/src/openssl30/crypto/evp/evp_rand.c

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/*
 * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/core.h>
#include <openssl/core_names.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include "internal/provider.h"
#include "internal/core.h"
#include "crypto/evp.h"
#include "evp_local.h"

struct evp_rand_st {
    OSSL_PROVIDER *prov;
    int name_id;
    char *type_name;
    const char *description;
    CRYPTO_REF_COUNT refcnt;
    CRYPTO_RWLOCK *refcnt_lock;

    const OSSL_DISPATCH *dispatch;
    OSSL_FUNC_rand_newctx_fn *newctx;
    OSSL_FUNC_rand_freectx_fn *freectx;
    OSSL_FUNC_rand_instantiate_fn *instantiate;
    OSSL_FUNC_rand_uninstantiate_fn *uninstantiate;
    OSSL_FUNC_rand_generate_fn *generate;
    OSSL_FUNC_rand_reseed_fn *reseed;
    OSSL_FUNC_rand_nonce_fn *nonce;
    OSSL_FUNC_rand_enable_locking_fn *enable_locking;
    OSSL_FUNC_rand_lock_fn *lock;
    OSSL_FUNC_rand_unlock_fn *unlock;
    OSSL_FUNC_rand_gettable_params_fn *gettable_params;
    OSSL_FUNC_rand_gettable_ctx_params_fn *gettable_ctx_params;
    OSSL_FUNC_rand_settable_ctx_params_fn *settable_ctx_params;
    OSSL_FUNC_rand_get_params_fn *get_params;
    OSSL_FUNC_rand_get_ctx_params_fn *get_ctx_params;
    OSSL_FUNC_rand_set_ctx_params_fn *set_ctx_params;
    OSSL_FUNC_rand_verify_zeroization_fn *verify_zeroization;
} /* EVP_RAND */ ;

static int evp_rand_up_ref(void *vrand)
{
    EVP_RAND *rand = (EVP_RAND *)vrand;
    int ref = 0;

    if (rand != NULL)
        return CRYPTO_UP_REF(&rand->refcnt, &ref, rand->refcnt_lock);
    return 1;
}

static void evp_rand_free(void *vrand)
{
    EVP_RAND *rand = (EVP_RAND *)vrand;
    int ref = 0;

    if (rand == NULL)
        return;
    CRYPTO_DOWN_REF(&rand->refcnt, &ref, rand->refcnt_lock);
    if (ref > 0)
        return;
    OPENSSL_free(rand->type_name);
    ossl_provider_free(rand->prov);
    CRYPTO_THREAD_lock_free(rand->refcnt_lock);
    OPENSSL_free(rand);
}

static void *evp_rand_new(void)
{
    EVP_RAND *rand = OPENSSL_zalloc(sizeof(*rand));

    if (rand == NULL
            || (rand->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
        OPENSSL_free(rand);
        return NULL;
    }
    rand->refcnt = 1;
    return rand;
}

/* Enable locking of the underlying DRBG/RAND if available */
int EVP_RAND_enable_locking(EVP_RAND_CTX *rand)
{
    if (rand->meth->enable_locking != NULL)
        return rand->meth->enable_locking(rand->algctx);
    ERR_raise(ERR_LIB_EVP, EVP_R_LOCKING_NOT_SUPPORTED);
    return 0;
}

/* Lock the underlying DRBG/RAND if available */
static int evp_rand_lock(EVP_RAND_CTX *rand)
{
    if (rand->meth->lock != NULL)
        return rand->meth->lock(rand->algctx);
    return 1;
}

/* Unlock the underlying DRBG/RAND if available */
static void evp_rand_unlock(EVP_RAND_CTX *rand)
{
    if (rand->meth->unlock != NULL)
        rand->meth->unlock(rand->algctx);
}

static void *evp_rand_from_algorithm(int name_id,
                                     const OSSL_ALGORITHM *algodef,
                                     OSSL_PROVIDER *prov)
{
    const OSSL_DISPATCH *fns = algodef->implementation;
    EVP_RAND *rand = NULL;
    int fnrandcnt = 0, fnctxcnt = 0, fnlockcnt = 0, fnenablelockcnt = 0;
#ifdef FIPS_MODULE
    int fnzeroizecnt = 0;
#endif

