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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 | |
0657bf9c BM |
71 | /* functions for EC_GROUP objects */ |
72 | ||
73 | EC_GROUP *EC_GROUP_new(const EC_METHOD *meth) | |
0f113f3e MC |
74 | { |
75 | EC_GROUP *ret; | |
76 | ||
77 | if (meth == NULL) { | |
78 | ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL); | |
79 | return NULL; | |
80 | } | |
81 | if (meth->group_init == 0) { | |
82 | ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
83 | return NULL; | |
84 | } | |
85 | ||
b4faea50 | 86 | ret = OPENSSL_malloc(sizeof(*ret)); |
0f113f3e MC |
87 | if (ret == NULL) { |
88 | ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE); | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | ret->meth = meth; | |
93 | ||
94 | ret->extra_data = NULL; | |
95 | ret->mont_data = NULL; | |
96 | ||
97 | ret->generator = NULL; | |
98 | ret->order = BN_new(); | |
99 | ret->cofactor = NULL; | |
100 | if (!ret->order) | |
101 | goto err; | |
102 | ret->cofactor = BN_new(); | |
103 | if (!ret->cofactor) | |
104 | goto err; | |
105 | ||
106 | ret->curve_name = 0; | |
86f300d3 | 107 | ret->asn1_flag = OPENSSL_EC_NAMED_CURVE; |
0f113f3e MC |
108 | ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; |
109 | ||
110 | ret->seed = NULL; | |
111 | ret->seed_len = 0; | |
112 | ||
113 | if (!meth->group_init(ret)) | |
114 | goto err; | |
115 | ||
116 | return ret; | |
117 | err: | |
23a1d5e9 RS |
118 | BN_free(ret->order); |
119 | BN_free(ret->cofactor); | |
0f113f3e MC |
120 | OPENSSL_free(ret); |
121 | return NULL; | |
122 | } | |
0657bf9c | 123 | |
0657bf9c | 124 | void EC_GROUP_free(EC_GROUP *group) |
0f113f3e MC |
125 | { |
126 | if (!group) | |
127 | return; | |
7711de24 | 128 | |
0f113f3e MC |
129 | if (group->meth->group_finish != 0) |
130 | group->meth->group_finish(group); | |
df9cc153 | 131 | |
0f113f3e | 132 | EC_EX_DATA_free_all_data(&group->extra_data); |
23a1d5e9 | 133 | BN_MONT_CTX_free(group->mont_data); |
8fdc3734 | 134 | EC_POINT_free(group->generator); |
0f113f3e MC |
135 | BN_free(group->order); |
136 | BN_free(group->cofactor); | |
25aaa98a | 137 | OPENSSL_free(group->seed); |
0f113f3e MC |
138 | OPENSSL_free(group); |
139 | } | |
0657bf9c BM |
140 | |
141 | void EC_GROUP_clear_free(EC_GROUP *group) | |
0f113f3e MC |
142 | { |
143 | if (!group) | |
144 | return; | |
df9cc153 | 145 | |
0f113f3e MC |
146 | if (group->meth->group_clear_finish != 0) |
147 | group->meth->group_clear_finish(group); | |
148 | else if (group->meth->group_finish != 0) | |
149 | group->meth->group_finish(group); | |
df9cc153 | 150 | |
0f113f3e | 151 | EC_EX_DATA_clear_free_all_data(&group->extra_data); |
f54be179 | 152 | |
23a1d5e9 | 153 | BN_MONT_CTX_free(group->mont_data); |
b6db386f | 154 | |
8fdc3734 | 155 | EC_POINT_clear_free(group->generator); |
0f113f3e MC |
156 | BN_clear_free(group->order); |
157 | BN_clear_free(group->cofactor); | |
4b45c6e5 | 158 | OPENSSL_clear_free(group->seed, group->seed_len); |
b4faea50 | 159 | OPENSSL_clear_free(group, sizeof(*group)); |
0f113f3e | 160 | } |
0657bf9c BM |
161 | |
162 | int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src) | |
0f113f3e MC |
163 | { |
164 | EC_EXTRA_DATA *d; | |
165 | ||
166 | if (dest->meth->group_copy == 0) { | |
167 | ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
168 | return 0; | |
169 | } | |
170 | if (dest->meth != src->meth) { | |
171 | ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS); | |
172 | return 0; | |
173 | } | |
174 | if (dest == src) | |
175 | return 1; | |
176 | ||
177 | EC_EX_DATA_free_all_data(&dest->extra_data); | |
178 | ||
179 | for (d = src->extra_data; d != NULL; d = d->next) { | |
180 | void *t = d->dup_func(d->data); | |
181 | ||
182 | if (t == NULL) | |
183 | return 0; | |
184 | if (!EC_EX_DATA_set_data | |
185 | (&dest->extra_data, t, d->dup_func, d->free_func, | |
186 | d->clear_free_func)) | |
187 | return 0; | |
188 | } | |
189 | ||
190 | if (src->mont_data != NULL) { | |
191 | if (dest->mont_data == NULL) { | |
192 | dest->mont_data = BN_MONT_CTX_new(); | |
193 | if (dest->mont_data == NULL) | |
194 | return 0; | |
195 | } | |
196 | if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data)) | |
197 | return 0; | |
198 | } else { | |
199 | /* src->generator == NULL */ | |
23a1d5e9 RS |
200 | BN_MONT_CTX_free(dest->mont_data); |
