-
Notifications
You must be signed in to change notification settings - Fork 5
/
encrypt_cryptoapi.c
1147 lines (1022 loc) · 29.5 KB
/
encrypt_cryptoapi.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
/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. [email protected]
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the copyright holder
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "uftp_common.h"
#include "encryption.h"
#define MAXLIST 100
#define BLOBLEN 1000
struct private_key_list_t {
HCRYPTPROV provider;
HCRYPTKEY key;
};
struct key_list_t {
char keystr[MAXKEY];
int keylen;
HCRYPTKEY mskey;
};
static const struct keyinfo_t {
ALG_ID alg;
int keysize;
int blocksize;
} keyinfo[] = {
{ CALG_DES, 8, 8 },
{ CALG_3DES, 24, 8 },
#ifdef CALG_AES_128
{ CALG_AES_128, 16, 16 },
#endif
#ifdef CALG_AES_256
{ CALG_AES_256, 32, 16}
#endif
};
static const struct hashinfo_t {
ALG_ID alg;
int hashsize;
} hashinfo[] = {
{ CALG_MD5, 16 },
{ CALG_SHA1, 20 },
#ifdef CALG_SHA_256
{ CALG_SHA_256, 32 }
#endif
};
// The CSP used for all non-signing operations
static HCRYPTPROV base_prov;
// The provider type of the best available CSP
static DWORD prov_type;
// Since using an RSA key for signing must be done via the provider and
// not directly with the key, each is in its own key container with its
// own separate provider. The user passes in the key to sign with, and this
// list matches the key with the provider that has access to it for signing.
static struct private_key_list_t private_key_list[MAXLIST];
// Since symmetric keys and hmac keys get an HCRYPTKEY associated with them,
// the first time the user wants to use a key a HCRYPTKEY is created. Then
// on subsequent uses the associated HCRYPTKEY is looked up so it doesn't
// have to be created and destroyed every time it's used.
static struct key_list_t symmetric_keys[MAXLIST], hmac_keys[MAXLIST];
static int machine_keyset = 0;
/**
* Prints Microsoft specific error messages to log
*/
static void mserror(const char *str)
{
char errbuf[300];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
0, errbuf, sizeof(errbuf), NULL);
clog0(0, 0, 0, "%s: (0x%08X) %s", str, GetLastError(), errbuf);
}
static int init_done = 0;
/**
* Performs all necessary steps to initialize the crypto library
*/
void crypto_init(int set_sys_key)
{
DWORD tmp_prov_type, name_len;
int cnt, found_aes, i;
// First see if we have an AES capable provider.
// If so, use that, otherwise use one without.
#ifdef PROV_RSA_AES
found_aes = 0;
cnt = 0;
name_len = 0;
while (CryptEnumProviderTypes(cnt, 0, 0, &tmp_prov_type, NULL, &name_len) &&
(!found_aes)) {
if (tmp_prov_type == PROV_RSA_AES) {
found_aes = 1;
}
cnt++;
name_len = 0;
}
if ((!found_aes) && (GetLastError() != ERROR_NO_MORE_ITEMS)) {
mserror("CryptEnumProviderTypes failed");
exit(ERR_CRYPTO);
}
prov_type = (found_aes ? PROV_RSA_AES : PROV_RSA_FULL);
#else
prov_type = PROV_RSA_FULL;
#endif
if (set_sys_key) {
machine_keyset = CRYPT_MACHINE_KEYSET;
} else {
machine_keyset = 0;
}
if (!CryptAcquireContext(&base_prov, NULL, NULL, prov_type,
CRYPT_VERIFYCONTEXT | machine_keyset)) {
mserror("CryptAcquireContext failed");
exit(ERR_CRYPTO);
}
for (i = 0; i < MAXLIST; i++) {
