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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_block_common.hpp"
#include <aesni/all.h>
#include <aesnixx/all.hpp>
#include <deque>
#include <exception>
#include <iostream>
#include <string>
namespace
{
template <aesni::Algorithm algorithm, aesni::Mode mode>
bool decrypt_with_mode(
const std::string& key_str,
std::deque<std::string>& ciphertexts)
{
typename aesni::aes::Types<algorithm>::BlockT iv;
if (aesni::ModeRequiresInitializationVector<mode>())
{
if (ciphertexts.empty())
return false;
aesni::aes::from_string(iv, ciphertexts.front());
ciphertexts.pop_front();
}
typename aesni::aes::Types<algorithm>::KeyT key;
aesni::aes::from_string(key, key_str);
aesni::aes::Encrypt<algorithm, mode> encrypt(key, iv);
while (!ciphertexts.empty())
{
typename aesni::aes::Types<algorithm>::BlockT ciphertext;
aesni::aes::from_string(ciphertext, ciphertexts.front());
ciphertexts.pop_front();
std::cout << aesni::aes::to_string(encrypt.decrypt(ciphertext)) << "\n";
}
return true;
}
template <aesni::Algorithm algorithm>
bool decrypt_with_algorithm(
aesni::Mode mode,
const std::string& key_str,
std::deque<std::string>& ciphertexts)
{
switch (mode)
{
case AESNI_ECB:
return decrypt_with_mode<algorithm, AESNI_ECB>(key_str, ciphertexts);
case AESNI_CBC:
return decrypt_with_mode<algorithm, AESNI_CBC>(key_str, ciphertexts);
case AESNI_CFB:
return decrypt_with_mode<algorithm, AESNI_CFB>(key_str, ciphertexts);
case AESNI_OFB:
return decrypt_with_mode<algorithm, AESNI_OFB>(key_str, ciphertexts);
case AESNI_CTR:
return decrypt_with_mode<algorithm, AESNI_CTR>(key_str, ciphertexts);
default:
return false;
}
}
bool decrypt(
aesni::Algorithm algorithm,
aesni::Mode mode,
const std::string& key_str,
std::deque<std::string> ciphertexts)
{
switch (algorithm)
{
case AESNI_AES128:
return decrypt_with_algorithm<AESNI_AES128>(mode, key_str, ciphertexts);
case AESNI_AES192:
return decrypt_with_algorithm<AESNI_AES192>(mode, key_str, ciphertexts);
case AESNI_AES256:
return decrypt_with_algorithm<AESNI_AES256>(mode, key_str, ciphertexts);
default:
return false;
}
}
bool decrypt_using_boxes(
aesni::Algorithm algorithm,
aesni::Mode mode,
const std::string& key,
std::deque<std::string> ciphertexts)
{
AesNI_BoxAlgorithmParams algorithm_params;
switch (algorithm)
{
case AESNI_AES128:
aesni::aes::from_string(algorithm_params.aes128_key, key);
break;
case AESNI_AES192:
aesni::aes::from_string(algorithm_params.aes192_key, key);
break;
case AESNI_AES256:
aesni::aes::from_string(algorithm_params.aes256_key, key);
break;
default:
return false;
}
AesNI_BoxBlock iv;
AesNI_BoxBlock* iv_ptr = nullptr;
if (aesni::mode_requires_initialization_vector(mode))
{
if (ciphertexts.empty())
return false;
aesni::aes::from_string(iv.aes_block, ciphertexts.front());
iv_ptr = &iv;
ciphertexts.pop_front();
}
AesNI_Box box;
aesni_box_init(
&box,
algorithm,
&algorithm_params,
mode,
iv_ptr,
aesni::ErrorDetailsThrowsInDestructor());
while (!ciphertexts.empty())
{
AesNI_BoxBlock ciphertext;
aesni::aes::from_string(ciphertext.aes_block, ciphertexts.front());
ciphertexts.pop_front();
AesNI_BoxBlock plaintext;
aesni_box_decrypt_block(
&box,
&ciphertext,
&plaintext,
aesni::ErrorDetailsThrowsInDestructor());
std::cout << aesni::aes::to_string(plaintext.aes_block) << "\n";
}
return true;
}
}
int main(int argc, char** argv)
{
try
{
CommandLineParser cmd_parser("aes_decrypt_block.exe");
if (!cmd_parser.parse_options(argc, argv))
return 0;
const auto algorithm = cmd_parser.get_algorithm();
const auto mode = cmd_parser.get_mode();
auto args = cmd_parser.get_args();
while (!args.empty())
{
const auto key = args.front();
args.pop_front();
std::deque<std::string> ciphertexts;
while (!args.empty())
{
if (args.front() == "--")
{
args.pop_front();
break;
}
ciphertexts.push_back(args.front());
args.pop_front();
}
const auto success = cmd_parser.use_boxes()
? decrypt_using_boxes(algorithm, mode, key, ciphertexts)
: decrypt(algorithm, mode, key, ciphertexts);
if (!success)
{
cmd_parser.print_usage();
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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