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 "prov/provider_ctx.h"
11#include "crypto/rand_pool.h"
12
13/* Hardware-based seeding functions. */
14size_t ossl_prov_acquire_entropy_from_tsc(RAND_POOL *pool);
15size_t ossl_prov_acquire_entropy_from_cpu(RAND_POOL *pool);
16
17/*
18 * Add some platform specific additional data
19 *
20 * This function is platform specific and adds some random noise to the
21 * additional data used for generating random bytes and for reseeding
22 * the drbg.
23 *
24 * Returns 1 on success and 0 on failure.
25 */
26int ossl_rand_pool_add_additional_data(RAND_POOL *pool);
27
28/*
29 * External seeding functions from the core dispatch table.
30 */
31int ossl_prov_seeding_from_dispatch(const OSSL_DISPATCH *fns);
32
33size_t ossl_prov_get_entropy(PROV_CTX *prov_ctx, unsigned char **pout,
34                             int entropy, size_t min_len, size_t max_len);
35void ossl_prov_cleanup_entropy(PROV_CTX *prov_ctx, unsigned char *buf,
36                               size_t len);
37size_t ossl_prov_get_nonce(PROV_CTX *prov_ctx, unsigned char **pout,
38                           size_t min_len, size_t max_len,
39                           const void *salt, size_t salt_len);
40void ossl_prov_cleanup_nonce(PROV_CTX *prov_ctx, unsigned char *buf,
41                             size_t len);
42