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3d328a44 | 1 | /* |
da1c088f | 2 | * Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved. |
3d328a44 JL |
3 | * Copyright 2017 Ribose Inc. All Rights Reserved. |
4 | * Ported from Ribose contributions from Botan. | |
5 | * | |
f9f859ad | 6 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
3d328a44 JL |
7 | * this file except in compliance with the License. You can obtain a copy |
8 | * in the file LICENSE in the source distribution or at | |
9 | * https://www.openssl.org/source/license.html | |
10 | */ | |
11 | ||
5b5eea4b SL |
12 | #include "internal/deprecated.h" |
13 | ||
25f2138b DMSP |
14 | #include "crypto/sm2.h" |
15 | #include "crypto/sm2err.h" | |
32ab57cb | 16 | #include "crypto/ec.h" /* ossl_ec_group_do_inverse_ord() */ |
88ea3685 | 17 | #include "internal/numbers.h" |
2398404e | 18 | #include <openssl/err.h> |
3d328a44 JL |
19 | #include <openssl/evp.h> |
20 | #include <openssl/bn.h> | |
21 | #include <string.h> | |
22 | ||
32ab57cb SL |
23 | int ossl_sm2_compute_z_digest(uint8_t *out, |
24 | const EVP_MD *digest, | |
25 | const uint8_t *id, | |
26 | const size_t id_len, | |
27 | const EC_KEY *key) | |
5bd0abe7 PY |
28 | { |
29 | int rc = 0; | |
30 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
31 | BN_CTX *ctx = NULL; | |
32 | EVP_MD_CTX *hash = NULL; | |
33 | BIGNUM *p = NULL; | |
34 | BIGNUM *a = NULL; | |
35 | BIGNUM *b = NULL; | |
36 | BIGNUM *xG = NULL; | |
37 | BIGNUM *yG = NULL; | |
38 | BIGNUM *xA = NULL; | |
39 | BIGNUM *yA = NULL; | |
40 | int p_bytes = 0; | |
41 | uint8_t *buf = NULL; | |
4803717f | 42 | uint16_t entl = 0; |
5bd0abe7 PY |
43 | uint8_t e_byte = 0; |
44 | ||
45 | hash = EVP_MD_CTX_new(); | |
e077455e RL |
46 | if (hash == NULL) { |
47 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); | |
48 | goto done; | |
49 | } | |
32ab57cb | 50 | ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(key)); |
e077455e RL |
51 | if (ctx == NULL) { |
52 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); | |
5bd0abe7 PY |
53 | goto done; |
54 | } | |
55 | ||
56 | p = BN_CTX_get(ctx); | |
57 | a = BN_CTX_get(ctx); | |
58 | b = BN_CTX_get(ctx); | |
59 | xG = BN_CTX_get(ctx); | |
60 | yG = BN_CTX_get(ctx); | |
61 | xA = BN_CTX_get(ctx); | |
62 | yA = BN_CTX_get(ctx); | |
63 | ||
64 | if (yA == NULL) { | |
e077455e | 65 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
5bd0abe7 PY |
66 | goto done; |
67 | } | |
68 | ||
69 | if (!EVP_DigestInit(hash, digest)) { | |
9311d0c4 | 70 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
71 | goto done; |
72 | } | |
73 | ||
4803717f | 74 | /* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */ |
5bd0abe7 | 75 | |
00433bad | 76 | if (id_len >= (UINT16_MAX / 8)) { |
5bd0abe7 | 77 | /* too large */ |
9311d0c4 | 78 | ERR_raise(ERR_LIB_SM2, SM2_R_ID_TOO_LARGE); |
5bd0abe7 PY |
79 | goto done; |
80 | } | |
81 | ||
4803717f | 82 | entl = (uint16_t)(8 * id_len); |
5bd0abe7 | 83 | |
4803717f | 84 | e_byte = entl >> 8; |
5bd0abe7 | 85 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { |
9311d0c4 | 86 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
