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 if (pk == NULL || export_cb == NULL)
85 return evp_keymgmt_export(pk->keymgmt, pk->keydata, selection,
86 export_cb, export_cbarg);
89 void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt)
91 struct evp_keymgmt_util_try_import_data_st import_data;
94 /* Export to where? */
98 /* If we have an unassigned key, give up */
99 if (pk->keydata == NULL)
102 /* If |keymgmt| matches the "origin" |keymgmt|, no more to do */
103 if (pk->keymgmt == keymgmt)
106 if (!CRYPTO_THREAD_read_lock(pk->lock))
109 * If the provider native "origin" hasn't changed since last time, we
110 * try to find our keymgmt in the operation cache. If it has changed
111 * and our keymgmt isn't found, we will clear the cache further down.
113 if (pk->dirty_cnt == pk->dirty_cnt_copy) {
114 /* If this key is already exported to |keymgmt|, no more to do */
115 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
116 if (op != NULL && op->keymgmt != NULL) {
117 void *ret = op->keydata;
119 CRYPTO_THREAD_unlock(pk->lock);
123 CRYPTO_THREAD_unlock(pk->lock);
125 /* If the "origin" |keymgmt| doesn't support exporting, give up */
126 if (pk->keymgmt->export == NULL)
130 * Make sure that the type of the keymgmt to export to matches the type
133 if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
137 * We look at the already cached provider keys, and import from the
138 * first that supports it (i.e. use its export function), and export
139 * the imported data to the new provider.
142 /* Setup for the export callback */
143 import_data.keydata = NULL; /* evp_keymgmt_util_try_import will create it */
144 import_data.keymgmt = keymgmt;
145 import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
148 * The export function calls the callback (evp_keymgmt_util_try_import),
149 * which does the import for us. If successful, we're done.
151 if (!evp_keymgmt_util_export(pk, OSSL_KEYMGMT_SELECT_ALL,
152 &evp_keymgmt_util_try_import, &import_data)) {
153 /* If there was an error, bail out */
154 evp_keymgmt_freedata(keymgmt, import_data.keydata);
158 if (!CRYPTO_THREAD_write_lock(pk->lock)) {
159 evp_keymgmt_freedata(keymgmt, import_data.keydata);
162 /* Check to make sure some other thread didn't get there first */
163 op = evp_keymgmt_util_find_operation_cache(pk, keymgmt);
164 if (op != NULL && op->keydata != NULL) {
165 void *ret = op->keydata;
167 CRYPTO_THREAD_unlock(pk->lock);
170 * Another thread seemms to have already exported this so we abandon
171 * all the work we just did.
173 evp_keymgmt_freedata(keymgmt, import_data.keydata);
179 * If the dirty counter changed since last time, then clear the
180 * operation cache. In that case, we know that |i| is zero.
182 if (pk->dirty_cnt != pk->dirty_cnt_copy)
183 evp_keymgmt_util_clear_operation_cache(pk, 0);
185 /* Add the new export to the operation cache */
186 if (!evp_keymgmt_util_cache_keydata(pk, keymgmt, import_data.keydata)) {
187 evp_keymgmt_freedata(keymgmt, import_data.keydata);
191 /* Synchronize the dirty count */
192 pk->dirty_cnt_copy = pk->dirty_cnt;
194 CRYPTO_THREAD_unlock(pk->lock);
196 return import_data.keydata;
199 static void op_cache_free(OP_CACHE_ELEM *e)
201 evp_keymgmt_freedata(e->keymgmt, e->keydata);
202 EVP_KEYMGMT_free(e->keymgmt);
206 int evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk, int locking)
209 if (locking && pk->lock != NULL && !CRYPTO_THREAD_write_lock(pk->lock))
211 sk_OP_CACHE_ELEM_pop_free(pk->operation_cache, op_cache_free);
212 pk->operation_cache = NULL;
213 if (locking && pk->lock != NULL)
214 CRYPTO_THREAD_unlock(pk->lock);
220 OP_CACHE_ELEM *evp_keymgmt_util_find_operation_cache(EVP_PKEY *pk,
221 EVP_KEYMGMT *keymgmt)
223 int i, end = sk_OP_CACHE_ELEM_num(pk->operation_cache);
227 * A comparison and sk_P_CACHE_ELEM_find() are avoided to not cause
228 * problems when we've only a read lock.
