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3d328a44 | 1 | /* |
4333b89f | 2 | * Copyright 2017-2021 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 | 19 | #include <openssl/evp.h> |
2398404e | 20 | #include <openssl/err.h> |
3d328a44 JL |
21 | #include <openssl/bn.h> |
22 | #include <string.h> | |
23 | ||
32ab57cb SL |
24 | int ossl_sm2_compute_z_digest(uint8_t *out, |
25 | const EVP_MD *digest, | |
26 | const uint8_t *id, | |
27 | const size_t id_len, | |
28 | const EC_KEY *key) | |
5bd0abe7 PY |
29 | { |
30 | int rc = 0; | |
31 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
32 | BN_CTX *ctx = NULL; | |
33 | EVP_MD_CTX *hash = NULL; | |
34 | BIGNUM *p = NULL; | |
35 | BIGNUM *a = NULL; | |
36 | BIGNUM *b = NULL; | |
37 | BIGNUM *xG = NULL; | |
38 | BIGNUM *yG = NULL; | |
39 | BIGNUM *xA = NULL; | |
40 | BIGNUM *yA = NULL; | |
41 | int p_bytes = 0; | |
42 | uint8_t *buf = NULL; | |
4803717f | 43 | uint16_t entl = 0; |
5bd0abe7 PY |
44 | uint8_t e_byte = 0; |
45 | ||
46 | hash = EVP_MD_CTX_new(); | |
32ab57cb | 47 | ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(key)); |
5bd0abe7 | 48 | if (hash == NULL || ctx == NULL) { |
9311d0c4 | 49 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
5bd0abe7 PY |
50 | goto done; |
51 | } | |
52 | ||
53 | p = BN_CTX_get(ctx); | |
54 | a = BN_CTX_get(ctx); | |
55 | b = BN_CTX_get(ctx); | |
56 | xG = BN_CTX_get(ctx); | |
57 | yG = BN_CTX_get(ctx); | |
58 | xA = BN_CTX_get(ctx); | |
59 | yA = BN_CTX_get(ctx); | |
60 | ||
61 | if (yA == NULL) { | |
9311d0c4 | 62 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
5bd0abe7 PY |
63 | goto done; |
64 | } | |
65 | ||
66 | if (!EVP_DigestInit(hash, digest)) { | |
9311d0c4 | 67 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
68 | goto done; |
69 | } | |
70 | ||
4803717f | 71 | /* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */ |
5bd0abe7 | 72 | |
00433bad | 73 | if (id_len >= (UINT16_MAX / 8)) { |
5bd0abe7 | 74 | /* too large */ |
9311d0c4 | 75 | ERR_raise(ERR_LIB_SM2, SM2_R_ID_TOO_LARGE); |
5bd0abe7 PY |
76 | goto done; |
77 | } | |
78 | ||
4803717f | 79 | entl = (uint16_t)(8 * id_len); |
5bd0abe7 | 80 | |
4803717f | 81 | e_byte = entl >> 8; |
5bd0abe7 | 82 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { |
9311d0c4 | 83 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
84 | goto done; |
85 | } | |
4803717f PY |
86 | e_byte = entl & 0xFF; |
87 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { | |
9311d0c4 | 88 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
4803717f PY |
89 | goto done; |
90 | } | |
91 | ||
92 | if (id_len > 0 && !EVP_DigestUpdate(hash, id, id_len)) { | |
9311d0c4 | 93 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
94 | goto done; |
95 | } | |
96 | ||
97 | if (!EC_GROUP_get_curve(group, p, a, b, ctx)) { | |
9311d0c4 | 98 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
5bd0abe7 PY |
99 | goto done; |
100 | } | |
101 | ||
102 | p_bytes = BN_num_bytes(p); | |
103 | buf = OPENSSL_zalloc(p_bytes); | |
104 | if (buf == NULL) { | |
9311d0c4 | 105 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
5bd0abe7 PY |
106 | goto done; |
107 | } | |
108 | ||
109 | if (BN_bn2binpad(a, buf, p_bytes) < 0 | |
110 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
111 | || BN_bn2binpad(b, buf, p_bytes) < 0 | |
112 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
113 | || !EC_POINT_get_affine_coordinates(group, | |
