2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/core_names.h>
11 #include "internal/cryptlib.h"
12 #include "internal/nelem.h"
13 #include "crypto/evp.h"
14 #include "crypto/asn1.h"
15 #include "internal/core.h"
16 #include "internal/provider.h"
17 #include "evp_local.h"
20 * match_type() checks if two EVP_KEYMGMT are matching key types. This
21 * function assumes that the caller has made all the necessary NULL checks.
23 static int match_type(const EVP_KEYMGMT *keymgmt1, const EVP_KEYMGMT *keymgmt2)
25 const char *name2 = EVP_KEYMGMT_get0_name(keymgmt2);
27 return EVP_KEYMGMT_is_a(keymgmt1, name2);
30 int evp_keymgmt_util_try_import(const OSSL_PARAM params[], void *arg)
32 struct evp_keymgmt_util_try_import_data_st *data = arg;
33 int delete_on_error = 0;
35 /* Just in time creation of keydata */
36 if (data->keydata == NULL) {
37 if ((data->keydata = evp_keymgmt_newdata(data->keymgmt)) == NULL) {
38 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
45 * It's fine if there was no data to transfer, we just end up with an
46 * empty destination key.
48 if (params[0].key == NULL)
51 if (evp_keymgmt_import(data->keymgmt, data->keydata, data->selection,
54 if (delete_on_error) {
55 evp_keymgmt_freedata(data->keymgmt, data->keydata);
61 int evp_keymgmt_util_assign_pkey(EVP_PKEY *pkey, EVP_KEYMGMT *keymgmt,
64 if (pkey == NULL || keymgmt == NULL || keydata == NULL
65 || !EVP_PKEY_set_type_by_keymgmt(pkey, keymgmt)) {
66 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
69 pkey->keydata = keydata;
70 evp_keymgmt_util_cache_keyinfo(pkey);
74 EVP_PKEY *evp_keymgmt_util_make_pkey(EVP_KEYMGMT *keymgmt, void *keydata)
76 EVP_PKEY *pkey = NULL;
80 || (pkey = EVP_PKEY_new()) == NULL
81 || !evp_keymgmt_util_assign_pkey(pkey, keymgmt, keydata)) {
88 int evp_keymgmt_util_export(const EVP_PKEY *pk, int selection,
89 OSSL_CALLBACK *export_cb, void *export_cbarg)
91 if (pk == NULL || export_cb == NULL)
93 return evp_keymgmt_export(pk->keymgmt, pk->keydata, selection,
94 export_cb, export_cbarg);
97 void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt)
99 struct evp_keymgmt_util_try_import_data_st import_data;
102 /* Export to where? */
106 /* If we have an unassigned key, give up */
107 if (pk->keydata == NULL)
111 * If |keymgmt| matches the "origin" |keymgmt|, there is no more to do.
112 * The "origin" is determined by the |keymgmt| pointers being identical
113 * or when the provider and the name ID match. The latter case handles the
114 * situation where the fetch cache is flushed and a "new" key manager is
117 if (pk->keymgmt == keymgmt
118 || (pk->keymgmt->name_id == keymgmt->name_id
119 && pk->keymgmt->prov == keymgmt->prov))
122 if (!CRYPTO_THREAD_read_lock(pk->lock))
125 * If the provider native "origin" hasn't changed since last time, we
126 * try to find our keymgmt in the operation cache. If it has changed
127 * and our keymgmt isn't found, we will clear the cache further down.
129 if (pk->dirty_cnt == pk->dirty_cnt_copy) {
130 /* If this key is already exported to |keymgmt|, no more to do */
131 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
132 if (op != NULL && op->keymgmt != NULL) {
133 void *ret = op->keydata;
135 CRYPTO_THREAD_unlock(pk->lock);
139 CRYPTO_THREAD_unlock(pk->lock);
141 /* If the "origin" |keymgmt| doesn't support exporting, give up */
142 if (pk->keymgmt->export == NULL)
146 * Make sure that the type of the keymgmt to export to matches the type
149 if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
153 * We look at the already cached provider keys, and import from the
154 * first that supports it (i.e. use its export function), and export
155 * the imported data to the new provider.
158 /* Setup for the export callback */
159 import_data.keydata = NULL; /* evp_keymgmt_util_try_import will create it */
160 import_data.keymgmt = keymgmt;
161 import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
164 * The export function calls the callback (evp_keymgmt_util_try_import),
165 * which does the import for us. If successful, we're done.
167 if (!evp_keymgmt_util_export(pk, OSSL_KEYMGMT_SELECT_ALL,
168 &evp_keymgmt_util_try_import, &import_data))
169 /* If there was an error, bail out */
172 if (!CRYPTO_THREAD_write_lock(pk->lock)) {
173 evp_keymgmt_freedata(keymgmt, import_data.keydata);
176 /* Check to make sure some other thread didn't get there first */
177 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
178 if (op != NULL && op->keydata != NULL) {
179 void *ret = op->keydata;
181 CRYPTO_THREAD_unlock(pk->lock);
184 * Another thread seemms to have already exported this so we abandon
185 * all the work we just did.
