Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 1 | /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
Davide Pesavento | 8703953 | 2017-09-16 15:15:39 -0400 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2013-2017 Regents of the University of California. |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 4 | * |
| 5 | * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions). |
| 6 | * |
| 7 | * ndn-cxx library is free software: you can redistribute it and/or modify it under the |
| 8 | * terms of the GNU Lesser General Public License as published by the Free Software |
| 9 | * Foundation, either version 3 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY |
| 12 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
| 13 | * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received copies of the GNU General Public License and GNU Lesser |
| 16 | * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see |
| 17 | * <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | * See AUTHORS.md for complete list of ndn-cxx authors and contributors. |
| 20 | */ |
| 21 | |
| 22 | #include "hmac-filter.hpp" |
| 23 | #include "../detail/openssl-helper.hpp" |
| 24 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 25 | #include <boost/lexical_cast.hpp> |
| 26 | |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 27 | namespace ndn { |
| 28 | namespace security { |
| 29 | namespace transform { |
| 30 | |
| 31 | class HmacFilter::Impl |
| 32 | { |
| 33 | public: |
Davide Pesavento | 3504cc4 | 2017-09-17 15:28:10 -0400 | [diff] [blame] | 34 | Impl() |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 35 | : key(nullptr) |
| 36 | { |
Alexander Afanasyev | 02948ec | 2016-09-12 18:04:50 -0700 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | ~Impl() |
| 40 | { |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 41 | EVP_PKEY_free(key); |
Alexander Afanasyev | 02948ec | 2016-09-12 18:04:50 -0700 | [diff] [blame] | 42 | } |
| 43 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 44 | public: |
Davide Pesavento | 3504cc4 | 2017-09-17 15:28:10 -0400 | [diff] [blame] | 45 | detail::EvpMdCtx ctx; |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 46 | EVP_PKEY* key; |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
Davide Pesavento | 8aad372 | 2017-09-16 20:57:28 -0400 | [diff] [blame] | 49 | |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 50 | HmacFilter::HmacFilter(DigestAlgorithm algo, const uint8_t* key, size_t keyLen) |
Davide Pesavento | 8aad372 | 2017-09-16 20:57:28 -0400 | [diff] [blame] | 51 | : m_impl(make_unique<Impl>()) |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 52 | { |
| 53 | BOOST_ASSERT(key != nullptr); |
| 54 | BOOST_ASSERT(keyLen > 0); |
| 55 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 56 | const EVP_MD* md = detail::digestAlgorithmToEvpMd(algo); |
| 57 | if (md == nullptr) |
| 58 | BOOST_THROW_EXCEPTION(Error(getIndex(), "Unsupported digest algorithm " + |
| 59 | boost::lexical_cast<std::string>(algo))); |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 60 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 61 | m_impl->key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, nullptr, key, static_cast<int>(keyLen)); |
| 62 | if (m_impl->key == nullptr) |
| 63 | BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to create HMAC key")); |
| 64 | |
| 65 | if (EVP_DigestSignInit(m_impl->ctx, nullptr, md, nullptr, m_impl->key) != 1) |
| 66 | BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to initialize HMAC context with " + |
| 67 | boost::lexical_cast<std::string>(algo) + " digest")); |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Davide Pesavento | 8aad372 | 2017-09-16 20:57:28 -0400 | [diff] [blame] | 70 | HmacFilter::~HmacFilter() = default; |
| 71 | |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 72 | size_t |
| 73 | HmacFilter::convert(const uint8_t* buf, size_t size) |
| 74 | { |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 75 | if (EVP_DigestSignUpdate(m_impl->ctx, buf, size) != 1) |
| 76 | BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to accept more input")); |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 77 | |
| 78 | return size; |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | HmacFilter::finalize() |
| 83 | { |
| 84 | auto buffer = make_unique<OBuffer>(EVP_MAX_MD_SIZE); |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 85 | size_t hmacLen = 0; |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 86 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 87 | if (EVP_DigestSignFinal(m_impl->ctx, buffer->data(), &hmacLen) != 1) |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 88 | BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to finalize HMAC")); |
| 89 | |
Davide Pesavento | 9219f58 | 2017-09-17 13:58:29 -0400 | [diff] [blame] | 90 | buffer->erase(buffer->begin() + hmacLen, buffer->end()); |
Yingdi Yu | d12fb97 | 2015-08-01 17:38:49 -0700 | [diff] [blame] | 91 | setOutputBuffer(std::move(buffer)); |
| 92 | |
| 93 | flushAllOutput(); |
| 94 | } |
| 95 | |
| 96 | unique_ptr<Transform> |
| 97 | hmacFilter(DigestAlgorithm algo, const uint8_t* key, size_t keyLen) |
| 98 | { |
| 99 | return make_unique<HmacFilter>(algo, key, keyLen); |
| 100 | } |
| 101 | |
| 102 | } // namespace transform |
| 103 | } // namespace security |
| 104 | } // namespace ndn |