2 * Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
5 * Licensed under the Apache License 2.0 (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
12 * EC_GROUP low level APIs are deprecated for public use, but still ok for
15 #include "internal/deprecated.h"
18 #include <openssl/params.h>
19 #include <openssl/core_names.h>
20 #include <openssl/err.h>
21 #include <openssl/opensslv.h>
22 #include "crypto/ec.h"
23 #include "internal/nelem.h"
25 #include "e_os.h" /* strcasecmp */
27 /* functions for EC_GROUP objects */
29 EC_GROUP *ossl_ec_group_new_ex(OSSL_LIB_CTX *libctx, const char *propq,
30 const EC_METHOD *meth)
35 ERR_raise(ERR_LIB_EC, EC_R_SLOT_FULL);
38 if (meth->group_init == 0) {
39 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
43 ret = OPENSSL_zalloc(sizeof(*ret));
45 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
51 ret->propq = OPENSSL_strdup(propq);
52 if (ret->propq == NULL) {
53 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
58 if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
59 ret->order = BN_new();
60 if (ret->order == NULL)
62 ret->cofactor = BN_new();
63 if (ret->cofactor == NULL)
66 ret->asn1_flag = OPENSSL_EC_EXPLICIT_CURVE;
67 ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
68 if (!meth->group_init(ret))
74 BN_free(ret->cofactor);
75 OPENSSL_free(ret->propq);
80 #ifndef OPENSSL_NO_DEPRECATED_3_0
82 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
84 return ossl_ec_group_new_ex(NULL, NULL, meth);
89 void EC_pre_comp_free(EC_GROUP *group)
91 switch (group->pre_comp_type) {
95 #ifdef ECP_NISTZ256_ASM
96 EC_nistz256_pre_comp_free(group->pre_comp.nistz256);
99 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
101 EC_nistp224_pre_comp_free(group->pre_comp.nistp224);
104 EC_nistp256_pre_comp_free(group->pre_comp.nistp256);
107 EC_nistp521_pre_comp_free(group->pre_comp.nistp521);
116 EC_ec_pre_comp_free(group->pre_comp.ec);
119 group->pre_comp.ec = NULL;
122 void EC_GROUP_free(EC_GROUP *group)
127 if (group->meth->group_finish != 0)
128 group->meth->group_finish(group);
130 EC_pre_comp_free(group);
131 BN_MONT_CTX_free(group->mont_data);
132 EC_POINT_free(group->generator);
133 BN_free(group->order);
134 BN_free(group->cofactor);
135 OPENSSL_free(group->seed);
136 OPENSSL_free(group->propq);
140 #ifndef OPENSSL_NO_DEPRECATED_3_0
141 void EC_GROUP_clear_free(EC_GROUP *group)
146 if (group->meth->group_clear_finish != 0)
147 group->meth->group_clear_finish(group);
148 else if (group->meth->group_finish != 0)
149 group->meth->group_finish(group);
151 EC_pre_comp_free(group);
152 BN_MONT_CTX_free(group->mont_data);
153 EC_POINT_clear_free(group->generator);
154 BN_clear_free(group->order);
155 BN_clear_free(group->cofactor);
156 OPENSSL_clear_free(group->seed, group->seed_len);
157 OPENSSL_clear_free(group, sizeof(*group));
161 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
163 if (dest->meth->group_copy == 0) {
164 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
167 if (dest->meth != src->meth) {
168 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
174 dest->libctx = src->libctx;
175 dest->curve_name = src->curve_name;
177 /* Copy precomputed */
178 dest->pre_comp_type = src->pre_comp_type;
179 switch (src->pre_comp_type) {
181 dest->pre_comp.ec = NULL;
184 #ifdef ECP_NISTZ256_ASM
185 dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256);
188 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
190 dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224);
193 dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256);
196 dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521);
205 dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec);
209 if (src->mont_data != NULL) {
210 if (dest->mont_data == NULL) {
211 dest->mont_data = BN_MONT_CTX_new();
212 if (dest->mont_data == NULL)
215 if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
218 /* src->generator == NULL */
219 BN_MONT_CTX_free(dest->mont_data);
220 dest->mont_data = NULL;
223 if (src->generator != NULL) {
224 if (dest->generator == NULL) {
225 dest->generator = EC_POINT_new(dest);
226 if (dest->generator == NULL)
229 if (!EC_POINT_copy(dest->generator, src->generator))
232 /* src->generator == NULL */
233 EC_POINT_clear_free(dest->generator);
234 dest->generator = NULL;
237 if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
238 if (!BN_copy(dest->order, src->order))
240 if (!BN_copy(dest->cofactor, src->cofactor))
244 dest->asn1_flag = src->asn1_flag;
245 dest->asn1_form = src->asn1_form;
246 dest->decoded_from_explicit_params = src->decoded_from_explicit_params;
249 OPENSSL_free(dest->seed);
250 if ((dest->seed = OPENSSL_malloc(src->seed_len)) == NULL) {
251 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
254 if (!memcpy(dest->seed, src->seed, src->seed_len))
256 dest->seed_len = src->seed_len;
258 OPENSSL_free(dest->seed);
263 return dest->meth->group_copy(dest, src);
266 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
274 if ((t = ossl_ec_group_new_ex(a->libctx, a->propq, a->meth)) == NULL)
276 if (!EC_GROUP_copy(t, a))
289 #ifndef OPENSSL_NO_DEPRECATED_3_0
290 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
295 int EC_METHOD_get_field_type(const EC_METHOD *meth)
297 return meth->field_type;
301 static int ec_precompute_mont_data(EC_GROUP *);
304 * Try computing cofactor from the generator order (n) and field cardinality (q).