memset(&private_key_list[i], 0, sizeof(private_key_list[i]));
memset(&symmetric_keys[i], 0, sizeof(symmetric_keys[i]));
memset(&hmac_keys[i], 0, sizeof(hmac_keys[i]));
}
init_done = 1;
}
/**
* Performs all necessary steps to clean up the crypto library
*/
void crypto_cleanup(void)
{
int i;
if (!init_done) {
return;
}
for (i = 0; i < MAXLIST; i++) {
if (private_key_list[i].provider != 0) {
// Cleanup of private (and public) keys should be done by caller,
// since they have a handle to the key under CryptoAPI and OpenSSL
if (!CryptReleaseContext(private_key_list[i].provider, 0)) {
mserror("CryptReleaseContext failed");
}
}
if (symmetric_keys[i].keylen != 0) {
if (!CryptDestroyKey(symmetric_keys[i].mskey)) {
mserror("CryptDestroyKey failed");
}
}
if (hmac_keys[i].keylen != 0) {
if (!CryptDestroyKey(hmac_keys[i].mskey)) {
mserror("CryptDestroyKey failed");
}
}
}
if (!CryptReleaseContext(base_prov, 0)) {
mserror("CryptReleaseContext failed");
}
}
/**
* Returns the next key container for the current user
*/
const char *get_next_container(void)
{
static int flag = CRYPT_FIRST;
static char *item = NULL;
static int mlen = 0;
int rval, len;
if (flag == CRYPT_FIRST) {
rval = CryptGetProvParam(base_prov, PP_ENUMCONTAINERS, NULL,
&mlen, CRYPT_FIRST);
if (!rval) {
return NULL;
}
item = safe_malloc(mlen);
}
len = mlen;
rval = CryptGetProvParam(base_prov, PP_ENUMCONTAINERS, item, &len, flag);
if (!rval) {
if (GetLastError() != ERROR_NO_MORE_ITEMS) {
mserror("CryptGetProvParam failed");
}
flag = CRYPT_FIRST;
free(item);
item = NULL;
return NULL;
}
flag = CRYPT_NEXT;
return item;
}
/**
* Deletes the key container with the given name
*/
void delete_container(const char *name)
{
HCRYPTPROV prov;
if (!CryptAcquireContext(&prov, name, NULL, prov_type,
CRYPT_DELETEKEYSET | machine_keyset)) {
mserror("CryptAcquireContext for delete failed");
}
}
/**
* Returns the ALG_ID associated with a given keytype
*/
static ALG_ID get_cipher(int keytype)
{
switch (keytype) {
case KEY_DES:
return CALG_DES;
case KEY_DES_EDE3:
return CALG_3DES;
case KEY_AES128_CBC:
#ifdef CALG_AES_128
return CALG_AES_128;
#else
return 0;
#endif
case KEY_AES256_CBC:
#ifdef CALG_AES_256
return CALG_AES_256;
#else
return 0;
#endif
case KEY_AES128_GCM:
case KEY_AES256_GCM:
case KEY_AES128_CCM:
case KEY_AES256_CCM:
// Not supported by CryptoAPI
return 0;
default:
log0(0, 0, 0, "Unknown keytype: %d", keytype);
return 0;
}
}
/**
* Returns the ALG_ID associated with a given hashtype
*/
static ALG_ID get_hash(int hashtype)
{
switch (hashtype) {
case HASH_SHA256:
#ifdef CALG_SHA_256
return CALG_SHA_256;
#else
return 0;
#endif
case HASH_SHA1:
return CALG_SHA1;
case HASH_MD5:
return CALG_MD5;
default:
log0(0, 0, 0, "Unknown hashtype: %d", hashtype);
return 0;
}
}
/**
* Returns whether a particular ALG_ID is available in the current CSP
*/
static int alg_found(ALG_ID alg)
{
PROV_ENUMALGS alg_info;
int alg_info_len, flag, found_alg;
found_alg = 0;
alg_info_len = sizeof(alg_info);
flag = CRYPT_FIRST;
while (CryptGetProvParam(base_prov, PP_ENUMALGS, (BYTE *)&alg_info,
&alg_info_len, flag) && (!found_alg)) {
if (alg_info.aiAlgid == alg) {
found_alg = 1;
}
alg_info_len = sizeof(alg_info);
flag = CRYPT_NEXT;
}
if (!found_alg) {
if (GetLastError() != ERROR_NO_MORE_ITEMS) {