87 | goto done; |
88 | } | |
4803717f PY |
89 | e_byte = entl & 0xFF; |
90 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { | |
9311d0c4 | 91 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
4803717f PY |
92 | goto done; |
93 | } | |
94 | ||
95 | if (id_len > 0 && !EVP_DigestUpdate(hash, id, id_len)) { | |
9311d0c4 | 96 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
97 | goto done; |
98 | } | |
99 | ||
100 | if (!EC_GROUP_get_curve(group, p, a, b, ctx)) { | |
9311d0c4 | 101 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
5bd0abe7 PY |
102 | goto done; |
103 | } | |
104 | ||
105 | p_bytes = BN_num_bytes(p); | |
106 | buf = OPENSSL_zalloc(p_bytes); | |
e077455e | 107 | if (buf == NULL) |
5bd0abe7 | 108 | goto done; |
5bd0abe7 PY |
109 | |
110 | if (BN_bn2binpad(a, buf, p_bytes) < 0 | |
111 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
112 | || BN_bn2binpad(b, buf, p_bytes) < 0 | |
113 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
114 | || !EC_POINT_get_affine_coordinates(group, | |
115 | EC_GROUP_get0_generator(group), | |
116 | xG, yG, ctx) | |
117 | || BN_bn2binpad(xG, buf, p_bytes) < 0 | |
118 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
119 | || BN_bn2binpad(yG, buf, p_bytes) < 0 | |
120 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
121 | || !EC_POINT_get_affine_coordinates(group, | |
122 | EC_KEY_get0_public_key(key), | |
123 | xA, yA, ctx) | |
124 | || BN_bn2binpad(xA, buf, p_bytes) < 0 | |
125 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
126 | || BN_bn2binpad(yA, buf, p_bytes) < 0 | |
127 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
128 | || !EVP_DigestFinal(hash, out, NULL)) { | |
9311d0c4 | 129 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5bd0abe7 PY |
130 | goto done; |
131 | } | |
132 | ||
133 | rc = 1; | |
134 | ||
135 | done: | |
136 | OPENSSL_free(buf); | |
137 | BN_CTX_free(ctx); | |
138 | EVP_MD_CTX_free(hash); | |
139 | return rc; | |
140 | } | |
141 | ||
2167239a | 142 | static BIGNUM *sm2_compute_msg_hash(const EVP_MD *digest, |
2398404e | 143 | const EC_KEY *key, |
00433bad PY |
144 | const uint8_t *id, |
145 | const size_t id_len, | |
2398404e | 146 | const uint8_t *msg, size_t msg_len) |
3d328a44 JL |
147 | { |
148 | EVP_MD_CTX *hash = EVP_MD_CTX_new(); | |
ed576acd | 149 | const int md_size = EVP_MD_get_size(digest); |
4803717f | 150 | uint8_t *z = NULL; |
3d328a44 | 151 | BIGNUM *e = NULL; |
5ccada09 | 152 | EVP_MD *fetched_digest = NULL; |
32ab57cb SL |
153 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
154 | const char *propq = ossl_ec_key_get0_propq(key); | |
3d328a44 | 155 | |
3e0076c2 | 156 | if (md_size < 0) { |
9311d0c4 | 157 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_DIGEST); |
3d328a44 | 158 | goto done; |
245be530 | 159 | } |
e077455e RL |
160 | if (hash == NULL) { |
161 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); | |
162 | goto done; | |
163 | } | |
3d328a44 | 164 | |
4803717f | 165 | z = OPENSSL_zalloc(md_size); |
e077455e | 166 | if (z == NULL) |
3d328a44 JL |
167 | goto done; |
168 | ||
ed576acd | 169 | fetched_digest = EVP_MD_fetch(libctx, EVP_MD_get0_name(digest), propq); |
