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/*
* Copyright (C) 2020 Red Hat, Inc.
*
* Author: Daiki Ueno
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "config.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include "utils.h"
#define MAX_BUF 1024
static gnutls_fips140_context_t fips_context;
static void test_hkdf(gnutls_mac_algorithm_t mac, const char *ikm_hex,
const char *salt_hex, const char *info_hex, size_t length,
const char *prk_hex, const char *okm_hex)
{
gnutls_datum_t hex;
gnutls_datum_t ikm;
gnutls_datum_t salt;
gnutls_datum_t info;
gnutls_datum_t prk;
gnutls_datum_t okm;
uint8_t buf[MAX_BUF];
success("HKDF test with %s\n", gnutls_mac_get_name(mac));
/* Test HKDF-Extract */
hex.data = (void *)ikm_hex;
hex.size = strlen(ikm_hex);
assert(gnutls_hex_decode2(&hex, &ikm) >= 0);
hex.data = (void *)salt_hex;
hex.size = strlen(salt_hex);
assert(gnutls_hex_decode2(&hex, &salt) >= 0);
FIPS_PUSH_CONTEXT();
assert(gnutls_hkdf_extract(mac, &ikm, &salt, buf) >= 0);
/* HKDF outside of TLS usage is not approved */
FIPS_POP_CONTEXT(NOT_APPROVED);
gnutls_free(ikm.data);
gnutls_free(salt.data);
prk.data = buf;
prk.size = strlen(prk_hex) / 2;
assert(gnutls_hex_encode2(&prk, &hex) >= 0);
if (strcmp((char *)hex.data, prk_hex))
fail("prk doesn't match: %s != %s\n", (char *)hex.data,
prk_hex);
gnutls_free(hex.data);
/* Test HKDF-Expand */
hex.data = (void *)info_hex;
hex.size = strlen(info_hex);
assert(gnutls_hex_decode2(&hex, &info) >= 0);
FIPS_PUSH_CONTEXT();
assert(gnutls_hkdf_expand(mac, &prk, &info, buf,
gnutls_hmac_get_len(mac) * 256) ==
GNUTLS_E_INVALID_REQUEST);
FIPS_POP_CONTEXT(ERROR);
FIPS_PUSH_CONTEXT();
assert(gnutls_hkdf_expand(mac, &prk, &info, buf, length) >= 0);
/* HKDF outside of TLS usage is not approved */
FIPS_POP_CONTEXT(NOT_APPROVED);
gnutls_free(info.data);
okm.data = buf;
okm.size = strlen(okm_hex) / 2;
assert(gnutls_hex_encode2(&okm, &hex) >= 0);
if (strcmp((char *)hex.data, okm_hex))
fail("okm doesn't match: %s != %s\n", (char *)hex.data,
okm_hex);
gnutls_free(hex.data);
}
inline static bool
is_mac_algo_hmac_approved_in_fips(gnutls_mac_algorithm_t algo)
{
switch (algo) {
case GNUTLS_MAC_SHA1:
case GNUTLS_MAC_SHA256:
case GNUTLS_MAC_SHA384:
case GNUTLS_MAC_SHA512:
case GNUTLS_MAC_SHA224:
case GNUTLS_MAC_SHA3_224:
case GNUTLS_MAC_SHA3_256:
case GNUTLS_MAC_SHA3_384:
case GNUTLS_MAC_SHA3_512:
return true;
default:
return false;
}
}
static void test_pbkdf2(gnutls_mac_algorithm_t mac, const char *ikm_hex,
const char *salt_hex, unsigned iter_count,
size_t length, const char *okm_hex,
gnutls_fips140_operation_state_t expected_state)
{
gnutls_datum_t hex;
gnutls_datum_t ikm;
gnutls_datum_t salt;
gnutls_datum_t okm;
uint8_t buf[MAX_BUF];
success("PBKDF2 test with %s\n", gnutls_mac_get_name(mac));
hex.data = (void *)ikm_hex;
hex.size = strlen(ikm_hex);
assert(gnutls_hex_decode2(&hex, &ikm) >= 0);
hex.data = (void *)salt_hex;
hex.size = strlen(salt_hex);
assert(gnutls_hex_decode2(&hex, &salt) >= 0);
fips_push_context(fips_context);
assert(gnutls_pbkdf2(mac, &ikm, &salt, iter_count, buf, length) >= 0);
fips_pop_context(fips_context, expected_state);
gnutls_free(ikm.data);
gnutls_free(salt.data);
okm.data = buf;
okm.size = length;
assert(gnutls_hex_encode2(&okm, &hex) >= 0);
if (strcmp((char *)hex.data, okm_hex))
fail("okm doesn't match: %s != %s\n", (char *)hex.data,
okm_hex);
gnutls_free(hex.data);
}
void doit(void)
{
assert(gnutls_fips140_context_init(&fips_context) >= 0);
/* Test vector from RFC 5869. More thorough testing is done
* in nettle. */
test_hkdf(GNUTLS_MAC_SHA256,
"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"
"0b0b0b0b0b0b",
"000102030405060708090a0b0c", "f0f1f2f3f4f5f6f7f8f9", 42,
"077709362c2e32df0ddc3f0dc47bba63"
"90b6c73bb50f9c3122ec844ad7c2b3e5",
"3cb25f25faacd57a90434f64d0362f2a"
"2d2d0a90cf1a5a4c5db02d56ecc4c5bf"
"34007208d5b887185865");
/* Test vector from RFC 6070. More thorough testing is done
* in nettle. */
test_pbkdf2(
GNUTLS_MAC_SHA1, "70617373776f7264", /* "password" */
"73616c74", /* "salt" */
4096, 20, "4b007901b765489abead49d926f721d065a429c1",
/* Key sizes and output sizes less than 112-bit are not approved. */
GNUTLS_FIPS140_OP_NOT_APPROVED);
test_pbkdf2(GNUTLS_MAC_AES_CMAC_128,
"70617373776f726470617373776f7264", /* "passwordpassword" */
"73616c74", /* "salt" */
4096, 20, "c4c112c6e1e3b8757640603dec78825ff87605a7",
/* Use of AES-CMAC in PBKDF2 is not supported in ACVP. */
GNUTLS_FIPS140_OP_NOT_APPROVED);
gnutls_fips140_context_deinit(fips_context);
}
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