2 * Copyright 2001-2016 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 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
265 const BIGNUM *order, const BIGNUM *cofactor)
267 if (generator == NULL) {
268 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
272 if (group->generator == NULL) {
273 group->generator = EC_POINT_new(group);
274 if (group->generator == NULL)
277 if (!EC_POINT_copy(group->generator, generator))
281 if (!BN_copy(group->order, order))
284 BN_zero(group->order);
286 if (cofactor != NULL) {
287 if (!BN_copy(group->cofactor, cofactor))
290 BN_zero(group->cofactor);
293 * Some groups have an order with
294 * factors of two, which makes the Montgomery setup fail.
295 * |group->mont_data| will be NULL in this case.
297 if (BN_is_odd(group->order)) {
298 return ec_precompute_mont_data(group);
301 BN_MONT_CTX_free(group->mont_data);
302 group->mont_data = NULL;
306 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
308 return group->generator;
311 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
313 return group->mont_data;
316 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
318 if (group->order == NULL)
320 if (!BN_copy(order, group->order))
323 return !BN_is_zero(order);
326 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
331 int EC_GROUP_order_bits(const EC_GROUP *group)
333 return group->meth->group_order_bits(group);
336 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
340 if (group->cofactor == NULL)
342 if (!BN_copy(cofactor, group->cofactor))
345 return !BN_is_zero(group->cofactor);
348 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
350 return group->cofactor;
353 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
355 group->curve_name = nid;
358 int EC_GROUP_get_curve_name(const EC_GROUP *group)
360 return group->curve_name;
363 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
365 group->asn1_flag = flag;
368 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
370 return group->asn1_flag;
373 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
374 point_conversion_form_t form)
376 group->asn1_form = form;
379 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
382 return group->asn1_form;
385 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
387 OPENSSL_free(group->seed);
394 if ((group->seed = OPENSSL_malloc(len)) == NULL)
396 memcpy(group->seed, p, len);
397 group->seed_len = len;
402 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
407 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
409 return group->seed_len;
412 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
413 const BIGNUM *b, BN_CTX *ctx)
415 if (group->meth->group_set_curve == 0) {
416 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
419 return group->meth->group_set_curve(group, p, a, b, ctx);
422 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
423 BIGNUM *b, BN_CTX *ctx)
425 if (group->meth->group_get_curve == 0) {
426 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
429 return group->meth->group_get_curve(group, p, a, b, ctx);
432 #ifndef OPENSSL_NO_EC2M
433 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
434 const BIGNUM *b, BN_CTX *ctx)
436 if (group->meth->group_set_curve == 0) {
437 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
438 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
441 return group->meth->group_set_curve(group, p, a, b, ctx);
444 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
445 BIGNUM *b, BN_CTX *ctx)
447 if (group->meth->group_get_curve == 0) {
448 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
449 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
452 return group->meth->group_get_curve(group, p, a, b, ctx);
456 int EC_GROUP_get_degree(const EC_GROUP *group)
458 if (group->meth->group_get_degree == 0) {
459 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
462 return group->meth->group_get_degree(group);
465 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
467 if (group->meth->group_check_discriminant == 0) {
468 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
469 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
472 return group->meth->group_check_discriminant(group, ctx);
475 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
478 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
479 BN_CTX *ctx_new = NULL;
481 /* compare the field types */
482 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
483 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
485 /* compare the curve name (if present in both) */
486 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
487 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
489 if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
493 ctx_new = ctx = BN_CTX_new();
498 a1 = BN_CTX_get(ctx);
499 a2 = BN_CTX_get(ctx);
500 a3 = BN_CTX_get(ctx);
501 b1 = BN_CTX_get(ctx);
502 b2 = BN_CTX_get(ctx);
503 b3 = BN_CTX_get(ctx);
506 BN_CTX_free(ctx_new);
511 * XXX This approach assumes that the external representation of curves
512 * over the same field type is the same.
