBG.
 268  */
 269 int RAND_priv_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, int num)
 270 {
 271     EVP_RAND_CTX *rand;
 272     const RAND_METHOD *meth = RAND_get_rand_method();
 273
 274     if (meth != NULL && meth != RAND_OpenSSL()) {
 275         if (meth->bytes != NULL)
 276             return meth->bytes(buf, num);
 277         RANDerr(RAND_F_RAND_PRIV_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
 278         return -1;
 279     }
 280
 281     rand = RAND_get0_private(ctx);
 282     if (rand != NULL)
 283         return EVP_RAND_generate(rand, buf, num, 0, 0, NULL, 0);
 284
 285     return 0;
 286 }
 287
 288 int RAND_priv_bytes(unsigned char *buf, int num)
 289 {
 290     return RAND_priv_bytes_ex(NULL, buf, num);
 291 }
 292
 293 int RAND_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, int num)
 294 {
 295     EVP_RAND_CTX *rand;
 296     const RAND_METHOD *meth = RAND_get_rand_method();
 297
 298     if (meth != NULL && meth != RAND_OpenSSL()) {
 299         if (meth->bytes != NULL)
 300             return meth->bytes(buf, num);
 301         RANDerr(RAND_F_RAND_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
 302         return -1;
 303     }
 304
 305     rand = RAND_get0_public(ctx);
 306     if (rand != NULL)
 307         return EVP_RAND_generate(rand, buf, num, 0, 0, NULL, 0);
 308
 309     return 0;
 310 }
 311
 312 int RAND_bytes(unsigned char *buf, int num)
 313 {
 314     return RAND_bytes_ex(NULL, buf, num);
 315 }
 316
 317 typedef struct rand_global_st {
 318     /*
 319      * The three shared DRBG instances
 320      *
 321      * There are three shared DRBG instances: <primary>, <public>, and
 322      * <private>.  The <public> and <private> DRBGs are secondary ones.
 323      * These are used for non-secret (e.g. nonces) and secret
 324      * (e.g. private keys) data respectively.
 325      */
 326     CRYPTO_RWLOCK *lock;
 327
 328     /*
 329      * The <primary> DRBG
 330      *
 331      * Not used directly by the application, only for reseeding the two other
 332      * DRBGs. It reseeds itself by pulling either randomness from os entropy
 333      * sources or by consuming randomness which was added by RAND_add().
 334      *
 335      * The <primary> DRBG is a global instance which is accessed concurrently by
 336      * all threads. The necessary locking is managed automatically by its child
 337      * DRBG instances during reseeding.
 338      */
 339     EVP_RAND_CTX *primary;
 340
 341     /*
 342      * The <public> DRBG
 343      *
 344      * Used by default for generating random bytes using RAND_bytes().
 345      *
 346      * The <public> secondary DRBG is thread-local, i.e., there is one instance
 347      * per thread.
 348      */
 349     CRYPTO_THREAD_LOCAL public;
 350
 351     /*
 352      * The <private> DRBG
 353      *
 354      * Used by default for generating private keys using RAND_priv_bytes()
 355      *
 356      * The <private> secondary DRBG is thread-local, i.e., there is one
 357      * instance per thread.
 358      */
 359     CRYPTO_THREAD_LOCAL private;
 360
 361     /* Which RNG is being used by default and it's configuration settings */
 362     char *rng_name;
 363     char *rng_cipher;
 364     char *rng_digest;
 365     char *rng_propq;
 366 } RAND_GLOBAL;
 367
 368 /*
 369  * Initialize the OSSL_LIB_CTX global DRBGs on first use.
 370  * Returns the allocated global data on success or NULL on failure.
 371  */
 372 static void *rand_ossl_ctx_new(OSSL_LIB_CTX *libctx)
 373 {
 374     RAND_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl));
 375
 376     if (dgbl == NULL)
 377         return NULL;
 378
 379 #ifndef FIPS_MODULE
 380     /*
 381      * We need to ensure that base libcrypto thread handling has been
 382      * initialised.
