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_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)
110 /* If |keymgmt| matches the "origin" |keymgmt|, no more to do */
111 if (pk->keymgmt == keymgmt)
114 if (!CRYPTO_THREAD_read_lock(pk->lock))
117 * If the provider native "origin" hasn't changed since last time, we
118 * try to find our keymgmt in the operation cache. If it has changed
119 * and our keymgmt isn't found, we will clear the cache further down.
121 if (pk->dirty_cnt == pk->dirty_cnt_copy) {
122 /* If this key is already exported to |keymgmt|, no more to do */
123 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
124 if (op != NULL && op->keymgmt != NULL) {
125 void *ret = op->keydata;
127 CRYPTO_THREAD_unlock(pk->lock);
131 CRYPTO_THREAD_unlock(pk->lock);
133 /* If the "origin" |keymgmt| doesn't support exporting, give up */
134 if (pk->keymgmt->export == NULL)
138 * Make sure that the type of the keymgmt to export to matches the type
141 if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
145 * We look at the already cached provider keys, and import from the
146 * first that supports it (i.e. use its export function), and export
147 * the imported data to the new provider.
150 /* Setup for the export callback */
151 import_data.keydata = NULL; /* evp_keymgmt_util_try_import will create it */
152 import_data.keymgmt = keymgmt;
153 import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
156 * The export function calls the callback (evp_keymgmt_util_try_import),
157 * which does the import for us. If successful, we're done.
159 if (!evp_keymgmt_util_export(pk, OSSL_KEYMGMT_SELECT_ALL,
160 &evp_keymgmt_util_try_import, &import_data))
161 /* If there was an error, bail out */
164 if (!CRYPTO_THREAD_write_lock(pk->lock)) {
165 evp_keymgmt_freedata(keymgmt, import_data.keydata);
168 /* Check to make sure some other thread didn't get there first */
169 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
170 if (op != NULL && op->keydata != NULL) {
171 void *ret = op->keydata;
173 CRYPTO_THREAD_unlock(pk->lock);
176 * Another thread seemms to have already exported this so we abandon
177 * all the work we just did.
179 evp_keymgmt_freedata(keymgmt, import_data.keydata);
185 * If the dirty counter changed since last time, then clear the
186 * operation cache. In that case, we know that |i| is zero.
188 if (pk->dirty_cnt != pk->dirty_cnt_copy)
189 evp_keymgmt_util_clear_operation_cache(pk, 0);
191 /* Add the new export to the operation cache */
192 if (!evp_keymgmt_util_cache_keydata(pk, keymgmt, import_data.keydata)) {
193 evp_keymgmt_freedata(keymgmt, import_data.keydata);
197 /* Synchronize the dirty count */
198 pk->dirty_cnt_copy = pk->dirty_cnt;
200 CRYPTO_THREAD_unlock(pk->lock);
202 return import_data.keydata;
205 static void op_cache_free(OP_CACHE_ELEM *e)
207 evp_keymgmt_freedata(e->keymgmt, e->keydata);
208 EVP_KEYMGMT_free(e->keymgmt);
212 int evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk, int locking)
215 if (locking && pk->lock != NULL && !CRYPTO_THREAD_write_lock(pk->lock))
217 sk_OP_CACHE_ELEM_pop_free(pk->operation_cache, op_cache_free);
218 pk->operation_cache = NULL;
219 if (locking && pk->lock != NULL)
220 CRYPTO_THREAD_unlock(pk->lock);
226 OP_CACHE_ELEM *evp_keymgmt_util_find_operation_cache(EVP_PKEY *pk,
227 EVP_KEYMGMT *keymgmt)
229 int i, end = sk_OP_CACHE_ELEM_num(pk->operation_cache);
233 * A comparison and sk_P_CACHE_ELEM_find() are avoided to not cause
234 * problems when we've only a read lock.
236 for (i = 0; i < end; i++) {
237 p = sk_OP_CACHE_ELEM_value(pk->operation_cache, i);
238 if (keymgmt == p->keymgmt)
244 int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk,
245 EVP_KEYMGMT *keymgmt, void *keydata)
247 OP_CACHE_ELEM *p = NULL;
249 if (keydata != NULL) {
250 if (pk->operation_cache == NULL) {
251 pk->operation_cache = sk_OP_CACHE_ELEM_new_null();
252 if (pk->operation_cache == NULL)
256 p = OPENSSL_malloc(sizeof(*p));
259 p->keydata = keydata;
260 p->keymgmt = keymgmt;
262 if (!EVP_KEYMGMT_up_ref(keymgmt)) {
267 if (!sk_OP_CACHE_ELEM_push(pk->operation_cache, p)) {
268 EVP_KEYMGMT_free(keymgmt);
276 void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
279 * Cache information about the provider "origin" key.
281 * This services functions like EVP_PKEY_size, EVP_PKEY_bits, etc
283 if (pk->keydata != NULL) {
285 int security_bits = 0;
287 OSSL_PARAM params[4];
289 params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
290 params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
292 params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
293 params[3] = OSSL_PARAM_construct_end();
294 if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
295 pk->cache.size = size;
296 pk->cache.bits = bits;
297 pk->cache.security_bits = security_bits;
302 void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
303 int selection, const OSSL_PARAM params[])
305 void *keydata = NULL;
307 if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
308 || !evp_keymgmt_import(keymgmt, keydata, selection, params)
309 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
310 evp_keymgmt_freedata(keymgmt, keydata);
316 int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
318 /* Check if key is even assigned */
319 if (pk->keymgmt == NULL)
322 return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
326 * evp_keymgmt_util_match() doesn't just look at the provider side "origin",
327 * but also in the operation cache to see if there's any common keymgmt that
328 * supplies OP_keymgmt_match.
