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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); | |
d6a8adec | 31 | const EC_POINT *pubkey = EC_KEY_get0_public_key(key); |
5bd0abe7 PY |
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 | ||
d6a8adec NH |
46 | /* SM2 Signatures require a public key, check for it */ |
47 | if (pubkey == NULL) { | |
48 | ERR_raise(ERR_LIB_SM2, ERR_R_PASSED_NULL_PARAMETER); | |
49 | goto done; | |
50 | } | |
51 | ||
5bd0abe7 | 52 | hash = EVP_MD_CTX_new(); |
e077455e RL |
53 | if (hash == NULL) { |
54 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); | |
55 | goto done; | |
56 | } | |
32ab57cb | 57 | ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(key)); |
e077455e RL |
58 | if (ctx == NULL) { |
59 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); | |
5bd0abe7 PY |
60 | goto done; |
61 | } | |
62 | ||
63 | p = BN_CTX_get(ctx); | |
64 | a = BN_CTX_get(ctx); | |
65 | b = BN_CTX_get(ctx); | |
66 | xG = BN_CTX_get(ctx); | |
67 | yG = BN_CTX_get(ctx); | |
68 | xA = BN_CTX_get(ctx); | |
69 | yA = BN_CTX_get(ctx); | |
70 | ||
71 | if (yA == NULL) { | |
e077455e | 72 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
5bd0abe7 PY |
73 | goto done; |
74 | } | |
75 | ||
76 | if (!EVP_DigestInit(hash, digest)) { | |
9311d0c4 | 77 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
78 | goto done; |
79 | } | |
80 | ||
4803717f | 81 | /* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */ |
5bd0abe7 | 82 | |
00433bad | 83 | if (id_len >= (UINT16_MAX / 8)) { |
5bd0abe7 | 84 | /* too large */ |
9311d0c4 | 85 | ERR_raise(ERR_LIB_SM2, SM2_R_ID_TOO_LARGE); |
5bd0abe7 PY |
86 | goto done; |
87 | } | |
88 | ||
4803717f | 89 | entl = (uint16_t)(8 * id_len); |
5bd0abe7 | 90 | |
4803717f | 91 | e_byte = entl >> 8; |
5bd0abe7 | 92 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { |
9311d0c4 | 93 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
94 | goto done; |
95 | } | |
4803717f PY |
96 | e_byte = entl & 0xFF; |
97 | if (!EVP_DigestUpdate(hash, &e_byte, 1)) { | |
9311d0c4 | 98 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
4803717f PY |
99 | goto done; |
100 | } | |
101 | ||
102 | if (id_len > 0 && !EVP_DigestUpdate(hash, id, id_len)) { | |
9311d0c4 | 103 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
5bd0abe7 PY |
104 | goto done; |
105 | } | |
106 | ||
107 | if (!EC_GROUP_get_curve(group, p, a, b, ctx)) { | |
9311d0c4 | 108 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
5bd0abe7 PY |
109 | goto done; |
110 | } | |
111 | ||
112 | p_bytes = BN_num_bytes(p); | |
113 | buf = OPENSSL_zalloc(p_bytes); | |
e077455e | 114 | if (buf == NULL) |
5bd0abe7 | 115 | goto done; |
5bd0abe7 PY |
116 | |
117 | if (BN_bn2binpad(a, buf, p_bytes) < 0 | |
118 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
119 | || BN_bn2binpad(b, buf, p_bytes) < 0 | |
120 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
121 | || !EC_POINT_get_affine_coordinates(group, | |
122 | EC_GROUP_get0_generator(group), | |
123 | xG, yG, ctx) | |
124 | || BN_bn2binpad(xG, buf, p_bytes) < 0 | |
125 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
126 | || BN_bn2binpad(yG, buf, p_bytes) < 0 | |
127 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
128 | || !EC_POINT_get_affine_coordinates(group, | |
d6a8adec | 129 | pubkey, |
5bd0abe7 PY |
130 | xA, yA, ctx) |
131 | || BN_bn2binpad(xA, buf, p_bytes) < 0 | |
132 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
133 | || BN_bn2binpad(yA, buf, p_bytes) < 0 | |
134 | || !EVP_DigestUpdate(hash, buf, p_bytes) | |
