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/*
* Copyright (C) 2008-2019 TrinityCore <https://www.trinitycore.org/>
*
* 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/>.
*/
#include "AES.h"
#include "Errors.h"
#include <limits>
Trinity::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
{
EVP_CIPHER_CTX_init(_ctx);
int status = EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
ASSERT(status);
}
Trinity::Crypto::AES::~AES()
{
EVP_CIPHER_CTX_free(_ctx);
}
void Trinity::Crypto::AES::Init(Key const& key)
{
int status = EVP_CipherInit_ex(_ctx, nullptr, nullptr, key.data(), nullptr, -1);
ASSERT(status);
}
bool Trinity::Crypto::AES::Process(IV const& iv, uint8* data, std::size_t length, Tag& tag)
{
ASSERT(length <= std::numeric_limits<int>::max());
int len = static_cast<int>(length);
if (!EVP_CipherInit_ex(_ctx, nullptr, nullptr, nullptr, iv.data(), -1))
return false;
int outLen;
if (!EVP_CipherUpdate(_ctx, data, &outLen, data, len))
return false;
len -= outLen;
if (!_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_SET_TAG, sizeof(tag), tag))
return false;
if (!EVP_CipherFinal_ex(_ctx, data + outLen, &outLen))
return false;
ASSERT(len == outLen);
if (_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_GET_TAG, sizeof(tag), tag))
return false;
return true;
}
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