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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#include "rand_lcl.h"
64#ifdef OPENSSL_FIPS
65#include <openssl/fips.h>
66#include <openssl/fips_rand.h>
67#endif
68
69#ifndef OPENSSL_NO_ENGINE
70#include <openssl/engine.h>
71#endif
72
73static const RAND_METHOD *default_RAND_meth = NULL;
74
75#ifdef OPENSSL_FIPS
76
77static int fips_RAND_set_rand_method(const RAND_METHOD *meth,
78 const RAND_METHOD **pmeth)
79 {
80 *pmeth = meth;
81 return 1;
82 }
83
84static const RAND_METHOD *fips_RAND_get_rand_method(const RAND_METHOD **pmeth)
85 {
86 if (!*pmeth)
87 {
88 if(FIPS_mode())
89 *pmeth=FIPS_rand_method();
90 else
91 *pmeth = RAND_SSLeay();
92 }
93
94 if(FIPS_mode()
95 && *pmeth != FIPS_rand_check())
96 {
97 RANDerr(RAND_F_FIPS_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD);
98 return 0;
99 }
100
101 return *pmeth;
102 }
103
104static int (*RAND_set_rand_method_func)(const RAND_METHOD *meth,
105 const RAND_METHOD **pmeth)
106 = fips_RAND_set_rand_method;
107static const RAND_METHOD *(*RAND_get_rand_method_func)
108 (const RAND_METHOD **pmeth)
109 = fips_RAND_get_rand_method;
110
111#ifndef OPENSSL_NO_ENGINE
112void int_RAND_set_callbacks(
113 int (*set_rand_func)(const RAND_METHOD *meth,
114 const RAND_METHOD **pmeth),
115 const RAND_METHOD *(*get_rand_func)
116 (const RAND_METHOD **pmeth))
117 {
118 RAND_set_rand_method_func = set_rand_func;
119 RAND_get_rand_method_func = get_rand_func;
120 }
121#endif
122
123int RAND_set_rand_method(const RAND_METHOD *meth)
124 {
125 return RAND_set_rand_method_func(meth, &default_RAND_meth);
126 }
127
128const RAND_METHOD *RAND_get_rand_method(void)
129 {
130 return RAND_get_rand_method_func(&default_RAND_meth);
131 }
132
133#else
134
135#ifndef OPENSSL_NO_ENGINE
136/* non-NULL if default_RAND_meth is ENGINE-provided */
137static ENGINE *funct_ref =NULL;
138#endif
139
140int RAND_set_rand_method(const RAND_METHOD *meth)
141 {
142#ifndef OPENSSL_NO_ENGINE
143 if(funct_ref)
144 {
145 ENGINE_finish(funct_ref);
146 funct_ref = NULL;
147 }
148#endif
149 default_RAND_meth = meth;
150 return 1;
151 }
152
153const RAND_METHOD *RAND_get_rand_method(void)
154 {
155 if (!default_RAND_meth)
156 {
157#ifndef OPENSSL_NO_ENGINE
158 ENGINE *e = ENGINE_get_default_RAND();
159 if(e)
160 {
161 default_RAND_meth = ENGINE_get_RAND(e);
162 if(!default_RAND_meth)
163 {
164 ENGINE_finish(e);
165 e = NULL;
166 }
167 }
168 if(e)
169 funct_ref = e;
170 else
171#endif
172 default_RAND_meth = RAND_SSLeay();
173 }
174 return default_RAND_meth;
175 }
176
177#ifndef OPENSSL_NO_ENGINE
178int RAND_set_rand_engine(ENGINE *engine)
179 {
180 const RAND_METHOD *tmp_meth = NULL;
181 if(engine)
182 {
183 if(!ENGINE_init(engine))
184 return 0;
185 tmp_meth = ENGINE_get_RAND(engine);
186 if(!tmp_meth)
187 {
188 ENGINE_finish(engine);
189 return 0;
190 }
191 }
192 /* This function releases any prior ENGINE so call it first */
193 RAND_set_rand_method(tmp_meth);
194 funct_ref = engine;
195 return 1;
196 }
197#endif
198
199#endif
200
201void RAND_cleanup(void)
202 {
203 const RAND_METHOD *meth = RAND_get_rand_method();
204 if (meth && meth->cleanup)
205 meth->cleanup();
206 RAND_set_rand_method(NULL);
207 }
208
209void RAND_seed(const void *buf, int num)
210 {
211 const RAND_METHOD *meth = RAND_get_rand_method();
212 if (meth && meth->seed)
213 meth->seed(buf,num);
214 }
215
216void RAND_add(const void *buf, int num, double entropy)
217 {
218 const RAND_METHOD *meth = RAND_get_rand_method();
219 if (meth && meth->add)
220 meth->add(buf,num,entropy);
221 }
222
223int RAND_bytes(unsigned char *buf, int num)
224 {
225 const RAND_METHOD *meth = RAND_get_rand_method();
226 if (meth && meth->bytes)
227 return meth->bytes(buf,num);
228 return(-1);
229 }
230
231int RAND_pseudo_bytes(unsigned char *buf, int num)
232 {
233 const RAND_METHOD *meth = RAND_get_rand_method();
234 if (meth && meth->pseudorand)
235 return meth->pseudorand(buf,num);
236 return(-1);
237 }
238
239int RAND_status(void)
240 {
241 const RAND_METHOD *meth = RAND_get_rand_method();
242 if (meth && meth->status)
243 return meth->status();
244 return 0;
245 }
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