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Commit | Line | Data |
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14a7cfb3 | 1 | /* |
28428130 | 2 | * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved. |
aa8f3d76 | 3 | * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved |
14a7cfb3 | 4 | * |
aa6bb135 RS |
5 | * Licensed under the OpenSSL license (the "License"). You may not use |
6 | * this file except in compliance with the License. You can obtain a copy | |
7 | * in the file LICENSE in the source distribution or at | |
8 | * https://www.openssl.org/source/license.html | |
14a7cfb3 | 9 | */ |
aa6bb135 | 10 | |
5f8dd0f8 | 11 | #include "internal/cryptlib.h" |
5454829a | 12 | #include <string.h> |
14a7cfb3 | 13 | #include "ec_lcl.h" |
cd420b0b | 14 | #include "internal/refcount.h" |
14a7cfb3 | 15 | #include <openssl/err.h> |
3c27208f | 16 | #include <openssl/engine.h> |
14a7cfb3 BM |
17 | |
18 | EC_KEY *EC_KEY_new(void) | |
0f113f3e | 19 | { |
28572b57 | 20 | return EC_KEY_new_method(NULL); |
0f113f3e | 21 | } |
14a7cfb3 | 22 | |
9dd84053 | 23 | EC_KEY *EC_KEY_new_by_curve_name(int nid) |
0f113f3e MC |
24 | { |
25 | EC_KEY *ret = EC_KEY_new(); | |
26 | if (ret == NULL) | |
27 | return NULL; | |
28 | ret->group = EC_GROUP_new_by_curve_name(nid); | |
29 | if (ret->group == NULL) { | |
30 | EC_KEY_free(ret); | |
31 | return NULL; | |
32 | } | |
91e7bcc2 DSH |
33 | if (ret->meth->set_group != NULL |
34 | && ret->meth->set_group(ret, ret->group) == 0) { | |
3475bc96 DSH |
35 | EC_KEY_free(ret); |
36 | return NULL; | |
37 | } | |
0f113f3e MC |
38 | return ret; |
39 | } | |
14a7cfb3 BM |
40 | |
41 | void EC_KEY_free(EC_KEY *r) | |
0f113f3e MC |
42 | { |
43 | int i; | |
14a7cfb3 | 44 | |
0f113f3e MC |
45 | if (r == NULL) |
46 | return; | |
14a7cfb3 | 47 | |
2f545ae4 | 48 | CRYPTO_DOWN_REF(&r->references, &i, r->lock); |
f3f1cf84 | 49 | REF_PRINT_COUNT("EC_KEY", r); |
0f113f3e MC |
50 | if (i > 0) |
51 | return; | |
f3f1cf84 | 52 | REF_ASSERT_ISNT(i < 0); |
14a7cfb3 | 53 | |
0c5d725e | 54 | if (r->meth != NULL && r->meth->finish != NULL) |
0d6ff6d3 DSH |
55 | r->meth->finish(r); |
56 | ||
51966416 | 57 | #ifndef OPENSSL_NO_ENGINE |
7c96dbcd | 58 | ENGINE_finish(r->engine); |
51966416 DSH |
59 | #endif |
60 | ||
6903e2e7 DSH |
61 | if (r->group && r->group->meth->keyfinish) |
62 | r->group->meth->keyfinish(r); | |
63 | ||
3aef36ff | 64 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data); |
9b398ef2 | 65 | CRYPTO_THREAD_lock_free(r->lock); |
8fdc3734 RS |
66 | EC_GROUP_free(r->group); |
67 | EC_POINT_free(r->pub_key); | |
23a1d5e9 | 68 | BN_clear_free(r->priv_key); |
14a7cfb3 | 69 | |
4b45c6e5 | 70 | OPENSSL_clear_free((void *)r, sizeof(EC_KEY)); |
0f113f3e | 71 | } |
14a7cfb3 | 72 | |
4a9a0d9b | 73 | EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) |
0f113f3e | 74 | { |
0f113f3e MC |
75 | if (dest == NULL || src == NULL) { |
76 | ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER); | |
77 | return NULL; | |
78 | } | |
ea0392b9 | 79 | if (src->meth != dest->meth) { |
91e7bcc2 | 80 | if (dest->meth->finish != NULL) |
ea0392b9 | 81 | dest->meth->finish(dest); |
