2 * Originally written by Bodo Moeller for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
57 /* ====================================================================
58 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
59 * Binary polynomial ECC support in OpenSSL originally developed by
60 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
65 #include <openssl/err.h>
66 #include <openssl/opensslv.h>
70 /* functions for EC_GROUP objects */
72 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
77 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
80 if (meth->group_init == 0) {
81 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
85 ret = OPENSSL_zalloc(sizeof(*ret));
87 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
92 ret->order = BN_new();
93 if (ret->order == NULL)
95 ret->cofactor = BN_new();
96 if (ret->cofactor == NULL)
98 ret->asn1_flag = OPENSSL_EC_NAMED_CURVE;
99 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
100 if (!meth->group_init(ret))
106 BN_free(ret->cofactor);
111 void EC_pre_comp_free(EC_GROUP *group)
113 switch (group->pre_comp_type) {
116 #ifdef ECP_NISTZ256_REFERENCE_IMPLEMENTATION
118 EC_nistz256_pre_comp_free(group->pre_comp.nistz256);
121 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
123 EC_nistp224_pre_comp_free(group->pre_comp.nistp224);
126 EC_nistp256_pre_comp_free(group->pre_comp.nistp256);
129 EC_nistp521_pre_comp_free(group->pre_comp.nistp521);
133 EC_ec_pre_comp_free(group->pre_comp.ec);
136 group->pre_comp.ec = NULL;
139 void EC_GROUP_free(EC_GROUP *group)
144 if (group->meth->group_finish != 0)
145 group->meth->group_finish(group);
147 EC_pre_comp_free(group);
148 BN_MONT_CTX_free(group->mont_data);
149 EC_POINT_free(group->generator);
150 BN_free(group->order);
151 BN_free(group->cofactor);
152 OPENSSL_free(group->seed);
156 void EC_GROUP_clear_free(EC_GROUP *group)
161 if (group->meth->group_clear_finish != 0)
162 group->meth->group_clear_finish(group);
163 else if (group->meth->group_finish != 0)
164 group->meth->group_finish(group);
166 EC_pre_comp_free(group);
167 BN_MONT_CTX_free(group->mont_data);
168 EC_POINT_clear_free(group->generator);
169 BN_clear_free(group->order);
170 BN_clear_free(group->cofactor);
171 OPENSSL_clear_free(group->seed, group->seed_len);
172 OPENSSL_clear_free(group, sizeof(*group));
175 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
177 if (dest->meth->group_copy == 0) {
178 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
181 if (dest->meth != src->meth) {
182 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
188 /* Copy precomputed */
189 dest->pre_comp_type = src->pre_comp_type;
190 switch (src->pre_comp_type) {
192 dest->pre_comp.ec = NULL;
194 #ifdef ECP_NISTZ256_REFERENCE_IMPLEMENTATION
196 dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256);
199 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
201 dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224);
204 dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256);
207 dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521);
211 dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec);
215 if (src->mont_data != NULL) {
216 if (dest->mont_data == NULL) {
217 dest->mont_data = BN_MONT_CTX_new();
218 if (dest->mont_data == NULL)
221 if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
224 /* src->generator == NULL */
225 BN_MONT_CTX_free(dest->mont_data);
226 dest->mont_data = NULL;
229 if (src->generator != NULL) {
230 if (dest->generator == NULL) {
231 dest->generator = EC_POINT_new(dest);
232 if (dest->generator == NULL)
235 if (!EC_POINT_copy(dest->generator, src->generator))
238 /* src->generator == NULL */
239 EC_POINT_clear_free(dest->generator);
240 dest->generator = NULL;
243 if (!BN_copy(dest->order, src->order))
245 if (!BN_copy(dest->cofactor, src->cofactor))
248 dest->curve_name = src->curve_name;
249 dest->asn1_flag = src->asn1_flag;
250 dest->asn1_form = src->asn1_form;
253 OPENSSL_free(dest->seed);
254 dest->seed = OPENSSL_malloc(src->seed_len);
255 if (dest->seed == NULL)
257 if (!memcpy(dest->seed, src->seed, src->seed_len))
259 dest->seed_len = src->seed_len;
261 OPENSSL_free(dest->seed);
266 return dest->meth->group_copy(dest, src);
269 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
277 if ((t = EC_GROUP_new(a->meth)) == NULL)
279 if (!EC_GROUP_copy(t, a))
292 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
297 int EC_METHOD_get_field_type(const EC_METHOD *meth)
299 return meth->field_type;
302 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
303 const BIGNUM *order, const BIGNUM *cofactor)
305 if (generator == NULL) {
306 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
310 if (group->generator == NULL) {
311 group->generator = EC_POINT_new(group);
312 if (group->generator == NULL)
315 if (!EC_POINT_copy(group->generator, generator))
319 if (!BN_copy(group->order, order))
322 BN_zero(group->order);
324 if (cofactor != NULL) {
325 if (!BN_copy(group->cofactor, cofactor))
328 BN_zero(group->cofactor);
331 * We ignore the return value because some groups have an order with
332 * factors of two, which makes the Montgomery setup fail.
333 * |group->mont_data| will be NULL in this case.
