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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/file.hpp"
#include <aesxx/all.hpp>
#include <boost/program_options.hpp>
#include <exception>
#include <iostream>
#include <string>
#include <vector>
namespace
{
void decrypt_file(
aes::Box& box,
const std::string& ciphertext_path,
const std::string& plaintext_path)
{
const auto ciphertext_buf = file::read_file(ciphertext_path);
const auto plaintext_buf = box.decrypt_buffer(
ciphertext_buf.data(),
ciphertext_buf.size());
file::write_file(plaintext_path, plaintext_buf);
}
void decrypt_file(const FileSettings& settings)
{
const auto& algorithm = settings.algorithm;
const auto& mode = settings.mode;
aes::Box::Key key;
aes::Box::parse_key(key, algorithm, settings.key);
if (aes::mode_requires_init_vector(mode))
{
aes::Box::Block iv;
aes::Box::parse_block(iv, algorithm, settings.iv);
aes::Box box{algorithm, key, mode, iv};
decrypt_file(box, settings.input_path, settings.output_path);
}
else
{
aes::Box box{algorithm, key};
decrypt_file(box, settings.input_path, settings.output_path);
}
}
}
int main(int argc, char** argv)
{
try
{
FileSettings settings{argv[0]};
try
{
settings.parse(argc, argv);
}
catch (const boost::program_options::error& e)
{
settings.usage_error(e);
return 1;
}
if (settings.exit_with_usage)
{
settings.usage();
return 0;
}
decrypt_file(settings);
}
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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