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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" | |
7caf122e | 17 | #include "internal/cryptlib_int.h" |
12fb8c3d RS |
18 | |
19 | /* | |
a73d990e DMSP |
20 | * Support framework for NIST SP 800-90A DRBG |
21 | * | |
22 | * See manual page RAND_DRBG(7) for a general overview. | |
75e2c877 | 23 | * |
12fb8c3d RS |
24 | * The OpenSSL model is to have new and free functions, and that new |
25 | * does all initialization. That is not the NIST model, which has | |
26 | * instantiation and un-instantiate, and re-use within a new/free | |
27 | * lifecycle. (No doubt this comes from the desire to support hardware | |
28 | * DRBG, where allocation of resources on something like an HSM is | |
29 | * a much bigger deal than just re-setting an allocated resource.) | |
12fb8c3d RS |
30 | */ |
31 | ||
a93ba405 | 32 | /* |
a73d990e | 33 | * The three shared DRBG instances |
a93ba405 | 34 | * |
a73d990e DMSP |
35 | * There are three shared DRBG instances: <master>, <public>, and <private>. |
36 | */ | |
37 | ||
38 | /* | |
39 | * The <master> DRBG | |
a93ba405 DMSP |
40 | * |
41 | * Not used directly by the application, only for reseeding the two other | |
42 | * DRBGs. It reseeds itself by pulling either randomness from os entropy | |
a73d990e | 43 | * sources or by consuming randomness which was added by RAND_add(). |
a93ba405 | 44 | * |
a73d990e DMSP |
45 | * The <master> DRBG is a global instance which is accessed concurrently by |
46 | * all threads. The necessary locking is managed automatically by its child | |
47 | * DRBG instances during reseeding. | |
48 | */ | |
49 | static RAND_DRBG *master_drbg; | |
50 | /* | |
51 | * The <public> DRBG | |
a93ba405 | 52 | * |
a73d990e | 53 | * Used by default for generating random bytes using RAND_bytes(). |
3ce1c27b | 54 | * |
a73d990e DMSP |
55 | * The <public> DRBG is thread-local, i.e., there is one instance per thread. |
56 | */ | |
57 | static CRYPTO_THREAD_LOCAL public_drbg; | |
58 | /* | |
59 | * The <private> DRBG | |
3ce1c27b | 60 | * |
a73d990e | 61 | * Used by default for generating private keys using RAND_priv_bytes() |
812b1537 | 62 | * |
a73d990e | 63 | * The <private> DRBG is thread-local, i.e., there is one instance per thread. |
a93ba405 | 64 | */ |
a73d990e DMSP |
65 | static CRYPTO_THREAD_LOCAL private_drbg; |
66 | ||
a93ba405 DMSP |
67 | |
68 | ||
69 | /* NIST SP 800-90A DRBG recommends the use of a personalization string. */ | |
70 | static const char ossl_pers_string[] = "OpenSSL NIST SP 800-90A DRBG"; | |
71 | ||
c16de9d8 DMSP |
72 | static CRYPTO_ONCE rand_drbg_init = CRYPTO_ONCE_STATIC_INIT; |
73 | ||
31393fd9 DMSP |
74 | |
75 | ||
76 | static int rand_drbg_type = RAND_DRBG_TYPE; | |
77 | static unsigned int rand_drbg_flags = RAND_DRBG_FLAGS; | |
78 | ||
4917e911 DMSP |
79 | static unsigned int master_reseed_interval = MASTER_RESEED_INTERVAL; |
80 | static unsigned int slave_reseed_interval = SLAVE_RESEED_INTERVAL; | |
81 | ||
82 | static time_t master_reseed_time_interval = MASTER_RESEED_TIME_INTERVAL; | |
83 | static time_t slave_reseed_time_interval = SLAVE_RESEED_TIME_INTERVAL; | |
84 | ||
63ab5ea1 | 85 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent); |
4f9dabbf DMSP |
86 | |
87 | static RAND_DRBG *rand_drbg_new(int secure, | |
88 | int type, | |
89 | unsigned int flags, | |
90 | RAND_DRBG *parent); | |
0b14a5b7 | 91 | |
12fb8c3d | 92 | /* |
31393fd9 DMSP |
93 | * Set/initialize |drbg| to be of type |type|, with optional |flags|. |
94 | * | |
95 | * If |type| and |flags| are zero, use the defaults | |
efb8128a DMSP |
96 | * |
97 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 98 | */ |
31393fd9 | 99 | int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags) |
12fb8c3d RS |
100 | { |
101 | int ret = 1; | |
102 | ||
31393fd9 DMSP |
103 | if (type == 0 && flags == 0) { |
104 | type = rand_drbg_type; | |
105 | flags = rand_drbg_flags; | |
106 | } | |
107 | ||
75e2c877 RS |
108 | drbg->state = DRBG_UNINITIALISED; |
109 | drbg->flags = flags; | |
31393fd9 | 110 | drbg->type = type; |
12fb8c3d | 111 | |
31393fd9 | 112 | switch (type) { |
12fb8c3d RS |
113 | default: |
114 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE); | |
efb8128a | 115 | return 0; |
12fb8c3d RS |
116 | case 0: |
117 | /* Uninitialized; that's okay. */ | |
118 | return 1; | |
119 | case NID_aes_128_ctr: | |
120 | case NID_aes_192_ctr: | |
121 | case NID_aes_256_ctr: | |
8212d505 | 122 | ret = drbg_ctr_init(drbg); |
12fb8c3d RS |
123 | break; |
124 | } | |
125 | ||
efb8128a | 126 | if (ret == 0) |
12fb8c3d RS |
127 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_ERROR_INITIALISING_DRBG); |
128 | return ret; | |
129 | } | |
130 | ||
31393fd9 DMSP |
131 | /* |
132 | * Set/initialize default |type| and |flag| for new drbg instances. | |
133 | * | |
