/src/openssl/crypto/evp/evp_rand.c

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/*
 * Copyright 2020-2021 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_EVP_LIB);
        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;
}

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)
        return NULL;
    if ((ctx->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
        OPENSSL_free(ctx);
        ERR_raise(ERR_LIB_EVP, ERR_R_CRYPTO_LIB);
        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_EVP_LIB);
        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 0;
    if (ctx->meth->nonce(ctx->algctx, out, str, outlen, outlen))
        return 1;
    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: 2023-06-08 06:40

Line	Count	Source (jump to first uncovered line)
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 <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	0	{
54	0	EVP_RAND rand = (EVP_RAND )vrand;
55	0	int ref = 0;
56
57	0	if (rand != NULL)
58	0	return CRYPTO_UP_REF(&rand->refcnt, &ref, rand->refcnt_lock);
59	0	return 1;
60	0	}
61
62		static void evp_rand_free(void *vrand)
63	0	{
64	0	EVP_RAND rand = (EVP_RAND )vrand;
65	0	int ref = 0;
66
67	0	if (rand == NULL)
68	0	return;
69	0	CRYPTO_DOWN_REF(&rand->refcnt, &ref, rand->refcnt_lock);
70	0	if (ref > 0)
71	0	return;
72	0	OPENSSL_free(rand->type_name);
73	0	ossl_provider_free(rand->prov);
74	0	CRYPTO_THREAD_lock_free(rand->refcnt_lock);
75	0	OPENSSL_free(rand);
76	0	}
77
78		static void *evp_rand_new(void)
79	0	{
80	0	EVP_RAND rand = OPENSSL_zalloc(sizeof(rand));
81
82	0	if (rand == NULL
83	0	\|\| (rand->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
84	0	OPENSSL_free(rand);
85	0	return NULL;
86	0	}
87	0	rand->refcnt = 1;
88	0	return rand;
89	0	}
90
91		/* Enable locking of the underlying DRBG/RAND if available */
92		int EVP_RAND_enable_locking(EVP_RAND_CTX *rand)
93	0	{
94	0	if (rand->meth->enable_locking != NULL)
95	0	return rand->meth->enable_locking(rand->algctx);
96	0	ERR_raise(ERR_LIB_EVP, EVP_R_LOCKING_NOT_SUPPORTED);
97	0	return 0;
98	0	}
99
100		/* Lock the underlying DRBG/RAND if available */
101		static int evp_rand_lock(EVP_RAND_CTX *rand)
102	0	{
103	0	if (rand->meth->lock != NULL)
104	0	return rand->meth->lock(rand->algctx);
105	0	return 1;
106	0	}
107
108		/* Unlock the underlying DRBG/RAND if available */
109		static void evp_rand_unlock(EVP_RAND_CTX *rand)
110	0	{
111	0	if (rand->meth->unlock != NULL)
112	0	rand->meth->unlock(rand->algctx);
113	0	}
114
115		static void *evp_rand_from_algorithm(int name_id,
116		const OSSL_ALGORITHM *algodef,
117		OSSL_PROVIDER *prov)
118	0	{
119	0	const OSSL_DISPATCH *fns = algodef->implementation;
120	0	EVP_RAND *rand = NULL;
121	0	int fnrandcnt = 0, fnctxcnt = 0, fnlockcnt = 0, fnenablelockcnt = 0;
122		#ifdef FIPS_MODULE
123		int fnzeroizecnt = 0;
124		#endif
125
