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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 | ||
4917e911 DMSP |
116 | static unsigned int master_reseed_interval = MASTER_RESEED_INTERVAL; |
117 | static unsigned int slave_reseed_interval = SLAVE_RESEED_INTERVAL; | |
118 | ||
119 | static time_t master_reseed_time_interval = MASTER_RESEED_TIME_INTERVAL; | |
120 | static time_t slave_reseed_time_interval = SLAVE_RESEED_TIME_INTERVAL; | |
121 | ||
63ab5ea1 | 122 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent); |
4f9dabbf DMSP |
123 | |
124 | static RAND_DRBG *rand_drbg_new(int secure, | |
125 | int type, | |
126 | unsigned int flags, | |
127 | RAND_DRBG *parent); | |
0b14a5b7 | 128 | |
12fb8c3d | 129 | /* |
75e2c877 | 130 | * Set/initialize |drbg| to be of type |nid|, with optional |flags|. |
efb8128a DMSP |
131 | * |
132 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 133 | */ |
75e2c877 | 134 | int RAND_DRBG_set(RAND_DRBG *drbg, int nid, unsigned int flags) |
12fb8c3d RS |
135 | { |
136 | int ret = 1; | |
137 | ||
75e2c877 RS |
138 | drbg->state = DRBG_UNINITIALISED; |
139 | drbg->flags = flags; | |
140 | drbg->nid = nid; | |
12fb8c3d RS |
141 | |
142 | switch (nid) { | |
143 | default: | |
144 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE); | |
efb8128a | 145 | return 0; |
12fb8c3d RS |
146 | case 0: |
147 | /* Uninitialized; that's okay. */ | |
148 | return 1; | |
149 | case NID_aes_128_ctr: | |
150 | case NID_aes_192_ctr: | |
151 | case NID_aes_256_ctr: | |
8212d505 | 152 | ret = drbg_ctr_init(drbg); |
12fb8c3d RS |
153 | break; |
154 | } | |
155 | ||
efb8128a | 156 | if (ret == 0) |
12fb8c3d RS |
157 | RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_ERROR_INITIALISING_DRBG); |
158 | return ret; | |
159 | } | |
160 | ||
161 | /* | |
4f9dabbf DMSP |
162 | * Allocate memory and initialize a new DRBG. The DRBG is allocated on |
163 | * the secure heap if |secure| is nonzero and the secure heap is enabled. | |
164 | * The |parent|, if not NULL, will be used as random source for reseeding. | |
a93ba405 DMSP |
165 | * |
166 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
12fb8c3d | 167 | */ |
4f9dabbf DMSP |
168 | static RAND_DRBG *rand_drbg_new(int secure, |
169 | int type, | |
170 | unsigned int flags, | |
171 | RAND_DRBG *parent) | |
12fb8c3d | 172 | { |
4f9dabbf DMSP |
173 | RAND_DRBG *drbg = secure ? |
174 | OPENSSL_secure_zalloc(sizeof(*drbg)) : OPENSSL_zalloc(sizeof(*drbg)); | |
12fb8c3d | 175 | |
9d951a78 | 176 | if (drbg == NULL) { |
12fb8c3d | 177 | RANDerr(RAND_F_RAND_DRBG_NEW, ERR_R_MALLOC_FAILURE); |
75e2c877 | 178 | goto err; |
12fb8c3d | 179 | } |
4f9dabbf DMSP |
180 | |
181 | drbg->secure = secure && CRYPTO_secure_allocated(drbg); | |
a35f607c | 182 | drbg->fork_count = rand_fork_count; |
75e2c877 | 183 | drbg->parent = parent; |
4917e911 DMSP |
184 | |
185 | if (parent == NULL) { | |
186 | drbg->reseed_interval = master_reseed_interval; | |
187 | drbg->reseed_time_interval = master_reseed_time_interval; | |
188 | } else { | |
189 | drbg->reseed_interval = slave_reseed_interval; | |
190 | drbg->reseed_time_interval = slave_reseed_time_interval; | |
191 | } | |
192 | ||
efb8128a | 193 | if (RAND_DRBG_set(drbg, type, flags) == 0) |
75e2c877 RS |
194 | goto err; |
195 | ||
35503b7c KR |
196 | if (parent != NULL && drbg->strength > parent->strength) { |
197 | /* | |
198 | * We currently don't support the algorithm from NIST SP 800-90C | |
199 | * 10.1.2 to use a weaker DRBG as source | |
200 | */ | |
201 | RANDerr(RAND_F_RAND_DRBG_NEW, RAND_R_PARENT_STRENGTH_TOO_WEAK); | |
202 | goto err; | |
203 | } | |
204 | ||
a93ba405 DMSP |
205 | if (!RAND_DRBG_set_callbacks(drbg, rand_drbg_get_entropy, |
206 | rand_drbg_cleanup_entropy, | |
207 | NULL, NULL)) | |
208 | goto err; | |
75e2c877 RS |
209 | |
210 | return drbg; | |
211 | ||
212 | err: | |
4f9dabbf DMSP |
213 | if (drbg->secure) |
214 | OPENSSL_secure_free(drbg); | |
215 | else | |
216 | OPENSSL_free(drbg); | |
217 | ||
75e2c877 | 218 | return NULL; |
12fb8c3d RS |
219 | } |
220 | ||
4f9dabbf DMSP |
221 | RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) |
222 | { | |
223 | return rand_drbg_new(0, type, flags, parent); | |
224 | } | |
225 | ||