114 | EC_GROUP_get0_generator(group), | |
115 | xG, yG, ctx) | |
116 | || BN_bn2binpad(xG, buf, p_bytes) < 0 | |
117 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
118 | || BN_bn2binpad(yG, buf, p_bytes) < 0 | |
119 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
120 | || !EC_POINT_get_affine_coordinates(group, | |
121 | EC_KEY_get0_public_key(key), | |
122 | xA, yA, ctx) | |
123 | || BN_bn2binpad(xA, buf, p_bytes) < 0 | |
124 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
125 | || BN_bn2binpad(yA, buf, p_bytes) < 0 | |
126 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
127 | || !EVP_DigestFinal(hash, out, NULL)) { | |
9311d0c4 | 128 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5bd0abe7 PY |
129 | goto done; |
130 | } | |
131 | ||
132 | rc = 1; | |
133 | ||
134 | done: | |
135 | OPENSSL_free(buf); | |
136 | BN_CTX_free(ctx); | |
137 | EVP_MD_CTX_free(hash); | |
138 | return rc; | |
139 | } | |
140 | ||
2167239a | 141 | static BIGNUM *sm2_compute_msg_hash(const EVP_MD *digest, |
2398404e | 142 | const EC_KEY *key, |
00433bad PY |
143 | const uint8_t *id, |
144 | const size_t id_len, | |
2398404e | 145 | const uint8_t *msg, size_t msg_len) |
3d328a44 JL |
146 | { |
147 | EVP_MD_CTX *hash = EVP_MD_CTX_new(); | |
148 | const int md_size = EVP_MD_size(digest); | |
4803717f | 149 | uint8_t *z = NULL; |
3d328a44 | 150 | BIGNUM *e = NULL; |
5ccada09 | 151 | EVP_MD *fetched_digest = NULL; |
32ab57cb SL |
152 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
153 | const char *propq = ossl_ec_key_get0_propq(key); | |
3d328a44 | 154 | |
3e0076c2 | 155 | if (md_size < 0) { |
9311d0c4 | 156 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_DIGEST); |
3d328a44 | 157 | goto done; |
245be530 | 158 | } |
3d328a44 | 159 | |
4803717f PY |
160 | z = OPENSSL_zalloc(md_size); |
161 | if (hash == NULL || z == NULL) { | |
9311d0c4 | 162 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 163 | goto done; |
245be530 | 164 | } |
3d328a44 | 165 | |
5ccada09 SL |
166 | fetched_digest = EVP_MD_fetch(libctx, EVP_MD_name(digest), propq); |
167 | if (fetched_digest == NULL) { | |
9311d0c4 | 168 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
169 | goto done; |
170 | } | |
171 | ||
32ab57cb | 172 | if (!ossl_sm2_compute_z_digest(z, fetched_digest, id, id_len, key)) { |
245be530 | 173 | /* SM2err already called */ |
3d328a44 | 174 | goto done; |
245be530 | 175 | } |
3d328a44 | 176 | |
5ccada09 | 177 | if (!EVP_DigestInit(hash, fetched_digest) |
4803717f | 178 | || !EVP_DigestUpdate(hash, z, md_size) |
245be530 | 179 | || !EVP_DigestUpdate(hash, msg, msg_len) |
4803717f PY |
180 | /* reuse z buffer to hold H(Z || M) */ |
181 | || !EVP_DigestFinal(hash, z, NULL)) { | |
9311d0c4 | 182 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
3d328a44 | 183 | goto done; |
245be530 | 184 | } |
3d328a44 | 185 | |
4803717f | 186 | e = BN_bin2bn(z, md_size, NULL); |
245be530 | 187 | if (e == NULL) |
9311d0c4 | 188 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 JL |
189 | |
190 | done: | |
5ccada09 | 191 | EVP_MD_free(fetched_digest); |
4803717f | 192 | OPENSSL_free(z); |
3d328a44 JL |
193 | EVP_MD_CTX_free(hash); |
194 | return e; | |
195 | } | |
196 | ||
2167239a | 197 | static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e) |
3d328a44 JL |
198 | { |
199 | const BIGNUM *dA = EC_KEY_get0_private_key(key); | |
200 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
