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65e81670 | 1 | /* crypto/ec/ec_lib.c */ |
35b73a1f BM |
2 | /* |
3 | * Originally written by Bodo Moeller for the OpenSSL project. | |
4 | */ | |
65e81670 | 5 | /* ==================================================================== |
37c660ff | 6 | * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. |
65e81670 BM |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
65e81670 BM |
14 | * |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * openssl-core@openssl.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
7793f30e BM |
58 | /* ==================================================================== |
59 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
0f113f3e | 60 | * Binary polynomial ECC support in OpenSSL originally developed by |
7793f30e BM |
61 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. |
62 | */ | |
65e81670 | 63 | |
c4b36ff4 BM |
64 | #include <string.h> |
65 | ||
0657bf9c | 66 | #include <openssl/err.h> |
bb62a8b0 | 67 | #include <openssl/opensslv.h> |
0657bf9c | 68 | |
65e81670 | 69 | #include "ec_lcl.h" |
0657bf9c | 70 | |
b597aab8 | 71 | const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT; |
bb62a8b0 | 72 | |
0657bf9c BM |
73 | /* functions for EC_GROUP objects */ |
74 | ||
75 | EC_GROUP *EC_GROUP_new(const EC_METHOD *meth) | |
0f113f3e MC |
76 | { |
77 | EC_GROUP *ret; | |
78 | ||
79 | if (meth == NULL) { | |
80 | ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL); | |
81 | return NULL; | |
82 | } | |
83 | if (meth->group_init == 0) { | |
84 | ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | ret = OPENSSL_malloc(sizeof *ret); | |
89 | if (ret == NULL) { | |
90 | ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE); | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | ret->meth = meth; | |
95 | ||
96 | ret->extra_data = NULL; | |
97 | ret->mont_data = NULL; | |
98 | ||
99 | ret->generator = NULL; | |
100 | ret->order = BN_new(); | |
101 | ret->cofactor = NULL; | |
102 | if (!ret->order) | |
103 | goto err; | |
104 | ret->cofactor = BN_new(); | |
105 | if (!ret->cofactor) | |
106 | goto err; | |
107 | ||
108 | ret->curve_name = 0; | |
86f300d3 | 109 | ret->asn1_flag = OPENSSL_EC_NAMED_CURVE; |
0f113f3e MC |
110 | ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; |
111 | ||
112 | ret->seed = NULL; | |
113 | ret->seed_len = 0; | |
114 | ||
115 | if (!meth->group_init(ret)) | |
116 | goto err; | |
117 | ||
118 | return ret; | |
119 | err: | |
120 | if (ret->order) | |
121 | BN_free(ret->order); | |
122 | if (ret->cofactor) | |
123 | BN_free(ret->cofactor); | |
124 | OPENSSL_free(ret); | |
125 | return NULL; | |
126 | } | |
0657bf9c | 127 | |
0657bf9c | 128 | void EC_GROUP_free(EC_GROUP *group) |
0f113f3e MC |
129 | { |
130 | if (!group) | |
131 | return; | |
7711de24 | 132 | |
0f113f3e MC |
133 | if (group->meth->group_finish != 0) |
134 | group->meth->group_finish(group); | |
df9cc153 | 135 | |
0f113f3e | 136 | EC_EX_DATA_free_all_data(&group->extra_data); |
df9cc153 | 137 | |
0f113f3e MC |
138 | if (group->mont_data) |
139 | BN_MONT_CTX_free(group->mont_data); | |
f54be179 | 140 | |
8fdc3734 | 141 | EC_POINT_free(group->generator); |
0f113f3e MC |
142 | BN_free(group->order); |
143 | BN_free(group->cofactor); | |
b6db386f | 144 | |
0f113f3e MC |
145 | if (group->seed) |
146 | OPENSSL_free(group->seed); | |
458c2917 | 147 | |
0f113f3e MC |
148 | OPENSSL_free(group); |
149 | } | |
0657bf9c BM |
150 | |
151 | void EC_GROUP_clear_free(EC_GROUP *group) | |
0f113f3e MC |
152 | { |
153 | if (!group) | |
154 | return; | |
df9cc153 | 155 | |
0f113f3e MC |
156 | if (group->meth->group_clear_finish != 0) |
157 | group->meth->group_clear_finish(group); | |
158 | else if (group->meth->group_finish != 0) | |
159 | group->meth->group_finish(group); | |
df9cc153 | 160 | |
0f113f3e | 161 | EC_EX_DATA_clear_free_all_data(&group->extra_data); |
f54be179 | 162 | |
0f113f3e MC |
163 | if (group->mont_data) |
164 | BN_MONT_CTX_free(group->mont_data); | |
b6db386f | 165 | |
8fdc3734 | 166 | EC_POINT_clear_free(group->generator); |
0f113f3e MC |
167 | BN_clear_free(group->order); |
168 | BN_clear_free(group->cofactor); | |
458c2917 | 169 | |
0f113f3e MC |
170 | if (group->seed) { |
171 | OPENSSL_cleanse(group->seed, group->seed_len); | |
172 | OPENSSL_free(group->seed); | |
173 | } | |
0657bf9c | 174 | |
0f113f3e MC |
175 | OPENSSL_cleanse(group, sizeof *group); |
176 | OPENSSL_free(group); | |
177 | } | |
0657bf9c BM |
178 | |
