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
|
/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use - SM2 implemetation uses ECDSA_size() function.
*/
#include "internal/deprecated.h"
#include <string.h> /* memcpy */
#include <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "internal/cryptlib.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "crypto/ec.h"
#include "crypto/sm2.h"
#include "prov/der_sm2.h"
static OSSL_FUNC_signature_newctx_fn sm2sig_newctx;
static OSSL_FUNC_signature_sign_init_fn sm2sig_signature_init;
static OSSL_FUNC_signature_verify_init_fn sm2sig_signature_init;
static OSSL_FUNC_signature_sign_fn sm2sig_sign;
static OSSL_FUNC_signature_verify_fn sm2sig_verify;
static OSSL_FUNC_signature_digest_sign_init_fn sm2sig_digest_signverify_init;
static OSSL_FUNC_signature_digest_sign_update_fn sm2sig_digest_signverify_update;
static OSSL_FUNC_signature_digest_sign_final_fn sm2sig_digest_sign_final;
static OSSL_FUNC_signature_digest_verify_init_fn sm2sig_digest_signverify_init;
static OSSL_FUNC_signature_digest_verify_update_fn sm2sig_digest_signverify_update;
static OSSL_FUNC_signature_digest_verify_final_fn sm2sig_digest_verify_final;
static OSSL_FUNC_signature_freectx_fn sm2sig_freectx;
static OSSL_FUNC_signature_dupctx_fn sm2sig_dupctx;
static OSSL_FUNC_signature_get_ctx_params_fn sm2sig_get_ctx_params;
static OSSL_FUNC_signature_gettable_ctx_params_fn sm2sig_gettable_ctx_params;
static OSSL_FUNC_signature_set_ctx_params_fn sm2sig_set_ctx_params;
static OSSL_FUNC_signature_settable_ctx_params_fn sm2sig_settable_ctx_params;
static OSSL_FUNC_signature_get_ctx_md_params_fn sm2sig_get_ctx_md_params;
static OSSL_FUNC_signature_gettable_ctx_md_params_fn sm2sig_gettable_ctx_md_params;
static OSSL_FUNC_signature_set_ctx_md_params_fn sm2sig_set_ctx_md_params;
static OSSL_FUNC_signature_settable_ctx_md_params_fn sm2sig_settable_ctx_md_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes EC structures, so
* we use that here too.
*/
typedef struct {
OSSL_LIB_CTX *libctx;
char *propq;
EC_KEY *ec;
/*
* Flag to determine if the hash function can be changed (1) or not (0)
* Because it's dangerous to change during a DigestSign or DigestVerify
* operation, this flag is cleared by their Init function, and set again
* by their Final function.
*/
unsigned int flag_allow_md : 1;
/*
* Flag to termine if the 'z' digest needs to be computed and fed to the
* hash function.
* This flag should be set on initialization and the compuation should
* be performed only once, on first update.
*/
unsigned int flag_compute_z_digest : 1;
char mdname[OSSL_MAX_NAME_SIZE];
/* The Algorithm Identifier of the combined signature algorithm */
unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
unsigned char *aid;
size_t aid_len;
/* main digest */
EVP_MD *md;
EVP_MD_CTX *mdctx;
size_t mdsize;
/* SM2 ID used for calculating the Z value */
unsigned char *id;
size_t id_len;
} PROV_SM2_CTX;
static void *sm2sig_newctx(void *provctx, const char *propq)
{
PROV_SM2_CTX *ctx = OPENSSL_zalloc(sizeof(PROV_SM2_CTX));
if (ctx == NULL)
return NULL;
ctx->libctx = PROV_LIBCTX_OF(provctx);
if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
OPENSSL_free(ctx);
ctx = NULL;
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
}
/* don't allow to change MD, and in fact there is no such need */
ctx->flag_allow_md = 0;
return ctx;
}
static int sm2sig_signature_init(void *vpsm2ctx, void *ec)
{
PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (psm2ctx == NULL || ec == NULL || !EC_KEY_up_ref(ec))
return 0;
EC_KEY_free(psm2ctx->ec);
psm2ctx->ec = ec;
return 1;
}
static int sm2sig_sign(void *vpsm2ctx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
int ret;
unsigned int sltmp;
/* SM2 uses ECDSA_size as well */
size_t ecsize = ECDSA_size(ctx->ec);
if (sig == NULL) {
*siglen = ecsize;
return 1;
}
if (sigsize < (size_t)ecsize)
return 0;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
ret = sm2_internal_sign(tbs, tbslen, sig, &sltmp, ctx->ec);
if (ret <= 0)
return 0;
*siglen = sltmp;
return 1;
}
static int sm2sig_verify(void *vpsm2ctx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
return sm2_internal_verify(tbs, tbslen, sig, siglen, ctx->ec);
}
static void free_md(PROV_SM2_CTX *ctx)
{
EVP_MD_CTX_free(ctx->mdctx);
EVP_MD_free(ctx->md);
ctx->mdctx = NULL;
ctx->md = NULL;
ctx->mdsize = 0;
}
static int sm2sig_digest_signverify_init(void *vpsm2ctx, const char *mdname,
void *ec)
{
PROV_SM2_CTX *ctx = (PROV_SM2_CTX *)vpsm2ctx;
int md_nid = NID_sm3;
WPACKET pkt;
int ret = 0;
free_md(ctx);
if (!sm2sig_signature_init(vpsm2ctx, ec))
return ret;
ctx->md = EVP_MD_fetch(ctx->libctx, mdname, ctx->propq);
ctx->mdsize = EVP_MD_size(ctx->md);
ctx->mdctx = EVP_MD_CTX_new();
if (ctx->mdctx == NULL)
goto error;
/*
* TODO(3.0) Should we care about DER writing errors?
* All it really means is that for some reason, there's no
* AlgorithmIdentifier to be had, but the operation itself is
* still valid, just as long as it's not used to construct
* anything that needs an AlgorithmIdentifier.
*/
ctx->aid_len = 0;
if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
&& DER_w_algorithmIdentifier_SM2_with_MD(&pkt, -1, ctx->ec, md_nid)
&& WPACKET_finish(&pkt)) {
WPACKET_get_total_written(&pkt, &ctx->aid_len);
ctx->aid = WPACKET_get_curr(&pkt);
}
WPACKET_cleanup(&pkt);
if (!EVP_DigestInit_ex(ctx->mdctx, ctx->md, NULL))
goto error;
ctx->flag_compute_z_digest = 1;
ret = 1;
error:
if (!ret)
free_md(ctx);
return ret;
}
static int sm2sig_compute_z_digest(PROV_SM2_CTX *ctx)
{
uint8_t *z = NULL;
int ret = 1;
if (ctx->flag_compute_z_digest) {
/* Only do this once */
ctx
|