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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <string.h>
#include "libdnssec/error.h"
#include "libdnssec/nsec.h"
#include "libdnssec/shared/shared.h"
/*!
* Compute NSEC3 hash for given data and algorithm.
*
* \see RFC 5155
*
* \todo Input data should be converted to lowercase.
*/
static int nsec3_hash(gnutls_digest_algorithm_t algorithm, int iterations,
const dnssec_binary_t *salt, const dnssec_binary_t *data,
dnssec_binary_t *hash)
{
assert(salt);
assert(data);
assert(hash);
int hash_size = gnutls_hash_get_len(algorithm);
if (hash_size <= 0) {
return DNSSEC_NSEC3_HASHING_ERROR;
}
int result = dnssec_binary_resize(hash, hash_size);
if (result != DNSSEC_EOK) {
return result;
}
_cleanup_hash_ gnutls_hash_hd_t digest = NULL;
result = gnutls_hash_init(&digest, algorithm);
if (result < 0) {
return DNSSEC_NSEC3_HASHING_ERROR;
}
const uint8_t *in = data->data;
size_t in_size = data->size;
for (int i = 0; i <= iterations; i++) {
result = gnutls_hash(digest, in, in_size);
if (result < 0) {
return DNSSEC_NSEC3_HASHING_ERROR;
}
result = gnutls_hash(digest, salt->data, salt->size);
if (result < 0) {
return DNSSEC_NSEC3_HASHING_ERROR;
}
gnutls_hash_output(digest, hash->data);
in = hash->data;
in_size = hash->size;
}
return DNSSEC_EOK;
}
/*!
* Get GnuTLS digest algorithm from DNSSEC algorithm number.
*/
static gnutls_digest_algorithm_t algorithm_d2g(dnssec_nsec3_algorithm_t dnssec)
{
switch (dnssec) {
case DNSSEC_NSEC3_ALGORITHM_SHA1: return GNUTLS_DIG_SHA1;
default: return GNUTLS_DIG_UNKNOWN;
}
}
/* -- public API ----------------------------------------------------------- */
/*!
* Compute NSEC3 hash for given data.
*/
_public_
int dnssec_nsec3_hash(const dnssec_binary_t *data,
const dnssec_nsec3_params_t *params,
dnssec_binary_t *hash)
{
if (!data || !params || !hash) {
return DNSSEC_EINVAL;
}
gnutls_digest_algorithm_t algorithm = algorithm_d2g(params->algorithm);
if (algorithm == GNUTLS_DIG_UNKNOWN) {
return DNSSEC_INVALID_NSEC3_ALGORITHM;
}
return nsec3_hash(algorithm, params->iterations, ¶ms->salt, data, hash);
}
/*!
* Get length of raw NSEC3 hash for a given algorithm.
*/
_public_
size_t dnssec_nsec3_hash_length(dnssec_nsec3_algorithm_t algorithm)
{
gnutls_digest_algorithm_t gnutls = algorithm_d2g(algorithm);
if (gnutls == GNUTLS_DIG_UNKNOWN) {
return 0;
}
return gnutls_hash_get_len(gnutls);
}
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