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 if ((dest->seed = OPENSSL_malloc(src->seed_len)) == NULL) {
217 ECerr(EC_F_EC_GROUP_COPY, ERR_R_MALLOC_FAILURE);
220 if (!memcpy(dest->seed, src->seed, src->seed_len))
222 dest->seed_len = src->seed_len;
224 OPENSSL_free(dest->seed);
229 return dest->meth->group_copy(dest, src);
232 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
240 if ((t = EC_GROUP_new(a->meth)) == NULL)
242 if (!EC_GROUP_copy(t, a))
255 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
260 int EC_METHOD_get_field_type(const EC_METHOD *meth)
262 return meth->field_type;
265 static int ec_precompute_mont_data(EC_GROUP *);
267 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
268 const BIGNUM *order, const BIGNUM *cofactor)
270 if (generator == NULL) {
271 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
275 if (group->generator == NULL) {
276 group->generator = EC_POINT_new(group);
277 if (group->generator == NULL)
280 if (!EC_POINT_copy(group->generator, generator))
284 if (!BN_copy(group->order, order))
287 BN_zero(group->order);
289 if (cofactor != NULL) {
290 if (!BN_copy(group->cofactor, cofactor))
293 BN_zero(group->cofactor);
296 * Some groups have an order with
297 * factors of two, which makes the Montgomery setup fail.
298 * |group->mont_data| will be NULL in this case.
300 if (BN_is_odd(group->order)) {
301 return ec_precompute_mont_data(group);
304 BN_MONT_CTX_free(group->mont_data);
305 group->mont_data = NULL;
309 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
311 return group->generator;
314 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
316 return group->mont_data;
319 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
321 if (group->order == NULL)
323 if (!BN_copy(order, group->order))
326 return !BN_is_zero(order);
329 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
334 int EC_GROUP_order_bits(const EC_GROUP *group)
336 return group->meth->group_order_bits(group);
339 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
343 if (group->cofactor == NULL)
345 if (!BN_copy(cofactor, group->cofactor))
348 return !BN_is_zero(group->cofactor);
351 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
353 return group->cofactor;
356 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
358 group->curve_name = nid;
361 int EC_GROUP_get_curve_name(const EC_GROUP *group)
363 return group->curve_name;
366 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
368 group->asn1_flag = flag;
371 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
373 return group->asn1_flag;
376 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
377 point_conversion_form_t form)
379 group->asn1_form = form;
382 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
385 return group->asn1_form;
388 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
390 OPENSSL_free(group->seed);
397 if ((group->seed = OPENSSL_malloc(len)) == NULL) {
398 ECerr(EC_F_EC_GROUP_SET_SEED, ERR_R_MALLOC_FAILURE);
401 memcpy(group->seed, p, len);
402 group->seed_len = len;
407 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
412 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
414 return group->seed_len;
417 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
418 const BIGNUM *b, BN_CTX *ctx)
420 if (group->meth->group_set_curve == 0) {
421 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
424 return group->meth->group_set_curve(group, p, a, b, ctx);
427 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
428 BIGNUM *b, BN_CTX *ctx)
430 if (group->meth->group_get_curve == 0) {
431 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
434 return group->meth->group_get_curve(group, p, a, b, ctx);
437 #ifndef OPENSSL_NO_EC2M
438 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
439 const BIGNUM *b, BN_CTX *ctx)
441 if (group->meth->group_set_curve == 0) {
442 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
443 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
446 return group->meth->group_set_curve(group, p, a, b, ctx);
449 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
450 BIGNUM *b, BN_CTX *ctx)
452 if (group->meth->group_get_curve == 0) {
453 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
454 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
457 return group->meth->group_get_curve(group, p, a, b, ctx);
461 int EC_GROUP_get_degree(const EC_GROUP *group)
463 if (group->meth->group_get_degree == 0) {
464 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
467 return group->meth->group_get_degree(group);
470 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
472 if (group->meth->group_check_discriminant == 0) {
473 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
474 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
477 return group->meth->group_check_discriminant(group, ctx);
480 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
483 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
484 BN_CTX *ctx_new = NULL;
486 /* compare the field types */
487 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
488 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
490 /* compare the curve name (if present in both) */
491 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
492 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
494 if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
498 ctx_new = ctx = BN_CTX_new();
503 a1 = BN_CTX_get(ctx);
504 a2 = BN_CTX_get(ctx);
505 a3 = BN_CTX_get(ctx);
506 b1 = BN_CTX_get(ctx);
507 b2 = BN_CTX_get(ctx);
508 b3 = BN_CTX_get(ctx);
511 BN_CTX_free(ctx_new);
516 * XXX This approach assumes that the external representation of curves
517 * over the same field type is the same.
