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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 "helpers/bmp.hpp"
#include "helpers/file.hpp"
#include <aesxx/all.hpp>
#include <Windows.h>
#include <boost/program_options.hpp>
#include <exception>
#include <iostream>
#include <string>
namespace
{
void decrypt_bmp(
aes::Box& box,
const std::string& ciphertext_path,
const std::string& plaintext_path)
{
bmp::BmpFile bmp{file::read_file(ciphertext_path)};
bmp.replace_pixels(box.decrypt_buffer(
bmp.get_pixels(),
bmp.get_pixels_size()));
file::write_file(plaintext_path, bmp.get_buffer(), bmp.get_size());
}
void decrypt_bmp(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_bmp(box, ciphertext_path, plaintext_path);
}
else
{
aes::Box box{ algorithm, key };
decrypt_bmp(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_bmp(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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