330 * evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_eq()
331 * and EVP_PKEY_parameters_eq() return, i.e.:
335 * -1 not same key type
336 * -2 unsupported operation
338 int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
340 EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
341 void *keydata1 = NULL, *keydata2 = NULL;
343 if (pk1 == NULL || pk2 == NULL) {
344 if (pk1 == NULL && pk2 == NULL)
349 keymgmt1 = pk1->keymgmt;
350 keydata1 = pk1->keydata;
351 keymgmt2 = pk2->keymgmt;
352 keydata2 = pk2->keydata;
354 if (keymgmt1 != keymgmt2) {
356 * The condition for a successful cross export is that the
357 * keydata to be exported is NULL (typed, but otherwise empty
358 * EVP_PKEY), or that it was possible to export it with
359 * evp_keymgmt_util_export_to_provider().
361 * We use |ok| to determine if it's ok to cross export one way,
362 * but also to determine if we should attempt a cross export
363 * the other way. There's no point doing it both ways.
367 /* Complex case, where the keymgmt differ */
370 && !match_type(keymgmt1, keymgmt2)) {
371 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
372 return -1; /* Not the same type */
376 * The key types are determined to match, so we try cross export,
377 * but only to keymgmt's that supply a matching function.
380 && keymgmt2->match != NULL) {
381 void *tmp_keydata = NULL;
384 if (keydata1 != NULL) {
386 evp_keymgmt_util_export_to_provider(pk1, keymgmt2);
387 ok = (tmp_keydata != NULL);
391 keydata1 = tmp_keydata;
395 * If we've successfully cross exported one way, there's no point
396 * doing it the other way, hence the |!ok| check.
400 && keymgmt1->match != NULL) {
401 void *tmp_keydata = NULL;
404 if (keydata2 != NULL) {
406 evp_keymgmt_util_export_to_provider(pk2, keymgmt1);
407 ok = (tmp_keydata != NULL);
411 keydata2 = tmp_keydata;
416 /* If we still don't have matching keymgmt implementations, we give up */
417 if (keymgmt1 != keymgmt2)
420 /* If both keydata are NULL, then they're the same key */
421 if (keydata1 == NULL && keydata2 == NULL)
423 /* If only one of the keydata is NULL, then they're different keys */
424 if (keydata1 == NULL || keydata2 == NULL)
426 /* If both keydata are non-NULL, we let the backend decide */
427 return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
430 int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
432 /* Save copies of pointers we want to play with without affecting |to| */
433 EVP_KEYMGMT *to_keymgmt = to->keymgmt;
434 void *to_keydata = to->keydata, *alloc_keydata = NULL;
436 /* An unassigned key can't be copied */
437 if (from == NULL || from->keydata == NULL)
441 * If |to| is unassigned, ensure it gets the same KEYMGMT as |from|,
442 * Note that the final setting of KEYMGMT is done further down, with
443 * EVP_PKEY_set_type_by_keymgmt(); we don't want to do that prematurely.
445 if (to_keymgmt == NULL)
446 to_keymgmt = from->keymgmt;
448 if (to_keymgmt == from->keymgmt && to_keymgmt->dup != NULL
449 && to_keydata == NULL) {
450 to_keydata = alloc_keydata = evp_keymgmt_dup(to_keymgmt,
453 if (to_keydata == NULL)
455 } else if (match_type(to_keymgmt, from->keymgmt)) {
456 struct evp_keymgmt_util_try_import_data_st import_data;
458 import_data.keymgmt = to_keymgmt;
459 import_data.keydata = to_keydata;
460 import_data.selection = selection;
462 if (!evp_keymgmt_util_export(from, selection,
463 &evp_keymgmt_util_try_import,
468 * In case to_keydata was previously unallocated,
469 * evp_keymgmt_util_try_import() may have created it for us.
471 if (to_keydata == NULL)
472 to_keydata = alloc_keydata = import_data.keydata;
474 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
479 * We only need to set the |to| type when its |keymgmt| isn't set.
480 * We can then just set its |keydata| to what we have, which might
481 * be exactly what it had when entering this function.
482 * This is a bit different from using evp_keymgmt_util_assign_pkey(),
483 * which isn't as careful with |to|'s original |keymgmt|, since it's
484 * meant to forcibly reassign an EVP_PKEY no matter what, which is
485 * why we don't use that one here.
487 if (to->keymgmt == NULL
488 && !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
489 evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
492 to->keydata = to_keydata;
493 evp_keymgmt_util_cache_keyinfo(to);
498 void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
499 void *genctx, OSSL_CALLBACK *cb, void *cbarg)
501 void *keydata = NULL;
503 if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
504 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
505 evp_keymgmt_freedata(keymgmt, keydata);
513 * Returns the same numbers as EVP_PKEY_get_default_digest_name()
514 * When the string from the EVP_KEYMGMT implementation is "", we use
515 * SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
516 * returns for no digest.
518 int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
520 char *mdname, size_t mdname_sz)
522 OSSL_PARAM params[3];
523 char mddefault[100] = "";
524 char mdmandatory[100] = "";
529 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
530 mddefault, sizeof(mddefault));
532 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
534 sizeof(mdmandatory));
535 params[2] = OSSL_PARAM_construct_end();
537 if (!evp_keymgmt_get_params(keymgmt, keydata, params))
540 if (OSSL_PARAM_modified(params + 1)) {
541 if (params[1].return_size <= 1) /* Only a NUL byte */
544 result = mdmandatory;
546 } else if (OSSL_PARAM_modified(params)) {
547 if (params[0].return_size <= 1) /* Only a NUL byte */
554 OPENSSL_strlcpy(mdname, result, mdname_sz);