    if ((rand = evp_rand_new()) == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    rand->name_id = name_id;
    if ((rand->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
        evp_rand_free(rand);
        return NULL;
    }
    rand->description = algodef->algorithm_description;
    rand->dispatch = fns;
    for (; fns->function_id != 0; fns++) {
        switch (fns->function_id) {
        case OSSL_FUNC_RAND_NEWCTX:
            if (rand->newctx != NULL)
                break;
            rand->newctx = OSSL_FUNC_rand_newctx(fns);
            fnctxcnt++;
            break;
        case OSSL_FUNC_RAND_FREECTX:
            if (rand->freectx != NULL)
                break;
            rand->freectx = OSSL_FUNC_rand_freectx(fns);
            fnctxcnt++;
            break;
        case OSSL_FUNC_RAND_INSTANTIATE:
            if (rand->instantiate != NULL)
                break;
            rand->instantiate = OSSL_FUNC_rand_instantiate(fns);
            fnrandcnt++;
            break;
        case OSSL_FUNC_RAND_UNINSTANTIATE:
             if (rand->uninstantiate != NULL)
                break;
            rand->uninstantiate = OSSL_FUNC_rand_uninstantiate(fns);
            fnrandcnt++;
            break;
        case OSSL_FUNC_RAND_GENERATE:
            if (rand->generate != NULL)
                break;
            rand->generate = OSSL_FUNC_rand_generate(fns);
            fnrandcnt++;
            break;
        case OSSL_FUNC_RAND_RESEED:
            if (rand->reseed != NULL)
                break;
            rand->reseed = OSSL_FUNC_rand_reseed(fns);
            break;
        case OSSL_FUNC_RAND_NONCE:
            if (rand->nonce != NULL)
                break;
            rand->nonce = OSSL_FUNC_rand_nonce(fns);
            break;
        case OSSL_FUNC_RAND_ENABLE_LOCKING:
            if (rand->enable_locking != NULL)
                break;
            rand->enable_locking = OSSL_FUNC_rand_enable_locking(fns);
            fnenablelockcnt++;
            break;
        case OSSL_FUNC_RAND_LOCK:
            if (rand->lock != NULL)
                break;
            rand->lock = OSSL_FUNC_rand_lock(fns);
            fnlockcnt++;
            break;
        case OSSL_FUNC_RAND_UNLOCK:
            if (rand->unlock != NULL)
                break;
            rand->unlock = OSSL_FUNC_rand_unlock(fns);
            fnlockcnt++;
            break;
        case OSSL_FUNC_RAND_GETTABLE_PARAMS:
            if (rand->gettable_params != NULL)
                break;
            rand->gettable_params =
                OSSL_FUNC_rand_gettable_params(fns);
            break;
        case OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS:
            if (rand->gettable_ctx_params != NULL)
                break;
            rand->gettable_ctx_params =
                OSSL_FUNC_rand_gettable_ctx_params(fns);
            break;
        case OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS:
            if (rand->settable_ctx_params != NULL)
                break;
            rand->settable_ctx_params =
                OSSL_FUNC_rand_settable_ctx_params(fns);
            break;
        case OSSL_FUNC_RAND_GET_PARAMS:
            if (rand->get_params != NULL)
                break;
            rand->get_params = OSSL_FUNC_rand_get_params(fns);
            break;
        case OSSL_FUNC_RAND_GET_CTX_PARAMS:
            if (rand->get_ctx_params != NULL)
                break;
            rand->get_ctx_params = OSSL_FUNC_rand_get_ctx_params(fns);
            fnctxcnt++;
            break;
        case OSSL_FUNC_RAND_SET_CTX_PARAMS:
            if (rand->set_ctx_params != NULL)
                break;
            rand->set_ctx_params = OSSL_FUNC_rand_set_ctx_params(fns);
            break;
        case OSSL_FUNC_RAND_VERIFY_ZEROIZATION:
            if (rand->verify_zeroization != NULL)
                break;
            rand->verify_zeroization = OSSL_FUNC_rand_verify_zeroization(fns);
#ifdef FIPS_MODULE
            fnzeroizecnt++;
#endif
            break;
        }
    }
    /*
     * In order to be a consistent set of functions we must have at least
     * a complete set of "rand" functions and a complete set of context
     * management functions.  In FIPS mode, we also require the zeroization
     * verification function.
     *
     * In addition, if locking can be enabled, we need a complete set of
     * locking functions.
     */
    if (fnrandcnt != 3
            || fnctxcnt != 3
            || (fnenablelockcnt != 0 && fnenablelockcnt != 1)
            || (fnlockcnt != 0 && fnlockcnt != 2)
#ifdef FIPS_MODULE
            || fnzeroizecnt != 1
#endif
       ) {
        evp_rand_free(rand);
        ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
        return NULL;
    }

    if (prov != NULL && !ossl_provider_up_ref(prov)) {
        evp_rand_free(rand);
        ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
        return NULL;
    }
    rand->prov = prov;

    return rand;
}

EVP_RAND *EVP_RAND_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
                         const char *properties)
{
    return evp_generic_fetch(libctx, OSSL_OP_RAND, algorithm, properties,
                             evp_rand_from_algorithm, evp_rand_up_ref,
                             evp_rand_free);
}

int EVP_RAND_up_ref(EVP_RAND *rand)
{
    return evp_rand_up_ref(rand);
}

void EVP_RAND_free(EVP_RAND *rand)
{
    evp_rand_free(rand);
}

int evp_rand_get_number(const EVP_RAND *rand)
{
    return rand->name_id;
}

const char *EVP_RAND_get0_name(const EVP_RAND *rand)
{
    return rand->type_name;
}

const char *EVP_RAND_get0_description(const EVP_RAND *rand)
{
    return rand->description;
}

int EVP_RAND_is_a(const EVP_RAND *rand, const char *name)
{
    return rand != NULL && evp_is_a(rand->prov, rand->name_id, NULL, name);
}

const OSSL_PROVIDER *EVP_RAND_get0_provider(const EVP_RAND *rand)
{
    return rand->prov;
}

int EVP_RAND_get_params(EVP_RAND *rand, OSSL_PARAM params[])
{
    if (rand->get_params != NULL)
        return rand->get_params(params);
    return 1;
}

static int evp_rand_ctx_up_ref(EVP_RAND_CTX *ctx)
{
    int ref = 0;

    return CRYPTO_UP_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
}

EVP_RAND_CTX *EVP_RAND_CTX_new(EVP_RAND *rand, EVP_RAND_CTX *parent)
{
    EVP_RAND_CTX *ctx;
    void *parent_ctx = NULL;
    const OSSL_DISPATCH *parent_dispatch = NULL;

    if (rand == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
        return NULL;
    }

    ctx = OPENSSL_zalloc(sizeof(*ctx));
    if (ctx == NULL || (ctx->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
        OPENSSL_free(ctx);
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    if (parent != NULL) {
        if (!evp_rand_ctx_up_ref(parent)) {
            ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
            CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
            OPENSSL_free(ctx);
            return NULL;
        }
        parent_ctx = parent->algctx;
        parent_dispatch = parent->meth->dispatch;
    }
    if ((ctx->algctx = rand->newctx(ossl_provider_ctx(rand->prov), parent_ctx,
                                    parent_dispatch)) == NULL
            || !EVP_RAND_up_ref(rand)) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        rand->freectx(ctx->algctx);
        CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
        OPENSSL_free(ctx);
        EVP_RAND_CTX_free(parent);
        return NULL;
    }
    ctx->meth = rand;
    ctx->parent = parent;
    ctx->refcnt = 1;
    return ctx;
}

void EVP_RAND_CTX_free(EVP_RAND_CTX *ctx)
{
    int ref = 0;
    EVP_RAND_CTX *parent;

    if (ctx == NULL)
        return;

