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12fb8c3d | 1 | /* |
3c7d0945 | 2 | * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved. |
12fb8c3d RS |
3 | * |
4 | * Licensed under the OpenSSL license (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include <string.h> | |
11 | #include <openssl/crypto.h> | |
12 | #include <openssl/err.h> | |
13 | #include <openssl/rand.h> | |
14 | #include "rand_lcl.h" | |
0b14a5b7 KR |
15 | #include "internal/thread_once.h" |
16 | #include "internal/rand_int.h" | |
12fb8c3d RS |
17 | |
18 | /* | |
19 | * Support framework for NIST SP 800-90A DRBG, AES-CTR mode. | |
75e2c877 RS |
20 | * The RAND_DRBG is OpenSSL's pointer to an instance of the DRBG. |
21 | * | |
12fb8c3d RS |
22 | * The OpenSSL model is to have new and free functions, and that new |
23 | * does all initialization. That is not the NIST model, which has | |
24 | * instantiation and un-instantiate, and re-use within a new/free | |
25 | * lifecycle. (No doubt this comes from the desire to support hardware | |
26 | * DRBG, where allocation of resources on something like an HSM is | |
27 | * a much bigger deal than just re-setting an allocated resource.) | |
12fb8c3d RS |
28 | */ |
29 | ||
a93ba405 DMSP |
30 | /* |
31 | * THE THREE SHARED DRBGs | |
32 | * | |
33 | * There are three shared DRBGs (master, public and private), which are | |
34 | * accessed concurrently by all threads. | |
35 | * | |
36 | * THE MASTER DRBG | |
37 | * | |
38 | * Not used directly by the application, only for reseeding the two other | |
39 | * DRBGs. It reseeds itself by pulling either randomness from os entropy | |
40 | * sources or by consuming randomnes which was added by RAND_add() | |
41 | */ | |
933033b6 | 42 | static RAND_DRBG *drbg_master; |
a93ba405 DMSP |
43 | /* |
44 | * THE PUBLIC DRBG | |
45 | * | |
46 | * Used by default for generating random bytes using RAND_bytes(). | |
47 | */ | |
933033b6 | 48 | static RAND_DRBG *drbg_public; |
a93ba405 DMSP |
49 | /* |
50 | * THE PRIVATE DRBG | |
51 | * | |
52 | * Used by default for generating private keys using RAND_priv_bytes() | |
53 | */ | |
933033b6 | 54 | static RAND_DRBG *drbg_private; |
a93ba405 DMSP |
55 | /*+ |
56 | * DRBG HIERARCHY | |
57 | * | |
58 | * In addition there are DRBGs, which are not shared, but used only by a | |
59 | * single thread at every time, for example the DRBGs which are owned by | |
60 | * an SSL context. All DRBGs are organized in a hierarchical fashion | |
61 | * with the <master> DRBG as root. | |
62 | * | |
63 | * This gives the following overall picture: | |
64 | * | |
65 | * <os entropy sources> | |
66 | * | | |
67 | * RAND_add() ==> <master> \ | |
68 | * / \ | shared DRBGs (with locking) | |
69 | * <public> <private> / | |
70 | * | | |
71 | * <ssl> owned by an SSL context | |
72 | * | |
73 | * AUTOMATIC RESEEDING | |
74 | * | |
08a65d96 DMSP |
75 | * Before satisfying a generate request, a DRBG reseeds itself automatically, |
76 | * if one of the following two conditions holds: | |
77 | * | |
78 | * - the number of generate requests since the last reseeding exceeds a | |
79 | * certain threshold, the so called |reseed_interval|. This behaviour | |
80 | * can be disabled by setting the |reseed_interval| to 0. | |
81 | * | |
82 | * - the time elapsed since the last reseeding exceeds a certain time | |
83 | * interval, the so called |reseed_time_interval|. This behaviour | |
84 | * can be disabled by setting the |reseed_time_interval| to 0. | |
a93ba405 DMSP |
85 | * |
86 | * MANUAL RESEEDING | |
87 | * | |
08a65d96 DMSP |
88 | * For the three shared DRBGs (and only for these) there is another way to |
89 | * reseed them manually by calling RAND_seed() (or RAND_add() with a positive | |
a93ba405 | 90 | * |randomness| argument). This will immediately reseed the <master> DRBG. |
08a65d96 DMSP |
91 | * The <public> and <private> DRBG will detect this on their next generate |
92 | * call and reseed, pulling randomness from <master>. | |
3ce1c27b DMSP |
93 | * |
94 | * LOCKING | |
95 | * | |
96 | * The three shared DRBGs are intended to be used concurrently, so they | |
812b1537 DMSP |
97 | * support locking. The RAND methods take the locks automatically, so using |
98 | * the RAND api (in particular RAND_bytes() and RAND_priv_bytes()) is | |
99 | * thread-safe. Note however that accessing the shared DRBGs directly via | |
100 | * the RAND_DRBG interface is *not* thread-safe. | |
101 | * | |
102 | * All other DRBG instances don't support locking, because they are | |
103 | * intendended to be used by a single thread. Instead of accessing a single | |
104 | * DRBG instance concurrently from different threads, it is recommended to | |