179 | int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src) | |
0f113f3e MC |
180 | { |
181 | EC_EXTRA_DATA *d; | |
182 | ||
183 | if (dest->meth->group_copy == 0) { | |
184 | ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
185 | return 0; | |
186 | } | |
187 | if (dest->meth != src->meth) { | |
188 | ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS); | |
189 | return 0; | |
190 | } | |
191 | if (dest == src) | |
192 | return 1; | |
193 | ||
194 | EC_EX_DATA_free_all_data(&dest->extra_data); | |
195 | ||
196 | for (d = src->extra_data; d != NULL; d = d->next) { | |
197 | void *t = d->dup_func(d->data); | |
198 | ||
199 | if (t == NULL) | |
200 | return 0; | |
201 | if (!EC_EX_DATA_set_data | |
202 | (&dest->extra_data, t, d->dup_func, d->free_func, | |
203 | d->clear_free_func)) | |
204 | return 0; | |
205 | } | |
206 | ||
207 | if (src->mont_data != NULL) { | |
208 | if (dest->mont_data == NULL) { | |
209 | dest->mont_data = BN_MONT_CTX_new(); | |
210 | if (dest->mont_data == NULL) | |
211 | return 0; | |
212 | } | |
213 | if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data)) | |
214 | return 0; | |
215 | } else { | |
216 | /* src->generator == NULL */ | |
217 | if (dest->mont_data != NULL) { | |
218 | BN_MONT_CTX_free(dest->mont_data); | |
219 | dest->mont_data = NULL; | |
220 | } | |
221 | } | |
0657bf9c | 222 | |
0f113f3e MC |
223 | if (src->generator != NULL) { |
224 | if (dest->generator == NULL) { | |
225 | dest->generator = EC_POINT_new(dest); | |
226 | if (dest->generator == NULL) | |
227 | return 0; | |
228 | } | |
229 | if (!EC_POINT_copy(dest->generator, src->generator)) | |
230 | return 0; | |
231 | } else { | |
232 | /* src->generator == NULL */ | |
8fdc3734 RS |
233 | EC_POINT_clear_free(dest->generator); |
234 | dest->generator = NULL; | |
0f113f3e MC |
235 | } |
236 | ||
237 | if (!BN_copy(dest->order, src->order)) | |
238 | return 0; | |
239 | if (!BN_copy(dest->cofactor, src->cofactor)) | |
240 | return 0; | |
241 | ||
242 | dest->curve_name = src->curve_name; | |
243 | dest->asn1_flag = src->asn1_flag; | |
244 | dest->asn1_form = src->asn1_form; | |
245 | ||
246 | if (src->seed) { | |
247 | if (dest->seed) | |
248 | OPENSSL_free(dest->seed); | |
249 | dest->seed = OPENSSL_malloc(src->seed_len); | |
250 | if (dest->seed == NULL) | |
251 | return 0; | |
252 | if (!memcpy(dest->seed, src->seed, src->seed_len)) | |
253 | return 0; | |
254 | dest->seed_len = src->seed_len; | |
255 | } else { | |
256 | if (dest->seed) | |
257 | OPENSSL_free(dest->seed); | |
258 | dest->seed = NULL; | |
259 | dest->seed_len = 0; | |
260 | } | |
261 | ||
262 | return dest->meth->group_copy(dest, src); | |
263 | } | |
0657bf9c | 264 | |
7793f30e | 265 | EC_GROUP *EC_GROUP_dup(const EC_GROUP *a) |
0f113f3e MC |
266 | { |
267 | EC_GROUP *t = NULL; | |
268 | int ok = 0; | |
7793f30e | 269 | |
0f113f3e MC |
270 | if (a == NULL) |
271 | return NULL; | |
7793f30e | 272 | |
0f113f3e MC |
273 | if ((t = EC_GROUP_new(a->meth)) == NULL) |
274 | return (NULL); | |
275 | if (!EC_GROUP_copy(t, a)) | |
276 | goto err; | |
7793f30e | 277 | |
0f113f3e | 278 | ok = 1; |
7793f30e | 279 | |
0f113f3e MC |
280 | err: |
281 | if (!ok) { | |
8fdc3734 | 282 | EC_GROUP_free(t); |
0f113f3e | 283 | return NULL; |
8fdc3734 | 284 | } |
0f113f3e MC |
285 | return t; |
286 | } | |
7793f30e | 287 | |
48fe4d62 | 288 | const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group) |
0f113f3e MC |
289 | { |
290 | return group->meth; | |
291 | } | |
48fe4d62 | 292 | |
458c2917 | 293 | int EC_METHOD_get_field_type(const EC_METHOD *meth) |
0f113f3e MC |
294 | { |
295 | return meth->field_type; | |
296 | } | |
297 | ||
298 | int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, | |
299 | const BIGNUM *order, const BIGNUM *cofactor) | |
300 | { | |
301 | if (generator == NULL) { | |
302 | ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | if (group->generator == NULL) { | |
307 | group->generator = EC_POINT_new(group); | |
308 | if (group->generator == NULL) | |
309 | return 0; | |
310 | } | |
311 | if (!EC_POINT_copy(group->generator, generator)) | |
312 | return 0; | |
313 | ||
314 | if (order != NULL) { | |
315 | if (!BN_copy(group->order, order)) | |
316 | return 0; | |
317 | } else | |
318 | BN_zero(group->order); | |
319 | ||
320 | if (cofactor != NULL) { | |
321 | if (!BN_copy(group->cofactor, cofactor)) | |
322 | return 0; | |
323 | } else | |
324 | BN_zero(group->cofactor); | |
325 | ||
326 | /* | |