135 | || !EVP_DigestFinal(hash, out, NULL)) { | |
9311d0c4 | 136 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5bd0abe7 PY |
137 | goto done; |
138 | } | |
139 | ||
140 | rc = 1; | |
141 | ||
142 | done: | |
143 | OPENSSL_free(buf); | |
144 | BN_CTX_free(ctx); | |
145 | EVP_MD_CTX_free(hash); | |
146 | return rc; | |
147 | } | |
148 | ||
2167239a | 149 | static BIGNUM *sm2_compute_msg_hash(const EVP_MD *digest, |
2398404e | 150 | const EC_KEY *key, |
00433bad PY |
151 | const uint8_t *id, |
152 | const size_t id_len, | |
2398404e | 153 | const uint8_t *msg, size_t msg_len) |
3d328a44 JL |
154 | { |
155 | EVP_MD_CTX *hash = EVP_MD_CTX_new(); | |
ed576acd | 156 | const int md_size = EVP_MD_get_size(digest); |
4803717f | 157 | uint8_t *z = NULL; |
3d328a44 | 158 | BIGNUM *e = NULL; |
5ccada09 | 159 | EVP_MD *fetched_digest = NULL; |
32ab57cb SL |
160 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
161 | const char *propq = ossl_ec_key_get0_propq(key); | |
3d328a44 | 162 | |
3e0076c2 | 163 | if (md_size < 0) { |
9311d0c4 | 164 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_DIGEST); |
3d328a44 | 165 | goto done; |
245be530 | 166 | } |
e077455e RL |
167 | if (hash == NULL) { |
168 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); | |
169 | goto done; | |
170 | } | |
3d328a44 | 171 | |
4803717f | 172 | z = OPENSSL_zalloc(md_size); |
e077455e | 173 | if (z == NULL) |
3d328a44 JL |
174 | goto done; |
175 | ||
ed576acd | 176 | fetched_digest = EVP_MD_fetch(libctx, EVP_MD_get0_name(digest), propq); |
5ccada09 | 177 | if (fetched_digest == NULL) { |
9311d0c4 | 178 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
179 | goto done; |
180 | } | |
181 | ||
32ab57cb | 182 | if (!ossl_sm2_compute_z_digest(z, fetched_digest, id, id_len, key)) { |
245be530 | 183 | /* SM2err already called */ |
3d328a44 | 184 | goto done; |
245be530 | 185 | } |
3d328a44 | 186 | |
5ccada09 | 187 | if (!EVP_DigestInit(hash, fetched_digest) |
4803717f | 188 | || !EVP_DigestUpdate(hash, z, md_size) |
245be530 | 189 | || !EVP_DigestUpdate(hash, msg, msg_len) |
4803717f PY |
190 | /* reuse z buffer to hold H(Z || M) */ |
191 | || !EVP_DigestFinal(hash, z, NULL)) { | |
9311d0c4 | 192 | ERR_raise(ERR_LIB_SM2, ERR_R_EVP_LIB); |
3d328a44 | 193 | goto done; |
245be530 | 194 | } |
3d328a44 | 195 | |
4803717f | 196 | e = BN_bin2bn(z, md_size, NULL); |
245be530 | 197 | if (e == NULL) |
9311d0c4 | 198 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 JL |
199 | |
200 | done: | |
5ccada09 | 201 | EVP_MD_free(fetched_digest); |
4803717f | 202 | OPENSSL_free(z); |
3d328a44 JL |
203 | EVP_MD_CTX_free(hash); |
204 | return e; | |
205 | } | |
206 | ||
2167239a | 207 | static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e) |
3d328a44 JL |
208 | { |
209 | const BIGNUM *dA = EC_KEY_get0_private_key(key); | |
210 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
211 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
3d328a44 JL |
212 | ECDSA_SIG *sig = NULL; |
213 | EC_POINT *kG = NULL; | |
214 | BN_CTX *ctx = NULL; | |
215 | BIGNUM *k = NULL; | |
216 | BIGNUM *rk = NULL; | |
217 | BIGNUM *r = NULL; | |
218 | BIGNUM *s = NULL; | |
219 | BIGNUM *x1 = NULL; | |
220 | BIGNUM *tmp = NULL; | |
32ab57cb | 221 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 JL |
222 | |
223 | kG = EC_POINT_new(group); | |
e077455e RL |
224 | if (kG == NULL) { |
225 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); | |
226 | goto done; | |
227 | } | |
5ccada09 | 228 | ctx = BN_CTX_new_ex(libctx); |
e077455e RL |
229 | if (ctx == NULL) { |
