providers/implementations/include/prov/seeding.h

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