126	0	if ((rand = evp_rand_new()) == NULL) {
127	0	ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
128	0	return NULL;
129	0	}
130	0	rand->name_id = name_id;
131	0	if ((rand->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
132	0	evp_rand_free(rand);
133	0	return NULL;
134	0	}
135	0	rand->description = algodef->algorithm_description;
136	0	rand->dispatch = fns;
137	0	for (; fns->function_id != 0; fns++) {
138	0	switch (fns->function_id) {
139	0	case OSSL_FUNC_RAND_NEWCTX:
140	0	if (rand->newctx != NULL)
141	0	break;
142	0	rand->newctx = OSSL_FUNC_rand_newctx(fns);
143	0	fnctxcnt++;
144	0	break;
145	0	case OSSL_FUNC_RAND_FREECTX:
146	0	if (rand->freectx != NULL)
147	0	break;
148	0	rand->freectx = OSSL_FUNC_rand_freectx(fns);
149	0	fnctxcnt++;
150	0	break;
151	0	case OSSL_FUNC_RAND_INSTANTIATE:
152	0	if (rand->instantiate != NULL)
153	0	break;
154	0	rand->instantiate = OSSL_FUNC_rand_instantiate(fns);
155	0	fnrandcnt++;
156	0	break;
157	0	case OSSL_FUNC_RAND_UNINSTANTIATE:
158	0	if (rand->uninstantiate != NULL)
159	0	break;
160	0	rand->uninstantiate = OSSL_FUNC_rand_uninstantiate(fns);
161	0	fnrandcnt++;
162	0	break;
163	0	case OSSL_FUNC_RAND_GENERATE:
164	0	if (rand->generate != NULL)
165	0	break;
166	0	rand->generate = OSSL_FUNC_rand_generate(fns);
167	0	fnrandcnt++;
168	0	break;
169	0	case OSSL_FUNC_RAND_RESEED:
170	0	if (rand->reseed != NULL)
171	0	break;
172	0	rand->reseed = OSSL_FUNC_rand_reseed(fns);
173	0	break;
174	0	case OSSL_FUNC_RAND_NONCE:
175	0	if (rand->nonce != NULL)
176	0	break;
177	0	rand->nonce = OSSL_FUNC_rand_nonce(fns);
178	0	break;
179	0	case OSSL_FUNC_RAND_ENABLE_LOCKING:
180	0	if (rand->enable_locking != NULL)
181	0	break;
182	0	rand->enable_locking = OSSL_FUNC_rand_enable_locking(fns);
183	0	fnenablelockcnt++;
184	0	break;
185	0	case OSSL_FUNC_RAND_LOCK:
186	0	if (rand->lock != NULL)
187	0	break;
188	0	rand->lock = OSSL_FUNC_rand_lock(fns);
189	0	fnlockcnt++;
190	0	break;
191	0	case OSSL_FUNC_RAND_UNLOCK:
192	0	if (rand->unlock != NULL)
193	0	break;
194	0	rand->unlock = OSSL_FUNC_rand_unlock(fns);
195	0	fnlockcnt++;
196	0	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	0	case OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS:
204	0	if (rand->gettable_ctx_params != NULL)
205	0	break;
206	0	rand->gettable_ctx_params =
207	0	OSSL_FUNC_rand_gettable_ctx_params(fns);
208	0	break;
209	0	case OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS:
210	0	if (rand->settable_ctx_params != NULL)
211	0	break;
212	0	rand->settable_ctx_params =
213	0	OSSL_FUNC_rand_settable_ctx_params(fns);
214	0	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	0	case OSSL_FUNC_RAND_GET_CTX_PARAMS:
221	0	if (rand->get_ctx_params != NULL)
222	0	break;
223	0	rand->get_ctx_params = OSSL_FUNC_rand_get_ctx_params(fns);
224	0	fnctxcnt++;
225	0	break;
226	0	case OSSL_FUNC_RAND_SET_CTX_PARAMS:
227	0	if (rand->set_ctx_params != NULL)