 383      */
 384      OPENSSL_init_crypto(0, NULL);
 385 #endif
 386
 387     dgbl->lock = CRYPTO_THREAD_lock_new();
 388     if (dgbl->lock == NULL)
 389         goto err1;
 390
 391     if (!CRYPTO_THREAD_init_local(&dgbl->private, NULL))
 392         goto err1;
 393
 394     if (!CRYPTO_THREAD_init_local(&dgbl->public, NULL))
 395         goto err2;
 396
 397     return dgbl;
 398
 399  err2:
 400     CRYPTO_THREAD_cleanup_local(&dgbl->private);
 401  err1:
 402     CRYPTO_THREAD_lock_free(dgbl->lock);
 403     OPENSSL_free(dgbl);
 404     return NULL;
 405 }
 406
 407 static void rand_ossl_ctx_free(void *vdgbl)
 408 {
 409     RAND_GLOBAL *dgbl = vdgbl;
 410
 411     if (dgbl == NULL)
 412         return;
 413
 414     CRYPTO_THREAD_lock_free(dgbl->lock);
 415     EVP_RAND_CTX_free(dgbl->primary);
 416     CRYPTO_THREAD_cleanup_local(&dgbl->private);
 417     CRYPTO_THREAD_cleanup_local(&dgbl->public);
 418     OPENSSL_free(dgbl->rng_name);
 419     OPENSSL_free(dgbl->rng_cipher);
 420     OPENSSL_free(dgbl->rng_digest);
 421     OPENSSL_free(dgbl->rng_propq);
 422
 423     OPENSSL_free(dgbl);
 424 }
 425
 426 static const OSSL_LIB_CTX_METHOD rand_drbg_ossl_ctx_method = {
 427     rand_ossl_ctx_new,
 428     rand_ossl_ctx_free,
 429 };
 430
 431 static RAND_GLOBAL *rand_get_global(OSSL_LIB_CTX *libctx)
 432 {
 433     return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_DRBG_INDEX,
 434                                  &rand_drbg_ossl_ctx_method);
 435 }
 436
 437 static void rand_delete_thread_state(void *arg)
 438 {
 439     OSSL_LIB_CTX *ctx = arg;
 440     RAND_GLOBAL *dgbl = rand_get_global(ctx);
 441     EVP_RAND_CTX *rand;
 442
 443     if (dgbl == NULL)
 444         return;
 445
 446     rand = CRYPTO_THREAD_get_local(&dgbl->public);
 447     CRYPTO_THREAD_set_local(&dgbl->public, NULL);
 448     EVP_RAND_CTX_free(rand);
 449
 450     rand = CRYPTO_THREAD_get_local(&dgbl->private);
 451     CRYPTO_THREAD_set_local(&dgbl->private, NULL);
 452     EVP_RAND_CTX_free(rand);
 453 }
 454
 455 static EVP_RAND_CTX *rand_new_drbg(OSSL_LIB_CTX *libctx, EVP_RAND_CTX *parent,
 456                                    unsigned int reseed_interval,
 457                                    time_t reseed_time_interval)
 458 {
 459     EVP_RAND *rand;
 460     RAND_GLOBAL *dgbl = rand_get_global(libctx);
 461     EVP_RAND_CTX *ctx;
 462     OSSL_PARAM params[7], *p = params;
 463     char *name, *cipher;
 464
 465     name = dgbl->rng_name != NULL ? dgbl->rng_name : "CTR-DRBG";
 466     rand = EVP_RAND_fetch(libctx, name, dgbl->rng_propq);
 467     if (rand == NULL) {
 468         RANDerr(0, RAND_R_UNABLE_TO_FETCH_DRBG);
 469         return NULL;
 470     }
 471     ctx = EVP_RAND_CTX_new(rand, parent);
 472     EVP_RAND_free(rand);
 473     if (ctx == NULL) {
 474         RANDerr(0, RAND_R_UNABLE_TO_CREATE_DRBG);
 475         return NULL;
 476     }
 477
 478     /*
 479      * Rather than trying to decode the DRBG settings, just pass them through
 480      * and rely on the other end to ignore those it doesn't care about.
