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/* Copyright (C) 2016 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 <gnutls/abstract.h>
#include <gnutls/crypto.h>
#include "utils/common/cert.h"
#include "libknot/error.h"
static int spki_hash(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t alg,
uint8_t *hash, size_t size)
{
if (!cert || !hash || gnutls_hash_get_len(alg) != size) {
return KNOT_EINVAL;
}
gnutls_pubkey_t key = { 0 };
if (gnutls_pubkey_init(&key) != GNUTLS_E_SUCCESS) {
return KNOT_ENOMEM;
}
if (gnutls_pubkey_import_x509(key, cert, 0) != GNUTLS_E_SUCCESS) {
gnutls_pubkey_deinit(key);
return KNOT_ERROR;
}
gnutls_datum_t der = { 0 };
if (gnutls_pubkey_export2(key, GNUTLS_X509_FMT_DER, &der) != GNUTLS_E_SUCCESS) {
gnutls_pubkey_deinit(key);
return KNOT_ERROR;
}
int ret = gnutls_hash_fast(alg, der.data, der.size, hash);
gnutls_free(der.data);
gnutls_pubkey_deinit(key);
if (ret != GNUTLS_E_SUCCESS) {
return KNOT_ERROR;
}
return KNOT_EOK;
}
int cert_get_pin(gnutls_x509_crt_t cert, uint8_t *pin, size_t size)
{
return spki_hash(cert, GNUTLS_DIG_SHA256, pin, size);
}
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