105 | * instantiate a separate DRBG instance per thread. Using the same shared | |
106 | * DRBG (preferrably the public DRBG) as parent of DRBG instances on | |
107 | * different threads is safe. | |
a93ba405 DMSP |
108 | */ |
109 | ||
110 | ||
111 | /* NIST SP 800-90A DRBG recommends the use of a personalization string. */ | |
112 | static const char ossl_pers_string[] = "OpenSSL NIST SP 800-90A DRBG"; | |
113 | ||
c16de9d8 DMSP |
114 | static CRYPTO_ONCE rand_drbg_init = CRYPTO_ONCE_STATIC_INIT; |
115 | ||
63ab5ea1 | 116 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent); |
4f9dabbf DMSP |
117 | |
118 | static RAND_DRBG *rand_drbg_new(int secure, | |
119 | int type, | |
120 | unsigned int flags, | |
121 | RAND_DRBG *parent); | |
0b14a5b7 | 122 | |
12fb8c3d | 123 | /* |
75e2c877 | 124 | * Set/initialize |drbg| to be of type |nid|, with optional |flags|. |
efb8128a DMSP |
125 | * |
126 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 127 | */ |
75e2c877 | 128 | int RAND_DRBG_set(RAND_DRBG *drbg, int nid, unsigned int flags) |
12fb8c3d RS |
129 | { |
130 | int ret = 1; | |
131 | ||
75e2c877 RS |
132 | drbg->state = DRBG_UNINITIALISED; |
133 | drbg->flags = flags; | |
134 | drbg->nid = nid; | |
12fb8c3d RS |
135 | |
136 | switch (nid) { | |
137 | default: | |
138 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE); | |
efb8128a | 139 | return 0; |
12fb8c3d RS |
140 | case 0: |
141 | /* Uninitialized; that's okay. */ | |
142 | return 1; | |
143 | case NID_aes_128_ctr: | |
144 | case NID_aes_192_ctr: | |
145 | case NID_aes_256_ctr: | |
8212d505 | 146 | ret = drbg_ctr_init(drbg); |
12fb8c3d RS |
147 | break; |
148 | } | |
149 | ||
efb8128a | 150 | if (ret == 0) |
12fb8c3d RS |
151 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_ERROR_INITIALISING_DRBG); |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* | |
4f9dabbf DMSP |
156 | * Allocate memory and initialize a new DRBG. The DRBG is allocated on |
157 | * the secure heap if |secure| is nonzero and the secure heap is enabled. | |
158 | * The |parent|, if not NULL, will be used as random source for reseeding. | |
a93ba405 DMSP |
159 | * |
160 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
12fb8c3d | 161 | */ |
4f9dabbf DMSP |
162 | static RAND_DRBG *rand_drbg_new(int secure, |
163 | int type, | |
164 | unsigned int flags, | |
165 | RAND_DRBG *parent) | |
12fb8c3d | 166 | { |
4f9dabbf DMSP |
167 | RAND_DRBG *drbg = secure ? |
168 | OPENSSL_secure_zalloc(sizeof(*drbg)) : OPENSSL_zalloc(sizeof(*drbg)); | |
12fb8c3d | 169 | |
9d951a78 | 170 | if (drbg == NULL) { |
12fb8c3d | 171 | RANDerr(RAND_F_RAND_DRBG_NEW, ERR_R_MALLOC_FAILURE); |
75e2c877 | 172 | goto err; |
12fb8c3d | 173 | } |
4f9dabbf DMSP |
174 | |
175 | drbg->secure = secure && CRYPTO_secure_allocated(drbg); | |
a35f607c | 176 | drbg->fork_count = rand_fork_count; |
75e2c877 | 177 | drbg->parent = parent; |
efb8128a | 178 | if (RAND_DRBG_set(drbg, type, flags) == 0) |
75e2c877 RS |
179 | goto err; |
180 | ||
a93ba405 DMSP |
181 | if (!RAND_DRBG_set_callbacks(drbg, rand_drbg_get_entropy, |
182 | rand_drbg_cleanup_entropy, | |
183 | NULL, NULL)) | |
184 | goto err; | |
75e2c877 RS |
185 | |
186 | return drbg; | |
187 | ||
188 | err: | |
4f9dabbf DMSP |
189 | if (drbg->secure) |
190 | OPENSSL_secure_free(drbg); | |
191 | else | |
192 | OPENSSL_free(drbg); | |
193 | ||
75e2c877 | 194 | return NULL; |
12fb8c3d RS |
195 | } |
196 | ||
4f9dabbf DMSP |
197 | RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) |
198 | { | |
199 | return rand_drbg_new(0, type, flags, parent); | |
200 | } | |
201 | ||
202 | RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent) | |
203 | { | |
204 | return rand_drbg_new(1, type, flags, parent); | |
205 | } | |
206 | ||
12fb8c3d | 207 | /* |
75e2c877 | 208 | * Uninstantiate |drbg| and free all memory. |
12fb8c3d | 209 | */ |
75e2c877 | 210 | void RAND_DRBG_free(RAND_DRBG *drbg) |
12fb8c3d | 211 | { |
c16de9d8 | 212 | if (drbg == NULL) |
12fb8c3d RS |
213 | return; |
214 | ||
8212d505 DMSP |
215 | if (drbg->meth != NULL) |
216 | drbg->meth->uninstantiate(drbg); | |
4f9dabbf | 217 | CRYPTO_THREAD_lock_free(drbg->lock); |
75e2c877 | 218 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data); |
4f9dabbf DMSP |
219 | |
220 | if (drbg->secure) | |
221 | OPENSSL_secure_clear_free(drbg, sizeof(*drbg)); | |
222 | else | |
223 | OPENSSL_clear_free(drbg, sizeof(*drbg)); | |
12fb8c3d RS |
224 | } |
225 | ||
226 | /* | |
75e2c877 | 227 | * Instantiate |drbg|, after it has been initialized. Use |pers| and |
12fb8c3d | 228 | * |perslen| as prediction-resistance input. |
2139145b BK |