    CRYPTO_DOWN_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
    if (ref > 0)
        return;
    parent = ctx->parent;
    ctx->meth->freectx(ctx->algctx);
    ctx->algctx = NULL;
    EVP_RAND_free(ctx->meth);
    CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
    OPENSSL_free(ctx);
    EVP_RAND_CTX_free(parent);
}

EVP_RAND *EVP_RAND_CTX_get0_rand(EVP_RAND_CTX *ctx)
{
    return ctx->meth;
}

static int evp_rand_get_ctx_params_locked(EVP_RAND_CTX *ctx,
                                          OSSL_PARAM params[])
{
    return ctx->meth->get_ctx_params(ctx->algctx, params);
}

int EVP_RAND_CTX_get_params(EVP_RAND_CTX *ctx, OSSL_PARAM params[])
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_get_ctx_params_locked(ctx, params);
    evp_rand_unlock(ctx);
    return res;
}

static int evp_rand_set_ctx_params_locked(EVP_RAND_CTX *ctx,
                                          const OSSL_PARAM params[])
{
    if (ctx->meth->set_ctx_params != NULL)
        return ctx->meth->set_ctx_params(ctx->algctx, params);
    return 1;
}

int EVP_RAND_CTX_set_params(EVP_RAND_CTX *ctx, const OSSL_PARAM params[])
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_set_ctx_params_locked(ctx, params);
    evp_rand_unlock(ctx);
    return res;
}

const OSSL_PARAM *EVP_RAND_gettable_params(const EVP_RAND *rand)
{
    if (rand->gettable_params == NULL)
        return NULL;
    return rand->gettable_params(ossl_provider_ctx(EVP_RAND_get0_provider(rand)));
}

const OSSL_PARAM *EVP_RAND_gettable_ctx_params(const EVP_RAND *rand)
{
    void *provctx;

    if (rand->gettable_ctx_params == NULL)
        return NULL;
    provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
    return rand->gettable_ctx_params(NULL, provctx);
}

const OSSL_PARAM *EVP_RAND_settable_ctx_params(const EVP_RAND *rand)
{
    void *provctx;

    if (rand->settable_ctx_params == NULL)
        return NULL;
    provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
    return rand->settable_ctx_params(NULL, provctx);
}

const OSSL_PARAM *EVP_RAND_CTX_gettable_params(EVP_RAND_CTX *ctx)
{
    void *provctx;

    if (ctx->meth->gettable_ctx_params == NULL)
        return NULL;
    provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
    return ctx->meth->gettable_ctx_params(ctx->algctx, provctx);
}

const OSSL_PARAM *EVP_RAND_CTX_settable_params(EVP_RAND_CTX *ctx)
{
    void *provctx;

    if (ctx->meth->settable_ctx_params == NULL)
        return NULL;
    provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
    return ctx->meth->settable_ctx_params(ctx->algctx, provctx);
}

void EVP_RAND_do_all_provided(OSSL_LIB_CTX *libctx,
                              void (*fn)(EVP_RAND *rand, void *arg),
                              void *arg)
{
    evp_generic_do_all(libctx, OSSL_OP_RAND,
                       (void (*)(void *, void *))fn, arg,
                       evp_rand_from_algorithm, evp_rand_up_ref,
                       evp_rand_free);
}

int EVP_RAND_names_do_all(const EVP_RAND *rand,
                          void (*fn)(const char *name, void *data),
                          void *data)
{
    if (rand->prov != NULL)
        return evp_names_do_all(rand->prov, rand->name_id, fn, data);

    return 1;
}

static int evp_rand_instantiate_locked
    (EVP_RAND_CTX *ctx, unsigned int strength, int prediction_resistance,
     const unsigned char *pstr, size_t pstr_len, const OSSL_PARAM params[])
{
    return ctx->meth->instantiate(ctx->algctx, strength, prediction_resistance,
                                  pstr, pstr_len, params);
}

int EVP_RAND_instantiate(EVP_RAND_CTX *ctx, unsigned int strength,
                         int prediction_resistance,
                         const unsigned char *pstr, size_t pstr_len,
                         const OSSL_PARAM params[])
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_instantiate_locked(ctx, strength, prediction_resistance,
                                      pstr, pstr_len, params);
    evp_rand_unlock(ctx);
    return res;
}

static int evp_rand_uninstantiate_locked(EVP_RAND_CTX *ctx)
{
    return ctx->meth->uninstantiate(ctx->algctx);
}

int EVP_RAND_uninstantiate(EVP_RAND_CTX *ctx)
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_uninstantiate_locked(ctx);
    evp_rand_unlock(ctx);
    return res;
}

static int evp_rand_generate_locked(EVP_RAND_CTX *ctx, unsigned char *out,
                                    size_t outlen, unsigned int strength,
                                    int prediction_resistance,
                                    const unsigned char *addin,
                                    size_t addin_len)
{
    size_t chunk, max_request = 0;
    OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };

    params[0] = OSSL_PARAM_construct_size_t(OSSL_RAND_PARAM_MAX_REQUEST,
                                            &max_request);
    if (!evp_rand_get_ctx_params_locked(ctx, params)
            || max_request == 0) {
        ERR_raise(ERR_LIB_EVP, EVP_R_UNABLE_TO_GET_MAXIMUM_REQUEST_SIZE);
        return 0;
    }
    for (; outlen > 0; outlen -= chunk, out += chunk) {
        chunk = outlen > max_request ? max_request : outlen;
        if (!ctx->meth->generate(ctx->algctx, out, chunk, strength,
                                 prediction_resistance, addin, addin_len)) {
            ERR_raise(ERR_LIB_EVP, EVP_R_GENERATE_ERROR);
            return 0;
        }
        /*
         * Prediction resistance is only relevant the first time around,
         * subsequently, the DRBG has already been properly reseeded.
         */
        prediction_resistance = 0;
    }
    return 1;
}

