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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 <aesnixx/all.hpp>
#include <boost/program_options.hpp>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <exception>
#include <fstream>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
#include <Windows.h>
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<unsigned char>& src)
{
std::ofstream ofs;
ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
ofs.open(path, std::ofstream::binary);
ofs.write(reinterpret_cast<const char*>(src.data()), src.size());
}
void decrypt_bmp(
aesni::Box& box,
std::deque<std::string>& args)
{
if (args.empty())
throw_src_path_required();
const auto src_path = args.front();
args.pop_front();
if (args.empty())
throw_dest_path_required();
const auto dest_path = args.front();
args.pop_front();
const auto src_buf = read_file(src_path);
const auto bmp_header = reinterpret_cast<const BITMAPFILEHEADER*>(src_buf.data());
const auto header_size = bmp_header->bfOffBits;
const auto cipherpixels = src_buf.data() + header_size;
const auto cipherpixels_size = src_buf.size() - header_size;
const auto pixels = box.decrypt_buffer(
cipherpixels, cipherpixels_size);
std::vector<unsigned char> dest_buf(header_size + pixels.size());
std::memcpy(&dest_buf[0], bmp_header, header_size);
std::memcpy(&dest_buf[0] + header_size, pixels.data(), pixels.size());
write_file(dest_path, dest_buf);
}
void decrypt_bmp(
aesni::Algorithm algorithm,
aesni::Mode mode,
std::deque<std::string>& args)
{
if (args.empty())
throw_key_required();
aesni::Box::Key key;
aesni::Box::parse_key(key, algorithm, args.front());
args.pop_front();
if (aesni::mode_requires_initialization_vector(mode))
{
if (args.empty())
throw_iv_required();
aesni::Box::Block iv;
aesni::Box::parse_block(iv, algorithm, args.front());
args.pop_front();
decrypt_bmp(
aesni::Box(algorithm, key, mode, iv), args);
}
else
{
decrypt_bmp(
aesni::Box(algorithm, key), args);
}
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser("decrypt_bmp.exe");
try
{
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()));
decrypt_bmp(cmd_parser.algorithm, cmd_parser.mode, args);
}
catch (const boost::program_options::error& e)
{
std::cerr << "Usage error: " << e.what() << "\n";
std::cerr << cmd_parser;
return 1;
}
catch (const aesni::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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