-
Notifications
You must be signed in to change notification settings - Fork 21
/
Copy pathpk.c
1503 lines (1320 loc) · 50.4 KB
/
pk.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Public Key abstraction layer
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "common.h"
#if defined(MBEDTLS_PK_C)
#include "mbedtls/pk.h"
#include "pk_wrap.h"
#include "pkwrite.h"
#include "pk_internal.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h"
#include "rsa_internal.h"
#endif
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
#include "mbedtls/ecp.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
#include "psa_util_internal.h"
#include "mbedtls/psa_util.h"
#endif
#include <limits.h>
#include <stdint.h>
/*
* Initialise a mbedtls_pk_context
*/
void mbedtls_pk_init(mbedtls_pk_context *ctx)
{
ctx->pk_info = NULL;
ctx->pk_ctx = NULL;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ctx->priv_id = MBEDTLS_SVC_KEY_ID_INIT;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
memset(ctx->pub_raw, 0, sizeof(ctx->pub_raw));
ctx->pub_raw_len = 0;
ctx->ec_family = 0;
ctx->ec_bits = 0;
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
}
/*
* Free (the components of) a mbedtls_pk_context
*/
void mbedtls_pk_free(mbedtls_pk_context *ctx)
{
if (ctx == NULL) {
return;
}
if ((ctx->pk_info != NULL) && (ctx->pk_info->ctx_free_func != NULL)) {
ctx->pk_info->ctx_free_func(ctx->pk_ctx);
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
/* The ownership of the priv_id key for opaque keys is external of the PK
* module. It's the user responsibility to clear it after use. */
if ((ctx->pk_info != NULL) && (ctx->pk_info->type != MBEDTLS_PK_OPAQUE)) {
psa_destroy_key(ctx->priv_id);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_pk_context));
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/*
* Initialize a restart context
*/
void mbedtls_pk_restart_init(mbedtls_pk_restart_ctx *ctx)
{
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
/*
* Free the components of a restart context
*/
void mbedtls_pk_restart_free(mbedtls_pk_restart_ctx *ctx)
{
if (ctx == NULL || ctx->pk_info == NULL ||
ctx->pk_info->rs_free_func == NULL) {
return;
}
ctx->pk_info->rs_free_func(ctx->rs_ctx);
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
/*
* Get pk_info structure from type
*/
const mbedtls_pk_info_t *mbedtls_pk_info_from_type(mbedtls_pk_type_t pk_type)
{
switch (pk_type) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
return &mbedtls_rsa_info;
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
case MBEDTLS_PK_ECKEY:
return &mbedtls_eckey_info;
case MBEDTLS_PK_ECKEY_DH:
return &mbedtls_eckeydh_info;
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#if defined(MBEDTLS_PK_CAN_ECDSA_SOME)
case MBEDTLS_PK_ECDSA:
return &mbedtls_ecdsa_info;
#endif /* MBEDTLS_PK_CAN_ECDSA_SOME */
/* MBEDTLS_PK_RSA_ALT omitted on purpose */
default:
return NULL;
}
}
/*
* Initialise context
*/
int mbedtls_pk_setup(mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info)
{
if (info == NULL || ctx->pk_info != NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if ((info->ctx_alloc_func != NULL) &&
((ctx->pk_ctx = info->ctx_alloc_func()) == NULL)) {
return MBEDTLS_ERR_PK_ALLOC_FAILED;
}
ctx->pk_info = info;
return 0;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Initialise a PSA-wrapping context
*/
int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx,
const mbedtls_svc_key_id_t key)
{
const mbedtls_pk_info_t *info = NULL;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t type;
if (ctx == NULL || ctx->pk_info != NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if (PSA_SUCCESS != psa_get_key_attributes(key, &attributes)) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
type = psa_get_key_type(&attributes);
psa_reset_key_attributes(&attributes);
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)) {
info = &mbedtls_ecdsa_opaque_info;
} else
