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diff --git a/src/lib/util/encode/base32hex.h b/src/lib/util/encode/base32hex.h
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+++ b/src/lib/util/encode/base32hex.h
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+// Copyright (C) 2009-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef BASE32HEX_H
+#define BASE32HEX_H 1
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+//
+// Note: this helper module isn't specific to the DNS protocol per se.
+// We should probably move this to somewhere else, possibly in some common
+// utility area.
+//
+
+namespace isc {
+namespace util {
+namespace encode {
+
+/// \brief Encode binary data in the base32hex format.
+///
+/// The underlying implementation is shared with \c encodeBase64, and all
+/// description except the format (base32hex) equally applies.
+///
+/// Note: the encoding format is base32hex, not base32.
+///
+/// \param binary A vector object storing the data to be encoded. 
+/// \return A newly created string that stores base32hex encoded value for
+/// binary.
+std::string encodeBase32Hex(const std::vector<uint8_t>& binary);
+
+/// \brief Decode a text encoded in the base32hex format into the
+/// original %data.
+///
+/// The underlying implementation is shared with \c decodeBase64, and all
+/// description except the format (base32hex) equally applies.
+///
+/// Note: the encoding format is base32hex, not base32.
+///
+/// \param input A text encoded in the base32hex format.
+/// \param result A vector in which the decoded %data is to be stored.
+void decodeBase32Hex(const std::string& input, std::vector<uint8_t>& result);
+
+} // namespace encode 
+} // namespace util
+} // namespace isc
+
+#endif  // BASE32HEX_H
+
+// Local Variables:
+// mode: c++
+// End: