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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 <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> ciphertext_buf;
ciphertext_buf.reserve(size);
ciphertext_buf.assign(
std::istreambuf_iterator<char>(ifs),
std::istreambuf_iterator<char>());
return ciphertext_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,
const std::string& ciphertext_path,
const std::string& plaintext_path)
{
const auto ciphertext_buf = read_file(ciphertext_path);
const auto bmp_header = reinterpret_cast<const BITMAPFILEHEADER*>(ciphertext_buf.data());
const auto header_size = bmp_header->bfOffBits;
const auto cipherpixels = ciphertext_buf.data() + header_size;
const auto cipherpixels_size = ciphertext_buf.size() - header_size;
const auto pixels = box.decrypt_buffer(
cipherpixels, cipherpixels_size);
std::vector<unsigned char> plaintext_buf(header_size + pixels.size());
std::memcpy(plaintext_buf.data(), bmp_header, header_size);
std::memcpy(plaintext_buf.data() + header_size, pixels.data(), pixels.size());
write_file(plaintext_path, plaintext_buf);
}
void decrypt_bmp(const Settings& settings)
{
const auto algorithm = settings.get_algorithm();
const auto mode = settings.get_mode();
const auto& ciphertext_path = settings.get_input_path();
const auto& plaintext_path = settings.get_output_path();
aesni::Box::Key key;
aesni::Box::parse_key(key, algorithm, settings.get_key_string());
if (aesni::mode_requires_initialization_vector(mode))
{
aesni::Box::Block iv;
aesni::Box::parse_block(iv, algorithm, settings.get_iv_string());
decrypt_bmp(
aesni::Box(algorithm, key, mode, iv),
ciphertext_path,
plaintext_path);
}
else
{
decrypt_bmp(
aesni::Box(algorithm, key),
ciphertext_path,
plaintext_path);
}
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser(argv[0]);
try
{
Settings settings;
cmd_parser.parse(settings, argc, argv);
if (cmd_parser.exit_with_usage())
{
std::cout << cmd_parser;
return 0;
}
decrypt_bmp(settings);
}
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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