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
if (type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
info = &mbedtls_rsa_opaque_info;
} else {
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
}
ctx->pk_info = info;
ctx->priv_id = key;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/*
* Initialize an RSA-alt context
*/
int mbedtls_pk_setup_rsa_alt(mbedtls_pk_context *ctx, void *key,
mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
mbedtls_pk_rsa_alt_sign_func sign_func,
mbedtls_pk_rsa_alt_key_len_func key_len_func)
{
mbedtls_rsa_alt_context *rsa_alt;
const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info;
if (ctx->pk_info != NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if ((ctx->pk_ctx = info->ctx_alloc_func()) == NULL) {
return MBEDTLS_ERR_PK_ALLOC_FAILED;
}
ctx->pk_info = info;
rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx;
rsa_alt->key = key;
rsa_alt->decrypt_func = decrypt_func;
rsa_alt->sign_func = sign_func;
rsa_alt->key_len_func = key_len_func;
return 0;
}
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
/*
* Tell if a PK can do the operations of the given type
*/
int mbedtls_pk_can_do(const mbedtls_pk_context *ctx, mbedtls_pk_type_t type)
{
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if (ctx == NULL || ctx->pk_info == NULL) {
return 0;
}
return ctx->pk_info->can_do(type);
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Tell if a PK can do the operations of the given PSA algorithm
*/
int mbedtls_pk_can_do_ext(const mbedtls_pk_context *ctx, psa_algorithm_t alg,
psa_key_usage_t usage)
{
psa_key_usage_t key_usage;
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if (ctx == NULL || ctx->pk_info == NULL) {
return 0;
}
/* Filter out non allowed algorithms */
if (PSA_ALG_IS_ECDSA(alg) == 0 &&
PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) == 0 &&
PSA_ALG_IS_RSA_PSS(alg) == 0 &&
alg != PSA_ALG_RSA_PKCS1V15_CRYPT &&
PSA_ALG_IS_ECDH(alg) == 0) {
return 0;
}
/* Filter out non allowed usage flags */
if (usage == 0 ||
(usage & ~(PSA_KEY_USAGE_SIGN_HASH |
PSA_KEY_USAGE_DECRYPT |
PSA_KEY_USAGE_DERIVE)) != 0) {
return 0;
}
/* Wildcard hash is not allowed */
if (PSA_ALG_IS_SIGN_HASH(alg) &&
PSA_ALG_SIGN_GET_HASH(alg) == PSA_ALG_ANY_HASH) {
return 0;
}
if (mbedtls_pk_get_type(ctx) != MBEDTLS_PK_OPAQUE) {
mbedtls_pk_type_t type;
if (PSA_ALG_IS_ECDSA(alg) || PSA_ALG_IS_ECDH(alg)) {
type = MBEDTLS_PK_ECKEY;
} else if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) ||
alg == PSA_ALG_RSA_PKCS1V15_CRYPT) {
type = MBEDTLS_PK_RSA;
} else if (PSA_ALG_IS_RSA_PSS(alg)) {
type = MBEDTLS_PK_RSASSA_PSS;
} else {
return 0;
}
if (ctx->pk_info->can_do(type) == 0) {
return 0;
}
switch (type) {
case MBEDTLS_PK_ECKEY:
key_usage = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_DERIVE;
break;
case MBEDTLS_PK_RSA:
case MBEDTLS_PK_RSASSA_PSS:
key_usage = PSA_KEY_USAGE_SIGN_HASH |
PSA_KEY_USAGE_SIGN_MESSAGE |
PSA_KEY_USAGE_DECRYPT;
break;
default:
/* Should never happen */
return 0;
}
return (key_usage & usage) == usage;
}
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_status_t status;
status = psa_get_key_attributes(ctx->priv_id, &attributes);
if (status != PSA_SUCCESS) {
return 0;
}
psa_algorithm_t key_alg = psa_get_key_algorithm(&attributes);
/* Key's enrollment is available only when an Mbed TLS implementation of PSA
* Crypto is being used, i.e. when MBEDTLS_PSA_CRYPTO_C is defined.
* Even though we don't officially support using other implementations of PSA
* Crypto with TLS and X.509 (yet), we try to keep vendor's customizations
* separated. */
#if defined(MBEDTLS_PSA_CRYPTO_C)
psa_algorithm_t key_alg2 = psa_get_key_enrollment_algorithm(&attributes);
#endif /* MBEDTLS_PSA_CRYPTO_C */
key_usage = psa_get_key_usage_flags(&attributes);
psa_reset_key_attributes(&attributes);
if ((key_usage & usage) != usage) {
return 0;
}
/*
* Common case: the key alg [or alg2] only allows alg.