201 | dest->mont_data = NULL; | |
0f113f3e | 202 | } |
0657bf9c | 203 | |
0f113f3e MC |
204 | if (src->generator != NULL) { |
205 | if (dest->generator == NULL) { | |
206 | dest->generator = EC_POINT_new(dest); | |
207 | if (dest->generator == NULL) | |
208 | return 0; | |
209 | } | |
210 | if (!EC_POINT_copy(dest->generator, src->generator)) | |
211 | return 0; | |
212 | } else { | |
213 | /* src->generator == NULL */ | |
8fdc3734 RS |
214 | EC_POINT_clear_free(dest->generator); |
215 | dest->generator = NULL; | |
0f113f3e MC |
216 | } |
217 | ||
218 | if (!BN_copy(dest->order, src->order)) | |
219 | return 0; | |
220 | if (!BN_copy(dest->cofactor, src->cofactor)) | |
221 | return 0; | |
222 | ||
223 | dest->curve_name = src->curve_name; | |
224 | dest->asn1_flag = src->asn1_flag; | |
225 | dest->asn1_form = src->asn1_form; | |
226 | ||
227 | if (src->seed) { | |
b548a1f1 | 228 | OPENSSL_free(dest->seed); |
0f113f3e MC |
229 | dest->seed = OPENSSL_malloc(src->seed_len); |
230 | if (dest->seed == NULL) | |
231 | return 0; | |
232 | if (!memcpy(dest->seed, src->seed, src->seed_len)) | |
233 | return 0; | |
234 | dest->seed_len = src->seed_len; | |
235 | } else { | |
b548a1f1 | 236 | OPENSSL_free(dest->seed); |
0f113f3e MC |
237 | dest->seed = NULL; |
238 | dest->seed_len = 0; | |
239 | } | |
240 | ||
241 | return dest->meth->group_copy(dest, src); | |
242 | } | |
0657bf9c | 243 | |
7793f30e | 244 | EC_GROUP *EC_GROUP_dup(const EC_GROUP *a) |
0f113f3e MC |
245 | { |
246 | EC_GROUP *t = NULL; | |
247 | int ok = 0; | |
7793f30e | 248 | |
0f113f3e MC |
249 | if (a == NULL) |
250 | return NULL; | |
7793f30e | 251 | |
0f113f3e MC |
252 | if ((t = EC_GROUP_new(a->meth)) == NULL) |
253 | return (NULL); | |
254 | if (!EC_GROUP_copy(t, a)) | |
255 | goto err; | |
7793f30e | 256 | |
0f113f3e | 257 | ok = 1; |
7793f30e | 258 | |
0f113f3e MC |
259 | err: |
260 | if (!ok) { | |
8fdc3734 | 261 | EC_GROUP_free(t); |
0f113f3e | 262 | return NULL; |
8fdc3734 | 263 | } |
0f113f3e MC |
264 | return t; |
265 | } | |
7793f30e | 266 | |
48fe4d62 | 267 | const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group) |
0f113f3e MC |
268 | { |
269 | return group->meth; | |
270 | } | |
48fe4d62 | 271 | |
458c2917 | 272 | int EC_METHOD_get_field_type(const EC_METHOD *meth) |
0f113f3e MC |
273 | { |
274 | return meth->field_type; | |
275 | } | |
276 | ||
277 | int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, | |
278 | const BIGNUM *order, const BIGNUM *cofactor) | |
279 | { | |
280 | if (generator == NULL) { | |
281 | ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | if (group->generator == NULL) { | |
286 | group->generator = EC_POINT_new(group); | |
287 | if (group->generator == NULL) | |
288 | return 0; | |
289 | } | |
290 | if (!EC_POINT_copy(group->generator, generator)) | |
291 | return 0; | |
292 | ||
293 | if (order != NULL) { | |
294 | if (!BN_copy(group->order, order)) | |
295 | return 0; | |
296 | } else | |
297 | BN_zero(group->order); | |
298 | ||
299 | if (cofactor != NULL) { | |
300 | if (!BN_copy(group->cofactor, cofactor)) | |
301 | return 0; | |
302 | } else | |
303 | BN_zero(group->cofactor); | |
304 | ||
305 | /* | |
306 | * We ignore the return value because some groups have an order with | |
307 | * factors of two, which makes the Montgomery setup fail. | |
308 | * |group->mont_data| will be NULL in this case. | |
309 | */ | |
310 | ec_precompute_mont_data(group); | |
311 | ||
312 | return 1; | |
313 | } | |
bb62a8b0 | 314 | |
9dd84053 | 315 | const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group) |
0f113f3e MC |
316 | { |
317 | return group->generator; | |
318 | } | |
bb62a8b0 | 319 | |
f54be179 | 320 | BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group) |
0f113f3e MC |
321 | { |
322 | return group->mont_data; | |
323 | } | |
bb62a8b0 | 324 | |
b6db386f | 325 | int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) |
0f113f3e MC |
326 | { |
327 | if (!BN_copy(order, group->order)) | |
328 | return 0; | |
0657bf9c | 329 | |
0f113f3e MC |
330 | return !BN_is_zero(order); |
331 | } | |
0657bf9c | 332 | |
0f113f3e MC |
333 | int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, |
334 | BN_CTX *ctx) | |
335 | { | |
336 | if (!BN_copy(cofactor, group->cofactor)) | |
337 | return 0; | |
48fe4d62 | 338 | |
0f113f3e MC |
339 | return !BN_is_zero(group->cofactor); |
