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diff --git a/src/libknot/sign/bnutils.h b/src/libknot/sign/bnutils.h
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+/*  Copyright (C) 2011 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 bnutils.h
+ *
+ * \author Jan Vcelak <jan.vcelak@nic.cz>
+ *
+ * \brief Conversion between Base64 and OpenSSL BIGNUM formats.
+ *
+ * \addtogroup dnssec
+ * @{
+ */
+
+#ifndef _KNOT_SIGN_BNUTILS_H_
+#define _KNOT_SIGN_BNUTILS_H_
+
+#include <openssl/bn.h>
+
+/*!
+ * \brief Convert Base64 encoded number into OpenSSL BIGNUM format.
+ *
+ * \param input  Base64 encoded input number
+ * \return Input number represented in OpenSSL BIGNUM format.
+ */
+BIGNUM *knot_b64_to_bignum(const char *input);
+
+#endif // _KNOT_SIGN_BNUTILS_H_
+
+/*! @} */