2 * Copyright 2002-2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include <openssl/err.h>
13 int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only)
17 nid = ec_curve_nid_from_params(group);
18 if (nid > 0 && nist_only && EC_curve_nid2nist(nid) == NULL)
23 int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
27 BN_CTX *new_ctx = NULL;
28 EC_POINT *point = NULL;
30 if (group == NULL || group->meth == NULL) {
31 ECerr(EC_F_EC_GROUP_CHECK, ERR_R_PASSED_NULL_PARAMETER);
35 /* Custom curves assumed to be correct */
36 if ((group->meth->flags & EC_FLAGS_CUSTOM_CURVE) != 0)
40 ctx = new_ctx = BN_CTX_new();
42 ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
47 /* check the discriminant */
48 if (!EC_GROUP_check_discriminant(group, ctx)) {
49 ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
53 /* check the generator */
54 if (group->generator == NULL) {
55 ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
58 if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
59 ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
63 /* check the order of the generator */
64 if ((point = EC_POINT_new(group)) == NULL)
66 order = EC_GROUP_get0_order(group);
69 if (BN_is_zero(order)) {
70 ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
74 if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
76 if (!EC_POINT_is_at_infinity(group, point)) {
77 ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);