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 * ECC domain parameter validation.
28 * See SP800-56A R3 5.5.2 "Assurances of Domain-Parameter Validity" Part 1b.
30 return EC_GROUP_check_named_curve(group, 1) >= 0 ? 1 : 0;
34 BN_CTX *new_ctx = NULL;
35 EC_POINT *point = NULL;
37 if (group == NULL || group->meth == NULL) {
38 ECerr(EC_F_EC_GROUP_CHECK, ERR_R_PASSED_NULL_PARAMETER);
42 /* Custom curves assumed to be correct */
43 if ((group->meth->flags & EC_FLAGS_CUSTOM_CURVE) != 0)
47 ctx = new_ctx = BN_CTX_new();
49 ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
54 /* check the discriminant */
55 if (!EC_GROUP_check_discriminant(group, ctx)) {
56 ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
60 /* check the generator */
61 if (group->generator == NULL) {
62 ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
65 if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
66 ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
70 /* check the order of the generator */
71 if ((point = EC_POINT_new(group)) == NULL)
73 order = EC_GROUP_get0_order(group);
76 if (BN_is_zero(order)) {
77 ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
81 if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
83 if (!EC_POINT_is_at_infinity(group, point)) {
84 ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
94 #endif /* FIPS_MODE */