2 * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include "crypto/rand.h"
11 #include "crypto/rand_pool.h"
12 #include <openssl/core_dispatch.h>
13 #include <openssl/err.h>
15 size_t ossl_rand_get_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
16 unsigned char **pout, int entropy,
17 size_t min_len, size_t max_len)
20 size_t entropy_available;
23 pool = rand_pool_new(entropy, 1, min_len, max_len);
25 ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
29 /* Get entropy by polling system entropy sources. */
30 entropy_available = ossl_pool_acquire_entropy(pool);
32 if (entropy_available > 0) {
33 ret = rand_pool_length(pool);
34 *pout = rand_pool_detach(pool);
41 void ossl_rand_cleanup_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
42 unsigned char *buf, size_t len)
44 OPENSSL_secure_clear_free(buf, len);
47 size_t ossl_rand_get_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
48 unsigned char **pout, size_t min_len, size_t max_len,
49 const void *salt, size_t salt_len)
54 pool = rand_pool_new(0, 0, min_len, max_len);
56 ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
60 if (!ossl_pool_add_nonce_data(pool))
63 if (salt != NULL && !rand_pool_add(pool, salt, salt_len, 0))
65 ret = rand_pool_length(pool);
66 *pout = rand_pool_detach(pool);
72 void ossl_rand_cleanup_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
73 unsigned char *buf, size_t len)
75 OPENSSL_clear_free(buf, len);