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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 "aes_common.hpp"
#include <aesni/all.h>
#include <aesnixx/all.hpp>
#include <boost/program_options.hpp>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <fstream>
#include <iostream>
#include <string>
#include <utility>
#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<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());
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser("aes_decrypt_bmp.exe");
if (!cmd_parser.parse_options(argc, argv))
return 0;
auto args = cmd_parser.get_args();
if (args.empty())
{
cmd_parser.print_usage();
return 1;
}
AesNI_BoxAlgorithmParams algorithm_params;
switch (cmd_parser.get_algorithm())
{
case AESNI_AES128:
aesni::aes::from_string(algorithm_params.aes128_key, args.front());
break;
case AESNI_AES192:
aesni::aes::from_string(algorithm_params.aes192_key, args.front());
break;
case AESNI_AES256:
aesni::aes::from_string(algorithm_params.aes256_key, args.front());
break;
}
args.pop_front();
AesNI_BoxBlock iv;
AesNI_BoxBlock* iv_ptr = nullptr;
switch (cmd_parser.get_mode())
{
case AESNI_ECB:
break;
case AESNI_CBC:
case AESNI_CFB:
case AESNI_OFB:
case AESNI_CTR:
if (args.empty())
{
cmd_parser.print_usage();
return 1;
}
aesni::aes::from_string(iv.aes_block, args.front());
iv_ptr = &iv;
args.pop_front();
break;
}
if (args.size() != 2)
{
cmd_parser.print_usage();
return 1;
}
const auto src_path = args[0];
const auto dest_path = args[1];
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;
AesNI_Box box;
aesni_box_init(
&box,
cmd_parser.get_algorithm(),
&algorithm_params,
cmd_parser.get_mode(),
iv_ptr,
aesni::ErrorDetailsThrowsInDestructor());
std::size_t pixels_size;
aesni_box_decrypt_buffer(
&box,
cipherpixels,
cipherpixels_size,
nullptr,
&pixels_size,
aesni::ErrorDetailsThrowsInDestructor());
std::vector<char> dest_buf;
dest_buf.resize(header_size + pixels_size);
std::memcpy(dest_buf.data(), src_buf.data(), header_size);
aesni_box_decrypt_buffer(
&box,
cipherpixels,
cipherpixels_size,
dest_buf.data() + header_size,
&pixels_size,
aesni::ErrorDetailsThrowsInDestructor());
dest_buf.resize(header_size + pixels_size);
write_file(dest_path, dest_buf);
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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