230 for (i = 0; i < end; i++) {
231 p = sk_OP_CACHE_ELEM_value(pk->operation_cache, i);
232 if (keymgmt == p->keymgmt)
238 int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk,
239 EVP_KEYMGMT *keymgmt, void *keydata)
241 OP_CACHE_ELEM *p = NULL;
243 if (keydata != NULL) {
244 if (pk->operation_cache == NULL) {
245 pk->operation_cache = sk_OP_CACHE_ELEM_new_null();
246 if (pk->operation_cache == NULL)
250 p = OPENSSL_malloc(sizeof(*p));
253 p->keydata = keydata;
254 p->keymgmt = keymgmt;
256 if (!EVP_KEYMGMT_up_ref(keymgmt)) {
261 if (!sk_OP_CACHE_ELEM_push(pk->operation_cache, p)) {
262 EVP_KEYMGMT_free(keymgmt);
270 void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
273 * Cache information about the provider "origin" key.
275 * This services functions like EVP_PKEY_size, EVP_PKEY_bits, etc
277 if (pk->keydata != NULL) {
279 int security_bits = 0;
281 OSSL_PARAM params[4];
283 params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
284 params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
286 params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
287 params[3] = OSSL_PARAM_construct_end();
288 if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
289 pk->cache.size = size;
290 pk->cache.bits = bits;
291 pk->cache.security_bits = security_bits;
296 void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
297 int selection, const OSSL_PARAM params[])
299 void *keydata = NULL;
301 if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
302 || !evp_keymgmt_import(keymgmt, keydata, selection, params)
303 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
304 evp_keymgmt_freedata(keymgmt, keydata);
310 int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
312 /* Check if key is even assigned */
313 if (pk->keymgmt == NULL)
316 return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
320 * evp_keymgmt_util_match() doesn't just look at the provider side "origin",
321 * but also in the operation cache to see if there's any common keymgmt that
322 * supplies OP_keymgmt_match.
324 * evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_eq()
325 * and EVP_PKEY_parameters_eq() return, i.e.:
329 * -1 not same key type
330 * -2 unsupported operation
332 int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
334 EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
335 void *keydata1 = NULL, *keydata2 = NULL;
337 if (pk1 == NULL || pk2 == NULL) {
338 if (pk1 == NULL && pk2 == NULL)
343 keymgmt1 = pk1->keymgmt;
344 keydata1 = pk1->keydata;
345 keymgmt2 = pk2->keymgmt;
346 keydata2 = pk2->keydata;
348 if (keymgmt1 != keymgmt2) {
350 * The condition for a successful cross export is that the
351 * keydata to be exported is NULL (typed, but otherwise empty
352 * EVP_PKEY), or that it was possible to export it with
353 * evp_keymgmt_util_export_to_provider().
355 * We use |ok| to determine if it's ok to cross export one way,
356 * but also to determine if we should attempt a cross export
357 * the other way. There's no point doing it both ways.
361 /* Complex case, where the keymgmt differ */
364 && !match_type(keymgmt1, keymgmt2)) {
365 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
366 return -1; /* Not the same type */
370 * The key types are determined to match, so we try cross export,
371 * but only to keymgmt's that supply a matching function.
374 && keymgmt2->match != NULL) {
375 void *tmp_keydata = NULL;
378 if (keydata1 != NULL) {
380 evp_keymgmt_util_export_to_provider(pk1, keymgmt2);
381 ok = (tmp_keydata != NULL);
385 keydata1 = tmp_keydata;
389 * If we've successfully cross exported one way, there's no point
390 * doing it the other way, hence the |!ok| check.