327 | * We ignore the return value because some groups have an order with | |
328 | * factors of two, which makes the Montgomery setup fail. | |
329 | * |group->mont_data| will be NULL in this case. | |
330 | */ | |
331 | ec_precompute_mont_data(group); | |
332 | ||
333 | return 1; | |
334 | } | |
bb62a8b0 | 335 | |
9dd84053 | 336 | const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group) |
0f113f3e MC |
337 | { |
338 | return group->generator; | |
339 | } | |
bb62a8b0 | 340 | |
f54be179 | 341 | BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group) |
0f113f3e MC |
342 | { |
343 | return group->mont_data; | |
344 | } | |
bb62a8b0 | 345 | |
b6db386f | 346 | int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) |
0f113f3e MC |
347 | { |
348 | if (!BN_copy(order, group->order)) | |
349 | return 0; | |
0657bf9c | 350 | |
0f113f3e MC |
351 | return !BN_is_zero(order); |
352 | } | |
0657bf9c | 353 | |
0f113f3e MC |
354 | int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, |
355 | BN_CTX *ctx) | |
356 | { | |
357 | if (!BN_copy(cofactor, group->cofactor)) | |
358 | return 0; | |
48fe4d62 | 359 | |
0f113f3e MC |
360 | return !BN_is_zero(group->cofactor); |
361 | } | |
48fe4d62 | 362 | |
7dc17a6c | 363 | void EC_GROUP_set_curve_name(EC_GROUP *group, int nid) |
0f113f3e MC |
364 | { |
365 | group->curve_name = nid; | |
366 | } | |
b6db386f | 367 | |
7dc17a6c | 368 | int EC_GROUP_get_curve_name(const EC_GROUP *group) |
0f113f3e MC |
369 | { |
370 | return group->curve_name; | |
371 | } | |
b6db386f | 372 | |
458c2917 | 373 | void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag) |
0f113f3e MC |
374 | { |
375 | group->asn1_flag = flag; | |
376 | } | |
458c2917 BM |
377 | |
378 | int EC_GROUP_get_asn1_flag(const EC_GROUP *group) | |
0f113f3e MC |
379 | { |
380 | return group->asn1_flag; | |
381 | } | |
458c2917 | 382 | |
0f113f3e | 383 | void EC_GROUP_set_point_conversion_form(EC_GROUP *group, |
254ef80d | 384 | point_conversion_form_t form) |
0f113f3e MC |
385 | { |
386 | group->asn1_form = form; | |
387 | } | |
254ef80d | 388 | |
0f113f3e MC |
389 | point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP |
390 | *group) | |
391 | { | |
392 | return group->asn1_form; | |
393 | } | |
254ef80d | 394 | |
5f3d6f70 | 395 | size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len) |
0f113f3e MC |
396 | { |
397 | if (group->seed) { | |
398 | OPENSSL_free(group->seed); | |
399 | group->seed = NULL; | |
400 | group->seed_len = 0; | |
401 | } | |
5f3d6f70 | 402 | |
0f113f3e MC |
403 | if (!len || !p) |
404 | return 1; | |
5f3d6f70 | 405 | |
0f113f3e MC |
406 | if ((group->seed = OPENSSL_malloc(len)) == NULL) |
407 | return 0; | |
408 | memcpy(group->seed, p, len); | |
409 | group->seed_len = len; | |
5f3d6f70 | 410 | |
0f113f3e MC |
411 | return len; |
412 | } | |
5f3d6f70 BM |
413 | |
414 | unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group) | |
0f113f3e MC |
415 | { |
416 | return group->seed; | |
417 | } | |
5f3d6f70 BM |
418 | |
419 | size_t EC_GROUP_get_seed_len(const EC_GROUP *group) | |
0f113f3e MC |
420 | { |
421 | return group->seed_len; | |
422 | } | |
423 | ||
424 | int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, | |
425 | const BIGNUM *b, BN_CTX *ctx) | |
426 | { | |
427 | if (group->meth->group_set_curve == 0) { | |
428 | ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
429 | return 0; | |
430 | } | |
431 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
432 | } | |
433 | ||
434 | int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
435 | BIGNUM *b, BN_CTX *ctx) | |
436 | { | |
437 | if (group->meth->group_get_curve == 0) { | |
438 | ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
439 | return 0; | |
440 | } | |
441 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
442 | } | |
7793f30e | 443 | |
b3310161 | 444 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
445 | int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
446 | const BIGNUM *b, BN_CTX *ctx) | |
447 | { | |
448 | if (group->meth->group_set_curve == 0) { | |
449 | ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, | |
450 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
451 | return 0; | |
452 | } | |
453 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
454 | } | |
455 | ||
456 | int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
457 | BIGNUM *b, BN_CTX *ctx) | |
458 | { | |
459 | if (group->meth->group_get_curve == 0) { | |
460 | ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, | |
