2 * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
12 * Binary polynomial ECC support in OpenSSL originally developed by
13 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
18 #include <openssl/err.h>
19 #include <openssl/opensslv.h>
23 /* functions for EC_GROUP objects */
25 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
30 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
33 if (meth->group_init == 0) {
34 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
38 ret = OPENSSL_zalloc(sizeof(*ret));
40 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
45 if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
46 ret->order = BN_new();
47 if (ret->order == NULL)
49 ret->cofactor = BN_new();
50 if (ret->cofactor == NULL)
53 ret->asn1_flag = OPENSSL_EC_NAMED_CURVE;
54 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
55 if (!meth->group_init(ret))
61 BN_free(ret->cofactor);
66 void EC_pre_comp_free(EC_GROUP *group)
68 switch (group->pre_comp_type) {
71 #ifdef ECP_NISTZ256_REFERENCE_IMPLEMENTATION
73 EC_nistz256_pre_comp_free(group->pre_comp.nistz256);
76 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
78 EC_nistp224_pre_comp_free(group->pre_comp.nistp224);
81 EC_nistp256_pre_comp_free(group->pre_comp.nistp256);
84 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 dest->curve_name = src->curve_name;
145 /* Copy precomputed */
146 dest->pre_comp_type = src->pre_comp_type;
147 switch (src->pre_comp_type) {
149 dest->pre_comp.ec = NULL;
151 #ifdef ECP_NISTZ256_REFERENCE_IMPLEMENTATION
153 dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256);
156 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
158 dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224);
161 dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256);
164 dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521);
168 dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec);
172 if (src->mont_data != NULL) {
173 if (dest->mont_data == NULL) {
174 dest->mont_data = BN_MONT_CTX_new();
175 if (dest->mont_data == NULL)
178 if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
181 /* src->generator == NULL */
182 BN_MONT_CTX_free(dest->mont_data);
183 dest->mont_data = NULL;
186 if (src->generator != NULL) {
187 if (dest->generator == NULL) {
188 dest->generator = EC_POINT_new(dest);
189 if (dest->generator == NULL)
192 if (!EC_POINT_copy(dest->generator, src->generator))
195 /* src->generator == NULL */
196 EC_POINT_clear_free(dest->generator);
197 dest->generator = NULL;
200 if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
201 if (!BN_copy(dest->order, src->order))
203 if (!BN_copy(dest->cofactor, src->cofactor))
207 dest->asn1_flag = src->asn1_flag;
208 dest->asn1_form = src->asn1_form;
211 OPENSSL_free(dest->seed);
212 dest->seed = OPENSSL_malloc(src->seed_len);
213 if (dest->seed == NULL)
215 if (!memcpy(dest->seed, src->seed, src->seed_len))
217 dest->seed_len = src->seed_len;
219 OPENSSL_free(dest->seed);
224 return dest->meth->group_copy(dest, src);
227 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
235 if ((t = EC_GROUP_new(a->meth)) == NULL)
237 if (!EC_GROUP_copy(t, a))
250 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
255 int EC_METHOD_get_field_type(const EC_METHOD *meth)
257 return meth->field_type;
260 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
261 const BIGNUM *order, const BIGNUM *cofactor)
263 if (generator == NULL) {
264 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
268 if (group->generator == NULL) {
269 group->generator = EC_POINT_new(group);
270 if (group->generator == NULL)
273 if (!EC_POINT_copy(group->generator, generator))
277 if (!BN_copy(group->order, order))
280 BN_zero(group->order);
282 if (cofactor != NULL) {
283 if (!BN_copy(group->cofactor, cofactor))
286 BN_zero(group->cofactor);
289 * Some groups have an order with
290 * factors of two, which makes the Montgomery setup fail.
291 * |group->mont_data| will be NULL in this case.