* This will match PSA_ALG_RSA_PKCS1V15_CRYPT & PSA_ALG_IS_ECDH
* directly.
* This would also match ECDSA/RSA_PKCS1V15_SIGN/RSA_PSS with
* a fixed hash on key_alg [or key_alg2].
*/
if (alg == key_alg) {
return 1;
}
#if defined(MBEDTLS_PSA_CRYPTO_C)
if (alg == key_alg2) {
return 1;
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
/*
* If key_alg [or key_alg2] is a hash-and-sign with a wildcard for the hash,
* and alg is the same hash-and-sign family with any hash,
* then alg is compliant with this key alg
*/
if (PSA_ALG_IS_SIGN_HASH(alg)) {
if (PSA_ALG_IS_SIGN_HASH(key_alg) &&
PSA_ALG_SIGN_GET_HASH(key_alg) == PSA_ALG_ANY_HASH &&
(alg & ~PSA_ALG_HASH_MASK) == (key_alg & ~PSA_ALG_HASH_MASK)) {
return 1;
}
#if defined(MBEDTLS_PSA_CRYPTO_C)
if (PSA_ALG_IS_SIGN_HASH(key_alg2) &&
PSA_ALG_SIGN_GET_HASH(key_alg2) == PSA_ALG_ANY_HASH &&
(alg & ~PSA_ALG_HASH_MASK) == (key_alg2 & ~PSA_ALG_HASH_MASK)) {
return 1;
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
#if defined(MBEDTLS_RSA_C)
static psa_algorithm_t psa_algorithm_for_rsa(const mbedtls_rsa_context *rsa,
int want_crypt)
{
if (mbedtls_rsa_get_padding_mode(rsa) == MBEDTLS_RSA_PKCS_V21) {
if (want_crypt) {
mbedtls_md_type_t md_type = (mbedtls_md_type_t) mbedtls_rsa_get_md_alg(rsa);
return PSA_ALG_RSA_OAEP(mbedtls_md_psa_alg_from_type(md_type));
} else {
return PSA_ALG_RSA_PSS_ANY_SALT(PSA_ALG_ANY_HASH);
}
} else {
if (want_crypt) {
return PSA_ALG_RSA_PKCS1V15_CRYPT;
} else {
return PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_ANY_HASH);
}
}
}
#endif /* MBEDTLS_RSA_C */
int mbedtls_pk_get_psa_attributes(const mbedtls_pk_context *pk,
psa_key_usage_t usage,
psa_key_attributes_t *attributes)
{
mbedtls_pk_type_t pk_type = mbedtls_pk_get_type(pk);
psa_key_usage_t more_usage = usage;
if (usage == PSA_KEY_USAGE_SIGN_MESSAGE) {
more_usage |= PSA_KEY_USAGE_VERIFY_MESSAGE;
} else if (usage == PSA_KEY_USAGE_SIGN_HASH) {
more_usage |= PSA_KEY_USAGE_VERIFY_HASH;
} else if (usage == PSA_KEY_USAGE_DECRYPT) {
more_usage |= PSA_KEY_USAGE_ENCRYPT;
}
more_usage |= PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_COPY;
int want_private = !(usage == PSA_KEY_USAGE_VERIFY_MESSAGE ||
usage == PSA_KEY_USAGE_VERIFY_HASH ||
usage == PSA_KEY_USAGE_ENCRYPT);
switch (pk_type) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
{
int want_crypt = 0; /* 0: sign/verify; 1: encrypt/decrypt */
switch (usage) {
case PSA_KEY_USAGE_SIGN_MESSAGE:
case PSA_KEY_USAGE_SIGN_HASH:
case PSA_KEY_USAGE_VERIFY_MESSAGE:
case PSA_KEY_USAGE_VERIFY_HASH:
/* Nothing to do. */
break;
case PSA_KEY_USAGE_DECRYPT:
case PSA_KEY_USAGE_ENCRYPT:
want_crypt = 1;
break;
default:
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
/* Detect the presence of a private key in a way that works both
* in CRT and non-CRT configurations. */
mbedtls_rsa_context *rsa = mbedtls_pk_rsa(*pk);
int has_private = (mbedtls_rsa_check_privkey(rsa) == 0);
if (want_private && !has_private) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
psa_set_key_type(attributes, (want_private ?