514 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
515 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
518 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
521 /* XXX EC_POINT_cmp() assumes that the methods are equal */
522 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
523 EC_GROUP_get0_generator(b), ctx))
527 const BIGNUM *ao, *bo, *ac, *bc;
528 /* compare the order and cofactor */
529 ao = EC_GROUP_get0_order(a);
530 bo = EC_GROUP_get0_order(b);
531 ac = EC_GROUP_get0_cofactor(a);
532 bc = EC_GROUP_get0_cofactor(b);
533 if (ao == NULL || bo == NULL) {
535 BN_CTX_free(ctx_new);
538 if (BN_cmp(ao, bo) || BN_cmp(ac, bc))
543 BN_CTX_free(ctx_new);
548 /* functions for EC_POINT objects */
550 EC_POINT *EC_POINT_new(const EC_GROUP *group)
555 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
558 if (group->meth->point_init == 0) {
559 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
563 ret = OPENSSL_zalloc(sizeof(*ret));
565 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
569 ret->meth = group->meth;
571 if (!ret->meth->point_init(ret)) {
579 void EC_POINT_free(EC_POINT *point)
584 if (point->meth->point_finish != 0)
585 point->meth->point_finish(point);
589 void EC_POINT_clear_free(EC_POINT *point)
594 if (point->meth->point_clear_finish != 0)
595 point->meth->point_clear_finish(point);
596 else if (point->meth->point_finish != 0)
597 point->meth->point_finish(point);
598 OPENSSL_clear_free(point, sizeof(*point));
601 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
603 if (dest->meth->point_copy == 0) {
604 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
607 if (dest->meth != src->meth) {
608 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
613 return dest->meth->point_copy(dest, src);
616 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
624 t = EC_POINT_new(group);
627 r = EC_POINT_copy(t, a);
635 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
640 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
642 if (group->meth->point_set_to_infinity == 0) {
643 ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
644 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
647 if (group->meth != point->meth) {
648 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
651 return group->meth->point_set_to_infinity(group, point);
654 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
655 EC_POINT *point, const BIGNUM *x,
656 const BIGNUM *y, const BIGNUM *z,
659 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
660 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
661 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
664 if (group->meth != point->meth) {
665 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
666 EC_R_INCOMPATIBLE_OBJECTS);
669 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
673 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
674 const EC_POINT *point, BIGNUM *x,
675 BIGNUM *y, BIGNUM *z,
678 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
679 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
680 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
683 if (group->meth != point->meth) {
684 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
685 EC_R_INCOMPATIBLE_OBJECTS);
688 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
692 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
693 EC_POINT *point, const BIGNUM *x,
694 const BIGNUM *y, BN_CTX *ctx)
696 if (group->meth->point_set_affine_coordinates == 0) {
697 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
698 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
701 if (group->meth != point->meth) {
702 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
703 EC_R_INCOMPATIBLE_OBJECTS);
706 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
709 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
710 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
711 EC_R_POINT_IS_NOT_ON_CURVE);
717 #ifndef OPENSSL_NO_EC2M
718 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
719 EC_POINT *point, const BIGNUM *x,
720 const BIGNUM *y, BN_CTX *ctx)
722 if (group->meth->point_set_affine_coordinates == 0) {
723 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
724 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
727 if (group->meth != point->meth) {
728 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
729 EC_R_INCOMPATIBLE_OBJECTS);
732 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
735 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
736 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M,
737 EC_R_POINT_IS_NOT_ON_CURVE);
744 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
745 const EC_POINT *point, BIGNUM *x,
746 BIGNUM *y, BN_CTX *ctx)
748 if (group->meth->point_get_affine_coordinates == 0) {
749 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
750 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
753 if (group->meth != point->meth) {
754 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
755 EC_R_INCOMPATIBLE_OBJECTS);
758 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
761 #ifndef OPENSSL_NO_EC2M
762 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
763 const EC_POINT *point, BIGNUM *x,
764 BIGNUM *y, BN_CTX *ctx)
766 if (group->meth->point_get_affine_coordinates == 0) {
767 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
