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diff --git a/src/libdnssec/keyid.h b/src/libdnssec/keyid.h
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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/>.
+*/
+/*!
+ * \file
+ *
+ * \addtogroup keyid
+ * 
+ * \brief DNSSEC key ID manipulation.
+ *
+ * The module contains auxiliary functions for manipulation with key IDs.
+ *
+ * Example:
+ *
+ * ~~~~~ {.c}
+ *
+ * char *key_id = "ef26672cafede0732dd18fba6488fa390b5589af";
+ * assert(dnssec_keyid_is_valid(key_id));
+ *
+ * char copy[DNSSEC_KEY_ID_SIZE + 1] = { 0 };
+ * memcpy(copy, key_id, sizeof(copy));
+ * for (int i = 0; i < DNSSEC_KEY_ID_SIZE; i++) {
+ *     copy[i] = toupper((unsigned char)copy[i]);
+ * }
+ *
+ * assert(dnssec_keyid_equal(key_id, copy));
+ *
+ * ~~~~~
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/*!
+ * Length of the key ID in presentation form (ASCII).
+ */
+#define DNSSEC_KEYID_SIZE 40
+
+/*!
+ * Length of the key ID in internal form (binary).
+ */
+#define DNSSEC_KEYID_BINARY_SIZE 20
+
+/*!
+ * Check if a provided string is a valid key ID string.
+ */
+bool dnssec_keyid_is_valid(const char *id);
+
+/*!
+ * Normalize the key ID string.
+ */
+void dnssec_keyid_normalize(char *id);
+
+/*!
+ * Create a normalized copy if the key ID.
+ */
+char *dnssec_keyid_copy(const char *id);
+
+/*!
+ * Check if two key IDs are equal.
+ */
+bool dnssec_keyid_equal(const char *one, const char *two);
+
+/*! @} */