305 * This works for all curves of cryptographic interest.
307 * Hasse thm: q + 1 - 2*sqrt(q) <= n*h <= q + 1 + 2*sqrt(q)
308 * h_min = (q + 1 - 2*sqrt(q))/n
309 * h_max = (q + 1 + 2*sqrt(q))/n
310 * h_max - h_min = 4*sqrt(q)/n
311 * So if n > 4*sqrt(q) holds, there is only one possible value for h:
312 * h = \lfloor (h_min + h_max)/2 \rceil = \lfloor (q + 1)/n \rceil
314 * Otherwise, zero cofactor and return success.
316 static int ec_guess_cofactor(EC_GROUP *group) {
322 * If the cofactor is too large, we cannot guess it.
323 * The RHS of below is a strict overestimate of lg(4 * sqrt(q))
325 if (BN_num_bits(group->order) <= (BN_num_bits(group->field) + 1) / 2 + 3) {
327 BN_zero(group->cofactor);
332 if ((ctx = BN_CTX_new_ex(group->libctx)) == NULL)
336 if ((q = BN_CTX_get(ctx)) == NULL)
339 /* set q = 2**m for binary fields; q = p otherwise */
340 if (group->meth->field_type == NID_X9_62_characteristic_two_field) {
342 if (!BN_set_bit(q, BN_num_bits(group->field) - 1))
345 if (!BN_copy(q, group->field))
349 /* compute h = \lfloor (q + 1)/n \rceil = \lfloor (q + 1 + n/2)/n \rfloor */
350 if (!BN_rshift1(group->cofactor, group->order) /* n/2 */
351 || !BN_add(group->cofactor, group->cofactor, q) /* q + n/2 */
353 || !BN_add(group->cofactor, group->cofactor, BN_value_one())
354 /* (q + 1 + n/2)/n */
355 || !BN_div(group->cofactor, NULL, group->cofactor, group->order, ctx))
364 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
365 const BIGNUM *order, const BIGNUM *cofactor)
367 if (generator == NULL) {
368 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
372 /* require group->field >= 1 */
373 if (group->field == NULL || BN_is_zero(group->field)
374 || BN_is_negative(group->field)) {
375 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
380 * - require order >= 1
381 * - enforce upper bound due to Hasse thm: order can be no more than one bit
382 * longer than field cardinality
384 if (order == NULL || BN_is_zero(order) || BN_is_negative(order)
385 || BN_num_bits(order) > BN_num_bits(group->field) + 1) {
386 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
391 * Unfortunately the cofactor is an optional field in many standards.
392 * Internally, the lib uses 0 cofactor as a marker for "unknown cofactor".
393 * So accept cofactor == NULL or cofactor >= 0.
395 if (cofactor != NULL && BN_is_negative(cofactor)) {
396 ERR_raise(ERR_LIB_EC, EC_R_UNKNOWN_COFACTOR);
400 if (group->generator == NULL) {
401 group->generator = EC_POINT_new(group);
402 if (group->generator == NULL)
405 if (!EC_POINT_copy(group->generator, generator))
408 if (!BN_copy(group->order, order))
411 /* Either take the provided positive cofactor, or try to compute it */
412 if (cofactor != NULL && !BN_is_zero(cofactor)) {
413 if (!BN_copy(group->cofactor, cofactor))
415 } else if (!ec_guess_cofactor(group)) {
416 BN_zero(group->cofactor);
421 * Some groups have an order with
422 * factors of two, which makes the Montgomery setup fail.
423 * |group->mont_data| will be NULL in this case.