PSA_KEY_TYPE_RSA_KEY_PAIR :
PSA_KEY_TYPE_RSA_PUBLIC_KEY));
psa_set_key_bits(attributes, mbedtls_pk_get_bitlen(pk));
psa_set_key_algorithm(attributes,
psa_algorithm_for_rsa(rsa, want_crypt));
break;
}
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
case MBEDTLS_PK_ECKEY:
case MBEDTLS_PK_ECKEY_DH:
case MBEDTLS_PK_ECDSA:
{
int sign_ok = (pk_type != MBEDTLS_PK_ECKEY_DH);
int derive_ok = (pk_type != MBEDTLS_PK_ECDSA);
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
psa_ecc_family_t family = pk->ec_family;
size_t bits = pk->ec_bits;
int has_private = 0;
if (pk->priv_id != MBEDTLS_SVC_KEY_ID_INIT) {
has_private = 1;
}
#else
const mbedtls_ecp_keypair *ec = mbedtls_pk_ec_ro(*pk);
int has_private = (ec->d.n != 0);
size_t bits = 0;
psa_ecc_family_t family =
mbedtls_ecc_group_to_psa(ec->grp.id, &bits);
#endif
psa_algorithm_t alg = 0;
switch (usage) {
case PSA_KEY_USAGE_SIGN_MESSAGE:
case PSA_KEY_USAGE_SIGN_HASH:
case PSA_KEY_USAGE_VERIFY_MESSAGE:
case PSA_KEY_USAGE_VERIFY_HASH:
if (!sign_ok) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
alg = PSA_ALG_DETERMINISTIC_ECDSA(PSA_ALG_ANY_HASH);
#else
alg = PSA_ALG_ECDSA(PSA_ALG_ANY_HASH);
#endif
break;
case PSA_KEY_USAGE_DERIVE:
alg = PSA_ALG_ECDH;
if (!derive_ok) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
break;
default:
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
if (want_private && !has_private) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
psa_set_key_type(attributes, (want_private ?
PSA_KEY_TYPE_ECC_KEY_PAIR(family) :
PSA_KEY_TYPE_ECC_PUBLIC_KEY(family)));
psa_set_key_bits(attributes, bits);
psa_set_key_algorithm(attributes, alg);
break;
}
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
case MBEDTLS_PK_RSA_ALT:
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
case MBEDTLS_PK_OPAQUE:
{
psa_key_attributes_t old_attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
status = psa_get_key_attributes(pk->priv_id, &old_attributes);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_key_type_t old_type = psa_get_key_type(&old_attributes);
switch (usage) {
case PSA_KEY_USAGE_SIGN_MESSAGE:
case PSA_KEY_USAGE_SIGN_HASH:
case PSA_KEY_USAGE_VERIFY_MESSAGE:
case PSA_KEY_USAGE_VERIFY_HASH:
if (!(PSA_KEY_TYPE_IS_ECC_KEY_PAIR(old_type) ||
old_type == PSA_KEY_TYPE_RSA_KEY_PAIR)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
break;
case PSA_KEY_USAGE_DECRYPT:
case PSA_KEY_USAGE_ENCRYPT:
if (old_type != PSA_KEY_TYPE_RSA_KEY_PAIR) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
break;
case PSA_KEY_USAGE_DERIVE:
if (!(PSA_KEY_TYPE_IS_ECC_KEY_PAIR(old_type))) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
break;
default:
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
psa_key_type_t new_type = old_type;
/* Opaque keys are always key pairs, so we don't need a check
* on the input if the required usage is private. We just need
* to adjust the type correctly if the required usage is public. */
if (!want_private) {
new_type = PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(new_type);
}
more_usage = psa_get_key_usage_flags(&old_attributes);
if ((usage & more_usage) == 0) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
psa_set_key_type(attributes, new_type);
psa_set_key_bits(attributes, psa_get_key_bits(&old_attributes));
psa_set_key_algorithm(attributes, psa_get_key_algorithm(&old_attributes));
break;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
default:
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_usage_flags(attributes, more_usage);
/* Key's enrollment is available only when an Mbed TLS implementation of PSA
* Crypto is being used, i.e. when MBEDTLS_PSA_CRYPTO_C is defined.