5ccada09 | 170 | if (fetched_digest == NULL) { |
9311d0c4 | 171 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
172 | goto done; |
173 | } | |
174 | ||
32ab57cb | 175 | if (!ossl_sm2_compute_z_digest(z, fetched_digest, id, id_len, key)) { |
245be530 | 176 | /* SM2err already called */ |
3d328a44 | 177 | goto done; |
245be530 | 178 | } |
3d328a44 | 179 | |
5ccada09 | 180 | if (!EVP_DigestInit(hash, fetched_digest) |
4803717f | 181 | || !EVP_DigestUpdate(hash, z, md_size) |
245be530 | 182 | || !EVP_DigestUpdate(hash, msg, msg_len) |
4803717f PY |
183 | /* reuse z buffer to hold H(Z || M) */ |
184 | || !EVP_DigestFinal(hash, z, NULL)) { | |
9311d0c4 | 185 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
3d328a44 | 186 | goto done; |
245be530 | 187 | } |
3d328a44 | 188 | |
4803717f | 189 | e = BN_bin2bn(z, md_size, NULL); |
245be530 | 190 | if (e == NULL) |
9311d0c4 | 191 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 JL |
192 | |
193 | done: | |
5ccada09 | 194 | EVP_MD_free(fetched_digest); |
4803717f | 195 | OPENSSL_free(z); |
3d328a44 JL |
196 | EVP_MD_CTX_free(hash); |
197 | return e; | |
198 | } | |
199 | ||
2167239a | 200 | static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e) |
3d328a44 JL |
201 | { |
202 | const BIGNUM *dA = EC_KEY_get0_private_key(key); | |
203 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
204 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
3d328a44 JL |
205 | ECDSA_SIG *sig = NULL; |
206 | EC_POINT *kG = NULL; | |
207 | BN_CTX *ctx = NULL; | |
208 | BIGNUM *k = NULL; | |
209 | BIGNUM *rk = NULL; | |
210 | BIGNUM *r = NULL; | |
211 | BIGNUM *s = NULL; | |
212 | BIGNUM *x1 = NULL; | |
213 | BIGNUM *tmp = NULL; | |
32ab57cb | 214 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 JL |
215 | |
216 | kG = EC_POINT_new(group); | |
e077455e RL |
217 | if (kG == NULL) { |
218 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); | |
219 | goto done; | |
220 | } | |
5ccada09 | 221 | ctx = BN_CTX_new_ex(libctx); |
e077455e RL |
222 | if (ctx == NULL) { |
223 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); | |
3d328a44 | 224 | goto done; |
245be530 | 225 | } |
3d328a44 | 226 | |
245be530 | 227 | BN_CTX_start(ctx); |
3d328a44 JL |
228 | k = BN_CTX_get(ctx); |
229 | rk = BN_CTX_get(ctx); | |
230 | x1 = BN_CTX_get(ctx); | |
231 | tmp = BN_CTX_get(ctx); | |
245be530 | 232 | if (tmp == NULL) { |
e077455e | 233 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 234 | goto done; |
245be530 | 235 | } |
3d328a44 | 236 | |
245be530 MC |
237 | /* |
238 | * These values are returned and so should not be allocated out of the | |
239 | * context | |
240 | */ | |
3d328a44 JL |
241 | r = BN_new(); |
242 | s = BN_new(); | |
243 | ||
245be530 | 244 | if (r == NULL || s == NULL) { |
e077455e | 245 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 246 | goto done; |
245be530 | 247 | } |
3d328a44 | 248 | |
e81c81c9 MY |
249 | /* |
250 | * A3: Generate a random number k in [1,n-1] using random number generators; | |
251 | * A4: Compute (x1,y1)=[k]G, and convert the type of data x1 to be integer | |
