2 * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
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
13 #include <openssl/err.h>
14 #include <openssl/opensslv.h>
18 /* functions for EC_GROUP objects */
20 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
25 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
28 if (meth->group_init == 0) {
29 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
33 ret = OPENSSL_zalloc(sizeof(*ret));
35 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
40 if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
41 ret->order = BN_new();
42 if (ret->order == NULL)
44 ret->cofactor = BN_new();
45 if (ret->cofactor == NULL)
48 ret->asn1_flag = OPENSSL_EC_NAMED_CURVE;
49 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
50 if (!meth->group_init(ret))
56 BN_free(ret->cofactor);
61 void EC_pre_comp_free(EC_GROUP *group)
63 switch (group->pre_comp_type) {
67 #ifdef ECP_NISTZ256_ASM
68 EC_nistz256_pre_comp_free(group->pre_comp.nistz256);
71 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
73 EC_nistp224_pre_comp_free(group->pre_comp.nistp224);
76 EC_nistp256_pre_comp_free(group->pre_comp.nistp256);
79 EC_nistp521_pre_comp_free(group->pre_comp.nistp521);
88 EC_ec_pre_comp_free(group->pre_comp.ec);
91 group->pre_comp.ec = NULL;
94 void EC_GROUP_free(EC_GROUP *group)
99 if (group->meth->group_finish != 0)
100 group->meth->group_finish(group);
102 EC_pre_comp_free(group);
103 BN_MONT_CTX_free(group->mont_data);
104 EC_POINT_free(group->generator);
105 BN_free(group->order);
106 BN_free(group->cofactor);
107 OPENSSL_free(group->seed);
111 void EC_GROUP_clear_free(EC_GROUP *group)
116 if (group->meth->group_clear_finish != 0)
117 group->meth->group_clear_finish(group);
118 else if (group->meth->group_finish != 0)
119 group->meth->group_finish(group);
121 EC_pre_comp_free(group);
122 BN_MONT_CTX_free(group->mont_data);
123 EC_POINT_clear_free(group->generator);
124 BN_clear_free(group->order);
125 BN_clear_free(group->cofactor);
126 OPENSSL_clear_free(group->seed, group->seed_len);
127 OPENSSL_clear_free(group, sizeof(*group));
130 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
132 if (dest->meth->group_copy == 0) {
133 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
136 if (dest->meth != src->meth) {
137 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
143 /* Copy precomputed */
144 dest->pre_comp_type = src->pre_comp_type;
145 switch (src->pre_comp_type) {
147 dest->pre_comp.ec = NULL;
150 #ifdef ECP_NISTZ256_ASM
151 dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256);
154 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
156 dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224);
159 dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256);
162 dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521);
171 dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec);
175 if (src->mont_data != NULL) {
176 if (dest->mont_data == NULL) {
177 dest->mont_data = BN_MONT_CTX_new();
178 if (dest->mont_data == NULL)
181 if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
184 /* src->generator == NULL */
185 BN_MONT_CTX_free(dest->mont_data);
186 dest->mont_data = NULL;
189 if (src->generator != NULL) {
190 if (dest->generator == NULL) {
191 dest->generator = EC_POINT_new(dest);
192 if (dest->generator == NULL)
195 if (!EC_POINT_copy(dest->generator, src->generator))
198 /* src->generator == NULL */
199 EC_POINT_clear_free(dest->generator);
200 dest->generator = NULL;
203 if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
204 if (!BN_copy(dest->order, src->order))
206 if (!BN_copy(dest->cofactor, src->cofactor))
210 dest->curve_name = src->curve_name;
211 dest->asn1_flag = src->asn1_flag;
212 dest->asn1_form = src->asn1_form;
215 OPENSSL_free(dest->seed);
216 dest->seed = OPENSSL_malloc(src->seed_len);
217 if (dest->seed == NULL)
219 if (!memcpy(dest->seed, src->seed, src->seed_len))
221 dest->seed_len = src->seed_len;
223 OPENSSL_free(dest->seed);
228 return dest->meth->group_copy(dest, src);
231 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
239 if ((t = EC_GROUP_new(a->meth)) == NULL)
241 if (!EC_GROUP_copy(t, a))
254 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
259 int EC_METHOD_get_field_type(const EC_METHOD *meth)
261 return meth->field_type;
264 static int ec_precompute_mont_data(EC_GROUP *);
266 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
267 const BIGNUM *order, const BIGNUM *cofactor)
269 if (generator == NULL) {
270 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
274 if (group->generator == NULL) {
275 group->generator = EC_POINT_new(group);
276 if (group->generator == NULL)
279 if (!EC_POINT_copy(group->generator, generator))
283 if (!BN_copy(group->order, order))
286 BN_zero(group->order);
288 if (cofactor != NULL) {
289 if (!BN_copy(group->cofactor, cofactor))
292 BN_zero(group->cofactor);
295 * Some groups have an order with
296 * factors of two, which makes the Montgomery setup fail.
