1 files changed, 87 insertions, 0 deletions
diff --git a/src/libdnssec/keyid.c b/src/libdnssec/keyid.c
new file mode 100644
index 0000000..5a6f29d
--- /dev/null
+++ b/src/libdnssec/keyid.c
@@ -0,0 +1,87 @@
+/*  Copyright (C) 2019 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 <string.h>
+
+#include "libdnssec/error.h"
+#include "libdnssec/keyid.h"
+#include "libdnssec/shared/shared.h"
+
+#include "contrib/ctype.h"
+#include "contrib/tolower.h"
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+bool dnssec_keyid_is_valid(const char *id)
+{
+	if (!id) {
+		return false;
+	}
+
+	if (strlen(id) % 2 != 0) {
+		return false;
+	}
+
+	for (int i = 0; id[i] != '\0'; i++) {
+		if (!is_xdigit(id[i])) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+_public_
+void dnssec_keyid_normalize(char *id)
+{
+	if (!id) {
+		return;
+	}
+
+	for (size_t i = 0; id[i] != '\0'; i++) {
+		assert(id[i] != '\0' && is_xdigit(id[i]));
+		id[i] = knot_tolower(id[i]);
+	}
+}
+
+_public_
+char *dnssec_keyid_copy(const char *id)
+{
+	if (!id) {
+		return NULL;
+	}
+
+	char *copy = strdup(id);
+	if (!copy) {
+		return NULL;
+	}
+
+	dnssec_keyid_normalize(copy);
+
+	return copy;
+}
+
+_public_
+bool dnssec_keyid_equal(const char *one, const char *two)
+{
+	if (!one || !two) {
+		return NULL;
+	}
+
+	return (strcasecmp(one, two) == 0);
+}