* Even though we don't officially support using other implementations of PSA
* Crypto with TLS and X.509 (yet), we try to keep vendor's customizations
* separated. */
#if defined(MBEDTLS_PSA_CRYPTO_C)
psa_set_key_enrollment_algorithm(attributes, PSA_ALG_NONE);
#endif
return 0;
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) || defined(MBEDTLS_USE_PSA_CRYPTO)
static psa_status_t export_import_into_psa(mbedtls_svc_key_id_t old_key_id,
const psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t *new_key_id)
{
unsigned char key_buffer[PSA_EXPORT_KEY_PAIR_MAX_SIZE];
size_t key_length = 0;
psa_status_t status = psa_export_key(old_key_id,
key_buffer, sizeof(key_buffer),
&key_length);
if (status != PSA_SUCCESS) {
return status;
}
status = psa_import_key(attributes, key_buffer, key_length, new_key_id);
mbedtls_platform_zeroize(key_buffer, key_length);
return status;
}
static int copy_into_psa(mbedtls_svc_key_id_t old_key_id,
const psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t *new_key_id)
{
/* Normally, we prefer copying: it's more efficient and works even
* for non-exportable keys. */
psa_status_t status = psa_copy_key(old_key_id, attributes, new_key_id);
if (status == PSA_ERROR_NOT_PERMITTED /*missing COPY usage*/ ||
status == PSA_ERROR_INVALID_ARGUMENT /*incompatible policy*/) {
/* There are edge cases where copying won't work, but export+import
* might:
* - If the old key does not allow PSA_KEY_USAGE_COPY.
* - If the old key's usage does not allow what attributes wants.
* Because the key was intended for use in the pk module, and may
* have had a policy chosen solely for what pk needs rather than
* based on a detailed understanding of PSA policies, we are a bit
* more liberal than psa_copy_key() here.
*/
/* Here we need to check that the types match, otherwise we risk
* importing nonsensical data. */
psa_key_attributes_t old_attributes = PSA_KEY_ATTRIBUTES_INIT;
status = psa_get_key_attributes(old_key_id, &old_attributes);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_key_type_t old_type = psa_get_key_type(&old_attributes);
psa_reset_key_attributes(&old_attributes);
if (old_type != psa_get_key_type(attributes)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
status = export_import_into_psa(old_key_id, attributes, new_key_id);
}
return PSA_PK_TO_MBEDTLS_ERR(status);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA || MBEDTLS_USE_PSA_CRYPTO */
static int import_pair_into_psa(const mbedtls_pk_context *pk,
const psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t *key_id)
{
switch (mbedtls_pk_get_type(pk)) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
{
if (psa_get_key_type(attributes) != PSA_KEY_TYPE_RSA_KEY_PAIR) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
unsigned char key_buffer[
PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS)];
unsigned char *const key_end = key_buffer + sizeof(key_buffer);
unsigned char *key_data = key_end;
int ret = mbedtls_rsa_write_key(mbedtls_pk_rsa(*pk),
key_buffer, &key_data);
if (ret < 0) {
return ret;
}
size_t key_length = key_end - key_data;
ret = PSA_PK_TO_MBEDTLS_ERR(psa_import_key(attributes,
key_data, key_length,
key_id));
mbedtls_platform_zeroize(key_data, key_length);
return ret;
}
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
case MBEDTLS_PK_ECKEY:
case MBEDTLS_PK_ECKEY_DH:
case MBEDTLS_PK_ECDSA:
{
/* We need to check the curve family, otherwise the import could
* succeed with nonsensical data.
* We don't check the bit-size: it's optional in attributes,
* and if it's specified, psa_import_key() will know from the key
* data length and will check that the bit-size matches. */
psa_key_type_t to_type = psa_get_key_type(attributes);
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
psa_ecc_family_t from_family = pk->ec_family;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
const mbedtls_ecp_keypair *ec = mbedtls_pk_ec_ro(*pk);
size_t from_bits = 0;
psa_ecc_family_t from_family = mbedtls_ecc_group_to_psa(ec->grp.id,
&from_bits);
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
if (to_type != PSA_KEY_TYPE_ECC_KEY_PAIR(from_family)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
if (mbedtls_svc_key_id_is_null(pk->priv_id)) {
/* We have a public key and want a key pair. */
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
return copy_into_psa(pk->priv_id, attributes, key_id);
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
if (ec->d.n == 0) {
/* Private key not set. Assume the input is a public key only.