425 if (BN_is_odd(group->order)) {
426 return ec_precompute_mont_data(group);
429 BN_MONT_CTX_free(group->mont_data);
430 group->mont_data = NULL;
434 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
436 return group->generator;
439 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
441 return group->mont_data;
444 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
446 if (group->order == NULL)
448 if (!BN_copy(order, group->order))
451 return !BN_is_zero(order);
454 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
459 int EC_GROUP_order_bits(const EC_GROUP *group)
461 return group->meth->group_order_bits(group);
464 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
468 if (group->cofactor == NULL)
470 if (!BN_copy(cofactor, group->cofactor))
473 return !BN_is_zero(group->cofactor);
476 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
478 return group->cofactor;
481 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
483 group->curve_name = nid;
486 ? OPENSSL_EC_NAMED_CURVE
487 : OPENSSL_EC_EXPLICIT_CURVE;
490 int EC_GROUP_get_curve_name(const EC_GROUP *group)
492 return group->curve_name;
495 const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group)
500 int EC_GROUP_get_field_type(const EC_GROUP *group)
502 return group->meth->field_type;
505 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
507 group->asn1_flag = flag;
510 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
512 return group->asn1_flag;
515 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
516 point_conversion_form_t form)
518 group->asn1_form = form;
521 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
524 return group->asn1_form;
527 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
529 OPENSSL_free(group->seed);
536 if ((group->seed = OPENSSL_malloc(len)) == NULL) {
537 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
540 memcpy(group->seed, p, len);
541 group->seed_len = len;
546 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
551 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
553 return group->seed_len;
556 int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
557 const BIGNUM *b, BN_CTX *ctx)
559 if (group->meth->group_set_curve == 0) {
560 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
563 return group->meth->group_set_curve(group, p, a, b, ctx);
566 int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
569 if (group->meth->group_get_curve == NULL) {
570 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
573 return group->meth->group_get_curve(group, p, a, b, ctx);
576 #ifndef OPENSSL_NO_DEPRECATED_3_0
577 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
578 const BIGNUM *b, BN_CTX *ctx)
580 return EC_GROUP_set_curve(group, p, a, b, ctx);
583 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
584 BIGNUM *b, BN_CTX *ctx)
586 return EC_GROUP_get_curve(group, p, a, b, ctx);
589 # ifndef OPENSSL_NO_EC2M
590 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
591 const BIGNUM *b, BN_CTX *ctx)
593 return EC_GROUP_set_curve(group, p, a, b, ctx);
596 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
597 BIGNUM *b, BN_CTX *ctx)
599 return EC_GROUP_get_curve(group, p, a, b, ctx);
604 int EC_GROUP_get_degree(const EC_GROUP *group)
606 if (group->meth->group_get_degree == 0) {
607 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
610 return group->meth->group_get_degree(group);
613 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
615 if (group->meth->group_check_discriminant == 0) {
616 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
619 return group->meth->group_check_discriminant(group, ctx);
622 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
625 BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
627 BN_CTX *ctx_new = NULL;
630 /* compare the field types */
631 if (EC_GROUP_get_field_type(a) != EC_GROUP_get_field_type(b))
633 /* compare the curve name (if present in both) */
634 if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
635 EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
637 if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
642 ctx_new = ctx = BN_CTX_new();
648 a1 = BN_CTX_get(ctx);
649 a2 = BN_CTX_get(ctx);
650 a3 = BN_CTX_get(ctx);
651 b1 = BN_CTX_get(ctx);
652 b2 = BN_CTX_get(ctx);
653 b3 = BN_CTX_get(ctx);
657 BN_CTX_free(ctx_new);
663 * XXX This approach assumes that the external representation of curves
664 * over the same field type is the same.
666 if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
667 !b->meth->group_get_curve(b, b1, b2, b3, ctx))
670 /* return 1 if the curve parameters are different */
671 if (r || BN_cmp(a1, b1) != 0 || BN_cmp(a2, b2) != 0 || BN_cmp(a3, b3) != 0)
674 /* XXX EC_POINT_cmp() assumes that the methods are equal */
675 /* return 1 if the generators are different */
676 if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
677 EC_GROUP_get0_generator(b), ctx) != 0)
681 const BIGNUM *ao, *bo, *ac, *bc;
682 /* compare the orders */
683 ao = EC_GROUP_get0_order(a);
684 bo = EC_GROUP_get0_order(b);
685 if (ao == NULL || bo == NULL) {
686 /* return an error if either order is NULL */
690 if (BN_cmp(ao, bo) != 0) {
691 /* return 1 if orders are different */
696 * It gets here if the curve parameters and generator matched.
697 * Now check the optional cofactors (if both are present).