134 | * Returns 1 on success, 0 on failure. | |
135 | */ | |
136 | int RAND_DRBG_set_defaults(int type, unsigned int flags) | |
137 | { | |
138 | int ret = 1; | |
139 | ||
140 | switch (type) { | |
141 | default: | |
142 | RANDerr(RAND_F_RAND_DRBG_SET_DEFAULTS, RAND_R_UNSUPPORTED_DRBG_TYPE); | |
143 | return 0; | |
144 | case NID_aes_128_ctr: | |
145 | case NID_aes_192_ctr: | |
146 | case NID_aes_256_ctr: | |
147 | break; | |
148 | } | |
149 | ||
150 | if ((flags & ~RAND_DRBG_USED_FLAGS) != 0) { | |
151 | RANDerr(RAND_F_RAND_DRBG_SET_DEFAULTS, RAND_R_UNSUPPORTED_DRBG_FLAGS); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | rand_drbg_type = type; | |
156 | rand_drbg_flags = flags; | |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
161 | ||
12fb8c3d | 162 | /* |
4f9dabbf DMSP |
163 | * Allocate memory and initialize a new DRBG. The DRBG is allocated on |
164 | * the secure heap if |secure| is nonzero and the secure heap is enabled. | |
165 | * The |parent|, if not NULL, will be used as random source for reseeding. | |
a93ba405 DMSP |
166 | * |
167 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
12fb8c3d | 168 | */ |
4f9dabbf DMSP |
169 | static RAND_DRBG *rand_drbg_new(int secure, |
170 | int type, | |
171 | unsigned int flags, | |
172 | RAND_DRBG *parent) | |
12fb8c3d | 173 | { |
4f9dabbf DMSP |
174 | RAND_DRBG *drbg = secure ? |
175 | OPENSSL_secure_zalloc(sizeof(*drbg)) : OPENSSL_zalloc(sizeof(*drbg)); | |
12fb8c3d | 176 | |
9d951a78 | 177 | if (drbg == NULL) { |
12fb8c3d | 178 | RANDerr(RAND_F_RAND_DRBG_NEW, ERR_R_MALLOC_FAILURE); |
f96ff4e9 | 179 | return NULL; |
12fb8c3d | 180 | } |
4f9dabbf DMSP |
181 | |
182 | drbg->secure = secure && CRYPTO_secure_allocated(drbg); | |
a35f607c | 183 | drbg->fork_count = rand_fork_count; |
75e2c877 | 184 | drbg->parent = parent; |
4917e911 DMSP |
185 | |
186 | if (parent == NULL) { | |
187 | drbg->reseed_interval = master_reseed_interval; | |
188 | drbg->reseed_time_interval = master_reseed_time_interval; | |
189 | } else { | |
190 | drbg->reseed_interval = slave_reseed_interval; | |
191 | drbg->reseed_time_interval = slave_reseed_time_interval; | |
192 | } | |
193 | ||
efb8128a | 194 | if (RAND_DRBG_set(drbg, type, flags) == 0) |
75e2c877 RS |
195 | goto err; |
196 | ||
7caf122e KR |
197 | if (parent != NULL) { |
198 | rand_drbg_lock(parent); | |
199 | if (drbg->strength > parent->strength) { | |
200 | /* | |
201 | * We currently don't support the algorithm from NIST SP 800-90C | |
202 | * 10.1.2 to use a weaker DRBG as source | |
203 | */ | |
204 | rand_drbg_unlock(parent); | |
205 | RANDerr(RAND_F_RAND_DRBG_NEW, RAND_R_PARENT_STRENGTH_TOO_WEAK); | |
206 | goto err; | |
207 | } | |
208 | rand_drbg_unlock(parent); | |
35503b7c KR |
209 | } |
210 | ||
a93ba405 DMSP |
211 | if (!RAND_DRBG_set_callbacks(drbg, rand_drbg_get_entropy, |
212 | rand_drbg_cleanup_entropy, | |
213 | NULL, NULL)) | |
214 | goto err; | |
75e2c877 RS |
215 | |
216 | return drbg; | |
217 | ||
218 | err: | |
4f9dabbf DMSP |
219 | if (drbg->secure) |
220 | OPENSSL_secure_free(drbg); | |
221 | else | |
222 | OPENSSL_free(drbg); | |
223 | ||
75e2c877 | 224 | return NULL; |
12fb8c3d RS |
225 | } |
226 | ||
4f9dabbf DMSP |
227 | RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) |
228 | { | |
229 | return rand_drbg_new(0, type, flags, parent); | |
230 | } | |
231 | ||
232 | RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent) | |
233 | { | |
234 | return rand_drbg_new(1, type, flags, parent); | |
235 | } | |
236 | ||
12fb8c3d | 237 | /* |
75e2c877 | 238 | * Uninstantiate |drbg| and free all memory. |
12fb8c3d | 239 | */ |
75e2c877 | 240 | void RAND_DRBG_free(RAND_DRBG *drbg) |
12fb8c3d | 241 | { |
c16de9d8 | 242 | if (drbg == NULL) |
12fb8c3d RS |
243 | return; |
244 | ||
8212d505 DMSP |
245 | if (drbg->meth != NULL) |
246 | drbg->meth->uninstantiate(drbg); | |
4f9dabbf | 247 | CRYPTO_THREAD_lock_free(drbg->lock); |
75e2c877 | 248 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data); |
4f9dabbf DMSP |
249 | |
250 | if (drbg->secure) | |
251 | OPENSSL_secure_clear_free(drbg, sizeof(*drbg)); | |
252 | else | |
253 | OPENSSL_clear_free(drbg, sizeof(*drbg)); | |
12fb8c3d RS |
254 | } |
255 | ||
256 | /* | |
75e2c877 | 257 | * Instantiate |drbg|, after it has been initialized. Use |pers| and |
12fb8c3d | 258 | * |perslen| as prediction-resistance input. |
2139145b BK |
259 | * |
260 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
261 | * |
262 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 263 | */ |
75e2c877 | 264 | int RAND_DRBG_instantiate(RAND_DRBG *drbg, |
12fb8c3d RS |
265 | const unsigned char *pers, size_t perslen) |
266 | { | |
12fb8c3d | 267 | unsigned char *nonce = NULL, *entropy = NULL; |
aa048aef | 268 | size_t noncelen = 0, entropylen = 0; |
2a70d65b KR |
269 | size_t min_entropy = drbg->strength; |
270 | size_t min_entropylen = drbg->min_entropylen; | |