 481      */
 482     cipher = dgbl->rng_cipher != NULL ? dgbl->rng_cipher : "AES-256-CTR";
 483     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
 484                                             cipher, 0);
 485     if (dgbl->rng_digest != NULL)
 486         *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST,
 487                                                 dgbl->rng_digest, 0);
 488     if (dgbl->rng_propq != NULL)
 489         *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_PROPERTIES,
 490                                                 dgbl->rng_propq, 0);
 491     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_MAC, "HMAC", 0);
 492     *p++ = OSSL_PARAM_construct_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS,
 493                                      &reseed_interval);
 494     *p++ = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL,
 495                                        &reseed_time_interval);
 496     *p = OSSL_PARAM_construct_end();
 497     if (!EVP_RAND_set_ctx_params(ctx, params)) {
 498         RANDerr(0, RAND_R_ERROR_INITIALISING_DRBG);
 499         EVP_RAND_CTX_free(ctx);
 500         return NULL;
 501     }
 502     if (!EVP_RAND_instantiate(ctx, 0, 0, NULL, 0)) {
 503         RANDerr(0, RAND_R_ERROR_INSTANTIATING_DRBG);
 504         EVP_RAND_CTX_free(ctx);
 505         return NULL;
 506     }
 507     return ctx;
 508 }
 509
 510 /*
 511  * Get the primary random generator.
 512  * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
 513  *
 514  */
 515 EVP_RAND_CTX *RAND_get0_primary(OSSL_LIB_CTX *ctx)
 516 {
 517     RAND_GLOBAL *dgbl = rand_get_global(ctx);
 518
 519     if (dgbl == NULL)
 520         return NULL;
 521
 522     if (dgbl->primary == NULL) {
 523         if (!CRYPTO_THREAD_write_lock(dgbl->lock))
 524             return NULL;
 525         if (dgbl->primary == NULL)
 526             dgbl->primary = rand_new_drbg(ctx, NULL, PRIMARY_RESEED_INTERVAL,
 527                                           PRIMARY_RESEED_TIME_INTERVAL);
 528         CRYPTO_THREAD_unlock(dgbl->lock);
 529     }
 530     return dgbl->primary;
 531 }
 532
 533 /*
 534  * Get the public random generator.
 535  * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
 536  */
 537 EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx)
 538 {
 539     RAND_GLOBAL *dgbl = rand_get_global(ctx);
 540     EVP_RAND_CTX *rand, *primary;
 541
 542     if (dgbl == NULL)
 543         return NULL;
 544
 545     rand = CRYPTO_THREAD_get_local(&dgbl->public);
 546     if (rand == NULL) {
 547         primary = RAND_get0_primary(ctx);
 548         if (primary == NULL)
 549             return NULL;
 550
 551         ctx = ossl_lib_ctx_get_concrete(ctx);
 552         /*
 553          * If the private is also NULL then this is the first time we've
 554          * used this thread.
 555          */
 556         if (CRYPTO_THREAD_get_local(&dgbl->private) == NULL
 557                 && !ossl_init_thread_start(NULL, ctx, rand_delete_thread_state))
 558             return NULL;
 559         rand = rand_new_drbg(ctx, primary, SECONDARY_RESEED_INTERVAL,
 560                              SECONDARY_RESEED_TIME_INTERVAL);
 561         CRYPTO_THREAD_set_local(&dgbl->public, rand);
 562     }
 563     return rand;
 564 }
 565
 566 /*
 567  * Get the private random generator.