461 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
462 | return 0; | |
463 | } | |
464 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
465 | } | |
b3310161 | 466 | #endif |
7793f30e BM |
467 | |
468 | int EC_GROUP_get_degree(const EC_GROUP *group) | |
0f113f3e MC |
469 | { |
470 | if (group->meth->group_get_degree == 0) { | |
471 | ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
472 | return 0; | |
473 | } | |
474 | return group->meth->group_get_degree(group); | |
475 | } | |
48fe4d62 | 476 | |
17d6bb81 | 477 | int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx) |
0f113f3e MC |
478 | { |
479 | if (group->meth->group_check_discriminant == 0) { | |
480 | ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, | |
481 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
482 | return 0; | |
483 | } | |
484 | return group->meth->group_check_discriminant(group, ctx); | |
485 | } | |
af28dd6c | 486 | |
ada0e717 | 487 | int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx) |
0f113f3e MC |
488 | { |
489 | int r = 0; | |
490 | BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; | |
491 | BN_CTX *ctx_new = NULL; | |
492 | ||
493 | /* compare the field types */ | |
494 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) != | |
495 | EC_METHOD_get_field_type(EC_GROUP_method_of(b))) | |
496 | return 1; | |
497 | /* compare the curve name (if present in both) */ | |
498 | if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && | |
499 | EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) | |
500 | return 1; | |
501 | ||
502 | if (!ctx) | |
503 | ctx_new = ctx = BN_CTX_new(); | |
504 | if (!ctx) | |
505 | return -1; | |
506 | ||
507 | BN_CTX_start(ctx); | |
508 | a1 = BN_CTX_get(ctx); | |
509 | a2 = BN_CTX_get(ctx); | |
510 | a3 = BN_CTX_get(ctx); | |
511 | b1 = BN_CTX_get(ctx); | |
512 | b2 = BN_CTX_get(ctx); | |
513 | b3 = BN_CTX_get(ctx); | |
514 | if (!b3) { | |
515 | BN_CTX_end(ctx); | |
516 | if (ctx_new) | |
517 | BN_CTX_free(ctx); | |
518 | return -1; | |
519 | } | |
520 | ||
521 | /* | |
522 | * XXX This approach assumes that the external representation of curves | |
523 | * over the same field type is the same. | |
524 | */ | |
525 | if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || | |
526 | !b->meth->group_get_curve(b, b1, b2, b3, ctx)) | |
527 | r = 1; | |
528 | ||
529 | if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3)) | |
530 | r = 1; | |
531 | ||
532 | /* XXX EC_POINT_cmp() assumes that the methods are equal */ | |
533 | if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), | |
534 | EC_GROUP_get0_generator(b), ctx)) | |
535 | r = 1; | |
536 | ||
537 | if (!r) { | |
538 | /* compare the order and cofactor */ | |
539 | if (!EC_GROUP_get_order(a, a1, ctx) || | |
540 | !EC_GROUP_get_order(b, b1, ctx) || | |
541 | !EC_GROUP_get_cofactor(a, a2, ctx) || | |
542 | !EC_GROUP_get_cofactor(b, b2, ctx)) { | |
543 | BN_CTX_end(ctx); | |
544 | if (ctx_new) | |
545 | BN_CTX_free(ctx); | |
546 | return -1; | |
547 | } | |
548 | if (BN_cmp(a1, b1) || BN_cmp(a2, b2)) | |
549 | r = 1; | |
550 | } | |
551 | ||
552 | BN_CTX_end(ctx); | |
553 | if (ctx_new) | |
554 | BN_CTX_free(ctx); | |
ada0e717 | 555 | |
0f113f3e MC |
556 | return r; |
557 | } | |
ada0e717 | 558 | |
df9cc153 | 559 | /* this has 'package' visibility */ |
9dd84053 | 560 | int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data, |
0f113f3e MC |
561 | void *(*dup_func) (void *), |
562 | void (*free_func) (void *), | |
563 | void (*clear_free_func) (void *)) | |
564 | { | |
565 | EC_EXTRA_DATA *d; | |
566 | ||
567 | if (ex_data == NULL) | |
568 | return 0; | |
569 | ||
570 | for (d = *ex_data; d != NULL; d = d->next) { | |
571 | if (d->dup_func == dup_func && d->free_func == free_func | |
572 | && d->clear_free_func == clear_free_func) { | |
573 | ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL); | |
574 | return 0; | |
575 | } | |
576 | } | |
df9cc153 | 577 | |
0f113f3e MC |
578 | if (data == NULL) |
579 | /* no explicit entry needed */ | |
580 | return 1; | |
ba729265 | 581 | |
0f113f3e MC |
582 | d = OPENSSL_malloc(sizeof *d); |
583 | if (d == NULL) | |
584 | return 0; | |
ba729265 | 585 | |
0f113f3e MC |
586 | d->data = data; |
587 | d->dup_func = dup_func; | |
588 | d->free_func = free_func; | |
589 | d->clear_free_func = clear_free_func; | |
ba729265 | 590 | |
0f113f3e MC |
591 | d->next = *ex_data; |
592 | *ex_data = d; | |
ba729265 | 593 | |
0f113f3e MC |
594 | return 1; |
595 | } | |
df9cc153 | 596 | |
