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.
64 #define OPENSSL_FIPSAPI
68 #include <openssl/err.h>
69 #include <openssl/opensslv.h>
73 static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
76 /* functions for EC_GROUP objects */
78 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
84 ECerr(EC_F_EC_GROUP_NEW, EC_R_SLOT_FULL);
87 if (meth->group_init == 0)
89 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
93 ret = OPENSSL_malloc(sizeof *ret);
96 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
102 ret->extra_data = NULL;
104 ret->generator = NULL;
105 BN_init(&ret->order);
106 BN_init(&ret->cofactor);
110 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
115 if (!meth->group_init(ret))
125 void EC_GROUP_free(EC_GROUP *group)
129 if (group->meth->group_finish != 0)
130 group->meth->group_finish(group);
132 EC_EX_DATA_free_all_data(&group->extra_data);
134 if (group->generator != NULL)
135 EC_POINT_free(group->generator);
136 BN_free(&group->order);
137 BN_free(&group->cofactor);
140 OPENSSL_free(group->seed);
146 void EC_GROUP_clear_free(EC_GROUP *group)
150 if (group->meth->group_clear_finish != 0)
151 group->meth->group_clear_finish(group);
152 else if (group->meth->group_finish != 0)
153 group->meth->group_finish(group);
155 EC_EX_DATA_clear_free_all_data(&group->extra_data);
157 if (group->generator != NULL)
158 EC_POINT_clear_free(group->generator);
159 BN_clear_free(&group->order);
160 BN_clear_free(&group->cofactor);
164 OPENSSL_cleanse(group->seed, group->seed_len);
165 OPENSSL_free(group->seed);
168 OPENSSL_cleanse(group, sizeof *group);
173 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
177 if (dest->meth->group_copy == 0)
179 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
182 if (dest->meth != src->meth)
184 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
190 EC_EX_DATA_free_all_data(&dest->extra_data);
192 for (d = src->extra_data; d != NULL; d = d->next)
194 void *t = d->dup_func(d->data);
198 if (!EC_EX_DATA_set_data(&dest->extra_data, t, d->dup_func, d->free_func, d->clear_free_func))
202 if (src->generator != NULL)
204 if (dest->generator == NULL)
206 dest->generator = EC_POINT_new(dest);
207 if (dest->generator == NULL) return 0;
209 if (!EC_POINT_copy(dest->generator, src->generator)) return 0;
213 /* src->generator == NULL */
214 if (dest->generator != NULL)
216 EC_POINT_clear_free(dest->generator);
217 dest->generator = NULL;
221 if (!BN_copy(&dest->order, &src->order)) return 0;
222 if (!BN_copy(&dest->cofactor, &src->cofactor)) return 0;
224 dest->curve_name = src->curve_name;
225 dest->asn1_flag = src->asn1_flag;
226 dest->asn1_form = src->asn1_form;
231 OPENSSL_free(dest->seed);
232 dest->seed = OPENSSL_malloc(src->seed_len);
233 if (dest->seed == NULL)
235 if (!memcpy(dest->seed, src->seed, src->seed_len))
237 dest->seed_len = src->seed_len;
242 OPENSSL_free(dest->seed);
248 return dest->meth->group_copy(dest, src);
252 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
257 if (a == NULL) return NULL;
259 if ((t = EC_GROUP_new(a->meth)) == NULL) return(NULL);
260 if (!EC_GROUP_copy(t, a)) goto err;
267 if (t) EC_GROUP_free(t);
274 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
280 int EC_METHOD_get_field_type(const EC_METHOD *meth)
282 return meth->field_type;
286 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
288 if (generator == NULL)
290 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
294 if (group->generator == NULL)
296 group->generator = EC_POINT_new(group);
297 if (group->generator == NULL) return 0;
299 if (!EC_POINT_copy(group->generator, generator)) return 0;
302 { if (!BN_copy(&group->order, order)) return 0; }
304 BN_zero(&group->order);
306 if (cofactor != NULL)
307 { if (!BN_copy(&group->cofactor, cofactor)) return 0; }
309 BN_zero(&group->cofactor);
315 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
317 return group->generator;
321 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
323 if (!BN_copy(order, &group->order))
326 return !BN_is_zero(order);
330 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
332 if (!BN_copy(cofactor, &group->cofactor))
335 return !BN_is_zero(&group->cofactor);
339 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
341 group->curve_name = nid;
345 int EC_GROUP_get_curve_name(const EC_GROUP *group)
347 return group->curve_name;
351 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
353 group->asn1_flag = flag;
357 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
359 return group->asn1_flag;
363 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
364 point_conversion_form_t form)
366 group->asn1_form = form;
370 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *group)
372 return group->asn1_form;
376 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
380 OPENSSL_free(group->seed);
388 if ((group->seed = OPENSSL_malloc(len)) == NULL)
390 memcpy(group->seed, p, len);
391 group->seed_len = len;
397 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
403 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
405 return group->seed_len;
409 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
411 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);
420 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
422 if (group->meth->group_get_curve == 0)
424 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
427 return group->meth->group_get_curve(group, p, a, b, ctx);
430 #ifndef OPENSSL_NO_EC2M
431 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
433 if (group->meth->group_set_curve == 0)
435 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