6903e2e7 DSH |
82 | if (dest->group && dest->group->meth->keyfinish) |
83 | dest->group->meth->keyfinish(dest); | |
ea0392b9 | 84 | #ifndef OPENSSL_NO_ENGINE |
7c96dbcd | 85 | if (ENGINE_finish(dest->engine) == 0) |
ea0392b9 DSH |
86 | return 0; |
87 | dest->engine = NULL; | |
88 | #endif | |
89 | } | |
0f113f3e | 90 | /* copy the parameters */ |
91e7bcc2 | 91 | if (src->group != NULL) { |
0f113f3e MC |
92 | const EC_METHOD *meth = EC_GROUP_method_of(src->group); |
93 | /* clear the old group */ | |
8fdc3734 | 94 | EC_GROUP_free(dest->group); |
0f113f3e MC |
95 | dest->group = EC_GROUP_new(meth); |
96 | if (dest->group == NULL) | |
97 | return NULL; | |
98 | if (!EC_GROUP_copy(dest->group, src->group)) | |
99 | return NULL; | |
40a8643a MC |
100 | |
101 | /* copy the public key */ | |
102 | if (src->pub_key != NULL) { | |
103 | EC_POINT_free(dest->pub_key); | |
104 | dest->pub_key = EC_POINT_new(src->group); | |
105 | if (dest->pub_key == NULL) | |
106 | return NULL; | |
107 | if (!EC_POINT_copy(dest->pub_key, src->pub_key)) | |
108 | return NULL; | |
109 | } | |
110 | /* copy the private key */ | |
111 | if (src->priv_key != NULL) { | |
112 | if (dest->priv_key == NULL) { | |
113 | dest->priv_key = BN_new(); | |
114 | if (dest->priv_key == NULL) | |
115 | return NULL; | |
116 | } | |
117 | if (!BN_copy(dest->priv_key, src->priv_key)) | |
118 | return NULL; | |
119 | if (src->group->meth->keycopy | |
120 | && src->group->meth->keycopy(dest, src) == 0) | |
0f113f3e MC |
121 | return NULL; |
122 | } | |
0f113f3e | 123 | } |
0f113f3e | 124 | |
6903e2e7 | 125 | |
0f113f3e MC |
126 | /* copy the rest */ |
127 | dest->enc_flag = src->enc_flag; | |
128 | dest->conv_form = src->conv_form; | |
129 | dest->version = src->version; | |
130 | dest->flags = src->flags; | |
3aef36ff RS |
131 | if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, |
132 | &dest->ex_data, &src->ex_data)) | |
133 | return NULL; | |
0f113f3e | 134 | |
ea0392b9 DSH |
135 | if (src->meth != dest->meth) { |
136 | #ifndef OPENSSL_NO_ENGINE | |
91e7bcc2 DSH |
137 | if (src->engine != NULL && ENGINE_init(src->engine) == 0) |
138 | return NULL; | |
ea0392b9 DSH |
139 | dest->engine = src->engine; |
140 | #endif | |
141 | dest->meth = src->meth; | |
142 | } | |
143 | ||
91e7bcc2 DSH |
144 | if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0) |
145 | return NULL; | |
ea0392b9 | 146 | |
0f113f3e MC |
147 | return dest; |
148 | } | |
14a7cfb3 | 149 | |
4a9a0d9b | 150 | EC_KEY *EC_KEY_dup(const EC_KEY *ec_key) |
0f113f3e | 151 | { |
ea0392b9 | 152 | EC_KEY *ret = EC_KEY_new_method(ec_key->engine); |
3aef36ff | 153 | |
0f113f3e MC |
154 | if (ret == NULL) |
155 | return NULL; | |
9b398ef2 | 156 | |
0f113f3e MC |
157 | if (EC_KEY_copy(ret, ec_key) == NULL) { |
158 | EC_KEY_free(ret); | |
159 | return NULL; | |
160 | } | |
161 | return ret; | |
162 | } | |
14a7cfb3 | 163 | |
e172d60d | 164 | int EC_KEY_up_ref(EC_KEY *r) |
0f113f3e | 165 | { |
9b398ef2 AG |
166 | int i; |
167 | ||
2f545ae4 | 168 | if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0) |
9b398ef2 | 169 | return 0; |
f3f1cf84 RS |
170 | |
