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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 "block_input.hpp"
#include "data_parsers.hpp"
#include <aesxx/all.hpp>
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <deque>
#include <iterator>
#include <ostream>
#include <string>
#include <utility>
#include <vector>
namespace
{
class CommandLineParser;
class Settings
{
public:
aes::Algorithm algorithm = AES_AES128;
aes::Mode mode = AES_ECB;
bool use_boxes = false;
bool verbose = false;
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, std::vector<Input>& inputs)
{
Settings settings;
namespace po = boost::program_options;
options.add_options()
("help,h", "show this message and exit")
("use-boxes,b", po::bool_switch(&settings.use_boxes)->default_value(false), "use the \"boxes\" interface")
("mode,m", po::value<aes::Mode>(&settings.mode)->required(), "set mode of operation")
("algorithm,a", po::value<aes::Algorithm>(&settings.algorithm)->required(), "set algorithm")
("verbose,v", po::bool_switch(&settings.verbose)->default_value(false), "enable verbose output");
std::vector<std::string> args;
po::options_description hidden_options;
hidden_options.add_options()
("positional", po::value<std::vector<std::string>>(&args));
po::options_description all_options;
all_options.add(options).add(hidden_options);
po::positional_options_description positional_options;
positional_options.add("positional", -1);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv)
.options(all_options)
.positional(positional_options)
.run(), vm);
if (vm.count("help"))
{
help_flag = true;
return settings;
}
po::notify(vm);
inputs = parse_inputs(settings, std::deque<std::string>{
std::make_move_iterator(args.begin()),
std::make_move_iterator(args.end())});
return settings;
}
bool exit_with_usage() const { return help_flag; }
private:
static std::vector<Input> parse_inputs(
const Settings& settings,
std::deque<std::string>&& args)
{
std::vector<Input> inputs;
while (!args.empty())
inputs.emplace_back(parse_input(settings, args));
return inputs;
}
static Input parse_input(
const Settings& settings,
std::deque<std::string>& args)
{
std::string key{std::move(args.front())};
args.pop_front();
std::string iv;
if (aes::mode_requires_init_vector(settings.mode))
{
if (args.empty())
throw boost::program_options::error{"an initialization vector is required for the selected mode of operation"};
iv = std::move(args.front());
args.pop_front();
}
auto blocks = parse_blocks(args);
if (aes::mode_requires_init_vector(settings.mode))
return {key, iv, std::move(blocks)};
else
return {key, std::move(blocks)};
}
static std::vector<std::string> parse_blocks(std::deque<std::string>& args)
{
std::vector<std::string> blocks;
while (!args.empty())
{
std::string block{std::move(args.front())};
args.pop_front();
if (block == "--")
break;
blocks.emplace_back(std::move(block));
}
return blocks;
}
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 << " [OPTIONS...] [-- KEY [IV] [BLOCK...]...]\n"
<< cmd_parser.options << "\n";
}
}
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