699 ac = EC_GROUP_get0_cofactor(a);
700 bc = EC_GROUP_get0_cofactor(b);
701 /* Returns 1 (mismatch) if both cofactors are specified and different */
702 if (!BN_is_zero(ac) && !BN_is_zero(bc) && BN_cmp(ac, bc) != 0)
704 /* Returns 0 if the parameters matched */
709 BN_CTX_free(ctx_new);
714 /* functions for EC_POINT objects */
716 EC_POINT *EC_POINT_new(const EC_GROUP *group)
721 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
724 if (group->meth->point_init == NULL) {
725 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
729 ret = OPENSSL_zalloc(sizeof(*ret));
731 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
735 ret->meth = group->meth;
736 ret->curve_name = group->curve_name;
738 if (!ret->meth->point_init(ret)) {
746 void EC_POINT_free(EC_POINT *point)
751 if (point->meth->point_finish != 0)
752 point->meth->point_finish(point);
756 void EC_POINT_clear_free(EC_POINT *point)
761 if (point->meth->point_clear_finish != 0)
762 point->meth->point_clear_finish(point);
763 else if (point->meth->point_finish != 0)
764 point->meth->point_finish(point);
765 OPENSSL_clear_free(point, sizeof(*point));
768 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
770 if (dest->meth->point_copy == 0) {
771 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
774 if (dest->meth != src->meth
775 || (dest->curve_name != src->curve_name
776 && dest->curve_name != 0
777 && src->curve_name != 0)) {
778 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
783 return dest->meth->point_copy(dest, src);
786 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
794 t = EC_POINT_new(group);
797 r = EC_POINT_copy(t, a);
805 #ifndef OPENSSL_NO_DEPRECATED_3_0
806 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
812 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
814 if (group->meth->point_set_to_infinity == 0) {
815 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
818 if (group->meth != point->meth) {
819 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
822 return group->meth->point_set_to_infinity(group, point);
825 #ifndef OPENSSL_NO_DEPRECATED_3_0
826 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
827 EC_POINT *point, const BIGNUM *x,
828 const BIGNUM *y, const BIGNUM *z,
831 if (group->meth->field_type != NID_X9_62_prime_field) {
832 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
835 if (!ec_point_is_compat(point, group)) {
836 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
839 return ossl_ec_GFp_simple_set_Jprojective_coordinates_GFp(group, point,
843 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
844 const EC_POINT *point, BIGNUM *x,
845 BIGNUM *y, BIGNUM *z,
848 if (group->meth->field_type != NID_X9_62_prime_field) {
849 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
852 if (!ec_point_is_compat(point, group)) {
853 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
856 return ossl_ec_GFp_simple_get_Jprojective_coordinates_GFp(group, point,
861 int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *point,
862 const BIGNUM *x, const BIGNUM *y,
865 if (group->meth->point_set_affine_coordinates == NULL) {
866 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
869 if (!ec_point_is_compat(point, group)) {
870 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
873 if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
876 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
877 ERR_raise(ERR_LIB_EC, EC_R_POINT_IS_NOT_ON_CURVE);
883 #ifndef OPENSSL_NO_DEPRECATED_3_0
884 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
885 EC_POINT *point, const BIGNUM *x,
886 const BIGNUM *y, BN_CTX *ctx)
888 return EC_POINT_set_affine_coordinates(group, point, x, y, ctx);
891 # ifndef OPENSSL_NO_EC2M
892 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
893 EC_POINT *point, const BIGNUM *x,
894 const BIGNUM *y, BN_CTX *ctx)
896 return EC_POINT_set_affine_coordinates(group, point, x, y, ctx);
901 int EC_POINT_get_affine_coordinates(const EC_GROUP *group,
902 const EC_POINT *point, BIGNUM *x, BIGNUM *y,
905 if (group->meth->point_get_affine_coordinates == NULL) {
906 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
909 if (!ec_point_is_compat(point, group)) {
910 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
913 if (EC_POINT_is_at_infinity(group, point)) {
914 ERR_raise(ERR_LIB_EC, EC_R_POINT_AT_INFINITY);
917 return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
920 #ifndef OPENSSL_NO_DEPRECATED_3_0
921 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
922 const EC_POINT *point, BIGNUM *x,
923 BIGNUM *y, BN_CTX *ctx)
925 return EC_POINT_get_affine_coordinates(group, point, x, y, ctx);
928 # ifndef OPENSSL_NO_EC2M
929 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
930 const EC_POINT *point, BIGNUM *x,
931 BIGNUM *y, BN_CTX *ctx)
933 return EC_POINT_get_affine_coordinates(group, point, x, y, ctx);
938 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
939 const EC_POINT *b, BN_CTX *ctx)
941 if (group->meth->add == 0) {
942 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
945 if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)
946 || !ec_point_is_compat(b, group)) {
947 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