340 | } | |
48fe4d62 | 341 | |
7dc17a6c | 342 | void EC_GROUP_set_curve_name(EC_GROUP *group, int nid) |
0f113f3e MC |
343 | { |
344 | group->curve_name = nid; | |
345 | } | |
b6db386f | 346 | |
7dc17a6c | 347 | int EC_GROUP_get_curve_name(const EC_GROUP *group) |
0f113f3e MC |
348 | { |
349 | return group->curve_name; | |
350 | } | |
b6db386f | 351 | |
458c2917 | 352 | void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag) |
0f113f3e MC |
353 | { |
354 | group->asn1_flag = flag; | |
355 | } | |
458c2917 BM |
356 | |
357 | int EC_GROUP_get_asn1_flag(const EC_GROUP *group) | |
0f113f3e MC |
358 | { |
359 | return group->asn1_flag; | |
360 | } | |
458c2917 | 361 | |
0f113f3e | 362 | void EC_GROUP_set_point_conversion_form(EC_GROUP *group, |
254ef80d | 363 | point_conversion_form_t form) |
0f113f3e MC |
364 | { |
365 | group->asn1_form = form; | |
366 | } | |
254ef80d | 367 | |
0f113f3e MC |
368 | point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP |
369 | *group) | |
370 | { | |
371 | return group->asn1_form; | |
372 | } | |
254ef80d | 373 | |
5f3d6f70 | 374 | size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len) |
0f113f3e | 375 | { |
b548a1f1 RS |
376 | OPENSSL_free(group->seed); |
377 | group->seed = NULL; | |
378 | group->seed_len = 0; | |
5f3d6f70 | 379 | |
0f113f3e MC |
380 | if (!len || !p) |
381 | return 1; | |
5f3d6f70 | 382 | |
0f113f3e MC |
383 | if ((group->seed = OPENSSL_malloc(len)) == NULL) |
384 | return 0; | |
385 | memcpy(group->seed, p, len); | |
386 | group->seed_len = len; | |
5f3d6f70 | 387 | |
0f113f3e MC |
388 | return len; |
389 | } | |
5f3d6f70 BM |
390 | |
391 | unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group) | |
0f113f3e MC |
392 | { |
393 | return group->seed; | |
394 | } | |
5f3d6f70 BM |
395 | |
396 | size_t EC_GROUP_get_seed_len(const EC_GROUP *group) | |
0f113f3e MC |
397 | { |
398 | return group->seed_len; | |
399 | } | |
400 | ||
401 | int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, | |
402 | const BIGNUM *b, BN_CTX *ctx) | |
403 | { | |
404 | if (group->meth->group_set_curve == 0) { | |
405 | ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
406 | return 0; | |
407 | } | |
408 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
409 | } | |
410 | ||
411 | int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
412 | BIGNUM *b, BN_CTX *ctx) | |
413 | { | |
414 | if (group->meth->group_get_curve == 0) { | |
415 | ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
416 | return 0; | |
417 | } | |
418 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
419 | } | |
7793f30e | 420 | |
b3310161 | 421 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
422 | int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
423 | const BIGNUM *b, BN_CTX *ctx) | |
424 | { | |
425 | if (group->meth->group_set_curve == 0) { | |
426 | ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, | |
427 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
428 | return 0; | |
429 | } | |
430 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
431 | } | |
432 | ||
433 | int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
434 | BIGNUM *b, BN_CTX *ctx) | |
435 | { | |
436 | if (group->meth->group_get_curve == 0) { | |
437 | ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, | |
438 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
439 | return 0; | |
440 | } | |
441 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
442 | } | |
b3310161 | 443 | #endif |
7793f30e BM |
444 | |
445 | int EC_GROUP_get_degree(const EC_GROUP *group) | |
0f113f3e MC |
446 | { |
447 | if (group->meth->group_get_degree == 0) { | |
448 | ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
449 | return 0; | |
450 | } | |
451 | return group->meth->group_get_degree(group); | |
452 | } | |
48fe4d62 | 453 | |
17d6bb81 | 454 | int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx) |
0f113f3e MC |
455 | { |
456 | if (group->meth->group_check_discriminant == 0) { | |
457 | ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, | |
458 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
459 | return 0; | |
460 | } | |
461 | return group->meth->group_check_discriminant(group, ctx); | |
462 | } | |
af28dd6c | 463 | |
ada0e717 | 464 | int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx) |
0f113f3e MC |
465 | { |
466 | int r = 0; | |
