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/**
* \file
* \author Egor Tensin <Egor.Tensin@gmail.com>
* \date 2015
* \copyright This file is licensed under the terms of the MIT License.
* See LICENSE.txt for details.
*/
#include "file_cmd_parser.hpp"
#include <aesni/all.h>
#include <aesnixx/all.hpp>
#include <boost/program_options.hpp>
#include <cstdlib>
#include <deque>
#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<char>& src)
{
std::ofstream ofs;
ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
ofs.open(path, std::ofstream::binary);
ofs.write(src.data(), src.size());
}
template <aesni::Algorithm algorithm>
bool decrypt_file_with_algorithm(
const AesNI_BoxAlgorithmParams& algorithm_params,
aesni::Mode mode,
std::deque<std::string>& args)
{
AesNI_BoxBlock iv;
AesNI_BoxBlock* iv_ptr = nullptr;
if (aesni::mode_requires_initialization_vector(mode))
{
if (args.empty())
return false;
aesni::from_string<algorithm>(iv.aes_block, args.front());
iv_ptr = &iv;
args.pop_front();
}
if (args.size() != 2)
return false;
const auto src_path = args[0];
const auto dest_path = args[1];
const auto src_buf = read_file(src_path);
AesNI_Box box;
aesni_box_init(
&box,
algorithm,
&algorithm_params,
mode,
iv_ptr,
aesni::ErrorDetailsThrowsInDestructor());
std::size_t dest_size;
aesni_box_decrypt_buffer(
&box,
src_buf.data(),
src_buf.size(),
nullptr,
&dest_size,
aesni::ErrorDetailsThrowsInDestructor());
std::vector<char> dest_buf;
dest_buf.resize(dest_size);
aesni_box_decrypt_buffer(
&box,
src_buf.data(),
src_buf.size(),
dest_buf.data(),
&dest_size,
aesni::ErrorDetailsThrowsInDestructor());
dest_buf.resize(dest_size);
write_file(dest_path, dest_buf);
return true;
}
bool decrypt_file(
aesni::Algorithm algorithm,
aesni::Mode mode,
std::deque<std::string>& args)
{
if (args.empty())
return false;
AesNI_BoxAlgorithmParams algorithm_params;
switch (algorithm)
{
case AESNI_AES128:
aesni::from_string<AESNI_AES128>(
algorithm_params.aes128_key, args.front());
args.pop_front();
return decrypt_file_with_algorithm<AESNI_AES128>(
algorithm_params, mode, args);
case AESNI_AES192:
aesni::from_string<AESNI_AES192>(
algorithm_params.aes192_key, args.front());
args.pop_front();
return decrypt_file_with_algorithm<AESNI_AES192>(
algorithm_params, mode, args);
case AESNI_AES256:
aesni::from_string<AESNI_AES256>(
algorithm_params.aes256_key, args.front());
args.pop_front();
return decrypt_file_with_algorithm<AESNI_AES256>(
algorithm_params, mode, args);
default:
return false;
}
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser("decrypt_file.exe");
cmd_parser.parse(argc, argv);
if (cmd_parser.requested_help())
{
std::cout << cmd_parser;
return 0;
}
std::deque<std::string> args{ std::make_move_iterator(cmd_parser.args.begin()),
std::make_move_iterator(cmd_parser.args.end()) };
if (!decrypt_file(cmd_parser.algorithm, cmd_parser.mode, args))
{
std::cout << cmd_parser;
return 1;
}
return 0;
}
catch (const boost::program_options::error& e)
{
std::cerr << "Usage error: " << e.what() << "\n";
return 1;
}
catch (const aesni::Error& e)
{
std::cerr << e;
return 1;
}
catch (const std::exception& e)
{
std::cerr << e.what() << "\n";
return 1;
}
}
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