Line data Source code
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 :
64 : #ifndef OPENSSL_NO_ENGINE
65 : # include <openssl/engine.h>
66 : #endif
67 :
68 : #ifdef OPENSSL_FIPS
69 : # include <openssl/fips.h>
70 : # include <openssl/fips_rand.h>
71 : # include "rand_lcl.h"
72 : #endif
73 :
74 : #ifndef OPENSSL_NO_ENGINE
75 : /* non-NULL if default_RAND_meth is ENGINE-provided */
76 : static ENGINE *funct_ref = NULL;
77 : #endif
78 : static const RAND_METHOD *default_RAND_meth = NULL;
79 :
80 0 : int RAND_set_rand_method(const RAND_METHOD *meth)
81 : {
82 : #ifndef OPENSSL_NO_ENGINE
83 0 : if (funct_ref) {
84 0 : ENGINE_finish(funct_ref);
85 0 : funct_ref = NULL;
86 : }
87 : #endif
88 0 : default_RAND_meth = meth;
89 0 : return 1;
90 : }
91 :
92 11259 : const RAND_METHOD *RAND_get_rand_method(void)
93 : {
94 11259 : if (!default_RAND_meth) {
95 : #ifndef OPENSSL_NO_ENGINE
96 124 : ENGINE *e = ENGINE_get_default_RAND();
97 124 : if (e) {
98 0 : default_RAND_meth = ENGINE_get_RAND(e);
99 0 : if (!default_RAND_meth) {
100 0 : ENGINE_finish(e);
101 : e = NULL;
102 : }
103 : }
104 124 : if (e)
105 0 : funct_ref = e;
106 : else
107 : #endif
108 124 : default_RAND_meth = RAND_SSLeay();
109 : }
110 11259 : return default_RAND_meth;
111 : }
112 :
113 : #ifndef OPENSSL_NO_ENGINE
114 0 : int RAND_set_rand_engine(ENGINE *engine)
115 : {
116 : const RAND_METHOD *tmp_meth = NULL;
117 0 : if (engine) {
118 0 : if (!ENGINE_init(engine))
119 : return 0;
120 0 : tmp_meth = ENGINE_get_RAND(engine);
121 0 : if (!tmp_meth) {
122 0 : ENGINE_finish(engine);
123 0 : return 0;
124 : }
125 : }
126 : /* This function releases any prior ENGINE so call it first */
127 : RAND_set_rand_method(tmp_meth);
128 0 : funct_ref = engine;
129 0 : return 1;
130 : }
131 : #endif
132 :
133 0 : void RAND_cleanup(void)
134 : {
135 0 : const RAND_METHOD *meth = RAND_get_rand_method();
136 0 : if (meth && meth->cleanup)
137 0 : meth->cleanup();
138 : RAND_set_rand_method(NULL);
139 0 : }
140 :
141 0 : void RAND_seed(const void *buf, int num)
142 : {
143 0 : const RAND_METHOD *meth = RAND_get_rand_method();
144 0 : if (meth && meth->seed)
145 0 : meth->seed(buf, num);
146 0 : }
147 :
148 4396 : void RAND_add(const void *buf, int num, double entropy)
149 : {
150 4396 : const RAND_METHOD *meth = RAND_get_rand_method();
151 4396 : if (meth && meth->add)
152 4396 : meth->add(buf, num, entropy);
153 4396 : }
154 :
155 4859 : int RAND_bytes(unsigned char *buf, int num)
156 : {
157 4859 : const RAND_METHOD *meth = RAND_get_rand_method();
158 4859 : if (meth && meth->bytes)
159 4859 : return meth->bytes(buf, num);
160 : return (-1);
161 : }
162 :
163 1659 : int RAND_pseudo_bytes(unsigned char *buf, int num)
164 : {
165 1659 : const RAND_METHOD *meth = RAND_get_rand_method();
166 1659 : if (meth && meth->pseudorand)
167 1659 : return meth->pseudorand(buf, num);
168 : return (-1);
169 : }
170 :
171 345 : int RAND_status(void)
172 : {
173 345 : const RAND_METHOD *meth = RAND_get_rand_method();
174 345 : if (meth && meth->status)
175 345 : return meth->status();
176 : return 0;
177 : }
178 :
179 : #ifdef OPENSSL_FIPS
180 :
181 : /*
182 : * FIPS DRBG initialisation code. This sets up the DRBG for use by the rest
183 : * of OpenSSL.