297 * |group->mont_data| will be NULL in this case.
299 if (BN_is_odd(group->order)) {
300 return ec_precompute_mont_data(group);
303 BN_MONT_CTX_free(group->mont_data);
304 group->mont_data = NULL;
308 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
310 return group->generator;
313 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
315 return group->mont_data;
318 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
320 if (group->order == NULL)
322 if (!BN_copy(order, group->order))
325 return !BN_is_zero(order);
328 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
333 int EC_GROUP_order_bits(const EC_GROUP *group)
335 return group->meth->group_order_bits(group);
338 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
342 if (group->cofactor == NULL)
344 if (!BN_copy(cofactor, group->cofactor))
347 return !BN_is_zero(group->cofactor);
350 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
352 return group->cofactor;
355 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
357 group->curve_name = nid;
360 int EC_GROUP_get_curve_name(const EC_GROUP *group)
362 return group->curve_name;
365 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
367 group->asn1_flag = flag;
370 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
372 return group->asn1_flag;
375 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
376 point_conversion_form_t form)
378 group->asn1_form = form;
381 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
384 return group->asn1_form;
387 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
389 OPENSSL_free(group->seed);
396 if ((group->seed = OPENSSL_malloc(len)) == NULL)
398 memcpy(group->seed, p, len);
399 group->seed_len = len;
404 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
409 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
411 return group->seed_len;
414 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
415 const BIGNUM *b, BN_CTX *ctx)
417 if (group->meth->group_set_curve == 0) {
418 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
421 return group->meth->group_set_curve(group, p, a, b, ctx);
424 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
425 BIGNUM *b, BN_CTX *ctx)
427 if (group->meth->group_get_curve == 0) {
428 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
431 return group->meth->group_get_curve(group, p, a, b, ctx);
434 #ifndef OPENSSL_NO_EC2M
435 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
436 const BIGNUM *b, BN_CTX *ctx)
438 if (group->meth->group_set_curve == 0) {
439 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
440 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
443 return group->meth->group_set_curve(group, p, a, b, ctx);
446 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
447 BIGNUM *b, BN_CTX *ctx)
449 if (group->meth->group_get_curve == 0) {
450 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
451 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
454 return group->meth->group_get_curve(group, p, a, b, ctx);
458 int EC_GROUP_get_degree(const EC_GROUP *group)
460 if (group->meth->group_get_degree == 0) {
461 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
464 return group->meth->group_get_degree(group);
467 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
469 if (group->meth->group_check_discriminant == 0) {
470 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
471 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
474 return group->meth->group_check_discriminant(group, ctx);
477 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
480 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
481 BN_CTX *ctx_new = NULL;
483 /* compare the field types */
484 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
485 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
487 /* compare the curve name (if present in both) */
488 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
489 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
491 if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
495 ctx_new = ctx = BN_CTX_new();
500 a1 = BN_CTX_get(ctx);
501 a2 = BN_CTX_get(ctx);
502 a3 = BN_CTX_get(ctx);
503 b1 = BN_CTX_get(ctx);
504 b2 = BN_CTX_get(ctx);
505 b3 = BN_CTX_get(ctx);
508 BN_CTX_free(ctx_new);
513 * XXX This approach assumes that the external representation of curves
514 * over the same field type is the same.