950 return group->meth->add(group, r, a, b, ctx);
953 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
956 if (group->meth->dbl == 0) {
957 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
960 if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)) {
961 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
964 return group->meth->dbl(group, r, a, ctx);
967 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
969 if (group->meth->invert == 0) {
970 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
973 if (!ec_point_is_compat(a, group)) {
974 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
977 return group->meth->invert(group, a, ctx);
980 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
982 if (group->meth->is_at_infinity == 0) {
983 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
986 if (!ec_point_is_compat(point, group)) {
987 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
990 return group->meth->is_at_infinity(group, point);
994 * Check whether an EC_POINT is on the curve or not. Note that the return
995 * value for this function should NOT be treated as a boolean. Return values:
996 * 1: The point is on the curve
997 * 0: The point is not on the curve
998 * -1: An error occurred
1000 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
1003 if (group->meth->is_on_curve == 0) {
1004 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1007 if (!ec_point_is_compat(point, group)) {
1008 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1011 return group->meth->is_on_curve(group, point, ctx);
1014 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
1017 if (group->meth->point_cmp == 0) {
1018 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1021 if (!ec_point_is_compat(a, group) || !ec_point_is_compat(b, group)) {
1022 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1025 return group->meth->point_cmp(group, a, b, ctx);
1028 #ifndef OPENSSL_NO_DEPRECATED_3_0
1029 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
1031 if (group->meth->make_affine == 0) {
1032 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1035 if (!ec_point_is_compat(point, group)) {
1036 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1039 return group->meth->make_affine(group, point, ctx);
1042 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
1043 EC_POINT *points[], BN_CTX *ctx)
1047 if (group->meth->points_make_affine == 0) {
1048 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1051 for (i = 0; i < num; i++) {
1052 if (!ec_point_is_compat(points[i], group)) {
1053 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1057 return group->meth->points_make_affine(group, num, points, ctx);
1062 * Functions for point multiplication. If group->meth->mul is 0, we use the
1063 * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
1067 #ifndef OPENSSL_NO_DEPRECATED_3_0
1068 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
1069 size_t num, const EC_POINT *points[],
1070 const BIGNUM *scalars[], BN_CTX *ctx)
1075 BN_CTX *new_ctx = NULL;
1078 if (!ec_point_is_compat(r, group)) {
1079 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1083 if (scalar == NULL && num == 0)
1084 return EC_POINT_set_to_infinity(group, r);
1086 for (i = 0; i < num; i++) {
1087 if (!ec_point_is_compat(points[i], group)) {
1088 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1095 ctx = new_ctx = BN_CTX_secure_new();
1098 ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
1102 if (group->meth->mul != NULL)
1103 ret = group->meth->mul(group, r, scalar, num, points, scalars, ctx);
1106 ret = ossl_ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
1109 BN_CTX_free(new_ctx);
1115 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
1116 const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
1121 BN_CTX *new_ctx = NULL;
1124 if (!ec_point_is_compat(r, group)
1125 || (point != NULL && !ec_point_is_compat(point, group))) {
1126 ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS);
1130 if (g_scalar == NULL && p_scalar == NULL)
1131 return EC_POINT_set_to_infinity(group, r);
1135 ctx = new_ctx = BN_CTX_secure_new();
1138 ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
1142 num = (point != NULL && p_scalar != NULL) ? 1 : 0;
1143 if (group->meth->mul != NULL)
1144 ret = group->meth->mul(group, r, g_scalar, num, &point, &p_scalar, ctx);
1147 ret = ossl_ec_wNAF_mul(group, r, g_scalar, num, &point, &p_scalar, ctx);
1150 BN_CTX_free(new_ctx);
1155 #ifndef OPENSSL_NO_DEPRECATED_3_0
1156 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
1158 if (group->meth->mul == 0)
1160 return ossl_ec_wNAF_precompute_mult(group, ctx);
1162 if (group->meth->precompute_mult != 0)
1163 return group->meth->precompute_mult(group, ctx);
1165 return 1; /* nothing to do, so report success */
1168 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
1170 if (group->meth->mul == 0)
1172 return ossl_ec_wNAF_have_precompute_mult(group);
1174 if (group->meth->have_precompute_mult != 0)
1175 return group->meth->have_precompute_mult(group);
1177 return 0; /* cannot tell whether precomputation has
1183 * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
1184 * returns one on success. On error it returns zero.