* (The other possibility is that it's an incomplete object
* where the group is set but neither the public key nor
* the private key. This is not possible through ecp.h
* functions, so we don't bother reporting a more suitable
* error in that case.) */
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
unsigned char key_buffer[PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS)];
size_t key_length = 0;
int ret = mbedtls_ecp_write_key_ext(ec, &key_length,
key_buffer, sizeof(key_buffer));
if (ret < 0) {
return ret;
}
ret = PSA_PK_TO_MBEDTLS_ERR(psa_import_key(attributes,
key_buffer, key_length,
key_id));
mbedtls_platform_zeroize(key_buffer, key_length);
return ret;
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
}
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
case MBEDTLS_PK_OPAQUE:
return copy_into_psa(pk->priv_id, attributes, key_id);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
default:
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
}
static int import_public_into_psa(const mbedtls_pk_context *pk,
const psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t *key_id)
{
psa_key_type_t psa_type = psa_get_key_type(attributes);
#if defined(MBEDTLS_RSA_C) || \
(defined(MBEDTLS_PK_HAVE_ECC_KEYS) && !defined(MBEDTLS_PK_USE_PSA_EC_DATA)) || \
defined(MBEDTLS_USE_PSA_CRYPTO)
unsigned char key_buffer[PSA_EXPORT_PUBLIC_KEY_MAX_SIZE];
#endif
unsigned char *key_data = NULL;
size_t key_length = 0;
switch (mbedtls_pk_get_type(pk)) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
{
if (psa_type != PSA_KEY_TYPE_RSA_PUBLIC_KEY) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
unsigned char *const key_end = key_buffer + sizeof(key_buffer);
key_data = key_end;
int ret = mbedtls_rsa_write_pubkey(mbedtls_pk_rsa(*pk),
key_buffer, &key_data);
if (ret < 0) {
return ret;
}
key_length = (size_t) ret;
break;
}
#endif /*MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
case MBEDTLS_PK_ECKEY:
case MBEDTLS_PK_ECKEY_DH:
case MBEDTLS_PK_ECDSA:
{
/* We need to check the curve family, otherwise the import could
* succeed with nonsensical data.
* We don't check the bit-size: it's optional in attributes,
* and if it's specified, psa_import_key() will know from the key
* data length and will check that the bit-size matches. */
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
if (psa_type != PSA_KEY_TYPE_ECC_PUBLIC_KEY(pk->ec_family)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
key_data = (unsigned char *) pk->pub_raw;
key_length = pk->pub_raw_len;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
const mbedtls_ecp_keypair *ec = mbedtls_pk_ec_ro(*pk);
size_t from_bits = 0;
psa_ecc_family_t from_family = mbedtls_ecc_group_to_psa(ec->grp.id,
&from_bits);
if (psa_type != PSA_KEY_TYPE_ECC_PUBLIC_KEY(from_family)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
int ret = mbedtls_ecp_write_public_key(
ec, MBEDTLS_ECP_PF_UNCOMPRESSED,
&key_length, key_buffer, sizeof(key_buffer));
if (ret < 0) {
return ret;
}
key_data = key_buffer;
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
break;
}
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
case MBEDTLS_PK_OPAQUE:
{
psa_key_attributes_t old_attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_status_t status =
psa_get_key_attributes(pk->priv_id, &old_attributes);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_key_type_t old_type = psa_get_key_type(&old_attributes);
psa_reset_key_attributes(&old_attributes);
if (psa_type != PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(old_type)) {
return MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
status = psa_export_public_key(pk->priv_id,
key_buffer, sizeof(key_buffer),
&key_length);
if (status != PSA_SUCCESS) {
return PSA_PK_TO_MBEDTLS_ERR(status);
}
key_data = key_buffer;
break;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
default:
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return PSA_PK_TO_MBEDTLS_ERR(psa_import_key(attributes,
key_data, key_length,
key_id));
}
int mbedtls_pk_import_into_psa(const mbedtls_pk_context *pk,
const psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t *key_id)