271 | size_t max_entropylen = drbg->max_entropylen; | |
12fb8c3d | 272 | |
aa048aef | 273 | if (perslen > drbg->max_perslen) { |
75e2c877 RS |
274 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
275 | RAND_R_PERSONALISATION_STRING_TOO_LONG); | |
12fb8c3d RS |
276 | goto end; |
277 | } | |
8212d505 DMSP |
278 | |
279 | if (drbg->meth == NULL) | |
280 | { | |
281 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
282 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
283 | goto end; | |
284 | } | |
285 | ||
75e2c877 RS |
286 | if (drbg->state != DRBG_UNINITIALISED) { |
287 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
288 | drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE | |
289 | : RAND_R_ALREADY_INSTANTIATED); | |
12fb8c3d RS |
290 | goto end; |
291 | } | |
292 | ||
75e2c877 | 293 | drbg->state = DRBG_ERROR; |
2a70d65b KR |
294 | |
295 | /* | |
296 | * NIST SP800-90Ar1 section 9.1 says you can combine getting the entropy | |
297 | * and nonce in 1 call by increasing the entropy with 50% and increasing | |
298 | * the minimum length to accomadate the length of the nonce. | |
299 | * We do this in case a nonce is require and get_nonce is NULL. | |
300 | */ | |
301 | if (drbg->min_noncelen > 0 && drbg->get_nonce == NULL) { | |
302 | min_entropy += drbg->strength / 2; | |
303 | min_entropylen += drbg->min_noncelen; | |
304 | max_entropylen += drbg->max_noncelen; | |
305 | } | |
306 | ||
75e2c877 | 307 | if (drbg->get_entropy != NULL) |
2a70d65b KR |
308 | entropylen = drbg->get_entropy(drbg, &entropy, min_entropy, |
309 | min_entropylen, max_entropylen, 0); | |
310 | if (entropylen < min_entropylen | |
311 | || entropylen > max_entropylen) { | |
75e2c877 | 312 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
313 | goto end; |
314 | } | |
315 | ||
2a70d65b | 316 | if (drbg->min_noncelen > 0 && drbg->get_nonce != NULL) { |
75e2c877 | 317 | noncelen = drbg->get_nonce(drbg, &nonce, drbg->strength / 2, |
aa048aef DMSP |
318 | drbg->min_noncelen, drbg->max_noncelen); |
319 | if (noncelen < drbg->min_noncelen || noncelen > drbg->max_noncelen) { | |
2a70d65b | 320 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_NONCE); |
12fb8c3d RS |
321 | goto end; |
322 | } | |
323 | } | |
324 | ||
8212d505 | 325 | if (!drbg->meth->instantiate(drbg, entropy, entropylen, |
12fb8c3d | 326 | nonce, noncelen, pers, perslen)) { |
75e2c877 | 327 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_INSTANTIATING_DRBG); |
12fb8c3d RS |
328 | goto end; |
329 | } | |
330 | ||
75e2c877 | 331 | drbg->state = DRBG_READY; |
a93ba405 | 332 | drbg->generate_counter = 0; |
08a65d96 | 333 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
334 | if (drbg->reseed_counter > 0) { |
335 | if (drbg->parent == NULL) | |
336 | drbg->reseed_counter++; | |
337 | else | |
338 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
339 | } | |
12fb8c3d RS |
340 | |
341 | end: | |
75e2c877 | 342 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 343 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 344 | if (nonce != NULL && drbg->cleanup_nonce!= NULL ) |
6969a3f4 | 345 | drbg->cleanup_nonce(drbg, nonce, noncelen); |
c16de9d8 DMSP |
346 | if (drbg->pool != NULL) { |
347 | if (drbg->state == DRBG_READY) { | |
348 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
349 | RAND_R_ERROR_ENTROPY_POOL_WAS_IGNORED); | |
350 | drbg->state = DRBG_ERROR; | |
351 | } | |
6decf943 | 352 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
353 | drbg->pool = NULL; |
354 | } | |
75e2c877 | 355 | if (drbg->state == DRBG_READY) |
12fb8c3d | 356 | return 1; |
12fb8c3d RS |
357 | return 0; |
358 | } | |
359 | ||
360 | /* | |
75e2c877 | 361 | * Uninstantiate |drbg|. Must be instantiated before it can be used. |
2139145b BK |
362 | * |
363 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
364 | * |
365 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 366 | */ |
75e2c877 | 367 | int RAND_DRBG_uninstantiate(RAND_DRBG *drbg) |
12fb8c3d | 368 | { |
8212d505 DMSP |
369 | if (drbg->meth == NULL) |
370 | { | |
371 | RANDerr(RAND_F_RAND_DRBG_UNINSTANTIATE, | |
372 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
373 | return 0; | |
374 | } | |
375 | ||
efb8128a DMSP |
376 | /* Clear the entire drbg->ctr struct, then reset some important |
377 | * members of the drbg->ctr struct (e.g. keysize, df_ks) to their | |
378 | * initial values. | |
379 | */ | |
8212d505 | 380 | drbg->meth->uninstantiate(drbg); |
31393fd9 | 381 | return RAND_DRBG_set(drbg, drbg->type, drbg->flags); |
12fb8c3d RS |
382 | } |
383 | ||
384 | /* | |
c16de9d8 | 385 | * Reseed |drbg|, mixing in the specified data |
2139145b BK |
386 | * |
387 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
388 | * |
389 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 390 | */ |
75e2c877 | 391 | int RAND_DRBG_reseed(RAND_DRBG *drbg, |
