1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
60 #include "internal/cryptlib.h"
61 #include <openssl/opensslconf.h>
62 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 # include <openssl/engine.h>
69 # include <openssl/fips.h>
70 # include <openssl/fips_rand.h>
73 #ifndef OPENSSL_NO_ENGINE
74 /* non-NULL if default_RAND_meth is ENGINE-provided */
75 static ENGINE *funct_ref = NULL;
77 static const RAND_METHOD *default_RAND_meth = NULL;
79 int RAND_set_rand_method(const RAND_METHOD *meth)
81 #ifndef OPENSSL_NO_ENGINE
83 ENGINE_finish(funct_ref);
87 default_RAND_meth = meth;
91 const RAND_METHOD *RAND_get_rand_method(void)
93 if (!default_RAND_meth) {
94 #ifndef OPENSSL_NO_ENGINE
95 ENGINE *e = ENGINE_get_default_RAND();
97 default_RAND_meth = ENGINE_get_RAND(e);
98 if (!default_RAND_meth) {
107 default_RAND_meth = RAND_OpenSSL();
109 return default_RAND_meth;
112 #ifndef OPENSSL_NO_ENGINE
113 int RAND_set_rand_engine(ENGINE *engine)
115 const RAND_METHOD *tmp_meth = NULL;
117 if (!ENGINE_init(engine))
119 tmp_meth = ENGINE_get_RAND(engine);
121 ENGINE_finish(engine);
125 /* This function releases any prior ENGINE so call it first */
126 RAND_set_rand_method(tmp_meth);
132 void RAND_cleanup(void)
134 const RAND_METHOD *meth = RAND_get_rand_method();
135 if (meth && meth->cleanup)
137 RAND_set_rand_method(NULL);
140 void RAND_seed(const void *buf, int num)
142 const RAND_METHOD *meth = RAND_get_rand_method();
143 if (meth && meth->seed)
144 meth->seed(buf, num);
147 void RAND_add(const void *buf, int num, double entropy)
149 const RAND_METHOD *meth = RAND_get_rand_method();
150 if (meth && meth->add)
151 meth->add(buf, num, entropy);
154 int RAND_bytes(unsigned char *buf, int num)
156 const RAND_METHOD *meth = RAND_get_rand_method();
157 if (meth && meth->bytes)
158 return meth->bytes(buf, num);
162 #if OPENSSL_API_COMPAT < 0x10100000L
163 int RAND_pseudo_bytes(unsigned char *buf, int num)
165 const RAND_METHOD *meth = RAND_get_rand_method();
166 if (meth && meth->pseudorand)
167 return meth->pseudorand(buf, num);
172 int RAND_status(void)
174 const RAND_METHOD *meth = RAND_get_rand_method();
175 if (meth && meth->status)
176 return meth->status();