{
/* Set the output immediately so that it won't contain garbage even
* if we error out before calling psa_import_key(). */
*key_id = MBEDTLS_SVC_KEY_ID_INIT;
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_RSA_ALT) {
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
int want_public = PSA_KEY_TYPE_IS_PUBLIC_KEY(psa_get_key_type(attributes));
if (want_public) {
return import_public_into_psa(pk, attributes, key_id);
} else {
return import_pair_into_psa(pk, attributes, key_id);
}
}
static int copy_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk,
int public_only)
{
psa_status_t status;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
size_t key_bits;
/* Use a buffer size large enough to contain either a key pair or public key. */
unsigned char exp_key[PSA_EXPORT_KEY_PAIR_OR_PUBLIC_MAX_SIZE];
size_t exp_key_len;
int ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
if (pk == NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
status = psa_get_key_attributes(key_id, &key_attr);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if (public_only) {
status = psa_export_public_key(key_id, exp_key, sizeof(exp_key), &exp_key_len);
} else {
status = psa_export_key(key_id, exp_key, sizeof(exp_key), &exp_key_len);
}
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto exit;
}
key_type = psa_get_key_type(&key_attr);
if (public_only) {
key_type = PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(key_type);
}
key_bits = psa_get_key_bits(&key_attr);
#if defined(MBEDTLS_RSA_C)
if ((key_type == PSA_KEY_TYPE_RSA_KEY_PAIR) ||
(key_type == PSA_KEY_TYPE_RSA_PUBLIC_KEY)) {
ret = mbedtls_pk_setup(pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA));
if (ret != 0) {
goto exit;
}
if (key_type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
ret = mbedtls_rsa_parse_key(mbedtls_pk_rsa(*pk), exp_key, exp_key_len);
} else {
ret = mbedtls_rsa_parse_pubkey(mbedtls_pk_rsa(*pk), exp_key, exp_key_len);
}
if (ret != 0) {
goto exit;
}
psa_algorithm_t alg_type = psa_get_key_algorithm(&key_attr);
mbedtls_md_type_t md_type = MBEDTLS_MD_NONE;
if (PSA_ALG_GET_HASH(alg_type) != PSA_ALG_ANY_HASH) {
md_type = mbedtls_md_type_from_psa_alg(alg_type);
}
if (PSA_ALG_IS_RSA_OAEP(alg_type) || PSA_ALG_IS_RSA_PSS(alg_type)) {
ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(*pk), MBEDTLS_RSA_PKCS_V21, md_type);
} else if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg_type) ||
alg_type == PSA_ALG_RSA_PKCS1V15_CRYPT) {
ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(*pk), MBEDTLS_RSA_PKCS_V15, md_type);
}
if (ret != 0) {
goto exit;
}
} else
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type) ||
PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY(key_type)) {
mbedtls_ecp_group_id grp_id;
ret = mbedtls_pk_setup(pk, mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY));
if (ret != 0) {
goto exit;
}
grp_id = mbedtls_ecc_group_from_psa(PSA_KEY_TYPE_ECC_GET_FAMILY(key_type), key_bits);
ret = mbedtls_pk_ecc_set_group(pk, grp_id);
if (ret != 0) {
goto exit;
}
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type)) {
ret = mbedtls_pk_ecc_set_key(pk, exp_key, exp_key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_pk_ecc_set_pubkey_from_prv(pk, exp_key, exp_key_len,
mbedtls_psa_get_random,
MBEDTLS_PSA_RANDOM_STATE);
} else {
ret = mbedtls_pk_ecc_set_pubkey(pk, exp_key, exp_key_len);
}
if (ret != 0) {
goto exit;
}
} else
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
{
(void) key_bits;
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
exit:
psa_reset_key_attributes(&key_attr);
mbedtls_platform_zeroize(exp_key, sizeof(exp_key));
return ret;
}
int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk)
{
return copy_from_psa(key_id, pk, 0);
}
int mbedtls_pk_copy_public_from_psa(mbedtls_svc_key_id_t key_id,
mbedtls_pk_context *pk)
{
return copy_from_psa(key_id, pk, 1);
}
#endif /* MBEDTLS_PSA_CRYPTO_CLIENT */
/*
* Helper for mbedtls_pk_sign and mbedtls_pk_verify
*/
static inline int pk_hashlen_helper(mbedtls_md_type_t md_alg, size_t *hash_len)
{
if (*hash_len != 0) {
return 0;
}
*hash_len = mbedtls_md_get_size_from_type(md_alg);