226 | RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent) | |
227 | { | |
228 | return rand_drbg_new(1, type, flags, parent); | |
229 | } | |
230 | ||
12fb8c3d | 231 | /* |
75e2c877 | 232 | * Uninstantiate |drbg| and free all memory. |
12fb8c3d | 233 | */ |
75e2c877 | 234 | void RAND_DRBG_free(RAND_DRBG *drbg) |
12fb8c3d | 235 | { |
c16de9d8 | 236 | if (drbg == NULL) |
12fb8c3d RS |
237 | return; |
238 | ||
8212d505 DMSP |
239 | if (drbg->meth != NULL) |
240 | drbg->meth->uninstantiate(drbg); | |
4f9dabbf | 241 | CRYPTO_THREAD_lock_free(drbg->lock); |
75e2c877 | 242 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data); |
4f9dabbf DMSP |
243 | |
244 | if (drbg->secure) | |
245 | OPENSSL_secure_clear_free(drbg, sizeof(*drbg)); | |
246 | else | |
247 | OPENSSL_clear_free(drbg, sizeof(*drbg)); | |
12fb8c3d RS |
248 | } |
249 | ||
250 | /* | |
75e2c877 | 251 | * Instantiate |drbg|, after it has been initialized. Use |pers| and |
12fb8c3d | 252 | * |perslen| as prediction-resistance input. |
2139145b BK |
253 | * |
254 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
255 | * |
256 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 257 | */ |
75e2c877 | 258 | int RAND_DRBG_instantiate(RAND_DRBG *drbg, |
12fb8c3d RS |
259 | const unsigned char *pers, size_t perslen) |
260 | { | |
12fb8c3d | 261 | unsigned char *nonce = NULL, *entropy = NULL; |
aa048aef | 262 | size_t noncelen = 0, entropylen = 0; |
12fb8c3d | 263 | |
aa048aef | 264 | if (perslen > drbg->max_perslen) { |
75e2c877 RS |
265 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
266 | RAND_R_PERSONALISATION_STRING_TOO_LONG); | |
12fb8c3d RS |
267 | goto end; |
268 | } | |
8212d505 DMSP |
269 | |
270 | if (drbg->meth == NULL) | |
271 | { | |
272 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
273 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
274 | goto end; | |
275 | } | |
276 | ||
75e2c877 RS |
277 | if (drbg->state != DRBG_UNINITIALISED) { |
278 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
279 | drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE | |
280 | : RAND_R_ALREADY_INSTANTIATED); | |
12fb8c3d RS |
281 | goto end; |
282 | } | |
283 | ||
75e2c877 RS |
284 | drbg->state = DRBG_ERROR; |
285 | if (drbg->get_entropy != NULL) | |
aa048aef DMSP |
286 | entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
287 | drbg->min_entropylen, drbg->max_entropylen); | |
c16de9d8 DMSP |
288 | if (entropylen < drbg->min_entropylen |
289 | || entropylen > drbg->max_entropylen) { | |
75e2c877 | 290 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
291 | goto end; |
292 | } | |
293 | ||
aa048aef | 294 | if (drbg->max_noncelen > 0 && drbg->get_nonce != NULL) { |
75e2c877 | 295 | noncelen = drbg->get_nonce(drbg, &nonce, drbg->strength / 2, |
aa048aef DMSP |
296 | drbg->min_noncelen, drbg->max_noncelen); |
297 | if (noncelen < drbg->min_noncelen || noncelen > drbg->max_noncelen) { | |
c16de9d8 DMSP |
298 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, |
299 | RAND_R_ERROR_RETRIEVING_NONCE); | |
12fb8c3d RS |
300 | goto end; |
301 | } | |
302 | } | |
303 | ||
8212d505 | 304 | if (!drbg->meth->instantiate(drbg, entropy, entropylen, |
12fb8c3d | 305 | nonce, noncelen, pers, perslen)) { |
75e2c877 | 306 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_INSTANTIATING_DRBG); |
12fb8c3d RS |
307 | goto end; |
308 | } | |
309 | ||
75e2c877 | 310 | drbg->state = DRBG_READY; |
a93ba405 | 311 | drbg->generate_counter = 0; |
08a65d96 | 312 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
313 | if (drbg->reseed_counter > 0) { |
314 | if (drbg->parent == NULL) | |
315 | drbg->reseed_counter++; | |
316 | else | |
317 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
318 | } | |
12fb8c3d RS |
319 | |
320 | end: | |
75e2c877 | 321 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 322 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 323 | if (nonce != NULL && drbg->cleanup_nonce!= NULL ) |
6969a3f4 | 324 | drbg->cleanup_nonce(drbg, nonce, noncelen); |
c16de9d8 DMSP |
325 | if (drbg->pool != NULL) { |
326 | if (drbg->state == DRBG_READY) { | |
327 | RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, | |
328 | RAND_R_ERROR_ENTROPY_POOL_WAS_IGNORED); | |
329 | drbg->state = DRBG_ERROR; | |
