| /* -*- 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 "verifier-filter.hpp" |
| #include "public-key.hpp" |
| #include "../detail/openssl-helper.hpp" |
| |
| #include <boost/lexical_cast.hpp> |
| |
| namespace ndn { |
| namespace security { |
| namespace transform { |
| |
| class VerifierFilter::Impl |
| { |
| public: |
| Impl(const uint8_t* sig, size_t siglen) |
| : sig(sig) |
| , siglen(siglen) |
| { |
| } |
| |
| public: |
| detail::EvpMdCtx ctx; |
| const uint8_t* sig; |
| size_t siglen; |
| }; |
| |
| |
| VerifierFilter::VerifierFilter(DigestAlgorithm algo, const PublicKey& key, |
| const uint8_t* sig, size_t sigLen) |
| : m_impl(make_unique<Impl>(sig, sigLen)) |
| { |
| const EVP_MD* md = detail::digestAlgorithmToEvpMd(algo); |
| if (md == nullptr) |
| BOOST_THROW_EXCEPTION(Error(getIndex(), "Unsupported digest algorithm " + |
| boost::lexical_cast<std::string>(algo))); |
| |
| if (EVP_DigestVerifyInit(m_impl->ctx, nullptr, md, nullptr, |
| reinterpret_cast<EVP_PKEY*>(key.getEvpPkey())) != 1) |
| BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to initialize verification context with " + |
| boost::lexical_cast<std::string>(algo) + " digest and " + |
| boost::lexical_cast<std::string>(key.getKeyType()) + " key")); |
| } |
| |
| VerifierFilter::~VerifierFilter() = default; |
| |
| size_t |
| VerifierFilter::convert(const uint8_t* buf, size_t size) |
| { |
| if (EVP_DigestVerifyUpdate(m_impl->ctx, buf, size) != 1) |
| BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to accept more input")); |
| |
| return size; |
| } |
| |
| void |
| VerifierFilter::finalize() |
| { |
| int res = EVP_DigestVerifyFinal(m_impl->ctx, |
| #if OPENSSL_VERSION_NUMBER < 0x1000200fL |
| const_cast<uint8_t*>(m_impl->sig), |
| #else |
| m_impl->sig, |
| #endif |
| m_impl->siglen); |
| |
| auto buffer = make_unique<OBuffer>(1); |
| (*buffer)[0] = (res == 1) ? 1 : 0; |
| setOutputBuffer(std::move(buffer)); |
| |
| flushAllOutput(); |
| } |
| |
| unique_ptr<Transform> |
| verifierFilter(DigestAlgorithm algo, const PublicKey& key, |
| const uint8_t* sig, size_t sigLen) |
| { |
| return make_unique<VerifierFilter>(algo, key, sig, sigLen); |
| } |
| |
| } // namespace transform |
| } // namespace security |
| } // namespace ndn |