516 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
517 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
520 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
523 /* XXX EC_POINT_cmp() assumes that the methods are equal */
524 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
525 EC_GROUP_get0_generator(b), ctx))
529 const BIGNUM *ao, *bo, *ac, *bc;
530 /* compare the order and cofactor */
531 ao = EC_GROUP_get0_order(a);
532 bo = EC_GROUP_get0_order(b);
533 ac = EC_GROUP_get0_cofactor(a);
534 bc = EC_GROUP_get0_cofactor(b);
535 if (ao == NULL || bo == NULL) {
537 BN_CTX_free(ctx_new);
540 if (BN_cmp(ao, bo) || BN_cmp(ac, bc))
545 BN_CTX_free(ctx_new);
550 /* functions for EC_POINT objects */
552 EC_POINT *EC_POINT_new(const EC_GROUP *group)
557 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
560 if (group->meth->point_init == 0) {
561 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
565 ret = OPENSSL_zalloc(sizeof(*ret));
567 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
571 ret->meth = group->meth;
573 if (!ret->meth->point_init(ret)) {
581 void EC_POINT_free(EC_POINT *point)
586 if (point->meth->point_finish != 0)
587 point->meth->point_finish(point);
591 void EC_POINT_clear_free(EC_POINT *point)
596 if (point->meth->point_clear_finish != 0)
597 point->meth->point_clear_finish(point);
598 else if (point->meth->point_finish != 0)
599 point->meth->point_finish(point);
600 OPENSSL_clear_free(point, sizeof(*point));
603 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
605 if (dest->meth->point_copy == 0) {
606 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
609 if (dest->meth != src->meth) {
610 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
615 return dest->meth->point_copy(dest, src);
618 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
626 t = EC_POINT_new(group);
629 r = EC_POINT_copy(t, a);
637 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
642 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
644 if (group->meth->point_set_to_infinity == 0) {
645 ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
646 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
649 if (group->meth != point->meth) {
650 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
653 return group->meth->point_set_to_infinity(group, point);
656 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
657 EC_POINT *point, const BIGNUM *x,
658 const BIGNUM *y, const BIGNUM *z,
661 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
662 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
663 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
666 if (group->meth != point->meth) {
667 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
668 EC_R_INCOMPATIBLE_OBJECTS);
671 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
675 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
676 const EC_POINT *point, BIGNUM *x,
677 BIGNUM *y, BIGNUM *z,
680 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
681 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
682 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
685 if (group->meth != point->meth) {
686 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
687 EC_R_INCOMPATIBLE_OBJECTS);
690 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
694 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
695 EC_POINT *point, const BIGNUM *x,
696 const BIGNUM *y, BN_CTX *ctx)
698 if (group->meth->point_set_affine_coordinates == 0) {
699 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
700 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
703 if (group->meth != point->meth) {
704 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
705 EC_R_INCOMPATIBLE_OBJECTS);
708 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
711 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
712 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
713 EC_R_POINT_IS_NOT_ON_CURVE);
719 #ifndef OPENSSL_NO_EC2M
720 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
721 EC_POINT *point, const BIGNUM *x,
722 const BIGNUM *y, BN_CTX *ctx)
724 if (group->meth->point_set_affine_coordinates == 0) {
725 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
726 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
729 if (group->meth != point->meth) {
730 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
731 EC_R_INCOMPATIBLE_OBJECTS);
734 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
737 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
738 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
739 EC_R_POINT_IS_NOT_ON_CURVE);
746 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
747 const EC_POINT *point, BIGNUM *x,
748 BIGNUM *y, BN_CTX *ctx)
750 if (group->meth->point_get_affine_coordinates == 0) {
751 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
752 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
755 if (group->meth != point->meth) {
756 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
757 EC_R_INCOMPATIBLE_OBJECTS);
760 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
763 #ifndef OPENSSL_NO_EC2M
764 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
765 const EC_POINT *point, BIGNUM *x,
766 BIGNUM *y, BN_CTX *ctx)
768 if (group->meth->point_get_affine_coordinates == 0) {
769 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
770 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
773 if (group->meth != point->meth) {
774 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