df9cc153 | 597 | /* this has 'package' visibility */ |
9dd84053 | 598 | void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data, |
0f113f3e MC |
599 | void *(*dup_func) (void *), |
600 | void (*free_func) (void *), | |
601 | void (*clear_free_func) (void *)) | |
602 | { | |
603 | const EC_EXTRA_DATA *d; | |
604 | ||
605 | for (d = ex_data; d != NULL; d = d->next) { | |
606 | if (d->dup_func == dup_func && d->free_func == free_func | |
607 | && d->clear_free_func == clear_free_func) | |
608 | return d->data; | |
609 | } | |
610 | ||
611 | return NULL; | |
612 | } | |
df9cc153 | 613 | |
ba729265 | 614 | /* this has 'package' visibility */ |
9dd84053 | 615 | void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data, |
0f113f3e MC |
616 | void *(*dup_func) (void *), |
617 | void (*free_func) (void *), | |
618 | void (*clear_free_func) (void *)) | |
619 | { | |
620 | EC_EXTRA_DATA **p; | |
621 | ||
622 | if (ex_data == NULL) | |
623 | return; | |
624 | ||
625 | for (p = ex_data; *p != NULL; p = &((*p)->next)) { | |
626 | if ((*p)->dup_func == dup_func && (*p)->free_func == free_func | |
627 | && (*p)->clear_free_func == clear_free_func) { | |
628 | EC_EXTRA_DATA *next = (*p)->next; | |
629 | ||
630 | (*p)->free_func((*p)->data); | |
631 | OPENSSL_free(*p); | |
632 | ||
633 | *p = next; | |
634 | return; | |
635 | } | |
636 | } | |
637 | } | |
df9cc153 | 638 | |
ba729265 | 639 | /* this has 'package' visibility */ |
bbbd6710 | 640 | void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data, |
0f113f3e MC |
641 | void *(*dup_func) (void *), |
642 | void (*free_func) (void *), | |
643 | void (*clear_free_func) (void *)) | |
644 | { | |
645 | EC_EXTRA_DATA **p; | |
646 | ||
647 | if (ex_data == NULL) | |
648 | return; | |
649 | ||
650 | for (p = ex_data; *p != NULL; p = &((*p)->next)) { | |
651 | if ((*p)->dup_func == dup_func && (*p)->free_func == free_func | |
652 | && (*p)->clear_free_func == clear_free_func) { | |
653 | EC_EXTRA_DATA *next = (*p)->next; | |
654 | ||
655 | (*p)->clear_free_func((*p)->data); | |
656 | OPENSSL_free(*p); | |
657 | ||
658 | *p = next; | |
659 | return; | |
660 | } | |
661 | } | |
662 | } | |
df9cc153 BM |
663 | |
664 | /* this has 'package' visibility */ | |
9dd84053 | 665 | void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data) |
0f113f3e MC |
666 | { |
667 | EC_EXTRA_DATA *d; | |
668 | ||
669 | if (ex_data == NULL) | |
670 | return; | |
671 | ||
672 | d = *ex_data; | |
673 | while (d) { | |
674 | EC_EXTRA_DATA *next = d->next; | |
675 | ||
676 | d->free_func(d->data); | |
677 | OPENSSL_free(d); | |
678 | ||
679 | d = next; | |
680 | } | |
681 | *ex_data = NULL; | |
682 | } | |
df9cc153 | 683 | |
df9cc153 | 684 | /* this has 'package' visibility */ |
9dd84053 | 685 | void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data) |
0f113f3e MC |
686 | { |
687 | EC_EXTRA_DATA *d; | |
688 | ||
689 | if (ex_data == NULL) | |
690 | return; | |
691 | ||
692 | d = *ex_data; | |
693 | while (d) { | |
694 | EC_EXTRA_DATA *next = d->next; | |
695 | ||
696 | d->clear_free_func(d->data); | |
697 | OPENSSL_free(d); | |
df9cc153 | 698 | |
0f113f3e MC |
699 | d = next; |
700 | } | |
701 | *ex_data = NULL; | |
702 | } | |
0657bf9c BM |
703 | |
704 | /* functions for EC_POINT objects */ | |
705 | ||
706 | EC_POINT *EC_POINT_new(const EC_GROUP *group) | |
0f113f3e MC |
707 | { |
708 | EC_POINT *ret; | |
709 | ||
710 | if (group == NULL) { | |
711 | ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER); | |
712 | return NULL; | |
713 | } | |
714 | if (group->meth->point_init == 0) { | |
715 | ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
716 | return NULL; | |
717 | } | |
718 | ||
719 | ret = OPENSSL_malloc(sizeof *ret); | |
720 | if (ret == NULL) { | |
721 | ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE); | |
722 | return NULL; | |
723 | } | |
724 | ||
725 | ret->meth = group->meth; | |
726 | ||
727 | if (!ret->meth->point_init(ret)) { | |
728 | OPENSSL_free(ret); | |
729 | return NULL; | |
730 | } | |
731 | ||
732 | return ret; | |
733 | } | |
0657bf9c BM |
734 | |
735 | void EC_POINT_free(EC_POINT *point) | |
0f113f3e MC |
736 | { |
737 | if (!point) | |
738 | return; | |
7711de24 | 739 | |
0f113f3e MC |
740 | if (point->meth->point_finish != 0) |
741 | point->meth->point_finish(point); | |
742 | OPENSSL_free(point); | |
743 | } | |
0657bf9c BM |
744 | |
745 | void EC_POINT_clear_free(EC_POINT *point) | |
0f113f3e MC |
746 | { |
747 | if (!point) | |
748 | return; | |
749 | ||
