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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. | |
40720ce3 | 8 | * |
dfeab068 RE |
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). | |
40720ce3 | 15 | * |
dfeab068 RE |
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. | |
40720ce3 | 22 | * |
dfeab068 RE |
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 :-). | |
40720ce3 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
dfeab068 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40720ce3 | 40 | * |
dfeab068 RE |
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. | |
40720ce3 | 52 | * |
dfeab068 RE |
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> |
f4179bea DSH |
63 | #include "rand_lcl.h" |
64 | #ifdef OPENSSL_FIPS | |
40720ce3 MC |
65 | # include <openssl/fips.h> |
66 | # include <openssl/fips_rand.h> | |
f4179bea DSH |
67 | #endif |
68 | ||
0b13e9f0 | 69 | #ifndef OPENSSL_NO_ENGINE |
40720ce3 | 70 | # include <openssl/engine.h> |
0b13e9f0 | 71 | #endif |
dfeab068 | 72 | |
f4179bea DSH |
73 | static const RAND_METHOD *default_RAND_meth = NULL; |
74 | ||
75 | #ifdef OPENSSL_FIPS | |
76 | ||
77 | static int fips_RAND_set_rand_method(const RAND_METHOD *meth, | |
40720ce3 MC |
78 | const RAND_METHOD **pmeth) |
79 | { | |
80 | *pmeth = meth; | |
81 | return 1; | |
82 | } | |
f4179bea DSH |
83 | |
84 | static const RAND_METHOD *fips_RAND_get_rand_method(const RAND_METHOD **pmeth) | |
40720ce3 MC |
85 | { |
86 | if (!*pmeth) { | |
87 | if (FIPS_mode()) | |
88 | *pmeth = FIPS_rand_method(); | |
89 | else | |
90 | *pmeth = RAND_SSLeay(); | |
91 | } | |
92 | ||
93 | if (FIPS_mode() | |
94 | && *pmeth != FIPS_rand_check()) { | |
95 | RANDerr(RAND_F_FIPS_RAND_GET_RAND_METHOD, RAND_R_NON_FIPS_METHOD); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | return *pmeth; | |
100 | } | |
101 | ||
102 | static int (*RAND_set_rand_method_func) (const RAND_METHOD *meth, | |
103 | const RAND_METHOD **pmeth) | |
104 | = fips_RAND_set_rand_method; | |
f4179bea | 105 | static const RAND_METHOD *(*RAND_get_rand_method_func) |
40720ce3 MC |
106 | (const RAND_METHOD **pmeth) |
107 | = fips_RAND_get_rand_method; | |
108 | ||
109 | # ifndef OPENSSL_NO_ENGINE | |
110 | void int_RAND_set_callbacks(int (*set_rand_func) (const RAND_METHOD *meth, | |
111 | const RAND_METHOD **pmeth), | |
112 | const RAND_METHOD *(*get_rand_func) | |
113 | (const RAND_METHOD **pmeth)) | |
114 | { | |
115 | RAND_set_rand_method_func = set_rand_func; | |
116 | RAND_get_rand_method_func = get_rand_func; | |
117 | } | |
118 | # endif | |
f4179bea DSH |
119 | |
120 | int RAND_set_rand_method(const RAND_METHOD *meth) | |
40720ce3 MC |
121 | { |
122 | return RAND_set_rand_method_func(meth, &default_RAND_meth); | |
123 | } | |
f4179bea DSH |
124 | |
125 | const RAND_METHOD *RAND_get_rand_method(void) | |
40720ce3 MC |
126 | { |
127 | return RAND_get_rand_method_func(&default_RAND_meth); | |
128 | } | |
f4179bea DSH |
129 | |
130 | #else | |
131 | ||
40720ce3 | 132 | # ifndef OPENSSL_NO_ENGINE |
cb78486d | 133 | /* non-NULL if default_RAND_meth is ENGINE-provided */ |
40720ce3 MC |
134 | static ENGINE *funct_ref = NULL; |
