Legends-of-Azeroth-Pandaria-5.4.8

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/*
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* This file is part of the Pandaria 5.4.8 Project. See THANKS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "AES.h"
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#include "Errors.h"
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#include <limits>
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Trinity::Crypto::AES::AES(bool encrypting) : _ctx(EVP_CIPHER_CTX_new()), _encrypting(encrypting)
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{
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    EVP_CIPHER_CTX_init(_ctx);
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    int status = EVP_CipherInit_ex(_ctx, EVP_aes_128_gcm(), nullptr, nullptr, nullptr, _encrypting ? 1 : 0);
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    ASSERT(status);
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}
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Trinity::Crypto::AES::~AES()
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{
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    EVP_CIPHER_CTX_free(_ctx);
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}
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void Trinity::Crypto::AES::Init(Key const& key)
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{
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    int status = EVP_CipherInit_ex(_ctx, nullptr, nullptr, key.data(), nullptr, -1);
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    ASSERT(status);
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}
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bool Trinity::Crypto::AES::Process(IV const& iv, uint8* data, size_t length, Tag& tag)
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{
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    ASSERT(length <= static_cast<size_t>(std::numeric_limits<int>::max()));
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    int len = static_cast<int>(length);
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    if (!EVP_CipherInit_ex(_ctx, nullptr, nullptr, nullptr, iv.data(), -1))
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        return false;
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    int outLen;
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    if (!EVP_CipherUpdate(_ctx, data, &outLen, data, len))
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        return false;
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    len -= outLen;
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    if (!_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_SET_TAG, sizeof(tag), tag))
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        return false;
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    if (!EVP_CipherFinal_ex(_ctx, data + outLen, &outLen))
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        return false;
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    ASSERT(len == outLen);
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    if (_encrypting && !EVP_CIPHER_CTX_ctrl(_ctx, EVP_CTRL_GCM_GET_TAG, sizeof(tag), tag))
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        return false;
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    return true;
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}
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