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, ERR_R_PASSED_NULL_PARAMETER);
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_GROUP_free_all_extra_data(group);
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 != NULL && group->meth->group_finish != 0)
151 group->meth->group_finish(group);
153 EC_GROUP_clear_free_all_extra_data(group);
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_GROUP_free_all_extra_data(dest);
190 for (d = src->extra_data; d != NULL; d = d->next)
192 void *t = d->dup_func(d->data);
196 if (!EC_GROUP_set_extra_data(dest, 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 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_nid(EC_GROUP *group, int nid)
339 group->curve_name = nid;
343 int EC_GROUP_get_nid(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);
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_nid(a) && EC_GROUP_get_nid(b) &&
485 EC_GROUP_get_nid(a) == EC_GROUP_get_nid(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, b2) || 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_GROUP_set_extra_data(EC_GROUP *group, void *data,
550 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
557 for (d = group->extra_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_GROUP_SET_EXTRA_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;
579 d->next = group->extra_data;
580 group->extra_data = d;
585 /* this has 'package' visibility */
586 void *EC_GROUP_get_extra_data(const EC_GROUP *group,
587 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
594 for (d = group->extra_data; d != NULL; d = d->next)
596 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
603 /* this has 'package' visibility */
604 void EC_GROUP_free_extra_data(EC_GROUP *group,
605 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
612 for (p = &group->extra_data; *p != NULL; p = &((*p)->next))
614 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
616 EC_EXTRA_DATA *next = (*p)->next;
618 (*p)->free_func((*p)->data);
627 /* this has 'package' visibility */
628 void EC_GROUP_clear_free_extra_data(EC_GROUP *group,
629 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
636 for (p = &group->extra_data; *p != NULL; p = &((*p)->next))
638 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
640 EC_EXTRA_DATA *next = (*p)->next;
642 (*p)->clear_free_func((*p)->data);
651 /* this has 'package' visibility */
652 void EC_GROUP_free_all_extra_data(EC_GROUP *group)
659 d = group->extra_data;
662 EC_EXTRA_DATA *next = d->next;
664 d->free_func(d->data);
669 group->extra_data = NULL;
672 /* this has 'package' visibility */
673 void EC_GROUP_clear_free_all_extra_data(EC_GROUP *group)
680 d = group->extra_data;
683 EC_EXTRA_DATA *next = d->next;
685 d->clear_free_func(d->data);
690 group->extra_data = NULL;
694 /* functions for EC_POINT objects */
696 EC_POINT *EC_POINT_new(const EC_GROUP *group)
702 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
705 if (group->meth->point_init == 0)
707 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
711 ret = OPENSSL_malloc(sizeof *ret);
714 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
718 ret->meth = group->meth;
720 if (!ret->meth->point_init(ret))
730 void EC_POINT_free(EC_POINT *point)
734 if (point->meth->point_finish != 0)
735 point->meth->point_finish(point);
740 void EC_POINT_clear_free(EC_POINT *point)
744 if (point->meth->point_clear_finish != 0)
745 point->meth->point_clear_finish(point);
746 else if (point->meth != NULL && point->meth->point_finish != 0)
747 point->meth->point_finish(point);
748 OPENSSL_cleanse(point, sizeof *point);
753 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
755 if (dest->meth->point_copy == 0)
757 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
760 if (dest->meth != src->meth)
762 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
767 return dest->meth->point_copy(dest, src);
771 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
776 if (a == NULL) return NULL;
778 t = EC_POINT_new(group);
779 if (t == NULL) return(NULL);
780 r = EC_POINT_copy(t, a);
790 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
796 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
798 if (group->meth->point_set_to_infinity == 0)
800 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
803 if (group->meth != point->meth)
805 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
808 return group->meth->point_set_to_infinity(group, point);
812 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
813 const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
815 if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
817 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
820 if (group->meth != point->meth)
822 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
825 return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
829 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
830 BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
832 if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
834 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
837 if (group->meth != point->meth)
839 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
842 return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
846 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
847 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
849 if (group->meth->point_set_affine_coordinates == 0)
851 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
854 if (group->meth != point->meth)
856 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
859 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
863 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
864 const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
866 if (group->meth->point_set_affine_coordinates == 0)
868 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
871 if (group->meth != point->meth)
873 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
876 return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
880 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