230 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); | |
3d328a44 | 231 | goto done; |
245be530 | 232 | } |
3d328a44 | 233 | |
245be530 | 234 | BN_CTX_start(ctx); |
3d328a44 JL |
235 | k = BN_CTX_get(ctx); |
236 | rk = BN_CTX_get(ctx); | |
237 | x1 = BN_CTX_get(ctx); | |
238 | tmp = BN_CTX_get(ctx); | |
245be530 | 239 | if (tmp == NULL) { |
e077455e | 240 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 241 | goto done; |
245be530 | 242 | } |
3d328a44 | 243 | |
245be530 MC |
244 | /* |
245 | * These values are returned and so should not be allocated out of the | |
246 | * context | |
247 | */ | |
3d328a44 JL |
248 | r = BN_new(); |
249 | s = BN_new(); | |
250 | ||
245be530 | 251 | if (r == NULL || s == NULL) { |
e077455e | 252 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 253 | goto done; |
245be530 | 254 | } |
3d328a44 | 255 | |
e81c81c9 MY |
256 | /* |
257 | * A3: Generate a random number k in [1,n-1] using random number generators; | |
258 | * A4: Compute (x1,y1)=[k]G, and convert the type of data x1 to be integer | |
259 | * as specified in clause 4.2.8 of GM/T 0003.1-2012; | |
260 | * A5: Compute r=(e+x1) mod n. If r=0 or r+k=n, then go to A3; | |
261 | * A6: Compute s=(1/(1+dA)*(k-r*dA)) mod n. If s=0, then go to A3; | |
262 | * A7: Convert the type of data (r,s) to be bit strings according to the details | |
263 | * in clause 4.2.2 of GM/T 0003.1-2012. Then the signature of message M is (r,s). | |
264 | */ | |
3d328a44 | 265 | for (;;) { |
5cbd2ea3 | 266 | if (!BN_priv_rand_range_ex(k, order, 0, ctx)) { |
9311d0c4 | 267 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
9e4c9777 | 268 | goto done; |
245be530 | 269 | } |
3d328a44 | 270 | |
245be530 | 271 | if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx) |
9cc570d4 | 272 | || !EC_POINT_get_affine_coordinates(group, kG, x1, NULL, |
5bd0abe7 | 273 | ctx) |
245be530 | 274 | || !BN_mod_add(r, e, x1, order, ctx)) { |
9311d0c4 | 275 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
3d328a44 | 276 | goto done; |
245be530 | 277 | } |
3d328a44 JL |
278 | |
279 | /* try again if r == 0 or r+k == n */ | |
280 | if (BN_is_zero(r)) | |
281 | continue; | |
282 | ||
245be530 | 283 | if (!BN_add(rk, r, k)) { |
9311d0c4 | 284 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
285 | goto done; |
286 | } | |
3d328a44 JL |
287 | |
288 | if (BN_cmp(rk, order) == 0) | |
289 | continue; | |
290 | ||
245be530 | 291 | if (!BN_add(s, dA, BN_value_one()) |
32ab57cb | 292 | || !ossl_ec_group_do_inverse_ord(group, s, s, ctx) |
245be530 MC |
293 | || !BN_mod_mul(tmp, dA, r, order, ctx) |
294 | || !BN_sub(tmp, k, tmp) | |
295 | || !BN_mod_mul(s, s, tmp, order, ctx)) { | |
9311d0c4 | 296 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
297 | goto done; |
298 | } | |
3d328a44 | 299 | |
e81c81c9 MY |
300 | /* try again if s == 0 */ |
301 | if (BN_is_zero(s)) | |
302 | continue; | |
303 | ||
3d328a44 | 304 | sig = ECDSA_SIG_new(); |
245be530 | 305 | if (sig == NULL) { |
e077455e | 306 | ERR_raise(ERR_LIB_SM2, ERR_R_ECDSA_LIB); |
3d328a44 | 307 | goto done; |
245be530 | 308 | } |
3d328a44 JL |
309 | |
310 | /* takes ownership of r and s */ | |
311 | ECDSA_SIG_set0(sig, r, s); | |
312 | break; | |
313 | } | |
314 | ||
315 | done: | |
3d328a44 JL |
316 | if (sig == NULL) { |
317 | BN_free(r); | |
318 | BN_free(s); | |
319 | } | |
320 | ||
321 | BN_CTX_free(ctx); | |
322 | EC_POINT_free(kG); | |
323 | return sig; | |
3d328a44 JL |
324 | } |
325 | ||
2167239a | 326 | static int sm2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig, |
245be530 | 327 | const BIGNUM *e) |
