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diff --git a/daemons/ipa-slapi-plugins/libotp/librfc.h b/daemons/ipa-slapi-plugins/libotp/librfc.h
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+++ b/daemons/ipa-slapi-plugins/libotp/librfc.h
@@ -0,0 +1,63 @@
+/** BEGIN COPYRIGHT BLOCK
+ * 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/>.
+ *
+ * Additional permission under GPLv3 section 7:
+ *
+ * In the following paragraph, "GPL" means the GNU General Public
+ * License, version 3 or any later version, and "Non-GPL Code" means
+ * code that is governed neither by the GPL nor a license
+ * compatible with the GPL.
+ *
+ * You may link the code of this Program with Non-GPL Code and convey
+ * linked combinations including the two, provided that such Non-GPL
+ * Code only links to the code of this Program through those well
+ * defined interfaces identified in the file named EXCEPTION found in
+ * the source code files (the "Approved Interfaces"). The files of
+ * Non-GPL Code may instantiate templates or use macros or inline
+ * functions from the Approved Interfaces without causing the resulting
+ * work to be covered by the GPL. Only the copyright holders of this
+ * Program may make changes or additions to the list of Approved
+ * Interfaces.
+ *
+ * Authors:
+ * Nathaniel McCallum <npmccallum@redhat.com>
+ *
+ * Copyright (C) 2013 Red Hat, Inc.
+ * All rights reserved.
+ * END COPYRIGHT BLOCK **/
+
+#ifndef LIBRFC_H_
+#define LIBRFC_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+struct hotp_token_key {
+    uint8_t *bytes;
+    size_t len;
+};
+
+struct hotp_token {
+    struct hotp_token_key key;
+    char *algo;
+    int digits;
+};
+
+/*
+ * An implementation of HOTP (RFC 4226).
+ */
+bool hotp(const struct hotp_token *token, uint64_t counter, uint32_t *out);
+
+#endif /* LIBRFC_H_ */