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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRINITY_CRYPTO_GENERICS_HPP
#define TRINITY_CRYPTO_GENERICS_HPP
#include "advstd.h"
#include "BigNumber.h"
#include "Define.h"
#include "Errors.h"
#include <vector>
#include <openssl/rand.h>
namespace Trinity
{
namespace Impl
{
struct CryptoGenericsImpl
{
template <typename Cipher>
static typename Cipher::IV GenerateRandomIV()
{
typename Cipher::IV iv;
int status = RAND_bytes(std::data(iv), std::size(iv));
ASSERT(status);
return iv;
}
template <typename C>
static void AppendToBack(std::vector<uint8>& data, C const& tail)
{
data.insert(data.end(), std::begin(tail), std::end(tail));
}
template <typename C>
static void SplitFromBack(std::vector<uint8>& data, C& tail)
{
ASSERT(data.size() >= std::size(tail));
for (size_t i = 1, N = std::size(tail); i <= N; ++i)
{
tail[N - i] = data.back();
data.pop_back();
}
}
};
}
namespace Crypto
{
template <typename Cipher>
void AEEncryptWithRandomIV(std::vector<uint8>& data, typename Cipher::Key const& key)
{
using IV = typename Cipher::IV;
using Tag = typename Cipher::Tag;
// select random IV
IV iv = Trinity::Impl::CryptoGenericsImpl::GenerateRandomIV<Cipher>();
Tag tag;
// encrypt data
Cipher cipher(true);
cipher.Init(key);
bool success = cipher.Process(iv, data.data(), data.size(), tag);
ASSERT(success);
// append trailing IV and tag
Trinity::Impl::CryptoGenericsImpl::AppendToBack(data, iv);
Trinity::Impl::CryptoGenericsImpl::AppendToBack(data, tag);
}
template <typename Cipher>
void AEEncryptWithRandomIV(std::vector<uint8>& data, BigNumber const& key)
{
AEEncryptWithRandomIV<Cipher>(data, key.AsByteArray<Cipher::KEY_SIZE_BYTES>());
}
template <typename Cipher>
bool AEDecrypt(std::vector<uint8>& data, typename Cipher::Key const& key)
{
using IV = typename Cipher::IV;
using Tag = typename Cipher::Tag;
// extract trailing IV and tag
IV iv;
Tag tag;
Trinity::Impl::CryptoGenericsImpl::SplitFromBack(data, tag);
Trinity::Impl::CryptoGenericsImpl::SplitFromBack(data, iv);
// decrypt data
Cipher cipher(false);
cipher.Init(key);
return cipher.Process(iv, data.data(), data.size(), tag);
}
template <typename Cipher>
bool AEDecrypt(std::vector<uint8>& data, BigNumber const& key)
{
return AEDecrypt<Cipher>(data, key.AsByteArray<Cipher::KEY_SIZE_BYTES>());
}
}
}
#endif
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