1 /*
2 * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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 <stdio.h>
11 #include <stdlib.h>
12 #include <openssl/objects.h>
13 #include <openssl/evp.h>
14 #include "internal/cryptlib.h"
15 #include "internal/provider.h"
16 #include "internal/core.h"
17 #include "crypto/evp.h"
18 #include "evp_local.h"
19
evp_pkey_asym_cipher_init(EVP_PKEY_CTX * ctx,int operation,const OSSL_PARAM params[])20 static int evp_pkey_asym_cipher_init(EVP_PKEY_CTX *ctx, int operation,
21 const OSSL_PARAM params[])
22 {
23 int ret = 0;
24 void *provkey = NULL;
25 EVP_ASYM_CIPHER *cipher = NULL;
26 EVP_KEYMGMT *tmp_keymgmt = NULL;
27 const OSSL_PROVIDER *tmp_prov = NULL;
28 const char *supported_ciph = NULL;
29 int iter;
30
31 if (ctx == NULL) {
32 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
33 return -2;
34 }
35
36 evp_pkey_ctx_free_old_ops(ctx);
37 ctx->operation = operation;
38
39 ERR_set_mark();
40
41 if (evp_pkey_ctx_is_legacy(ctx))
42 goto legacy;
43
44 if (ctx->pkey == NULL) {
45 ERR_clear_last_mark();
46 ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
47 goto err;
48 }
49
50 /*
51 * Try to derive the supported asym cipher from |ctx->keymgmt|.
52 */
53 if (!ossl_assert(ctx->pkey->keymgmt == NULL
54 || ctx->pkey->keymgmt == ctx->keymgmt)) {
55 ERR_clear_last_mark();
56 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
57 goto err;
58 }
59 supported_ciph
60 = evp_keymgmt_util_query_operation_name(ctx->keymgmt,
61 OSSL_OP_ASYM_CIPHER);
62 if (supported_ciph == NULL) {
63 ERR_clear_last_mark();
64 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
65 goto err;
66 }
67
68 /*
69 * We perform two iterations:
70 *
71 * 1. Do the normal asym cipher fetch, using the fetching data given by
72 * the EVP_PKEY_CTX.
73 * 2. Do the provider specific asym cipher fetch, from the same provider
74 * as |ctx->keymgmt|
75 *
76 * We then try to fetch the keymgmt from the same provider as the
77 * asym cipher, and try to export |ctx->pkey| to that keymgmt (when
78 * this keymgmt happens to be the same as |ctx->keymgmt|, the export
79 * is a no-op, but we call it anyway to not complicate the code even
80 * more).
81 * If the export call succeeds (returns a non-NULL provider key pointer),
82 * we're done and can perform the operation itself. If not, we perform
83 * the second iteration, or jump to legacy.
84 */
85 for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) {
86 EVP_KEYMGMT *tmp_keymgmt_tofree;
87
88 /*
89 * If we're on the second iteration, free the results from the first.
90 * They are NULL on the first iteration, so no need to check what
91 * iteration we're on.
92 */
93 EVP_ASYM_CIPHER_free(cipher);
94 EVP_KEYMGMT_free(tmp_keymgmt);
95
96 switch (iter) {
97 case 1:
98 cipher = EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph,
99 ctx->propquery);
100 if (cipher != NULL)
101 tmp_prov = EVP_ASYM_CIPHER_get0_provider(cipher);
102 break;
103 case 2:
104 tmp_prov = EVP_KEYMGMT_get0_provider(ctx->keymgmt);
105 cipher =
106 evp_asym_cipher_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
107 supported_ciph, ctx->propquery);
108 if (cipher == NULL)
109 goto legacy;
110 break;
111 }
112 if (cipher == NULL)
113 continue;
114
115 /*
116 * Ensure that the key is provided, either natively, or as a cached
117 * export. We start by fetching the keymgmt with the same name as
118 * |ctx->pkey|, but from the provider of the asym cipher method, using
119 * the same property query as when fetching the asym cipher method.