228	0	break;
229	0	rand->set_ctx_params = OSSL_FUNC_rand_set_ctx_params(fns);
230	0	break;
231	0	case OSSL_FUNC_RAND_VERIFY_ZEROIZATION:
232	0	if (rand->verify_zeroization != NULL)
233	0	break;
234	0	rand->verify_zeroization = OSSL_FUNC_rand_verify_zeroization(fns);
235		#ifdef FIPS_MODULE
236		fnzeroizecnt++;
237		#endif
238	0	break;
239	0	}
240	0	}
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	0	if (fnrandcnt != 3
251	0	\|\| fnctxcnt != 3
252	0	\|\| (fnenablelockcnt != 0 && fnenablelockcnt != 1)
253	0	\|\| (fnlockcnt != 0 && fnlockcnt != 2)
254		#ifdef FIPS_MODULE
255		\|\| fnzeroizecnt != 1
256		#endif
257	0	) {
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	0	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	0	rand->prov = prov;
269
270	0	return rand;
271	0	}
272
273		EVP_RAND EVP_RAND_fetch(OSSL_LIB_CTX libctx, const char *algorithm,
274		const char *properties)
275	0	{
276	0	return evp_generic_fetch(libctx, OSSL_OP_RAND, algorithm, properties,
277	0	evp_rand_from_algorithm, evp_rand_up_ref,
278	0	evp_rand_free);
279	0	}
280
281		int EVP_RAND_up_ref(EVP_RAND *rand)
282	0	{
283	0	return evp_rand_up_ref(rand);
284	0	}
285
286		void EVP_RAND_free(EVP_RAND *rand)
287	0	{
288	0	evp_rand_free(rand);
289	0	}
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	0	{
313	0	return rand->prov;
314	0	}
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		int EVP_RAND_CTX_up_ref(EVP_RAND_CTX *ctx)
324	0	{
325	0	int ref = 0;
326
327	0	return CRYPTO_UP_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
328	0	}
329
330		EVP_RAND_CTX EVP_RAND_CTX_new(EVP_RAND rand, EVP_RAND_CTX *parent)
331	0	{
332	0	EVP_RAND_CTX *ctx;
333	0	void *parent_ctx = NULL;
334	0	const OSSL_DISPATCH *parent_dispatch = NULL;
335
336	0	if (rand == NULL) {
337	0	ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
338	0	return NULL;
339	0	}
340
341	0	ctx = OPENSSL_zalloc(sizeof(*ctx));
342	0	if (ctx == NULL)
343	0	return NULL;
344	0	if ((ctx->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL) {
345	0	OPENSSL_free(ctx);
346	0	ERR_raise(ERR_LIB_EVP, ERR_R_CRYPTO_LIB);
347	0	return NULL;
348	0	}
349	0	if (parent != NULL) {
350	0	if (!EVP_RAND_CTX_up_ref(parent)) {
351	0	ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
352	0	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
353	0	OPENSSL_free(ctx);
354	0	return NULL;
355	0	}
356	0	parent_ctx = parent->algctx;
357	0	parent_dispatch = parent->meth->dispatch;
358	0	}
359	0	if ((ctx->algctx = rand->newctx(ossl_provider_ctx(rand->prov), parent_ctx,
360	0	parent_dispatch)) == NULL
361	0	\|\| !EVP_RAND_up_ref(rand)) {
362	0	ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
363	0	rand->freectx(ctx->algctx);
364	0	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
365	0	OPENSSL_free(ctx);
366	0	EVP_RAND_CTX_free(parent);
367	0	return NULL;
368	0	}
369	0	ctx->meth = rand;