293 if (BN_is_odd(group->order)) {
294 return ec_precompute_mont_data(group);
297 BN_MONT_CTX_free(group->mont_data);
298 group->mont_data = NULL;
302 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
304 return group->generator;
307 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
309 return group->mont_data;
312 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
314 if (group->order == NULL)
316 if (!BN_copy(order, group->order))
319 return !BN_is_zero(order);
322 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
327 int EC_GROUP_order_bits(const EC_GROUP *group)
329 OPENSSL_assert(group->meth->group_order_bits != NULL);
330 return group->meth->group_order_bits(group);
333 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
337 if (group->cofactor == NULL)
339 if (!BN_copy(cofactor, group->cofactor))
342 return !BN_is_zero(group->cofactor);
345 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
347 return group->cofactor;
350 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
352 group->curve_name = nid;
355 int EC_GROUP_get_curve_name(const EC_GROUP *group)
357 return group->curve_name;
360 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
362 group->asn1_flag = flag;
365 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
367 return group->asn1_flag;
370 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
371 point_conversion_form_t form)
373 group->asn1_form = form;
376 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
379 return group->asn1_form;
382 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
384 OPENSSL_free(group->seed);
391 if ((group->seed = OPENSSL_malloc(len)) == NULL)
393 memcpy(group->seed, p, len);
394 group->seed_len = len;
399 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
404 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
406 return group->seed_len;
409 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
410 const BIGNUM *b, BN_CTX *ctx)
412 if (group->meth->group_set_curve == 0) {
413 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
416 return group->meth->group_set_curve(group, p, a, b, ctx);
419 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
420 BIGNUM *b, BN_CTX *ctx)
422 if (group->meth->group_get_curve == 0) {
423 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
426 return group->meth->group_get_curve(group, p, a, b, ctx);
429 #ifndef OPENSSL_NO_EC2M
430 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
431 const BIGNUM *b, BN_CTX *ctx)
433 if (group->meth->group_set_curve == 0) {
434 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
435 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
438 return group->meth->group_set_curve(group, p, a, b, ctx);
441 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
442 BIGNUM *b, BN_CTX *ctx)
444 if (group->meth->group_get_curve == 0) {
445 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
446 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
449 return group->meth->group_get_curve(group, p, a, b, ctx);
453 int EC_GROUP_get_degree(const EC_GROUP *group)
455 if (group->meth->group_get_degree == 0) {
456 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
459 return group->meth->group_get_degree(group);
462 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
464 if (group->meth->group_check_discriminant == 0) {
465 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
466 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
469 return group->meth->group_check_discriminant(group, ctx);
472 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
475 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
476 BN_CTX *ctx_new = NULL;
478 /* compare the field types */
479 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
480 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
482 /* compare the curve name (if present in both) */
483 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
484 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
486 if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
490 ctx_new = ctx = BN_CTX_new();
495 a1 = BN_CTX_get(ctx);
496 a2 = BN_CTX_get(ctx);
497 a3 = BN_CTX_get(ctx);
498 b1 = BN_CTX_get(ctx);
499 b2 = BN_CTX_get(ctx);
500 b3 = BN_CTX_get(ctx);
503 BN_CTX_free(ctx_new);
508 * XXX This approach assumes that the external representation of curves
509 * over the same field type is the same.