252 | * as specified in clause 4.2.8 of GM/T 0003.1-2012; | |
253 | * A5: Compute r=(e+x1) mod n. If r=0 or r+k=n, then go to A3; | |
254 | * A6: Compute s=(1/(1+dA)*(k-r*dA)) mod n. If s=0, then go to A3; | |
255 | * A7: Convert the type of data (r,s) to be bit strings according to the details | |
256 | * in clause 4.2.2 of GM/T 0003.1-2012. Then the signature of message M is (r,s). | |
257 | */ | |
3d328a44 | 258 | for (;;) { |
5cbd2ea3 | 259 | if (!BN_priv_rand_range_ex(k, order, 0, ctx)) { |
9311d0c4 | 260 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
9e4c9777 | 261 | goto done; |
245be530 | 262 | } |
3d328a44 | 263 | |
245be530 | 264 | if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx) |
9cc570d4 | 265 | || !EC_POINT_get_affine_coordinates(group, kG, x1, NULL, |
5bd0abe7 | 266 | ctx) |
245be530 | 267 | || !BN_mod_add(r, e, x1, order, ctx)) { |
9311d0c4 | 268 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 | 269 | goto done; |
245be530 | 270 | } |
3d328a44 JL |
271 | |
272 | /* try again if r == 0 or r+k == n */ | |
273 | if (BN_is_zero(r)) | |
274 | continue; | |
275 | ||
245be530 | 276 | if (!BN_add(rk, r, k)) { |
9311d0c4 | 277 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
278 | goto done; |
279 | } | |
3d328a44 JL |
280 | |
281 | if (BN_cmp(rk, order) == 0) | |
282 | continue; | |
283 | ||
245be530 | 284 | if (!BN_add(s, dA, BN_value_one()) |
32ab57cb | 285 | || !ossl_ec_group_do_inverse_ord(group, s, s, ctx) |
245be530 MC |
286 | || !BN_mod_mul(tmp, dA, r, order, ctx) |
287 | || !BN_sub(tmp, k, tmp) | |
288 | || !BN_mod_mul(s, s, tmp, order, ctx)) { | |
9311d0c4 | 289 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
290 | goto done; |
291 | } | |
3d328a44 | 292 | |
e81c81c9 MY |
293 | /* try again if s == 0 */ |
294 | if (BN_is_zero(s)) | |
295 | continue; | |
296 | ||
3d328a44 | 297 | sig = ECDSA_SIG_new(); |
245be530 | 298 | if (sig == NULL) { |
e077455e | 299 | ERR_raise(ERR_LIB_SM2, ERR_R_ECDSA_LIB); |
3d328a44 | 300 | goto done; |
245be530 | 301 | } |
3d328a44 JL |
302 | |
303 | /* takes ownership of r and s */ | |
304 | ECDSA_SIG_set0(sig, r, s); | |
305 | break; | |
306 | } | |
307 | ||
308 | done: | |
3d328a44 JL |
309 | if (sig == NULL) { |
310 | BN_free(r); | |
311 | BN_free(s); | |
312 | } | |
313 | ||
314 | BN_CTX_free(ctx); | |
315 | EC_POINT_free(kG); | |
316 | return sig; | |
3d328a44 JL |
317 | } |
318 | ||
2167239a | 319 | static int sm2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig, |
245be530 | 320 | const BIGNUM *e) |
3d328a44 JL |
321 | { |
322 | int ret = 0; | |
323 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
324 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
325 | BN_CTX *ctx = NULL; | |
326 | EC_POINT *pt = NULL; | |
3d328a44 JL |
327 | BIGNUM *t = NULL; |
328 | BIGNUM *x1 = NULL; | |
329 | const BIGNUM *r = NULL; | |
330 | const BIGNUM *s = NULL; | |
32ab57cb | 331 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 | 332 | |
5ccada09 | 333 | ctx = BN_CTX_new_ex(libctx); |
3d328a44 | 334 | pt = EC_POINT_new(group); |
245be530 | 335 | if (ctx == NULL || pt == NULL) { |
e077455e | 336 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