120 * With the keymgmt we found (if we did), we try to export |ctx->pkey|
121 * to it (evp_pkey_export_to_provider() is smart enough to only actually
122 * export it if |tmp_keymgmt| is different from |ctx->pkey|'s keymgmt)
123 */
124 tmp_keymgmt_tofree = tmp_keymgmt
125 = evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
126 EVP_KEYMGMT_get0_name(ctx->keymgmt),
127 ctx->propquery);
128 if (tmp_keymgmt != NULL)
129 provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
130 &tmp_keymgmt, ctx->propquery);
131 if (tmp_keymgmt == NULL)
132 EVP_KEYMGMT_free(tmp_keymgmt_tofree);
133 }
134
135 if (provkey == NULL) {
136 EVP_ASYM_CIPHER_free(cipher);
137 goto legacy;
138 }
139
140 ERR_pop_to_mark();
141
142 /* No more legacy from here down to legacy: */
143
144 ctx->op.ciph.cipher = cipher;
145 ctx->op.ciph.algctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
146 if (ctx->op.ciph.algctx == NULL) {
147 /* The provider key can stay in the cache */
148 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
149 goto err;
150 }
151
152 switch (operation) {
153 case EVP_PKEY_OP_ENCRYPT:
154 if (cipher->encrypt_init == NULL) {
155 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
156 ret = -2;
157 goto err;
158 }
159 ret = cipher->encrypt_init(ctx->op.ciph.algctx, provkey, params);
160 break;
161 case EVP_PKEY_OP_DECRYPT:
162 if (cipher->decrypt_init == NULL) {
163 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
164 ret = -2;
165 goto err;
166 }
167 ret = cipher->decrypt_init(ctx->op.ciph.algctx, provkey, params);
168 break;
169 default:
170 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
171 goto err;
172 }
173
174 if (ret <= 0)
175 goto err;
176 EVP_KEYMGMT_free(tmp_keymgmt);
177 return 1;
178
179 legacy:
180 /*
181 * If we don't have the full support we need with provided methods,
182 * let's go see if legacy does.
183 */
184 ERR_pop_to_mark();
185 EVP_KEYMGMT_free(tmp_keymgmt);
186 tmp_keymgmt = NULL;
187
188 if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
189 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
190 return -2;
191 }
192 switch(ctx->operation) {
193 case EVP_PKEY_OP_ENCRYPT:
194 if (ctx->pmeth->encrypt_init == NULL)
195 return 1;
196 ret = ctx->pmeth->encrypt_init(ctx);
197 break;
198 case EVP_PKEY_OP_DECRYPT:
199 if (ctx->pmeth->decrypt_init == NULL)
200 return 1;
201 ret = ctx->pmeth->decrypt_init(ctx);
202 break;
203 default:
204 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
205 ret = -1;
206 }
207
208 err:
209 if (ret <= 0) {
210 evp_pkey_ctx_free_old_ops(ctx);
211 ctx->operation = EVP_PKEY_OP_UNDEFINED;
212 }
213 EVP_KEYMGMT_free(tmp_keymgmt);
214 return ret;
215 }
216
EVP_PKEY_encrypt_init(EVP_PKEY_CTX * ctx)217 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
218 {
219 return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT, NULL);
220 }
221
EVP_PKEY_encrypt_init_ex(EVP_PKEY_CTX * ctx,const OSSL_PARAM params[])222 int EVP_PKEY_encrypt_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
223 {
224 return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT, params);
225 }
226
EVP_PKEY_encrypt(EVP_PKEY_CTX * ctx,unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen)227 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
228 unsigned char *out, size_t *outlen,
229 const unsigned char *in, size_t inlen)
230 {
231 int ret;
232
233 if (ctx == NULL) {
234 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
235 return -2;
236 }
237
238 if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
239 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
240 return -1;
241 }
242
243 if (ctx->op.ciph.algctx == NULL)
244 goto legacy;
245
246 ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.algctx, out, outlen,
247 (out == NULL ? 0 : *outlen), in, inlen);
248 return ret;
249
250 legacy:
251 if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
252 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
253 return -2;
254 }
255 M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
256 return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
257 }
258
EVP_PKEY_decrypt_init(EVP_PKEY_CTX * ctx)259 int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
260 {
261 return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT, NULL);
262 }
263
EVP_PKEY_decrypt_init_ex(EVP_PKEY_CTX * ctx,const OSSL_PARAM params[])264 int EVP_PKEY_decrypt_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
265 {
266 return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT, params);
267 }
268
EVP_PKEY_decrypt(EVP_PKEY_CTX * ctx,unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen)269 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
270 unsigned char *out, size_t *outlen,
271 const unsigned char *in, size_t inlen)
272 {
273 int ret;
274
275 if (ctx == NULL) {
276 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
277 return -2;
278 }
279
280 if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
