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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rand/rand_lib.c
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>
63 #ifndef OPENSSL_NO_ENGINE
64 #include <openssl/engine.h>
67 #ifndef OPENSSL_NO_ENGINE
68 /* non-NULL if default_RAND_meth is ENGINE-provided */
69 static ENGINE
*funct_ref
=NULL
;
71 static const RAND_METHOD
*default_RAND_meth
= NULL
;
73 int RAND_set_rand_method(const RAND_METHOD
*meth
)
75 #ifndef OPENSSL_NO_ENGINE
78 ENGINE_finish(funct_ref
);
82 default_RAND_meth
= meth
;
86 const RAND_METHOD
*RAND_get_rand_method(void)
88 if (!default_RAND_meth
)
90 #ifndef OPENSSL_NO_ENGINE
91 ENGINE
*e
= ENGINE_get_default_RAND();
94 default_RAND_meth
= ENGINE_get_RAND(e
);
95 if(!default_RAND_meth
)
105 default_RAND_meth
= RAND_SSLeay();
107 return default_RAND_meth
;
110 #ifndef OPENSSL_NO_ENGINE
111 int RAND_set_rand_engine(ENGINE
*engine
)
113 const RAND_METHOD
*tmp_meth
= NULL
;
116 if(!ENGINE_init(engine
))
118 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
)
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 int RAND_pseudo_bytes(unsigned char *buf
, int num
)
164 const RAND_METHOD
*meth
= RAND_get_rand_method();
165 if (meth
&& meth
->pseudorand
)
166 return meth
->pseudorand(buf
,num
);
170 int RAND_status(void)
172 const RAND_METHOD
*meth
= RAND_get_rand_method();
173 if (meth
&& meth
->status
)
174 return meth
->status();