1 /* crypto/ec/ec_lib.c */
3 * Originally written by Bodo Moeller for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * openssl-core@openssl.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
58 /* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60 * Binary polynomial ECC support in OpenSSL originally developed by
61 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
66 #include <openssl/err.h>
67 #include <openssl/opensslv.h>
71 static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
74 /* functions for EC_GROUP objects */
76 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
82 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
85 if (meth->group_init == 0)
87 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
91 ret = OPENSSL_malloc(sizeof *ret);
94 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
100 ret->extra_data = NULL;
102 ret->generator = NULL;
103 BN_init(&ret->order);
104 BN_init(&ret->cofactor);
108 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
113 if (!meth->group_init(ret))
123 void EC_GROUP_free(EC_GROUP *group)
127 if (group->meth->group_finish != 0)
128 group->meth->group_finish(group);
130 EC_EX_DATA_free_all_data(&group->extra_data);
132 if (group->generator != NULL)
133 EC_POINT_free(group->generator);
134 BN_free(&group->order);
135 BN_free(&group->cofactor);
138 OPENSSL_free(group->seed);
144 void EC_GROUP_clear_free(EC_GROUP *group)
148 if (group->meth->group_clear_finish != 0)
149 group->meth->group_clear_finish(group);
150 else if (group->meth->group_finish != 0)
151 group->meth->group_finish(group);
153 EC_EX_DATA_clear_free_all_data(&group->extra_data);
155 if (group->generator != NULL)
156 EC_POINT_clear_free(group->generator);
157 BN_clear_free(&group->order);
158 BN_clear_free(&group->cofactor);
162 OPENSSL_cleanse(group->seed, group->seed_len);
163 OPENSSL_free(group->seed);
166 OPENSSL_cleanse(group, sizeof *group);
171 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
175 if (dest->meth->group_copy == 0)
177 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
180 if (dest->meth != src->meth)
182 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
188 EC_EX_DATA_free_all_data(&dest->extra_data);
190 for (d = src->extra_data; d != NULL; d = d->next)
192 void *t = d->dup_func(d->data);
196 if (!EC_EX_DATA_set_data(&dest->extra_data, t, d->dup_func, d->free_func, d->clear_free_func))
200 if (src->generator != NULL)
202 if (dest->generator == NULL)
204 dest->generator = EC_POINT_new(dest);
205 if (dest->generator == NULL) return 0;
207 if (!EC_POINT_copy(dest->generator, src->generator)) return 0;
211 /* src->generator == NULL */
212 if (dest->generator != NULL)
214 EC_POINT_clear_free(dest->generator);
215 dest->generator = NULL;
219 if (!BN_copy(&dest->order, &src->order)) return 0;
220 if (!BN_copy(&dest->cofactor, &src->cofactor)) return 0;
222 dest->curve_name = src->curve_name;
223 dest->asn1_flag = src->asn1_flag;
224 dest->asn1_form = src->asn1_form;
229 OPENSSL_free(dest->seed);
230 dest->seed = OPENSSL_malloc(src->seed_len);
231 if (dest->seed == NULL)
233 if (!memcpy(dest->seed, src->seed, src->seed_len))
235 dest->seed_len = src->seed_len;
240 OPENSSL_free(dest->seed);
246 return dest->meth->group_copy(dest, src);
250 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
255 if (a == NULL) return NULL;
257 if ((t = EC_GROUP_new(a->meth)) == NULL) return(NULL);
258 if (!EC_GROUP_copy(t, a)) goto err;
265 if (t) EC_GROUP_free(t);
272 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
278 int EC_METHOD_get_field_type(const EC_METHOD *meth)
280 return meth->field_type;
284 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
286 if (generator == NULL)
288 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
292 if (group->generator == NULL)
294 group->generator = EC_POINT_new(group);
295 if (group->generator == NULL) return 0;
297 if (!EC_POINT_copy(group->generator, generator)) return 0;
300 { if (!BN_copy(&group->order, order)) return 0; }
302 BN_zero(&group->order);
304 if (cofactor != NULL)
305 { if (!BN_copy(&group->cofactor, cofactor)) return 0; }
307 BN_zero(&group->cofactor);
313 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
315 return group->generator;
319 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
321 if (!BN_copy(order, &group->order))
324 return !BN_is_zero(order);
328 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
330 if (!BN_copy(cofactor, &group->cofactor))
333 return !BN_is_zero(&group->cofactor);
337 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
339 group->curve_name = nid;
343 int EC_GROUP_get_curve_name(const EC_GROUP *group)
345 return group->curve_name;
349 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
351 group->asn1_flag = flag;
355 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
357 return group->asn1_flag;
361 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
362 point_conversion_form_t form)
364 group->asn1_form = form;
368 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *group)
370 return group->asn1_form;
374 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
378 OPENSSL_free(group->seed);
386 if ((group->seed = OPENSSL_malloc(len)) == NULL)
388 memcpy(group->seed, p, len);
389 group->seed_len = len;
395 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
401 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
403 return group->seed_len;
407 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
409 if (group->meth->group_set_curve == 0)
411 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
414 return group->meth->group_set_curve(group, p, a, b, ctx);
418 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
420 if (group->meth->group_get_curve == 0)
422 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