335 ec_precompute_mont_data(group);
340 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
342 return group->generator;
345 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
347 return group->mont_data;
350 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
352 if (!BN_copy(order, group->order))
355 return !BN_is_zero(order);
358 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
361 if (!BN_copy(cofactor, group->cofactor))
364 return !BN_is_zero(group->cofactor);
367 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
369 group->curve_name = nid;
372 int EC_GROUP_get_curve_name(const EC_GROUP *group)
374 return group->curve_name;
377 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
379 group->asn1_flag = flag;
382 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
384 return group->asn1_flag;
387 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
388 point_conversion_form_t form)
390 group->asn1_form = form;
393 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
396 return group->asn1_form;
399 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
401 OPENSSL_free(group->seed);
408 if ((group->seed = OPENSSL_malloc(len)) == NULL)
410 memcpy(group->seed, p, len);
411 group->seed_len = len;
416 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
421 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
423 return group->seed_len;
426 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
427 const BIGNUM *b, BN_CTX *ctx)
429 if (group->meth->group_set_curve == 0) {
430 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
433 return group->meth->group_set_curve(group, p, a, b, ctx);
436 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
437 BIGNUM *b, BN_CTX *ctx)
439 if (group->meth->group_get_curve == 0) {
440 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
443 return group->meth->group_get_curve(group, p, a, b, ctx);
446 #ifndef OPENSSL_NO_EC2M
447 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
448 const BIGNUM *b, BN_CTX *ctx)
450 if (group->meth->group_set_curve == 0) {
451 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M,
452 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
455 return group->meth->group_set_curve(group, p, a, b, ctx);
458 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
459 BIGNUM *b, BN_CTX *ctx)
461 if (group->meth->group_get_curve == 0) {
462 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M,
463 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
466 return group->meth->group_get_curve(group, p, a, b, ctx);
470 int EC_GROUP_get_degree(const EC_GROUP *group)
472 if (group->meth->group_get_degree == 0) {
473 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
476 return group->meth->group_get_degree(group);
479 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
481 if (group->meth->group_check_discriminant == 0) {
482 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
483 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
486 return group->meth->group_check_discriminant(group, ctx);
489 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
492 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
493 BN_CTX *ctx_new = NULL;
495 /* compare the field types */
496 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
497 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
499 /* compare the curve name (if present in both) */
500 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
501 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
505 ctx_new = ctx = BN_CTX_new();
510 a1 = BN_CTX_get(ctx);
511 a2 = BN_CTX_get(ctx);
512 a3 = BN_CTX_get(ctx);
513 b1 = BN_CTX_get(ctx);
514 b2 = BN_CTX_get(ctx);
515 b3 = BN_CTX_get(ctx);
518 BN_CTX_free(ctx_new);
523 * XXX This approach assumes that the external representation of curves
524 * over the same field type is the same.
526 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
527 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
530 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
533 /* XXX EC_POINT_cmp() assumes that the methods are equal */
534 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
535 EC_GROUP_get0_generator(b), ctx))
539 /* compare the order and cofactor */
540 if (!EC_GROUP_get_order(a, a1, ctx) ||
541 !EC_GROUP_get_order(b, b1, ctx) ||
542 !EC_GROUP_get_cofactor(a, a2, ctx) ||
543 !EC_GROUP_get_cofactor(b, b2, ctx)) {
545 BN_CTX_free(ctx_new);
548 if (BN_cmp(a1, b1) || BN_cmp(a2, b2))
553 BN_CTX_free(ctx_new);
558 /* functions for EC_POINT objects */
560 EC_POINT *EC_POINT_new(const EC_GROUP *group)
565 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
568 if (group->meth->point_init == 0) {
569 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
573 ret = OPENSSL_malloc(sizeof(*ret));
575 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
579 ret->meth = group->meth;
581 if (!ret->meth->point_init(ret)) {
589 void EC_POINT_free(EC_POINT *point)
594 if (point->meth->point_finish != 0)
595 point->meth->point_finish(point);
599 void EC_POINT_clear_free(EC_POINT *point)
604 if (point->meth->point_clear_finish != 0)
605 point->meth->point_clear_finish(point);
606 else if (point->meth->point_finish != 0)
607 point->meth->point_finish(point);
608 OPENSSL_clear_free(point, sizeof(*point));
611 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
613 if (dest->meth->point_copy == 0) {
614 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
617 if (dest->meth != src->meth) {
618 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
623 return dest->meth->point_copy(dest, src);
626 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
634 t = EC_POINT_new(group);
637 r = EC_POINT_copy(t, a);
645 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
650 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
652 if (group->meth->point_set_to_infinity == 0) {
653 ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
654 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
657 if (group->meth != point->meth) {
658 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
661 return group->meth->point_set_to_infinity(group, point);
664 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
665 EC_POINT *point, const BIGNUM *x,
666 const BIGNUM *y, const BIGNUM *z,
669 if (group->meth->point_set_Jprojective_coordinates_GFp == 0) {
670 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
671 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
674 if (group->meth != point->meth) {
675 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
676 EC_R_INCOMPATIBLE_OBJECTS);
679 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x,
683 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
684 const EC_POINT *point, BIGNUM *x,
685 BIGNUM *y, BIGNUM *z,
688 if (group->meth->point_get_Jprojective_coordinates_GFp == 0) {
689 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