438 return group->meth->group_set_curve(group, p, a, b, ctx);
442 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
444 if (group->meth->group_get_curve == 0)
446 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, 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)
457 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
460 return group->meth->group_get_degree(group);
464 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
466 if (group->meth->group_check_discriminant == 0)
468 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
471 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) */
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))
491 ctx_new = ctx = BN_CTX_new();
496 a1 = BN_CTX_get(ctx);
497 a2 = BN_CTX_get(ctx);
498 a3 = BN_CTX_get(ctx);
499 b1 = BN_CTX_get(ctx);
500 b2 = BN_CTX_get(ctx);
501 b3 = BN_CTX_get(ctx);
510 /* XXX This approach assumes that the external representation
511 * of curves over the same field type is the same.
513 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
514 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
517 if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
520 /* XXX EC_POINT_cmp() assumes that the methods are equal */
521 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
522 EC_GROUP_get0_generator(b), ctx))
527 /* compare the order and cofactor */
528 if (!EC_GROUP_get_order(a, a1, ctx) ||
529 !EC_GROUP_get_order(b, b1, ctx) ||
530 !EC_GROUP_get_cofactor(a, a2, ctx) ||
531 !EC_GROUP_get_cofactor(b, b2, ctx))
538 if (BN_cmp(a1, b1) || BN_cmp(a2, b2))
550 /* this has 'package' visibility */
551 int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data,
552 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
559 for (d = *ex_data; d != NULL; d = d->next)
561 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
563 ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL);
569 /* no explicit entry needed */
572 d = OPENSSL_malloc(sizeof *d);
577 d->dup_func = dup_func;
578 d->free_func = free_func;
579 d->clear_free_func = clear_free_func;
587 /* this has 'package' visibility */
588 void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data,
589 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
591 const EC_EXTRA_DATA *d;
593 for (d = ex_data; d != NULL; d = d->next)
595 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
602 /* this has 'package' visibility */
603 void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data,
604 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
611 for (p = ex_data; *p != NULL; p = &((*p)->next))
613 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
615 EC_EXTRA_DATA *next = (*p)->next;
617 (*p)->free_func((*p)->data);
626 /* this has 'package' visibility */
627 void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data,
628 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
635 for (p = ex_data; *p != NULL; p = &((*p)->next))
637 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
639 EC_EXTRA_DATA *next = (*p)->next;
641 (*p)->clear_free_func((*p)->data);
650 /* this has 'package' visibility */
651 void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data)
661 EC_EXTRA_DATA *next = d->next;
663 d->free_func(d->data);
671 /* this has 'package' visibility */
672 void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data)
682 EC_EXTRA_DATA *next = d->next;
684 d->clear_free_func(d->data);
693 /* functions for EC_POINT objects */
695 EC_POINT *EC_POINT_new(const EC_GROUP *group)
701 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
704 if (group->meth->point_init == 0)
706 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
710 ret = OPENSSL_malloc(sizeof *ret);
713 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
717 ret->meth = group->meth;
719 if (!ret->meth->point_init(ret))
729 void EC_POINT_free(EC_POINT *point)
733 if (point->meth->point_finish != 0)
734 point->meth->point_finish(point);
739 void EC_POINT_clear_free(EC_POINT *point)
743 if (point->meth->point_clear_finish != 0)
744 point->meth->point_clear_finish(point);
745 else if (point->meth->point_finish != 0)
746 point->meth->point_finish(point);
747 OPENSSL_cleanse(point, sizeof *point);
752 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
754 if (dest->meth->point_copy == 0)
756 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
759 if (dest->meth != src->meth)
761 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
766 return dest->meth->point_copy(dest, src);
770 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
775 if (a == NULL) return NULL;
777 t = EC_POINT_new(group);
778 if (t == NULL) return(NULL);
779 r = EC_POINT_copy(t, a);
789 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
795 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
797 if (group->meth->point_set_to_infinity == 0)
799 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
802 if (group->meth != point->meth)
804 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
807 return group->meth->point_set_to_infinity(group, point);
811 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
812 const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
814 if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
816 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
819 if (group->meth != point->meth)
821 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
824 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
828 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
829 BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
831 if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
833 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
