util: rename digest.hpp to sha256.hpp
The new file name matches the Sha256 class included within.
This commit also deletes deprecated crypto.hpp.
refs #3940
Change-Id: Ib9bbcd0ba087b812bb0886ceaea116689d4633f5
diff --git a/src/util/sha256.cpp b/src/util/sha256.cpp
new file mode 100644
index 0000000..7aeea64
--- /dev/null
+++ b/src/util/sha256.cpp
@@ -0,0 +1,152 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2017 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 "sha256.hpp"
+#include "string-helper.hpp"
+#include "../security/detail/openssl.hpp"
+#include "../security/transform/digest-filter.hpp"
+#include "../security/transform/stream-sink.hpp"
+#include "../security/transform/stream-source.hpp"
+
+namespace ndn {
+namespace util {
+
+const size_t Sha256::DIGEST_SIZE;
+
+Sha256::Sha256()
+{
+ reset();
+}
+
+Sha256::Sha256(std::istream& is)
+ : m_output(make_unique<OBufferStream>())
+ , m_isEmpty(false)
+ , m_isFinalized(true)
+{
+ namespace tr = security::transform;
+
+ tr::streamSource(is) >> tr::digestFilter(DigestAlgorithm::SHA256) >> tr::streamSink(*m_output);
+}
+
+void
+Sha256::reset()
+{
+ namespace tr = security::transform;
+
+ m_input = make_unique<tr::StepSource>();
+ m_output = make_unique<OBufferStream>();
+ m_isEmpty = true;
+ m_isFinalized = false;
+
+ *m_input >> tr::digestFilter(DigestAlgorithm::SHA256) >> tr::streamSink(*m_output);
+}
+
+ConstBufferPtr
+Sha256::computeDigest()
+{
+ if (!m_isFinalized) {
+ BOOST_ASSERT(m_input != nullptr);
+ m_input->end();
+ m_isFinalized = true;
+ }
+
+ return m_output->buf();
+}
+
+bool
+Sha256::operator==(Sha256& digest)
+{
+ const Buffer& lhs = *computeDigest();
+ const Buffer& rhs = *digest.computeDigest();
+
+ if (lhs.size() != rhs.size()) {
+ return false;
+ }
+
+ // constant-time buffer comparison to mitigate timing attacks
+ return CRYPTO_memcmp(lhs.get(), rhs.get(), lhs.size()) == 0;
+}
+
+Sha256&
+Sha256::operator<<(Sha256& src)
+{
+ auto buf = src.computeDigest();
+ update(buf->get(), buf->size());
+ return *this;
+}
+
+Sha256&
+Sha256::operator<<(const std::string& str)
+{
+ update(reinterpret_cast<const uint8_t*>(str.data()), str.size());
+ return *this;
+}
+
+Sha256&
+Sha256::operator<<(const Block& block)
+{
+ update(block.wire(), block.size());
+ return *this;
+}
+
+Sha256&
+Sha256::operator<<(uint64_t value)
+{
+ update(reinterpret_cast<const uint8_t*>(&value), sizeof(uint64_t));
+ return *this;
+}
+
+void
+Sha256::update(const uint8_t* buffer, size_t size)
+{
+ if (m_isFinalized)
+ BOOST_THROW_EXCEPTION(Error("Digest has been already finalized"));
+
+ BOOST_ASSERT(m_input != nullptr);
+ m_input->write(buffer, size);
+ m_isEmpty = false;
+}
+
+std::string
+Sha256::toString()
+{
+ auto buf = computeDigest();
+ return toHex(*buf);
+}
+
+ConstBufferPtr
+Sha256::computeDigest(const uint8_t* buffer, size_t size)
+{
+ Sha256 sha256;
+ sha256.update(buffer, size);
+ return sha256.computeDigest();
+}
+
+std::ostream&
+operator<<(std::ostream& os, Sha256& digest)
+{
+ auto buf = digest.computeDigest();
+ printHex(os, *buf);
+ return os;
+}
+
+} // namespace util
+} // namespace ndn