mserror("CryptGetProvParam failed");
}
return 0;
} else {
return 1;
}
}
/**
* Returns whether a particular cipher is supported
*/
int cipher_supported(int keytype)
{
ALG_ID alg;
if ((alg = get_cipher(keytype)) == 0) {
return 0;
}
return alg_found(alg);
}
/**
* Returns whether a particular hash is supported
*/
int hash_supported(int hashtype)
{
ALG_ID alg;
if ((alg = get_hash(hashtype)) == 0) {
return 0;
}
return alg_found(alg);
}
/**
* Gets the key length and IV/block length of a given key
*/
void get_key_info(int keytype, int *keylen, int *ivlen)
{
ALG_ID alg;
int numkeys, i;
alg = get_cipher(keytype);
numkeys = sizeof(keyinfo) / sizeof(struct keyinfo_t);
for (i = 0; i < numkeys; i++) {
if (alg == keyinfo[i].alg) {
*keylen = keyinfo[i].keysize;
*ivlen = keyinfo[i].blocksize;
return;
}
}
*keylen = 0;
*ivlen = 0;
}
/**
* Gets the length of the given hash
*/
int get_hash_len(int hashtype)
{
ALG_ID alg;
int numhash, i;
alg = get_hash(hashtype);
numhash = sizeof(hashinfo) / sizeof(struct hashinfo_t);
for (i = 0; i < numhash; i++) {
if (alg == hashinfo[i].alg) {
return hashinfo[i].hashsize;
}
}
return 0;
}
/**
* Gets num cryptographically random bytes
*/
int get_random_bytes(unsigned char *buf, int num)
{
int rval;
if (!(rval = CryptGenRandom(base_prov, num, buf))) {
mserror("Error getting random bytes");
}
return rval;
}
/**
* Takes a block of data and encrypts it with a symmetric cypher.
* The output buffer must be at least the size of source data + block size.
*/
int encrypt_block(int keytype, const unsigned char *IV,
const unsigned char *key,
const unsigned char *aad, unsigned int aadlen,
const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
// TODO: right now we reimport the key each time. Test to see if this
// is quick enough or if we need to cache an imported key.
HCRYPTKEY hckey;
char keyblob[BLOBLEN];
BLOBHEADER *bheader;
DWORD *keysize;
BYTE *keydata;
int bloblen, keylen, ivlen, rval;
ALG_ID alg;
DWORD mode, _destlen;
get_key_info(keytype, &keylen, &ivlen);
alg = get_cipher(keytype);
if (alg == 0) {
log0(0, 0, 0, "Invalid keytype");
return 0;
}
bheader = (BLOBHEADER *)keyblob;
keysize = (DWORD *)(keyblob + sizeof(BLOBHEADER));
keydata = (BYTE *)((char *)keysize + sizeof(DWORD));
memset(keyblob, 0, sizeof(keyblob));
bheader->bType = PLAINTEXTKEYBLOB;
bheader->bVersion = CUR_BLOB_VERSION;
bheader->aiKeyAlg = alg;
*keysize = keylen;
memcpy(keydata, key, keylen);
bloblen = sizeof(BLOBHEADER) + sizeof(DWORD) + keylen;
if (!CryptImportKey(base_prov, keyblob, bloblen, 0, 0, &hckey)) {
mserror("CryptImportKey failed");
return 0;
}
mode = CRYPT_MODE_CBC;
if (!CryptSetKeyParam(hckey, KP_MODE, (BYTE *)&mode, 0)) {
mserror("CryptSetKeyParam failed on KP_MODE");
rval = 0;
goto end;
}
if (!CryptSetKeyParam(hckey, KP_IV, IV, 0)) {
mserror("CryptSetKeyParam failed on KP_IV");
rval = 0;
goto end;
}
memcpy(dest, src, srclen);
_destlen = srclen;
if (!CryptEncrypt(hckey, 0, 1, 0, dest, &_destlen, srclen + ivlen)) {
mserror("CryptEncrypt failed");
rval = 0;
goto end;
}
*destlen = _destlen;
rval = 1;
end:
if (!CryptDestroyKey(hckey)) {
mserror("CryptDestroyKey failed");
}
return rval;
}
/**
* Takes a block of data encrypted with a symmetric cypher and decrypts it.
