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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 "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 | |
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 | |
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 | |
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 | |
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 | |
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