3d328a44 JL |
328 | { |
329 | int ret = 0; | |
330 | const EC_GROUP *group = EC_KEY_get0_group(key); | |
331 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
332 | BN_CTX *ctx = NULL; | |
333 | EC_POINT *pt = NULL; | |
3d328a44 JL |
334 | BIGNUM *t = NULL; |
335 | BIGNUM *x1 = NULL; | |
336 | const BIGNUM *r = NULL; | |
337 | const BIGNUM *s = NULL; | |
32ab57cb | 338 | OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key); |
3d328a44 | 339 | |
5ccada09 | 340 | ctx = BN_CTX_new_ex(libctx); |
3d328a44 | 341 | pt = EC_POINT_new(group); |
245be530 | 342 | if (ctx == NULL || pt == NULL) { |
e077455e | 343 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
3d328a44 | 344 | goto done; |
245be530 | 345 | } |
3d328a44 JL |
346 | |
347 | BN_CTX_start(ctx); | |
3d328a44 JL |
348 | t = BN_CTX_get(ctx); |
349 | x1 = BN_CTX_get(ctx); | |
245be530 | 350 | if (x1 == NULL) { |
e077455e | 351 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
352 | goto done; |
353 | } | |
3d328a44 JL |
354 | |
355 | /* | |
245be530 | 356 | * B1: verify whether r' in [1,n-1], verification failed if not |
c2969ff6 | 357 | * B2: verify whether s' in [1,n-1], verification failed if not |
245be530 MC |
358 | * B3: set M'~=ZA || M' |
359 | * B4: calculate e'=Hv(M'~) | |
360 | * B5: calculate t = (r' + s') modn, verification failed if t=0 | |
361 | * B6: calculate the point (x1', y1')=[s']G + [t]PA | |
c2969ff6 | 362 | * B7: calculate R=(e'+x1') modn, verification pass if yes, otherwise failed |
3d328a44 JL |
363 | */ |
364 | ||
365 | ECDSA_SIG_get0(sig, &r, &s); | |
366 | ||
245be530 MC |
367 | if (BN_cmp(r, BN_value_one()) < 0 |
368 | || BN_cmp(s, BN_value_one()) < 0 | |
369 | || BN_cmp(order, r) <= 0 | |
370 | || BN_cmp(order, s) <= 0) { | |
9311d0c4 | 371 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 372 | goto done; |
245be530 | 373 | } |
3d328a44 | 374 | |
245be530 | 375 | if (!BN_mod_add(t, r, s, order, ctx)) { |
9311d0c4 | 376 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 377 | goto done; |
245be530 | 378 | } |
3d328a44 | 379 | |
245be530 | 380 | if (BN_is_zero(t)) { |
9311d0c4 | 381 | ERR_raise(ERR_LIB_SM2, SM2_R_BAD_SIGNATURE); |
3d328a44 | 382 | goto done; |
245be530 | 383 | } |
3d328a44 | 384 | |
245be530 | 385 | if (!EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx) |
9cc570d4 | 386 | || !EC_POINT_get_affine_coordinates(group, pt, x1, NULL, ctx)) { |
9311d0c4 | 387 | ERR_raise(ERR_LIB_SM2, ERR_R_EC_LIB); |
3d328a44 | 388 | goto done; |
245be530 | 389 | } |
3d328a44 | 390 | |
245be530 | 391 | if (!BN_mod_add(t, e, x1, order, ctx)) { |
9311d0c4 | 392 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
3d328a44 | 393 | goto done; |
245be530 | 394 | } |
3d328a44 JL |
395 | |
396 | if (BN_cmp(r, t) == 0) | |
397 | ret = 1; | |
398 | ||
399 | done: | |
050dddb0 | 400 | BN_CTX_end(ctx); |
3d328a44 JL |
401 | EC_POINT_free(pt); |
402 | BN_CTX_free(ctx); | |
403 | return ret; | |
404 | } | |
405 | ||
32ab57cb SL |
406 | ECDSA_SIG *ossl_sm2_do_sign(const EC_KEY *key, |
407 | const EVP_MD *digest, | |
408 | const uint8_t *id, | |
409 | const size_t id_len, | |
410 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
411 | { |
412 | BIGNUM *e = NULL; | |
413 | ECDSA_SIG *sig = NULL; | |
414 | ||
00433bad | 415 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
416 | if (e == NULL) { |
417 | /* SM2err already called */ | |
3d328a44 | 418 | goto done; |
245be530 | 419 | } |
3d328a44 | 420 | |
2167239a | 421 | sig = sm2_sig_gen(key, e); |
3d328a44 JL |
422 | |
423 | done: | |
424 | BN_free(e); | |
425 | return sig; | |