425 return group->meth->group_get_curve(group, p, a, b, ctx);
428 #ifndef OPENSSL_NO_EC2M
429 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
431 if (group->meth->group_set_curve == 0)
433 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
436 return group->meth->group_set_curve(group, p, a, b, ctx);
440 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
442 if (group->meth->group_get_curve == 0)
444 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
447 return group->meth->group_get_curve(group, p, a, b, ctx);
451 int EC_GROUP_get_degree(const EC_GROUP *group)
453 if (group->meth->group_get_degree == 0)
455 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
458 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)
466 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
469 return group->meth->group_check_discriminant(group, ctx);
473 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
476 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
477 BN_CTX *ctx_new = NULL;
479 /* compare the field types*/
480 if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
481 EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
483 /* compare the curve name (if present) */
484 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
485 EC_GROUP_get_curve_name(a) == EC_GROUP_get_curve_name(b))
489 ctx_new = ctx = BN_CTX_new();
494 a1 = BN_CTX_get(ctx);
495 a2 = BN_CTX_get(ctx);
496 a3 = BN_CTX_get(ctx);
497 b1 = BN_CTX_get(ctx);
498 b2 = BN_CTX_get(ctx);
499 b3 = BN_CTX_get(ctx);
508 /* XXX This approach assumes that the external representation
509 * of curves 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))
525 /* compare the order and cofactor */
526 if (!EC_GROUP_get_order(a, a1, ctx) ||
527 !EC_GROUP_get_order(b, b1, ctx) ||
528 !EC_GROUP_get_cofactor(a, a2, ctx) ||
529 !EC_GROUP_get_cofactor(b, b2, ctx))
536 if (BN_cmp(a1, b1) || BN_cmp(a2, b2))
548 /* this has 'package' visibility */
549 int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data,
550 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
557 for (d = *ex_data; d != NULL; d = d->next)
559 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
561 ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL);
567 /* no explicit entry needed */
570 d = OPENSSL_malloc(sizeof *d);
575 d->dup_func = dup_func;
576 d->free_func = free_func;
577 d->clear_free_func = clear_free_func;
585 /* this has 'package' visibility */
586 void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data,
587 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
589 const EC_EXTRA_DATA *d;
591 for (d = ex_data; d != NULL; d = d->next)
593 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
600 /* this has 'package' visibility */
601 void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data,
602 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
609 for (p = ex_data; *p != NULL; p = &((*p)->next))
611 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
613 EC_EXTRA_DATA *next = (*p)->next;
615 (*p)->free_func((*p)->data);
624 /* this has 'package' visibility */
625 void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data,
626 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
633 for (p = ex_data; *p != NULL; p = &((*p)->next))
635 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
637 EC_EXTRA_DATA *next = (*p)->next;
639 (*p)->clear_free_func((*p)->data);
648 /* this has 'package' visibility */
649 void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data)
659 EC_EXTRA_DATA *next = d->next;
661 d->free_func(d->data);
669 /* this has 'package' visibility */
670 void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data)
680 EC_EXTRA_DATA *next = d->next;
682 d->clear_free_func(d->data);
691 /* functions for EC_POINT objects */
693 EC_POINT *EC_POINT_new(const EC_GROUP *group)
699 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
702 if (group->meth->point_init == 0)
704 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
708 ret = OPENSSL_malloc(sizeof *ret);
711 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
715 ret->meth = group->meth;
717 if (!ret->meth->point_init(ret))
727 void EC_POINT_free(EC_POINT *point)
731 if (point->meth->point_finish != 0)
732 point->meth->point_finish(point);
737 void EC_POINT_clear_free(EC_POINT *point)
741 if (point->meth->point_clear_finish != 0)
742 point->meth->point_clear_finish(point);
743 else if (point->meth->point_finish != 0)
744 point->meth->point_finish(point);
745 OPENSSL_cleanse(point, sizeof *point);
750 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
752 if (dest->meth->point_copy == 0)
754 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
757 if (dest->meth != src->meth)
759 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
764 return dest->meth->point_copy(dest, src);
768 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
773 if (a == NULL) return NULL;
775 t = EC_POINT_new(group);
776 if (t == NULL) return(NULL);
777 r = EC_POINT_copy(t, a);
787 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
793 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
795 if (group->meth->point_set_to_infinity == 0)
797 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
800 if (group->meth != point->meth)
802 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
805 return group->meth->point_set_to_infinity(group, point);
809 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
810 const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
812 if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
814 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
817 if (group->meth != point->meth)
819 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
822 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
826 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