171 | REF_PRINT_COUNT("EC_KEY", r); | |
172 | REF_ASSERT_ISNT(i < 2); | |
0f113f3e MC |
173 | return ((i > 1) ? 1 : 0); |
174 | } | |
e172d60d | 175 | |
d1da335c RL |
176 | ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey) |
177 | { | |
178 | return eckey->engine; | |
179 | } | |
180 | ||
14a7cfb3 | 181 | int EC_KEY_generate_key(EC_KEY *eckey) |
0f113f3e | 182 | { |
91e7bcc2 | 183 | if (eckey == NULL || eckey->group == NULL) { |
0f113f3e MC |
184 | ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); |
185 | return 0; | |
186 | } | |
91e7bcc2 | 187 | if (eckey->meth->keygen != NULL) |
5a6a1029 DSH |
188 | return eckey->meth->keygen(eckey); |
189 | ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | int ossl_ec_key_gen(EC_KEY *eckey) | |
77470e98 | 194 | { |
77470e98 DSH |
195 | return eckey->group->meth->keygen(eckey); |
196 | } | |
197 | ||
198 | int ec_key_simple_generate_key(EC_KEY *eckey) | |
5a6a1029 DSH |
199 | { |
200 | int ok = 0; | |
201 | BN_CTX *ctx = NULL; | |
be2e334f DSH |
202 | BIGNUM *priv_key = NULL; |
203 | const BIGNUM *order = NULL; | |
5a6a1029 | 204 | EC_POINT *pub_key = NULL; |
0f113f3e | 205 | |
0f113f3e MC |
206 | if ((ctx = BN_CTX_new()) == NULL) |
207 | goto err; | |
208 | ||
209 | if (eckey->priv_key == NULL) { | |
210 | priv_key = BN_new(); | |
211 | if (priv_key == NULL) | |
212 | goto err; | |
213 | } else | |
214 | priv_key = eckey->priv_key; | |
215 | ||
be2e334f DSH |
216 | order = EC_GROUP_get0_order(eckey->group); |
217 | if (order == NULL) | |
0f113f3e MC |
218 | goto err; |
219 | ||
220 | do | |
ddc6a5c8 | 221 | if (!BN_priv_rand_range(priv_key, order)) |
0f113f3e MC |
222 | goto err; |
223 | while (BN_is_zero(priv_key)) ; | |
224 | ||
225 | if (eckey->pub_key == NULL) { | |
226 | pub_key = EC_POINT_new(eckey->group); | |
227 | if (pub_key == NULL) | |
228 | goto err; | |
229 | } else | |
230 | pub_key = eckey->pub_key; | |
231 | ||
232 | if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) | |
233 | goto err; | |
234 | ||
235 | eckey->priv_key = priv_key; | |
236 | eckey->pub_key = pub_key; | |
237 | ||
238 | ok = 1; | |
239 | ||
240 | err: | |
8fdc3734 | 241 | if (eckey->pub_key == NULL) |
0f113f3e | 242 | EC_POINT_free(pub_key); |
23a1d5e9 | 243 | if (eckey->priv_key != priv_key) |
0f113f3e | 244 | BN_free(priv_key); |
23a1d5e9 | 245 | BN_CTX_free(ctx); |
77470e98 DSH |
246 | return ok; |
247 | } | |
248 | ||
249 | int ec_key_simple_generate_public_key(EC_KEY *eckey) | |
250 | { | |
251 | return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL, | |
252 | NULL, NULL); | |
0f113f3e | 253 | } |
14a7cfb3 BM |
254 | |
255 | int EC_KEY_check_key(const EC_KEY *eckey) | |
77470e98 DSH |
256 | { |
257 | if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) { | |
258 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | if (eckey->group->meth->keycheck == NULL) { | |
263 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | return eckey->group->meth->keycheck(eckey); | |
268 | } | |
269 | ||
270 | int ec_key_simple_check_key(const EC_KEY *eckey) | |
0f113f3e MC |
271 | { |
272 | int ok = 0; | |
273 | BN_CTX *ctx = NULL; | |
274 | const BIGNUM *order = NULL; | |
