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/*
* Copyright (C) 2019 Red Hat, Inc.
*
* Author: Simo Sorce
*
* This file is part of GnuTLS.
*
* GnuTLS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuTLS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GnuTLS; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* This program tests functionality of DH exchanges */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gnutls/gnutls.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include "utils.h"
#ifdef ENABLE_FIPS140
int _gnutls_dh_generate_key(gnutls_dh_params_t dh_params,
gnutls_datum_t *priv_key, gnutls_datum_t *pub_key);
int _gnutls_dh_compute_key(gnutls_dh_params_t dh_params,
const gnutls_datum_t *priv_key,
const gnutls_datum_t *pub_key,
const gnutls_datum_t *peer_key, gnutls_datum_t *Z);
static void params(gnutls_dh_params_t *dh_params, const gnutls_datum_t *p,
const gnutls_datum_t *q, const gnutls_datum_t *g)
{
int ret;
ret = gnutls_dh_params_init(dh_params);
if (ret != 0)
fail("error\n");
ret = gnutls_dh_params_import_raw3(*dh_params, p, q, g);
if (ret != 0)
fail("error\n");
}
static void genkey(const gnutls_dh_params_t dh_params,
gnutls_datum_t *priv_key, gnutls_datum_t *pub_key)
{
int ret;
ret = _gnutls_dh_generate_key(dh_params, priv_key, pub_key);
if (ret != 0)
fail("error\n");
}
static void compute_key(const char *name, const gnutls_dh_params_t dh_params,
const gnutls_datum_t *priv_key, const gnutls_datum_t *pub_key,
const gnutls_datum_t *peer_key, int expect_error,
gnutls_datum_t *result, bool expect_success)
{
gnutls_datum_t Z = { 0 };
bool success;
int ret;
ret = _gnutls_dh_compute_key(dh_params, priv_key, pub_key,
peer_key, &Z);
if (expect_error != ret)
fail("%s: error %d (expected %d)\n", name, ret, expect_error);
if (result) {
success = (Z.size != result->size &&
memcmp(Z.data, result->data, Z.size));
if (success != expect_success)
fail("%s: failed to match result\n", name);
}
gnutls_free(Z.data);
}
struct dh_test_data {
const char *name;
const gnutls_datum_t prime;
const gnutls_datum_t q;
const gnutls_datum_t generator;
const gnutls_datum_t peer_key;
int expected_error;
};
void doit(void)
{
struct dh_test_data test_data[] = {
{
"[y == 0]",
gnutls_ffdhe_2048_group_prime,
gnutls_ffdhe_2048_group_q,
gnutls_ffdhe_2048_group_generator,
{ (void *)"\x00", 1 },
GNUTLS_E_MPI_SCAN_FAILED
},
{
"[y < 2]",
gnutls_ffdhe_2048_group_prime,
gnutls_ffdhe_2048_group_q,
gnutls_ffdhe_2048_group_generator,
{ (void *)"\x01", 1 },
GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER
},
{
"[y > p - 2]",
gnutls_ffdhe_2048_group_prime,
gnutls_ffdhe_2048_group_q,
gnutls_ffdhe_2048_group_generator,
gnutls_ffdhe_2048_group_prime,
GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER
},
{
"[y ^ q mod p == 1]",
gnutls_ffdhe_2048_group_prime,
gnutls_ffdhe_2048_group_q,
gnutls_ffdhe_2048_group_generator,
gnutls_ffdhe_2048_group_q,
GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER
},
{
"Legal Input",
gnutls_ffdhe_2048_group_prime,
gnutls_ffdhe_2048_group_q,
gnutls_ffdhe_2048_group_generator,
{ (void *)"\x02", 1 },
0
},
{ NULL }
};
for (int i = 0; test_data[i].name != NULL; i++) {
gnutls_datum_t priv_key, pub_key;
gnutls_dh_params_t dh_params;
params(&dh_params, &test_data[i].prime, &test_data[i].q,
&test_data[i].generator);
genkey(dh_params, &priv_key, &pub_key);
compute_key(test_data[i].name, dh_params, &priv_key,
&pub_key, &test_data[i].peer_key,
test_data[i].expected_error, NULL, 0);
gnutls_dh_params_deinit(dh_params);
gnutls_free(priv_key.data);
gnutls_free(pub_key.data);
}
success("all ok\n");
}
#else
void doit(void)
{
return;
}
#endif
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