201 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
3d328a44 JL |
202 | ECDSA_SIG *sig = NULL; |
203 | EC_POINT *kG = NULL; | |
204 | BN_CTX *ctx = NULL; | |
205 | BIGNUM *k = NULL; | |
206 | BIGNUM *rk = NULL; | |
207 | BIGNUM *r = NULL; | |
208 | BIGNUM *s = NULL; | |
209 | BIGNUM *x1 = NULL; | |
210 | BIGNUM *tmp = NULL; | |
32ab57cb | 211 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 JL |
212 | |
213 | kG = EC_POINT_new(group); | |
5ccada09 | 214 | ctx = BN_CTX_new_ex(libctx); |
245be530 | 215 | if (kG == NULL || ctx == NULL) { |
9311d0c4 | 216 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 217 | goto done; |
245be530 | 218 | } |
3d328a44 | 219 | |
245be530 | 220 | BN_CTX_start(ctx); |
3d328a44 JL |
221 | k = BN_CTX_get(ctx); |
222 | rk = BN_CTX_get(ctx); | |
223 | x1 = BN_CTX_get(ctx); | |
224 | tmp = BN_CTX_get(ctx); | |
245be530 | 225 | if (tmp == NULL) { |
9311d0c4 | 226 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 227 | goto done; |
245be530 | 228 | } |
3d328a44 | 229 | |
245be530 MC |
230 | /* |
231 | * These values are returned and so should not be allocated out of the | |
232 | * context | |
233 | */ | |
3d328a44 JL |
234 | r = BN_new(); |
235 | s = BN_new(); | |
236 | ||
245be530 | 237 | if (r == NULL || s == NULL) { |
9311d0c4 | 238 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 239 | goto done; |
245be530 | 240 | } |
3d328a44 JL |
241 | |
242 | for (;;) { | |
5cbd2ea3 | 243 | if (!BN_priv_rand_range_ex(k, order, 0, ctx)) { |
9311d0c4 | 244 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
9e4c9777 | 245 | goto done; |
245be530 | 246 | } |
3d328a44 | 247 | |
245be530 | 248 | if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx) |
9cc570d4 | 249 | || !EC_POINT_get_affine_coordinates(group, kG, x1, NULL, |
5bd0abe7 | 250 | ctx) |
245be530 | 251 | || !BN_mod_add(r, e, x1, order, ctx)) { |
9311d0c4 | 252 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 | 253 | goto done; |
245be530 | 254 | } |
3d328a44 JL |
255 | |
256 | /* try again if r == 0 or r+k == n */ | |
257 | if (BN_is_zero(r)) | |
258 | continue; | |
259 | ||
245be530 | 260 | if (!BN_add(rk, r, k)) { |
9311d0c4 | 261 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
262 | goto done; |
263 | } | |
3d328a44 JL |
264 | |
265 | if (BN_cmp(rk, order) == 0) | |
266 | continue; | |
267 | ||
245be530 | 268 | if (!BN_add(s, dA, BN_value_one()) |
32ab57cb | 269 | || !ossl_ec_group_do_inverse_ord(group, s, s, ctx) |
245be530 MC |
270 | || !BN_mod_mul(tmp, dA, r, order, ctx) |
271 | || !BN_sub(tmp, k, tmp) | |
272 | || !BN_mod_mul(s, s, tmp, order, ctx)) { | |
9311d0c4 | 273 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
274 | goto done; |
275 | } | |
3d328a44 JL |
276 | |
277 | sig = ECDSA_SIG_new(); | |
245be530 | 278 | if (sig == NULL) { |
9311d0c4 | 279 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 280 | goto done; |
245be530 | 281 | } |
3d328a44 JL |
282 | |
283 | /* takes ownership of r and s */ | |
284 | ECDSA_SIG_set0(sig, r, s); | |
285 | break; | |
286 | } | |
287 | ||
288 | done: | |
3d328a44 JL |
289 | if (sig == NULL) { |
290 | BN_free(r); | |
291 | BN_free(s); | |
292 | } | |
293 | ||
294 | BN_CTX_free(ctx); | |
295 | EC_POINT_free(kG); | |
296 | return sig; | |
3d328a44 JL |
297 | } |
298 | ||
2167239a | 299 | static int sm2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig, |
245be530 | 300 | const BIGNUM *e) |