330 | } | |
6decf943 | 331 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
332 | drbg->pool = NULL; |
333 | } | |
75e2c877 | 334 | if (drbg->state == DRBG_READY) |
12fb8c3d | 335 | return 1; |
12fb8c3d RS |
336 | return 0; |
337 | } | |
338 | ||
339 | /* | |
75e2c877 | 340 | * Uninstantiate |drbg|. Must be instantiated before it can be used. |
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_uninstantiate(RAND_DRBG *drbg) |
12fb8c3d | 347 | { |
8212d505 DMSP |
348 | if (drbg->meth == NULL) |
349 | { | |
350 | RANDerr(RAND_F_RAND_DRBG_UNINSTANTIATE, | |
351 | RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED); | |
352 | return 0; | |
353 | } | |
354 | ||
efb8128a DMSP |
355 | /* Clear the entire drbg->ctr struct, then reset some important |
356 | * members of the drbg->ctr struct (e.g. keysize, df_ks) to their | |
357 | * initial values. | |
358 | */ | |
8212d505 | 359 | drbg->meth->uninstantiate(drbg); |
efb8128a | 360 | return RAND_DRBG_set(drbg, drbg->nid, drbg->flags); |
12fb8c3d RS |
361 | } |
362 | ||
363 | /* | |
c16de9d8 | 364 | * Reseed |drbg|, mixing in the specified data |
2139145b BK |
365 | * |
366 | * Requires that drbg->lock is already locked for write, if non-null. | |
efb8128a DMSP |
367 | * |
368 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 369 | */ |
75e2c877 | 370 | int RAND_DRBG_reseed(RAND_DRBG *drbg, |
12fb8c3d RS |
371 | const unsigned char *adin, size_t adinlen) |
372 | { | |
373 | unsigned char *entropy = NULL; | |
aa048aef | 374 | size_t entropylen = 0; |
75e2c877 RS |
375 | |
376 | if (drbg->state == DRBG_ERROR) { | |
377 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_IN_ERROR_STATE); | |
378 | return 0; | |
379 | } | |
380 | if (drbg->state == DRBG_UNINITIALISED) { | |
381 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_NOT_INSTANTIATED); | |
382 | return 0; | |
12fb8c3d RS |
383 | } |
384 | ||
385 | if (adin == NULL) | |
386 | adinlen = 0; | |
aa048aef | 387 | else if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
388 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
389 | return 0; | |
12fb8c3d RS |
390 | } |
391 | ||
75e2c877 RS |
392 | drbg->state = DRBG_ERROR; |
393 | if (drbg->get_entropy != NULL) | |
aa048aef DMSP |
394 | entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength, |
395 | drbg->min_entropylen, drbg->max_entropylen); | |
c16de9d8 DMSP |
396 | if (entropylen < drbg->min_entropylen |
397 | || entropylen > drbg->max_entropylen) { | |
75e2c877 | 398 | RANDerr(RAND_F_RAND_DRBG_RESEED, RAND_R_ERROR_RETRIEVING_ENTROPY); |
12fb8c3d RS |
399 | goto end; |
400 | } | |
401 | ||
8212d505 | 402 | if (!drbg->meth->reseed(drbg, entropy, entropylen, adin, adinlen)) |
12fb8c3d | 403 | goto end; |
a93ba405 | 404 | |
75e2c877 | 405 | drbg->state = DRBG_READY; |
a93ba405 | 406 | drbg->generate_counter = 0; |
08a65d96 | 407 | drbg->reseed_time = time(NULL); |
a93ba405 DMSP |
408 | if (drbg->reseed_counter > 0) { |
409 | if (drbg->parent == NULL) | |
410 | drbg->reseed_counter++; | |
411 | else | |
412 | drbg->reseed_counter = drbg->parent->reseed_counter; | |
413 | } | |
12fb8c3d RS |
414 | |
415 | end: | |
75e2c877 | 416 | if (entropy != NULL && drbg->cleanup_entropy != NULL) |
6969a3f4 | 417 | drbg->cleanup_entropy(drbg, entropy, entropylen); |
75e2c877 | 418 | if (drbg->state == DRBG_READY) |
12fb8c3d | 419 | return 1; |
12fb8c3d RS |
420 | return 0; |
421 | } | |
422 | ||
c16de9d8 DMSP |
423 | /* |
424 | * Restart |drbg|, using the specified entropy or additional input | |
425 | * | |
426 | * Tries its best to get the drbg instantiated by all means, | |
427 | * regardless of its current state. | |
428 | * | |
429 | * Optionally, a |buffer| of |len| random bytes can be passed, | |
430 | * which is assumed to contain at least |entropy| bits of entropy. | |
431 | * | |
432 | * If |entropy| > 0, the buffer content is used as entropy input. | |
433 | * | |
434 | * If |entropy| == 0, the buffer content is used as additional input | |
435 | * | |
436 | * Returns 1 on success, 0 on failure. | |
437 | * | |
438 | * This function is used internally only. | |
439 | */ | |
440 | int rand_drbg_restart(RAND_DRBG *drbg, | |
441 | const unsigned char *buffer, size_t len, size_t entropy) | |
442 | { | |
