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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#include <openssl/fips.h>
67#include <openssl/fips_rand.h>
68
69#ifndef OPENSSL_NO_ENGINE
70/* non-NULL if default_RAND_meth is ENGINE-provided */
71static ENGINE *funct_ref =NULL;
72#endif
73static const RAND_METHOD *default_RAND_meth = NULL;
74
75int RAND_set_rand_method(const RAND_METHOD *meth)
76 {
77#ifndef OPENSSL_NO_ENGINE
78 if(funct_ref)
79 {
80 ENGINE_finish(funct_ref);
81 funct_ref = NULL;
82 }
83#endif
84 default_RAND_meth = meth;
85 return 1;
86 }
87
88const RAND_METHOD *RAND_get_rand_method(void)
89 {
90 if (!default_RAND_meth)
91 {
92#ifndef OPENSSL_NO_ENGINE
93 ENGINE *e = ENGINE_get_default_RAND();
94 if(e)
95 {
96 default_RAND_meth = ENGINE_get_RAND(e);
97 if(!default_RAND_meth)
98 {
99 ENGINE_finish(e);
100 e = NULL;
101 }
102 }
103 if(e)
104 funct_ref = e;
105 else
106#endif
107#ifdef OPENSSL_FIPS
108 if(FIPS_mode())
109 default_RAND_meth=FIPS_rand_method();
110 else
111#endif
112 default_RAND_meth = RAND_SSLeay();
113 }
114
115#ifdef OPENSSL_FIPS
116 if(FIPS_mode()
117 && default_RAND_meth != FIPS_rand_check())
118 {
119 RANDerr(RAND_F_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD);
120 return 0;
121 }
122#endif
123 return default_RAND_meth;
124 }
125
126#ifndef OPENSSL_NO_ENGINE
127int RAND_set_rand_engine(ENGINE *engine)
128 {
129 const RAND_METHOD *tmp_meth = NULL;
130 if(engine)
131 {
132 if(!ENGINE_init(engine))
133 return 0;
134 tmp_meth = ENGINE_get_RAND(engine);
135 if(!tmp_meth)
136 {
137 ENGINE_finish(engine);
138 return 0;
139 }
140 }
141 /* This function releases any prior ENGINE so call it first */
142 RAND_set_rand_method(tmp_meth);
143 funct_ref = engine;
144 return 1;
145 }
146#endif
147
148void RAND_cleanup(void)
149 {
150 const RAND_METHOD *meth = RAND_get_rand_method();
151 if (meth && meth->cleanup)
152 meth->cleanup();
153 RAND_set_rand_method(NULL);
154 }
155
156void RAND_seed(const void *buf, int num)
157 {
158 const RAND_METHOD *meth = RAND_get_rand_method();
159 if (meth && meth->seed)
160 meth->seed(buf,num);
161 }
162
163void RAND_add(const void *buf, int num, double entropy)
164 {
165 const RAND_METHOD *meth = RAND_get_rand_method();
166 if (meth && meth->add)
167 meth->add(buf,num,entropy);
168 }
169
170int RAND_bytes(unsigned char *buf, int num)
171 {
172 const RAND_METHOD *meth = RAND_get_rand_method();
173 if (meth && meth->bytes)
174 return meth->bytes(buf,num);
175 return(-1);
176 }
177
178int RAND_pseudo_bytes(unsigned char *buf, int num)
179 {
180 const RAND_METHOD *meth = RAND_get_rand_method();
181 if (meth && meth->pseudorand)
182 return meth->pseudorand(buf,num);
183 return(-1);
184 }
185
186int RAND_status(void)
187 {
188 const RAND_METHOD *meth = RAND_get_rand_method();
189 if (meth && meth->status)
190 return meth->status();
191 return 0;
192 }
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