229 | * |
230 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
231 | * |
232 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 233 | */ |
75e2c877 | 234 | int RAND_DRBG_instantiate(RAND_DRBG *drbg, |
12fb8c3d RS |
235 | const unsigned char *pers, size_t perslen) |
236 | { | |
12fb8c3d | 237 | unsigned char *nonce = NULL, *entropy = NULL; |
aa048aef | 238 | size_t noncelen = 0, entropylen = 0; |
12fb8c3d | 239 | |
aa048aef | 240 | if (perslen > drbg->max_perslen) { |
75e2c877 RS |
241 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
242 | RAND_R_PERSONALISATION_STRING_TOO_LONG); | |
12fb8c3d RS |
243 | goto end; |
244 | } | |
8212d505 DMSP |
245 | |
246 | if (drbg->meth == NULL) | |
247 | { | |
248 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
249 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
250 | goto end; | |
251 | } | |
252 | ||
75e2c877 RS |
253 | if (drbg->state != DRBG_UNINITIALISED) { |
254 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
255 | drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE | |
256 | : RAND_R_ALREADY_INSTANTIATED); | |
12fb8c3d RS |
257 | goto end; |
258 | } | |
259 | ||
75e2c877 RS |
260 | drbg->state = DRBG_ERROR; |
261 | if (drbg->get_entropy != NULL) | |
aa048aef DMSP |
262 | entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
263 | drbg->min_entropylen, drbg->max_entropylen); | |
c16de9d8 DMSP |
264 | if (entropylen < drbg->min_entropylen |
265 | || entropylen > drbg->max_entropylen) { | |
75e2c877 | 266 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
267 | goto end; |
268 | } | |
269 | ||
aa048aef | 270 | if (drbg->max_noncelen > 0 && drbg->get_nonce != NULL) { |
75e2c877 | 271 | noncelen = drbg->get_nonce(drbg, &nonce, drbg->strength / 2, |
aa048aef DMSP |
272 | drbg->min_noncelen, drbg->max_noncelen); |
273 | if (noncelen < drbg->min_noncelen || noncelen > drbg->max_noncelen) { | |
c16de9d8 DMSP |
274 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
275 | RAND_R_ERROR_RETRIEVING_NONCE); | |
12fb8c3d RS |
276 | goto end; |
277 | } | |
278 | } | |
279 | ||
8212d505 | 280 | if (!drbg->meth->instantiate(drbg, entropy, entropylen, |
12fb8c3d | 281 | nonce, noncelen, pers, perslen)) { |
75e2c877 | 282 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_INSTANTIATING_DRBG); |
12fb8c3d RS |
283 | goto end; |
284 | } | |
285 | ||
75e2c877 | 286 | drbg->state = DRBG_READY; |
a93ba405 | 287 | drbg->generate_counter = 0; |
08a65d96 | 288 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
289 | if (drbg->reseed_counter > 0) { |
290 | if (drbg->parent == NULL) | |
291 | drbg->reseed_counter++; | |
292 | else | |
293 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
294 | } | |
12fb8c3d RS |
295 | |
296 | end: | |
75e2c877 | 297 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 298 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 299 | if (nonce != NULL && drbg->cleanup_nonce!= NULL ) |
6969a3f4 | 300 | drbg->cleanup_nonce(drbg, nonce, noncelen); |
c16de9d8 DMSP |
301 | if (drbg->pool != NULL) { |
302 | if (drbg->state == DRBG_READY) { | |
303 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
304 | RAND_R_ERROR_ENTROPY_POOL_WAS_IGNORED); | |
305 | drbg->state = DRBG_ERROR; | |
306 | } | |
307 | RAND_POOL_free(drbg->pool); | |
308 | drbg->pool = NULL; | |
309 | } | |
75e2c877 | 310 | if (drbg->state == DRBG_READY) |
12fb8c3d | 311 | return 1; |
12fb8c3d RS |
312 | return 0; |
313 | } | |
314 | ||
315 | /* | |
75e2c877 | 316 | * Uninstantiate |drbg|. Must be instantiated before it can be used. |
2139145b BK |
317 | * |
318 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
319 | * |
320 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 321 | */ |
75e2c877 | 322 | int RAND_DRBG_uninstantiate(RAND_DRBG *drbg) |
12fb8c3d | 323 | { |
8212d505 DMSP |
324 | if (drbg->meth == NULL) |
325 | { | |
326 | RANDerr(RAND_F_RAND_DRBG_UNINSTANTIATE, | |
327 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
328 | return 0; | |
329 | } | |
330 | ||
efb8128a DMSP |
331 | /* Clear the entire drbg->ctr struct, then reset some important |
332 | * members of the drbg->ctr struct (e.g. keysize, df_ks) to their | |
333 | * initial values. | |
334 | */ | |
8212d505 | 335 | drbg->meth->uninstantiate(drbg); |
efb8128a | 336 | return RAND_DRBG_set(drbg, drbg->nid, drbg->flags); |
12fb8c3d RS |
337 | } |
338 | ||
339 | /* | |
c16de9d8 | 340 | * Reseed |drbg|, mixing in the specified data |
2139145b BK |
341 | * |
342 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
343 | * |
344 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 345 | */ |
75e2c877 | 346 | int RAND_DRBG_reseed(RAND_DRBG *drbg, |