275 | EC_POINT *point = NULL; | |
276 | ||
91e7bcc2 | 277 | if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) { |
77470e98 | 278 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); |
0f113f3e MC |
279 | return 0; |
280 | } | |
281 | ||
282 | if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) { | |
77470e98 | 283 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY); |
0f113f3e MC |
284 | goto err; |
285 | } | |
286 | ||
287 | if ((ctx = BN_CTX_new()) == NULL) | |
288 | goto err; | |
289 | if ((point = EC_POINT_new(eckey->group)) == NULL) | |
290 | goto err; | |
291 | ||
292 | /* testing whether the pub_key is on the elliptic curve */ | |
68886be7 | 293 | if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) { |
77470e98 | 294 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE); |
0f113f3e MC |
295 | goto err; |
296 | } | |
297 | /* testing whether pub_key * order is the point at infinity */ | |
298 | order = eckey->group->order; | |
299 | if (BN_is_zero(order)) { | |
77470e98 | 300 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER); |
0f113f3e MC |
301 | goto err; |
302 | } | |
303 | if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { | |
77470e98 | 304 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB); |
0f113f3e MC |
305 | goto err; |
306 | } | |
307 | if (!EC_POINT_is_at_infinity(eckey->group, point)) { | |
77470e98 | 308 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER); |
0f113f3e MC |
309 | goto err; |
310 | } | |
311 | /* | |
312 | * in case the priv_key is present : check if generator * priv_key == | |
313 | * pub_key | |
314 | */ | |
91e7bcc2 | 315 | if (eckey->priv_key != NULL) { |
0f113f3e | 316 | if (BN_cmp(eckey->priv_key, order) >= 0) { |
77470e98 | 317 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER); |
0f113f3e MC |
318 | goto err; |
319 | } | |
320 | if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, | |
321 | NULL, NULL, ctx)) { | |
77470e98 | 322 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB); |
0f113f3e MC |
323 | goto err; |
324 | } | |
325 | if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { | |
77470e98 | 326 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY); |
0f113f3e MC |
327 | goto err; |
328 | } | |
329 | } | |
330 | ok = 1; | |
331 | err: | |
23a1d5e9 | 332 | BN_CTX_free(ctx); |
8fdc3734 | 333 | EC_POINT_free(point); |
77470e98 | 334 | return ok; |
0f113f3e MC |
335 | } |
336 | ||
337 | int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, | |
338 | BIGNUM *y) | |
339 | { | |
340 | BN_CTX *ctx = NULL; | |
341 | BIGNUM *tx, *ty; | |
342 | EC_POINT *point = NULL; | |
8d11b7c7 | 343 | int ok = 0; |
0f113f3e | 344 | |
91e7bcc2 | 345 | if (key == NULL || key->group == NULL || x == NULL || y == NULL) { |
0f113f3e MC |
346 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, |
347 | ERR_R_PASSED_NULL_PARAMETER); | |
348 | return 0; | |
349 | } | |
350 | ctx = BN_CTX_new(); | |
90945fa3 | 351 | if (ctx == NULL) |
2ab851b7 | 352 | return 0; |
0f113f3e | 353 | |
2ab851b7 | 354 | BN_CTX_start(ctx); |
0f113f3e MC |
355 | point = EC_POINT_new(key->group); |
356 | ||