750 | if (point->meth->point_clear_finish != 0) | |
751 | point->meth->point_clear_finish(point); | |
752 | else if (point->meth->point_finish != 0) | |
753 | point->meth->point_finish(point); | |
754 | OPENSSL_cleanse(point, sizeof *point); | |
755 | OPENSSL_free(point); | |
756 | } | |
0657bf9c BM |
757 | |
758 | int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src) | |
0f113f3e MC |
759 | { |
760 | if (dest->meth->point_copy == 0) { | |
761 | ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
762 | return 0; | |
763 | } | |
764 | if (dest->meth != src->meth) { | |
765 | ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS); | |
766 | return 0; | |
767 | } | |
768 | if (dest == src) | |
769 | return 1; | |
770 | return dest->meth->point_copy(dest, src); | |
771 | } | |
0657bf9c | 772 | |
7793f30e | 773 | EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group) |
0f113f3e MC |
774 | { |
775 | EC_POINT *t; | |
776 | int r; | |
777 | ||
778 | if (a == NULL) | |
779 | return NULL; | |
780 | ||
781 | t = EC_POINT_new(group); | |
782 | if (t == NULL) | |
783 | return (NULL); | |
784 | r = EC_POINT_copy(t, a); | |
785 | if (!r) { | |
786 | EC_POINT_free(t); | |
787 | return NULL; | |
8fdc3734 RS |
788 | } |
789 | return t; | |
0f113f3e | 790 | } |
7793f30e | 791 | |
48fe4d62 | 792 | const EC_METHOD *EC_POINT_method_of(const EC_POINT *point) |
0f113f3e MC |
793 | { |
794 | return point->meth; | |
795 | } | |
48fe4d62 | 796 | |
226cc7de | 797 | int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point) |
0f113f3e MC |
798 | { |
799 | if (group->meth->point_set_to_infinity == 0) { | |
800 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, | |
801 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
802 | return 0; | |
803 | } | |
804 | if (group->meth != point->meth) { | |
805 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); | |
806 | return 0; | |
807 | } | |
808 | return group->meth->point_set_to_infinity(group, point); | |
809 | } | |
810 | ||
811 | int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
812 | EC_POINT *point, const BIGNUM *x, | |
813 | const BIGNUM *y, const BIGNUM *z, | |
814 | BN_CTX *ctx) | |
815 | { | |
816 | if (group->meth->point_set_Jprojective_coordinates_GFp == 0) { | |
817 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, | |
818 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
819 | return 0; | |
820 | } | |
821 | if (group->meth != point->meth) { | |
822 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, | |
823 | EC_R_INCOMPATIBLE_OBJECTS); | |
824 | return 0; | |
825 | } | |
826 | return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, | |
827 | y, z, ctx); | |
828 | } | |
829 | ||
830 | int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
831 | const EC_POINT *point, BIGNUM *x, | |
832 | BIGNUM *y, BIGNUM *z, | |
833 | BN_CTX *ctx) | |
834 | { | |
835 | if (group->meth->point_get_Jprojective_coordinates_GFp == 0) { | |
836 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, | |
837 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
838 | return 0; | |
839 | } | |
840 | if (group->meth != point->meth) { | |
841 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, | |
842 | EC_R_INCOMPATIBLE_OBJECTS); | |
843 | return 0; | |
844 | } | |
845 | return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, | |
846 | y, z, ctx); | |
847 | } | |
848 | ||
849 | int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, | |
850 | EC_POINT *point, const BIGNUM *x, | |
851 | const BIGNUM *y, BN_CTX *ctx) | |
852 | { | |
853 | if (group->meth->point_set_affine_coordinates == 0) { | |
854 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, | |
855 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
856 | return 0; | |
857 | } | |
858 | if (group->meth != point->meth) { | |
859 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, | |
860 | EC_R_INCOMPATIBLE_OBJECTS); | |
861 | return 0; | |
862 | } | |
863 | return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); | |
864 | } | |
226cc7de | 865 | |
b3310161 | 866 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
867 | int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, |
868 | EC_POINT *point, const BIGNUM *x, | |
869 | const BIGNUM *y, BN_CTX *ctx) | |
870 | { | |
871 | if (group->meth->point_set_affine_coordinates == 0) { | |
872 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, | |
873 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
874 | return 0; | |
875 | } | |
876 | if (group->meth != point->meth) { | |
