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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.
#pragma once
#include "algorithm.hpp"
#include "mode.hpp"
#include <cstddef>
#include <string>
#include <type_traits>
namespace aes
{
template <Algorithm algorithm>
struct Types;
template <Algorithm algorithm>
std::size_t get_number_of_rounds();
template <Algorithm algorithm>
void from_string(
typename Types<algorithm>::Block&,
const char*);
template <Algorithm algorithm>
void from_string(
typename Types<algorithm>::Block& dest,
const std::string& src)
{
from_string<algorithm>(dest, src.c_str());
}
template <Algorithm algorithm>
std::string to_string(const typename Types<algorithm>::Block&);
template <Algorithm algorithm>
std::string to_matrix_string(const typename Types<algorithm>::Block&);
template <Algorithm algorithm>
void from_string(
typename Types<algorithm>::Key&,
const char*);
template <Algorithm algorithm>
void from_string(
typename Types<algorithm>::Key& dest,
const std::string& src)
{
from_string<algorithm>(dest, src.c_str());
}
template <Algorithm algorithm>
std::string to_string(const typename Types<algorithm>::Key&);
template <Algorithm algorithm>
void expand_key(
const typename Types<algorithm>::Key& key,
typename Types<algorithm>::RoundKeys& encryption_keys);
template <Algorithm algorithm>
void derive_decryption_keys(
const typename Types<algorithm>::RoundKeys& encryption_keys,
typename Types<algorithm>::RoundKeys& decryption_keys);
template <Algorithm algorithm, Mode mode,
typename std::enable_if<ModeRequiresInitVector<mode>::value>::type* = nullptr>
void encrypt_block(
const typename Types<algorithm>::Block& plaintext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block& iv,
typename Types<algorithm>::Block& ciphertext);
template <Algorithm algorithm, Mode mode,
typename std::enable_if<!ModeRequiresInitVector<mode>::value>::type* = nullptr>
void encrypt_block(
const typename Types<algorithm>::Block& plaintext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block& ciphertext);
template <Algorithm algorithm, Mode mode,
typename std::enable_if<!ModeRequiresInitVector<mode>::value>::type* = nullptr>
void encrypt_block(
const typename Types<algorithm>::Block& plaintext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block&,
typename Types<algorithm>::Block& ciphertext)
{
encrypt_block<algorithm, mode>(plaintext, round_keys, ciphertext);
}
template <Algorithm algorithm, Mode mode,
typename std::enable_if<ModeRequiresInitVector<mode>::value>::type* = nullptr>
void decrypt_block(
const typename Types<algorithm>::Block& ciphertext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block& iv,
typename Types<algorithm>::Block& plaintext);
template <Algorithm algorithm, Mode mode,
typename std::enable_if<!ModeRequiresInitVector<mode>::value>::type* = nullptr>
void decrypt_block(
const typename Types<algorithm>::Block& ciphertext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block& plaintext);
template <Algorithm algorithm, Mode mode,
typename std::enable_if<!ModeRequiresInitVector<mode>::value>::type* = nullptr>
void decrypt_block(
const typename Types<algorithm>::Block& ciphertext,
const typename Types<algorithm>::RoundKeys& round_keys,
typename Types<algorithm>::Block&,
typename Types<algorithm>::Block& plaintext)
{
decrypt_block<algorithm, mode>(ciphertext, round_keys, plaintext);
}
template <Algorithm algorithm, Mode mode>
struct EncryptWrapper
{
EncryptWrapper(
const typename Types<algorithm>::Key& key,
const typename Types<algorithm>::Block& iv) : iv{iv}
{
expand_key<algorithm>(key, encryption_keys);
}
void encrypt_block(
const typename Types<algorithm>::Block& plaintext,
typename Types<algorithm>::Block& ciphertext)
{
aes::encrypt_block<algorithm, mode>(
plaintext, encryption_keys, iv, ciphertext);
}
typename Types<algorithm>::Block iv;
typename Types<algorithm>::RoundKeys encryption_keys;
};
template <Algorithm algorithm, Mode mode>
struct DecryptWrapper
{
DecryptWrapper(
const typename Types<algorithm>::Key& key,
const typename Types<algorithm>::Block& iv) : iv{iv}
{
typename Types<algorithm>::RoundKeys encryption_keys;
expand_key<algorithm>(key, encryption_keys);
if (ModeUsesEncryptionKeysOnly<mode>::value)
{
decryption_keys = encryption_keys;
}
else
{
derive_decryption_keys<algorithm>(encryption_keys, decryption_keys);
}
}
void decrypt_block(
const typename Types<algorithm>::Block& ciphertext,
typename Types<algorithm>::Block& plaintext)
{
aes::decrypt_block<algorithm, mode>(
ciphertext, decryption_keys, iv, plaintext);
}
typename Types<algorithm>::Block iv;
typename Types<algorithm>::RoundKeys decryption_keys;
};
}
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