* The output buffer must be at least the size of source data.
*/
int decrypt_block(int keytype, const unsigned char *IV,
const unsigned char *key,
const unsigned char *aad, unsigned int aadlen,
unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
// TODO: right now we reimport the key each time. Test to see if this
// is quick enough or if we need to cache an imported key.
HCRYPTKEY hckey;
char keyblob[BLOBLEN];
BLOBHEADER *bheader;
DWORD *keysize;
BYTE *keydata;
int bloblen, keylen, ivlen, rval;
ALG_ID alg;
DWORD mode, _destlen;
get_key_info(keytype, &keylen, &ivlen);
alg = get_cipher(keytype);
if (alg == 0) {
log0(0, 0, 0, "Invalid keytype");
return 0;
}
bheader = (BLOBHEADER *)keyblob;
keysize = (DWORD *)(keyblob + sizeof(BLOBHEADER));
keydata = (BYTE *)((char *)keysize + sizeof(DWORD));
memset(keyblob, 0, sizeof(keyblob));
bheader->bType = PLAINTEXTKEYBLOB;
bheader->bVersion = CUR_BLOB_VERSION;
bheader->aiKeyAlg = alg;
*keysize = keylen;
memcpy(keydata, key, keylen);
bloblen = sizeof(BLOBHEADER) + sizeof(DWORD) + keylen;
if (!CryptImportKey(base_prov, keyblob, bloblen, 0, 0, &hckey)) {
mserror("CryptImportKey failed");
return 0;
}
mode = CRYPT_MODE_CBC;
if (!CryptSetKeyParam(hckey, KP_MODE, (BYTE *)&mode, 0)) {
mserror("CryptSetKeyParam failed on KP_MODE");
rval = 0;
goto end;
}
if (!CryptSetKeyParam(hckey, KP_IV, IV, 0)) {
mserror("CryptSetKeyParam failed on KP_IV");
rval = 0;
goto end;
}
memcpy(dest, src, srclen);
_destlen = srclen;
if (!CryptDecrypt(hckey, 0, 1, 0, dest, &_destlen)) {
mserror("CryptDecrypt failed");
rval = 0;
goto end;
}
*destlen = _destlen;
rval = 1;
end:
if (!CryptDestroyKey(hckey)) {
mserror("CryptDestroyKey failed");
}
return rval;
}
/**
* Calculates the HMAC of the given message, hashtype, and hashkey.
* dest must be at least the hash length.
*/
int create_hmac(int hashtype, const unsigned char *key, unsigned int keylen,
const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
// TODO: right now we reimport the hmac key each time. Test to see if this
// is quick enough or if we need to cache an imported hmac key.
