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 OSSL_PROVIDER *prov2 = EVP_KEYMGMT_provider(keymgmt2);
26 const char *name2 = evp_first_name(prov2, EVP_KEYMGMT_number(keymgmt2));
28 return EVP_KEYMGMT_is_a(keymgmt1, name2);
31 int evp_keymgmt_util_try_import(const OSSL_PARAM params[], void *arg)
33 struct evp_keymgmt_util_try_import_data_st *data = arg;
35 /* Just in time creation of keydata */
36 if (data->keydata == NULL
37 && (data->keydata = evp_keymgmt_newdata(data->keymgmt)) == NULL) {
38 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
43 * It's fine if there was no data to transfer, we just end up with an
44 * empty destination key.
46 if (params[0].key == NULL)
49 return evp_keymgmt_import(data->keymgmt, data->keydata, data->selection,
53 int evp_keymgmt_util_assign_pkey(EVP_PKEY *pkey, EVP_KEYMGMT *keymgmt,
56 if (pkey == NULL || keymgmt == NULL || keydata == NULL
57 || !EVP_PKEY_set_type_by_keymgmt(pkey, keymgmt)) {
58 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
61 pkey->keydata = keydata;
62 evp_keymgmt_util_cache_keyinfo(pkey);
66 EVP_PKEY *evp_keymgmt_util_make_pkey(EVP_KEYMGMT *keymgmt, void *keydata)
68 EVP_PKEY *pkey = NULL;
72 || (pkey = EVP_PKEY_new()) == NULL
73 || !evp_keymgmt_util_assign_pkey(pkey, keymgmt, keydata)) {
80 int evp_keymgmt_util_export(const EVP_PKEY *pk, int selection,
81 OSSL_CALLBACK *export_cb, void *export_cbarg)
83 return evp_keymgmt_export(pk->keymgmt, pk->keydata, selection,
84 export_cb, export_cbarg);
87 void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt)
89 struct evp_keymgmt_util_try_import_data_st import_data;
92 /* Export to where? */
96 /* If we have an unassigned key, give up */
97 if (pk->keydata == NULL)
100 /* If |keymgmt| matches the "origin" |keymgmt|, no more to do */
101 if (pk->keymgmt == keymgmt)
104 if (!CRYPTO_THREAD_read_lock(pk->lock))
107 * If the provider native "origin" hasn't changed since last time, we
108 * try to find our keymgmt in the operation cache. If it has changed
109 * and our keymgmt isn't found, we will clear the cache further down.
111 if (pk->dirty_cnt == pk->dirty_cnt_copy) {
112 /* If this key is already exported to |keymgmt|, no more to do */
113 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
114 if (op != NULL && op->keymgmt != NULL) {
115 void *ret = op->keydata;
117 CRYPTO_THREAD_unlock(pk->lock);
121 CRYPTO_THREAD_unlock(pk->lock);
123 /* If the "origin" |keymgmt| doesn't support exporting, give up */
125 * TODO(3.0) consider an evp_keymgmt_export() return value that indicates
126 * that the method is unsupported.
128 if (pk->keymgmt->export == NULL)
132 * Make sure that the type of the keymgmt to export to matches the type
135 if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
139 * We look at the already cached provider keys, and import from the
140 * first that supports it (i.e. use its export function), and export
141 * the imported data to the new provider.
144 /* Setup for the export callback */
145 import_data.keydata = NULL; /* evp_keymgmt_util_try_import will create it */
146 import_data.keymgmt = keymgmt;
147 import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
150 * The export function calls the callback (evp_keymgmt_util_try_import),
151 * which does the import for us. If successful, we're done.
153 if (!evp_keymgmt_util_export(pk, OSSL_KEYMGMT_SELECT_ALL,
154 &evp_keymgmt_util_try_import, &import_data)) {
155 /* If there was an error, bail out */
156 evp_keymgmt_freedata(keymgmt, import_data.keydata);
160 if (!CRYPTO_THREAD_write_lock(pk->lock)) {
161 evp_keymgmt_freedata(keymgmt, import_data.keydata);
164 /* Check to make sure some other thread didn't get there first */
165 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
166 if (op != NULL && op->keydata != NULL) {
167 void *ret = op->keydata;
169 CRYPTO_THREAD_unlock(pk->lock);
172 * Another thread seemms to have already exported this so we abandon
173 * all the work we just did.
175 evp_keymgmt_freedata(keymgmt, import_data.keydata);
181 * If the dirty counter changed since last time, then clear the
182 * operation cache. In that case, we know that |i| is zero.