877 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, | |
878 | EC_R_INCOMPATIBLE_OBJECTS); | |
879 | return 0; | |
880 | } | |
881 | return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); | |
882 | } | |
b3310161 | 883 | #endif |
7793f30e | 884 | |
0f113f3e MC |
885 | int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, |
886 | const EC_POINT *point, BIGNUM *x, | |
887 | BIGNUM *y, BN_CTX *ctx) | |
888 | { | |
889 | if (group->meth->point_get_affine_coordinates == 0) { | |
890 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, | |
891 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
892 | return 0; | |
893 | } | |
894 | if (group->meth != point->meth) { | |
895 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, | |
896 | EC_R_INCOMPATIBLE_OBJECTS); | |
897 | return 0; | |
898 | } | |
899 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); | |
900 | } | |
7793f30e | 901 | |
b3310161 | 902 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
903 | int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, |
904 | const EC_POINT *point, BIGNUM *x, | |
905 | BIGNUM *y, BN_CTX *ctx) | |
906 | { | |
907 | if (group->meth->point_get_affine_coordinates == 0) { | |
908 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, | |
909 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
910 | return 0; | |
911 | } | |
912 | if (group->meth != point->meth) { | |
913 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, | |
914 | EC_R_INCOMPATIBLE_OBJECTS); | |
915 | return 0; | |
916 | } | |
917 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); | |
918 | } | |
b3310161 | 919 | #endif |
7793f30e | 920 | |
0f113f3e MC |
921 | int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, |
922 | const EC_POINT *b, BN_CTX *ctx) | |
923 | { | |
924 | if (group->meth->add == 0) { | |
925 | ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
926 | return 0; | |
927 | } | |
928 | if ((group->meth != r->meth) || (r->meth != a->meth) | |
929 | || (a->meth != b->meth)) { | |
930 | ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS); | |
931 | return 0; | |
932 | } | |
933 | return group->meth->add(group, r, a, b, ctx); | |
934 | } | |
935 | ||
936 | int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, | |
937 | BN_CTX *ctx) | |
938 | { | |
939 | if (group->meth->dbl == 0) { | |
940 | ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
941 | return 0; | |
942 | } | |
943 | if ((group->meth != r->meth) || (r->meth != a->meth)) { | |
944 | ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS); | |
945 | return 0; | |
946 | } | |
947 | return group->meth->dbl(group, r, a, ctx); | |
948 | } | |
0657bf9c | 949 | |
1d5bd6cf | 950 | int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) |
0f113f3e MC |
951 | { |
952 | if (group->meth->invert == 0) { | |
953 | ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
954 | return 0; | |
955 | } | |
956 | if (group->meth != a->meth) { | |
957 | ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS); | |
958 | return 0; | |
959 | } | |
960 | return group->meth->invert(group, a, ctx); | |
961 | } | |
1d5bd6cf | 962 | |
0657bf9c | 963 | int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) |
0f113f3e MC |
964 | { |
965 | if (group->meth->is_at_infinity == 0) { | |
966 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, | |
967 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
968 | return 0; | |
969 | } | |
970 | if (group->meth != point->meth) { | |
971 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); | |
972 | return 0; | |
973 | } | |
974 | return group->meth->is_at_infinity(group, point); | |
975 | } | |
976 | ||
977 | int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, | |
978 | BN_CTX *ctx) | |
979 | { | |
980 | if (group->meth->is_on_curve == 0) { | |
981 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
982 | return 0; | |
983 | } | |
984 | if (group->meth != point->meth) { | |
985 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS); | |
986 | return 0; | |
987 | } | |
988 | return group->meth->is_on_curve(group, point, ctx); | |
989 | } | |
990 | ||
991 | int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, | |
992 | BN_CTX *ctx) | |
993 | { | |
994 | if (group->meth->point_cmp == 0) { | |
995 | ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
996 | return -1; | |
997 | } | |
998 | if ((group->meth != a->meth) || (a->meth != b->meth)) { | |
999 | ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS); | |