467 | BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; | |
468 | BN_CTX *ctx_new = NULL; | |
469 | ||
470 | /* compare the field types */ | |
471 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) != | |
472 | EC_METHOD_get_field_type(EC_GROUP_method_of(b))) | |
473 | return 1; | |
474 | /* compare the curve name (if present in both) */ | |
475 | if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && | |
476 | EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) | |
477 | return 1; | |
478 | ||
479 | if (!ctx) | |
480 | ctx_new = ctx = BN_CTX_new(); | |
481 | if (!ctx) | |
482 | return -1; | |
483 | ||
484 | BN_CTX_start(ctx); | |
485 | a1 = BN_CTX_get(ctx); | |
486 | a2 = BN_CTX_get(ctx); | |
487 | a3 = BN_CTX_get(ctx); | |
488 | b1 = BN_CTX_get(ctx); | |
489 | b2 = BN_CTX_get(ctx); | |
490 | b3 = BN_CTX_get(ctx); | |
491 | if (!b3) { | |
492 | BN_CTX_end(ctx); | |
23a1d5e9 | 493 | BN_CTX_free(ctx_new); |
0f113f3e MC |
494 | return -1; |
495 | } | |
496 | ||
497 | /* | |
498 | * XXX This approach assumes that the external representation of curves | |
499 | * over the same field type is the same. | |
500 | */ | |
501 | if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || | |
502 | !b->meth->group_get_curve(b, b1, b2, b3, ctx)) | |
503 | r = 1; | |
504 | ||
505 | if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3)) | |
506 | r = 1; | |
507 | ||
508 | /* XXX EC_POINT_cmp() assumes that the methods are equal */ | |
509 | if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), | |
510 | EC_GROUP_get0_generator(b), ctx)) | |
511 | r = 1; | |
512 | ||
513 | if (!r) { | |
514 | /* compare the order and cofactor */ | |
515 | if (!EC_GROUP_get_order(a, a1, ctx) || | |
516 | !EC_GROUP_get_order(b, b1, ctx) || | |
517 | !EC_GROUP_get_cofactor(a, a2, ctx) || | |
518 | !EC_GROUP_get_cofactor(b, b2, ctx)) { | |
519 | BN_CTX_end(ctx); | |
23a1d5e9 | 520 | BN_CTX_free(ctx_new); |
0f113f3e MC |
521 | return -1; |
522 | } | |
523 | if (BN_cmp(a1, b1) || BN_cmp(a2, b2)) | |
524 | r = 1; | |
525 | } | |
526 | ||
527 | BN_CTX_end(ctx); | |
23a1d5e9 | 528 | BN_CTX_free(ctx_new); |
ada0e717 | 529 | |
0f113f3e MC |
530 | return r; |
531 | } | |
ada0e717 | 532 | |
df9cc153 | 533 | /* this has 'package' visibility */ |
9dd84053 | 534 | int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data, |
0f113f3e MC |
535 | void *(*dup_func) (void *), |
536 | void (*free_func) (void *), | |
537 | void (*clear_free_func) (void *)) | |
538 | { | |
539 | EC_EXTRA_DATA *d; | |
540 | ||
541 | if (ex_data == NULL) | |
542 | return 0; | |
543 | ||
544 | for (d = *ex_data; d != NULL; d = d->next) { | |
545 | if (d->dup_func == dup_func && d->free_func == free_func | |
546 | && d->clear_free_func == clear_free_func) { | |
547 | ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL); | |
548 | return 0; | |
549 | } | |
550 | } | |
df9cc153 | 551 | |
0f113f3e MC |
552 | if (data == NULL) |
553 | /* no explicit entry needed */ | |
554 | return 1; | |
ba729265 | 555 | |
b4faea50 | 556 | d = OPENSSL_malloc(sizeof(*d)); |
0f113f3e MC |
557 | if (d == NULL) |
558 | return 0; | |
ba729265 | 559 | |
0f113f3e MC |
560 | d->data = data; |
561 | d->dup_func = dup_func; | |
562 | d->free_func = free_func; | |
563 | d->clear_free_func = clear_free_func; | |
ba729265 | 564 | |
0f113f3e MC |
565 | d->next = *ex_data; |
566 | *ex_data = d; | |
ba729265 | 567 | |
0f113f3e MC |
568 | return 1; |
569 | } | |
df9cc153 | 570 | |
df9cc153 | 571 | /* this has 'package' visibility */ |
9dd84053 | 572 | void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data, |
0f113f3e MC |
573 | void *(*dup_func) (void *), |
574 | void (*free_func) (void *), | |
575 | void (*clear_free_func) (void *)) | |
576 | { | |
577 | const EC_EXTRA_DATA *d; | |
578 | ||
579 | for (d = ex_data; d != NULL; d = d->next) { | |
580 | if (d->dup_func == dup_func && d->free_func == free_func | |
581 | && d->clear_free_func == clear_free_func) | |
582 | return d->data; | |
583 | } | |
584 | ||
585 | return NULL; | |
586 | } | |
df9cc153 | 587 | |
ba729265 | 588 | /* this has 'package' visibility */ |
9dd84053 | 589 | void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data, |
0f113f3e MC |
590 | void *(*dup_func) (void *), |
591 | void (*free_func) (void *), | |
592 | void (*clear_free_func) (void *)) | |
593 | { | |
594 | EC_EXTRA_DATA **p; | |
595 | ||
