2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
12 #include "internal/cryptlib.h"
13 #include <openssl/opensslconf.h>
14 #include "internal/rand.h"
15 #include <openssl/engine.h>
16 #include "internal/thread_once.h"
18 #ifndef OPENSSL_NO_ENGINE
19 /* non-NULL if default_RAND_meth is ENGINE-provided */
20 static ENGINE *funct_ref = NULL;
21 static CRYPTO_RWLOCK *rand_engine_lock = NULL;
23 static const RAND_METHOD *default_RAND_meth = NULL;
24 static CRYPTO_RWLOCK *rand_meth_lock = NULL;
25 static CRYPTO_ONCE rand_lock_init = CRYPTO_ONCE_STATIC_INIT;
27 DEFINE_RUN_ONCE_STATIC(do_rand_lock_init)
29 #ifndef OPENSSL_NO_ENGINE
30 rand_engine_lock = CRYPTO_THREAD_lock_new();
32 rand_meth_lock = CRYPTO_THREAD_lock_new();
33 return rand_engine_lock != NULL && rand_meth_lock != NULL;
36 int RAND_set_rand_method(const RAND_METHOD *meth)
38 if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
41 CRYPTO_THREAD_write_lock(rand_meth_lock);
42 #ifndef OPENSSL_NO_ENGINE
43 ENGINE_finish(funct_ref);
46 default_RAND_meth = meth;
47 CRYPTO_THREAD_unlock(rand_meth_lock);
51 const RAND_METHOD *RAND_get_rand_method(void)
53 const RAND_METHOD *tmp_meth = NULL;
55 if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
58 CRYPTO_THREAD_write_lock(rand_meth_lock);
59 if (!default_RAND_meth) {
60 #ifndef OPENSSL_NO_ENGINE
61 ENGINE *e = ENGINE_get_default_RAND();
63 default_RAND_meth = ENGINE_get_RAND(e);
64 if (default_RAND_meth == NULL) {
73 default_RAND_meth = RAND_OpenSSL();
75 tmp_meth = default_RAND_meth;
76 CRYPTO_THREAD_unlock(rand_meth_lock);
80 #ifndef OPENSSL_NO_ENGINE
81 int RAND_set_rand_engine(ENGINE *engine)
83 const RAND_METHOD *tmp_meth = NULL;
85 if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
89 if (!ENGINE_init(engine))
91 tmp_meth = ENGINE_get_RAND(engine);
92 if (tmp_meth == NULL) {
93 ENGINE_finish(engine);
97 CRYPTO_THREAD_write_lock(rand_engine_lock);
98 /* This function releases any prior ENGINE so call it first */
99 RAND_set_rand_method(tmp_meth);
101 CRYPTO_THREAD_unlock(rand_engine_lock);
106 void rand_cleanup_int(void)
108 const RAND_METHOD *meth = default_RAND_meth;
109 if (meth && meth->cleanup)
111 RAND_set_rand_method(NULL);
112 CRYPTO_THREAD_lock_free(rand_meth_lock);
113 CRYPTO_THREAD_lock_free(rand_engine_lock);
116 void RAND_seed(const void *buf, int num)
118 const RAND_METHOD *meth = RAND_get_rand_method();
119 if (meth && meth->seed)
120 meth->seed(buf, num);
123 void RAND_add(const void *buf, int num, double entropy)
125 const RAND_METHOD *meth = RAND_get_rand_method();
126 if (meth && meth->add)
127 meth->add(buf, num, entropy);
130 int RAND_bytes(unsigned char *buf, int num)
132 const RAND_METHOD *meth = RAND_get_rand_method();
133 if (meth && meth->bytes)
134 return meth->bytes(buf, num);
138 #if OPENSSL_API_COMPAT < 0x10100000L
139 int RAND_pseudo_bytes(unsigned char *buf, int num)
141 const RAND_METHOD *meth = RAND_get_rand_method();
142 if (meth && meth->pseudorand)
143 return meth->pseudorand(buf, num);
148 int RAND_status(void)
150 const RAND_METHOD *meth = RAND_get_rand_method();
151 if (meth && meth->status)
152 return meth->status();