12fb8c3d RS |
347 | const unsigned char *adin, size_t adinlen) |
348 | { | |
349 | unsigned char *entropy = NULL; | |
aa048aef | 350 | size_t entropylen = 0; |
75e2c877 RS |
351 | |
352 | if (drbg->state == DRBG_ERROR) { | |
353 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_IN_ERROR_STATE); | |
354 | return 0; | |
355 | } | |
356 | if (drbg->state == DRBG_UNINITIALISED) { | |
357 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_NOT_INSTANTIATED); | |
358 | return 0; | |
12fb8c3d RS |
359 | } |
360 | ||
361 | if (adin == NULL) | |
362 | adinlen = 0; | |
aa048aef | 363 | else if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
364 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
365 | return 0; | |
12fb8c3d RS |
366 | } |
367 | ||
75e2c877 RS |
368 | drbg->state = DRBG_ERROR; |
369 | if (drbg->get_entropy != NULL) | |
aa048aef DMSP |
370 | entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
371 | drbg->min_entropylen, drbg->max_entropylen); | |
c16de9d8 DMSP |
372 | if (entropylen < drbg->min_entropylen |
373 | || entropylen > drbg->max_entropylen) { | |
75e2c877 | 374 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
375 | goto end; |
376 | } | |
377 | ||
8212d505 | 378 | if (!drbg->meth->reseed(drbg, entropy, entropylen, adin, adinlen)) |
12fb8c3d | 379 | goto end; |
a93ba405 | 380 | |
75e2c877 | 381 | drbg->state = DRBG_READY; |
a93ba405 | 382 | drbg->generate_counter = 0; |
08a65d96 | 383 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
384 | if (drbg->reseed_counter > 0) { |
385 | if (drbg->parent == NULL) | |
386 | drbg->reseed_counter++; | |
387 | else | |
388 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
389 | } | |
12fb8c3d RS |
390 | |
391 | end: | |
75e2c877 | 392 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 393 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 394 | if (drbg->state == DRBG_READY) |
12fb8c3d | 395 | return 1; |
12fb8c3d RS |
396 | return 0; |
397 | } | |
398 | ||
c16de9d8 DMSP |
399 | /* |
400 | * Restart |drbg|, using the specified entropy or additional input | |
401 | * | |
402 | * Tries its best to get the drbg instantiated by all means, | |
403 | * regardless of its current state. | |
404 | * | |
405 | * Optionally, a |buffer| of |len| random bytes can be passed, | |
406 | * which is assumed to contain at least |entropy| bits of entropy. | |
407 | * | |
408 | * If |entropy| > 0, the buffer content is used as entropy input. | |
409 | * | |
410 | * If |entropy| == 0, the buffer content is used as additional input | |
411 | * | |
412 | * Returns 1 on success, 0 on failure. | |
413 | * | |
414 | * This function is used internally only. | |
415 | */ | |
416 | int rand_drbg_restart(RAND_DRBG *drbg, | |
417 | const unsigned char *buffer, size_t len, size_t entropy) | |
418 | { | |
419 | int reseeded = 0; | |
420 | const unsigned char *adin = NULL; | |
421 | size_t adinlen = 0; | |
422 | ||
423 | if (drbg->pool != NULL) { | |
424 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
425 | RAND_POOL_free(drbg->pool); | |
426 | drbg->pool = NULL; | |
427 | } | |
428 | ||
429 | if (buffer != NULL) { | |
430 | if (entropy > 0) { | |
431 | if (drbg->max_entropylen < len) { | |
432 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
433 | RAND_R_ENTROPY_INPUT_TOO_LONG); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | if (entropy > 8 * len) { | |
438 | RANDerr(RAND_F_RAND_DRBG_RESTART, RAND_R_ENTROPY_OUT_OF_RANGE); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /* will be picked up by the rand_drbg_get_entropy() callback */ | |
443 | drbg->pool = RAND_POOL_new(entropy, len, len); | |
444 | if (drbg->pool == NULL) | |
445 | return 0; | |
446 | ||
447 | RAND_POOL_add(drbg->pool, buffer, len, entropy); | |
448 | } else { | |
449 | if (drbg->max_adinlen < len) { | |
450 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
451 | RAND_R_ADDITIONAL_INPUT_TOO_LONG); | |
452 | return 0; | |
453 | } | |
454 | adin = buffer; | |
455 | adinlen = len; | |
456 | } | |
457 | } | |
458 | ||
459 | /* repair error state */ | |
efb8128a | 460 | if (drbg->state == DRBG_ERROR) |
c16de9d8 DMSP |
461 | RAND_DRBG_uninstantiate(drbg); |
462 | ||
463 | /* repair uninitialized state */ | |
464 | if (drbg->state == DRBG_UNINITIALISED) { | |
a93ba405 DMSP |
465 | /* reinstantiate drbg */ |
466 | RAND_DRBG_instantiate(drbg, | |
467 | (const unsigned char *) ossl_pers_string, | |
468 | sizeof(ossl_pers_string) - 1); | |
c16de9d8 DMSP |
469 | /* already reseeded. prevent second reseeding below */ |
470 | reseeded = (drbg->state == DRBG_READY); | |
471 | } | |
472 | ||