1186 static int ec_precompute_mont_data(EC_GROUP *group)
1188 BN_CTX *ctx = BN_CTX_new_ex(group->libctx);
1191 BN_MONT_CTX_free(group->mont_data);
1192 group->mont_data = NULL;
1197 group->mont_data = BN_MONT_CTX_new();
1198 if (group->mont_data == NULL)
1201 if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
1202 BN_MONT_CTX_free(group->mont_data);
1203 group->mont_data = NULL;
1216 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
1218 return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
1221 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
1223 return CRYPTO_get_ex_data(&key->ex_data, idx);
1227 int ossl_ec_group_simple_order_bits(const EC_GROUP *group)
1229 if (group->order == NULL)
1231 return BN_num_bits(group->order);
1234 static int ec_field_inverse_mod_ord(const EC_GROUP *group, BIGNUM *r,
1235 const BIGNUM *x, BN_CTX *ctx)
1240 BN_CTX *new_ctx = NULL;
1243 if (group->mont_data == NULL)
1248 ctx = new_ctx = BN_CTX_secure_new();
1254 if ((e = BN_CTX_get(ctx)) == NULL)
1258 * We want inverse in constant time, therefore we utilize the fact
1259 * order must be prime and use Fermats Little Theorem instead.
1261 if (!BN_set_word(e, 2))
1263 if (!BN_sub(e, group->order, e))
1266 * Exponent e is public.
1267 * No need for scatter-gather or BN_FLG_CONSTTIME.
1269 if (!BN_mod_exp_mont(r, x, e, group->order, ctx, group->mont_data))
1277 BN_CTX_free(new_ctx);
1283 * Default behavior, if group->meth->field_inverse_mod_ord is NULL:
1284 * - When group->order is even, this function returns an error.
1285 * - When group->order is otherwise composite, the correctness
1286 * of the output is not guaranteed.
1287 * - When x is outside the range [1, group->order), the correctness
1288 * of the output is not guaranteed.
1289 * - Otherwise, this function returns the multiplicative inverse in the
1290 * range [1, group->order).
1292 * EC_METHODs must implement their own field_inverse_mod_ord for
1293 * other functionality.
1295 int ossl_ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
1296 const BIGNUM *x, BN_CTX *ctx)
1298 if (group->meth->field_inverse_mod_ord != NULL)
1299 return group->meth->field_inverse_mod_ord(group, res, x, ctx);
1301 return ec_field_inverse_mod_ord(group, res, x, ctx);
1305 * Coordinate blinding for EC_POINT.
1307 * The underlying EC_METHOD can optionally implement this function:
1308 * underlying implementations should return 0 on errors, or 1 on
1311 * This wrapper returns 1 in case the underlying EC_METHOD does not
1312 * support coordinate blinding.
1314 int ossl_ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p,
1317 if (group->meth->blind_coordinates == NULL)
1318 return 1; /* ignore if not implemented */
1320 return group->meth->blind_coordinates(group, p, ctx);
1323 int EC_GROUP_get_basis_type(const EC_GROUP *group)
1327 if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field)
1328 /* everything else is currently not supported */
1331 /* Find the last non-zero element of group->poly[] */
1333 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
1338 return NID_X9_62_ppBasis;
1340 return NID_X9_62_tpBasis;
1342 /* everything else is currently not supported */
1346 #ifndef OPENSSL_NO_EC2M
1347 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
1352 if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field
1353 || !((group->poly[0] != 0) && (group->poly[1] != 0)
1354 && (group->poly[2] == 0))) {
1355 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1360 *k = group->poly[1];
1365 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
1366 unsigned int *k2, unsigned int *k3)
1371 if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field
1372 || !((group->poly[0] != 0) && (group->poly[1] != 0)
1373 && (group->poly[2] != 0) && (group->poly[3] != 0)
1374 && (group->poly[4] == 0))) {
1375 ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1380 *k1 = group->poly[3];
1382 *k2 = group->poly[2];
1384 *k3 = group->poly[1];
1392 * Check if the explicit parameters group matches any built-in curves.
1394 * We create a copy of the group just built, so that we can remove optional
1395 * fields for the lookup: we do this to avoid the possibility that one of
1396 * the optional parameters is used to force the library into using a less
1397 * performant and less secure EC_METHOD instead of the specialized one.
1398 * In any case, `seed` is not really used in any computation, while a
1399 * cofactor different from the one in the built-in table is just
1400 * mathematically wrong anyway and should not be used.