775 EC_R_INCOMPATIBLE_OBJECTS);
778 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
782 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
783 const EC_POINT *b, BN_CTX *ctx)
785 if (group->meth->add == 0) {
786 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
789 if ((group->meth != r->meth) || (r->meth != a->meth)
790 || (a->meth != b->meth)) {
791 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
794 return group->meth->add(group, r, a, b, ctx);
797 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
800 if (group->meth->dbl == 0) {
801 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
804 if ((group->meth != r->meth) || (r->meth != a->meth)) {
805 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
808 return group->meth->dbl(group, r, a, ctx);
811 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
813 if (group->meth->invert == 0) {
814 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
817 if (group->meth != a->meth) {
818 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
821 return group->meth->invert(group, a, ctx);
824 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
826 if (group->meth->is_at_infinity == 0) {
827 ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
828 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
831 if (group->meth != point->meth) {
832 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
835 return group->meth->is_at_infinity(group, point);
839 * Check whether an EC_POINT is on the curve or not. Note that the return
840 * value for this function should NOT be treated as a boolean. Return values:
841 * 1: The point is on the curve
842 * 0: The point is not on the curve
843 * -1: An error occurred
845 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
848 if (group->meth->is_on_curve == 0) {
849 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
852 if (group->meth != point->meth) {
853 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
856 return group->meth->is_on_curve(group, point, ctx);
859 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
862 if (group->meth->point_cmp == 0) {
863 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
866 if ((group->meth != a->meth) || (a->meth != b->meth)) {
867 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
870 return group->meth->point_cmp(group, a, b, ctx);
873 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
875 if (group->meth->make_affine == 0) {
876 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
879 if (group->meth != point->meth) {
880 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
883 return group->meth->make_affine(group, point, ctx);
886 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
887 EC_POINT *points[], BN_CTX *ctx)
891 if (group->meth->points_make_affine == 0) {
892 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
895 for (i = 0; i < num; i++) {
896 if (group->meth != points[i]->meth) {
897 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
901 return group->meth->points_make_affine(group, num, points, ctx);
905 * Functions for point multiplication. If group->meth->mul is 0, we use the
906 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
910 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
911 size_t num, const EC_POINT *points[],
912 const BIGNUM *scalars[], BN_CTX *ctx)
914 if (group->meth->mul == 0)
916 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
918 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
921 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
922 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
924 /* just a convenient interface to EC_POINTs_mul() */
926 const EC_POINT *points[1];
927 const BIGNUM *scalars[1];
930 scalars[0] = p_scalar;
932 return EC_POINTs_mul(group, r, g_scalar,
934 && p_scalar != NULL), points, scalars, ctx);
937 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
939 if (group->meth->mul == 0)
941 return ec_wNAF_precompute_mult(group, ctx);
943 if (group->meth->precompute_mult != 0)
944 return group->meth->precompute_mult(group, ctx);
946 return 1; /* nothing to do, so report success */
949 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
951 if (group->meth->mul == 0)
953 return ec_wNAF_have_precompute_mult(group);
955 if (group->meth->have_precompute_mult != 0)
956 return group->meth->have_precompute_mult(group);
958 return 0; /* cannot tell whether precomputation has
963 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
964 * returns one on success. On error it returns zero.
966 static int ec_precompute_mont_data(EC_GROUP *group)
968 BN_CTX *ctx = BN_CTX_new();
971 BN_MONT_CTX_free(group->mont_data);
972 group->mont_data = NULL;
977 group->mont_data = BN_MONT_CTX_new();
978 if (group->mont_data == NULL)
981 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
982 BN_MONT_CTX_free(group->mont_data);
983 group->mont_data = NULL;
995 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
997 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
1000 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
1002 return CRYPTO_get_ex_data(&key->ex_data, idx);
1005 int ec_group_simple_order_bits(const EC_GROUP *group)
1007 if (group->order == NULL)
1009 return BN_num_bits(group->order);
1012 int EC_GROUP_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
1013 BIGNUM *x, BN_CTX *ctx)
1015 if (group->meth->field_inverse_mod_ord != NULL)
1016 return group->meth->field_inverse_mod_ord(group, res, x, ctx);