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 #include <openssl/engine.h>
65 static ENGINE *rand_engine=NULL;
68 void RAND_set_rand_method(RAND_METHOD *meth)
73 int RAND_set_rand_method(ENGINE *engine)
77 if (engine && !ENGINE_init(engine))
80 /* SHOULD ERROR CHECK THIS!!! */
87 const RAND_METHOD *RAND_get_rand_method(void)
89 if (rand_engine == NULL
90 && (rand_engine = ENGINE_get_default_RAND()) == NULL)
92 RANDerr(RAND_F_RAND_GET_RAND_METHOD,ERR_LIB_ENGINE);
95 return ENGINE_get_RAND(rand_engine);
98 void RAND_cleanup(void)
100 const RAND_METHOD *meth = RAND_get_rand_method();
101 if (meth && meth->cleanup)
105 void RAND_seed(const void *buf, int num)
107 const RAND_METHOD *meth = RAND_get_rand_method();
108 if (meth && meth->seed)
112 void RAND_add(const void *buf, int num, double entropy)
114 const RAND_METHOD *meth = RAND_get_rand_method();
115 if (meth && meth->add)
116 meth->add(buf,num,entropy);
119 int RAND_bytes(unsigned char *buf, int num)
121 const RAND_METHOD *meth = RAND_get_rand_method();
122 if (meth && meth->bytes)
123 return meth->bytes(buf,num);
127 int RAND_pseudo_bytes(unsigned char *buf, int num)
129 const RAND_METHOD *meth = RAND_get_rand_method();
130 if (meth && meth->pseudorand)
131 return meth->pseudorand(buf,num);
135 int RAND_status(void)
137 const RAND_METHOD *meth = RAND_get_rand_method();
138 if (meth && meth->status)
139 return meth->status();