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/* Copyright (C) 2022 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/abstract.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <string.h>
#include "contrib/string.h"
#include "libdnssec/binary.h"
#include "libdnssec/error.h"
#include "libdnssec/keyid.h"
#include "libdnssec/shared/keyid_gnutls.h"
#include "libdnssec/shared/shared.h"
/*!
* Get binary key ID from a key (public or private).
*/
static int keyid_bin(gnutls_x509_privkey_t key, gnutls_pubkey_t pubkey, dnssec_binary_t *id)
{
assert(key || pubkey);
assert(id);
// Flags can be used to enable SHA-2 since GnuTLS 3.4.7.
int flags = 0;
uint8_t buffer[DNSSEC_KEYID_BINARY_SIZE];
size_t size = DNSSEC_KEYID_SIZE;
int r = key ? gnutls_x509_privkey_get_key_id(key, flags, buffer, &size)
: gnutls_pubkey_get_key_id(pubkey, flags, buffer, &size);
if (r != GNUTLS_E_SUCCESS || size != DNSSEC_KEYID_BINARY_SIZE) {
return DNSSEC_INVALID_KEY_ID;
}
assert(size == DNSSEC_KEYID_BINARY_SIZE);
r = dnssec_binary_resize(id, size);
if (r != DNSSEC_EOK) {
return r;
}
memcpy(id->data, buffer, size);
return DNSSEC_EOK;
}
/*!
* Get hexadecimal key ID from a key (public or private).
*/
static int keyid_hex(gnutls_x509_privkey_t key, gnutls_pubkey_t pubkey, char **id)
{
_cleanup_binary_ dnssec_binary_t bin = { 0 };
int r = keyid_bin(key, pubkey, &bin);
if (r != DNSSEC_EOK) {
return r;
}
*id = bin_to_hex(bin.data, bin.size, false);
if (*id == NULL) {
return DNSSEC_ENOMEM;
}
return DNSSEC_EOK;
}
int keyid_x509(gnutls_x509_privkey_t key, dnssec_binary_t *id)
{
return keyid_bin(key, NULL, id);
}
int keyid_x509_hex(gnutls_x509_privkey_t key, char **id)
{
return keyid_hex(key, NULL, id);
}
int keyid_pubkey(gnutls_pubkey_t pubkey, dnssec_binary_t *id)
{
return keyid_bin(NULL, pubkey, id);
}
int keyid_pubkey_hex(gnutls_pubkey_t pubkey, char **id)
{
return keyid_hex(NULL, pubkey, id);
}
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