443 | int reseeded = 0; | |
444 | const unsigned char *adin = NULL; | |
445 | size_t adinlen = 0; | |
446 | ||
447 | if (drbg->pool != NULL) { | |
448 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
6decf943 | 449 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
450 | drbg->pool = NULL; |
451 | } | |
452 | ||
453 | if (buffer != NULL) { | |
454 | if (entropy > 0) { | |
455 | if (drbg->max_entropylen < len) { | |
456 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
457 | RAND_R_ENTROPY_INPUT_TOO_LONG); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | if (entropy > 8 * len) { | |
462 | RANDerr(RAND_F_RAND_DRBG_RESTART, RAND_R_ENTROPY_OUT_OF_RANGE); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | /* will be picked up by the rand_drbg_get_entropy() callback */ | |
6decf943 | 467 | drbg->pool = rand_pool_new(entropy, len, len); |
c16de9d8 DMSP |
468 | if (drbg->pool == NULL) |
469 | return 0; | |
470 | ||
6decf943 | 471 | rand_pool_add(drbg->pool, buffer, len, entropy); |
c16de9d8 DMSP |
472 | } else { |
473 | if (drbg->max_adinlen < len) { | |
474 | RANDerr(RAND_F_RAND_DRBG_RESTART, | |
475 | RAND_R_ADDITIONAL_INPUT_TOO_LONG); | |
476 | return 0; | |
477 | } | |
478 | adin = buffer; | |
479 | adinlen = len; | |
480 | } | |
481 | } | |
482 | ||
483 | /* repair error state */ | |
efb8128a | 484 | if (drbg->state == DRBG_ERROR) |
c16de9d8 DMSP |
485 | RAND_DRBG_uninstantiate(drbg); |
486 | ||
487 | /* repair uninitialized state */ | |
488 | if (drbg->state == DRBG_UNINITIALISED) { | |
a93ba405 DMSP |
489 | /* reinstantiate drbg */ |
490 | RAND_DRBG_instantiate(drbg, | |
491 | (const unsigned char *) ossl_pers_string, | |
492 | sizeof(ossl_pers_string) - 1); | |
c16de9d8 DMSP |
493 | /* already reseeded. prevent second reseeding below */ |
494 | reseeded = (drbg->state == DRBG_READY); | |
495 | } | |
496 | ||
497 | /* refresh current state if entropy or additional input has been provided */ | |
498 | if (drbg->state == DRBG_READY) { | |
499 | if (adin != NULL) { | |
500 | /* | |
501 | * mix in additional input without reseeding | |
502 | * | |
503 | * Similar to RAND_DRBG_reseed(), but the provided additional | |
504 | * data |adin| is mixed into the current state without pulling | |
505 | * entropy from the trusted entropy source using get_entropy(). | |
506 | * This is not a reseeding in the strict sense of NIST SP 800-90A. | |
507 | */ | |
8212d505 | 508 | drbg->meth->reseed(drbg, adin, adinlen, NULL, 0); |
c16de9d8 DMSP |
509 | } else if (reseeded == 0) { |
510 | /* do a full reseeding if it has not been done yet above */ | |
511 | RAND_DRBG_reseed(drbg, NULL, 0); | |
512 | } | |
513 | } | |
514 | ||
515 | /* check whether a given entropy pool was cleared properly during reseed */ | |
516 | if (drbg->pool != NULL) { | |
517 | drbg->state = DRBG_ERROR; | |
518 | RANDerr(RAND_F_RAND_DRBG_RESTART, ERR_R_INTERNAL_ERROR); | |
6decf943 | 519 | rand_pool_free(drbg->pool); |
c16de9d8 DMSP |
520 | drbg->pool = NULL; |
521 | return 0; | |
522 | } | |
523 | ||
524 | return drbg->state == DRBG_READY; | |
525 | } | |
526 | ||
12fb8c3d RS |
527 | /* |
528 | * Generate |outlen| bytes into the buffer at |out|. Reseed if we need | |
529 | * to or if |prediction_resistance| is set. Additional input can be | |
530 | * sent in |adin| and |adinlen|. | |
c16de9d8 | 531 | * |
2139145b BK |
532 | * Requires that drbg->lock is already locked for write, if non-null. |
533 | * | |
c16de9d8 DMSP |
534 | * Returns 1 on success, 0 on failure. |
535 | * | |
12fb8c3d | 536 | */ |
75e2c877 | 537 | int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen, |
12fb8c3d RS |
538 | int prediction_resistance, |
539 | const unsigned char *adin, size_t adinlen) | |
540 | { | |
e0b625f9 DMSP |
541 | int reseed_required = 0; |
542 | ||
c16de9d8 DMSP |
543 | if (drbg->state != DRBG_READY) { |
544 | /* try to recover from previous errors */ | |
545 | rand_drbg_restart(drbg, NULL, 0, 0); | |
546 | ||
547 | if (drbg->state == DRBG_ERROR) { | |
548 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_IN_ERROR_STATE); | |
549 | return 0; | |
550 | } | |
551 | if (drbg->state == DRBG_UNINITIALISED) { | |
552 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_NOT_INSTANTIATED); | |
553 | return 0; | |
554 | } | |