690 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
693 if (group->meth != point->meth) {
694 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
695 EC_R_INCOMPATIBLE_OBJECTS);
698 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x,
702 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
703 EC_POINT *point, const BIGNUM *x,
704 const BIGNUM *y, BN_CTX *ctx)
706 if (group->meth->point_set_affine_coordinates == 0) {
707 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
708 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
711 if (group->meth != point->meth) {
712 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP,
713 EC_R_INCOMPATIBLE_OBJECTS);
716 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
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 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
738 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
739 const EC_POINT *point, BIGNUM *x,
740 BIGNUM *y, BN_CTX *ctx)
742 if (group->meth->point_get_affine_coordinates == 0) {
743 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
744 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
747 if (group->meth != point->meth) {
748 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP,
749 EC_R_INCOMPATIBLE_OBJECTS);
752 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
755 #ifndef OPENSSL_NO_EC2M
756 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
757 const EC_POINT *point, BIGNUM *x,
758 BIGNUM *y, BN_CTX *ctx)
760 if (group->meth->point_get_affine_coordinates == 0) {
761 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
762 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
765 if (group->meth != point->meth) {
766 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M,
767 EC_R_INCOMPATIBLE_OBJECTS);
770 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
774 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
775 const EC_POINT *b, BN_CTX *ctx)
777 if (group->meth->add == 0) {
778 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
781 if ((group->meth != r->meth) || (r->meth != a->meth)
782 || (a->meth != b->meth)) {
783 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
786 return group->meth->add(group, r, a, b, ctx);
789 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
792 if (group->meth->dbl == 0) {
793 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
796 if ((group->meth != r->meth) || (r->meth != a->meth)) {
797 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
800 return group->meth->dbl(group, r, a, ctx);
803 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
805 if (group->meth->invert == 0) {
806 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
809 if (group->meth != a->meth) {
810 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
813 return group->meth->invert(group, a, ctx);
816 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
818 if (group->meth->is_at_infinity == 0) {
819 ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
820 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
823 if (group->meth != point->meth) {
824 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
827 return group->meth->is_at_infinity(group, point);
831 * Check whether an EC_POINT is on the curve or not. Note that the return
832 * value for this function should NOT be treated as a boolean. Return values:
833 * 1: The point is on the curve
834 * 0: The point is not on the curve
835 * -1: An error occurred
837 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
840 if (group->meth->is_on_curve == 0) {
841 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
844 if (group->meth != point->meth) {
845 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
848 return group->meth->is_on_curve(group, point, ctx);
851 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
854 if (group->meth->point_cmp == 0) {
855 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
858 if ((group->meth != a->meth) || (a->meth != b->meth)) {
859 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
862 return group->meth->point_cmp(group, a, b, ctx);
865 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
867 if (group->meth->make_affine == 0) {
868 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
871 if (group->meth != point->meth) {
872 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
875 return group->meth->make_affine(group, point, ctx);
878 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
879 EC_POINT *points[], BN_CTX *ctx)
883 if (group->meth->points_make_affine == 0) {
884 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
887 for (i = 0; i < num; i++) {
888 if (group->meth != points[i]->meth) {
889 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
893 return group->meth->points_make_affine(group, num, points, ctx);
897 * Functions for point multiplication. If group->meth->mul is 0, we use the
898 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
902 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
903 size_t num, const EC_POINT *points[],
904 const BIGNUM *scalars[], BN_CTX *ctx)
906 if (group->meth->mul == 0)
908 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
910 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
913 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
914 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
916 /* just a convenient interface to EC_POINTs_mul() */
918 const EC_POINT *points[1];
919 const BIGNUM *scalars[1];
922 scalars[0] = p_scalar;
924 return EC_POINTs_mul(group, r, g_scalar,
926 && p_scalar != NULL), points, scalars, ctx);
929 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
931 if (group->meth->mul == 0)
933 return ec_wNAF_precompute_mult(group, ctx);
935 if (group->meth->precompute_mult != 0)
936 return group->meth->precompute_mult(group, ctx);
938 return 1; /* nothing to do, so report success */
941 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
943 if (group->meth->mul == 0)
945 return ec_wNAF_have_precompute_mult(group);
947 if (group->meth->have_precompute_mult != 0)
948 return group->meth->have_precompute_mult(group);
950 return 0; /* cannot tell whether precomputation has
955 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
956 * returns one on success. On error it returns zero.
958 int ec_precompute_mont_data(EC_GROUP *group)
960 BN_CTX *ctx = BN_CTX_new();
963 BN_MONT_CTX_free(group->mont_data);
964 group->mont_data = NULL;
969 group->mont_data = BN_MONT_CTX_new();
970 if (group->mont_data == NULL)
973 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
974 BN_MONT_CTX_free(group->mont_data);
975 group->mont_data = NULL;
987 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
989 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
992 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
994 return CRYPTO_get_ex_data(&key->ex_data, idx);