1 /*
2 * Copyright 2020-2022 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 "crypto/rand.h"
11 #include "crypto/rand_pool.h"
12 #include <openssl/core_dispatch.h>
13 #include <openssl/err.h>
14
ossl_rand_get_entropy(ossl_unused const OSSL_CORE_HANDLE * handle,unsigned char ** pout,int entropy,size_t min_len,size_t max_len)15 size_t ossl_rand_get_entropy(ossl_unused const OSSL_CORE_HANDLE *handle,
16 unsigned char **pout, int entropy,
17 size_t min_len, size_t max_len)
18 {
19 size_t ret = 0;
20 size_t entropy_available;
21 RAND_POOL *pool;
22
23 pool = ossl_rand_pool_new(entropy, 1, min_len, max_len);
24 if (pool == NULL) {
25 ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
26 return 0;
27 }
28
29 /* Get entropy by polling system entropy sources. */
30 entropy_available = ossl_pool_acquire_entropy(pool);
31
32 if (entropy_available > 0) {
33 ret = ossl_rand_pool_length(pool);
34 *pout = ossl_rand_pool_detach(pool);
35 }
36
37 ossl_rand_pool_free(pool);
38 return ret;
39 }
40
ossl_rand_cleanup_entropy(ossl_unused const OSSL_CORE_HANDLE * handle,unsigned char * buf,size_t len)41 void ossl_rand_cleanup_entropy(ossl_unused const OSSL_CORE_HANDLE *handle,
42 unsigned char *buf, size_t len)
43 {
44 OPENSSL_secure_clear_free(buf, len);
45 }
46
ossl_rand_get_nonce(ossl_unused const OSSL_CORE_HANDLE * handle,unsigned char ** pout,size_t min_len,size_t max_len,const void * salt,size_t salt_len)47 size_t ossl_rand_get_nonce(ossl_unused const OSSL_CORE_HANDLE *handle,
48 unsigned char **pout, size_t min_len, size_t max_len,
49 const void *salt, size_t salt_len)
50 {
51 size_t ret = 0;
52 RAND_POOL *pool;
53
54 pool = ossl_rand_pool_new(0, 0, min_len, max_len);
55 if (pool == NULL) {
56 ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
57 return 0;
58 }
59
60 if (!ossl_pool_add_nonce_data(pool))
61 goto err;
62
63 if (salt != NULL && !ossl_rand_pool_add(pool, salt, salt_len, 0))
64 goto err;
65 ret = ossl_rand_pool_length(pool);
66 *pout = ossl_rand_pool_detach(pool);
67 err:
68 ossl_rand_pool_free(pool);
69 return ret;
70 }
71
ossl_rand_cleanup_nonce(ossl_unused const OSSL_CORE_HANDLE * handle,unsigned char * buf,size_t len)72 void ossl_rand_cleanup_nonce(ossl_unused const OSSL_CORE_HANDLE *handle,
73 unsigned char *buf, size_t len)
74 {
75 OPENSSL_clear_free(buf, len);
76 }
77