HCRYPTKEY hmackey;
HCRYPTHASH hash;
char keyblob[BLOBLEN];
BLOBHEADER *bheader;
DWORD *keysize;
BYTE *keydata;
HMAC_INFO info;
ALG_ID alg;
int bloblen, hashlen, rval;
DWORD _destlen;
hashlen = get_hash_len(hashtype);
alg = get_hash(hashtype);
if (alg == 0) {
log0(0, 0, 0, "Invalid hashtype");
return 0;
}
bheader = (BLOBHEADER *)keyblob;
keysize = (DWORD *)(keyblob + sizeof(BLOBHEADER));
keydata = (BYTE *)((char *)keysize + sizeof(DWORD));
memset(keyblob, 0, sizeof(keyblob));
bheader->bType = PLAINTEXTKEYBLOB;
bheader->bVersion = CUR_BLOB_VERSION;
bheader->aiKeyAlg = CALG_RC2;
*keysize = keylen;
memcpy(keydata, key, keylen);
bloblen = sizeof(BLOBHEADER) + sizeof(DWORD) + hashlen;
if (!CryptImportKey(base_prov, keyblob, bloblen, 0,
CRYPT_IPSEC_HMAC_KEY, &hmackey)) {
mserror("CryptImportKey failed");
return 0;
}
if (!CryptCreateHash(base_prov, CALG_HMAC, hmackey, 0, &hash)) {
mserror("CryptCreateHash failed");
rval = 0;
goto end1;
}
memset(&info, 0, sizeof(info));
info.HashAlgid = alg;
if (!CryptSetHashParam(hash, HP_HMAC_INFO, (BYTE *)&info, 0)) {
mserror("CryptSetHashParam failed");
rval = 0;
goto end2;
}
if (!CryptHashData(hash, src, srclen, 0)) {
mserror("CryptHashData failed");
rval = 0;
goto end2;
}
_destlen = hashlen;
if (!CryptGetHashParam(hash, HP_HASHVAL, dest, &_destlen, 0)) {
mserror("CryptGetHashParam failed");
rval = 0;
goto end2;
}
*destlen = _destlen;
rval = 1;
end2:
if (!CryptDestroyHash(hash)) {
mserror("CryptDestroyHash failed");
}
end1:
if (!CryptDestroyKey(hmackey)) {
mserror("CryptDestroyKey failed");
}
return rval;
}
/**
* Calculates the hash of the given message and hashtype
*/
int hash(int hashtype, const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
HCRYPTHASH hash;
ALG_ID alg;
int hashlen, rval;
DWORD _destlen;
hashlen = get_hash_len(hashtype);
alg = get_hash(hashtype);
if (alg == 0) {
log0(0, 0, 0, "Invalid hashtype");
return 0;
}
if (!CryptCreateHash(base_prov, alg, 0, 0, &hash)) {
mserror("CryptCreateHash failed");
return 0;
}
if (!CryptHashData(hash, src, srclen, 0)) {
mserror("CryptHashData failed");
rval = 0;
goto end;
}
_destlen = hashlen;
if (!CryptGetHashParam(hash, HP_HASHVAL, dest, &_destlen, 0)) {
mserror("CryptGetHashParam failed");
rval = 0;
goto end;
}
*destlen = _destlen;
rval = 1;
end:
if (!CryptDestroyHash(hash)) {
mserror("CryptDestroyHash failed");
}
return rval;
}
/**
* Returns the length in bytes of the modulus for the given RSA key
*/
int RSA_keylen(const RSA_key_t rsa)
{
DWORD keylen, bsize;
bsize = sizeof(keylen);
if (!CryptGetKeyParam(rsa, KP_KEYLEN, (BYTE *)&keylen, &bsize, 0)) {
mserror("CryptGetKeyParam failed");
return 0;
}
return keylen / 8;
}
int EC_keylen(const EC_key_t ec)
{
log0(0, 0, 0, "EC not supported");
return 0;
}
int ECDSA_siglen(const EC_key_t ec)
{
log0(0, 0, 0, "ECDSA not supported");
return 0;
}
/**
* Encrypts a small block of data with an RSA public key.
* Output buffer must be at least the key size.
*/
int RSA_encrypt(RSA_key_t rsa, const unsigned char *from, unsigned int fromlen,
unsigned char *to, unsigned int *tolen)
{
DWORD _tolen;
int flags;
unsigned int i;
unsigned char *outbuf;
if (RSA_keylen(rsa) * 8 < 768) {
flags = 0;
} else {
flags = CRYPT_OAEP;
}
outbuf = safe_calloc(RSA_keylen(rsa), 1);
memcpy(outbuf, from, fromlen);
_tolen = fromlen;
if (!CryptEncrypt(rsa, 0, 1, flags, outbuf, &_tolen, RSA_keylen(rsa))) {
mserror("CryptEncrypt failed");
free(outbuf);
return 0;
}
*tolen = _tolen;
// CryptoAPI returns ciphertext in little endian, so reverse the bytes
for (i = 0; i < _tolen; i++) {
to[i] = outbuf[_tolen - i - 1];
}
free(outbuf);
return 1;
}
/**
* Decrypts a small block of data with an RSA private key.