1402 static EC_GROUP *ec_group_explicit_to_named(const EC_GROUP *group,
1403 OSSL_LIB_CTX *libctx,
1407 EC_GROUP *ret_group = NULL, *dup = NULL;
1410 const EC_POINT *point = EC_GROUP_get0_generator(group);
1411 const BIGNUM *order = EC_GROUP_get0_order(group);
1412 int no_seed = (EC_GROUP_get0_seed(group) == NULL);
1414 if ((dup = EC_GROUP_dup(group)) == NULL
1415 || EC_GROUP_set_seed(dup, NULL, 0) != 1
1416 || !EC_GROUP_set_generator(dup, point, order, NULL))
1418 if ((curve_name_nid = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
1420 * The input explicit parameters successfully matched one of the
1421 * built-in curves: often for built-in curves we have specialized
1422 * methods with better performance and hardening.
1424 * In this case we replace the `EC_GROUP` created through explicit
1425 * parameters with one created from a named group.
1428 # ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
1430 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
1431 * the same curve, we prefer the SECP nid when matching explicit
1432 * parameters as that is associated with a specialized EC_METHOD.
1434 if (curve_name_nid == NID_wap_wsg_idm_ecid_wtls12)
1435 curve_name_nid = NID_secp224r1;
1436 # endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
1438 ret_group = EC_GROUP_new_by_curve_name_ex(libctx, propq, curve_name_nid);
1439 if (ret_group == NULL)
1443 * Set the flag so that EC_GROUPs created from explicit parameters are
1444 * serialized using explicit parameters by default.
1446 EC_GROUP_set_asn1_flag(ret_group, OPENSSL_EC_EXPLICIT_CURVE);
1449 * If the input params do not contain the optional seed field we make
1450 * sure it is not added to the returned group.
1452 * The seed field is not really used inside libcrypto anyway, and
1453 * adding it to parsed explicit parameter keys would alter their DER
1454 * encoding output (because of the extra field) which could impact
1455 * applications fingerprinting keys by their DER encoding.
1458 if (EC_GROUP_set_seed(ret_group, NULL, 0) != 1)
1462 ret_group = (EC_GROUP *)group;
1468 EC_GROUP_free(ret_group);
1471 #endif /* FIPS_MODULE */
1473 static EC_GROUP *group_new_from_name(const OSSL_PARAM *p,
1474 OSSL_LIB_CTX *libctx, const char *propq)
1477 const char *curve_name = NULL;
1479 switch (p->data_type) {
1480 case OSSL_PARAM_UTF8_STRING:
1481 /* The OSSL_PARAM functions have no support for this */
1482 curve_name = p->data;
1483 ok = (curve_name != NULL);
1485 case OSSL_PARAM_UTF8_PTR:
1486 ok = OSSL_PARAM_get_utf8_ptr(p, &curve_name);
1491 nid = ossl_ec_curve_name2nid(curve_name);
1492 if (nid == NID_undef) {
1493 ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE);
1496 return EC_GROUP_new_by_curve_name_ex(libctx, propq, nid);
1502 /* These parameters can be set directly into an EC_GROUP */
1503 int ossl_ec_group_set_params(EC_GROUP *group, const OSSL_PARAM params[])
1505 int encoding_flag = -1, format = -1;
1506 const OSSL_PARAM *p;
1508 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT);
1510 if (!ossl_ec_pt_format_param2id(p, &format)) {
1511 ECerr(0, EC_R_INVALID_FORM);
1514 EC_GROUP_set_point_conversion_form(group, format);
1517 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ENCODING);
1519 if (!ossl_ec_encoding_param2id(p, &encoding_flag)) {
1520 ECerr(0, EC_R_INVALID_FORM);
1523 EC_GROUP_set_asn1_flag(group, encoding_flag);
1526 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED);
1528 /* The seed is allowed to be NULL */
1529 if (p->data_type != OSSL_PARAM_OCTET_STRING
1530 || !EC_GROUP_set_seed(group, p->data, p->data_size)) {
1531 ECerr(0, EC_R_INVALID_SEED);
1538 EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],
1539 OSSL_LIB_CTX *libctx, const char *propq)
1541 const OSSL_PARAM *ptmp;
1542 EC_GROUP *group = NULL;
1545 const OSSL_PARAM *pa, *pb;
1547 EC_GROUP *named_group = NULL;
1548 BIGNUM *p = NULL, *a = NULL, *b = NULL, *order = NULL, *cofactor = NULL;
1549 EC_POINT *point = NULL;
1551 int is_prime_field = 1;
1552 BN_CTX *bnctx = NULL;
1553 const unsigned char *buf = NULL;
1554 int encoding_flag = -1;
1557 /* This is the simple named group case */
1558 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
1560 group = group_new_from_name(ptmp, libctx, propq);
1561 if (group != NULL) {
1562 if (!ossl_ec_group_set_params(group, params)) {
1563 EC_GROUP_free(group);
1570 ERR_raise(ERR_LIB_EC, EC_R_EXPLICIT_PARAMS_NOT_SUPPORTED);
1573 /* If it gets here then we are trying explicit parameters */
