1 files changed, 61 insertions, 0 deletions
diff --git a/src/utils/common/cert.c b/src/utils/common/cert.c
new file mode 100644
index 0000000..1b76b23
--- /dev/null
+++ b/src/utils/common/cert.c
@@ -0,0 +1,61 @@
+/*  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);
+}