eb238134 KR |
392 | const unsigned char *adin, size_t adinlen, |
393 | int prediction_resistance) | |
12fb8c3d RS |
394 | { |
395 | unsigned char *entropy = NULL; | |
aa048aef | 396 | size_t entropylen = 0; |
75e2c877 RS |
397 | |
398 | if (drbg->state == DRBG_ERROR) { | |
399 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_IN_ERROR_STATE); | |
400 | return 0; | |
401 | } | |
402 | if (drbg->state == DRBG_UNINITIALISED) { | |
403 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_NOT_INSTANTIATED); | |
404 | return 0; | |
12fb8c3d RS |
405 | } |
406 | ||
407 | if (adin == NULL) | |
408 | adinlen = 0; | |
aa048aef | 409 | else if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
410 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
411 | return 0; | |
12fb8c3d RS |
412 | } |
413 | ||
75e2c877 RS |
414 | drbg->state = DRBG_ERROR; |
415 | if (drbg->get_entropy != NULL) | |
aa048aef | 416 | entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
eb238134 KR |
417 | drbg->min_entropylen, |
418 | drbg->max_entropylen, | |
419 | prediction_resistance); | |
c16de9d8 DMSP |
420 | if (entropylen < drbg->min_entropylen |
421 | || entropylen > drbg->max_entropylen) { | |
75e2c877 | 422 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
423 | goto end; |
424 | } | |
425 | ||
8212d505 | 426 | if (!drbg->meth->reseed(drbg, entropy, entropylen, adin, adinlen)) |
12fb8c3d | 427 | goto end; |
a93ba405 | 428 | |
75e2c877 | 429 | drbg->state = DRBG_READY; |
a93ba405 | 430 | drbg->generate_counter = 0; |
08a65d96 | 431 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
432 | if (drbg->reseed_counter > 0) { |
433 | if (drbg->parent == NULL) | |
434 | drbg->reseed_counter++; | |
435 | else | |
436 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
437 | } | |
12fb8c3d RS |
438 | |
439 | end: | |
75e2c877 | 440 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 441 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 442 | if (drbg->state == DRBG_READY) |
12fb8c3d | 443 | return 1; |
12fb8c3d RS |
444 | return 0; |
445 | } | |
446 | ||
c16de9d8 DMSP |
447 | /* |
448 | * Restart |drbg|, using the specified entropy or additional input | |
449 | * | |
450 | * Tries its best to get the drbg instantiated by all means, | |
451 | * regardless of its current state. | |
452 | * | |
453 | * Optionally, a |buffer| of |len| random bytes can be passed, | |
454 | * which is assumed to contain at least |entropy| bits of entropy. | |
455 | * | |
456 | * If |entropy| > 0, the buffer content is used as entropy input. | |
457 | * | |
458 | * If |entropy| == 0, the buffer content is used as additional input | |
459 | * | |
460 | * Returns 1 on success, 0 on failure. | |
461 | * | |
462 | * This function is used internally only. | |
463 | */ | |
464 | int rand_drbg_restart(RAND_DRBG *drbg, | |
465 | const unsigned char *buffer, size_t len, size_t entropy) | |
466 | { | |
467 | int reseeded = 0; | |
468 | const unsigned char *adin = NULL; | |
469 | size_t adinlen = 0; | |
470 | ||
471 | if (drbg->pool != NULL) { | |
472 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
6decf943 | 473 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
474 | drbg->pool = NULL; |
475 | } | |
476 | ||
477 | if (buffer != NULL) { | |
478 | if (entropy > 0) { | |
479 | if (drbg->max_entropylen < len) { | |
480 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
481 | RAND_R_ENTROPY_INPUT_TOO_LONG); | |
482 | return 0; | |
483 | } | |
484 | ||
485 | if (entropy > 8 * len) { | |
486 | RANDerr(RAND_F_RAND_DRBG_RESTART, RAND_R_ENTROPY_OUT_OF_RANGE); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | /* will be picked up by the rand_drbg_get_entropy() callback */ | |
6decf943 | 491 | drbg->pool = rand_pool_new(entropy, len, len); |
c16de9d8 DMSP |
492 | if (drbg->pool == NULL) |
493 | return 0; | |
494 | ||
6decf943 | 495 | rand_pool_add(drbg->pool, buffer, len, entropy); |
c16de9d8 DMSP |
496 | } else { |
497 | if (drbg->max_adinlen < len) { | |
498 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
499 | RAND_R_ADDITIONAL_INPUT_TOO_LONG); | |
500 | return 0; | |
501 | } | |
502 | adin = buffer; | |
503 | adinlen = len; | |
504 | } | |
505 | } | |
506 | ||
507 | /* repair error state */ | |
efb8128a | 508 | if (drbg->state == DRBG_ERROR) |
c16de9d8 DMSP |
509 | RAND_DRBG_uninstantiate(drbg); |
510 | ||
511 | /* repair uninitialized state */ | |
512 | if (drbg->state == DRBG_UNINITIALISED) { | |
a93ba405 DMSP |
513 | /* reinstantiate drbg */ |
514 | RAND_DRBG_instantiate(drbg, | |
515 | (const unsigned char *) ossl_pers_string, | |
516 | sizeof(ossl_pers_string) - 1); | |
c16de9d8 DMSP |
517 | /* already reseeded. prevent second reseeding below */ |
518 | reseeded = (drbg->state == DRBG_READY); | |
519 | } | |
520 | ||
521 | /* refresh current state if entropy or additional input has been provided */ | |