596 | if (ex_data == NULL) | |
597 | return; | |
598 | ||
599 | for (p = ex_data; *p != NULL; p = &((*p)->next)) { | |
600 | if ((*p)->dup_func == dup_func && (*p)->free_func == free_func | |
601 | && (*p)->clear_free_func == clear_free_func) { | |
602 | EC_EXTRA_DATA *next = (*p)->next; | |
603 | ||
604 | (*p)->free_func((*p)->data); | |
605 | OPENSSL_free(*p); | |
606 | ||
607 | *p = next; | |
608 | return; | |
609 | } | |
610 | } | |
611 | } | |
df9cc153 | 612 | |
ba729265 | 613 | /* this has 'package' visibility */ |
bbbd6710 | 614 | void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data, |
0f113f3e MC |
615 | void *(*dup_func) (void *), |
616 | void (*free_func) (void *), | |
617 | void (*clear_free_func) (void *)) | |
618 | { | |
619 | EC_EXTRA_DATA **p; | |
620 | ||
621 | if (ex_data == NULL) | |
622 | return; | |
623 | ||
624 | for (p = ex_data; *p != NULL; p = &((*p)->next)) { | |
625 | if ((*p)->dup_func == dup_func && (*p)->free_func == free_func | |
626 | && (*p)->clear_free_func == clear_free_func) { | |
627 | EC_EXTRA_DATA *next = (*p)->next; | |
628 | ||
629 | (*p)->clear_free_func((*p)->data); | |
630 | OPENSSL_free(*p); | |
631 | ||
632 | *p = next; | |
633 | return; | |
634 | } | |
635 | } | |
636 | } | |
df9cc153 BM |
637 | |
638 | /* this has 'package' visibility */ | |
9dd84053 | 639 | void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data) |
0f113f3e MC |
640 | { |
641 | EC_EXTRA_DATA *d; | |
642 | ||
643 | if (ex_data == NULL) | |
644 | return; | |
645 | ||
646 | d = *ex_data; | |
647 | while (d) { | |
648 | EC_EXTRA_DATA *next = d->next; | |
649 | ||
650 | d->free_func(d->data); | |
651 | OPENSSL_free(d); | |
652 | ||
653 | d = next; | |
654 | } | |
655 | *ex_data = NULL; | |
656 | } | |
df9cc153 | 657 | |
df9cc153 | 658 | /* this has 'package' visibility */ |
9dd84053 | 659 | void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data) |
0f113f3e MC |
660 | { |
661 | EC_EXTRA_DATA *d; | |
662 | ||
663 | if (ex_data == NULL) | |
664 | return; | |
665 | ||
666 | d = *ex_data; | |
667 | while (d) { | |
668 | EC_EXTRA_DATA *next = d->next; | |
669 | ||
670 | d->clear_free_func(d->data); | |
671 | OPENSSL_free(d); | |
df9cc153 | 672 | |
0f113f3e MC |
673 | d = next; |
674 | } | |
675 | *ex_data = NULL; | |
676 | } | |
0657bf9c BM |
677 | |
678 | /* functions for EC_POINT objects */ | |
679 | ||
680 | EC_POINT *EC_POINT_new(const EC_GROUP *group) | |
0f113f3e MC |
681 | { |
682 | EC_POINT *ret; | |
683 | ||
684 | if (group == NULL) { | |
685 | ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER); | |
686 | return NULL; | |
687 | } | |
688 | if (group->meth->point_init == 0) { | |
689 | ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
690 | return NULL; | |
691 | } | |
692 | ||
b4faea50 | 693 | ret = OPENSSL_malloc(sizeof(*ret)); |
0f113f3e MC |
694 | if (ret == NULL) { |
695 | ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE); | |
696 | return NULL; | |
697 | } | |
698 | ||
699 | ret->meth = group->meth; | |
700 | ||
701 | if (!ret->meth->point_init(ret)) { | |
702 | OPENSSL_free(ret); | |
703 | return NULL; | |
704 | } | |
705 | ||
706 | return ret; | |
707 | } | |
0657bf9c BM |
708 | |
709 | void EC_POINT_free(EC_POINT *point) | |
0f113f3e MC |
710 | { |
711 | if (!point) | |
712 | return; | |
7711de24 | 713 | |
0f113f3e MC |
714 | if (point->meth->point_finish != 0) |
715 | point->meth->point_finish(point); | |
716 | OPENSSL_free(point); | |
717 | } | |
0657bf9c BM |
718 | |
719 | void EC_POINT_clear_free(EC_POINT *point) | |
0f113f3e MC |
720 | { |
721 | if (!point) | |
722 | return; | |
723 | ||
724 | if (point->meth->point_clear_finish != 0) | |
725 | point->meth->point_clear_finish(point); | |
726 | else if (point->meth->point_finish != 0) | |
727 | point->meth->point_finish(point); | |
b4faea50 | 728 | OPENSSL_clear_free(point, sizeof(*point)); |
0f113f3e | 729 | } |
0657bf9c BM |
730 | |
731 | int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src) | |
0f113f3e MC |
732 | { |
733 | if (dest->meth->point_copy == 0) { | |
734 | ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
735 | return 0; | |
736 | } | |
737 | if (dest->meth != src->meth) { | |
738 | ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS); | |
739 | return 0; | |
740 | } | |
741 | if (dest == src) | |
742 | return 1; | |
743 | return dest->meth->point_copy(dest, src); | |