827 BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
829 if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
831 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
834 if (group->meth != point->meth)
836 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
839 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
843 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
844 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
846 if (group->meth->point_set_affine_coordinates == 0)
848 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
851 if (group->meth != point->meth)
853 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
856 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
859 #ifndef OPENSSL_NO_EC2M
860 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
861 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
863 if (group->meth->point_set_affine_coordinates == 0)
865 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
868 if (group->meth != point->meth)
870 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
873 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
877 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
878 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
880 if (group->meth->point_get_affine_coordinates == 0)
882 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
885 if (group->meth != point->meth)
887 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
890 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
893 #ifndef OPENSSL_NO_EC2M
894 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, const EC_POINT *point,
895 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
897 if (group->meth->point_get_affine_coordinates == 0)
899 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
902 if (group->meth != point->meth)
904 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
907 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
911 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
913 if (group->meth->add == 0)
915 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
918 if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
920 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
923 return group->meth->add(group, r, a, b, ctx);
927 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
929 if (group->meth->dbl == 0)
931 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
934 if ((group->meth != r->meth) || (r->meth != a->meth))
936 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
939 return group->meth->dbl(group, r, a, ctx);
943 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
945 if (group->meth->dbl == 0)
947 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
950 if (group->meth != a->meth)
952 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
955 return group->meth->invert(group, a, ctx);
959 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
961 if (group->meth->is_at_infinity == 0)
963 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
966 if (group->meth != point->meth)
968 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
971 return group->meth->is_at_infinity(group, point);
975 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
977 if (group->meth->is_on_curve == 0)
979 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
982 if (group->meth != point->meth)
984 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
987 return group->meth->is_on_curve(group, point, ctx);
991 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
993 if (group->meth->point_cmp == 0)
995 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
998 if ((group->meth != a->meth) || (a->meth != b->meth))
1000 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
1003 return group->meth->point_cmp(group, a, b, ctx);
1007 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
1009 if (group->meth->make_affine == 0)
1011 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1014 if (group->meth != point->meth)
1016 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1019 return group->meth->make_affine(group, point, ctx);
1023 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
1027 if (group->meth->points_make_affine == 0)
1029 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1032 for (i = 0; i < num; i++)
1034 if (group->meth != points[i]->meth)
1036 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1040 return group->meth->points_make_affine(group, num, points, ctx);
1044 /* Functions for point multiplication.
1046 * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
1047 * otherwise we dispatch through methods.
1050 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
1051 size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
1053 if (group->meth->mul == 0)
1055 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
1057 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
1060 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
1061 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
1063 /* just a convenient interface to EC_POINTs_mul() */
1065 const EC_POINT *points[1];
1066 const BIGNUM *scalars[1];
1069 scalars[0] = p_scalar;
1071 return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
1074 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
1076 if (group->meth->mul == 0)
1078 return ec_wNAF_precompute_mult(group, ctx);
1080 if (group->meth->precompute_mult != 0)
1081 return group->meth->precompute_mult(group, ctx);
1083 return 1; /* nothing to do, so report success */
1086 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
1088 if (group->meth->mul == 0)
1090 return ec_wNAF_have_precompute_mult(group);
1092 if (group->meth->have_precompute_mult != 0)
1093 return group->meth->have_precompute_mult(group);
1095 return 0; /* cannot tell whether precomputation has been performed */