519 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
520 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
523 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
526 /* XXX EC_POINT_cmp() assumes that the methods are equal */
527 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
528 EC_GROUP_get0_generator(b), ctx))
532 const BIGNUM *ao, *bo, *ac, *bc;
533 /* compare the order and cofactor */
534 ao = EC_GROUP_get0_order(a);
535 bo = EC_GROUP_get0_order(b);
536 ac = EC_GROUP_get0_cofactor(a);
537 bc = EC_GROUP_get0_cofactor(b);
538 if (ao == NULL || bo == NULL) {
540 BN_CTX_free(ctx_new);
543 if (BN_cmp(ao, bo) || BN_cmp(ac, bc))
548 BN_CTX_free(ctx_new);
553 /* functions for EC_POINT objects */
555 EC_POINT *EC_POINT_new(const EC_GROUP *group)
560 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
563 if (group->meth->point_init == NULL) {
564 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
568 ret = OPENSSL_zalloc(sizeof(*ret));
570 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
574 ret->meth = group->meth;
576 if (!ret->meth->point_init(ret)) {
584 void EC_POINT_free(EC_POINT *point)
589 if (point->meth->point_finish != 0)
590 point->meth->point_finish(point);
594 void EC_POINT_clear_free(EC_POINT *point)
599 if (point->meth->point_clear_finish != 0)
600 point->meth->point_clear_finish(point);
601 else if (point->meth->point_finish != 0)
602 point->meth->point_finish(point);
603 OPENSSL_clear_free(point, sizeof(*point));
606 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
608 if (dest->meth->point_copy == 0) {
609 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
612 if (dest->meth != src->meth) {
613 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
618 return dest->meth->point_copy(dest, src);
621 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
629 t = EC_POINT_new(group);
632 r = EC_POINT_copy(t, a);
640 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
645 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
647 if (group->meth->point_set_to_infinity == 0) {
648 ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
649 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
652 if (group->meth != point->meth) {
653 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
656 return group->meth->point_set_to_infinity(group, point);
659 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
660 EC_POINT *point, const BIGNUM *x,
661 const BIGNUM *y, const BIGNUM *z,
664 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
665 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
666 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
669 if (group->meth != point->meth) {
670 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
671 EC_R_INCOMPATIBLE_OBJECTS);
674 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
678 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
679 const EC_POINT *point, BIGNUM *x,
680 BIGNUM *y, BIGNUM *z,
683 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
684 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
685 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
688 if (group->meth != point->meth) {
689 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
690 EC_R_INCOMPATIBLE_OBJECTS);
693 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
697 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
698 EC_POINT *point, const BIGNUM *x,
699 const BIGNUM *y, BN_CTX *ctx)
701 if (group->meth->point_set_affine_coordinates == 0) {
702 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
703 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
706 if (group->meth != point->meth) {
707 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
708 EC_R_INCOMPATIBLE_OBJECTS);
711 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
714 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
715 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
716 EC_R_POINT_IS_NOT_ON_CURVE);
722 #ifndef OPENSSL_NO_EC2M
723 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
724 EC_POINT *point, const BIGNUM *x,
725 const BIGNUM *y, BN_CTX *ctx)
727 if (group->meth->point_set_affine_coordinates == 0) {
728 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
729 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
732 if (group->meth != point->meth) {
733 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
734 EC_R_INCOMPATIBLE_OBJECTS);
737 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
740 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
741 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
742 EC_R_POINT_IS_NOT_ON_CURVE);
749 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
750 const EC_POINT *point, BIGNUM *x,
751 BIGNUM *y, BN_CTX *ctx)
753 if (group->meth->point_get_affine_coordinates == 0) {
754 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
755 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
758 if (group->meth != point->meth) {
759 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
760 EC_R_INCOMPATIBLE_OBJECTS);
763 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
766 #ifndef OPENSSL_NO_EC2M
767 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
768 const EC_POINT *point, BIGNUM *x,
769 BIGNUM *y, BN_CTX *ctx)
771 if (group->meth->point_get_affine_coordinates == 0) {
772 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
773 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
776 if (group->meth != point->meth) {
777 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