 568  * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
 569  */
 570 EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx)
 571 {
 572     RAND_GLOBAL *dgbl = rand_get_global(ctx);
 573     EVP_RAND_CTX *rand, *primary;
 574
 575     if (dgbl == NULL)
 576         return NULL;
 577
 578     rand = CRYPTO_THREAD_get_local(&dgbl->private);
 579     if (rand == NULL) {
 580         primary = RAND_get0_primary(ctx);
 581         if (primary == NULL)
 582             return NULL;
 583
 584         ctx = ossl_lib_ctx_get_concrete(ctx);
 585         /*
 586          * If the public is also NULL then this is the first time we've
 587          * used this thread.
 588          */
 589         if (CRYPTO_THREAD_get_local(&dgbl->public) == NULL
 590                 && !ossl_init_thread_start(NULL, ctx, rand_delete_thread_state))
 591             return NULL;
 592         rand = rand_new_drbg(ctx, primary, SECONDARY_RESEED_INTERVAL,
 593                              SECONDARY_RESEED_TIME_INTERVAL);
 594         CRYPTO_THREAD_set_local(&dgbl->private, rand);
 595     }
 596     return rand;
 597 }
 598
 599 #ifndef FIPS_MODULE
 600 static int random_set_string(char **p, const char *s)
 601 {
 602     char *d = OPENSSL_strdup(s);
 603
 604     if (d == NULL) {
 605         CRYPTOerr(0, ERR_R_MALLOC_FAILURE);
 606         return 0;
 607     }
 608     OPENSSL_free(*p);
 609     *p = d;
 610     return 1;
 611 }
 612
 613 /*
 614  * Load the DRBG definitions from a configuration file.
 615  */
 616 static int random_conf_init(CONF_IMODULE *md, const CONF *cnf)
 617 {
 618     STACK_OF(CONF_VALUE) *elist;
 619     CONF_VALUE *cval;
 620     RAND_GLOBAL *dgbl = rand_get_global(cnf->libctx);
 621     int i, r = 1;
 622
 623     OSSL_TRACE1(CONF, "Loading random module: section %s\n",
 624                 CONF_imodule_get_value(md));
 625
 626     /* Value is a section containing RANDOM configuration */
 627     elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
 628     if (elist == NULL) {
 629         CRYPTOerr(0, CRYPTO_R_RANDOM_SECTION_ERROR);
 630         return 0;
 631     }
 632
 633     for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
 634         cval = sk_CONF_VALUE_value(elist, i);
 635         if (strcasecmp(cval->name, "random") == 0) {
 636             if (!random_set_string(&dgbl->rng_name, cval->value))
 637                 return 0;
 638         } else if (strcasecmp(cval->name, "cipher") == 0) {
 639             if (!random_set_string(&dgbl->rng_cipher, cval->value))
 640                 return 0;
 641         } else if (strcasecmp(cval->name, "digest") == 0) {
 642             if (!random_set_string(&dgbl->rng_digest, cval->value))
 643                 return 0;
 644         } else if (strcasecmp(cval->name, "properties") == 0) {
 645             if (!random_set_string(&dgbl->rng_propq, cval->value))
 646                 return 0;
 647         } else {
 648             CRYPTOerr(0, CRYPTO_R_UNKNOWN_NAME_IN_RANDOM_SECTION);
 649             ERR_add_error_data(4, "name=", cval->name, ", value=", cval->value);
 650             r = 0;
 651         }
 652     }
 653     return r;
 654 }
 655
 656
 657 static void random_conf_deinit(CONF_IMODULE *md)
 658 {
 659     OSSL_TRACE(CONF, "Cleaned up random\n");
 660 }
 661
 662 void ossl_random_add_conf_module(void)
 663 {
 664     OSSL_TRACE(CONF, "Adding config module 'random'\n");
 665     CONF_module_add("random", random_conf_init, random_conf_deinit);
 666 }
 667 #endif