836 if (group->meth != point->meth)
838 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
841 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
845 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
846 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
848 if (group->meth->point_set_affine_coordinates == 0)
850 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
853 if (group->meth != point->meth)
855 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
858 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
861 #ifndef OPENSSL_NO_EC2M
862 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
863 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
865 if (group->meth->point_set_affine_coordinates == 0)
867 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
870 if (group->meth != point->meth)
872 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
875 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
879 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
880 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
882 if (group->meth->point_get_affine_coordinates == 0)
884 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
887 if (group->meth != point->meth)
889 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
892 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
895 #ifndef OPENSSL_NO_EC2M
896 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, const EC_POINT *point,
897 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
899 if (group->meth->point_get_affine_coordinates == 0)
901 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
904 if (group->meth != point->meth)
906 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
909 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
913 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
915 if (group->meth->add == 0)
917 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
920 if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
922 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
925 return group->meth->add(group, r, a, b, ctx);
929 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
931 if (group->meth->dbl == 0)
933 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
936 if ((group->meth != r->meth) || (r->meth != a->meth))
938 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
941 return group->meth->dbl(group, r, a, ctx);
945 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
947 if (group->meth->dbl == 0)
949 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
952 if (group->meth != a->meth)
954 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
957 return group->meth->invert(group, a, ctx);
961 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
963 if (group->meth->is_at_infinity == 0)
965 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
968 if (group->meth != point->meth)
970 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
973 return group->meth->is_at_infinity(group, point);
977 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
979 if (group->meth->is_on_curve == 0)
981 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
984 if (group->meth != point->meth)
986 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
989 return group->meth->is_on_curve(group, point, ctx);
993 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
995 if (group->meth->point_cmp == 0)
997 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1000 if ((group->meth != a->meth) || (a->meth != b->meth))
1002 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
1005 return group->meth->point_cmp(group, a, b, ctx);
1009 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
1011 if (group->meth->make_affine == 0)
1013 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1016 if (group->meth != point->meth)
1018 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1021 return group->meth->make_affine(group, point, ctx);
1025 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
1029 if (group->meth->points_make_affine == 0)
1031 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1034 for (i = 0; i < num; i++)
1036 if (group->meth != points[i]->meth)
1038 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1042 return group->meth->points_make_affine(group, num, points, ctx);
1046 /* Functions for point multiplication.
1048 * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
1049 * otherwise we dispatch through methods.
1052 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
1053 size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
1055 if (group->meth->mul == 0)
1057 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
1059 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
1062 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
1063 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
1065 /* just a convenient interface to EC_POINTs_mul() */
1067 const EC_POINT *points[1];
1068 const BIGNUM *scalars[1];
1071 scalars[0] = p_scalar;
1073 return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
1076 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
1078 if (group->meth->mul == 0)
1080 return ec_wNAF_precompute_mult(group, ctx);
1082 if (group->meth->precompute_mult != 0)
1083 return group->meth->precompute_mult(group, ctx);
1085 return 1; /* nothing to do, so report success */
1088 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
1090 if (group->meth->mul == 0)
1092 return ec_wNAF_have_precompute_mult(group);
1094 if (group->meth->have_precompute_mult != 0)
1095 return group->meth->have_precompute_mult(group);
1097 return 0; /* cannot tell whether precomputation has been performed */