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-rw-r--r--src/libdnssec/shared/keyid_gnutls.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/src/libdnssec/shared/keyid_gnutls.c b/src/libdnssec/shared/keyid_gnutls.c
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+++ b/src/libdnssec/shared/keyid_gnutls.c
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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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <assert.h>
+#include <gnutls/abstract.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#include <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"
+#include "libdnssec/shared/hex.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 = alloca(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;
+ }
+
+ return bin_to_hex(&bin, id);
+}
+
+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);
+}