12fb8c3d | 555 | } |
c16de9d8 | 556 | |
75e2c877 RS |
557 | if (outlen > drbg->max_request) { |
558 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_REQUEST_TOO_LARGE_FOR_DRBG); | |
559 | return 0; | |
560 | } | |
aa048aef | 561 | if (adinlen > drbg->max_adinlen) { |
75e2c877 RS |
562 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_ADDITIONAL_INPUT_TOO_LONG); |
563 | return 0; | |
12fb8c3d RS |
564 | } |
565 | ||
a35f607c RS |
566 | if (drbg->fork_count != rand_fork_count) { |
567 | drbg->fork_count = rand_fork_count; | |
e0b625f9 | 568 | reseed_required = 1; |
a35f607c RS |
569 | } |
570 | ||
a93ba405 DMSP |
571 | if (drbg->reseed_interval > 0) { |
572 | if (drbg->generate_counter >= drbg->reseed_interval) | |
573 | reseed_required = 1; | |
574 | } | |
08a65d96 DMSP |
575 | if (drbg->reseed_time_interval > 0) { |
576 | time_t now = time(NULL); | |
577 | if (now < drbg->reseed_time | |
578 | || now - drbg->reseed_time >= drbg->reseed_time_interval) | |
579 | reseed_required = 1; | |
580 | } | |
a93ba405 DMSP |
581 | if (drbg->reseed_counter > 0 && drbg->parent != NULL) { |
582 | if (drbg->reseed_counter != drbg->parent->reseed_counter) | |
583 | reseed_required = 1; | |
584 | } | |
12fb8c3d | 585 | |
e0b625f9 | 586 | if (reseed_required || prediction_resistance) { |
75e2c877 RS |
587 | if (!RAND_DRBG_reseed(drbg, adin, adinlen)) { |
588 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_RESEED_ERROR); | |
589 | return 0; | |
12fb8c3d RS |
590 | } |
591 | adin = NULL; | |
592 | adinlen = 0; | |
593 | } | |
594 | ||
8212d505 | 595 | if (!drbg->meth->generate(drbg, out, outlen, adin, adinlen)) { |
75e2c877 RS |
596 | drbg->state = DRBG_ERROR; |
597 | RANDerr(RAND_F_RAND_DRBG_GENERATE, RAND_R_GENERATE_ERROR); | |
598 | return 0; | |
12fb8c3d | 599 | } |
75e2c877 | 600 | |
a93ba405 | 601 | drbg->generate_counter++; |
e0b625f9 | 602 | |
12fb8c3d | 603 | return 1; |
12fb8c3d RS |
604 | } |
605 | ||
20928ff6 KR |
606 | /* |
607 | * Generates |outlen| random bytes and stores them in |out|. It will | |
608 | * using the given |drbg| to generate the bytes. | |
609 | * | |
610 | * Requires that drbg->lock is already locked for write, if non-null. | |
611 | * | |
612 | * Returns 1 on success 0 on failure. | |
613 | */ | |
614 | int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen) | |
615 | { | |
616 | unsigned char *additional = NULL; | |
617 | size_t additional_len; | |
1648338b | 618 | size_t chunk; |
20928ff6 KR |
619 | size_t ret; |
620 | ||
621 | additional_len = rand_drbg_get_additional_data(&additional, drbg->max_adinlen); | |
1648338b DMSP |
622 | |
623 | for ( ; outlen > 0; outlen -= chunk, out += chunk) { | |
624 | chunk = outlen; | |
625 | if (chunk > drbg->max_request) | |
626 | chunk = drbg->max_request; | |
627 | ret = RAND_DRBG_generate(drbg, out, chunk, 0, additional, additional_len); | |
628 | if (!ret) | |
629 | goto err; | |
630 | } | |
631 | ret = 1; | |
632 | ||
633 | err: | |
20928ff6 KR |
634 | if (additional_len != 0) |
635 | OPENSSL_secure_clear_free(additional, additional_len); | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
12fb8c3d | 640 | /* |
c16de9d8 DMSP |
641 | * Set the RAND_DRBG callbacks for obtaining entropy and nonce. |
642 | * | |
643 | * In the following, the signature and the semantics of the | |
644 | * get_entropy() and cleanup_entropy() callbacks are explained. | |
645 | * | |
646 | * GET_ENTROPY | |
647 | * | |
648 | * size_t get_entropy(RAND_DRBG *ctx, | |
649 | * unsigned char **pout, | |
650 | * int entropy, | |
651 | * size_t min_len, size_t max_len); | |
652 | * | |
653 | * This is a request to allocate and fill a buffer of size | |
654 | * |min_len| <= size <= |max_len| (in bytes) which contains | |
655 | * at least |entropy| bits of randomness. The buffer's address is | |
656 | * to be returned in |*pout| and the number of collected | |
657 | * randomness bytes (which may be less than the allocated size | |
658 | * of the buffer) as return value. | |
659 | * | |
660 | * If the callback fails to acquire at least |entropy| bits of | |
661 | * randomness, it shall return a buffer length of 0. | |
662 | * | |
663 | * CLEANUP_ENTROPY | |
664 | * | |
665 | * void cleanup_entropy(RAND_DRBG *ctx, | |