394 && keymgmt1->match != NULL) {
395 void *tmp_keydata = NULL;
398 if (keydata2 != NULL) {
400 evp_keymgmt_util_export_to_provider(pk2, keymgmt1);
401 ok = (tmp_keydata != NULL);
405 keydata2 = tmp_keydata;
410 /* If we still don't have matching keymgmt implementations, we give up */
411 if (keymgmt1 != keymgmt2)
414 /* If both keydata are NULL, then they're the same key */
415 if (keydata1 == NULL && keydata2 == NULL)
417 /* If only one of the keydata is NULL, then they're different keys */
418 if (keydata1 == NULL || keydata2 == NULL)
420 /* If both keydata are non-NULL, we let the backend decide */
421 return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
424 int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
426 /* Save copies of pointers we want to play with without affecting |to| */
427 EVP_KEYMGMT *to_keymgmt = to->keymgmt;
428 void *to_keydata = to->keydata, *alloc_keydata = NULL;
430 /* An unassigned key can't be copied */
431 if (from == NULL || from->keydata == NULL)
435 * If |to| is unassigned, ensure it gets the same KEYMGMT as |from|,
436 * Note that the final setting of KEYMGMT is done further down, with
437 * EVP_PKEY_set_type_by_keymgmt(); we don't want to do that prematurely.
439 if (to_keymgmt == NULL)
440 to_keymgmt = from->keymgmt;
442 if (to_keymgmt == from->keymgmt && to_keymgmt->dup != NULL
443 && to_keydata == NULL) {
444 to_keydata = alloc_keydata = evp_keymgmt_dup(to_keymgmt,
447 if (to_keydata == NULL)
449 } else if (match_type(to_keymgmt, from->keymgmt)) {
450 struct evp_keymgmt_util_try_import_data_st import_data;
452 import_data.keymgmt = to_keymgmt;
453 import_data.keydata = to_keydata;
454 import_data.selection = selection;
456 if (!evp_keymgmt_util_export(from, selection,
457 &evp_keymgmt_util_try_import,
462 * In case to_keydata was previously unallocated,
463 * evp_keymgmt_util_try_import() may have created it for us.
465 if (to_keydata == NULL)
466 to_keydata = alloc_keydata = import_data.keydata;
468 ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
473 * We only need to set the |to| type when its |keymgmt| isn't set.
474 * We can then just set its |keydata| to what we have, which might
475 * be exactly what it had when entering this function.
476 * This is a bit different from using evp_keymgmt_util_assign_pkey(),
477 * which isn't as careful with |to|'s original |keymgmt|, since it's
478 * meant to forcibly reassign an EVP_PKEY no matter what, which is
479 * why we don't use that one here.
481 if (to->keymgmt == NULL
482 && !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
483 evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
486 to->keydata = to_keydata;
487 evp_keymgmt_util_cache_keyinfo(to);
492 void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
493 void *genctx, OSSL_CALLBACK *cb, void *cbarg)
495 void *keydata = NULL;
497 if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
498 || !evp_keymgmt_util_assign_pkey(target, keymgmt, keydata)) {
499 evp_keymgmt_freedata(keymgmt, keydata);
507 * Returns the same numbers as EVP_PKEY_get_default_digest_name()
508 * When the string from the EVP_KEYMGMT implementation is "", we use
509 * SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
510 * returns for no digest.
512 int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
514 char *mdname, size_t mdname_sz)
516 OSSL_PARAM params[3];
517 char mddefault[100] = "";
518 char mdmandatory[100] = "";
523 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
524 mddefault, sizeof(mddefault));
526 OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
528 sizeof(mdmandatory));
529 params[2] = OSSL_PARAM_construct_end();
531 if (!evp_keymgmt_get_params(keymgmt, keydata, params))
534 if (OSSL_PARAM_modified(params + 1)) {
535 if (params[1].return_size <= 1) /* Only a NUL byte */
538 result = mdmandatory;
540 } else if (OSSL_PARAM_modified(params)) {
541 if (params[0].return_size <= 1) /* Only a NUL byte */
548 OPENSSL_strlcpy(mdname, result, mdname_sz);