mirror of
https://github.com/azerothcore/azerothcore-wotlk.git
synced 2025-12-05 18:20:24 -08:00
52 lines
1.9 KiB
C++
52 lines
1.9 KiB
C++
/*
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* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your 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 "TOTP.h"
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#include "Timer.h"
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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constexpr std::size_t Acore::Crypto::TOTP::RECOMMENDED_SECRET_LENGTH;
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static constexpr uint32 TOTP_INTERVAL = 30;
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static constexpr uint32 HMAC_RESULT_SIZE = 20;
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/*static*/ uint32 Acore::Crypto::TOTP::GenerateToken(Secret const& secret, time_t timestamp)
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{
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timestamp /= TOTP_INTERVAL;
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unsigned char challenge[8];
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for (int i = 8; i--; timestamp >>= 8)
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challenge[i] = timestamp;
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unsigned char digest[HMAC_RESULT_SIZE];
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uint32 digestSize = HMAC_RESULT_SIZE;
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HMAC(EVP_sha1(), secret.data(), secret.size(), challenge, 8, digest, &digestSize);
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uint32 offset = digest[19] & 0xF;
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uint32 truncated = (digest[offset] << 24) | (digest[offset + 1] << 16) | (digest[offset + 2] << 8) | (digest[offset + 3]);
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truncated &= 0x7FFFFFFF;
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return (truncated % 1000000);
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}
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/*static*/ bool Acore::Crypto::TOTP::ValidateToken(Secret const& secret, uint32 token)
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{
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time_t now = GetEpochTime().count();
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return (
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(token == GenerateToken(secret, now - TOTP_INTERVAL)) ||
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(token == GenerateToken(secret, now)) ||
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(token == GenerateToken(secret, now + TOTP_INTERVAL))
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);
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}
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