90945fa3 | 357 | if (point == NULL) |
0f113f3e MC |
358 | goto err; |
359 | ||
8d11b7c7 MC |
360 | tx = BN_CTX_get(ctx); |
361 | ty = BN_CTX_get(ctx); | |
dd67493c BB |
362 | if (ty == NULL) |
363 | goto err; | |
8d11b7c7 | 364 | |
9cc570d4 MC |
365 | if (!EC_POINT_set_affine_coordinates(key->group, point, x, y, ctx)) |
366 | goto err; | |
367 | if (!EC_POINT_get_affine_coordinates(key->group, point, tx, ty, ctx)) | |
368 | goto err; | |
0f113f3e | 369 | |
0f113f3e MC |
370 | /* |
371 | * Check if retrieved coordinates match originals and are less than field | |
372 | * order: if not values are out of range. | |
373 | */ | |
374 | if (BN_cmp(x, tx) || BN_cmp(y, ty) | |
375 | || (BN_cmp(x, key->group->field) >= 0) | |
376 | || (BN_cmp(y, key->group->field) >= 0)) { | |
377 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, | |
378 | EC_R_COORDINATES_OUT_OF_RANGE); | |
379 | goto err; | |
380 | } | |
381 | ||
382 | if (!EC_KEY_set_public_key(key, point)) | |
383 | goto err; | |
384 | ||
385 | if (EC_KEY_check_key(key) == 0) | |
386 | goto err; | |
387 | ||
388 | ok = 1; | |
389 | ||
390 | err: | |
2ab851b7 | 391 | BN_CTX_end(ctx); |
23a1d5e9 | 392 | BN_CTX_free(ctx); |
8fdc3734 | 393 | EC_POINT_free(point); |
0f113f3e MC |
394 | return ok; |
395 | ||
396 | } | |
fef1c40b | 397 | |
9dd84053 | 398 | const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) |
0f113f3e MC |
399 | { |
400 | return key->group; | |
401 | } | |
9dd84053 NL |
402 | |
403 | int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group) | |
0f113f3e | 404 | { |
91e7bcc2 | 405 | if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0) |
3475bc96 | 406 | return 0; |
8fdc3734 | 407 | EC_GROUP_free(key->group); |
0f113f3e MC |
408 | key->group = EC_GROUP_dup(group); |
409 | return (key->group == NULL) ? 0 : 1; | |
410 | } | |
9dd84053 NL |
411 | |
412 | const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key) | |
0f113f3e MC |
413 | { |
414 | return key->priv_key; | |
415 | } | |
9dd84053 NL |
416 | |
417 | int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key) | |
0f113f3e | 418 | { |
6903e2e7 DSH |
419 | if (key->group == NULL || key->group->meth == NULL) |
420 | return 0; | |
acde647f KY |
421 | if (key->group->meth->set_private != NULL |
422 | && key->group->meth->set_private(key, priv_key) == 0) | |
6903e2e7 | 423 | return 0; |
91e7bcc2 DSH |
424 | if (key->meth->set_private != NULL |
425 | && key->meth->set_private(key, priv_key) == 0) | |
3475bc96 | 426 | return 0; |
23a1d5e9 | 427 | BN_clear_free(key->priv_key); |
0f113f3e MC |
428 | key->priv_key = BN_dup(priv_key); |
429 | return (key->priv_key == NULL) ? 0 : 1; | |
430 | } | |
9dd84053 NL |
431 | |
432 | const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key) | |
0f113f3e MC |
433 | { |
434 | return key->pub_key; | |
435 | } | |
9dd84053 NL |
436 | |
437 | int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key) | |
0f113f3e | 438 | { |
91e7bcc2 DSH |
439 | if (key->meth->set_public != NULL |
440 | && key->meth->set_public(key, pub_key) == 0) | |
3475bc96 | 441 | return 0; |
8fdc3734 | 442 | EC_POINT_free(key->pub_key); |