666 | * unsigned char *out, size_t outlen); | |
667 | * | |
668 | * A request to clear and free the buffer allocated by get_entropy(). | |
669 | * The values |out| and |outlen| are expected to be the random buffer's | |
670 | * address and length, as returned by the get_entropy() callback. | |
671 | * | |
672 | * GET_NONCE, CLEANUP_NONCE | |
673 | * | |
674 | * Signature and semantics of the get_nonce() and cleanup_nonce() | |
675 | * callbacks are analogous to get_entropy() and cleanup_entropy(). | |
676 | * Currently, the nonce is used only for the known answer tests. | |
12fb8c3d | 677 | */ |
75e2c877 | 678 | int RAND_DRBG_set_callbacks(RAND_DRBG *drbg, |
c16de9d8 DMSP |
679 | RAND_DRBG_get_entropy_fn get_entropy, |
680 | RAND_DRBG_cleanup_entropy_fn cleanup_entropy, | |
681 | RAND_DRBG_get_nonce_fn get_nonce, | |
682 | RAND_DRBG_cleanup_nonce_fn cleanup_nonce) | |
12fb8c3d | 683 | { |
75e2c877 | 684 | if (drbg->state != DRBG_UNINITIALISED) |
12fb8c3d | 685 | return 0; |
c16de9d8 DMSP |
686 | drbg->get_entropy = get_entropy; |
687 | drbg->cleanup_entropy = cleanup_entropy; | |
688 | drbg->get_nonce = get_nonce; | |
689 | drbg->cleanup_nonce = cleanup_nonce; | |
12fb8c3d RS |
690 | return 1; |
691 | } | |
692 | ||
693 | /* | |
75e2c877 | 694 | * Set the reseed interval. |
a93ba405 DMSP |
695 | * |
696 | * The drbg will reseed automatically whenever the number of generate | |
697 | * requests exceeds the given reseed interval. If the reseed interval | |
08a65d96 | 698 | * is 0, then this feature is disabled. |
a93ba405 DMSP |
699 | * |
700 | * Returns 1 on success, 0 on failure. | |
12fb8c3d | 701 | */ |
a93ba405 | 702 | int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval) |
12fb8c3d | 703 | { |
a93ba405 | 704 | if (interval > MAX_RESEED_INTERVAL) |
4c75ee85 | 705 | return 0; |
75e2c877 | 706 | drbg->reseed_interval = interval; |
4c75ee85 | 707 | return 1; |
12fb8c3d RS |
708 | } |
709 | ||
08a65d96 DMSP |
710 | /* |
711 | * Set the reseed time interval. | |
712 | * | |
713 | * The drbg will reseed automatically whenever the time elapsed since | |
714 | * the last reseeding exceeds the given reseed time interval. For safety, | |
715 | * a reseeding will also occur if the clock has been reset to a smaller | |
716 | * value. | |
717 | * | |
718 | * Returns 1 on success, 0 on failure. | |
719 | */ | |
720 | int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval) | |
721 | { | |
722 | if (interval > MAX_RESEED_TIME_INTERVAL) | |
723 | return 0; | |
724 | drbg->reseed_time_interval = interval; | |
725 | return 1; | |
726 | } | |
727 | ||
4917e911 DMSP |
728 | /* |
729 | * Set the default values for reseed (time) intervals of new DRBG instances | |
730 | * | |
731 | * The default values can be set independently for master DRBG instances | |
732 | * (without a parent) and slave DRBG instances (with parent). | |
733 | * | |
734 | * Returns 1 on success, 0 on failure. | |
735 | */ | |
736 | ||
737 | int RAND_DRBG_set_reseed_defaults( | |
738 | unsigned int _master_reseed_interval, | |
739 | unsigned int _slave_reseed_interval, | |
740 | time_t _master_reseed_time_interval, | |
741 | time_t _slave_reseed_time_interval | |
742 | ) | |
743 | { | |
744 | if (_master_reseed_interval > MAX_RESEED_INTERVAL | |
745 | || _slave_reseed_interval > MAX_RESEED_INTERVAL) | |
746 | return 0; | |
747 | ||
748 | if (_master_reseed_time_interval > MAX_RESEED_TIME_INTERVAL | |
749 | || _slave_reseed_time_interval > MAX_RESEED_TIME_INTERVAL) | |
750 | return 0; | |
751 | ||
752 | master_reseed_interval = _master_reseed_interval; | |
753 | slave_reseed_interval = _slave_reseed_interval; | |
754 | ||
755 | master_reseed_time_interval = _master_reseed_time_interval; | |
756 | slave_reseed_time_interval = _slave_reseed_time_interval; | |
757 | ||
758 | return 1; | |
759 | } | |
3ce1c27b DMSP |
760 | |
761 | /* | |
762 | * Locks the given drbg. Locking a drbg which does not have locking | |
763 | * enabled is considered a successful no-op. | |
764 | * | |
765 | * Returns 1 on success, 0 on failure. | |
766 | */ | |
812b1537 | 767 | int rand_drbg_lock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
768 | { |
769 | if (drbg->lock != NULL) | |
770 | return CRYPTO_THREAD_write_lock(drbg->lock); | |
771 | ||