3d328a44 | 337 | goto done; |
245be530 | 338 | } |
3d328a44 JL |
339 | |
340 | BN_CTX_start(ctx); | |
3d328a44 JL |
341 | t = BN_CTX_get(ctx); |
342 | x1 = BN_CTX_get(ctx); | |
245be530 | 343 | if (x1 == NULL) { |
e077455e | 344 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
345 | goto done; |
346 | } | |
3d328a44 JL |
347 | |
348 | /* | |
245be530 | 349 | * B1: verify whether r' in [1,n-1], verification failed if not |
c2969ff6 | 350 | * B2: verify whether s' in [1,n-1], verification failed if not |
245be530 MC |
351 | * B3: set M'~=ZA || M' |
352 | * B4: calculate e'=Hv(M'~) | |
353 | * B5: calculate t = (r' + s') modn, verification failed if t=0 | |
354 | * B6: calculate the point (x1', y1')=[s']G + [t]PA | |
c2969ff6 | 355 | * B7: calculate R=(e'+x1') modn, verification pass if yes, otherwise failed |
3d328a44 JL |
356 | */ |
357 | ||
358 | ECDSA_SIG_get0(sig, &r, &s); | |
359 | ||
245be530 MC |
360 | if (BN_cmp(r, BN_value_one()) < 0 |
361 | || BN_cmp(s, BN_value_one()) < 0 | |
362 | || BN_cmp(order, r) <= 0 | |
363 | || BN_cmp(order, s) <= 0) { | |
9311d0c4 | 364 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 365 | goto done; |
245be530 | 366 | } |
3d328a44 | 367 | |
245be530 | 368 | if (!BN_mod_add(t, r, s, order, ctx)) { |
9311d0c4 | 369 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 370 | goto done; |
245be530 | 371 | } |
3d328a44 | 372 | |
245be530 | 373 | if (BN_is_zero(t)) { |
9311d0c4 | 374 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 375 | goto done; |
245be530 | 376 | } |
3d328a44 | 377 | |
245be530 | 378 | if (!EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx) |
9cc570d4 | 379 | || !EC_POINT_get_affine_coordinates(group, pt, x1, NULL, ctx)) { |
9311d0c4 | 380 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
3d328a44 | 381 | goto done; |
245be530 | 382 | } |
3d328a44 | 383 | |
245be530 | 384 | if (!BN_mod_add(t, e, x1, order, ctx)) { |
9311d0c4 | 385 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 386 | goto done; |
245be530 | 387 | } |
3d328a44 JL |
388 | |
389 | if (BN_cmp(r, t) == 0) | |
390 | ret = 1; | |
391 | ||
392 | done: | |
050dddb0 | 393 | BN_CTX_end(ctx); |
3d328a44 JL |
394 | EC_POINT_free(pt); |
395 | BN_CTX_free(ctx); | |
396 | return ret; | |
397 | } | |
398 | ||
32ab57cb SL |
399 | ECDSA_SIG *ossl_sm2_do_sign(const EC_KEY *key, |
400 | const EVP_MD *digest, | |
401 | const uint8_t *id, | |
402 | const size_t id_len, | |
403 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
404 | { |
405 | BIGNUM *e = NULL; | |
406 | ECDSA_SIG *sig = NULL; | |
407 | ||
00433bad | 408 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
409 | if (e == NULL) { |
410 | /* SM2err already called */ | |
3d328a44 | 411 | goto done; |
245be530 | 412 | } |
3d328a44 | 413 | |
2167239a | 414 | sig = sm2_sig_gen(key, e); |
3d328a44 JL |
415 | |
416 | done: | |
417 | BN_free(e); | |
418 | return sig; | |
419 | } | |
420 | ||
32ab57cb SL |
421 | int ossl_sm2_do_verify(const EC_KEY *key, |
422 | const EVP_MD *digest, | |
423 | const ECDSA_SIG *sig, | |
424 | const uint8_t *id, | |
425 | const size_t id_len, | |
