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// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "AES tools" project.
// For details, see https://github.com/egor-tensin/aes-tools.
// Distributed under the MIT License.
#include "file_cmd_parser.hpp"
#include <aesxx/all.hpp>
#include <boost/program_options.hpp>
#include <cstdlib>
#include <exception>
#include <fstream>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
namespace
{
std::ifstream::pos_type get_file_size(const std::string& path)
{
std::ifstream ifs;
ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
ifs.open(path, std::ifstream::binary | std::ifstream::ate);
return ifs.tellg();
}
std::vector<char> read_file(const std::string& path)
{
const auto size = static_cast<std::size_t>(get_file_size(path));
std::ifstream ifs;
ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
ifs.open(path, std::ifstream::binary);
std::vector<char> src_buf;
src_buf.reserve(size);
src_buf.assign(
std::istreambuf_iterator<char>(ifs),
std::istreambuf_iterator<char>());
return src_buf;
}
void write_file(
const std::string& path,
const std::vector<unsigned char>& src)
{
std::ofstream ofs;
ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
ofs.open(path, std::ofstream::binary);
ofs.write(reinterpret_cast<const char*>(src.data()), src.size());
}
void decrypt_file(
aes::Box& box,
const std::string& ciphertext_path,
const std::string& plaintext_path)
{
const auto ciphertext_buf = read_file(ciphertext_path);
const auto plaintext_buf = box.decrypt_buffer(
ciphertext_buf.data(), ciphertext_buf.size());
write_file(plaintext_path, plaintext_buf);
}
void decrypt_file(const Settings& settings)
{
const auto algorithm = settings.get_algorithm();
const auto mode = settings.get_mode();
const auto& ciphertext_path = settings.get_input_path();
const auto& plaintext_path = settings.get_output_path();
aes::Box::Key key;
aes::Box::parse_key(key, algorithm, settings.get_key_string());
if (aes::mode_requires_initialization_vector(mode))
{
aes::Box::Block iv;
aes::Box::parse_block(iv, algorithm, settings.get_iv_string());
aes::Box box{ algorithm, key, mode, iv };
decrypt_file(box, ciphertext_path, plaintext_path);
}
else
{
aes::Box box{ algorithm, key };
decrypt_file(box, ciphertext_path, plaintext_path);
}
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser(argv[0]);
try
{
Settings settings;
cmd_parser.parse(settings, argc, argv);
if (cmd_parser.exit_with_usage())
{
std::cout << cmd_parser;
return 0;
}
decrypt_file(settings);
}
catch (const boost::program_options::error& e)
{
std::cerr << "Usage error: " << e.what() << "\n";
std::cerr << cmd_parser;
return 1;
}
catch (const aes::Error& e)
{
std::cerr << e;
return 1;
}
}
catch (const std::exception& e)
{
std::cerr << e.what() << "\n";
return 1;
}
return 0;
}
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