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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation; either version 3 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 Affero 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/>.
*/
#ifndef AZEROTHCORE_SRP6_H
#define AZEROTHCORE_SRP6_H
#include "AuthDefines.h"
#include "BigNumber.h"
#include "Common.h"
#include "CryptoHash.h"
#include "Define.h"
#include <array>
#include <optional>
namespace Acore::Crypto
{
class SRP6
{
public:
static constexpr size_t SALT_LENGTH = 32;
using Salt = std::array<uint8, SALT_LENGTH>;
static constexpr size_t VERIFIER_LENGTH = 32;
using Verifier = std::array<uint8, VERIFIER_LENGTH>;
static constexpr size_t EPHEMERAL_KEY_LENGTH = 32;
using EphemeralKey = std::array<uint8, EPHEMERAL_KEY_LENGTH>;
static std::array<uint8, 1> const g;
static std::array<uint8, 32> const N;
// username + password must be passed through Utf8ToUpperOnlyLatin FIRST!
static std::pair<Salt, Verifier> MakeRegistrationData(std::string const& username, std::string const& password);
// username + password must be passed through Utf8ToUpperOnlyLatin FIRST!
static bool CheckLogin(std::string const& username, std::string const& password, Salt const& salt, Verifier const& verifier)
{
return (verifier == CalculateVerifier(username, password, salt));
}
static SHA1::Digest GetSessionVerifier(EphemeralKey const& A, SHA1::Digest const& clientM, SessionKey const& K)
{
return SHA1::GetDigestOf(A, clientM, K);
}
SRP6(std::string const& username, Salt const& salt, Verifier const& verifier);
std::optional<SessionKey> VerifyChallengeResponse(EphemeralKey const& A, SHA1::Digest const& clientM);
private:
bool _used = false; // a single instance can only be used to verify once
static Verifier CalculateVerifier(std::string const& username, std::string const& password, Salt const& salt);
static SessionKey SHA1Interleave(EphemeralKey const& S);
/* global algorithm parameters */
static BigNumber const _g; // a [g]enerator for the ring of integers mod N, algorithm parameter
static BigNumber const _N; // the modulus, an algorithm parameter; all operations are mod this
static EphemeralKey _B(BigNumber const& b, BigNumber const& v) { return ((_g.ModExp(b, _N) + (v * 3)) % N).ToByteArray<EPHEMERAL_KEY_LENGTH>(); }
/* per-instantiation parameters, set on construction */
SHA1::Digest const _I; // H(I) - the username, all uppercase
BigNumber const _b; // b - randomly chosen by the server, 19 bytes, never given out
BigNumber const _v; // v - the user's password verifier, derived from s + H(USERNAME || ":" || PASSWORD)
public:
Salt const s; // s - the user's password salt, random, used to calculate v on registration
EphemeralKey const B; // B = 3v + g^b
};
}
#endif
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