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      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. */
     14 size_t ossl_prov_acquire_entropy_from_tsc(RAND_POOL *pool);
     15 size_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  */
     26 int ossl_rand_pool_add_additional_data(RAND_POOL *pool);
     27 
     28 /*
     29  * External seeding functions from the core dispatch table.
     30  */
     31 int ossl_prov_seeding_from_dispatch(const OSSL_DISPATCH *fns);
     32 
     33 size_t ossl_prov_get_entropy(PROV_CTX *prov_ctx, unsigned char **pout,
     34                              int entropy, size_t min_len, size_t max_len);
     35 void ossl_prov_cleanup_entropy(PROV_CTX *prov_ctx, unsigned char *buf,
     36                                size_t len);
     37 size_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);
     40 void ossl_prov_cleanup_nonce(PROV_CTX *prov_ctx, unsigned char *buf,
     41                              size_t len);
     42