281 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
282 return -1;
283 }
284
285 if (ctx->op.ciph.algctx == NULL)
286 goto legacy;
287
288 ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.algctx, out, outlen,
289 (out == NULL ? 0 : *outlen), in, inlen);
290 return ret;
291
292 legacy:
293 if (ctx->pmeth == NULL || ctx->pmeth->decrypt == NULL) {
294 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
295 return -2;
296 }
297 M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
298 return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
299 }
300
301
evp_asym_cipher_new(OSSL_PROVIDER * prov)302 static EVP_ASYM_CIPHER *evp_asym_cipher_new(OSSL_PROVIDER *prov)
303 {
304 EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));
305
306 if (cipher == NULL) {
307 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
308 return NULL;
309 }
310
311 cipher->lock = CRYPTO_THREAD_lock_new();
312 if (cipher->lock == NULL) {
313 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
314 OPENSSL_free(cipher);
315 return NULL;
316 }
317 cipher->prov = prov;
318 ossl_provider_up_ref(prov);
319 cipher->refcnt = 1;
320
321 return cipher;
322 }
323
evp_asym_cipher_from_algorithm(int name_id,const OSSL_ALGORITHM * algodef,OSSL_PROVIDER * prov)324 static void *evp_asym_cipher_from_algorithm(int name_id,
325 const OSSL_ALGORITHM *algodef,
326 OSSL_PROVIDER *prov)
327 {
328 const OSSL_DISPATCH *fns = algodef->implementation;
329 EVP_ASYM_CIPHER *cipher = NULL;
330 int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
331 int gparamfncnt = 0, sparamfncnt = 0;
332
333 if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
334 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
335 goto err;
336 }
337
338 cipher->name_id = name_id;
339 if ((cipher->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
340 goto err;
341 cipher->description = algodef->algorithm_description;
342
343 for (; fns->function_id != 0; fns++) {
344 switch (fns->function_id) {
345 case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
346 if (cipher->newctx != NULL)
347 break;
348 cipher->newctx = OSSL_FUNC_asym_cipher_newctx(fns);
349 ctxfncnt++;
350 break;
351 case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
352 if (cipher->encrypt_init != NULL)
353 break;
354 cipher->encrypt_init = OSSL_FUNC_asym_cipher_encrypt_init(fns);
355 encfncnt++;
356 break;
357 case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
358 if (cipher->encrypt != NULL)
359 break;
360 cipher->encrypt = OSSL_FUNC_asym_cipher_encrypt(fns);
361 encfncnt++;
362 break;
363 case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
364 if (cipher->decrypt_init != NULL)
365 break;
366 cipher->decrypt_init = OSSL_FUNC_asym_cipher_decrypt_init(fns);
367 decfncnt++;
368 break;
369 case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
370 if (cipher->decrypt != NULL)
371 break;
372 cipher->decrypt = OSSL_FUNC_asym_cipher_decrypt(fns);
373 decfncnt++;
374 break;
375 case OSSL_FUNC_ASYM_CIPHER_FREECTX:
376 if (cipher->freectx != NULL)
377 break;
378 cipher->freectx = OSSL_FUNC_asym_cipher_freectx(fns);
379 ctxfncnt++;
380 break;
381 case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
382 if (cipher->dupctx != NULL)
383 break;
384 cipher->dupctx = OSSL_FUNC_asym_cipher_dupctx(fns);
385 break;
386 case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
387 if (cipher->get_ctx_params != NULL)
388 break;
389 cipher->get_ctx_params
390 = OSSL_FUNC_asym_cipher_get_ctx_params(fns);
391 gparamfncnt++;
392 break;
393 case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
394 if (cipher->gettable_ctx_params != NULL)
395 break;
396 cipher->gettable_ctx_params
397 = OSSL_FUNC_asym_cipher_gettable_ctx_params(fns);
398 gparamfncnt++;
399 break;
400 case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
401 if (cipher->set_ctx_params != NULL)
402 break;
403 cipher->set_ctx_params
404 = OSSL_FUNC_asym_cipher_set_ctx_params(fns);
405 sparamfncnt++;
406 break;
407 case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
408 if (cipher->settable_ctx_params != NULL)
409 break;
410 cipher->settable_ctx_params
411 = OSSL_FUNC_asym_cipher_settable_ctx_params(fns);
412 sparamfncnt++;
413 break;
414 }
415 }
416 if (ctxfncnt != 2
417 || (encfncnt != 0 && encfncnt != 2)
418 || (decfncnt != 0 && decfncnt != 2)
419 || (encfncnt != 2 && decfncnt != 2)
420 || (gparamfncnt != 0 && gparamfncnt != 2)
421 || (sparamfncnt != 0 && sparamfncnt != 2)) {
422 /*
423 * In order to be a consistent set of functions we must have at least
424 * a set of context functions (newctx and freectx) as well as a pair of
425 * "cipher" functions: (encrypt_init, encrypt) or
426 * (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
427 * optional, but if one of them is present then the other one must also
428 * be present. The same applies to get_ctx_params and
429 * gettable_ctx_params. The dupctx function is optional.