744 | } | |
0657bf9c | 745 | |
7793f30e | 746 | EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group) |
0f113f3e MC |
747 | { |
748 | EC_POINT *t; | |
749 | int r; | |
750 | ||
751 | if (a == NULL) | |
752 | return NULL; | |
753 | ||
754 | t = EC_POINT_new(group); | |
755 | if (t == NULL) | |
756 | return (NULL); | |
757 | r = EC_POINT_copy(t, a); | |
758 | if (!r) { | |
759 | EC_POINT_free(t); | |
760 | return NULL; | |
8fdc3734 RS |
761 | } |
762 | return t; | |
0f113f3e | 763 | } |
7793f30e | 764 | |
48fe4d62 | 765 | const EC_METHOD *EC_POINT_method_of(const EC_POINT *point) |
0f113f3e MC |
766 | { |
767 | return point->meth; | |
768 | } | |
48fe4d62 | 769 | |
226cc7de | 770 | int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point) |
0f113f3e MC |
771 | { |
772 | if (group->meth->point_set_to_infinity == 0) { | |
773 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, | |
774 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
775 | return 0; | |
776 | } | |
777 | if (group->meth != point->meth) { | |
778 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); | |
779 | return 0; | |
780 | } | |
781 | return group->meth->point_set_to_infinity(group, point); | |
782 | } | |
783 | ||
784 | int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
785 | EC_POINT *point, const BIGNUM *x, | |
786 | const BIGNUM *y, const BIGNUM *z, | |
787 | BN_CTX *ctx) | |
788 | { | |
789 | if (group->meth->point_set_Jprojective_coordinates_GFp == 0) { | |
790 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, | |
791 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
792 | return 0; | |
793 | } | |
794 | if (group->meth != point->meth) { | |
795 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, | |
796 | EC_R_INCOMPATIBLE_OBJECTS); | |
797 | return 0; | |
798 | } | |
799 | return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, | |
800 | y, z, ctx); | |
801 | } | |
802 | ||
803 | int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
804 | const EC_POINT *point, BIGNUM *x, | |
805 | BIGNUM *y, BIGNUM *z, | |
806 | BN_CTX *ctx) | |
807 | { | |
808 | if (group->meth->point_get_Jprojective_coordinates_GFp == 0) { | |
809 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, | |
810 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
811 | return 0; | |
812 | } | |
813 | if (group->meth != point->meth) { | |
814 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, | |
815 | EC_R_INCOMPATIBLE_OBJECTS); | |
816 | return 0; | |
817 | } | |
818 | return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, | |
819 | y, z, ctx); | |
820 | } | |
821 | ||
822 | int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, | |
823 | EC_POINT *point, const BIGNUM *x, | |
824 | const BIGNUM *y, BN_CTX *ctx) | |
825 | { | |
826 | if (group->meth->point_set_affine_coordinates == 0) { | |
827 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, | |
828 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
829 | return 0; | |
830 | } | |
831 | if (group->meth != point->meth) { | |
832 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, | |
833 | EC_R_INCOMPATIBLE_OBJECTS); | |
834 | return 0; | |
835 | } | |
836 | return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); | |
837 | } | |
226cc7de | 838 | |
b3310161 | 839 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
840 | int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, |
841 | EC_POINT *point, const BIGNUM *x, | |
842 | const BIGNUM *y, BN_CTX *ctx) | |
843 | { | |
844 | if (group->meth->point_set_affine_coordinates == 0) { | |
845 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, | |
846 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
847 | return 0; | |
848 | } | |
849 | if (group->meth != point->meth) { | |
850 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, | |
851 | EC_R_INCOMPATIBLE_OBJECTS); | |
852 | return 0; | |
853 | } | |
854 | return group->meth->point_set_affine_coordinates(group, point, x, y, ctx); | |
855 | } | |
b3310161 | 856 | #endif |
7793f30e | 857 | |
0f113f3e MC |
858 | int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, |
859 | const EC_POINT *point, BIGNUM *x, | |
860 | BIGNUM *y, BN_CTX *ctx) | |
861 | { | |
862 | if (group->meth->point_get_affine_coordinates == 0) { | |
863 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, | |
