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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.
#pragma once
#include "data_parsers.hpp"
#include <aesxx/all.hpp>
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <ostream>
#include <string>
#include <utility>
namespace
{
class CommandLineParser;
class Settings
{
public:
aes::Algorithm algorithm = AES_AES128;
aes::Mode mode = AES_ECB;
std::string input_path;
std::string output_path;
std::string key;
std::string iv;
private:
Settings() = default;
friend class CommandLineParser;
};
class CommandLineParser
{
public:
explicit CommandLineParser(const std::string& argv0)
: prog_name{boost::filesystem::path{argv0}.filename().string()}
, options{"Options"}
{ }
Settings parse(int argc, char** argv)
{
Settings settings;
namespace po = boost::program_options;
options.add_options()
("help,h", "show this message and exit")
("mode,m", po::value<aes::Mode>(&settings.mode)->required(), "set mode of operation")
("algorithm,a", po::value<aes::Algorithm>(&settings.algorithm)->required(), "set algorithm")
("input,i", po::value<std::string>(&settings.input_path)->required(), "set input file path")
("output,o", po::value<std::string>(&settings.output_path)->required(), "set output file path")
("key,k", po::value<std::string>(&settings.key)->required(), "set encryption key")
("iv,v", po::value<std::string>(&settings.iv), "set initialization vector");
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, options), vm);
if (vm.count("help"))
{
help_flag = true;
return settings;
}
po::notify(vm);
if (aes::mode_requires_init_vector(settings.mode))
{
if (!vm.count("iv"))
{
throw boost::program_options::error(
"an initialization vector is required for the selected mode of operation");
}
}
return settings;
}
bool exit_with_usage() const { return help_flag; }
private:
const std::string prog_name;
boost::program_options::options_description options;
bool help_flag = false;
friend std::ostream& operator<<(std::ostream&, const CommandLineParser&);
};
std::ostream& operator<<(std::ostream& os, const CommandLineParser& cmd_parser)
{
return os << "Usage: " << cmd_parser.prog_name << " [OPTION...]\n"
<< cmd_parser.options << "\n";
}
}
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