772 | return 1; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Unlocks the given drbg. Unlocking a drbg which does not have locking | |
777 | * enabled is considered a successful no-op. | |
778 | * | |
779 | * Returns 1 on success, 0 on failure. | |
780 | */ | |
812b1537 | 781 | int rand_drbg_unlock(RAND_DRBG *drbg) |
3ce1c27b DMSP |
782 | { |
783 | if (drbg->lock != NULL) | |
784 | return CRYPTO_THREAD_unlock(drbg->lock); | |
785 | ||
786 | return 1; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Enables locking for the given drbg | |
791 | * | |
792 | * Locking can only be enabled if the random generator | |
793 | * is in the uninitialized state. | |
794 | * | |
795 | * Returns 1 on success, 0 on failure. | |
796 | */ | |
812b1537 | 797 | int rand_drbg_enable_locking(RAND_DRBG *drbg) |
3ce1c27b DMSP |
798 | { |
799 | if (drbg->state != DRBG_UNINITIALISED) { | |
800 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
801 | RAND_R_DRBG_ALREADY_INITIALIZED); | |
802 | return 0; | |
803 | } | |
804 | ||
805 | if (drbg->lock == NULL) { | |
4f9dabbf | 806 | if (drbg->parent != NULL && drbg->parent->lock == NULL) { |
3ce1c27b DMSP |
807 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, |
808 | RAND_R_PARENT_LOCKING_NOT_ENABLED); | |
809 | return 0; | |
810 | } | |
811 | ||
812 | drbg->lock = CRYPTO_THREAD_lock_new(); | |
813 | if (drbg->lock == NULL) { | |
814 | RANDerr(RAND_F_RAND_DRBG_ENABLE_LOCKING, | |
815 | RAND_R_FAILED_TO_CREATE_LOCK); | |
816 | return 0; | |
817 | } | |
818 | } | |
819 | ||
820 | return 1; | |
821 | } | |
822 | ||
12fb8c3d RS |
823 | /* |
824 | * Get and set the EXDATA | |
825 | */ | |
75e2c877 RS |
826 | int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg) |
827 | { | |
828 | return CRYPTO_set_ex_data(&drbg->ex_data, idx, arg); | |
829 | } | |
830 | ||
831 | void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx) | |
832 | { | |
833 | return CRYPTO_get_ex_data(&drbg->ex_data, idx); | |
834 | } | |
835 | ||
836 | ||
837 | /* | |
838 | * The following functions provide a RAND_METHOD that works on the | |
839 | * global DRBG. They lock. | |
840 | */ | |
841 | ||
0b14a5b7 | 842 | /* |
933033b6 DMSP |
843 | * Allocates a new global DRBG on the secure heap (if enabled) and |
844 | * initializes it with default settings. | |
a93ba405 DMSP |
845 | * |
846 | * Returns a pointer to the new DRBG instance on success, NULL on failure. | |
0b14a5b7 | 847 | */ |
63ab5ea1 | 848 | static RAND_DRBG *drbg_setup(RAND_DRBG *parent) |
0b14a5b7 | 849 | { |
933033b6 | 850 | RAND_DRBG *drbg; |
0b14a5b7 | 851 | |
8164d91d | 852 | drbg = RAND_DRBG_secure_new(RAND_DRBG_NID, 0, parent); |
933033b6 DMSP |
853 | if (drbg == NULL) |
854 | return NULL; | |
855 | ||
812b1537 | 856 | if (rand_drbg_enable_locking(drbg) == 0) |
933033b6 | 857 | goto err; |
a93ba405 | 858 | |
a93ba405 DMSP |
859 | /* enable seed propagation */ |
860 | drbg->reseed_counter = 1; | |
861 | ||
c16de9d8 DMSP |
862 | /* |
863 | * Ignore instantiation error so support just-in-time instantiation. | |
864 | * | |
865 | * The state of the drbg will be checked in RAND_DRBG_generate() and | |
866 | * an automatic recovery is attempted. | |
867 | */ | |
868 | RAND_DRBG_instantiate(drbg, | |
869 | (const unsigned char *) ossl_pers_string, | |
870 | sizeof(ossl_pers_string) - 1); | |
933033b6 DMSP |
871 | return drbg; |
872 | ||
873 | err: | |
4f9dabbf | 874 | RAND_DRBG_free(drbg); |
933033b6 | 875 | return NULL; |
0b14a5b7 KR |
876 | } |
877 | ||
878 | /* | |
879 | * Initialize the global DRBGs on first use. | |
880 | * Returns 1 on success, 0 on failure. | |
881 | */ | |
c16de9d8 | 882 | DEFINE_RUN_ONCE_STATIC(do_rand_drbg_init) |
0b14a5b7 | 883 | { |
39571fca DMSP |
884 | /* |
885 | * ensure that libcrypto is initialized, otherwise the | |
886 | * DRBG locks are not cleaned up properly | |
887 | */ | |
888 | if (!OPENSSL_init_crypto(0, NULL)) | |
889 | return 0; | |
890 | ||
63ab5ea1 BK |
891 | drbg_master = drbg_setup(NULL); |
892 | drbg_public = drbg_setup(drbg_master); | |
893 | drbg_private = drbg_setup(drbg_master); | |
0b14a5b7 | 894 | |
933033b6 DMSP |
895 | if (drbg_master == NULL || drbg_public == NULL || drbg_private == NULL) |
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 | { |
4f9dabbf DMSP |