370	0	ctx->parent = parent;
371	0	ctx->refcnt = 1;
372	0	return ctx;
373	0	}
374
375		void EVP_RAND_CTX_free(EVP_RAND_CTX *ctx)
376	4	{
377	4	int ref = 0;
378	4	EVP_RAND_CTX *parent;
379
380	4	if (ctx == NULL)
381	4	return;
382
383	0	CRYPTO_DOWN_REF(&ctx->refcnt, &ref, ctx->refcnt_lock);
384	0	if (ref > 0)
385	0	return;
386	0	parent = ctx->parent;
387	0	ctx->meth->freectx(ctx->algctx);
388	0	ctx->algctx = NULL;
389	0	EVP_RAND_free(ctx->meth);
390	0	CRYPTO_THREAD_lock_free(ctx->refcnt_lock);
391	0	OPENSSL_free(ctx);
392	0	EVP_RAND_CTX_free(parent);
393	0	}
394
395		EVP_RAND EVP_RAND_CTX_get0_rand(EVP_RAND_CTX ctx)
396	0	{
397	0	return ctx->meth;
398	0	}
399
400		static int evp_rand_get_ctx_params_locked(EVP_RAND_CTX *ctx,
401		OSSL_PARAM params[])
402	0	{
403	0	return ctx->meth->get_ctx_params(ctx->algctx, params);
404	0	}
405
406		int EVP_RAND_CTX_get_params(EVP_RAND_CTX *ctx, OSSL_PARAM params[])
407	0	{
408	0	int res;
409
410	0	if (!evp_rand_lock(ctx))
411	0	return 0;
412	0	res = evp_rand_get_ctx_params_locked(ctx, params);
413	0	evp_rand_unlock(ctx);
414	0	return res;
415	0	}
416
417		static int evp_rand_set_ctx_params_locked(EVP_RAND_CTX *ctx,
418		const OSSL_PARAM params[])
419	0	{
420	0	if (ctx->meth->set_ctx_params != NULL)
421	0	return ctx->meth->set_ctx_params(ctx->algctx, params);
422	0	return 1;
423	0	}
424
425		int EVP_RAND_CTX_set_params(EVP_RAND_CTX *ctx, const OSSL_PARAM params[])
426	0	{
427	0	int res;
428
429	0	if (!evp_rand_lock(ctx))
430	0	return 0;
431	0	res = evp_rand_set_ctx_params_locked(ctx, params);
432	0	evp_rand_unlock(ctx);
433	0	return res;
434	0	}
435
436		const OSSL_PARAM EVP_RAND_gettable_params(const EVP_RAND rand)
437	0	{
438	0	if (rand->gettable_params == NULL)
439	0	return NULL;
440	0	return rand->gettable_params(ossl_provider_ctx(EVP_RAND_get0_provider(rand)));
441	0	}
442
443		const OSSL_PARAM EVP_RAND_gettable_ctx_params(const EVP_RAND rand)
444	0	{
445	0	void *provctx;
446
447	0	if (rand->gettable_ctx_params == NULL)
448	0	return NULL;
449	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
450	0	return rand->gettable_ctx_params(NULL, provctx);
451	0	}
452
453		const OSSL_PARAM EVP_RAND_settable_ctx_params(const EVP_RAND rand)
454	0	{
455	0	void *provctx;
456
457	0	if (rand->settable_ctx_params == NULL)
458	0	return NULL;
459	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(rand));
460	0	return rand->settable_ctx_params(NULL, provctx);
461	0	}
462
463		const OSSL_PARAM EVP_RAND_CTX_gettable_params(EVP_RAND_CTX ctx)
464	0	{
465	0	void *provctx;
466
467	0	if (ctx->meth->gettable_ctx_params == NULL)
468	0	return NULL;
469	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
470	0	return ctx->meth->gettable_ctx_params(ctx->algctx, provctx);
471	0	}
472
473		const OSSL_PARAM EVP_RAND_CTX_settable_params(EVP_RAND_CTX ctx)
474	0	{
475	0	void *provctx;
476
477	0	if (ctx->meth->settable_ctx_params == NULL)