473 | /* refresh current state if entropy or additional input has been provided */ | |
474 | if (drbg->state == DRBG_READY) { | |
475 | if (adin != NULL) { | |
476 | /* | |
477 | * mix in additional input without reseeding | |
478 | * | |
479 | * Similar to RAND_DRBG_reseed(), but the provided additional | |
480 | * data |adin| is mixed into the current state without pulling | |
481 | * entropy from the trusted entropy source using get_entropy(). | |
482 | * This is not a reseeding in the strict sense of NIST SP 800-90A. | |
483 | */ | |
8212d505 | 484 | drbg->meth->reseed(drbg, adin, adinlen, NULL, 0); |
c16de9d8 DMSP |
485 | } else if (reseeded == 0) { |
486 | /* do a full reseeding if it has not been done yet above */ | |
487 | RAND_DRBG_reseed(drbg, NULL, 0); | |
488 | } | |
489 | } | |
490 | ||
491 | /* check whether a given entropy pool was cleared properly during reseed */ | |
492 | if (drbg->pool != NULL) { | |
493 | drbg->state = DRBG_ERROR; | |
494 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
495 | RAND_POOL_free(drbg->pool); | |
496 | drbg->pool = NULL; | |
497 | return 0; | |
498 | } | |
499 | ||
500 | return drbg->state == DRBG_READY; | |
501 | } | |
502 | ||
12fb8c3d RS |
503 | /* |
504 | * Generate |outlen| bytes into the buffer at |out|. Reseed if we need | |
505 | * to or if |prediction_resistance| is set. Additional input can be | |
506 | * sent in |adin| and |adinlen|. | |
c16de9d8 | 507 | * |
2139145b BK |
508 | * Requires that drbg->lock is already locked for write, if non-null. |
509 | * | |
c16de9d8 DMSP |
510 | * Returns 1 on success, 0 on failure. |
511 | * | |
12fb8c3d | 512 | */ |
75e2c877 | 513 | int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen, |
12fb8c3d RS |
514 | int prediction_resistance, |
515 | const unsigned char *adin, size_t adinlen) | |
516 | { | |
e0b625f9 DMSP |
517 | int reseed_required = 0; |
518 | ||
c16de9d8 DMSP |
519 | if (drbg->state != DRBG_READY) { |
520 | /* try to recover from previous errors */ | |
521 | rand_drbg_restart(drbg, NULL, 0, 0); | |
522 | ||
523 | if (drbg->state == DRBG_ERROR) { | |
524 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_IN_ERROR_STATE); | |
525 | return 0; | |
526 | } | |
527 | if (drbg->state == DRBG_UNINITIALISED) { | |
528 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_NOT_INSTANTIATED); | |
529 | return 0; | |
530 | } | |
12fb8c3d | 531 | } |
c16de9d8 | 532 | |
75e2c877 RS |
533 | if (outlen > drbg->max_request) { |
534 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_REQUEST_TOO_LARGE_FOR_DRBG); | |
535 | return 0; | |
536 | } | |
aa048aef | 537 | if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
538 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
539 | return 0; | |
12fb8c3d RS |
540 | } |
541 | ||
a35f607c RS |
542 | if (drbg->fork_count != rand_fork_count) { |
543 | drbg->fork_count = rand_fork_count; | |
e0b625f9 | 544 | reseed_required = 1; |
a35f607c RS |
545 | } |
546 | ||
a93ba405 DMSP |
547 | if (drbg->reseed_interval > 0) { |
548 | if (drbg->generate_counter >= drbg->reseed_interval) | |
549 | reseed_required = 1; | |
550 | } | |
08a65d96 DMSP |
551 | if (drbg->reseed_time_interval > 0) { |
552 | time_t now = time(NULL); | |
553 | if (now < drbg->reseed_time | |
554 | || now - drbg->reseed_time >= drbg->reseed_time_interval) | |
555 | reseed_required = 1; | |
556 | } | |
a93ba405 DMSP |
557 | if (drbg->reseed_counter > 0 && drbg->parent != NULL) { |
558 | if (drbg->reseed_counter != drbg->parent->reseed_counter) | |
559 | reseed_required = 1; | |
560 | } | |
12fb8c3d | 561 | |
e0b625f9 | 562 | if (reseed_required || prediction_resistance) { |
75e2c877 RS |
563 | if (!RAND_DRBG_reseed(drbg, adin, adinlen)) { |
564 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_RESEED_ERROR); | |
565 | return 0; | |
12fb8c3d RS |
566 | } |
567 | adin = NULL; | |
568 | adinlen = 0; | |
569 | } | |
570 | ||
8212d505 | 571 | if (!drbg->meth->generate(drbg, out, outlen, adin, adinlen)) { |
75e2c877 RS |
572 | drbg->state = DRBG_ERROR; |
573 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_GENERATE_ERROR); | |
574 | return 0; | |
12fb8c3d | 575 | } |
75e2c877 | 576 | |
a93ba405 | 577 | drbg->generate_counter++; |
e0b625f9 | 578 | |
12fb8c3d | 579 | return 1; |
12fb8c3d RS |
580 | } |
581 | ||
20928ff6 KR |
582 | /* |
583 | * Generates |outlen| random bytes and stores them in |out|. It will | |
584 | * using the given |drbg| to generate the bytes. | |
585 | * | |
586 | * Requires that drbg->lock is already locked for write, if non-null. | |
587 | * | |
588 | * Returns 1 on success 0 on failure. | |
589 | */ | |
590 | int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen) | |