187 evp_keymgmt_freedata(keymgmt, import_data.keydata);
193 * If the dirty counter changed since last time, then clear the
194 * operation cache. In that case, we know that |i| is zero.
196 if (pk->dirty_cnt != pk->dirty_cnt_copy)
197 evp_keymgmt_util_clear_operation_cache(pk, 0);
199 /* Add the new export to the operation cache */
200 if (!evp_keymgmt_util_cache_keydata(pk, keymgmt, import_data.keydata)) {
201 evp_keymgmt_freedata(keymgmt, import_data.keydata);
205 /* Synchronize the dirty count */
206 pk->dirty_cnt_copy = pk->dirty_cnt;
208 CRYPTO_THREAD_unlock(pk->lock);
210 return import_data.keydata;
213 static void op_cache_free(OP_CACHE_ELEM *e)
215 evp_keymgmt_freedata(e->keymgmt, e->keydata);
216 EVP_KEYMGMT_free(e->keymgmt);
220 int evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk, int locking)
223 if (locking && pk->lock != NULL && !CRYPTO_THREAD_write_lock(pk->lock))
225 sk_OP_CACHE_ELEM_pop_free(pk->operation_cache, op_cache_free);
226 pk->operation_cache = NULL;
227 if (locking && pk->lock != NULL)
228 CRYPTO_THREAD_unlock(pk->lock);
234 OP_CACHE_ELEM *evp_keymgmt_util_find_operation_cache(EVP_PKEY *pk,
235 EVP_KEYMGMT *keymgmt)
237 int i, end = sk_OP_CACHE_ELEM_num(pk->operation_cache);
241 * A comparison and sk_P_CACHE_ELEM_find() are avoided to not cause
242 * problems when we've only a read lock.
244 for (i = 0; i < end; i++) {
245 p = sk_OP_CACHE_ELEM_value(pk->operation_cache, i);
246 if (keymgmt == p->keymgmt)
252 int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk,
253 EVP_KEYMGMT *keymgmt, void *keydata)
255 OP_CACHE_ELEM *p = NULL;
257 if (keydata != NULL) {
258 if (pk->operation_cache == NULL) {
259 pk->operation_cache = sk_OP_CACHE_ELEM_new_null();
260 if (pk->operation_cache == NULL)
264 p = OPENSSL_malloc(sizeof(*p));
267 p->keydata = keydata;
268 p->keymgmt = keymgmt;
270 if (!EVP_KEYMGMT_up_ref(keymgmt)) {
275 if (!sk_OP_CACHE_ELEM_push(pk->operation_cache, p)) {
276 EVP_KEYMGMT_free(keymgmt);
284 void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
287 * Cache information about the provider "origin" key.
289 * This services functions like EVP_PKEY_get_size, EVP_PKEY_get_bits, etc
291 if (pk->keydata != NULL) {
293 int security_bits = 0;
295 OSSL_PARAM params[4];
297 params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
298 params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
300 params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
301 params[3] = OSSL_PARAM_construct_end();
302 if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
303 pk->cache.size = size;
304 pk->cache.bits = bits;
305 pk->cache.security_bits = security_bits;
310 void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
311 int selection, const OSSL_PARAM params[])
313 void *keydata = NULL;
315 if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
316 || !evp_keymgmt_import(keymgmt, keydata, selection, params)
317 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
318 evp_keymgmt_freedata(keymgmt, keydata);
324 int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
326 /* Check if key is even assigned */
327 if (pk->keymgmt == NULL)
330 return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
334 * evp_keymgmt_util_match() doesn't just look at the provider side "origin",
335 * but also in the operation cache to see if there's any common keymgmt that
336 * supplies OP_keymgmt_match.
338 * evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_eq()
339 * and EVP_PKEY_parameters_eq() return, i.e.:
343 * -1 not same key type
344 * -2 unsupported operation
346 int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
348 EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
349 void *keydata1 = NULL, *keydata2 = NULL;
351 if (pk1 == NULL || pk2 == NULL) {
352 if (pk1 == NULL && pk2 == NULL)
357 keymgmt1 = pk1->keymgmt;
358 keydata1 = pk1->keydata;
359 keymgmt2 = pk2->keymgmt;
360 keydata2 = pk2->keydata;
362 if (keymgmt1 != keymgmt2) {
364 * The condition for a successful cross export is that the
365 * keydata to be exported is NULL (typed, but otherwise empty
366 * EVP_PKEY), or that it was possible to export it with
367 * evp_keymgmt_util_export_to_provider().