478	0	return NULL;
479	0	provctx = ossl_provider_ctx(EVP_RAND_get0_provider(ctx->meth));
480	0	return ctx->meth->settable_ctx_params(ctx->algctx, provctx);
481	0	}
482
483		void EVP_RAND_do_all_provided(OSSL_LIB_CTX *libctx,
484		void (fn)(EVP_RAND rand, void *arg),
485		void *arg)
486	0	{
487	0	evp_generic_do_all(libctx, OSSL_OP_RAND,
488	0	(void ()(void , void *))fn, arg,
489	0	evp_rand_from_algorithm, evp_rand_up_ref,
490	0	evp_rand_free);
491	0	}
492
493		int EVP_RAND_names_do_all(const EVP_RAND *rand,
494		void (fn)(const char name, void *data),
495		void *data)
496	0	{
497	0	if (rand->prov != NULL)
498	0	return evp_names_do_all(rand->prov, rand->name_id, fn, data);
499
500	0	return 1;
501	0	}
502
503		static int evp_rand_instantiate_locked
504		(EVP_RAND_CTX *ctx, unsigned int strength, int prediction_resistance,
505		const unsigned char *pstr, size_t pstr_len, const OSSL_PARAM params[])
506	0	{
507	0	return ctx->meth->instantiate(ctx->algctx, strength, prediction_resistance,
508	0	pstr, pstr_len, params);
509	0	}
510
511		int EVP_RAND_instantiate(EVP_RAND_CTX *ctx, unsigned int strength,
512		int prediction_resistance,
513		const unsigned char *pstr, size_t pstr_len,
514		const OSSL_PARAM params[])
515	0	{
516	0	int res;
517
518	0	if (!evp_rand_lock(ctx))
519	0	return 0;
520	0	res = evp_rand_instantiate_locked(ctx, strength, prediction_resistance,
521	0	pstr, pstr_len, params);
522	0	evp_rand_unlock(ctx);
523	0	return res;
524	0	}
525
526		static int evp_rand_uninstantiate_locked(EVP_RAND_CTX *ctx)
527	0	{
528	0	return ctx->meth->uninstantiate(ctx->algctx);
529	0	}
530
531		int EVP_RAND_uninstantiate(EVP_RAND_CTX *ctx)
532	0	{
533	0	int res;
534
535	0	if (!evp_rand_lock(ctx))
536	0	return 0;
537	0	res = evp_rand_uninstantiate_locked(ctx);
538	0	evp_rand_unlock(ctx);
539	0	return res;
540	0	}
541
542		static int evp_rand_generate_locked(EVP_RAND_CTX ctx, unsigned char out,
543		size_t outlen, unsigned int strength,
544		int prediction_resistance,
545		const unsigned char *addin,
546		size_t addin_len)
547	0	{
548	0	size_t chunk, max_request = 0;
549	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
550
551	0	params[0] = OSSL_PARAM_construct_size_t(OSSL_RAND_PARAM_MAX_REQUEST,
552	0	&max_request);
553	0	if (!evp_rand_get_ctx_params_locked(ctx, params)
554	0	\|\| max_request == 0) {
555	0	ERR_raise(ERR_LIB_EVP, EVP_R_UNABLE_TO_GET_MAXIMUM_REQUEST_SIZE);
556	0	return 0;
557	0	}
558	0	for (; outlen > 0; outlen -= chunk, out += chunk) {
559	0	chunk = outlen > max_request ? max_request : outlen;
560	0	if (!ctx->meth->generate(ctx->algctx, out, chunk, strength,
561	0	prediction_resistance, addin, addin_len)) {
562	0	ERR_raise(ERR_LIB_EVP, EVP_R_GENERATE_ERROR);
563	0	return 0;
564	0	}
565		/*
566		* Prediction resistance is only relevant the first time around,
567		* subsequently, the DRBG has already been properly reseeded.
