63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
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* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
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* Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
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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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Acore::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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Acore::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 Acore::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 Acore::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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{
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return false;
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}
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int outLen;
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if (!EVP_CipherUpdate(_ctx, data, &outLen, data, len))
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{
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return false;
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}
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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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{
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return false;
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}
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if (!EVP_CipherFinal_ex(_ctx, data + outLen, &outLen))
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{
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return false;
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}
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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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{
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return false;
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}
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return true;
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}
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