0f113f3e MC |
443 | key->pub_key = EC_POINT_dup(pub_key, key->group); |
444 | return (key->pub_key == NULL) ? 0 : 1; | |
445 | } | |
9dd84053 NL |
446 | |
447 | unsigned int EC_KEY_get_enc_flags(const EC_KEY *key) | |
0f113f3e MC |
448 | { |
449 | return key->enc_flag; | |
450 | } | |
9dd84053 NL |
451 | |
452 | void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags) | |
0f113f3e MC |
453 | { |
454 | key->enc_flag = flags; | |
455 | } | |
9dd84053 NL |
456 | |
457 | point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key) | |
0f113f3e MC |
458 | { |
459 | return key->conv_form; | |
460 | } | |
9dd84053 NL |
461 | |
462 | void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform) | |
0f113f3e MC |
463 | { |
464 | key->conv_form = cform; | |
465 | if (key->group != NULL) | |
466 | EC_GROUP_set_point_conversion_form(key->group, cform); | |
467 | } | |
9dd84053 | 468 | |
9dd84053 | 469 | void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) |
0f113f3e MC |
470 | { |
471 | if (key->group != NULL) | |
472 | EC_GROUP_set_asn1_flag(key->group, flag); | |
473 | } | |
9dd84053 NL |
474 | |
475 | int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx) | |
0f113f3e MC |
476 | { |
477 | if (key->group == NULL) | |
478 | return 0; | |
479 | return EC_GROUP_precompute_mult(key->group, ctx); | |
480 | } | |
cac4fb58 DSH |
481 | |
482 | int EC_KEY_get_flags(const EC_KEY *key) | |
0f113f3e MC |
483 | { |
484 | return key->flags; | |
485 | } | |
cac4fb58 DSH |
486 | |
487 | void EC_KEY_set_flags(EC_KEY *key, int flags) | |
0f113f3e MC |
488 | { |
489 | key->flags |= flags; | |
490 | } | |
cac4fb58 DSH |
491 | |
492 | void EC_KEY_clear_flags(EC_KEY *key, int flags) | |
0f113f3e MC |
493 | { |
494 | key->flags &= ~flags; | |
495 | } | |
981bd8a2 DSH |
496 | |
497 | size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form, | |
498 | unsigned char **pbuf, BN_CTX *ctx) | |
499 | { | |
500 | if (key == NULL || key->pub_key == NULL || key->group == NULL) | |
501 | return 0; | |
502 | return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx); | |
503 | } | |
504 | ||
505 | int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len, | |
506 | BN_CTX *ctx) | |
507 | { | |
508 | if (key == NULL || key->group == NULL) | |
509 | return 0; | |
510 | if (key->pub_key == NULL) | |
511 | key->pub_key = EC_POINT_new(key->group); | |
512 | if (key->pub_key == NULL) | |
513 | return 0; | |
6ea04154 DSH |
514 | if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0) |
515 | return 0; | |
516 | /* | |
517 | * Save the point conversion form. | |
518 | * For non-custom curves the first octet of the buffer (excluding | |
519 | * the last significant bit) contains the point conversion form. | |
520 | * EC_POINT_oct2point() has already performed sanity checking of | |
521 | * the buffer so we know it is valid. | |
522 | */ | |
523 | if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) | |
524 | key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01); | |
525 | return 1; | |
981bd8a2 | 526 | } |
cf241395 | 527 | |
700b8145 | 528 | size_t EC_KEY_priv2oct(const EC_KEY *eckey, |