369 * We use |ok| to determine if it's ok to cross export one way,
370 * but also to determine if we should attempt a cross export
371 * the other way. There's no point doing it both ways.
375 /* Complex case, where the keymgmt differ */
378 && !match_type(keymgmt1, keymgmt2)) {
379 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
380 return -1; /* Not the same type */
384 * The key types are determined to match, so we try cross export,
385 * but only to keymgmt's that supply a matching function.
388 && keymgmt2->match != NULL) {
389 void *tmp_keydata = NULL;
392 if (keydata1 != NULL) {
394 evp_keymgmt_util_export_to_provider(pk1, keymgmt2);
395 ok = (tmp_keydata != NULL);
399 keydata1 = tmp_keydata;
403 * If we've successfully cross exported one way, there's no point
404 * doing it the other way, hence the |!ok| check.
408 && keymgmt1->match != NULL) {
409 void *tmp_keydata = NULL;
412 if (keydata2 != NULL) {
414 evp_keymgmt_util_export_to_provider(pk2, keymgmt1);
415 ok = (tmp_keydata != NULL);
419 keydata2 = tmp_keydata;
424 /* If we still don't have matching keymgmt implementations, we give up */
425 if (keymgmt1 != keymgmt2)
428 /* If both keydata are NULL, then they're the same key */
429 if (keydata1 == NULL && keydata2 == NULL)
431 /* If only one of the keydata is NULL, then they're different keys */
432 if (keydata1 == NULL || keydata2 == NULL)
434 /* If both keydata are non-NULL, we let the backend decide */
435 return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
438 int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
440 /* Save copies of pointers we want to play with without affecting |to| */
441 EVP_KEYMGMT *to_keymgmt = to->keymgmt;
442 void *to_keydata = to->keydata, *alloc_keydata = NULL;
444 /* An unassigned key can't be copied */
445 if (from == NULL || from->keydata == NULL)
449 * If |to| is unassigned, ensure it gets the same KEYMGMT as |from|,
450 * Note that the final setting of KEYMGMT is done further down, with
451 * EVP_PKEY_set_type_by_keymgmt(); we don't want to do that prematurely.
453 if (to_keymgmt == NULL)
454 to_keymgmt = from->keymgmt;
456 if (to_keymgmt == from->keymgmt && to_keymgmt->dup != NULL
457 && to_keydata == NULL) {
458 to_keydata = alloc_keydata = evp_keymgmt_dup(to_keymgmt,
461 if (to_keydata == NULL)
463 } else if (match_type(to_keymgmt, from->keymgmt)) {
464 struct evp_keymgmt_util_try_import_data_st import_data;
466 import_data.keymgmt = to_keymgmt;
467 import_data.keydata = to_keydata;
468 import_data.selection = selection;
470 if (!evp_keymgmt_util_export(from, selection,
471 &evp_keymgmt_util_try_import,
476 * In case to_keydata was previously unallocated,
477 * evp_keymgmt_util_try_import() may have created it for us.
479 if (to_keydata == NULL)
480 to_keydata = alloc_keydata = import_data.keydata;
482 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
487 * We only need to set the |to| type when its |keymgmt| isn't set.
488 * We can then just set its |keydata| to what we have, which might
489 * be exactly what it had when entering this function.
490 * This is a bit different from using evp_keymgmt_util_assign_pkey(),
491 * which isn't as careful with |to|'s original |keymgmt|, since it's
492 * meant to forcibly reassign an EVP_PKEY no matter what, which is
493 * why we don't use that one here.
495 if (to->keymgmt == NULL
496 && !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
497 evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
500 to->keydata = to_keydata;
501 evp_keymgmt_util_cache_keyinfo(to);
506 void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
507 void *genctx, OSSL_CALLBACK *cb, void *cbarg)
509 void *keydata = NULL;
511 if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
512 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
513 evp_keymgmt_freedata(keymgmt, keydata);
521 * Returns the same numbers as EVP_PKEY_get_default_digest_name()
522 * When the string from the EVP_KEYMGMT implementation is "", we use
523 * SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
524 * returns for no digest.
526 int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
528 char *mdname, size_t mdname_sz)
530 OSSL_PARAM params[3];
531 char mddefault[100] = "";
532 char mdmandatory[100] = "";
537 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
538 mddefault, sizeof(mddefault));
540 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
542 sizeof(mdmandatory));
543 params[2] = OSSL_PARAM_construct_end();
545 if (!evp_keymgmt_get_params(keymgmt, keydata, params))
548 if (OSSL_PARAM_modified(params + 1)) {
549 if (params[1].return_size <= 1) /* Only a NUL byte */
552 result = mdmandatory;
554 } else if (OSSL_PARAM_modified(params)) {
555 if (params[0].return_size <= 1) /* Only a NUL byte */
562 OPENSSL_strlcpy(mdname, result, mdname_sz);