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authorcvs2svn <admin@example.com>2003-03-22 08:02:04 +0000
committercvs2svn <admin@example.com>2003-03-22 08:02:04 +0000
commitdf32a1286ae06981a79e30b678165a784696be4b (patch)
tree3d70e9a28e2db2eee8cd542ce0ce859502668178 /src/lib/libcrypto/rand/rand_lib.c
parent2850ebd15c3cfddf6fb7edcd08cb6b2c6f717be9 (diff)
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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 <openssl/engine.h>
64
65/* non-NULL if default_RAND_meth is ENGINE-provided */
66static ENGINE *funct_ref =NULL;
67static const RAND_METHOD *default_RAND_meth = NULL;
68
69int RAND_set_rand_method(const RAND_METHOD *meth)
70 {
71 if(funct_ref)
72 {
73 ENGINE_finish(funct_ref);
74 funct_ref = NULL;
75 }
76 default_RAND_meth = meth;
77 return 1;
78 }
79
80const RAND_METHOD *RAND_get_rand_method(void)
81 {
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
102int RAND_set_rand_engine(ENGINE *engine)
103 {
104 const RAND_METHOD *tmp_meth = NULL;
105 if(engine)
106 {
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 }
115 }
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;
120 }
121
122void RAND_cleanup(void)
123 {
124 const RAND_METHOD *meth = RAND_get_rand_method();
125 if (meth && meth->cleanup)
126 meth->cleanup();
127 RAND_set_rand_method(NULL);
128 }
129
130void RAND_seed(const void *buf, int num)
131 {
132 const RAND_METHOD *meth = RAND_get_rand_method();
133 if (meth && meth->seed)
134 meth->seed(buf,num);
135 }
136
137void RAND_add(const void *buf, int num, double entropy)
138 {
139 const RAND_METHOD *meth = RAND_get_rand_method();
140 if (meth && meth->add)
141 meth->add(buf,num,entropy);
142 }
143
144int RAND_bytes(unsigned char *buf, int num)
145 {
146 const RAND_METHOD *meth = RAND_get_rand_method();
147 if (meth && meth->bytes)
148 return meth->bytes(buf,num);
149 return(-1);
150 }
151
152int RAND_pseudo_bytes(unsigned char *buf, int num)
153 {
154 const RAND_METHOD *meth = RAND_get_rand_method();
155 if (meth && meth->pseudorand)
156 return meth->pseudorand(buf,num);
157 return(-1);
158 }
159
160int RAND_status(void)
161 {
162 const RAND_METHOD *meth = RAND_get_rand_method();
163 if (meth && meth->status)
164 return meth->status();
165 return 0;
166 }
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