diff --git a/src/security/tpm/key-handle-osx.cpp b/src/security/tpm/key-handle-osx.cpp
new file mode 100644
index 0000000..518a673
--- /dev/null
+++ b/src/security/tpm/key-handle-osx.cpp
@@ -0,0 +1,57 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2016 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "key-handle-osx.hpp"
+#include "back-end-osx.hpp"
+
+namespace ndn {
+namespace security {
+namespace tpm {
+
+KeyHandleOsx::KeyHandleOsx(const BackEndOsx& impl, const KeyRefOsx& key)
+  : m_impl(impl)
+  , m_key(key)
+{
+  if (m_key.get() == 0)
+    BOOST_THROW_EXCEPTION(Error("key is not set"));
+}
+
+ConstBufferPtr
+KeyHandleOsx::doSign(DigestAlgorithm digestAlgorithm, const uint8_t* buf, size_t size) const
+{
+  return m_impl.sign(m_key, digestAlgorithm, buf, size);
+}
+
+ConstBufferPtr
+KeyHandleOsx::doDecrypt(const uint8_t* cipherText, size_t cipherTextLen) const
+{
+  return m_impl.decrypt(m_key, cipherText, cipherTextLen);
+}
+
+ConstBufferPtr
+KeyHandleOsx::doDerivePublicKey() const
+{
+  return m_impl.derivePublicKey(m_key);
+}
+
+} // namespace tpm
+} // namespace security
+} // namespace ndn