430 */
431 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
432 goto err;
433 }
434
435 return cipher;
436 err:
437 EVP_ASYM_CIPHER_free(cipher);
438 return NULL;
439 }
440
EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER * cipher)441 void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
442 {
443 int i;
444
445 if (cipher == NULL)
446 return;
447 CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
448 if (i > 0)
449 return;
450 OPENSSL_free(cipher->type_name);
451 ossl_provider_free(cipher->prov);
452 CRYPTO_THREAD_lock_free(cipher->lock);
453 OPENSSL_free(cipher);
454 }
455
EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER * cipher)456 int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
457 {
458 int ref = 0;
459
460 CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
461 return 1;
462 }
463
EVP_ASYM_CIPHER_get0_provider(const EVP_ASYM_CIPHER * cipher)464 OSSL_PROVIDER *EVP_ASYM_CIPHER_get0_provider(const EVP_ASYM_CIPHER *cipher)
465 {
466 return cipher->prov;
467 }
468
EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX * ctx,const char * algorithm,const char * properties)469 EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
470 const char *properties)
471 {
472 return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
473 evp_asym_cipher_from_algorithm,
474 (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
475 (void (*)(void *))EVP_ASYM_CIPHER_free);
476 }
477
evp_asym_cipher_fetch_from_prov(OSSL_PROVIDER * prov,const char * algorithm,const char * properties)478 EVP_ASYM_CIPHER *evp_asym_cipher_fetch_from_prov(OSSL_PROVIDER *prov,
479 const char *algorithm,
480 const char *properties)
481 {
482 return evp_generic_fetch_from_prov(prov, OSSL_OP_ASYM_CIPHER,
483 algorithm, properties,
484 evp_asym_cipher_from_algorithm,
485 (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
486 (void (*)(void *))EVP_ASYM_CIPHER_free);
487 }
488
EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER * cipher,const char * name)489 int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name)
490 {
491 return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
492 }
493
evp_asym_cipher_get_number(const EVP_ASYM_CIPHER * cipher)494 int evp_asym_cipher_get_number(const EVP_ASYM_CIPHER *cipher)
495 {
496 return cipher->name_id;
497 }
498
EVP_ASYM_CIPHER_get0_name(const EVP_ASYM_CIPHER * cipher)499 const char *EVP_ASYM_CIPHER_get0_name(const EVP_ASYM_CIPHER *cipher)
500 {
501 return cipher->type_name;
502 }
503
EVP_ASYM_CIPHER_get0_description(const EVP_ASYM_CIPHER * cipher)504 const char *EVP_ASYM_CIPHER_get0_description(const EVP_ASYM_CIPHER *cipher)
505 {
506 return cipher->description;
507 }
508
EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX * libctx,void (* fn)(EVP_ASYM_CIPHER * cipher,void * arg),void * arg)509 void EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
510 void (*fn)(EVP_ASYM_CIPHER *cipher,
511 void *arg),
512 void *arg)
513 {
514 evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
515 (void (*)(void *, void *))fn, arg,
516 evp_asym_cipher_from_algorithm,
517 (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
518 (void (*)(void *))EVP_ASYM_CIPHER_free);
519 }
520
521
EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER * cipher,void (* fn)(const char * name,void * data),void * data)522 int EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
523 void (*fn)(const char *name, void *data),
524 void *data)
525 {
526 if (cipher->prov != NULL)
527 return evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
528
529 return 1;
530 }
531
EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER * cip)532 const OSSL_PARAM *EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER *cip)
533 {
534 void *provctx;
535
536 if (cip == NULL || cip->gettable_ctx_params == NULL)
537 return NULL;
538
539 provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_get0_provider(cip));
540 return cip->gettable_ctx_params(NULL, provctx);
541 }
542
EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER * cip)543 const OSSL_PARAM *EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER *cip)
544 {
545 void *provctx;
546
547 if (cip == NULL || cip->settable_ctx_params == NULL)
548 return NULL;
549
550 provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_get0_provider(cip));
551 return cip->settable_ctx_params(NULL, provctx);
552 }
553