522 | if (drbg->state == DRBG_READY) { | |
523 | if (adin != NULL) { | |
524 | /* | |
525 | * mix in additional input without reseeding | |
526 | * | |
527 | * Similar to RAND_DRBG_reseed(), but the provided additional | |
528 | * data |adin| is mixed into the current state without pulling | |
529 | * entropy from the trusted entropy source using get_entropy(). | |
530 | * This is not a reseeding in the strict sense of NIST SP 800-90A. | |
531 | */ | |
8212d505 | 532 | drbg->meth->reseed(drbg, adin, adinlen, NULL, 0); |
c16de9d8 DMSP |
533 | } else if (reseeded == 0) { |
534 | /* do a full reseeding if it has not been done yet above */ | |
eb238134 | 535 | RAND_DRBG_reseed(drbg, NULL, 0, 0); |
c16de9d8 DMSP |
536 | } |
537 | } | |
538 | ||
539 | /* check whether a given entropy pool was cleared properly during reseed */ | |
540 | if (drbg->pool != NULL) { | |
541 | drbg->state = DRBG_ERROR; | |
542 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
6decf943 | 543 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
544 | drbg->pool = NULL; |
545 | return 0; | |
546 | } | |
547 | ||
548 | return drbg->state == DRBG_READY; | |
549 | } | |
550 | ||
12fb8c3d RS |
551 | /* |
552 | * Generate |outlen| bytes into the buffer at |out|. Reseed if we need | |
553 | * to or if |prediction_resistance| is set. Additional input can be | |
554 | * sent in |adin| and |adinlen|. | |
c16de9d8 | 555 | * |
2139145b BK |
556 | * Requires that drbg->lock is already locked for write, if non-null. |
557 | * | |
c16de9d8 DMSP |
558 | * Returns 1 on success, 0 on failure. |
559 | * | |
12fb8c3d | 560 | */ |
75e2c877 | 561 | int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen, |
12fb8c3d RS |
562 | int prediction_resistance, |
563 | const unsigned char *adin, size_t adinlen) | |
564 | { | |
e0b625f9 DMSP |
565 | int reseed_required = 0; |
566 | ||
c16de9d8 DMSP |
567 | if (drbg->state != DRBG_READY) { |
568 | /* try to recover from previous errors */ | |
569 | rand_drbg_restart(drbg, NULL, 0, 0); | |
570 | ||
571 | if (drbg->state == DRBG_ERROR) { | |
572 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_IN_ERROR_STATE); | |
573 | return 0; | |
574 | } | |
575 | if (drbg->state == DRBG_UNINITIALISED) { | |
576 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_NOT_INSTANTIATED); | |
577 | return 0; | |
578 | } | |
12fb8c3d | 579 | } |
c16de9d8 | 580 | |
75e2c877 RS |
581 | if (outlen > drbg->max_request) { |
582 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_REQUEST_TOO_LARGE_FOR_DRBG); | |
583 | return 0; | |
584 | } | |
aa048aef | 585 | if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
586 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
587 | return 0; | |
12fb8c3d RS |
588 | } |
589 | ||
a35f607c RS |
590 | if (drbg->fork_count != rand_fork_count) { |
591 | drbg->fork_count = rand_fork_count; | |
e0b625f9 | 592 | reseed_required = 1; |
a35f607c RS |
593 | } |
594 | ||
a93ba405 DMSP |
595 | if (drbg->reseed_interval > 0) { |
596 | if (drbg->generate_counter >= drbg->reseed_interval) | |
597 | reseed_required = 1; | |
598 | } | |
08a65d96 DMSP |
599 | if (drbg->reseed_time_interval > 0) { |
600 | time_t now = time(NULL); | |
601 | if (now < drbg->reseed_time | |
602 | || now - drbg->reseed_time >= drbg->reseed_time_interval) | |
603 | reseed_required = 1; | |
604 | } | |
a93ba405 DMSP |
605 | if (drbg->reseed_counter > 0 && drbg->parent != NULL) { |
606 | if (drbg->reseed_counter != drbg->parent->reseed_counter) | |
607 | reseed_required = 1; | |
608 | } | |
12fb8c3d | 609 | |
e0b625f9 | 610 | if (reseed_required || prediction_resistance) { |
eb238134 | 611 | if (!RAND_DRBG_reseed(drbg, adin, adinlen, prediction_resistance)) { |
75e2c877 RS |
612 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_RESEED_ERROR); |
613 | return 0; | |
12fb8c3d RS |
614 | } |
615 | adin = NULL; | |
616 | adinlen = 0; | |
617 | } | |
618 | ||
8212d505 | 619 | if (!drbg->meth->generate(drbg, out, outlen, adin, adinlen)) { |
75e2c877 RS |
620 | drbg->state = DRBG_ERROR; |
621 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_GENERATE_ERROR); | |
622 | return 0; | |
12fb8c3d | 623 | } |
75e2c877 | 624 | |
a93ba405 | 625 | drbg->generate_counter++; |
e0b625f9 | 626 | |
12fb8c3d | 627 | return 1; |
12fb8c3d RS |
628 | } |
629 | ||
20928ff6 KR |
630 | /* |
631 | * Generates |outlen| random bytes and stores them in |out|. It will | |
632 | * using the given |drbg| to generate the bytes. | |
633 | * | |
634 | * Requires that drbg->lock is already locked for write, if non-null. | |
635 | * | |
636 | * Returns 1 on success 0 on failure. | |
637 | */ | |
638 | int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen) | |
639 | { | |
640 | unsigned char *additional = NULL; | |
641 | size_t additional_len; | |
1648338b | 642 | size_t chunk; |
20928ff6 KR |
643 | size_t ret; |
644 | ||