int EVP_RAND_generate(EVP_RAND_CTX *ctx, unsigned char *out, size_t outlen,
                      unsigned int strength, int prediction_resistance,
                      const unsigned char *addin, size_t addin_len)
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_generate_locked(ctx, out, outlen, strength,
                                   prediction_resistance, addin, addin_len);
    evp_rand_unlock(ctx);
    return res;
}

static int evp_rand_reseed_locked(EVP_RAND_CTX *ctx, int prediction_resistance,
                                  const unsigned char *ent, size_t ent_len,
                                  const unsigned char *addin, size_t addin_len)
{
    if (ctx->meth->reseed != NULL)
        return ctx->meth->reseed(ctx->algctx, prediction_resistance,
                                 ent, ent_len, addin, addin_len);
    return 1;
}

int EVP_RAND_reseed(EVP_RAND_CTX *ctx, int prediction_resistance,
                    const unsigned char *ent, size_t ent_len,
                    const unsigned char *addin, size_t addin_len)
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_reseed_locked(ctx, prediction_resistance,
                                 ent, ent_len, addin, addin_len);
    evp_rand_unlock(ctx);
    return res;
}

static unsigned int evp_rand_strength_locked(EVP_RAND_CTX *ctx)
{
    OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
    unsigned int strength = 0;

    params[0] = OSSL_PARAM_construct_uint(OSSL_RAND_PARAM_STRENGTH, &strength);
    if (!evp_rand_get_ctx_params_locked(ctx, params))
        return 0;
    return strength;
}

unsigned int EVP_RAND_get_strength(EVP_RAND_CTX *ctx)
{
    unsigned int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_strength_locked(ctx);
    evp_rand_unlock(ctx);
    return res;
}

static int evp_rand_nonce_locked(EVP_RAND_CTX *ctx, unsigned char *out,
                                 size_t outlen)
{
    unsigned int str = evp_rand_strength_locked(ctx);

    if (ctx->meth->nonce != NULL)
        return ctx->meth->nonce(ctx->algctx, out, str, outlen, outlen) > 0;
    return evp_rand_generate_locked(ctx, out, outlen, str, 0, NULL, 0);
}

int EVP_RAND_nonce(EVP_RAND_CTX *ctx, unsigned char *out, size_t outlen)
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_nonce_locked(ctx, out, outlen);
    evp_rand_unlock(ctx);
    return res;
}

int EVP_RAND_get_state(EVP_RAND_CTX *ctx)
{
    OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
    int state;

    params[0] = OSSL_PARAM_construct_int(OSSL_RAND_PARAM_STATE, &state);
    if (!EVP_RAND_CTX_get_params(ctx, params))
        state = EVP_RAND_STATE_ERROR;
    return state;
}

static int evp_rand_verify_zeroization_locked(EVP_RAND_CTX *ctx)
{
    if (ctx->meth->verify_zeroization != NULL)
        return ctx->meth->verify_zeroization(ctx->algctx);
    return 0;
}

int EVP_RAND_verify_zeroization(EVP_RAND_CTX *ctx)
{
    int res;

    if (!evp_rand_lock(ctx))
        return 0;
    res = evp_rand_verify_zeroization_locked(ctx);
    evp_rand_unlock(ctx);
    return res;
}