511 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
512 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
515 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
518 /* XXX EC_POINT_cmp() assumes that the methods are equal */
519 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
520 EC_GROUP_get0_generator(b), ctx))
524 const BIGNUM *ao, *bo, *ac, *bc;
525 /* compare the order and cofactor */
526 ao = EC_GROUP_get0_order(a);
527 bo = EC_GROUP_get0_order(b);
528 ac = EC_GROUP_get0_cofactor(a);
529 bc = EC_GROUP_get0_cofactor(b);
530 if (ao == NULL || bo == NULL) {
532 BN_CTX_free(ctx_new);
535 if (BN_cmp(ao, bo) || BN_cmp(ac, bc))
540 BN_CTX_free(ctx_new);
545 /* functions for EC_POINT objects */
547 EC_POINT *EC_POINT_new(const EC_GROUP *group)
552 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
555 if (group->meth->point_init == 0) {
556 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
560 ret = OPENSSL_zalloc(sizeof(*ret));
562 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
566 ret->meth = group->meth;
567 ret->curve_name = group->curve_name;
569 if (!ret->meth->point_init(ret)) {
577 void EC_POINT_free(EC_POINT *point)
582 if (point->meth->point_finish != 0)
583 point->meth->point_finish(point);
587 void EC_POINT_clear_free(EC_POINT *point)
592 if (point->meth->point_clear_finish != 0)
593 point->meth->point_clear_finish(point);
594 else if (point->meth->point_finish != 0)
595 point->meth->point_finish(point);
596 OPENSSL_clear_free(point, sizeof(*point));
599 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
601 if (dest->meth->point_copy == 0) {
602 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
605 if (dest->meth != src->meth
606 || (dest->curve_name != src->curve_name
607 && dest->curve_name != 0
608 && src->curve_name != 0)) {
609 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
614 return dest->meth->point_copy(dest, src);
617 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
625 t = EC_POINT_new(group);
628 r = EC_POINT_copy(t, a);
636 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
641 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
643 if (group->meth->point_set_to_infinity == 0) {
644 ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
645 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
648 if (group->meth != point->meth) {
649 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
652 return group->meth->point_set_to_infinity(group, point);
655 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
656 EC_POINT *point, const BIGNUM *x,
657 const BIGNUM *y, const BIGNUM *z,
660 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
661 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
662 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
665 if (!ec_point_is_compat(point, group)) {
666 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
667 EC_R_INCOMPATIBLE_OBJECTS);
670 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
674 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
675 const EC_POINT *point, BIGNUM *x,
676 BIGNUM *y, BIGNUM *z,
679 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
680 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
681 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
684 if (!ec_point_is_compat(point, group)) {
685 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
686 EC_R_INCOMPATIBLE_OBJECTS);
689 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
693 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
694 EC_POINT *point, const BIGNUM *x,
695 const BIGNUM *y, BN_CTX *ctx)
697 if (group->meth->point_set_affine_coordinates == 0) {
698 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
699 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
702 if (!ec_point_is_compat(point, group)) {
703 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
704 EC_R_INCOMPATIBLE_OBJECTS);
707 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
710 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
711 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
712 EC_R_POINT_IS_NOT_ON_CURVE);
718 #ifndef OPENSSL_NO_EC2M
719 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
720 EC_POINT *point, const BIGNUM *x,
721 const BIGNUM *y, BN_CTX *ctx)
723 if (group->meth->point_set_affine_coordinates == 0) {
724 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
725 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
728 if (!ec_point_is_compat(point, group)) {
729 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
730 EC_R_INCOMPATIBLE_OBJECTS);
733 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
736 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
737 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
738 EC_R_POINT_IS_NOT_ON_CURVE);
745 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
746 const EC_POINT *point, BIGNUM *x,
747 BIGNUM *y, BN_CTX *ctx)
749 if (group->meth->point_get_affine_coordinates == 0) {
750 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
751 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
754 if (!ec_point_is_compat(point, group)) {
755 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
756 EC_R_INCOMPATIBLE_OBJECTS);
759 if (EC_POINT_is_at_infinity(group, point)) {
760 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
761 EC_R_POINT_AT_INFINITY);
764 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
767 #ifndef OPENSSL_NO_EC2M
768 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
769 const EC_POINT *point, BIGNUM *x,
770 BIGNUM *y, BN_CTX *ctx)
772 if (group->meth->point_get_affine_coordinates == 0) {
773 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
774 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
777 if (!ec_point_is_compat(point, group)) {
778 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
779 EC_R_INCOMPATIBLE_OBJECTS);