*/
int RSA_decrypt(RSA_key_t rsa, const unsigned char *from, unsigned int fromlen,
unsigned char *to, unsigned int *tolen)
{
DWORD _tolen;
int flags;
unsigned int i;
if (RSA_keylen(rsa) * 8 < 768) {
flags = 0;
} else {
flags = CRYPT_OAEP;
}
// CryptoAPI expects ciphertext in little endian, so reverse the bytes
for (i = 0; i < fromlen; i++) {
to[i] = from[fromlen - i - 1];
}
_tolen = fromlen;
if (!CryptDecrypt(rsa, 0, 1, flags, to, &_tolen)) {
mserror("CryptDecrypt failed");
return 0;
}
*tolen = _tolen;
return 1;
}
/**
* Hashes a block of data and signs it with an RSA private key.
* Output buffer must be at least the key size.
*/
int create_RSA_sig(RSA_key_t rsa, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int *siglen)
{
HCRYPTHASH hash;
DWORD _siglen;
int idx, found;
ALG_ID alg;
int hashlen, rval;
unsigned int i;
unsigned char *outsig;
for (idx = 0, found = 0; (idx < MAXLIST) && (!found); idx++) {
if (private_key_list[idx].key == rsa) {
found = 1;
}
}
if (!found) {
log0(0, 0, 0, "Couldn't find provider for RSA key");
return 0;
}
idx--;
hashlen = get_hash_len(hashtype);
alg = get_hash(hashtype);
if (alg == 0) {
log0(0, 0, 0, "Invalid hashtype");
return 0;
}
if (!CryptCreateHash(private_key_list[idx].provider, alg, 0, 0, &hash)) {
mserror("CryptCreateHash failed");
return 0;
}
if (!CryptHashData(hash, mes, meslen, 0)) {
mserror("CryptHashData failed");
rval = 0;
goto end;
}
_siglen = RSA_keylen(rsa);
outsig = safe_calloc(_siglen, 1);
if (!CryptSignHash(hash, AT_KEYEXCHANGE, NULL, 0, outsig, &_siglen)) {
mserror("CryptSignHash failed");
free(outsig);
rval = 0;
goto end;
}
*siglen = _siglen;
// CryptoAPI returns signatures in little endian, so reverse the bytes
for (i = 0; i < _siglen; i++) {
sig[i] = outsig[_siglen - i - 1];
}
free(outsig);
rval = 1;
end:
if (!CryptDestroyHash(hash)) {
mserror("CryptDestroyHash failed");
}
return rval;
}
/**
* Hashes a block of data and verifies it against an RSA signature.
*/
int verify_RSA_sig(RSA_key_t rsa, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int siglen)
{
HCRYPTHASH hash;
ALG_ID alg;
unsigned hashlen, i;
int rval;
unsigned char *insig;
hashlen = get_hash_len(hashtype);
alg = get_hash(hashtype);
if (alg == 0) {
log0(0, 0, 0, "Invalid hashtype");
return 0;
}
if (!CryptCreateHash(base_prov, alg, 0, 0, &hash)) {
mserror("CryptCreateHash failed");
return 0;
}
if (!CryptHashData(hash, mes, meslen, 0)) {
mserror("CryptHashData failed");
rval = 0;
goto end;
}
insig = safe_calloc(siglen, 1);
// CryptoAPI expects signatures in little endian, so reverse the bytes
for (i = 0; i < siglen; i++) {
insig[i] = sig[siglen - i - 1];
}
if (!CryptVerifySignature(hash, insig, siglen, rsa, NULL, 0)) {
mserror("CryptVerifySignature failed");
free(insig);
rval = 0;
goto end;
}
free(insig);
rval = 1;
end:
if (!CryptDestroyHash(hash)) {
mserror("CryptDestroyHash failed");
}
return rval;
}
int create_ECDSA_sig(EC_key_t rsa, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int *siglen)
