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dfeab068 RE |
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> | |
dfeab068 | 60 | #include <time.h> |
7ae551fd | 61 | #include "cryptlib.h" |
ec577822 | 62 | #include <openssl/rand.h> |
5270e702 | 63 | #include <openssl/engine.h> |
dfeab068 | 64 | |
cb78486d GT |
65 | /* non-NULL if default_RAND_meth is ENGINE-provided */ |
66 | static ENGINE *funct_ref =NULL; | |
67 | static const RAND_METHOD *default_RAND_meth = NULL; | |
dfeab068 | 68 | |
cb78486d | 69 | int RAND_set_rand_method(const RAND_METHOD *meth) |
dfeab068 | 70 | { |
cb78486d GT |
71 | if(funct_ref) |
72 | { | |
73 | ENGINE_finish(funct_ref); | |
74 | funct_ref = NULL; | |
75 | } | |
76 | default_RAND_meth = meth; | |
5270e702 RL |
77 | return 1; |
78 | } | |
dfeab068 | 79 | |
a4a9d97a | 80 | const RAND_METHOD *RAND_get_rand_method(void) |
dfeab068 | 81 | { |
cb78486d GT |
82 | if (!default_RAND_meth) |
83 | { | |
84 | ENGINE *e = ENGINE_get_default_RAND(); | |
85 | if(e) | |
86 | { | |
87 | default_RAND_meth = ENGINE_get_RAND(e); | |
88 | if(!default_RAND_meth) | |
89 | { | |
90 | ENGINE_finish(e); | |
91 | e = NULL; | |
92 | } | |
93 | } | |
94 | if(e) | |
95 | funct_ref = e; | |
96 | else | |
97 | default_RAND_meth = RAND_SSLeay(); | |
98 | } | |
99 | return default_RAND_meth; | |
100 | } | |
101 | ||
102 | int RAND_set_rand_engine(ENGINE *engine) | |
103 | { | |
104 | const RAND_METHOD *tmp_meth = NULL; | |
105 | if(engine) | |
7ae551fd | 106 | { |
cb78486d GT |
107 | if(!ENGINE_init(engine)) |
108 | return 0; | |
109 | tmp_meth = ENGINE_get_RAND(engine); | |
110 | if(!tmp_meth) | |
111 | { | |
112 | ENGINE_finish(engine); | |
113 | return 0; | |
114 | } | |
7ae551fd | 115 | } |
cb78486d GT |
116 | /* This function releases any prior ENGINE so call it first */ |
117 | RAND_set_rand_method(tmp_meth); | |
118 | funct_ref = engine; | |
119 | return 1; | |
dfeab068 RE |
120 | } |
121 | ||
6b691a5c | 122 | void RAND_cleanup(void) |
dfeab068 | 123 | { |
a4a9d97a | 124 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
125 | if (meth && meth->cleanup) |
126 | meth->cleanup(); | |
cb78486d | 127 | RAND_set_rand_method(NULL); |
dfeab068 RE |
128 | } |
129 | ||
6b691a5c | 130 | void RAND_seed(const void *buf, int num) |
dfeab068 | 131 | { |
a4a9d97a | 132 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
133 | if (meth && meth->seed) |
134 | meth->seed(buf,num); | |
dfeab068 RE |
135 | } |
136 | ||
853f757e | 137 | void RAND_add(const void *buf, int num, double entropy) |
dfeab068 | 138 | { |
a4a9d97a | 139 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
140 | if (meth && meth->add) |
141 | meth->add(buf,num,entropy); | |
eb952088 UM |
142 | } |
143 | ||
144 | int RAND_bytes(unsigned char *buf, int num) | |
145 | { | |
a4a9d97a | 146 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
147 | if (meth && meth->bytes) |
148 | return meth->bytes(buf,num); | |
eb952088 | 149 | return(-1); |
dfeab068 RE |
150 | } |
151 | ||
373b575f UM |
152 | int RAND_pseudo_bytes(unsigned char *buf, int num) |
153 | { | |
a4a9d97a | 154 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
155 | if (meth && meth->pseudorand) |
156 | return meth->pseudorand(buf,num); | |
373b575f UM |
157 | return(-1); |
158 | } | |
5eb8ca4d BM |
159 | |
160 | int RAND_status(void) | |
161 | { | |
a4a9d97a | 162 | const RAND_METHOD *meth = RAND_get_rand_method(); |
5270e702 RL |
163 | if (meth && meth->status) |
164 | return meth->status(); | |
5eb8ca4d BM |
165 | return 0; |
166 | } |