Coverage Report

Created: 2025-06-13 06:58

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2020-2022 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 <stdio.h>
11		#include <stdlib.h>
12		#include <openssl/evp.h>
13		#include <openssl/rand.h>
14		#include <openssl/core.h>
15		#include <openssl/core_names.h>
16		#include <openssl/crypto.h>
17		#include "internal/cryptlib.h"
18		#include "internal/numbers.h"
19		#include "internal/provider.h"
20		#include "internal/core.h"
21		#include "crypto/evp.h"
22		#include "evp_local.h"
23
24		struct evp_rand_st {
25		OSSL_PROVIDER *prov;
26		int name_id;
27		char *type_name;
28		const char *description;
29		CRYPTO_REF_COUNT refcnt;
30		CRYPTO_RWLOCK *refcnt_lock;
31
32		const OSSL_DISPATCH *dispatch;
33		OSSL_FUNC_rand_newctx_fn *newctx;
34		OSSL_FUNC_rand_freectx_fn *freectx;
35		OSSL_FUNC_rand_instantiate_fn *instantiate;
36		OSSL_FUNC_rand_uninstantiate_fn *uninstantiate;
37		OSSL_FUNC_rand_generate_fn *generate;
38		OSSL_FUNC_rand_reseed_fn *reseed;
39		OSSL_FUNC_rand_nonce_fn *nonce;
40		OSSL_FUNC_rand_enable_locking_fn *enable_locking;
41		OSSL_FUNC_rand_lock_fn *lock;
42		OSSL_FUNC_rand_unlock_fn *unlock;
43		OSSL_FUNC_rand_gettable_params_fn *gettable_params;
44		OSSL_FUNC_rand_gettable_ctx_params_fn *gettable_ctx_params;
45		OSSL_FUNC_rand_settable_ctx_params_fn *settable_ctx_params;
46		OSSL_FUNC_rand_get_params_fn *get_params;
47		OSSL_FUNC_rand_get_ctx_params_fn *get_ctx_params;
48		OSSL_FUNC_rand_set_ctx_params_fn *set_ctx_params;
49		OSSL_FUNC_rand_verify_zeroization_fn *verify_zeroization;
50		} /* EVP_RAND */ ;
51
52		static int evp_rand_up_ref(void *vrand)
53	771	{
54	771	EVP_RAND rand = (EVP_RAND )vrand;
55	771	int ref = 0;
56
57	771	if (rand != NULL)
58	771	return CRYPTO_UP_REF(&rand->refcnt, &ref, rand->refcnt_lock);
59	0	return 1;
60	771	}
61
62		static void evp_rand_free(void *vrand)
63	970	{
64	970	EVP_RAND rand = (EVP_RAND )vrand;
65	970	int ref = 0;
66
67	970	if (rand == NULL)
68	0	return;
69	970	CRYPTO_DOWN_REF(&rand->refcnt, &ref, rand->refcnt_lock);
70	970	if (ref > 0)
71	761	return;
72	209	OPENSSL_free(rand->type_name);
73	209	ossl_provider_free(rand->prov);
74	209	CRYPTO_THREAD_lock_free(rand->refcnt_lock);
75	209	OPENSSL_free(rand);
76	209	}
77
78		static void *evp_rand_new(void)
79	70	{
80	70	EVP_RAND rand = OPENSSL_zalloc(sizeof(rand));
81
82	70	if (rand == NULL
83	70	\|\| (rand->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
84	0	OPENSSL_free(rand);
85	0	return NULL;
86	0	}
87	70	rand->refcnt = 1;
88	70	return rand;
89	70	}
90
91		/* Enable locking of the underlying DRBG/RAND if available */
92		int EVP_RAND_enable_locking(EVP_RAND_CTX *rand)
93	36	{
94	36	if (rand->meth->enable_locking != NULL)
95	36	return rand->meth->enable_locking(rand->algctx);
96	36	ERR_raise(ERR_LIB_EVP, EVP_R_LOCKING_NOT_SUPPORTED);
97	0	return 0;
98	36	}
99
100		/* Lock the underlying DRBG/RAND if available */
101		static int evp_rand_lock(EVP_RAND_CTX *rand)
102	1.19M	{
103	1.19M	if (rand->meth->lock != NULL)
104	82.1k	return rand->meth->lock(rand->algctx);
105	1.10M	return 1;
106	1.19M	}
107
108		/* Unlock the underlying DRBG/RAND if available */
109		static void evp_rand_unlock(EVP_RAND_CTX *rand)
110	1.19M	{
111	1.19M	if (rand->meth->unlock != NULL)
112	82.1k	rand->meth->unlock(rand->algctx);
113	1.19M	}
114
115		static void *evp_rand_from_algorithm(int name_id,
116		const OSSL_ALGORITHM *algodef,
117		OSSL_PROVIDER *prov)
118	35	{
119	35	const OSSL_DISPATCH *fns = algodef->implementation;
120	35	EVP_RAND *rand = NULL;
121	35	int fnrandcnt = 0, fnctxcnt = 0, fnlockcnt = 0, fnenablelockcnt = 0;
122		#ifdef FIPS_MODULE
123		int fnzeroizecnt = 0;
124		#endif
125
126	35	if ((rand = evp_rand_new()) == NULL) {
127	0	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
128	0	return NULL;
129	0	}
130	35	rand->name_id = name_id;
131	35	if ((rand->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
132	0	evp_rand_free(rand);
133	0	return NULL;
134	0	}
135	35	rand->description = algodef->algorithm_description;
136	35	rand->dispatch = fns;
137	543	for (; fns->function_id != 0; fns++) {
138	508	switch (fns->function_id) {
139	35	case OSSL_FUNC_RAND_NEWCTX:
140	35	if (rand->newctx != NULL)
141	0	break;
142	35	rand->newctx = OSSL_FUNC_rand_newctx(fns);
143	35	fnctxcnt++;
144	35	break;
145	35	case OSSL_FUNC_RAND_FREECTX:
146	35	if (rand->freectx != NULL)
147	0	break;
148	35	rand->freectx = OSSL_FUNC_rand_freectx(fns);
149	35	fnctxcnt++;
150	35	break;
151	35	case OSSL_FUNC_RAND_INSTANTIATE:
152	35	if (rand->instantiate != NULL)
153	0	break;
154	35	rand->instantiate = OSSL_FUNC_rand_instantiate(fns);
155	35	fnrandcnt++;
156	35	break;
157	35	case OSSL_FUNC_RAND_UNINSTANTIATE:
158	35	if (rand->uninstantiate != NULL)
159	0	break;
160	35	rand->uninstantiate = OSSL_FUNC_rand_uninstantiate(fns);
161	35	fnrandcnt++;
162	35	break;
163	35	case OSSL_FUNC_RAND_GENERATE:
164	35	if (rand->generate != NULL)
165	0	break;
166	35	rand->generate = OSSL_FUNC_rand_generate(fns);
167	35	fnrandcnt++;
168	35	break;
169	30	case OSSL_FUNC_RAND_RESEED:
