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repertory2/librepertory2/include/utils/encryption.hpp
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repertory2/librepertory2/include/utils/encryption.hpp
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/*
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Copyright <2018-2024> <scott.e.graves@protonmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifndef INCLUDE_UTILS_ENCRYPTION_HPP_
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#define INCLUDE_UTILS_ENCRYPTION_HPP_
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#include "types/repertory.hpp"
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#include "utils/encrypting_reader.hpp"
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namespace repertory::utils::encryption {
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using reader_func = std::function<api_error(data_buffer &cypher_text,
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std::uint64_t start_offset,
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std::uint64_t end_offset)>;
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// Prototypes
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[[nodiscard]] auto decrypt_file_path(const std::string &encryption_token,
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std::string &file_path) -> api_error;
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[[nodiscard]] auto decrypt_file_name(const std::string &encryption_token,
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std::string &file_name) -> api_error;
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[[nodiscard]] auto generate_key(const std::string &encryption_token)
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-> key_type;
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[[nodiscard]] auto read_encrypted_range(const http_range &range,
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const key_type &key, reader_func reader,
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std::uint64_t total_size,
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data_buffer &data) -> api_error;
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// Implementations
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template <typename result>
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[[nodiscard]] inline auto decrypt_data(const key_type &key, const char *buffer,
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std::size_t buffer_size, result &res)
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-> bool {
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const auto header_size =
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static_cast<std::uint32_t>(encrypting_reader::get_header_size());
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if (buffer_size > header_size) {
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const std::uint32_t size =
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boost::endian::native_to_big(static_cast<std::uint32_t>(buffer_size));
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res.resize(buffer_size - header_size);
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return crypto_aead_xchacha20poly1305_ietf_decrypt_detached(
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reinterpret_cast<unsigned char *>(&res[0u]), nullptr,
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reinterpret_cast<const unsigned char *>(&buffer[header_size]),
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res.size(),
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reinterpret_cast<const unsigned char *>(
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&buffer[crypto_aead_xchacha20poly1305_IETF_NPUBBYTES]),
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reinterpret_cast<const unsigned char *>(&size), sizeof(size),
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reinterpret_cast<const unsigned char *>(buffer),
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key.data()) == 0;
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}
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return false;
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}
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template <typename buffer, typename result>
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[[nodiscard]] inline auto decrypt_data(const key_type &key, const buffer &buf,
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result &res) -> bool {
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return decrypt_data<result>(key, &buf[0u], buf.size(), res);
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}
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template <typename buffer, typename result>
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[[nodiscard]] inline auto decrypt_data(const std::string &encryption_token,
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const buffer &buf, result &res) -> bool {
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return decrypt_data<buffer, result>(generate_key(encryption_token), buf, res);
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}
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template <typename result>
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[[nodiscard]] inline auto decrypt_data(const std::string &encryption_token,
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const char *buffer,
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std::size_t buffer_size, result &res)
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-> bool {
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return decrypt_data<result>(generate_key(encryption_token), buffer,
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buffer_size, res);
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}
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template <typename result>
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inline void
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encrypt_data(const std::array<unsigned char,
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crypto_aead_xchacha20poly1305_IETF_NPUBBYTES> &iv,
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const key_type &key, const char *buffer, std::size_t buffer_size,
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result &res) {
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std::array<unsigned char, crypto_aead_xchacha20poly1305_IETF_ABYTES> mac{};
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const auto header_size =
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static_cast<std::uint32_t>(encrypting_reader::get_header_size());
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const std::uint32_t size = boost::endian::native_to_big(
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static_cast<std::uint32_t>(buffer_size + header_size));
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res.resize(buffer_size + header_size);
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unsigned long long mac_length{};
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if (crypto_aead_xchacha20poly1305_ietf_encrypt_detached(
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reinterpret_cast<unsigned char *>(&res[header_size]), mac.data(),
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&mac_length, reinterpret_cast<const unsigned char *>(buffer),
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buffer_size, reinterpret_cast<const unsigned char *>(&size),
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sizeof(size), nullptr, iv.data(), key.data()) != 0) {
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throw std::runtime_error("encryption failed");
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}
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std::memcpy(&res[0u], &iv[0u], iv.size());
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std::memcpy(&res[iv.size()], &mac[0u], mac.size());
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}
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template <typename result>
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inline void encrypt_data(const key_type &key, const char *buffer,
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std::size_t buffer_size, result &res) {
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std::array<unsigned char, crypto_aead_xchacha20poly1305_IETF_NPUBBYTES> iv{};
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randombytes_buf(iv.data(), iv.size());
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encrypt_data<result>(iv, key, buffer, buffer_size, res);
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}
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template <typename result>
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inline void encrypt_data(const std::string &encryption_token,
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const char *buffer, std::size_t buffer_size,
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result &res) {
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encrypt_data<result>(generate_key(encryption_token), buffer, buffer_size,
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res);
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}
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template <typename buffer, typename result>
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inline void encrypt_data(const std::string &encryption_token, const buffer &buf,
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result &res) {
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encrypt_data<result>(generate_key(encryption_token), &buf[0u], buf.size(),
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res);
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}
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template <typename buffer, typename result>
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inline void encrypt_data(const key_type &key, const buffer &buf, result &res) {
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encrypt_data<result>(key, &buf[0u], buf.size(), res);
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}
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template <typename buffer, typename result>
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inline void
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encrypt_data(const std::array<unsigned char,
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crypto_aead_xchacha20poly1305_IETF_NPUBBYTES> &iv,
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const key_type &key, const buffer &buf, result &res) {
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encrypt_data<result>(iv, key, &buf[0u], buf.size(), res);
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}
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} // namespace repertory::utils::encryption
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#endif // INCLUDE_UTILS_ENCRYPTION_HPP_
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