1574 bnctx = BN_CTX_new_ex(libctx);
1575 if (bnctx == NULL) {
1576 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1579 BN_CTX_start(bnctx);
1581 p = BN_CTX_get(bnctx);
1582 a = BN_CTX_get(bnctx);
1583 b = BN_CTX_get(bnctx);
1584 order = BN_CTX_get(bnctx);
1585 if (order == NULL) {
1586 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1590 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE);
1591 if (ptmp == NULL || ptmp->data_type != OSSL_PARAM_UTF8_STRING) {
1592 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
1595 if (strcasecmp(ptmp->data, SN_X9_62_prime_field) == 0) {
1597 } else if (strcasecmp(ptmp->data, SN_X9_62_characteristic_two_field) == 0) {
1601 ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
1605 pa = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_A);
1606 if (!OSSL_PARAM_get_BN(pa, &a)) {
1607 ERR_raise(ERR_LIB_EC, EC_R_INVALID_A);
1610 pb = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_B);
1611 if (!OSSL_PARAM_get_BN(pb, &b)) {
1612 ERR_raise(ERR_LIB_EC, EC_R_INVALID_B);
1616 /* extract the prime number or irreducible polynomial */
1617 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_P);
1618 if (!OSSL_PARAM_get_BN(ptmp, &p)) {
1619 ERR_raise(ERR_LIB_EC, EC_R_INVALID_P);
1623 if (is_prime_field) {
1624 if (BN_is_negative(p) || BN_is_zero(p)) {
1625 ERR_raise(ERR_LIB_EC, EC_R_INVALID_P);
1628 field_bits = BN_num_bits(p);
1629 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
1630 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
1634 /* create the EC_GROUP structure */
1635 group = EC_GROUP_new_curve_GFp(p, a, b, bnctx);
1637 # ifdef OPENSSL_NO_EC2M
1638 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
1641 /* create the EC_GROUP structure */
1642 group = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
1643 if (group != NULL) {
1644 field_bits = EC_GROUP_get_degree(group);
1645 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
1646 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
1650 # endif /* OPENSSL_NO_EC2M */
1653 if (group == NULL) {
1654 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1659 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED);
1661 if (ptmp->data_type != OSSL_PARAM_OCTET_STRING) {
1662 ERR_raise(ERR_LIB_EC, EC_R_INVALID_SEED);
1665 if (!EC_GROUP_set_seed(group, ptmp->data, ptmp->data_size))
1669 /* generator base point */
1670 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GENERATOR);
1672 || ptmp->data_type != OSSL_PARAM_OCTET_STRING) {
1673 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
1676 buf = (const unsigned char *)(ptmp->data);
1677 if ((point = EC_POINT_new(group)) == NULL)
1679 EC_GROUP_set_point_conversion_form(group,
1680 (point_conversion_form_t)buf[0] & ~0x01);
1681 if (!EC_POINT_oct2point(group, point, buf, ptmp->data_size, bnctx)) {
1682 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
1687 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ORDER);
1688 if (!OSSL_PARAM_get_BN(ptmp, &order)
1689 || (BN_is_negative(order) || BN_is_zero(order))
1690 || (BN_num_bits(order) > (int)field_bits + 1)) { /* Hasse bound */
1691 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
1695 /* Optional cofactor */
1696 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_COFACTOR);
1698 cofactor = BN_CTX_get(bnctx);
1699 if (cofactor == NULL || !OSSL_PARAM_get_BN(ptmp, &cofactor)) {
1700 ERR_raise(ERR_LIB_EC, EC_R_INVALID_COFACTOR);
1705 /* set the generator, order and cofactor (if present) */
1706 if (!EC_GROUP_set_generator(group, point, order, cofactor)) {
1707 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
1711 named_group = ec_group_explicit_to_named(group, libctx, propq, bnctx);
1712 if (named_group == NULL) {
1713 ERR_raise(ERR_LIB_EC, EC_R_INVALID_NAMED_GROUP_CONVERSION);
1716 if (named_group == group) {
1718 * If we did not find a named group then the encoding should be explicit
1719 * if it was specified
1721 ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ENCODING);
1723 && !ossl_ec_encoding_param2id(ptmp, &encoding_flag)) {
1724 ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
1727 if (encoding_flag == OPENSSL_EC_NAMED_CURVE) {
1728 ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
1731 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_EXPLICIT_CURVE);
1733 EC_GROUP_free(group);
1734 group = named_group;
1739 EC_GROUP_free(group);
1742 EC_POINT_free(point);
1747 #endif /* FIPS_MODULE */