904 | RAND_DRBG_free(drbg_private); |
905 | RAND_DRBG_free(drbg_public); | |
906 | RAND_DRBG_free(drbg_master); | |
933033b6 DMSP |
907 | |
908 | drbg_private = drbg_public = drbg_master = NULL; | |
0b14a5b7 KR |
909 | } |
910 | ||
c16de9d8 | 911 | /* Implements the default OpenSSL RAND_bytes() method */ |
75e2c877 RS |
912 | static int drbg_bytes(unsigned char *out, int count) |
913 | { | |
f61f62ea | 914 | int ret; |
a93ba405 | 915 | RAND_DRBG *drbg = RAND_DRBG_get0_public(); |
75e2c877 | 916 | |
0b14a5b7 KR |
917 | if (drbg == NULL) |
918 | return 0; | |
919 | ||
812b1537 | 920 | rand_drbg_lock(drbg); |
f61f62ea | 921 | ret = RAND_DRBG_bytes(drbg, out, count); |
812b1537 | 922 | rand_drbg_unlock(drbg); |
f61f62ea | 923 | |
75e2c877 RS |
924 | return ret; |
925 | } | |
926 | ||
c16de9d8 | 927 | /* Implements the default OpenSSL RAND_add() method */ |
75e2c877 RS |
928 | static int drbg_add(const void *buf, int num, double randomness) |
929 | { | |
c16de9d8 | 930 | int ret = 0; |
a93ba405 | 931 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
75e2c877 | 932 | |
c16de9d8 DMSP |
933 | if (drbg == NULL) |
934 | return 0; | |
75e2c877 | 935 | |
c16de9d8 DMSP |
936 | if (num < 0 || randomness < 0.0) |
937 | return 0; | |
75e2c877 | 938 | |
c16de9d8 DMSP |
939 | if (randomness > (double)drbg->max_entropylen) { |
940 | /* | |
941 | * The purpose of this check is to bound |randomness| by a | |
942 | * relatively small value in order to prevent an integer | |
943 | * overflow when multiplying by 8 in the rand_drbg_restart() | |
944 | * call below. | |
945 | */ | |
946 | return 0; | |
75e2c877 RS |
947 | } |
948 | ||
812b1537 | 949 | rand_drbg_lock(drbg); |
c16de9d8 DMSP |
950 | ret = rand_drbg_restart(drbg, buf, |
951 | (size_t)(unsigned int)num, | |
952 | (size_t)(8*randomness)); | |
812b1537 | 953 | rand_drbg_unlock(drbg); |
c16de9d8 DMSP |
954 | |
955 | return ret; | |
75e2c877 RS |
956 | } |
957 | ||
c16de9d8 | 958 | /* Implements the default OpenSSL RAND_seed() method */ |
75e2c877 RS |
959 | static int drbg_seed(const void *buf, int num) |
960 | { | |
961 | return drbg_add(buf, num, num); | |
962 | } | |
963 | ||
c16de9d8 | 964 | /* Implements the default OpenSSL RAND_status() method */ |
75e2c877 | 965 | static int drbg_status(void) |
12fb8c3d | 966 | { |
75e2c877 | 967 | int ret; |
a93ba405 | 968 | RAND_DRBG *drbg = RAND_DRBG_get0_master(); |
0b14a5b7 KR |
969 | |
970 | if (drbg == NULL) | |
971 | return 0; | |
75e2c877 | 972 | |
812b1537 | 973 | rand_drbg_lock(drbg); |
0b14a5b7 | 974 | ret = drbg->state == DRBG_READY ? 1 : 0; |
812b1537 | 975 | rand_drbg_unlock(drbg); |
75e2c877 | 976 | return ret; |
12fb8c3d RS |
977 | } |
978 | ||
0b14a5b7 | 979 | /* |
a93ba405 DMSP |
980 | * Get the master DRBG. |
981 | * Returns pointer to the DRBG on success, NULL on failure. | |
982 | * | |
983 | */ | |
984 | RAND_DRBG *RAND_DRBG_get0_master(void) | |
985 | { | |
986 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) | |
987 | return NULL; | |
988 | ||
933033b6 | 989 | return drbg_master; |
a93ba405 DMSP |
990 | } |
991 | ||
992 | /* | |
993 | * Get the public DRBG. | |
0b14a5b7 KR |
994 | * Returns pointer to the DRBG on success, NULL on failure. |
995 | */ | |
a93ba405 | 996 | RAND_DRBG *RAND_DRBG_get0_public(void) |
0b14a5b7 | 997 | { |
c16de9d8 | 998 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
999 | return NULL; |
1000 | ||
933033b6 | 1001 | return drbg_public; |
0b14a5b7 KR |
1002 | } |
1003 | ||
1004 | /* | |
a93ba405 | 1005 | * Get the private DRBG. |
0b14a5b7 KR |
1006 | * Returns pointer to the DRBG on success, NULL on failure. |
1007 | */ | |
a93ba405 | 1008 | RAND_DRBG *RAND_DRBG_get0_private(void) |
0b14a5b7 | 1009 | { |
c16de9d8 | 1010 | if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) |
0b14a5b7 KR |
1011 | return NULL; |
1012 | ||
933033b6 | 1013 | return drbg_private; |
0b14a5b7 KR |
1014 | } |
1015 | ||
75e2c877 RS |
1016 | RAND_METHOD rand_meth = { |
1017 | drbg_seed, | |
1018 | drbg_bytes, | |
ddc6a5c8 | 1019 | NULL, |
75e2c877 RS |
1020 | drbg_add, |
1021 | drbg_bytes, | |
1022 | drbg_status | |
1023 | }; | |
1024 | ||
1025 | RAND_METHOD *RAND_OpenSSL(void) | |
12fb8c3d | 1026 | { |
75e2c877 | 1027 | return &rand_meth; |
12fb8c3d | 1028 | } |