864 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
865 | return 0; | |
866 | } | |
867 | if (group->meth != point->meth) { | |
868 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, | |
869 | EC_R_INCOMPATIBLE_OBJECTS); | |
870 | return 0; | |
871 | } | |
872 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); | |
873 | } | |
7793f30e | 874 | |
b3310161 | 875 | #ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
876 | int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, |
877 | const EC_POINT *point, BIGNUM *x, | |
878 | BIGNUM *y, BN_CTX *ctx) | |
879 | { | |
880 | if (group->meth->point_get_affine_coordinates == 0) { | |
881 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, | |
882 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
883 | return 0; | |
884 | } | |
885 | if (group->meth != point->meth) { | |
886 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, | |
887 | EC_R_INCOMPATIBLE_OBJECTS); | |
888 | return 0; | |
889 | } | |
890 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); | |
891 | } | |
b3310161 | 892 | #endif |
7793f30e | 893 | |
0f113f3e MC |
894 | int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, |
895 | const EC_POINT *b, BN_CTX *ctx) | |
896 | { | |
897 | if (group->meth->add == 0) { | |
898 | ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
899 | return 0; | |
900 | } | |
901 | if ((group->meth != r->meth) || (r->meth != a->meth) | |
902 | || (a->meth != b->meth)) { | |
903 | ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS); | |
904 | return 0; | |
905 | } | |
906 | return group->meth->add(group, r, a, b, ctx); | |
907 | } | |
908 | ||
909 | int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, | |
910 | BN_CTX *ctx) | |
911 | { | |
912 | if (group->meth->dbl == 0) { | |
913 | ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
914 | return 0; | |
915 | } | |
916 | if ((group->meth != r->meth) || (r->meth != a->meth)) { | |
917 | ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS); | |
918 | return 0; | |
919 | } | |
920 | return group->meth->dbl(group, r, a, ctx); | |
921 | } | |
0657bf9c | 922 | |
1d5bd6cf | 923 | int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) |
0f113f3e MC |
924 | { |
925 | if (group->meth->invert == 0) { | |
926 | ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
927 | return 0; | |
928 | } | |
929 | if (group->meth != a->meth) { | |
930 | ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS); | |
931 | return 0; | |
932 | } | |
933 | return group->meth->invert(group, a, ctx); | |
934 | } | |
1d5bd6cf | 935 | |
0657bf9c | 936 | int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) |
0f113f3e MC |
937 | { |
938 | if (group->meth->is_at_infinity == 0) { | |
939 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, | |
940 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
941 | return 0; | |
942 | } | |
943 | if (group->meth != point->meth) { | |
944 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); | |
945 | return 0; | |
946 | } | |
947 | return group->meth->is_at_infinity(group, point); | |
948 | } | |
949 | ||
68886be7 MC |
950 | /* |
951 | * Check whether an EC_POINT is on the curve or not. Note that the return | |
952 | * value for this function should NOT be treated as a boolean. Return values: | |
953 | * 1: The point is on the curve | |
954 | * 0: The point is not on the curve | |
955 | * -1: An error occurred | |
956 | */ | |
0f113f3e MC |
957 | int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, |
958 | BN_CTX *ctx) | |
959 | { | |
960 | if (group->meth->is_on_curve == 0) { | |
961 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
962 | return 0; | |
963 | } | |
964 | if (group->meth != point->meth) { | |
965 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS); | |
966 | return 0; | |
967 | } | |
968 | return group->meth->is_on_curve(group, point, ctx); | |
969 | } | |
970 | ||
971 | int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, | |
972 | BN_CTX *ctx) | |
973 | { | |
974 | if (group->meth->point_cmp == 0) { | |
975 | ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
976 | return -1; | |
977 | } | |
978 | if ((group->meth != a->meth) || (a->meth != b->meth)) { | |
979 | ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS); | |
980 | return -1; | |
981 | } | |
982 | return group->meth->point_cmp(group, a, b, ctx); | |