768 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
771 if (group->meth != point->meth) {
772 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
773 EC_R_INCOMPATIBLE_OBJECTS);
776 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
780 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
781 const EC_POINT *b, BN_CTX *ctx)
783 if (group->meth->add == 0) {
784 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
787 if ((group->meth != r->meth) || (r->meth != a->meth)
788 || (a->meth != b->meth)) {
789 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
792 return group->meth->add(group, r, a, b, ctx);
795 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
798 if (group->meth->dbl == 0) {
799 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
802 if ((group->meth != r->meth) || (r->meth != a->meth)) {
803 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
806 return group->meth->dbl(group, r, a, ctx);
809 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
811 if (group->meth->invert == 0) {
812 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
815 if (group->meth != a->meth) {
816 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
819 return group->meth->invert(group, a, ctx);
822 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
824 if (group->meth->is_at_infinity == 0) {
825 ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
826 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
829 if (group->meth != point->meth) {
830 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
833 return group->meth->is_at_infinity(group, point);
837 * Check whether an EC_POINT is on the curve or not. Note that the return
838 * value for this function should NOT be treated as a boolean. Return values:
839 * 1: The point is on the curve
840 * 0: The point is not on the curve
841 * -1: An error occurred
843 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
846 if (group->meth->is_on_curve == 0) {
847 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
850 if (group->meth != point->meth) {
851 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
854 return group->meth->is_on_curve(group, point, ctx);
857 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
860 if (group->meth->point_cmp == 0) {
861 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
864 if ((group->meth != a->meth) || (a->meth != b->meth)) {
865 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
868 return group->meth->point_cmp(group, a, b, ctx);
871 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
873 if (group->meth->make_affine == 0) {
874 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
877 if (group->meth != point->meth) {
878 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
881 return group->meth->make_affine(group, point, ctx);
884 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
885 EC_POINT *points[], BN_CTX *ctx)
889 if (group->meth->points_make_affine == 0) {
890 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
893 for (i = 0; i < num; i++) {
894 if (group->meth != points[i]->meth) {
895 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
899 return group->meth->points_make_affine(group, num, points, ctx);
903 * Functions for point multiplication. If group->meth->mul is 0, we use the
904 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
908 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
909 size_t num, const EC_POINT *points[],
910 const BIGNUM *scalars[], BN_CTX *ctx)
912 if (group->meth->mul == 0)
914 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
916 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
919 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
920 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
922 /* just a convenient interface to EC_POINTs_mul() */
924 const EC_POINT *points[1];
925 const BIGNUM *scalars[1];
928 scalars[0] = p_scalar;
930 return EC_POINTs_mul(group, r, g_scalar,
932 && p_scalar != NULL), points, scalars, ctx);
935 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
937 if (group->meth->mul == 0)
939 return ec_wNAF_precompute_mult(group, ctx);
941 if (group->meth->precompute_mult != 0)
942 return group->meth->precompute_mult(group, ctx);
944 return 1; /* nothing to do, so report success */
947 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
949 if (group->meth->mul == 0)
951 return ec_wNAF_have_precompute_mult(group);
953 if (group->meth->have_precompute_mult != 0)
954 return group->meth->have_precompute_mult(group);
956 return 0; /* cannot tell whether precomputation has
961 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
962 * returns one on success. On error it returns zero.
964 int ec_precompute_mont_data(EC_GROUP *group)
966 BN_CTX *ctx = BN_CTX_new();
969 BN_MONT_CTX_free(group->mont_data);
970 group->mont_data = NULL;
975 group->mont_data = BN_MONT_CTX_new();
976 if (group->mont_data == NULL)
979 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
980 BN_MONT_CTX_free(group->mont_data);
981 group->mont_data = NULL;
993 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
995 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
998 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
1000 return CRYPTO_get_ex_data(&key->ex_data, idx);
1003 int ec_group_simple_order_bits(const EC_GROUP *group)
1005 if (group->order == NULL)
1007 return BN_num_bits(group->order);