426 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
427 | { |
428 | BIGNUM *e = NULL; | |
245be530 | 429 | int ret = 0; |
3d328a44 | 430 | |
00433bad | 431 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
432 | if (e == NULL) { |
433 | /* SM2err already called */ | |
3d328a44 | 434 | goto done; |
245be530 | 435 | } |
3d328a44 | 436 | |
2167239a | 437 | ret = sm2_sig_verify(key, sig, e); |
3d328a44 JL |
438 | |
439 | done: | |
440 | BN_free(e); | |
441 | return ret; | |
442 | } | |
443 | ||
32ab57cb SL |
444 | int ossl_sm2_internal_sign(const unsigned char *dgst, int dgstlen, |
445 | unsigned char *sig, unsigned int *siglen, | |
446 | EC_KEY *eckey) | |
3d328a44 JL |
447 | { |
448 | BIGNUM *e = NULL; | |
449 | ECDSA_SIG *s = NULL; | |
245be530 | 450 | int sigleni; |
3d328a44 JL |
451 | int ret = -1; |
452 | ||
3d328a44 | 453 | e = BN_bin2bn(dgst, dgstlen, NULL); |
245be530 | 454 | if (e == NULL) { |
9311d0c4 | 455 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
456 | goto done; |
457 | } | |
3d328a44 | 458 | |
2167239a | 459 | s = sm2_sig_gen(eckey, e); |
5ccada09 | 460 | if (s == NULL) { |
9311d0c4 | 461 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
462 | goto done; |
463 | } | |
3d328a44 | 464 | |
4befe81a | 465 | sigleni = i2d_ECDSA_SIG(s, sig != NULL ? &sig : NULL); |
245be530 | 466 | if (sigleni < 0) { |
9311d0c4 | 467 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
468 | goto done; |
469 | } | |
470 | *siglen = (unsigned int)sigleni; | |
3d328a44 | 471 | |
67cc2bae | 472 | ret = 1; |
3d328a44 JL |
473 | |
474 | done: | |
475 | ECDSA_SIG_free(s); | |
476 | BN_free(e); | |
477 | return ret; | |
478 | } | |
479 | ||
32ab57cb SL |
480 | int ossl_sm2_internal_verify(const unsigned char *dgst, int dgstlen, |
481 | const unsigned char *sig, int sig_len, | |
482 | EC_KEY *eckey) | |
3d328a44 JL |
483 | { |
484 | ECDSA_SIG *s = NULL; | |
485 | BIGNUM *e = NULL; | |
486 | const unsigned char *p = sig; | |
487 | unsigned char *der = NULL; | |
488 | int derlen = -1; | |
489 | int ret = -1; | |
490 | ||
3d328a44 | 491 | s = ECDSA_SIG_new(); |
245be530 | 492 | if (s == NULL) { |
e077455e | 493 | ERR_raise(ERR_LIB_SM2, ERR_R_ECDSA_LIB); |
3d328a44 | 494 | goto done; |
245be530 MC |
495 | } |
496 | if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) { | |
9311d0c4 | 497 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 498 | goto done; |
245be530 | 499 | } |
3d328a44 JL |
500 | /* Ensure signature uses DER and doesn't have trailing garbage */ |
501 | derlen = i2d_ECDSA_SIG(s, &der); | |
245be530 | 502 | if (derlen != sig_len || memcmp(sig, der, derlen) != 0) { |
9311d0c4 | 503 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 504 | goto done; |
245be530 | 505 | } |
3d328a44 JL |
506 | |
507 | e = BN_bin2bn(dgst, dgstlen, NULL); | |
245be530 | 508 | if (e == NULL) { |
9311d0c4 | 509 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
510 | goto done; |
511 | } | |
3d328a44 | 512 | |
2167239a | 513 | ret = sm2_sig_verify(eckey, s, e); |
3d328a44 JL |
514 | |
515 | done: | |
516 | OPENSSL_free(der); | |
517 | BN_free(e); | |
518 | ECDSA_SIG_free(s); | |
519 | return ret; | |
520 | } |