983 | } | |
1d5bd6cf | 984 | |
e869d4bd | 985 | int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) |
0f113f3e MC |
986 | { |
987 | if (group->meth->make_affine == 0) { | |
988 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
989 | return 0; | |
990 | } | |
991 | if (group->meth != point->meth) { | |
992 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); | |
993 | return 0; | |
994 | } | |
995 | return group->meth->make_affine(group, point, ctx); | |
996 | } | |
997 | ||
998 | int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, | |
999 | EC_POINT *points[], BN_CTX *ctx) | |
1000 | { | |
1001 | size_t i; | |
1002 | ||
1003 | if (group->meth->points_make_affine == 0) { | |
1004 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
1005 | return 0; | |
1006 | } | |
1007 | for (i = 0; i < num; i++) { | |
1008 | if (group->meth != points[i]->meth) { | |
1009 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); | |
1010 | return 0; | |
1011 | } | |
1012 | } | |
1013 | return group->meth->points_make_affine(group, num, points, ctx); | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Functions for point multiplication. If group->meth->mul is 0, we use the | |
1018 | * wNAF-based implementations in ec_mult.c; otherwise we dispatch through | |
1019 | * methods. | |
37c660ff BM |
1020 | */ |
1021 | ||
1022 | int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, | |
0f113f3e MC |
1023 | size_t num, const EC_POINT *points[], |
1024 | const BIGNUM *scalars[], BN_CTX *ctx) | |
1025 | { | |
1026 | if (group->meth->mul == 0) | |
1027 | /* use default */ | |
1028 | return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); | |
37c660ff | 1029 | |
0f113f3e MC |
1030 | return group->meth->mul(group, r, scalar, num, points, scalars, ctx); |
1031 | } | |
37c660ff BM |
1032 | |
1033 | int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, | |
0f113f3e MC |
1034 | const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) |
1035 | { | |
1036 | /* just a convenient interface to EC_POINTs_mul() */ | |
37c660ff | 1037 | |
0f113f3e MC |
1038 | const EC_POINT *points[1]; |
1039 | const BIGNUM *scalars[1]; | |
37c660ff | 1040 | |
0f113f3e MC |
1041 | points[0] = point; |
1042 | scalars[0] = p_scalar; | |
37c660ff | 1043 | |
0f113f3e MC |
1044 | return EC_POINTs_mul(group, r, g_scalar, |
1045 | (point != NULL | |
1046 | && p_scalar != NULL), points, scalars, ctx); | |
1047 | } | |
37c660ff BM |
1048 | |
1049 | int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx) | |
0f113f3e MC |
1050 | { |
1051 | if (group->meth->mul == 0) | |
1052 | /* use default */ | |
1053 | return ec_wNAF_precompute_mult(group, ctx); | |
37c660ff | 1054 | |
0f113f3e MC |
1055 | if (group->meth->precompute_mult != 0) |
1056 | return group->meth->precompute_mult(group, ctx); | |
1057 | else | |
1058 | return 1; /* nothing to do, so report success */ | |
1059 | } | |
37c660ff BM |
1060 | |
1061 | int EC_GROUP_have_precompute_mult(const EC_GROUP *group) | |
0f113f3e MC |
1062 | { |
1063 | if (group->meth->mul == 0) | |
1064 | /* use default */ | |
1065 | return ec_wNAF_have_precompute_mult(group); | |
1066 | ||
1067 | if (group->meth->have_precompute_mult != 0) | |
1068 | return group->meth->have_precompute_mult(group); | |
1069 | else | |
1070 | return 0; /* cannot tell whether precomputation has | |
1071 | * been performed */ | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * ec_precompute_mont_data sets |group->mont_data| from |group->order| and | |
1076 | * returns one on success. On error it returns zero. | |
1077 | */ | |
f54be179 | 1078 | int ec_precompute_mont_data(EC_GROUP *group) |
0f113f3e MC |
1079 | { |
1080 | BN_CTX *ctx = BN_CTX_new(); | |
1081 | int ret = 0; | |
1082 | ||
23a1d5e9 RS |
1083 | BN_MONT_CTX_free(group->mont_data); |
1084 | group->mont_data = NULL; | |
0f113f3e MC |
1085 | |
1086 | if (ctx == NULL) | |
1087 | goto err; | |
1088 | ||
1089 | group->mont_data = BN_MONT_CTX_new(); | |
1090 | if (!group->mont_data) | |
1091 | goto err; | |
1092 | ||
1093 | if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) { | |
1094 | BN_MONT_CTX_free(group->mont_data); | |
1095 | group->mont_data = NULL; | |
1096 | goto err; | |
1097 | } | |
1098 | ||
1099 | ret = 1; | |
1100 | ||
1101 | err: | |
1102 | ||
23a1d5e9 | 1103 | BN_CTX_free(ctx); |
0f113f3e MC |
1104 | return ret; |
1105 | } |