426 | } | |
427 | ||
32ab57cb SL |
428 | int ossl_sm2_do_verify(const EC_KEY *key, |
429 | const EVP_MD *digest, | |
430 | const ECDSA_SIG *sig, | |
431 | const uint8_t *id, | |
432 | const size_t id_len, | |
433 | const uint8_t *msg, size_t msg_len) | |
3d328a44 JL |
434 | { |
435 | BIGNUM *e = NULL; | |
245be530 | 436 | int ret = 0; |
3d328a44 | 437 | |
00433bad | 438 | e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len); |
245be530 MC |
439 | if (e == NULL) { |
440 | /* SM2err already called */ | |
3d328a44 | 441 | goto done; |
245be530 | 442 | } |
3d328a44 | 443 | |
2167239a | 444 | ret = sm2_sig_verify(key, sig, e); |
3d328a44 JL |
445 | |
446 | done: | |
447 | BN_free(e); | |
448 | return ret; | |
449 | } | |
450 | ||
32ab57cb SL |
451 | int ossl_sm2_internal_sign(const unsigned char *dgst, int dgstlen, |
452 | unsigned char *sig, unsigned int *siglen, | |
453 | EC_KEY *eckey) | |
3d328a44 JL |
454 | { |
455 | BIGNUM *e = NULL; | |
456 | ECDSA_SIG *s = NULL; | |
245be530 | 457 | int sigleni; |
3d328a44 JL |
458 | int ret = -1; |
459 | ||
1fa2bf9b BE |
460 | if (sig == NULL) { |
461 | ERR_raise(ERR_LIB_SM2, ERR_R_PASSED_NULL_PARAMETER); | |
462 | goto done; | |
463 | } | |
464 | ||
3d328a44 | 465 | e = BN_bin2bn(dgst, dgstlen, NULL); |
245be530 | 466 | if (e == NULL) { |
9311d0c4 | 467 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
468 | goto done; |
469 | } | |
3d328a44 | 470 | |
2167239a | 471 | s = sm2_sig_gen(eckey, e); |
5ccada09 | 472 | if (s == NULL) { |
9311d0c4 | 473 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
5ccada09 SL |
474 | goto done; |
475 | } | |
3d328a44 | 476 | |
1fa2bf9b | 477 | sigleni = i2d_ECDSA_SIG(s, &sig); |
245be530 | 478 | if (sigleni < 0) { |
9311d0c4 | 479 | ERR_raise(ERR_LIB_SM2, ERR_R_INTERNAL_ERROR); |
245be530 MC |
480 | goto done; |
481 | } | |
482 | *siglen = (unsigned int)sigleni; | |
3d328a44 | 483 | |
67cc2bae | 484 | ret = 1; |
3d328a44 JL |
485 | |
486 | done: | |
487 | ECDSA_SIG_free(s); | |
488 | BN_free(e); | |
489 | return ret; | |
490 | } | |
491 | ||
32ab57cb SL |
492 | int ossl_sm2_internal_verify(const unsigned char *dgst, int dgstlen, |
493 | const unsigned char *sig, int sig_len, | |
494 | EC_KEY *eckey) | |
3d328a44 JL |
495 | { |
496 | ECDSA_SIG *s = NULL; | |
497 | BIGNUM *e = NULL; | |
498 | const unsigned char *p = sig; | |
499 | unsigned char *der = NULL; | |
500 | int derlen = -1; | |
501 | int ret = -1; | |
502 | ||
3d328a44 | 503 | s = ECDSA_SIG_new(); |
245be530 | 504 | if (s == NULL) { |
e077455e | 505 | ERR_raise(ERR_LIB_SM2, ERR_R_ECDSA_LIB); |
3d328a44 | 506 | goto done; |
245be530 MC |
507 | } |
508 | if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) { | |
9311d0c4 | 509 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 510 | goto done; |
245be530 | 511 | } |
3d328a44 JL |
512 | /* Ensure signature uses DER and doesn't have trailing garbage */ |
513 | derlen = i2d_ECDSA_SIG(s, &der); | |
245be530 | 514 | if (derlen != sig_len || memcmp(sig, der, derlen) != 0) { |
9311d0c4 | 515 | ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_ENCODING); |
3d328a44 | 516 | goto done; |
245be530 | 517 | } |
3d328a44 JL |
518 | |
519 | e = BN_bin2bn(dgst, dgstlen, NULL); | |
245be530 | 520 | if (e == NULL) { |
9311d0c4 | 521 | ERR_raise(ERR_LIB_SM2, ERR_R_BN_LIB); |
245be530 MC |
522 | goto done; |
523 | } | |
3d328a44 | 524 | |
2167239a | 525 | ret = sm2_sig_verify(eckey, s, e); |
3d328a44 JL |
526 | |
527 | done: | |
528 | OPENSSL_free(der); | |
529 | BN_free(e); | |
530 | ECDSA_SIG_free(s); | |
531 | return ret; | |
532 | } |