591 | { | |
592 | unsigned char *additional = NULL; | |
593 | size_t additional_len; | |
1648338b | 594 | size_t chunk; |
20928ff6 KR |
595 | size_t ret; |
596 | ||
597 | additional_len = rand_drbg_get_additional_data(&additional, drbg->max_adinlen); | |
1648338b DMSP |
598 | |
599 | for ( ; outlen > 0; outlen -= chunk, out += chunk) { | |
600 | chunk = outlen; | |
601 | if (chunk > drbg->max_request) | |
602 | chunk = drbg->max_request; | |
603 | ret = RAND_DRBG_generate(drbg, out, chunk, 0, additional, additional_len); | |
604 | if (!ret) | |
605 | goto err; | |
606 | } | |
607 | ret = 1; | |
608 | ||
609 | err: | |
20928ff6 KR |
610 | if (additional_len != 0) |
611 | OPENSSL_secure_clear_free(additional, additional_len); | |
612 | ||
613 | return ret; | |
614 | } | |
615 | ||
12fb8c3d | 616 | /* |
c16de9d8 DMSP |
617 | * Set the RAND_DRBG callbacks for obtaining entropy and nonce. |
618 | * | |
619 | * In the following, the signature and the semantics of the | |
620 | * get_entropy() and cleanup_entropy() callbacks are explained. | |
621 | * | |
622 | * GET_ENTROPY | |
623 | * | |
624 | * size_t get_entropy(RAND_DRBG *ctx, | |
625 | * unsigned char **pout, | |
626 | * int entropy, | |
627 | * size_t min_len, size_t max_len); | |
628 | * | |
629 | * This is a request to allocate and fill a buffer of size | |
630 | * |min_len| <= size <= |max_len| (in bytes) which contains | |
631 | * at least |entropy| bits of randomness. The buffer's address is | |
632 | * to be returned in |*pout| and the number of collected | |
633 | * randomness bytes (which may be less than the allocated size | |
634 | * of the buffer) as return value. | |
635 | * | |
636 | * If the callback fails to acquire at least |entropy| bits of | |
637 | * randomness, it shall return a buffer length of 0. | |
638 | * | |
639 | * CLEANUP_ENTROPY | |
640 | * | |
641 | * void cleanup_entropy(RAND_DRBG *ctx, | |
642 | * unsigned char *out, size_t outlen); | |
643 | * | |
644 | * A request to clear and free the buffer allocated by get_entropy(). | |
645 | * The values |out| and |outlen| are expected to be the random buffer's | |
646 | * address and length, as returned by the get_entropy() callback. | |
647 | * | |
648 | * GET_NONCE, CLEANUP_NONCE | |
649 | * | |
650 | * Signature and semantics of the get_nonce() and cleanup_nonce() | |
651 | * callbacks are analogous to get_entropy() and cleanup_entropy(). | |
652 | * Currently, the nonce is used only for the known answer tests. | |
12fb8c3d | 653 | */ |
75e2c877 | 654 | int RAND_DRBG_set_callbacks(RAND_DRBG *drbg, |
c16de9d8 DMSP |
655 | RAND_DRBG_get_entropy_fn get_entropy, |
656 | RAND_DRBG_cleanup_entropy_fn cleanup_entropy, | |
657 | RAND_DRBG_get_nonce_fn get_nonce, | |
658 | RAND_DRBG_cleanup_nonce_fn cleanup_nonce) | |
12fb8c3d | 659 | { |
75e2c877 | 660 | if (drbg->state != DRBG_UNINITIALISED) |
12fb8c3d | 661 | return 0; |
c16de9d8 DMSP |
662 | drbg->get_entropy = get_entropy; |
663 | drbg->cleanup_entropy = cleanup_entropy; | |
664 | drbg->get_nonce = get_nonce; | |
665 | drbg->cleanup_nonce = cleanup_nonce; | |
12fb8c3d RS |
666 | return 1; |
667 | } | |
668 | ||
669 | /* | |
75e2c877 | 670 | * Set the reseed interval. |
a93ba405 DMSP |
671 | * |
672 | * The drbg will reseed automatically whenever the number of generate | |
673 | * requests exceeds the given reseed interval. If the reseed interval | |
08a65d96 | 674 | * is 0, then this feature is disabled. |
a93ba405 DMSP |
675 | * |
676 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 677 | */ |
a93ba405 | 678 | int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval) |
12fb8c3d | 679 | { |
a93ba405 | 680 | if (interval > MAX_RESEED_INTERVAL) |
4c75ee85 | 681 | return 0; |
75e2c877 | 682 | drbg->reseed_interval = interval; |
4c75ee85 | 683 | return 1; |
12fb8c3d RS |
684 | } |
685 | ||
08a65d96 DMSP |
686 | /* |
687 | * Set the reseed time interval. | |
688 | * | |
689 | * The drbg will reseed automatically whenever the time elapsed since | |
690 | * the last reseeding exceeds the given reseed time interval. For safety, | |
691 | * a reseeding will also occur if the clock has been reset to a smaller | |
692 | * value. | |
693 | * | |
694 | * Returns 1 on success, 0 on failure. | |
695 | */ | |
696 | int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval) | |
697 | { | |
698 | if (interval > MAX_RESEED_TIME_INTERVAL) | |
699 | return 0; | |
700 | drbg->reseed_time_interval = interval; | |
701 | return 1; | |
702 | } | |
703 | ||
3ce1c27b DMSP |
704 | |
705 | /* | |
706 | * Locks the given drbg. Locking a drbg which does not have locking | |
707 | * enabled is considered a successful no-op. | |