25d57dc7 | 529 | unsigned char *buf, size_t len) |
cf241395 | 530 | { |
cf241395 DSH |
531 | if (eckey->group == NULL || eckey->group->meth == NULL) |
532 | return 0; | |
77470e98 DSH |
533 | if (eckey->group->meth->priv2oct == NULL) { |
534 | ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | return eckey->group->meth->priv2oct(eckey, buf, len); | |
539 | } | |
540 | ||
541 | size_t ec_key_simple_priv2oct(const EC_KEY *eckey, | |
542 | unsigned char *buf, size_t len) | |
543 | { | |
544 | size_t buf_len; | |
cf241395 | 545 | |
fe56d8e8 | 546 | buf_len = (EC_GROUP_order_bits(eckey->group) + 7) / 8; |
cf241395 DSH |
547 | if (eckey->priv_key == NULL) |
548 | return 0; | |
549 | if (buf == NULL) | |
550 | return buf_len; | |
551 | else if (len < buf_len) | |
552 | return 0; | |
553 | ||
cf241395 DSH |
554 | /* Octetstring may need leading zeros if BN is to short */ |
555 | ||
907e9500 | 556 | if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) { |
77470e98 | 557 | ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL); |
cf241395 DSH |
558 | return 0; |
559 | } | |
560 | ||
cf241395 DSH |
561 | return buf_len; |
562 | } | |
563 | ||
25d57dc7 | 564 | int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len) |
cf241395 DSH |
565 | { |
566 | if (eckey->group == NULL || eckey->group->meth == NULL) | |
567 | return 0; | |
77470e98 DSH |
568 | if (eckey->group->meth->oct2priv == NULL) { |
569 | ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
570 | return 0; | |
571 | } | |
572 | return eckey->group->meth->oct2priv(eckey, buf, len); | |
573 | } | |
cf241395 | 574 | |
25d57dc7 | 575 | int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len) |
77470e98 | 576 | { |
cf241395 DSH |
577 | if (eckey->priv_key == NULL) |
578 | eckey->priv_key = BN_secure_new(); | |
579 | if (eckey->priv_key == NULL) { | |
77470e98 | 580 | ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE); |
cf241395 DSH |
581 | return 0; |
582 | } | |
583 | eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key); | |
584 | if (eckey->priv_key == NULL) { | |
77470e98 | 585 | ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB); |
cf241395 DSH |
586 | return 0; |
587 | } | |
588 | return 1; | |
589 | } | |
7fc7d1a7 DSH |
590 | |
591 | size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf) | |
592 | { | |
593 | size_t len; | |
594 | unsigned char *buf; | |
cdb10bae | 595 | |
7fc7d1a7 | 596 | len = EC_KEY_priv2oct(eckey, NULL, 0); |
afcee950 RS |
597 | if (len == 0) |
598 | return 0; | |
cdb10bae RS |
599 | if ((buf = OPENSSL_malloc(len)) == NULL) { |
600 | ECerr(EC_F_EC_KEY_PRIV2BUF, ERR_R_MALLOC_FAILURE); | |
7fc7d1a7 | 601 | return 0; |
cdb10bae | 602 | } |
7fc7d1a7 DSH |
603 | len = EC_KEY_priv2oct(eckey, buf, len); |
604 | if (len == 0) { | |
605 | OPENSSL_free(buf); | |
606 | return 0; | |
607 | } | |
608 | *pbuf = buf; | |
609 | return len; | |
610 | } | |
4b0555ec DSH |
611 | |
612 | int EC_KEY_can_sign(const EC_KEY *eckey) | |
613 | { | |
614 | if (eckey->group == NULL || eckey->group->meth == NULL | |
615 | || (eckey->group->meth->flags & EC_FLAGS_NO_SIGN)) | |
616 | return 0; | |
617 | return 1; | |
618 | } |