568		*/
569	0	prediction_resistance = 0;
570	0	}
571	0	return 1;
572	0	}
573
574		int EVP_RAND_generate(EVP_RAND_CTX ctx, unsigned char out, size_t outlen,
575		unsigned int strength, int prediction_resistance,
576		const unsigned char *addin, size_t addin_len)
577	0	{
578	0	int res;
579
580	0	if (!evp_rand_lock(ctx))
581	0	return 0;
582	0	res = evp_rand_generate_locked(ctx, out, outlen, strength,
583	0	prediction_resistance, addin, addin_len);
584	0	evp_rand_unlock(ctx);
585	0	return res;
586	0	}
587
588		static int evp_rand_reseed_locked(EVP_RAND_CTX *ctx, int prediction_resistance,
589		const unsigned char *ent, size_t ent_len,
590		const unsigned char *addin, size_t addin_len)
591	0	{
592	0	if (ctx->meth->reseed != NULL)
593	0	return ctx->meth->reseed(ctx->algctx, prediction_resistance,
594	0	ent, ent_len, addin, addin_len);
595	0	return 1;
596	0	}
597
598		int EVP_RAND_reseed(EVP_RAND_CTX *ctx, int prediction_resistance,
599		const unsigned char *ent, size_t ent_len,
600		const unsigned char *addin, size_t addin_len)
601	0	{
602	0	int res;
603
604	0	if (!evp_rand_lock(ctx))
605	0	return 0;
606	0	res = evp_rand_reseed_locked(ctx, prediction_resistance,
607	0	ent, ent_len, addin, addin_len);
608	0	evp_rand_unlock(ctx);
609	0	return res;
610	0	}
611
612		static unsigned int evp_rand_strength_locked(EVP_RAND_CTX *ctx)
613	0	{
614	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
615	0	unsigned int strength = 0;
616
617	0	params[0] = OSSL_PARAM_construct_uint(OSSL_RAND_PARAM_STRENGTH, &strength);
618	0	if (!evp_rand_get_ctx_params_locked(ctx, params))
619	0	return 0;
620	0	return strength;
621	0	}
622
623		unsigned int EVP_RAND_get_strength(EVP_RAND_CTX *ctx)
624	0	{
625	0	unsigned int res;
626
627	0	if (!evp_rand_lock(ctx))
628	0	return 0;
629	0	res = evp_rand_strength_locked(ctx);
630	0	evp_rand_unlock(ctx);
631	0	return res;
632	0	}
633
634		static int evp_rand_nonce_locked(EVP_RAND_CTX ctx, unsigned char out,
635		size_t outlen)
636	0	{
637	0	unsigned int str = evp_rand_strength_locked(ctx);
638
639	0	if (ctx->meth->nonce == NULL)
640	0	return 0;
641	0	if (ctx->meth->nonce(ctx->algctx, out, str, outlen, outlen))
642	0	return 1;
643	0	return evp_rand_generate_locked(ctx, out, outlen, str, 0, NULL, 0);
644	0	}
645
646		int EVP_RAND_nonce(EVP_RAND_CTX ctx, unsigned char out, size_t outlen)
647	0	{
648	0	int res;
649
650	0	if (!evp_rand_lock(ctx))
651	0	return 0;
652	0	res = evp_rand_nonce_locked(ctx, out, outlen);
653	0	evp_rand_unlock(ctx);
654	0	return res;
655	0	}
656
657		int EVP_RAND_get_state(EVP_RAND_CTX *ctx)
658	0	{
659	0	OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
660	0	int state;
661
662	0	params[0] = OSSL_PARAM_construct_int(OSSL_RAND_PARAM_STATE, &state);
663	0	if (!EVP_RAND_CTX_get_params(ctx, params))
664	0	state = EVP_RAND_STATE_ERROR;
665	0	return state;
666	0	}
667
668		static int evp_rand_verify_zeroization_locked(EVP_RAND_CTX *ctx)
669	0	{
670	0	if (ctx->meth->verify_zeroization != NULL)
671	0	return ctx->meth->verify_zeroization(ctx->algctx);
672	0	return 0;
673	0	}
674
675		int EVP_RAND_verify_zeroization(EVP_RAND_CTX *ctx)
676	0	{
677	0	int res;
678
679	0	if (!evp_rand_lock(ctx))
680	0	return 0;
681	0	res = evp_rand_verify_zeroization_locked(ctx);
682	0	evp_rand_unlock(ctx);
683	0	return res;
684	0	}