184 if (pk->dirty_cnt != pk->dirty_cnt_copy)
185 evp_keymgmt_util_clear_operation_cache(pk, 0);
187 /* Add the new export to the operation cache */
188 if (!evp_keymgmt_util_cache_keydata(pk, keymgmt, import_data.keydata)) {
189 evp_keymgmt_freedata(keymgmt, import_data.keydata);
193 /* Synchronize the dirty count */
194 pk->dirty_cnt_copy = pk->dirty_cnt;
196 CRYPTO_THREAD_unlock(pk->lock);
198 return import_data.keydata;
201 static void op_cache_free(OP_CACHE_ELEM *e)
203 evp_keymgmt_freedata(e->keymgmt, e->keydata);
204 EVP_KEYMGMT_free(e->keymgmt);
208 int evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk, int locking)
211 if (locking && pk->lock != NULL && !CRYPTO_THREAD_write_lock(pk->lock))
213 sk_OP_CACHE_ELEM_pop_free(pk->operation_cache, op_cache_free);
214 pk->operation_cache = NULL;
215 if (locking && pk->lock != NULL)
216 CRYPTO_THREAD_unlock(pk->lock);
222 OP_CACHE_ELEM *evp_keymgmt_util_find_operation_cache(EVP_PKEY *pk,
223 EVP_KEYMGMT *keymgmt)
225 int i, end = sk_OP_CACHE_ELEM_num(pk->operation_cache);
229 * A comparison and sk_P_CACHE_ELEM_find() are avoided to not cause
230 * problems when we've only a read lock.
232 for (i = 0; i < end; i++) {
233 p = sk_OP_CACHE_ELEM_value(pk->operation_cache, i);
234 if (keymgmt == p->keymgmt)
240 int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk,
241 EVP_KEYMGMT *keymgmt, void *keydata)
243 OP_CACHE_ELEM *p = NULL;
245 if (keydata != NULL) {
246 if (pk->operation_cache == NULL) {
247 pk->operation_cache = sk_OP_CACHE_ELEM_new_null();
248 if (pk->operation_cache == NULL)
252 p = OPENSSL_malloc(sizeof(*p));
255 p->keydata = keydata;
256 p->keymgmt = keymgmt;
258 if (!EVP_KEYMGMT_up_ref(keymgmt)) {
263 if (!sk_OP_CACHE_ELEM_push(pk->operation_cache, p)) {
264 EVP_KEYMGMT_free(keymgmt);
272 void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
275 * Cache information about the provider "origin" key.
277 * This services functions like EVP_PKEY_size, EVP_PKEY_bits, etc
279 if (pk->keydata != NULL) {
281 int security_bits = 0;
283 OSSL_PARAM params[4];
285 params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
286 params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
288 params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
289 params[3] = OSSL_PARAM_construct_end();
290 if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
291 pk->cache.size = size;
292 pk->cache.bits = bits;
293 pk->cache.security_bits = security_bits;
298 void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
299 int selection, const OSSL_PARAM params[])
301 void *keydata = NULL;
303 if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
304 || !evp_keymgmt_import(keymgmt, keydata, selection, params)
305 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
306 evp_keymgmt_freedata(keymgmt, keydata);
312 int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
314 /* Check if key is even assigned */
315 if (pk->keymgmt == NULL)
318 return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
322 * evp_keymgmt_util_match() doesn't just look at the provider side "origin",
323 * but also in the operation cache to see if there's any common keymgmt that
324 * supplies OP_keymgmt_match.
326 * evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_eq()
327 * and EVP_PKEY_parameters_eq() return, i.e.:
331 * -1 not same key type
332 * -2 unsupported operation
334 int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
336 EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
337 void *keydata1 = NULL, *keydata2 = NULL;
339 if (pk1 == NULL || pk2 == NULL) {
340 if (pk1 == NULL && pk2 == NULL)
345 keymgmt1 = pk1->keymgmt;
346 keydata1 = pk1->keydata;
347 keymgmt2 = pk2->keymgmt;
348 keydata2 = pk2->keydata;
350 if (keymgmt1 != keymgmt2) {
352 * The condition for a successful cross export is that the
353 * keydata to be exported is NULL (typed, but otherwise empty
354 * EVP_PKEY), or that it was possible to export it with
355 * evp_keymgmt_util_export_to_provider().
357 * We use |ok| to determine if it's ok to cross export one way,
358 * but also to determine if we should attempt a cross export
359 * the other way. There's no point doing it both ways.
363 /* Complex case, where the keymgmt differ */
366 && !match_type(keymgmt1, keymgmt2)) {
367 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
368 return -1; /* Not the same type */
372 * The key types are determined to match, so we try cross export,
373 * but only to keymgmt's that supply a matching function.
376 && keymgmt2->match != NULL) {
377 void *tmp_keydata = NULL;
380 if (keydata1 != NULL) {
382 evp_keymgmt_util_export_to_provider(pk1, keymgmt2);
383 ok = (tmp_keydata != NULL);
387 keydata1 = tmp_keydata;
391 * If we've successfully cross exported one way, there's no point
392 * doing it the other way, hence the |!ok| check.
