diff --git a/src/detail/util.hpp b/src/detail/util.hpp
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--- /dev/null
+++ b/src/detail/util.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2018,  The University of Memphis
+ *
+ * This file is part of PSync.
+ * See AUTHORS.md for complete list of PSync authors and contributors.
+ *
+ * PSync 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.
+ *
+ * PSync 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
+ * PSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * murmurHash3 was written by Austin Appleby, and is placed in the public
+ * domain. The author hereby disclaims copyright to this source code.
+ * https://github.com/aappleby/smhasher/blob/master/src/murmurHash3.cpp
+ **/
+
+#ifndef PSYNC_UTIL_HPP
+#define PSYNC_UTIL_HPP
+
+#include <ndn-cxx/name.hpp>
+
+#include <inttypes.h>
+#include <vector>
+#include <string>
+
+namespace psync {
+
+uint32_t
+murmurHash3(uint32_t nHashSeed, const std::vector<unsigned char>& vDataToHash);
+
+uint32_t
+murmurHash3(uint32_t nHashSeed, const std::string& str);
+
+uint32_t
+murmurHash3(uint32_t nHashSeed, uint32_t value);
+
+struct MissingDataInfo
+{
+  ndn::Name prefix;
+  uint64_t lowSeq;
+  uint64_t highSeq;
+};
+
+} // namespace psync
+
+#endif // PSYNC_UTIL_HPP