708 | * | |
709 | * Returns 1 on success, 0 on failure. | |
710 | */ | |
812b1537 | 711 | int rand_drbg_lock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
712 | { |
713 | if (drbg->lock != NULL) | |
714 | return CRYPTO_THREAD_write_lock(drbg->lock); | |
715 | ||
716 | return 1; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Unlocks the given drbg. Unlocking a drbg which does not have locking | |
721 | * enabled is considered a successful no-op. | |
722 | * | |
723 | * Returns 1 on success, 0 on failure. | |
724 | */ | |
812b1537 | 725 | int rand_drbg_unlock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
726 | { |
727 | if (drbg->lock != NULL) | |
728 | return CRYPTO_THREAD_unlock(drbg->lock); | |
729 | ||
730 | return 1; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Enables locking for the given drbg | |
735 | * | |
736 | * Locking can only be enabled if the random generator | |
737 | * is in the uninitialized state. | |
738 | * | |
739 | * Returns 1 on success, 0 on failure. | |
740 | */ | |
812b1537 | 741 | int rand_drbg_enable_locking(RAND_DRBG *drbg) |
3ce1c27b DMSP |
742 | { |
743 | if (drbg->state != DRBG_UNINITIALISED) { | |
744 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
745 | RAND_R_DRBG_ALREADY_INITIALIZED); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | if (drbg->lock == NULL) { | |
4f9dabbf | 750 | if (drbg->parent != NULL && drbg->parent->lock == NULL) { |
3ce1c27b DMSP |
751 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, |
752 | RAND_R_PARENT_LOCKING_NOT_ENABLED); | |
753 | return 0; | |
754 | } | |
755 | ||
756 | drbg->lock = CRYPTO_THREAD_lock_new(); | |
757 | if (drbg->lock == NULL) { | |
758 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
759 | RAND_R_FAILED_TO_CREATE_LOCK); | |
760 | return 0; | |
761 | } | |
762 | } | |
763 | ||
764 | return 1; | |
765 | } | |
766 | ||
12fb8c3d RS |
767 | /* |
768 | * Get and set the EXDATA | |
769 | */ | |
75e2c877 RS |
770 | int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg) |
771 | { | |
772 | return CRYPTO_set_ex_data(&drbg->ex_data, idx, arg); | |
773 | } | |
774 | ||
775 | void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx) | |
776 | { | |
777 | return CRYPTO_get_ex_data(&drbg->ex_data, idx); | |
778 | } | |
779 | ||
780 | ||
781 | /* | |
782 | * The following functions provide a RAND_METHOD that works on the | |
783 | * global DRBG. They lock. | |
784 | */ | |
785 | ||
0b14a5b7 | 786 | /* |
933033b6 DMSP |
787 | * Allocates a new global DRBG on the secure heap (if enabled) and |
788 | * initializes it with default settings. | |
a93ba405 DMSP |
789 | * |
790 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
0b14a5b7 | 791 | */ |
63ab5ea1 | 792 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent) |
0b14a5b7 | 793 | { |
933033b6 | 794 | RAND_DRBG *drbg; |
0b14a5b7 | 795 | |
8164d91d | 796 | drbg = RAND_DRBG_secure_new(RAND_DRBG_NID, 0, parent); |
933033b6 DMSP |
797 | if (drbg == NULL) |
798 | return NULL; | |
799 | ||
812b1537 | 800 | if (rand_drbg_enable_locking(drbg) == 0) |
933033b6 | 801 | goto err; |
a93ba405 | 802 | |
08a65d96 | 803 | if (parent == NULL) { |
a93ba405 | 804 | drbg->reseed_interval = MASTER_RESEED_INTERVAL; |
08a65d96 DMSP |
805 | drbg->reseed_time_interval = MASTER_RESEED_TIME_INTERVAL; |
806 | } else { | |
a93ba405 | 807 | drbg->reseed_interval = SLAVE_RESEED_INTERVAL; |
08a65d96 | 808 | drbg->reseed_time_interval = SLAVE_RESEED_TIME_INTERVAL; |
a93ba405 DMSP |
809 | } |
810 | ||
811 | /* enable seed propagation */ | |
812 | drbg->reseed_counter = 1; | |
813 | ||
c16de9d8 DMSP |
814 | /* |
815 | * Ignore instantiation error so support just-in-time instantiation. | |
816 | * | |
817 | * The state of the drbg will be checked in RAND_DRBG_generate() and | |
818 | * an automatic recovery is attempted. | |
819 | */ | |
820 | RAND_DRBG_instantiate(drbg, | |
821 | (const unsigned char *) ossl_pers_string, | |
822 | sizeof(ossl_pers_string) - 1); | |
933033b6 DMSP |
823 | return drbg; |
824 | ||
825 | err: | |
4f9dabbf | 826 | RAND_DRBG_free(drbg); |
933033b6 | 827 | return NULL; |
0b14a5b7 KR |
828 | } |
829 | ||
830 | /* | |
831 | * Initialize the global DRBGs on first use. | |
832 | * Returns 1 on success, 0 on failure. | |
833 | */ | |
c16de9d8 | 834 | DEFINE_RUN_ONCE_STATIC(do_rand_drbg_init) |
0b14a5b7 | 835 | { |
39571fca DMSP |
836 | /* |
837 | * ensure that libcrypto is initialized, otherwise the | |
838 | * DRBG locks are not cleaned up properly | |
839 | */ | |
840 | if (!OPENSSL_init_crypto(0, NULL)) | |
841 | return 0; | |
842 | ||
63ab5ea1 BK |
843 | drbg_master = drbg_setup(NULL); |
844 | drbg_public = drbg_setup(drbg_master); | |
845 | drbg_private = drbg_setup(drbg_master); | |
0b14a5b7 | 846 | |
933033b6 DMSP |
847 | if (drbg_master == NULL || drbg_public == NULL || drbg_private == NULL) |
848 | return 0; | |
0b14a5b7 | 849 | |
933033b6 | 850 | return 1; |
0b14a5b7 KR |
851 | } |
852 | ||
0b14a5b7 | 853 | /* Clean up the global DRBGs before exit */ |
c16de9d8 | 854 | void rand_drbg_cleanup_int(void) |
0b14a5b7 | 855 | { |
4f9dabbf DMSP |
856 | RAND_DRBG_free(drbg_private); |
857 | RAND_DRBG_free(drbg_public); | |
858 | RAND_DRBG_free(drbg_master); | |
933033b6 DMSP |
859 | |
860 | drbg_private = drbg_public = drbg_master = NULL; | |
0b14a5b7 KR |
861 | } |
862 | ||
c16de9d8 | 863 | /* Implements the default OpenSSL RAND_bytes() method */ |
75e2c877 RS |
864 | static int drbg_bytes(unsigned char *out, int count) |
865 | { | |
f61f62ea | 866 | int ret; |
a93ba405 | 867 | RAND_DRBG *drbg = RAND_DRBG_get0_public(); |
75e2c877 | 868 | |
0b14a5b7 KR |
869 | if (drbg == NULL) |
870 | return 0; | |
871 | ||
812b1537 | 872 | rand_drbg_lock(drbg); |
f61f62ea | 873 | ret = RAND_DRBG_bytes(drbg, out, count); |
812b1537 | 874 | rand_drbg_unlock(drbg); |
f61f62ea | 875 | |
75e2c877 RS |
876 | return ret; |
877 | } | |
878 | ||
c16de9d8 | 879 | /* Implements the default OpenSSL RAND_add() method */ |
75e2c877 RS |
880 | static int drbg_add(const void *buf, int num, double randomness) |
881 | { | |
c16de9d8 | 882 | int ret = 0; |
a93ba405 | 883 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
75e2c877 | 884 | |
c16de9d8 DMSP |
885 | if (drbg == NULL) |
886 | return 0; | |
75e2c877 | 887 | |
c16de9d8 DMSP |
888 | if (num < 0 || randomness < 0.0) |
889 | return 0; | |
75e2c877 | 890 | |
c16de9d8 DMSP |
891 | if (randomness > (double)drbg->max_entropylen) { |
892 | /* | |
893 | * The purpose of this check is to bound |randomness| by a | |
894 | * relatively small value in order to prevent an integer | |
895 | * overflow when multiplying by 8 in the rand_drbg_restart() | |
896 | * call below. | |
897 | */ | |
898 | return 0; | |
75e2c877 RS |
899 | } |
900 | ||
812b1537 | 901 | rand_drbg_lock(drbg); |
c16de9d8 DMSP |
902 | ret = rand_drbg_restart(drbg, buf, |
903 | (size_t)(unsigned int)num, | |
904 | (size_t)(8*randomness)); | |
812b1537 | 905 | rand_drbg_unlock(drbg); |
c16de9d8 DMSP |
906 | |
907 | return ret; | |
75e2c877 RS |
908 | } |
909 | ||
c16de9d8 | 910 | /* Implements the default OpenSSL RAND_seed() method */ |
75e2c877 RS |
911 | static int drbg_seed(const void *buf, int num) |
912 | { | |
913 | return drbg_add(buf, num, num); | |
914 | } | |
915 | ||
c16de9d8 | 916 | /* Implements the default OpenSSL RAND_status() method */ |
75e2c877 | 917 | static int drbg_status(void) |
12fb8c3d | 918 | { |
75e2c877 | 919 | int ret; |
a93ba405 | 920 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
0b14a5b7 KR |
921 | |
922 | if (drbg == NULL) | |
923 | return 0; | |
75e2c877 | 924 | |
812b1537 | 925 | rand_drbg_lock(drbg); |
0b14a5b7 | 926 | ret = drbg->state == DRBG_READY ? 1 : 0; |
812b1537 | 927 | rand_drbg_unlock(drbg); |
75e2c877 | 928 | return ret; |
12fb8c3d RS |
929 | } |
930 | ||
0b14a5b7 | 931 | /* |
a93ba405 DMSP |
932 | * Get the master DRBG. |
933 | * Returns pointer to the DRBG on success, NULL on failure. | |
934 | * | |
935 | */ | |
936 | RAND_DRBG *RAND_DRBG_get0_master(void) | |
937 | { | |
938 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) | |
939 | return NULL; | |
940 | ||
933033b6 | 941 | return drbg_master; |
a93ba405 DMSP |
942 | } |
943 | ||
944 | /* | |
945 | * Get the public DRBG. | |
0b14a5b7 KR |
946 | * Returns pointer to the DRBG on success, NULL on failure. |
947 | */ | |
a93ba405 | 948 | RAND_DRBG *RAND_DRBG_get0_public(void) |
0b14a5b7 | 949 | { |
c16de9d8 | 950 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
951 | return NULL; |
952 | ||
933033b6 | 953 | return drbg_public; |
0b14a5b7 KR |
954 | } |
955 | ||
956 | /* | |
a93ba405 | 957 | * Get the private DRBG. |
0b14a5b7 KR |
958 | * Returns pointer to the DRBG on success, NULL on failure. |
959 | */ | |
a93ba405 | 960 | RAND_DRBG *RAND_DRBG_get0_private(void) |
0b14a5b7 | 961 | { |
c16de9d8 | 962 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
963 | return NULL; |
964 | ||
933033b6 | 965 | return drbg_private; |
0b14a5b7 KR |
966 | } |
967 | ||
75e2c877 RS |
968 | RAND_METHOD rand_meth = { |
969 | drbg_seed, | |
970 | drbg_bytes, | |
ddc6a5c8 | 971 | NULL, |
75e2c877 RS |
972 | drbg_add, |
973 | drbg_bytes, | |
974 | drbg_status | |
975 | }; | |
976 | ||
977 | RAND_METHOD *RAND_OpenSSL(void) | |
12fb8c3d | 978 | { |
75e2c877 | 979 | return &rand_meth; |
12fb8c3d | 980 | } |