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 "rand_lcl.h"
63 #include <openssl/rand.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
73 #if defined(OPENSSL_FIPS) && !defined(OPENSSL_NO_ENGINE)
74
75 /* non-NULL if default_RAND_meth is ENGINE-provided */
76 static ENGINE *funct_ref =NULL;
77
eng_RAND_set_rand_method(const RAND_METHOD * meth,const RAND_METHOD ** pmeth)78 int eng_RAND_set_rand_method(const RAND_METHOD *meth, const RAND_METHOD **pmeth)
79 {
80 if(funct_ref)
81 {
82 ENGINE_finish(funct_ref);
83 funct_ref = NULL;
84 }
85 *pmeth = meth;
86 return 1;
87 }
88
eng_RAND_get_rand_method(const RAND_METHOD ** pmeth)89 const RAND_METHOD *eng_RAND_get_rand_method(const RAND_METHOD **pmeth)
90 {
91 if (!*pmeth)
92 {
93 ENGINE *e = ENGINE_get_default_RAND();
94 if(e)
95 {
96 *pmeth = ENGINE_get_RAND(e);
97 if(!*pmeth)
98 {
99 ENGINE_finish(e);
100 e = NULL;
101 }
102 }
103 if(e)
104 funct_ref = e;
105 else
106 if(FIPS_mode())
107 *pmeth=FIPS_rand_method();
108 else
109 *pmeth = RAND_SSLeay();
110 }
111
112 if(FIPS_mode()
113 && *pmeth != FIPS_rand_check())
114 {
115 RANDerr(RAND_F_ENG_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD);
116 return 0;
117 }
118
119 return *pmeth;
120 }
121
RAND_set_rand_engine(ENGINE * engine)122 int RAND_set_rand_engine(ENGINE *engine)
123 {
124 const RAND_METHOD *tmp_meth = NULL;
125 if(engine)
126 {
127 if(!ENGINE_init(engine))
128 return 0;
129 tmp_meth = ENGINE_get_RAND(engine);
130 if(!tmp_meth)
131 {
132 ENGINE_finish(engine);
133 return 0;
134 }
135 }
136 /* This function releases any prior ENGINE so call it first */
137 RAND_set_rand_method(tmp_meth);
138 funct_ref = engine;
139 return 1;
140 }
141
int_RAND_init_engine_callbacks(void)142 void int_RAND_init_engine_callbacks(void)
143 {
144 static int done = 0;
145 if (done)
146 return;
147 int_RAND_set_callbacks(eng_RAND_set_rand_method,
148 eng_RAND_get_rand_method);
149 done = 1;
150 }
151
152 #endif
153