170	30	if (rand->reseed != NULL)
171	0	break;
172	30	rand->reseed = OSSL_FUNC_rand_reseed(fns);
173	30	break;
174	6	case OSSL_FUNC_RAND_NONCE:
175	6	if (rand->nonce != NULL)
176	0	break;
177	6	rand->nonce = OSSL_FUNC_rand_nonce(fns);
178	6	break;
179	35	case OSSL_FUNC_RAND_ENABLE_LOCKING:
180	35	if (rand->enable_locking != NULL)
181	0	break;
182	35	rand->enable_locking = OSSL_FUNC_rand_enable_locking(fns);
183	35	fnenablelockcnt++;
184	35	break;
185	30	case OSSL_FUNC_RAND_LOCK:
186	30	if (rand->lock != NULL)
187	0	break;
188	30	rand->lock = OSSL_FUNC_rand_lock(fns);
189	30	fnlockcnt++;
190	30	break;
191	30	case OSSL_FUNC_RAND_UNLOCK:
192	30	if (rand->unlock != NULL)
193	0	break;
194	30	rand->unlock = OSSL_FUNC_rand_unlock(fns);
195	30	fnlockcnt++;
196	30	break;
197	0	case OSSL_FUNC_RAND_GETTABLE_PARAMS:
198	0	if (rand->gettable_params != NULL)
199	0	break;
200	0	rand->gettable_params =
201	0	OSSL_FUNC_rand_gettable_params(fns);
202	0	break;
203	35	case OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS:
204	35	if (rand->gettable_ctx_params != NULL)
205	0	break;
206	35	rand->gettable_ctx_params =
207	35	OSSL_FUNC_rand_gettable_ctx_params(fns);
208	35	break;
209	24	case OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS:
210	24	if (rand->settable_ctx_params != NULL)
211	0	break;
212	24	rand->settable_ctx_params =
213	24	OSSL_FUNC_rand_settable_ctx_params(fns);
214	24	break;
215	0	case OSSL_FUNC_RAND_GET_PARAMS:
216	0	if (rand->get_params != NULL)
217	0	break;
218	0	rand->get_params = OSSL_FUNC_rand_get_params(fns);
219	0	break;
220	35	case OSSL_FUNC_RAND_GET_CTX_PARAMS:
221	35	if (rand->get_ctx_params != NULL)
222	0	break;
223	35	rand->get_ctx_params = OSSL_FUNC_rand_get_ctx_params(fns);
224	35	fnctxcnt++;
225	35	break;
226	24	case OSSL_FUNC_RAND_SET_CTX_PARAMS:
227	24	if (rand->set_ctx_params != NULL)
228	0	break;
229	24	rand->set_ctx_params = OSSL_FUNC_rand_set_ctx_params(fns);
230	24	break;
231	30	case OSSL_FUNC_RAND_VERIFY_ZEROIZATION:
232	30	if (rand->verify_zeroization != NULL)
233	0	break;
234	30	rand->verify_zeroization = OSSL_FUNC_rand_verify_zeroization(fns);
235		#ifdef FIPS_MODULE
236		fnzeroizecnt++;
237		#endif
238	30	break;
239	508	}
240	508	}
241		/*
242		* In order to be a consistent set of functions we must have at least
243		* a complete set of "rand" functions and a complete set of context
244		* management functions. In FIPS mode, we also require the zeroization
245		* verification function.
246		*
247		* In addition, if locking can be enabled, we need a complete set of
248		* locking functions.
249		*/
250	35	if (fnrandcnt != 3
251	35	\|\| fnctxcnt != 3
252	35	\|\| (fnenablelockcnt != 0 && fnenablelockcnt != 1)
253	35	\|\| (fnlockcnt != 0 && fnlockcnt != 2)
254		#ifdef FIPS_MODULE
255		\|\| fnzeroizecnt != 1
256		#endif
257	35	) {
258	0	evp_rand_free(rand);
259	0	ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
260	0	return NULL;
261	0	}
262
263	35	if (prov != NULL && !ossl_provider_up_ref(prov)) {
264	0	evp_rand_free(rand);
265	0	ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
266	0	return NULL;
267	0	}
268	35	rand->prov = prov;
269
270	35	return rand;
271	35	}
272
273		EVP_RAND EVP_RAND_fetch(OSSL_LIB_CTX libctx, const char *algorithm,
274		const char *properties)
275	128	{
276	128	return evp_generic_fetch(libctx, OSSL_OP_RAND, algorithm, properties,
277	128	evp_rand_from_algorithm, evp_rand_up_ref,
278	128	evp_rand_free);
279	128	}
280
281		int EVP_RAND_up_ref(EVP_RAND *rand)
282	352	{
283	352	return evp_rand_up_ref(rand);
284	352	}
285
286		void EVP_RAND_free(EVP_RAND *rand)
287	470	{
288	470	evp_rand_free(rand);
289	470	}
290
291		int evp_rand_get_number(const EVP_RAND *rand)
292	0	{
293	0	return rand->name_id;
294	0	}
295
296		const char EVP_RAND_get0_name(const EVP_RAND rand)
297	0	{
298	0	return rand->type_name;
299	0	}
300
301		const char EVP_RAND_get0_description(const EVP_RAND rand)
302	0	{
303	0	return rand->description;
304	0	}
305
306		int EVP_RAND_is_a(const EVP_RAND rand, const char name)
307	0	{
308	0	return rand != NULL && evp_is_a(rand->prov, rand->name_id, NULL, name);
309	0	}
310
311		const OSSL_PROVIDER EVP_RAND_get0_provider(const EVP_RAND rand)
312	268	{
313	268	return rand->prov;
314	268	}
315
316		int EVP_RAND_get_params(EVP_RAND *rand, OSSL_PARAM params[])
317	0	{
318	0	if (rand->get_params != NULL)
319	0	return rand->get_params(params);
320	0	return 1;
321	0	}
322
323		static int evp_rand_ctx_up_ref(EVP_RAND_CTX *ctx)
324	15	{
325	15	int ref = 0;
326
327	15	return CRYPTO_UP_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
328	15	}
329
330		EVP_RAND_CTX EVP_RAND_CTX_new(EVP_RAND rand, EVP_RAND_CTX *parent)
331	42	{
332	42	EVP_RAND_CTX *ctx;
333	42	void *parent_ctx = NULL;
334	42	const OSSL_DISPATCH *parent_dispatch = NULL;
335
336	42	if (rand == NULL) {
337	0	ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
338	0	return NULL;
339	0	}
340
341	42	ctx = OPENSSL_zalloc(sizeof(*ctx));
342	42	if (ctx == NULL \|\| (ctx->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
343	0	OPENSSL_free(ctx);
