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// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "AES tools" project.
// For details, see https://github.com/egor-tensin/aes-tools.
// Distributed under the MIT License.
#include "block_cmd_parser.hpp"
#include "block_dumper.hpp"
#include "block_input.hpp"
#include <aesxx/all.hpp>
#include <boost/program_options.hpp>
#include <exception>
#include <iostream>
#include <stdexcept>
#include <string>
namespace
{
template <aes::Algorithm algorithm, aes::Mode mode>
void decrypt_with_mode(
const Input& input,
bool verbose = false)
{
typename aes::Types<algorithm>::Block iv;
if (aes::ModeRequiresInitVector<mode>())
{
aes::from_string<algorithm>(iv, input.iv);
if (verbose)
dump_iv<algorithm>(iv);
}
typename aes::Types<algorithm>::Key key;
aes::from_string<algorithm>(key, input.key);
if (verbose)
dump_key<algorithm>(key);
aes::DecryptWrapper<algorithm, mode> decrypt{key, iv};
if (verbose)
dump_wrapper<algorithm, mode>(decrypt);
for (const auto& block : input.blocks)
{
typename aes::Types<algorithm>::Block ciphertext, plaintext;
aes::from_string<algorithm>(ciphertext, block);
decrypt.decrypt_block(ciphertext, plaintext);
if (verbose)
{
dump_ciphertext<algorithm>(ciphertext);
dump_plaintext<algorithm>(plaintext);
dump_next_iv<algorithm, mode>(decrypt);
}
else
{
std::cout << aes::to_string<algorithm>(plaintext) << '\n';
}
}
}
template <aes::Algorithm algorithm>
void decrypt_with_algorithm(
aes::Mode mode,
const Input& input,
bool verbose = false)
{
switch (mode)
{
case AES_ECB:
decrypt_with_mode<algorithm, AES_ECB>(input, verbose);
break;
case AES_CBC:
decrypt_with_mode<algorithm, AES_CBC>(input, verbose);
break;
case AES_CFB:
decrypt_with_mode<algorithm, AES_CFB>(input, verbose);
break;
case AES_OFB:
decrypt_with_mode<algorithm, AES_OFB>(input, verbose);
break;
case AES_CTR:
decrypt_with_mode<algorithm, AES_CTR>(input, verbose);
break;
default:
throw std::runtime_error("the selected mode of operation is not implemented");
break;
}
}
void decrypt_using_cxx_api(
aes::Algorithm algorithm,
aes::Mode mode,
const Input& input,
bool verbose = false)
{
switch (algorithm)
{
case AES_AES128:
decrypt_with_algorithm<AES_AES128>(mode, input, verbose);
break;
case AES_AES192:
decrypt_with_algorithm<AES_AES192>(mode, input, verbose);
break;
case AES_AES256:
decrypt_with_algorithm<AES_AES256>(mode, input, verbose);
break;
default:
throw std::runtime_error("the selected algorithm is not implemented");
break;
}
}
void decrypt_using_particular_box(
aes::Box& box,
const std::vector<std::string>& blocks)
{
for (const auto& block : blocks)
{
aes::Box::Block ciphertext;
box.parse_block(ciphertext, block);
aes::Box::Block plaintext;
box.decrypt_block(ciphertext, plaintext);
std::cout << box.format_block(plaintext) << '\n';
}
}
void decrypt_using_boxes(
aes::Algorithm algorithm,
aes::Mode mode,
const Input& input)
{
aes::Box::Key key;
aes::Box::parse_key(key, algorithm, input.key);
if (aes::mode_requires_init_vector(mode))
{
aes::Box::Block iv;
aes::Box::parse_block(iv, algorithm, input.iv);
aes::Box box{algorithm, key, mode, iv};
decrypt_using_particular_box(box, input.blocks);
}
else
{
aes::Box box{algorithm, key};
decrypt_using_particular_box(box, input.blocks);
}
}
}
int main(int argc, char** argv)
{
try
{
BlockSettings settings{argv[0]};
try
{
settings.parse(argc, argv);
}
catch (const boost::program_options::error& e)
{
settings.usage_error(e);
return 1;
}
if (settings.exit_with_usage)
{
settings.usage();
return 0;
}
for (const auto& input : settings.inputs)
{
if (settings.use_boxes)
{
decrypt_using_boxes(
settings.algorithm,
settings.mode,
input);
}
else
{
decrypt_using_cxx_api(
settings.algorithm,
settings.mode,
input,
settings.verbose);
}
}
}
catch (const aes::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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