778 EC_R_INCOMPATIBLE_OBJECTS);
781 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
785 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
786 const EC_POINT *b, BN_CTX *ctx)
788 if (group->meth->add == 0) {
789 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
792 if ((group->meth != r->meth) || (r->meth != a->meth)
793 || (a->meth != b->meth)) {
794 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
797 return group->meth->add(group, r, a, b, ctx);
800 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
803 if (group->meth->dbl == 0) {
804 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
807 if ((group->meth != r->meth) || (r->meth != a->meth)) {
808 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
811 return group->meth->dbl(group, r, a, ctx);
814 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
816 if (group->meth->invert == 0) {
817 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
820 if (group->meth != a->meth) {
821 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
824 return group->meth->invert(group, a, ctx);
827 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
829 if (group->meth->is_at_infinity == 0) {
830 ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
831 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
834 if (group->meth != point->meth) {
835 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
838 return group->meth->is_at_infinity(group, point);
842 * Check whether an EC_POINT is on the curve or not. Note that the return
843 * value for this function should NOT be treated as a boolean. Return values:
844 * 1: The point is on the curve
845 * 0: The point is not on the curve
846 * -1: An error occurred
848 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
851 if (group->meth->is_on_curve == 0) {
852 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
855 if (group->meth != point->meth) {
856 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
859 return group->meth->is_on_curve(group, point, ctx);
862 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
865 if (group->meth->point_cmp == 0) {
866 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
869 if ((group->meth != a->meth) || (a->meth != b->meth)) {
870 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
873 return group->meth->point_cmp(group, a, b, ctx);
876 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
878 if (group->meth->make_affine == 0) {
879 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
882 if (group->meth != point->meth) {
883 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
886 return group->meth->make_affine(group, point, ctx);
889 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
890 EC_POINT *points[], BN_CTX *ctx)
894 if (group->meth->points_make_affine == 0) {
895 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
898 for (i = 0; i < num; i++) {
899 if (group->meth != points[i]->meth) {
900 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
904 return group->meth->points_make_affine(group, num, points, ctx);
908 * Functions for point multiplication. If group->meth->mul is 0, we use the
909 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
913 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
914 size_t num, const EC_POINT *points[],
915 const BIGNUM *scalars[], BN_CTX *ctx)
917 if (group->meth->mul == 0)
919 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
921 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
924 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
925 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
927 /* just a convenient interface to EC_POINTs_mul() */
929 const EC_POINT *points[1];
930 const BIGNUM *scalars[1];
933 scalars[0] = p_scalar;
935 return EC_POINTs_mul(group, r, g_scalar,
937 && p_scalar != NULL), points, scalars, ctx);
940 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
942 if (group->meth->mul == 0)
944 return ec_wNAF_precompute_mult(group, ctx);
946 if (group->meth->precompute_mult != 0)
947 return group->meth->precompute_mult(group, ctx);
949 return 1; /* nothing to do, so report success */
952 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
954 if (group->meth->mul == 0)
956 return ec_wNAF_have_precompute_mult(group);
958 if (group->meth->have_precompute_mult != 0)
959 return group->meth->have_precompute_mult(group);
961 return 0; /* cannot tell whether precomputation has
966 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
967 * returns one on success. On error it returns zero.
969 static int ec_precompute_mont_data(EC_GROUP *group)
971 BN_CTX *ctx = BN_CTX_new();
974 BN_MONT_CTX_free(group->mont_data);
975 group->mont_data = NULL;
980 group->mont_data = BN_MONT_CTX_new();
981 if (group->mont_data == NULL)
984 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
985 BN_MONT_CTX_free(group->mont_data);
986 group->mont_data = NULL;
998 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
1000 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
1003 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
1005 return CRYPTO_get_ex_data(&key->ex_data, idx);
1008 int ec_group_simple_order_bits(const EC_GROUP *group)
1010 if (group->order == NULL)
1012 return BN_num_bits(group->order);
1015 int EC_GROUP_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
1016 BIGNUM *x, BN_CTX *ctx)
1018 if (group->meth->field_inverse_mod_ord != NULL)
1019 return group->meth->field_inverse_mod_ord(group, res, x, ctx);