184 : */
185 :
186 : /*
187 : * Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather
188 : * entropy internally through RAND_poll().
189 : */
190 :
191 : static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout,
192 : int entropy, size_t min_len, size_t max_len)
193 : {
194 : /* Round up request to multiple of block size */
195 : min_len = ((min_len + 19) / 20) * 20;
196 : *pout = OPENSSL_malloc(min_len);
197 : if (!*pout)
198 : return 0;
199 : if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) {
200 : OPENSSL_free(*pout);
201 : *pout = NULL;
202 : return 0;
203 : }
204 : return min_len;
205 : }
206 :
207 : static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen)
208 : {
209 : if (out) {
210 : OPENSSL_cleanse(out, olen);
211 : OPENSSL_free(out);
212 : }
213 : }
214 :
215 : /*
216 : * Set "additional input" when generating random data. This uses the current
217 : * PID, a time value and a counter.
218 : */
219 :
220 : static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout)
221 : {
222 : /* Use of static variables is OK as this happens under a lock */
223 : static unsigned char buf[16];
224 : static unsigned long counter;
225 : FIPS_get_timevec(buf, &counter);
226 : *pout = buf;
227 : return sizeof(buf);
228 : }
229 :
230 : /*
231 : * RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is
232 : * correctly seeded by RAND_poll().
233 : */
234 :
235 : static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen,
236 : double entropy)
237 : {
238 : RAND_SSLeay()->add(in, inlen, entropy);
239 : return 1;
240 : }
241 :
242 : static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen)
243 : {
244 : RAND_SSLeay()->seed(in, inlen);
245 : return 1;
246 : }
247 :
248 : # ifndef OPENSSL_DRBG_DEFAULT_TYPE
249 : # define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr
250 : # endif
251 : # ifndef OPENSSL_DRBG_DEFAULT_FLAGS
252 : # define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF
253 : # endif
254 :
255 : static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE;
256 : static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS;
257 :
258 : void RAND_set_fips_drbg_type(int type, int flags)
259 : {
260 : fips_drbg_type = type;
261 : fips_drbg_flags = flags;
262 : }
263 :
264 : int RAND_init_fips(void)
265 : {
266 : DRBG_CTX *dctx;
267 : size_t plen;
268 : unsigned char pers[32], *p;
269 : # ifndef OPENSSL_ALLOW_DUAL_EC_DRBG
270 : if (fips_drbg_type >> 16) {
271 : RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED);
272 : return 0;
273 : }
274 : # endif
275 :
276 : dctx = FIPS_get_default_drbg();
277 : if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) {
278 : RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG);
279 : return 0;
280 : }
281 :
282 : FIPS_drbg_set_callbacks(dctx,
283 : drbg_get_entropy, drbg_free_entropy, 20,
284 : drbg_get_entropy, drbg_free_entropy);
285 : FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0,
286 : drbg_rand_seed, drbg_rand_add);
287 : /* Personalisation string: a string followed by date time vector */
288 : strcpy((char *)pers, "OpenSSL DRBG2.0");
289 : plen = drbg_get_adin(dctx, &p);
290 : memcpy(pers + 16, p, plen);
291 :
292 : if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) {
293 : RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG);
294 : return 0;
295 : }
296 : FIPS_rand_set_method(FIPS_drbg_method());
297 : return 1;
298 : }
299 :
300 : #endif
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