645 | additional_len = rand_drbg_get_additional_data(&additional, drbg->max_adinlen); | |
1648338b DMSP |
646 | |
647 | for ( ; outlen > 0; outlen -= chunk, out += chunk) { | |
648 | chunk = outlen; | |
649 | if (chunk > drbg->max_request) | |
650 | chunk = drbg->max_request; | |
651 | ret = RAND_DRBG_generate(drbg, out, chunk, 0, additional, additional_len); | |
652 | if (!ret) | |
653 | goto err; | |
654 | } | |
655 | ret = 1; | |
656 | ||
657 | err: | |
20928ff6 KR |
658 | if (additional_len != 0) |
659 | OPENSSL_secure_clear_free(additional, additional_len); | |
660 | ||
661 | return ret; | |
662 | } | |
663 | ||
12fb8c3d | 664 | /* |
c16de9d8 DMSP |
665 | * Set the RAND_DRBG callbacks for obtaining entropy and nonce. |
666 | * | |
a73d990e DMSP |
667 | * Setting the callbacks is allowed only if the drbg has not been |
668 | * initialized yet. Otherwise, the operation will fail. | |
c16de9d8 | 669 | * |
a73d990e | 670 | * Returns 1 on success, 0 on failure. |
12fb8c3d | 671 | */ |
75e2c877 | 672 | int RAND_DRBG_set_callbacks(RAND_DRBG *drbg, |
c16de9d8 DMSP |
673 | RAND_DRBG_get_entropy_fn get_entropy, |
674 | RAND_DRBG_cleanup_entropy_fn cleanup_entropy, | |
675 | RAND_DRBG_get_nonce_fn get_nonce, | |
676 | RAND_DRBG_cleanup_nonce_fn cleanup_nonce) | |
12fb8c3d | 677 | { |
75e2c877 | 678 | if (drbg->state != DRBG_UNINITIALISED) |
12fb8c3d | 679 | return 0; |
c16de9d8 DMSP |
680 | drbg->get_entropy = get_entropy; |
681 | drbg->cleanup_entropy = cleanup_entropy; | |
682 | drbg->get_nonce = get_nonce; | |
683 | drbg->cleanup_nonce = cleanup_nonce; | |
12fb8c3d RS |
684 | return 1; |
685 | } | |
686 | ||
687 | /* | |
75e2c877 | 688 | * Set the reseed interval. |
a93ba405 DMSP |
689 | * |
690 | * The drbg will reseed automatically whenever the number of generate | |
691 | * requests exceeds the given reseed interval. If the reseed interval | |
08a65d96 | 692 | * is 0, then this feature is disabled. |
a93ba405 DMSP |
693 | * |
694 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 695 | */ |
a93ba405 | 696 | int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval) |
12fb8c3d | 697 | { |
a93ba405 | 698 | if (interval > MAX_RESEED_INTERVAL) |
4c75ee85 | 699 | return 0; |
75e2c877 | 700 | drbg->reseed_interval = interval; |
4c75ee85 | 701 | return 1; |
12fb8c3d RS |
702 | } |
703 | ||
08a65d96 DMSP |
704 | /* |
705 | * Set the reseed time interval. | |
706 | * | |
707 | * The drbg will reseed automatically whenever the time elapsed since | |
708 | * the last reseeding exceeds the given reseed time interval. For safety, | |
709 | * a reseeding will also occur if the clock has been reset to a smaller | |
710 | * value. | |
711 | * | |
712 | * Returns 1 on success, 0 on failure. | |
713 | */ | |
714 | int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval) | |
715 | { | |
716 | if (interval > MAX_RESEED_TIME_INTERVAL) | |
717 | return 0; | |
718 | drbg->reseed_time_interval = interval; | |
719 | return 1; | |
720 | } | |
721 | ||
4917e911 DMSP |
722 | /* |
723 | * Set the default values for reseed (time) intervals of new DRBG instances | |
724 | * | |
725 | * The default values can be set independently for master DRBG instances | |
726 | * (without a parent) and slave DRBG instances (with parent). | |
727 | * | |
728 | * Returns 1 on success, 0 on failure. | |
729 | */ | |
730 | ||
731 | int RAND_DRBG_set_reseed_defaults( | |
732 | unsigned int _master_reseed_interval, | |
733 | unsigned int _slave_reseed_interval, | |
734 | time_t _master_reseed_time_interval, | |
735 | time_t _slave_reseed_time_interval | |
736 | ) | |
737 | { | |
738 | if (_master_reseed_interval > MAX_RESEED_INTERVAL | |
739 | || _slave_reseed_interval > MAX_RESEED_INTERVAL) | |
740 | return 0; | |
741 | ||
742 | if (_master_reseed_time_interval > MAX_RESEED_TIME_INTERVAL | |
743 | || _slave_reseed_time_interval > MAX_RESEED_TIME_INTERVAL) | |
744 | return 0; | |
745 | ||
746 | master_reseed_interval = _master_reseed_interval; | |
747 | slave_reseed_interval = _slave_reseed_interval; | |
748 | ||
749 | master_reseed_time_interval = _master_reseed_time_interval; | |
750 | slave_reseed_time_interval = _slave_reseed_time_interval; | |
751 | ||
752 | return 1; | |
753 | } | |
3ce1c27b DMSP |
754 | |
755 | /* | |
756 | * Locks the given drbg. Locking a drbg which does not have locking | |
757 | * enabled is considered a successful no-op. | |
758 | * | |
759 | * Returns 1 on success, 0 on failure. | |
760 | */ | |
812b1537 | 761 | int rand_drbg_lock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
762 | { |
763 | if (drbg->lock != NULL) | |
764 | return CRYPTO_THREAD_write_lock(drbg->lock); | |
765 | ||
766 | return 1; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Unlocks the given drbg. Unlocking a drbg which does not have locking | |
771 | * enabled is considered a successful no-op. | |