344	0	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
345	0	return NULL;
346	0	}
347	42	if (parent != NULL) {
348	30	if (!evp_rand_ctx_up_ref(parent)) {
349	0	ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
350	0	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
351	0	OPENSSL_free(ctx);
352	0	return NULL;
353	0	}
354	30	parent_ctx = parent->algctx;
355	30	parent_dispatch = parent->meth->dispatch;
356	30	}
357	42	if ((ctx->algctx = rand->newctx(ossl_provider_ctx(rand->prov), parent_ctx,
358	42	parent_dispatch)) == NULL
359	42	\|\| !EVP_RAND_up_ref(rand)) {
360	0	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
361	0	rand->freectx(ctx->algctx);
362	0	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
363	0	OPENSSL_free(ctx);
364	0	EVP_RAND_CTX_free(parent);
365	0	return NULL;
366	0	}
367	42	ctx->meth = rand;
368	42	ctx->parent = parent;
369	42	ctx->refcnt = 1;
370	42	return ctx;
371	42	}
372
373		void EVP_RAND_CTX_free(EVP_RAND_CTX *ctx)
374	848	{
375	848	int ref = 0;
376	848	EVP_RAND_CTX *parent;
377
378	848	if (ctx == NULL)
379	414	return;
380
381	434	CRYPTO_DOWN_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
382	434	if (ref > 0)
383	92	return;
384	342	parent = ctx->parent;
385	342	ctx->meth->freectx(ctx->algctx);
386	342	ctx->algctx = NULL;
387	342	EVP_RAND_free(ctx->meth);
388	342	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
389	342	OPENSSL_free(ctx);
390	342	EVP_RAND_CTX_free(parent);
391	342	}
392
393		EVP_RAND EVP_RAND_CTX_get0_rand(EVP_RAND_CTX ctx)
394	0	{
395	0	return ctx->meth;
396	0	}
397
398		static int evp_rand_get_ctx_params_locked(EVP_RAND_CTX *ctx,
399		OSSL_PARAM params[])
400	1.19M	{
401	1.19M	return ctx->meth->get_ctx_params(ctx->algctx, params);
402	1.19M	}
403
404		int EVP_RAND_CTX_get_params(EVP_RAND_CTX *ctx, OSSL_PARAM params[])
405	0	{
406	0	int res;
407
408	0	if (!evp_rand_lock(ctx))
409	0	return 0;
410	0	res = evp_rand_get_ctx_params_locked(ctx, params);
411	0	evp_rand_unlock(ctx);
412	0	return res;
413	0	}
414
415		static int evp_rand_set_ctx_params_locked(EVP_RAND_CTX *ctx,
416		const OSSL_PARAM params[])
417	214	{
418	214	if (ctx->meth->set_ctx_params != NULL)
419	213	return ctx->meth->set_ctx_params(ctx->algctx, params);
420	1	return 1;
421	214	}
422
423		int EVP_RAND_CTX_set_params(EVP_RAND_CTX *ctx, const OSSL_PARAM params[])
424	214	{
425	214	int res;
426
427	214	if (!evp_rand_lock(ctx))
428	0	return 0;
429	214	res = evp_rand_set_ctx_params_locked(ctx, params);
430	214	evp_rand_unlock(ctx);
431	214	return res;
432	214	}
433
434		const OSSL_PARAM EVP_RAND_gettable_params(const EVP_RAND rand)
435	0	{
436	0	if (rand->gettable_params == NULL)
437	0	return NULL;
438	0	return rand->gettable_params(ossl_provider_ctx(EVP_RAND_get0_provider(rand)));
439	0	}
440
441		const OSSL_PARAM EVP_RAND_gettable_ctx_params(const EVP_RAND rand)
442	0	{
443	0	void *provctx;
444
445	0	if (rand->gettable_ctx_params == NULL)
446	0	return NULL;
447	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
448	0	return rand->gettable_ctx_params(NULL, provctx);
449	0	}
450
451		const OSSL_PARAM EVP_RAND_settable_ctx_params(const EVP_RAND rand)
452	214	{
453	214	void *provctx;
454
455	214	if (rand->settable_ctx_params == NULL)
456	1	return NULL;
457	213	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
458	213	return rand->settable_ctx_params(NULL, provctx);
459	214	}
460
461		const OSSL_PARAM EVP_RAND_CTX_gettable_params(EVP_RAND_CTX ctx)
462	0	{
463	0	void *provctx;
464
465	0	if (ctx->meth->gettable_ctx_params == NULL)
466	0	return NULL;
467	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
468	0	return ctx->meth->gettable_ctx_params(ctx->algctx, provctx);
469	0	}
470
471		const OSSL_PARAM EVP_RAND_CTX_settable_params(EVP_RAND_CTX ctx)
472	62	{
473	62	void *provctx;
474
475	62	if (ctx->meth->settable_ctx_params == NULL)
476	49	return NULL;
477	13	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
478	13	return ctx->meth->settable_ctx_params(ctx->algctx, provctx);
479	62	}
480
481		void EVP_RAND_do_all_provided(OSSL_LIB_CTX *libctx,
482		void (fn)(EVP_RAND rand, void *arg),
483		void *arg)
484	2	{
485	2	evp_generic_do_all(libctx, OSSL_OP_RAND,
486	2	(void ()(void , void *))fn, arg,
487	2	evp_rand_from_algorithm, evp_rand_up_ref,
488	2	evp_rand_free);
489	2	}
490
491		int EVP_RAND_names_do_all(const EVP_RAND *rand,
492		void (fn)(const char name, void *data),
493		void *data)
494	0	{
495	0	if (rand->prov != NULL)
496	0	return evp_names_do_all(rand->prov, rand->name_id, fn, data);
497
498	0	return 1;
499	0	}
500
501		static int evp_rand_instantiate_locked
502		(EVP_RAND_CTX *ctx, unsigned int strength, int prediction_resistance,
503		const unsigned char *pstr, size_t pstr_len, const OSSL_PARAM params[])
504	128	{
505	128	return ctx->meth->instantiate(ctx->algctx, strength, prediction_resistance,
506	128	pstr, pstr_len, params);
507	128	}
508
509		int EVP_RAND_instantiate(EVP_RAND_CTX *ctx, unsigned int strength,
510		int prediction_resistance,
511		const unsigned char *pstr, size_t pstr_len,
512		const OSSL_PARAM params[])
