1 /* crypto/rand/rand_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
62 #include <openssl/rand.h>
65 # include <openssl/fips.h>
66 # include <openssl/fips_rand.h>
69 #ifndef OPENSSL_NO_ENGINE
70 # include <openssl/engine.h>
73 static const RAND_METHOD *default_RAND_meth = NULL;
77 static int fips_RAND_set_rand_method(const RAND_METHOD *meth,
78 const RAND_METHOD **pmeth)
84 static const RAND_METHOD *fips_RAND_get_rand_method(const RAND_METHOD **pmeth)
88 *pmeth = FIPS_rand_method();
90 *pmeth = RAND_SSLeay();
94 && *pmeth != FIPS_rand_check()) {
95 RANDerr(RAND_F_FIPS_RAND_GET_RAND_METHOD, RAND_R_NON_FIPS_METHOD);
102 static int (*RAND_set_rand_method_func) (const RAND_METHOD *meth,
103 const RAND_METHOD **pmeth)
104 = fips_RAND_set_rand_method;
105 static const RAND_METHOD *(*RAND_get_rand_method_func)
106 (const RAND_METHOD **pmeth)
107 = fips_RAND_get_rand_method;
109 # ifndef OPENSSL_NO_ENGINE
110 void int_RAND_set_callbacks(int (*set_rand_func) (const RAND_METHOD *meth,
111 const RAND_METHOD **pmeth),
112 const RAND_METHOD *(*get_rand_func)
113 (const RAND_METHOD **pmeth))
115 RAND_set_rand_method_func = set_rand_func;
116 RAND_get_rand_method_func = get_rand_func;
120 int RAND_set_rand_method(const RAND_METHOD *meth)
122 return RAND_set_rand_method_func(meth, &default_RAND_meth);
125 const RAND_METHOD *RAND_get_rand_method(void)
127 return RAND_get_rand_method_func(&default_RAND_meth);
132 # ifndef OPENSSL_NO_ENGINE
133 /* non-NULL if default_RAND_meth is ENGINE-provided */
134 static ENGINE *funct_ref = NULL;
137 int RAND_set_rand_method(const RAND_METHOD *meth)
139 # ifndef OPENSSL_NO_ENGINE
141 ENGINE_finish(funct_ref);
145 default_RAND_meth = meth;
149 const RAND_METHOD *RAND_get_rand_method(void)
151 if (!default_RAND_meth) {
152 # ifndef OPENSSL_NO_ENGINE
153 ENGINE *e = ENGINE_get_default_RAND();
155 default_RAND_meth = ENGINE_get_RAND(e);
156 if (!default_RAND_meth) {
165 default_RAND_meth = RAND_SSLeay();
167 return default_RAND_meth;
170 # ifndef OPENSSL_NO_ENGINE
171 int RAND_set_rand_engine(ENGINE *engine)
173 const RAND_METHOD *tmp_meth = NULL;
175 if (!ENGINE_init(engine))
177 tmp_meth = ENGINE_get_RAND(engine);
179 ENGINE_finish(engine);
183 /* This function releases any prior ENGINE so call it first */
184 RAND_set_rand_method(tmp_meth);
192 void RAND_cleanup(void)
194 const RAND_METHOD *meth = RAND_get_rand_method();
195 if (meth && meth->cleanup)
197 RAND_set_rand_method(NULL);
200 void RAND_seed(const void *buf, int num)
202 const RAND_METHOD *meth = RAND_get_rand_method();
203 if (meth && meth->seed)
204 meth->seed(buf, num);
207 void RAND_add(const void *buf, int num, double entropy)
209 const RAND_METHOD *meth = RAND_get_rand_method();
210 if (meth && meth->add)
211 meth->add(buf, num, entropy);
214 int RAND_bytes(unsigned char *buf, int num)
216 const RAND_METHOD *meth = RAND_get_rand_method();
217 if (meth && meth->bytes)
218 return meth->bytes(buf, num);
222 int RAND_pseudo_bytes(unsigned char *buf, int num)
224 const RAND_METHOD *meth = RAND_get_rand_method();
225 if (meth && meth->pseudorand)
226 return meth->pseudorand(buf, num);
230 int RAND_status(void)
232 const RAND_METHOD *meth = RAND_get_rand_method();
233 if (meth && meth->status)
234 return meth->status();