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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 <aesni/all.h>
#include <aesnixx/all.hpp>
#include <cstdlib>
#include <exception>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
namespace
{
void exit_with_usage()
{
std::cout << "Usage: aes128ecb_decrypt_file.exe KEY SRC DEST\n";
std::exit(EXIT_FAILURE);
}
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();
}
}
int main(int argc, char** argv)
{
if (argc != 4)
exit_with_usage();
try
{
aesni::aes::Key128 key;
aesni::aes::from_string(key, argv[1]);
aesni::aes::RoundKeys128 encryption_keys, decryption_keys;
const std::string src_path(argv[2]);
const std::string dest_path(argv[3]);
const auto src_size = static_cast<std::size_t>(get_file_size(src_path));
std::ifstream src_ifs;
src_ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
src_ifs.open(src_path, std::ifstream::binary);
std::vector<char> src_buf;
src_buf.reserve(src_size);
src_buf.assign(std::istreambuf_iterator<char>(src_ifs),
std::istreambuf_iterator<char>());
aesni_aes128_expand_key(&key, &encryption_keys);
aesni_aes128_derive_decryption_keys(&encryption_keys, &decryption_keys);
std::size_t dest_size;
aesni_decrypt_buffer_ecb128(
src_buf.data(),
src_size,
NULL,
&dest_size,
&decryption_keys,
aesni::ErrorDetailsThrowsInDestructor());
std::vector<char> dest_buf;
dest_buf.reserve(dest_size);
aesni_decrypt_buffer_ecb128(
src_buf.data(),
src_size,
dest_buf.data(),
&dest_size,
&decryption_keys,
aesni::ErrorDetailsThrowsInDestructor());
std::ofstream dest_ofs;
dest_ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
dest_ofs.open(dest_path, std::ofstream::binary);
dest_ofs.write(dest_buf.data(), dest_size);
}
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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