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1/* crypto/rand/rand_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include <time.h>
61#include "cryptlib.h"
62#include <openssl/rand.h>
63#ifndef OPENSSL_NO_ENGINE
64#include <openssl/engine.h>
65#endif
66
67#ifndef OPENSSL_NO_ENGINE
68/* non-NULL if default_RAND_meth is ENGINE-provided */
69static ENGINE *funct_ref =NULL;
70#endif
71static const RAND_METHOD *default_RAND_meth = NULL;
72
73int RAND_set_rand_method(const RAND_METHOD *meth)
74 {
75#ifndef OPENSSL_NO_ENGINE
76 if(funct_ref)
77 {
78 ENGINE_finish(funct_ref);
79 funct_ref = NULL;
80 }
81#endif
82 default_RAND_meth = meth;
83 return 1;
84 }
85
86const RAND_METHOD *RAND_get_rand_method(void)
87 {
88 if (!default_RAND_meth)
89 {
90#ifndef OPENSSL_NO_ENGINE
91 ENGINE *e = ENGINE_get_default_RAND();
92 if(e)
93 {
94 default_RAND_meth = ENGINE_get_RAND(e);
95 if(!default_RAND_meth)
96 {
97 ENGINE_finish(e);
98 e = NULL;
99 }
100 }
101 if(e)
102 funct_ref = e;
103 else
104#endif
105 default_RAND_meth = RAND_SSLeay();
106 }
107 return default_RAND_meth;
108 }
109
110#ifndef OPENSSL_NO_ENGINE
111int RAND_set_rand_engine(ENGINE *engine)
112 {
113 const RAND_METHOD *tmp_meth = NULL;
114 if(engine)
115 {
116 if(!ENGINE_init(engine))
117 return 0;
118 tmp_meth = ENGINE_get_RAND(engine);
119 if(!tmp_meth)
120 {
121 ENGINE_finish(engine);
122 return 0;
123 }
124 }
125 /* This function releases any prior ENGINE so call it first */
126 RAND_set_rand_method(tmp_meth);
127 funct_ref = engine;
128 return 1;
129 }
130#endif
131
132void RAND_cleanup(void)
133 {
134 const RAND_METHOD *meth = RAND_get_rand_method();
135 if (meth && meth->cleanup)
136 meth->cleanup();
137 RAND_set_rand_method(NULL);
138 }
139
140void RAND_seed(const void *buf, int num)
141 {
142 const RAND_METHOD *meth = RAND_get_rand_method();
143 if (meth && meth->seed)
144 meth->seed(buf,num);
145 }
146
147void RAND_add(const void *buf, int num, double entropy)
148 {
149 const RAND_METHOD *meth = RAND_get_rand_method();
150 if (meth && meth->add)
151 meth->add(buf,num,entropy);
152 }
153
154int RAND_bytes(unsigned char *buf, int num)
155 {
156 const RAND_METHOD *meth = RAND_get_rand_method();
157 if (meth && meth->bytes)
158 return meth->bytes(buf,num);
159 return(-1);
160 }
161
162int RAND_pseudo_bytes(unsigned char *buf, int num)
163 {
164 const RAND_METHOD *meth = RAND_get_rand_method();
165 if (meth && meth->pseudorand)
166 return meth->pseudorand(buf,num);
167 return(-1);
168 }
169
170int RAND_status(void)
171 {
172 const RAND_METHOD *meth = RAND_get_rand_method();
173 if (meth && meth->status)
174 return meth->status();
175 return 0;
176 }
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