1000 | return -1; | |
1001 | } | |
1002 | return group->meth->point_cmp(group, a, b, ctx); | |
1003 | } | |
1d5bd6cf | 1004 | |
e869d4bd | 1005 | int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) |
0f113f3e MC |
1006 | { |
1007 | if (group->meth->make_affine == 0) { | |
1008 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
1009 | return 0; | |
1010 | } | |
1011 | if (group->meth != point->meth) { | |
1012 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); | |
1013 | return 0; | |
1014 | } | |
1015 | return group->meth->make_affine(group, point, ctx); | |
1016 | } | |
1017 | ||
1018 | int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, | |
1019 | EC_POINT *points[], BN_CTX *ctx) | |
1020 | { | |
1021 | size_t i; | |
1022 | ||
1023 | if (group->meth->points_make_affine == 0) { | |
1024 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
1025 | return 0; | |
1026 | } | |
1027 | for (i = 0; i < num; i++) { | |
1028 | if (group->meth != points[i]->meth) { | |
1029 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); | |
1030 | return 0; | |
1031 | } | |
1032 | } | |
1033 | return group->meth->points_make_affine(group, num, points, ctx); | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Functions for point multiplication. If group->meth->mul is 0, we use the | |
1038 | * wNAF-based implementations in ec_mult.c; otherwise we dispatch through | |
1039 | * methods. | |
37c660ff BM |
1040 | */ |
1041 | ||
1042 | int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, | |
0f113f3e MC |
1043 | size_t num, const EC_POINT *points[], |
1044 | const BIGNUM *scalars[], BN_CTX *ctx) | |
1045 | { | |
1046 | if (group->meth->mul == 0) | |
1047 | /* use default */ | |
1048 | return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); | |
37c660ff | 1049 | |
0f113f3e MC |
1050 | return group->meth->mul(group, r, scalar, num, points, scalars, ctx); |
1051 | } | |
37c660ff BM |
1052 | |
1053 | int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, | |
0f113f3e MC |
1054 | const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) |
1055 | { | |
1056 | /* just a convenient interface to EC_POINTs_mul() */ | |
37c660ff | 1057 | |
0f113f3e MC |
1058 | const EC_POINT *points[1]; |
1059 | const BIGNUM *scalars[1]; | |
37c660ff | 1060 | |
0f113f3e MC |
1061 | points[0] = point; |
1062 | scalars[0] = p_scalar; | |
37c660ff | 1063 | |
0f113f3e MC |
1064 | return EC_POINTs_mul(group, r, g_scalar, |
1065 | (point != NULL | |
1066 | && p_scalar != NULL), points, scalars, ctx); | |
1067 | } | |
37c660ff BM |
1068 | |
1069 | int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx) | |
0f113f3e MC |
1070 | { |
1071 | if (group->meth->mul == 0) | |
1072 | /* use default */ | |
1073 | return ec_wNAF_precompute_mult(group, ctx); | |
37c660ff | 1074 | |
0f113f3e MC |
1075 | if (group->meth->precompute_mult != 0) |
1076 | return group->meth->precompute_mult(group, ctx); | |
1077 | else | |
1078 | return 1; /* nothing to do, so report success */ | |
1079 | } | |
37c660ff BM |
1080 | |
1081 | int EC_GROUP_have_precompute_mult(const EC_GROUP *group) | |
0f113f3e MC |
1082 | { |
1083 | if (group->meth->mul == 0) | |
1084 | /* use default */ | |
1085 | return ec_wNAF_have_precompute_mult(group); | |
1086 | ||
1087 | if (group->meth->have_precompute_mult != 0) | |
1088 | return group->meth->have_precompute_mult(group); | |
1089 | else | |
1090 | return 0; /* cannot tell whether precomputation has | |
1091 | * been performed */ | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * ec_precompute_mont_data sets |group->mont_data| from |group->order| and | |
1096 | * returns one on success. On error it returns zero. | |
1097 | */ | |
f54be179 | 1098 | int ec_precompute_mont_data(EC_GROUP *group) |
0f113f3e MC |
1099 | { |
1100 | BN_CTX *ctx = BN_CTX_new(); | |
1101 | int ret = 0; | |
1102 | ||
1103 | if (group->mont_data) { | |
1104 | BN_MONT_CTX_free(group->mont_data); | |
1105 | group->mont_data = NULL; | |
1106 | } | |
1107 | ||
1108 | if (ctx == NULL) | |
1109 | goto err; | |
1110 | ||
1111 | group->mont_data = BN_MONT_CTX_new(); | |
1112 | if (!group->mont_data) | |
1113 | goto err; | |
1114 | ||
1115 | if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) { | |
1116 | BN_MONT_CTX_free(group->mont_data); | |
1117 | group->mont_data = NULL; | |
1118 | goto err; | |
1119 | } | |
1120 | ||
1121 | ret = 1; | |
1122 | ||
1123 | err: | |
1124 | ||
1125 | if (ctx) | |
1126 | BN_CTX_free(ctx); | |
1127 | return ret; | |
1128 | } |