diff --git a/src/security/digest-sha256.cpp b/src/security/digest-sha256.cpp
new file mode 100644
index 0000000..6d450a2
--- /dev/null
+++ b/src/security/digest-sha256.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 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 "digest-sha256.hpp"
+
+namespace ndn {
+
+DigestSha256::DigestSha256()
+  : Signature(SignatureInfo(Tlv::DigestSha256))
+{
+}
+
+DigestSha256::DigestSha256(const Signature& signature)
+  : Signature(signature)
+{
+  if (getType() != Tlv::DigestSha256)
+    throw Error("Incorrect signature type");
+}
+
+} // namespace ndn