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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"
Trinity::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
{
EVP_CIPHER_CTX_init(_ctx);
EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
}
Trinity::Crypto::AES::~AES()
{
EVP_CIPHER_CTX_free(_ctx);
}
void Trinity::Crypto::AES::Init(uint8 const* key)
{
EVP_CipherInit_ex(_ctx, nullptr, nullptr, key, nullptr, -1);
}
bool Trinity::Crypto::AES::Process(uint8 const* iv, uint8* data, std::size_t length, uint8(&tag)[12])
{
if (!EVP_CipherInit_ex(_ctx, nullptr, nullptr, nullptr, iv, -1))
return false;
int outLen;
if (!EVP_CipherUpdate(_ctx, data, &outLen, data, length))
return false;
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;
if (_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_GET_TAG, sizeof(tag), tag))
return false;
return true;
}
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