782 if (EC_POINT_is_at_infinity(group, point)) {
783 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
784 EC_R_POINT_AT_INFINITY);
787 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
791 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
792 const EC_POINT *b, BN_CTX *ctx)
794 if (group->meth->add == 0) {
795 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
798 if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)
799 || !ec_point_is_compat(b, group)) {
800 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
803 return group->meth->add(group, r, a, b, ctx);
806 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
809 if (group->meth->dbl == 0) {
810 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
813 if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)) {
814 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
817 return group->meth->dbl(group, r, a, ctx);
820 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
822 if (group->meth->invert == 0) {
823 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
826 if (!ec_point_is_compat(a, group)) {
827 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
830 return group->meth->invert(group, a, ctx);
833 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
835 if (group->meth->is_at_infinity == 0) {
836 ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
837 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
840 if (!ec_point_is_compat(point, group)) {
841 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
844 return group->meth->is_at_infinity(group, point);
848 * Check whether an EC_POINT is on the curve or not. Note that the return
849 * value for this function should NOT be treated as a boolean. Return values:
850 * 1: The point is on the curve
851 * 0: The point is not on the curve
852 * -1: An error occurred
854 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
857 if (group->meth->is_on_curve == 0) {
858 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
861 if (!ec_point_is_compat(point, group)) {
862 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
865 return group->meth->is_on_curve(group, point, ctx);
868 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
871 if (group->meth->point_cmp == 0) {
872 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
875 if (!ec_point_is_compat(a, group) || !ec_point_is_compat(b, group)) {
876 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
879 return group->meth->point_cmp(group, a, b, ctx);
882 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
884 if (group->meth->make_affine == 0) {
885 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
888 if (!ec_point_is_compat(point, group)) {
889 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
892 return group->meth->make_affine(group, point, ctx);
895 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
896 EC_POINT *points[], BN_CTX *ctx)
900 if (group->meth->points_make_affine == 0) {
901 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
904 for (i = 0; i < num; i++) {
905 if (!ec_point_is_compat(points[i], group)) {
906 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
910 return group->meth->points_make_affine(group, num, points, ctx);
914 * Functions for point multiplication. If group->meth->mul is 0, we use the
915 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
919 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
920 size_t num, const EC_POINT *points[],
921 const BIGNUM *scalars[], BN_CTX *ctx)
923 if (group->meth->mul == 0)
925 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
927 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
930 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
931 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
933 /* just a convenient interface to EC_POINTs_mul() */
935 const EC_POINT *points[1];
936 const BIGNUM *scalars[1];
939 scalars[0] = p_scalar;
941 return EC_POINTs_mul(group, r, g_scalar,
943 && p_scalar != NULL), points, scalars, ctx);
946 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
948 if (group->meth->mul == 0)
950 return ec_wNAF_precompute_mult(group, ctx);
952 if (group->meth->precompute_mult != 0)
953 return group->meth->precompute_mult(group, ctx);
955 return 1; /* nothing to do, so report success */
958 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
960 if (group->meth->mul == 0)
962 return ec_wNAF_have_precompute_mult(group);
964 if (group->meth->have_precompute_mult != 0)
965 return group->meth->have_precompute_mult(group);
967 return 0; /* cannot tell whether precomputation has
972 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
973 * returns one on success. On error it returns zero.
975 int ec_precompute_mont_data(EC_GROUP *group)
977 BN_CTX *ctx = BN_CTX_new();
980 BN_MONT_CTX_free(group->mont_data);
981 group->mont_data = NULL;
986 group->mont_data = BN_MONT_CTX_new();
987 if (group->mont_data == NULL)
990 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
991 BN_MONT_CTX_free(group->mont_data);
992 group->mont_data = NULL;
1004 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
1006 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
1009 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
1011 return CRYPTO_get_ex_data(&key->ex_data, idx);
1014 int ec_group_simple_order_bits(const EC_GROUP *group)
1016 if (group->order == NULL)
1018 return BN_num_bits(group->order);
1022 * Coordinate blinding for EC_POINT.
1024 * The underlying EC_METHOD can optionally implement this function:
1025 * underlying implementations should return 0 on errors, or 1 on
1028 * This wrapper returns 1 in case the underlying EC_METHOD does not
1029 * support coordinate blinding.
1031 int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx)
1033 if (group->meth->blind_coordinates == NULL)
1034 return 1; /* ignore if not implemented */
1036 return group->meth->blind_coordinates(group, p, ctx);