3d328a44 JL |
301 | { |
302 | int ret = 0; | |
303 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
304 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
305 | BN_CTX *ctx = NULL; | |
306 | EC_POINT *pt = NULL; | |
3d328a44 JL |
307 | BIGNUM *t = NULL; |
308 | BIGNUM *x1 = NULL; | |
309 | const BIGNUM *r = NULL; | |
310 | const BIGNUM *s = NULL; | |
32ab57cb | 311 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 | 312 | |
5ccada09 | 313 | ctx = BN_CTX_new_ex(libctx); |
3d328a44 | 314 | pt = EC_POINT_new(group); |
245be530 | 315 | if (ctx == NULL || pt == NULL) { |
9311d0c4 | 316 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 317 | goto done; |
245be530 | 318 | } |
3d328a44 JL |
319 | |
320 | BN_CTX_start(ctx); | |
3d328a44 JL |
321 | t = BN_CTX_get(ctx); |
322 | x1 = BN_CTX_get(ctx); | |
245be530 | 323 | if (x1 == NULL) { |
9311d0c4 | 324 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
245be530 MC |
325 | goto done; |
326 | } | |
3d328a44 JL |
327 | |
328 | /* | |
245be530 | 329 | * B1: verify whether r' in [1,n-1], verification failed if not |
c2969ff6 | 330 | * B2: verify whether s' in [1,n-1], verification failed if not |
245be530 MC |
331 | * B3: set M'~=ZA || M' |
332 | * B4: calculate e'=Hv(M'~) | |
333 | * B5: calculate t = (r' + s') modn, verification failed if t=0 | |
334 | * B6: calculate the point (x1', y1')=[s']G + [t]PA | |
c2969ff6 | 335 | * B7: calculate R=(e'+x1') modn, verification pass if yes, otherwise failed |
3d328a44 JL |
336 | */ |
337 | ||
338 | ECDSA_SIG_get0(sig, &r, &s); | |
339 | ||
245be530 MC |
340 | if (BN_cmp(r, BN_value_one()) < 0 |
341 | || BN_cmp(s, BN_value_one()) < 0 | |
342 | || BN_cmp(order, r) <= 0 | |
343 | || BN_cmp(order, s) <= 0) { | |
9311d0c4 | 344 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 345 | goto done; |
245be530 | 346 | } |
3d328a44 | 347 | |
245be530 | 348 | if (!BN_mod_add(t, r, s, order, ctx)) { |
9311d0c4 | 349 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 350 | goto done; |
245be530 | 351 | } |
3d328a44 | 352 | |
245be530 | 353 | if (BN_is_zero(t)) { |
9311d0c4 | 354 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 355 | goto done; |
245be530 | 356 | } |
3d328a44 | 357 | |
245be530 | 358 | if (!EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx) |
9cc570d4 | 359 | || !EC_POINT_get_affine_coordinates(group, pt, x1, NULL, ctx)) { |
9311d0c4 | 360 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
3d328a44 | 361 | goto done; |
245be530 | 362 | } |
3d328a44 | 363 | |
245be530 | 364 | if (!BN_mod_add(t, e, x1, order, ctx)) { |
9311d0c4 | 365 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 366 | goto done; |
245be530 | 367 | } |
3d328a44 JL |
368 | |
369 | if (BN_cmp(r, t) == 0) | |
370 | ret = 1; | |
371 | ||
372 | done: | |
373 | EC_POINT_free(pt); | |
374 | BN_CTX_free(ctx); | |
375 | return ret; | |
376 | } | |
377 | ||
32ab57cb SL |
378 | ECDSA_SIG *ossl_sm2_do_sign(const EC_KEY *key, |
379 | const EVP_MD *digest, | |
380 | const uint8_t *id, | |
381 | const size_t id_len, | |
382 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
383 | { |
384 | BIGNUM *e = NULL; | |
385 | ECDSA_SIG *sig = NULL; | |
386 | ||
00433bad | 387 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
388 | if (e == NULL) { |
389 | /* SM2err already called */ | |
3d328a44 | 390 | goto done; |
245be530 | 391 | } |
3d328a44 | 392 | |
2167239a | 393 | sig = sm2_sig_gen(key, e); |