396 && keymgmt1->match != NULL) {
397 void *tmp_keydata = NULL;
400 if (keydata2 != NULL) {
402 evp_keymgmt_util_export_to_provider(pk2, keymgmt1);
403 ok = (tmp_keydata != NULL);
407 keydata2 = tmp_keydata;
412 /* If we still don't have matching keymgmt implementations, we give up */
413 if (keymgmt1 != keymgmt2)
416 /* If both keydata are NULL, then they're the same key */
417 if (keydata1 == NULL && keydata2 == NULL)
419 /* If only one of the keydata is NULL, then they're different keys */
420 if (keydata1 == NULL || keydata2 == NULL)
422 /* If both keydata are non-NULL, we let the backend decide */
423 return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
426 int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
428 /* Save copies of pointers we want to play with without affecting |to| */
429 EVP_KEYMGMT *to_keymgmt = to->keymgmt;
430 void *to_keydata = to->keydata, *alloc_keydata = NULL;
432 /* An unassigned key can't be copied */
433 if (from == NULL || from->keydata == NULL)
437 * If |to| is unassigned, ensure it gets the same KEYMGMT as |from|,
438 * Note that the final setting of KEYMGMT is done further down, with
439 * EVP_PKEY_set_type_by_keymgmt(); we don't want to do that prematurely.
441 if (to_keymgmt == NULL)
442 to_keymgmt = from->keymgmt;
444 if (to_keymgmt == from->keymgmt && to_keymgmt->copy != NULL) {
445 /* Make sure there's somewhere to copy to */
446 if (to_keydata == NULL
447 && ((to_keydata = alloc_keydata = evp_keymgmt_newdata(to_keymgmt))
449 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
454 * |to| and |from| have the same keymgmt, and the copy function is
455 * implemented, so just copy and be done
457 if (!evp_keymgmt_copy(to_keymgmt, to_keydata, from->keydata,
459 evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
462 } else if (to_keymgmt == from->keymgmt && to_keymgmt->dup != NULL
463 && to_keydata == NULL) {
464 to_keydata = alloc_keydata = evp_keymgmt_dup(to_keymgmt,
467 if (to_keydata == NULL)
469 } else if (match_type(to_keymgmt, from->keymgmt)) {
470 struct evp_keymgmt_util_try_import_data_st import_data;
472 import_data.keymgmt = to_keymgmt;
473 import_data.keydata = to_keydata;
474 import_data.selection = selection;
476 if (!evp_keymgmt_util_export(from, selection,
477 &evp_keymgmt_util_try_import,
482 * In case to_keydata was previously unallocated,
483 * evp_keymgmt_util_try_import() may have created it for us.
485 if (to_keydata == NULL)
486 to_keydata = alloc_keydata = import_data.keydata;
488 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
493 * We only need to set the |to| type when its |keymgmt| isn't set.
494 * We can then just set its |keydata| to what we have, which might
495 * be exactly what it had when entering this function.
496 * This is a bit different from using evp_keymgmt_util_assign_pkey(),
497 * which isn't as careful with |to|'s original |keymgmt|, since it's
498 * meant to forcibly reassign an EVP_PKEY no matter what, which is
499 * why we don't use that one here.
501 if (to->keymgmt == NULL
502 && !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
503 evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
506 to->keydata = to_keydata;
507 evp_keymgmt_util_cache_keyinfo(to);
512 void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
513 void *genctx, OSSL_CALLBACK *cb, void *cbarg)
515 void *keydata = NULL;
517 if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
518 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
519 evp_keymgmt_freedata(keymgmt, keydata);
527 * Returns the same numbers as EVP_PKEY_get_default_digest_name()
528 * When the string from the EVP_KEYMGMT implementation is "", we use
529 * SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
530 * returns for no digest.
532 int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
534 char *mdname, size_t mdname_sz)
536 OSSL_PARAM params[3];
537 char mddefault[100] = "";
538 char mdmandatory[100] = "";
543 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
544 mddefault, sizeof(mddefault));
546 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
548 sizeof(mdmandatory));
549 params[2] = OSSL_PARAM_construct_end();
551 if (!evp_keymgmt_get_params(keymgmt, keydata, params))
554 if (OSSL_PARAM_modified(params + 1)) {
555 if (params[1].return_size <= 1) /* Only a NUL byte */
558 result = mdmandatory;
560 } else if (OSSL_PARAM_modified(params)) {
561 if (params[0].return_size <= 1) /* Only a NUL byte */
568 OPENSSL_strlcpy(mdname, result, mdname_sz);