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/*
* Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include "ec_local.h"
#include <openssl/err.h>
int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only,
BN_CTX *ctx)
{
int nid;
BN_CTX *new_ctx = NULL;
if (group == NULL) {
ECerr(0, ERR_R_PASSED_NULL_PARAMETER);
return NID_undef;
}
if (ctx == NULL) {
ctx = new_ctx = BN_CTX_new_ex(NULL);
if (ctx == NULL) {
ECerr(0, ERR_R_MALLOC_FAILURE);
return NID_undef;
}
}
nid = ec_curve_nid_from_params(group, ctx);
if (nid > 0 && nist_only && EC_curve_nid2nist(nid) == NULL)
nid = NID_undef;
BN_CTX_free(new_ctx);
return nid;
}
int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
{
#ifdef FIPS_MODE
/*
* ECC domain parameter validation.
* See SP800-56A R3 5.5.2 "Assurances of Domain-Parameter Validity" Part 1b.
*/
return EC_GROUP_check_named_curve(group, 1, ctx) >= 0 ? 1 : 0;
#else
int ret = 0;
const BIGNUM *order;
BN_CTX *new_ctx = NULL;
EC_POINT *point = NULL;
if (group == NULL || group->meth == NULL) {
ECerr(EC_F_EC_GROUP_CHECK, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* Custom curves assumed to be correct */
if ((group->meth->flags & EC_FLAGS_CUSTOM_CURVE) != 0)
return 1;
if (ctx == NULL) {
ctx = new_ctx = BN_CTX_new();
if (ctx == NULL) {
ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
goto err;
}
}
/* check the discriminant */
if (!EC_GROUP_check_discriminant(group, ctx)) {
ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
goto err;
}
/* check the generator */
if (group->generator == NULL) {
ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
goto err;
}
if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
goto err;
}
/* check the order of the generator */
if ((point = EC_POINT_new(group)) == NULL)
goto err;
order = EC_GROUP_get0_order(group);
if (order == NULL)
goto err;
if (BN_is_zero(order)) {
ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
goto err;
}
if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
goto err;
if (!EC_POINT_is_at_infinity(group, point)) {
ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
goto err;
}
ret = 1;
err:
BN_CTX_free(new_ctx);
EC_POINT_free(point);
return ret;
#endif /* FIPS_MODE */
}
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