135 | # endif | |
dfeab068 | 136 | |
cb78486d | 137 | int RAND_set_rand_method(const RAND_METHOD *meth) |
40720ce3 MC |
138 | { |
139 | # ifndef OPENSSL_NO_ENGINE | |
140 | if (funct_ref) { | |
141 | ENGINE_finish(funct_ref); | |
142 | funct_ref = NULL; | |
143 | } | |
144 | # endif | |
145 | default_RAND_meth = meth; | |
146 | return 1; | |
147 | } | |
dfeab068 | 148 | |
a4a9d97a | 149 | const RAND_METHOD *RAND_get_rand_method(void) |
40720ce3 MC |
150 | { |
151 | if (!default_RAND_meth) { | |
152 | # ifndef OPENSSL_NO_ENGINE | |
153 | ENGINE *e = ENGINE_get_default_RAND(); | |
154 | if (e) { | |
155 | default_RAND_meth = ENGINE_get_RAND(e); | |
156 | if (!default_RAND_meth) { | |
157 | ENGINE_finish(e); | |
158 | e = NULL; | |
159 | } | |
160 | } | |
161 | if (e) | |
162 | funct_ref = e; | |
163 | else | |
164 | # endif | |
165 | default_RAND_meth = RAND_SSLeay(); | |
166 | } | |
167 | return default_RAND_meth; | |
168 | } | |
169 | ||
170 | # ifndef OPENSSL_NO_ENGINE | |
cb78486d | 171 | int RAND_set_rand_engine(ENGINE *engine) |
40720ce3 MC |
172 | { |
173 | const RAND_METHOD *tmp_meth = NULL; | |
174 | if (engine) { | |
175 | if (!ENGINE_init(engine)) | |
176 | return 0; | |
177 | tmp_meth = ENGINE_get_RAND(engine); | |
178 | if (!tmp_meth) { | |
179 | ENGINE_finish(engine); | |
180 | return 0; | |
181 | } | |
182 | } | |
183 | /* This function releases any prior ENGINE so call it first */ | |
184 | RAND_set_rand_method(tmp_meth); | |
185 | funct_ref = engine; | |
186 | return 1; | |
187 | } | |
188 | # endif | |
dfeab068 | 189 | |
f4179bea DSH |
190 | #endif |
191 | ||
6b691a5c | 192 | void RAND_cleanup(void) |
40720ce3 MC |
193 | { |
194 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
195 | if (meth && meth->cleanup) | |
196 | meth->cleanup(); | |
197 | RAND_set_rand_method(NULL); | |
198 | } | |
dfeab068 | 199 | |
6b691a5c | 200 | void RAND_seed(const void *buf, int num) |
40720ce3 MC |
201 | { |
202 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
203 | if (meth && meth->seed) | |
204 | meth->seed(buf, num); | |
205 | } | |
dfeab068 | 206 | |
853f757e | 207 | void RAND_add(const void *buf, int num, double entropy) |
40720ce3 MC |
208 | { |
209 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
210 | if (meth && meth->add) | |
211 | meth->add(buf, num, entropy); | |
212 | } | |
eb952088 UM |
213 | |
214 | int RAND_bytes(unsigned char *buf, int num) | |
40720ce3 MC |
215 | { |
216 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
217 | if (meth && meth->bytes) | |
218 | return meth->bytes(buf, num); | |
219 | return (-1); | |
220 | } | |
dfeab068 | 221 | |
373b575f | 222 | int RAND_pseudo_bytes(unsigned char *buf, int num) |
40720ce3 MC |
223 | { |
224 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
225 | if (meth && meth->pseudorand) | |
226 | return meth->pseudorand(buf, num); | |
227 | return (-1); | |
228 | } | |
5eb8ca4d BM |
229 | |
230 | int RAND_status(void) | |
40720ce3 MC |
231 | { |
232 | const RAND_METHOD *meth = RAND_get_rand_method(); | |
233 | if (meth && meth->status) | |
234 | return meth->status(); | |
235 | return 0; | |
236 | } |