772 | * | |
773 | * Returns 1 on success, 0 on failure. | |
774 | */ | |
812b1537 | 775 | int rand_drbg_unlock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
776 | { |
777 | if (drbg->lock != NULL) | |
778 | return CRYPTO_THREAD_unlock(drbg->lock); | |
779 | ||
780 | return 1; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Enables locking for the given drbg | |
785 | * | |
786 | * Locking can only be enabled if the random generator | |
787 | * is in the uninitialized state. | |
788 | * | |
789 | * Returns 1 on success, 0 on failure. | |
790 | */ | |
812b1537 | 791 | int rand_drbg_enable_locking(RAND_DRBG *drbg) |
3ce1c27b DMSP |
792 | { |
793 | if (drbg->state != DRBG_UNINITIALISED) { | |
794 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
795 | RAND_R_DRBG_ALREADY_INITIALIZED); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | if (drbg->lock == NULL) { | |
4f9dabbf | 800 | if (drbg->parent != NULL && drbg->parent->lock == NULL) { |
3ce1c27b DMSP |
801 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, |
802 | RAND_R_PARENT_LOCKING_NOT_ENABLED); | |
803 | return 0; | |
804 | } | |
805 | ||
806 | drbg->lock = CRYPTO_THREAD_lock_new(); | |
807 | if (drbg->lock == NULL) { | |
808 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
809 | RAND_R_FAILED_TO_CREATE_LOCK); | |
810 | return 0; | |
811 | } | |
812 | } | |
813 | ||
814 | return 1; | |
815 | } | |
816 | ||
12fb8c3d RS |
817 | /* |
818 | * Get and set the EXDATA | |
819 | */ | |
75e2c877 RS |
820 | int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg) |
821 | { | |
822 | return CRYPTO_set_ex_data(&drbg->ex_data, idx, arg); | |
823 | } | |
824 | ||
825 | void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx) | |
826 | { | |
827 | return CRYPTO_get_ex_data(&drbg->ex_data, idx); | |
828 | } | |
829 | ||
830 | ||
831 | /* | |
832 | * The following functions provide a RAND_METHOD that works on the | |
833 | * global DRBG. They lock. | |
834 | */ | |
835 | ||
0b14a5b7 | 836 | /* |
933033b6 DMSP |
837 | * Allocates a new global DRBG on the secure heap (if enabled) and |
838 | * initializes it with default settings. | |
a93ba405 DMSP |
839 | * |
840 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
0b14a5b7 | 841 | */ |
63ab5ea1 | 842 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent) |
0b14a5b7 | 843 | { |
933033b6 | 844 | RAND_DRBG *drbg; |
0b14a5b7 | 845 | |
31393fd9 | 846 | drbg = RAND_DRBG_secure_new(rand_drbg_type, rand_drbg_flags, parent); |
933033b6 DMSP |
847 | if (drbg == NULL) |
848 | return NULL; | |
849 | ||
7caf122e KR |
850 | /* Only the master DRBG needs to have a lock */ |
851 | if (parent == NULL && rand_drbg_enable_locking(drbg) == 0) | |
933033b6 | 852 | goto err; |
a93ba405 | 853 | |
a93ba405 DMSP |
854 | /* enable seed propagation */ |
855 | drbg->reseed_counter = 1; | |
856 | ||
c16de9d8 DMSP |
857 | /* |
858 | * Ignore instantiation error so support just-in-time instantiation. | |
859 | * | |
860 | * The state of the drbg will be checked in RAND_DRBG_generate() and | |
861 | * an automatic recovery is attempted. | |
862 | */ | |
863 | RAND_DRBG_instantiate(drbg, | |
864 | (const unsigned char *) ossl_pers_string, | |
865 | sizeof(ossl_pers_string) - 1); | |
933033b6 DMSP |
866 | return drbg; |
867 | ||
868 | err: | |
4f9dabbf | 869 | RAND_DRBG_free(drbg); |
933033b6 | 870 | return NULL; |
0b14a5b7 KR |
871 | } |
872 | ||
873 | /* | |
874 | * Initialize the global DRBGs on first use. | |
875 | * Returns 1 on success, 0 on failure. | |
876 | */ | |
c16de9d8 | 877 | DEFINE_RUN_ONCE_STATIC(do_rand_drbg_init) |
0b14a5b7 | 878 | { |
7caf122e KR |
879 | int ret = 1; |
880 | ||
39571fca DMSP |
881 | /* |
882 | * ensure that libcrypto is initialized, otherwise the | |
883 | * DRBG locks are not cleaned up properly | |
884 | */ | |
885 | if (!OPENSSL_init_crypto(0, NULL)) | |
886 | return 0; | |
887 | ||
7caf122e KR |
888 | ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND); |
889 | ||
a73d990e | 890 | master_drbg = drbg_setup(NULL); |
0b14a5b7 | 891 | |
a73d990e DMSP |
892 | ret &= CRYPTO_THREAD_init_local(&private_drbg, NULL); |
893 | ret &= CRYPTO_THREAD_init_local(&public_drbg, NULL); | |
7caf122e | 894 | |
a73d990e | 895 | if (master_drbg == NULL || ret == 0) |
933033b6 | 896 | return 0; |
0b14a5b7 | 897 | |
933033b6 | 898 | return 1; |
0b14a5b7 KR |
899 | } |
900 | ||
0b14a5b7 | 901 | /* Clean up the global DRBGs before exit */ |
c16de9d8 | 902 | void rand_drbg_cleanup_int(void) |
0b14a5b7 | 903 | { |
a73d990e DMSP |
904 | RAND_DRBG_free(master_drbg); |
905 | master_drbg = NULL; | |
933033b6 | 906 | |
a73d990e DMSP |
907 | CRYPTO_THREAD_cleanup_local(&private_drbg); |
908 | CRYPTO_THREAD_cleanup_local(&public_drbg); | |
7caf122e KR |
909 | } |
910 | ||
911 | void drbg_delete_thread_state() | |
912 | { | |
913 | RAND_DRBG *drbg; | |
914 | ||