881 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
883 if (group->meth->point_get_affine_coordinates == 0)
885 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
888 if (group->meth != point->meth)
890 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
893 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
897 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, const EC_POINT *point,
898 BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
900 if (group->meth->point_get_affine_coordinates == 0)
902 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
905 if (group->meth != point->meth)
907 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
910 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
914 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
915 const BIGNUM *x, int y_bit, BN_CTX *ctx)
917 if (group->meth->point_set_compressed_coordinates == 0)
919 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
922 if (group->meth != point->meth)
924 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
927 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
931 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
932 const BIGNUM *x, int y_bit, BN_CTX *ctx)
934 if (group->meth->point_set_compressed_coordinates == 0)
936 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
939 if (group->meth != point->meth)
941 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
944 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
948 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
949 unsigned char *buf, size_t len, BN_CTX *ctx)
951 if (group->meth->point2oct == 0)
953 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
956 if (group->meth != point->meth)
958 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
961 return group->meth->point2oct(group, point, form, buf, len, ctx);
965 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
966 const unsigned char *buf, size_t len, BN_CTX *ctx)
968 if (group->meth->oct2point == 0)
970 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
973 if (group->meth != point->meth)
975 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
978 return group->meth->oct2point(group, point, buf, len, ctx);
982 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
984 if (group->meth->add == 0)
986 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
989 if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
991 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
994 return group->meth->add(group, r, a, b, ctx);
998 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
1000 if (group->meth->dbl == 0)
1002 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1005 if ((group->meth != r->meth) || (r->meth != a->meth))
1007 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
1010 return group->meth->dbl(group, r, a, ctx);
1014 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
1016 if (group->meth->dbl == 0)
1018 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1021 if (group->meth != a->meth)
1023 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
1026 return group->meth->invert(group, a, ctx);
1030 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
1032 if (group->meth->is_at_infinity == 0)
1034 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1037 if (group->meth != point->meth)
1039 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
1042 return group->meth->is_at_infinity(group, point);
1046 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
1048 if (group->meth->is_on_curve == 0)
1050 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1053 if (group->meth != point->meth)
1055 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
1058 return group->meth->is_on_curve(group, point, ctx);
1062 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
1064 if (group->meth->point_cmp == 0)
1066 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1069 if ((group->meth != a->meth) || (a->meth != b->meth))
1071 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
1074 return group->meth->point_cmp(group, a, b, ctx);
1078 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
1080 if (group->meth->make_affine == 0)
1082 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1085 if (group->meth != point->meth)
1087 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1090 return group->meth->make_affine(group, point, ctx);
1094 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
1098 if (group->meth->points_make_affine == 0)
1100 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1103 for (i = 0; i < num; i++)
1105 if (group->meth != points[i]->meth)
1107 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1111 return group->meth->points_make_affine(group, num, points, ctx);
1115 /* Functions for point multiplication.
1117 * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
1118 * otherwise we dispatch through methods.
1121 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
1122 size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
1124 if (group->meth->mul == 0)
1126 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
1128 return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
1131 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
1132 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
1134 /* just a convenient interface to EC_POINTs_mul() */
1136 const EC_POINT *points[1];
1137 const BIGNUM *scalars[1];
1140 scalars[0] = p_scalar;
1142 return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
1145 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
1147 if (group->meth->mul == 0)
1149 return ec_wNAF_precompute_mult(group, ctx);
1151 if (group->meth->precompute_mult != 0)
1152 return group->meth->precompute_mult(group, ctx);
1154 return 1; /* nothing to do, so report success */
1157 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
1159 if (group->meth->mul == 0)
1161 return ec_wNAF_have_precompute_mult(group);
1163 if (group->meth->have_precompute_mult != 0)
1164 return group->meth->have_precompute_mult(group);
1166 return 0; /* cannot tell whether precomputation has been performed */