{
log0(0, 0, 0, "ECDSA not supported");
return 0;
}
int verify_ECDSA_sig(EC_key_t ec, int hashtype,
const unsigned char *mes, unsigned int meslen,
const unsigned char *sig, unsigned int siglen)
{
log0(0, 0, 0, "ECDSA not supported");
return 0;
}
int get_ECDH_key(EC_key_t pubkey, EC_key_t privkey, unsigned char *key,
unsigned int *keylen)
{
log0(0, 0, 0, "ECDH not supported");
return 0;
}
/**
* Creates an RSA public key with the given modulus and public exponent
*/
int import_RSA_key(RSA_key_t *rsa, const unsigned char *keyblob,
uint16_t bloblen)
{
struct rsa_blob_t *rsablob;
const unsigned char *modulus;
char ms_keyblob[BLOBLEN];
BLOBHEADER *bheader;
RSAPUBKEY *pubkeyheader;
BYTE *ms_blob_modulus;
int ms_bloblen, modlen, i;
rsablob = (struct rsa_blob_t *)keyblob;
modulus = keyblob + sizeof(struct rsa_blob_t);
modlen = ntohs(rsablob->modlen);
if (sizeof(struct rsa_blob_t) + modlen != bloblen) {
log0(0, 0, 0, "Error importing RSA key: invalid length");
return 0;
}
bheader = (BLOBHEADER *)ms_keyblob;
pubkeyheader = (RSAPUBKEY *)(ms_keyblob + sizeof(BLOBHEADER));
ms_blob_modulus = (BYTE *)pubkeyheader + sizeof(RSAPUBKEY);
memset(ms_keyblob, 0, sizeof(ms_keyblob));
bheader->bType = PUBLICKEYBLOB;
bheader->bVersion = CUR_BLOB_VERSION;
bheader->aiKeyAlg = CALG_RSA_KEYX;
pubkeyheader->magic = 0x31415352;
pubkeyheader->bitlen = modlen * 8;
pubkeyheader->pubexp = ntohl(rsablob->exponent);
// CrypoAPI expects the modulus in little endian, so reverse the bytes
for (i = 0; i < modlen; i++) {
ms_blob_modulus[i] = modulus[modlen - i - 1];
}
ms_bloblen = sizeof(BLOBHEADER) + sizeof(RSAPUBKEY) + modlen;
if (!CryptImportKey(base_prov, ms_keyblob, ms_bloblen, 0, 0, rsa)) {
mserror("CryptImportKey failed");
return 0;
}
return 1;
}
/**
* Extracts the modulus and public exponent from an RSA public key
*/
int export_RSA_key(const RSA_key_t rsa, unsigned char *keyblob,
uint16_t *bloblen)
{
struct rsa_blob_t *rsablob;
unsigned char *modulus;
char ms_keyblob[BLOBLEN];
BLOBHEADER *bheader;
RSAPUBKEY *pubkeyheader;
BYTE *ms_blob_modulus;
int ms_bloblen, i;
uint16_t modlen;
rsablob = (struct rsa_blob_t *)keyblob;
modulus = keyblob + sizeof(struct rsa_blob_t);
ms_bloblen = sizeof(ms_keyblob);
if (!CryptExportKey(rsa, 0, PUBLICKEYBLOB, 0, ms_keyblob, &ms_bloblen)) {
mserror("CryptExportKey failed");
return 0;
}
bheader = (BLOBHEADER *)ms_keyblob;
pubkeyheader = (RSAPUBKEY *)(ms_keyblob + sizeof(BLOBHEADER));
ms_blob_modulus = (BYTE *)pubkeyheader + sizeof(RSAPUBKEY);
modlen = (pubkeyheader->bitlen / 8) & 0xFFFF;
rsablob->blobtype = KEYBLOB_RSA;
rsablob->reserved = 0;
rsablob->modlen = htons(modlen);
rsablob->exponent = htonl(pubkeyheader->pubexp);
// CrypoAPI exports the modulus in little endian, so reverse the bytes
for (i = 0; i < modlen; i++) {
modulus[i] = ms_blob_modulus[modlen - i - 1];
}
*bloblen = sizeof(struct rsa_blob_t) + modlen;
return 1;
}