security: Reorganizing source code to prepare for support of two version of NDN certificates

This commit also removes unused ndn_digestSha256 function and deprecates
crypto::sha256 in favor of crypto::computeSha256Digest in util/crypto.hpp.

Change-Id: I24ee50ff073a96b868633bdf2cfade412d3605f3
Refs: #3098
diff --git a/src/security/v1/cryptopp.hpp b/src/security/v1/cryptopp.hpp
new file mode 100644
index 0000000..4de66bb
--- /dev/null
+++ b/src/security/v1/cryptopp.hpp
@@ -0,0 +1,45 @@
+/* -*- 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.
+ */
+
+#ifndef NDN_SECURITY_V1_CRYPTOPP_HPP
+#define NDN_SECURITY_V1_CRYPTOPP_HPP
+
+// suppress CryptoPP warnings
+#pragma GCC system_header
+#pragma clang system_header
+
+#include <cryptopp/asn.h>
+#include <cryptopp/base64.h>
+#include <cryptopp/des.h>
+#include <cryptopp/files.h>
+#include <cryptopp/filters.h>
+#include <cryptopp/hex.h>
+#include <cryptopp/modes.h>
+#include <cryptopp/osrng.h>
+#include <cryptopp/pssr.h>
+#include <cryptopp/pwdbased.h>
+#include <cryptopp/rsa.h>
+#include <cryptopp/sha.h>
+#include <cryptopp/eccrypto.h>
+#include <cryptopp/oids.h>
+#include <cryptopp/dsa.h>
+
+#endif // NDN_SECURITY_V1_CRYPTOPP_HPP