3d328a44 JL |
394 | |
395 | done: | |
396 | BN_free(e); | |
397 | return sig; | |
398 | } | |
399 | ||
32ab57cb SL |
400 | int ossl_sm2_do_verify(const EC_KEY *key, |
401 | const EVP_MD *digest, | |
402 | const ECDSA_SIG *sig, | |
403 | const uint8_t *id, | |
404 | const size_t id_len, | |
405 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
406 | { |
407 | BIGNUM *e = NULL; | |
245be530 | 408 | int ret = 0; |
3d328a44 | 409 | |
00433bad | 410 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
411 | if (e == NULL) { |
412 | /* SM2err already called */ | |
3d328a44 | 413 | goto done; |
245be530 | 414 | } |
3d328a44 | 415 | |
2167239a | 416 | ret = sm2_sig_verify(key, sig, e); |
3d328a44 JL |
417 | |
418 | done: | |
419 | BN_free(e); | |
420 | return ret; | |
421 | } | |
422 | ||
32ab57cb SL |
423 | int ossl_sm2_internal_sign(const unsigned char *dgst, int dgstlen, |
424 | unsigned char *sig, unsigned int *siglen, | |
425 | EC_KEY *eckey) | |
3d328a44 JL |
426 | { |
427 | BIGNUM *e = NULL; | |
428 | ECDSA_SIG *s = NULL; | |
245be530 | 429 | int sigleni; |
3d328a44 JL |
430 | int ret = -1; |
431 | ||
3d328a44 | 432 | e = BN_bin2bn(dgst, dgstlen, NULL); |
245be530 | 433 | if (e == NULL) { |
9311d0c4 | 434 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
435 | goto done; |
436 | } | |
3d328a44 | 437 | |
2167239a | 438 | s = sm2_sig_gen(eckey, e); |
5ccada09 | 439 | if (s == NULL) { |
9311d0c4 | 440 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
441 | goto done; |
442 | } | |
3d328a44 | 443 | |
245be530 MC |
444 | sigleni = i2d_ECDSA_SIG(s, &sig); |
445 | if (sigleni < 0) { | |
9311d0c4 | 446 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
447 | goto done; |
448 | } | |
449 | *siglen = (unsigned int)sigleni; | |
3d328a44 | 450 | |
67cc2bae | 451 | ret = 1; |
3d328a44 JL |
452 | |
453 | done: | |
454 | ECDSA_SIG_free(s); | |
455 | BN_free(e); | |
456 | return ret; | |
457 | } | |
458 | ||
32ab57cb SL |
459 | int ossl_sm2_internal_verify(const unsigned char *dgst, int dgstlen, |
460 | const unsigned char *sig, int sig_len, | |
461 | EC_KEY *eckey) | |
3d328a44 JL |
462 | { |
463 | ECDSA_SIG *s = NULL; | |
464 | BIGNUM *e = NULL; | |
465 | const unsigned char *p = sig; | |
466 | unsigned char *der = NULL; | |
467 | int derlen = -1; | |
468 | int ret = -1; | |
469 | ||
3d328a44 | 470 | s = ECDSA_SIG_new(); |
245be530 | 471 | if (s == NULL) { |
9311d0c4 | 472 | ERR_raise(ERR_LIB_SM2, ERR_R_MALLOC_FAILURE); |
3d328a44 | 473 | goto done; |
245be530 MC |
474 | } |
475 | if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) { | |
9311d0c4 | 476 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 477 | goto done; |
245be530 | 478 | } |
3d328a44 JL |
479 | /* Ensure signature uses DER and doesn't have trailing garbage */ |
480 | derlen = i2d_ECDSA_SIG(s, &der); | |
245be530 | 481 | if (derlen != sig_len || memcmp(sig, der, derlen) != 0) { |
9311d0c4 | 482 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 483 | goto done; |
245be530 | 484 | } |
3d328a44 JL |
485 | |
486 | e = BN_bin2bn(dgst, dgstlen, NULL); | |
245be530 | 487 | if (e == NULL) { |
9311d0c4 | 488 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
489 | goto done; |
490 | } | |
3d328a44 | 491 | |
2167239a | 492 | ret = sm2_sig_verify(eckey, s, e); |
3d328a44 JL |
493 | |
494 | done: | |
495 | OPENSSL_free(der); | |
496 | BN_free(e); | |
497 | ECDSA_SIG_free(s); | |
498 | return ret; | |
499 | } |