513	128	{
514	128	int res;
515
516	128	if (!evp_rand_lock(ctx))
517	0	return 0;
518	128	res = evp_rand_instantiate_locked(ctx, strength, prediction_resistance,
519	128	pstr, pstr_len, params);
520	128	evp_rand_unlock(ctx);
521	128	return res;
522	128	}
523
524		static int evp_rand_uninstantiate_locked(EVP_RAND_CTX *ctx)
525	0	{
526	0	return ctx->meth->uninstantiate(ctx->algctx);
527	0	}
528
529		int EVP_RAND_uninstantiate(EVP_RAND_CTX *ctx)
530	0	{
531	0	int res;
532
533	0	if (!evp_rand_lock(ctx))
534	0	return 0;
535	0	res = evp_rand_uninstantiate_locked(ctx);
536	0	evp_rand_unlock(ctx);
537	0	return res;
538	0	}
539
540		static int evp_rand_generate_locked(EVP_RAND_CTX ctx, unsigned char out,
541		size_t outlen, unsigned int strength,
542		int prediction_resistance,
543		const unsigned char *addin,
544		size_t addin_len)
545	1.19M	{
546	1.19M	size_t chunk, max_request = 0;
547	1.19M	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
548
549	1.19M	params[0] = OSSL_PARAM_construct_size_t(OSSL_RAND_PARAM_MAX_REQUEST,
550	1.19M	&max_request);
551	1.19M	if (!evp_rand_get_ctx_params_locked(ctx, params)
552	1.19M	\|\| max_request == 0) {
553	8	ERR_raise(ERR_LIB_EVP, EVP_R_UNABLE_TO_GET_MAXIMUM_REQUEST_SIZE);
554	8	return 0;
555	8	}
556	2.39M	for (; outlen > 0; outlen -= chunk, out += chunk) {
557	1.20M	chunk = outlen > max_request ? max_request : outlen;
558	1.20M	if (!ctx->meth->generate(ctx->algctx, out, chunk, strength,
559	1.20M	prediction_resistance, addin, addin_len)) {
560	35	ERR_raise(ERR_LIB_EVP, EVP_R_GENERATE_ERROR);
561	35	return 0;
562	35	}
563		/*
564		* Prediction resistance is only relevant the first time around,
565		* subsequently, the DRBG has already been properly reseeded.
566		*/
567	1.20M	prediction_resistance = 0;
568	1.20M	}
569	1.19M	return 1;
570	1.19M	}
571
572		int EVP_RAND_generate(EVP_RAND_CTX ctx, unsigned char out, size_t outlen,
573		unsigned int strength, int prediction_resistance,
574		const unsigned char *addin, size_t addin_len)
575	1.19M	{
576	1.19M	int res;
577
578	1.19M	if (!evp_rand_lock(ctx))
579	0	return 0;
580	1.19M	res = evp_rand_generate_locked(ctx, out, outlen, strength,
581	1.19M	prediction_resistance, addin, addin_len);
582	1.19M	evp_rand_unlock(ctx);
583	1.19M	return res;
584	1.19M	}
585
586		static int evp_rand_reseed_locked(EVP_RAND_CTX *ctx, int prediction_resistance,
587		const unsigned char *ent, size_t ent_len,
588		const unsigned char *addin, size_t addin_len)
589	118	{
590	118	if (ctx->meth->reseed != NULL)
591	118	return ctx->meth->reseed(ctx->algctx, prediction_resistance,
592	118	ent, ent_len, addin, addin_len);
593	0	return 1;
594	118	}
595
596		int EVP_RAND_reseed(EVP_RAND_CTX *ctx, int prediction_resistance,
597		const unsigned char *ent, size_t ent_len,
598		const unsigned char *addin, size_t addin_len)
599	118	{
600	118	int res;
601
602	118	if (!evp_rand_lock(ctx))
603	0	return 0;
604	118	res = evp_rand_reseed_locked(ctx, prediction_resistance,
605	118	ent, ent_len, addin, addin_len);
606	118	evp_rand_unlock(ctx);
607	118	return res;
608	118	}
609
610		static unsigned int evp_rand_strength_locked(EVP_RAND_CTX *ctx)
611	0	{
612	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
613	0	unsigned int strength = 0;
614
615	0	params[0] = OSSL_PARAM_construct_uint(OSSL_RAND_PARAM_STRENGTH, &strength);
616	0	if (!evp_rand_get_ctx_params_locked(ctx, params))
617	0	return 0;
618	0	return strength;
619	0	}
620
621		unsigned int EVP_RAND_get_strength(EVP_RAND_CTX *ctx)
622	0	{
623	0	unsigned int res;
624
625	0	if (!evp_rand_lock(ctx))
626	0	return 0;
627	0	res = evp_rand_strength_locked(ctx);
628	0	evp_rand_unlock(ctx);
629	0	return res;
630	0	}
631
632		static int evp_rand_nonce_locked(EVP_RAND_CTX ctx, unsigned char out,
633		size_t outlen)
634	0	{
635	0	unsigned int str = evp_rand_strength_locked(ctx);
636
637	0	if (ctx->meth->nonce != NULL)
638	0	return ctx->meth->nonce(ctx->algctx, out, str, outlen, outlen) > 0;
639	0	return evp_rand_generate_locked(ctx, out, outlen, str, 0, NULL, 0);
640	0	}
641
642		int EVP_RAND_nonce(EVP_RAND_CTX ctx, unsigned char out, size_t outlen)
643	0	{
644	0	int res;
645
646	0	if (!evp_rand_lock(ctx))
647	0	return 0;
648	0	res = evp_rand_nonce_locked(ctx, out, outlen);
649	0	evp_rand_unlock(ctx);
650	0	return res;
651	0	}
652
653		int EVP_RAND_get_state(EVP_RAND_CTX *ctx)
654	0	{
655	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
656	0	int state;
657
658	0	params[0] = OSSL_PARAM_construct_int(OSSL_RAND_PARAM_STATE, &state);
659	0	if (!EVP_RAND_CTX_get_params(ctx, params))
660	0	state = EVP_RAND_STATE_ERROR;
661	0	return state;
662	0	}
663
664		static int evp_rand_verify_zeroization_locked(EVP_RAND_CTX *ctx)
665	0	{
666	0	if (ctx->meth->verify_zeroization != NULL)
667	0	return ctx->meth->verify_zeroization(ctx->algctx);
668	0	return 0;
669	0	}
670
671		int EVP_RAND_verify_zeroization(EVP_RAND_CTX *ctx)
672	0	{
673	0	int res;
674
675	0	if (!evp_rand_lock(ctx))
676	0	return 0;
677	0	res = evp_rand_verify_zeroization_locked(ctx);
678	0	evp_rand_unlock(ctx);
679	0	return res;
680	0	}