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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rand/rand_lib.c
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 "internal/rand.h"
64 #include <openssl/engine.h>
67 # include <openssl/fips.h>
68 # include <openssl/fips_rand.h>
71 #ifndef OPENSSL_NO_ENGINE
72 /* non-NULL if default_RAND_meth is ENGINE-provided */
73 static ENGINE
*funct_ref
= NULL
;
75 static const RAND_METHOD
*default_RAND_meth
= NULL
;
77 int RAND_set_rand_method(const RAND_METHOD
*meth
)
79 #ifndef OPENSSL_NO_ENGINE
80 ENGINE_finish(funct_ref
);
83 default_RAND_meth
= meth
;
87 const RAND_METHOD
*RAND_get_rand_method(void)
89 if (!default_RAND_meth
) {
90 #ifndef OPENSSL_NO_ENGINE
91 ENGINE
*e
= ENGINE_get_default_RAND();
93 default_RAND_meth
= ENGINE_get_RAND(e
);
94 if (default_RAND_meth
== NULL
) {
103 default_RAND_meth
= RAND_OpenSSL();
105 return default_RAND_meth
;
108 #ifndef OPENSSL_NO_ENGINE
109 int RAND_set_rand_engine(ENGINE
*engine
)
111 const RAND_METHOD
*tmp_meth
= NULL
;
113 if (!ENGINE_init(engine
))
115 tmp_meth
= ENGINE_get_RAND(engine
);
116 if (tmp_meth
== NULL
) {
117 ENGINE_finish(engine
);
121 /* This function releases any prior ENGINE so call it first */
122 RAND_set_rand_method(tmp_meth
);
128 void int_rand_cleanup(void)
130 const RAND_METHOD
*meth
= RAND_get_rand_method();
131 if (meth
&& meth
->cleanup
)
133 RAND_set_rand_method(NULL
);
136 void RAND_seed(const void *buf
, int num
)
138 const RAND_METHOD
*meth
= RAND_get_rand_method();
139 if (meth
&& meth
->seed
)
140 meth
->seed(buf
, num
);
143 void RAND_add(const void *buf
, int num
, double entropy
)
145 const RAND_METHOD
*meth
= RAND_get_rand_method();
146 if (meth
&& meth
->add
)
147 meth
->add(buf
, num
, entropy
);
150 int RAND_bytes(unsigned char *buf
, int num
)
152 const RAND_METHOD
*meth
= RAND_get_rand_method();
153 if (meth
&& meth
->bytes
)
154 return meth
->bytes(buf
, num
);
158 #if OPENSSL_API_COMPAT < 0x10100000L
159 int RAND_pseudo_bytes(unsigned char *buf
, int num
)
161 const RAND_METHOD
*meth
= RAND_get_rand_method();
162 if (meth
&& meth
->pseudorand
)
163 return meth
->pseudorand(buf
, num
);
168 int RAND_status(void)
170 const RAND_METHOD
*meth
= RAND_get_rand_method();
171 if (meth
&& meth
->status
)
172 return meth
->status();