a73d990e | 915 | drbg = CRYPTO_THREAD_get_local(&public_drbg); |
7caf122e KR |
916 | RAND_DRBG_free(drbg); |
917 | ||
a73d990e | 918 | drbg = CRYPTO_THREAD_get_local(&private_drbg); |
7caf122e | 919 | RAND_DRBG_free(drbg); |
0b14a5b7 KR |
920 | } |
921 | ||
c16de9d8 | 922 | /* Implements the default OpenSSL RAND_bytes() method */ |
75e2c877 RS |
923 | static int drbg_bytes(unsigned char *out, int count) |
924 | { | |
f61f62ea | 925 | int ret; |
a93ba405 | 926 | RAND_DRBG *drbg = RAND_DRBG_get0_public(); |
75e2c877 | 927 | |
0b14a5b7 KR |
928 | if (drbg == NULL) |
929 | return 0; | |
930 | ||
f61f62ea | 931 | ret = RAND_DRBG_bytes(drbg, out, count); |
f61f62ea | 932 | |
75e2c877 RS |
933 | return ret; |
934 | } | |
935 | ||
c16de9d8 | 936 | /* Implements the default OpenSSL RAND_add() method */ |
75e2c877 RS |
937 | static int drbg_add(const void *buf, int num, double randomness) |
938 | { | |
c16de9d8 | 939 | int ret = 0; |
a93ba405 | 940 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
75e2c877 | 941 | |
c16de9d8 DMSP |
942 | if (drbg == NULL) |
943 | return 0; | |
75e2c877 | 944 | |
c16de9d8 DMSP |
945 | if (num < 0 || randomness < 0.0) |
946 | return 0; | |
75e2c877 | 947 | |
c16de9d8 DMSP |
948 | if (randomness > (double)drbg->max_entropylen) { |
949 | /* | |
950 | * The purpose of this check is to bound |randomness| by a | |
951 | * relatively small value in order to prevent an integer | |
952 | * overflow when multiplying by 8 in the rand_drbg_restart() | |
953 | * call below. | |
954 | */ | |
955 | return 0; | |
75e2c877 RS |
956 | } |
957 | ||
812b1537 | 958 | rand_drbg_lock(drbg); |
c16de9d8 DMSP |
959 | ret = rand_drbg_restart(drbg, buf, |
960 | (size_t)(unsigned int)num, | |
961 | (size_t)(8*randomness)); | |
812b1537 | 962 | rand_drbg_unlock(drbg); |
c16de9d8 DMSP |
963 | |
964 | return ret; | |
75e2c877 RS |
965 | } |
966 | ||
c16de9d8 | 967 | /* Implements the default OpenSSL RAND_seed() method */ |
75e2c877 RS |
968 | static int drbg_seed(const void *buf, int num) |
969 | { | |
970 | return drbg_add(buf, num, num); | |
971 | } | |
972 | ||
c16de9d8 | 973 | /* Implements the default OpenSSL RAND_status() method */ |
75e2c877 | 974 | static int drbg_status(void) |
12fb8c3d | 975 | { |
75e2c877 | 976 | int ret; |
a93ba405 | 977 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
0b14a5b7 KR |
978 | |
979 | if (drbg == NULL) | |
980 | return 0; | |
75e2c877 | 981 | |
812b1537 | 982 | rand_drbg_lock(drbg); |
0b14a5b7 | 983 | ret = drbg->state == DRBG_READY ? 1 : 0; |
812b1537 | 984 | rand_drbg_unlock(drbg); |
75e2c877 | 985 | return ret; |
12fb8c3d RS |
986 | } |
987 | ||
0b14a5b7 | 988 | /* |
a93ba405 DMSP |
989 | * Get the master DRBG. |
990 | * Returns pointer to the DRBG on success, NULL on failure. | |
991 | * | |
992 | */ | |
993 | RAND_DRBG *RAND_DRBG_get0_master(void) | |
994 | { | |
995 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) | |
996 | return NULL; | |
997 | ||
a73d990e | 998 | return master_drbg; |
a93ba405 DMSP |
999 | } |
1000 | ||
1001 | /* | |
1002 | * Get the public DRBG. | |
0b14a5b7 KR |
1003 | * Returns pointer to the DRBG on success, NULL on failure. |
1004 | */ | |
a93ba405 | 1005 | RAND_DRBG *RAND_DRBG_get0_public(void) |
0b14a5b7 | 1006 | { |
7caf122e KR |
1007 | RAND_DRBG *drbg; |
1008 | ||
c16de9d8 | 1009 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
1010 | return NULL; |
1011 | ||
a73d990e | 1012 | drbg = CRYPTO_THREAD_get_local(&public_drbg); |
7caf122e KR |
1013 | if (drbg == NULL) { |
1014 | ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND); | |
a73d990e DMSP |
1015 | drbg = drbg_setup(master_drbg); |
1016 | CRYPTO_THREAD_set_local(&public_drbg, drbg); | |
7caf122e KR |
1017 | } |
1018 | return drbg; | |
0b14a5b7 KR |
1019 | } |
1020 | ||
1021 | /* | |
a93ba405 | 1022 | * Get the private DRBG. |
0b14a5b7 KR |
1023 | * Returns pointer to the DRBG on success, NULL on failure. |
1024 | */ | |
a93ba405 | 1025 | RAND_DRBG *RAND_DRBG_get0_private(void) |
0b14a5b7 | 1026 | { |
7caf122e KR |
1027 | RAND_DRBG *drbg; |
1028 | ||
c16de9d8 | 1029 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
1030 | return NULL; |
1031 | ||
a73d990e | 1032 | drbg = CRYPTO_THREAD_get_local(&private_drbg); |
7caf122e KR |
1033 | if (drbg == NULL) { |
1034 | ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND); | |
a73d990e DMSP |
1035 | drbg = drbg_setup(master_drbg); |
1036 | CRYPTO_THREAD_set_local(&private_drbg, drbg); | |
7caf122e KR |
1037 | } |
1038 | return drbg; | |
0b14a5b7 KR |
1039 | } |
1040 | ||
75e2c877 RS |
1041 | RAND_METHOD rand_meth = { |
1042 | drbg_seed, | |
1043 | drbg_bytes, | |
ddc6a5c8 | 1044 | NULL, |
75e2c877 RS |
1045 | drbg_add, |
1046 | drbg_bytes, | |
1047 | drbg_status | |
1048 | }; | |
1049 | ||
1050 | RAND_METHOD *RAND_OpenSSL(void) | |
12fb8c3d | 1051 | { |
75e2c877 | 1052 | return &rand_meth; |
12fb8c3d | 1053 | } |