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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_HMAC_H
#define AZEROTHCORE_HMAC_H
#include "CryptoConstants.h"
#include "Define.h"
#include "Errors.h"
#include <array>
#include <openssl/hmac.h>
#include <string>
#include <string_view>
class BigNumber;
namespace Acore::Impl
{
struct HMACImpl
{
typedef EVP_MD const* (*HashCreator)();
#if defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x10100000L
static HMAC_CTX* MakeCTX()
{
HMAC_CTX* ctx = new HMAC_CTX();
HMAC_CTX_init(ctx);
return ctx;
}
static void DestroyCTX(HMAC_CTX* ctx)
{
HMAC_CTX_cleanup(ctx);
delete ctx;
}
#else
static HMAC_CTX* MakeCTX() { return HMAC_CTX_new(); }
static void DestroyCTX(HMAC_CTX* ctx) { HMAC_CTX_free(ctx); }
#endif
};
template <HMACImpl::HashCreator HashCreator, size_t DigestLength>
class GenericHMAC
{
public:
static constexpr size_t DIGEST_LENGTH = DigestLength;
using Digest = std::array<uint8, DIGEST_LENGTH>;
template <typename Container>
static Digest GetDigestOf(Container const& seed, uint8 const* data, size_t len)
{
GenericHMAC hash(seed);
hash.UpdateData(data, len);
hash.Finalize();
return hash.GetDigest();
}
template <typename Container, typename... Ts>
static auto GetDigestOf(Container const& seed, Ts&& ... pack) -> std::enable_if_t < !(std::is_integral_v<std::decay_t<Ts>> || ...), Digest >
{
GenericHMAC hash(seed);
(hash.UpdateData(std::forward<Ts>(pack)), ...);
hash.Finalize();
return hash.GetDigest();
}
GenericHMAC(uint8 const* seed, size_t len) : _ctx(HMACImpl::MakeCTX())
{
int result = HMAC_Init_ex(_ctx, seed, len, HashCreator(), nullptr);
ASSERT(result == 1);
}
template <typename Container> GenericHMAC(Container const& container) : GenericHMAC(std::data(container), std::size(container)) {}
~GenericHMAC()
{
if (!_ctx)
{
return;
}
HMACImpl::DestroyCTX(_ctx);
_ctx = nullptr;
}
void UpdateData(uint8 const* data, size_t len)
{
int result = HMAC_Update(_ctx, data, len);
ASSERT(result == 1);
}
void UpdateData(std::string_view str) { UpdateData(reinterpret_cast<uint8 const*>(str.data()), str.size()); }
void UpdateData(std::string const& str) { UpdateData(std::string_view(str)); } /* explicit overload to avoid using the container template */
void UpdateData(char const* str) { UpdateData(std::string_view(str)); } /* explicit overload to avoid using the container template */
template <typename Container>
void UpdateData(Container const& c) { UpdateData(std::data(c), std::size(c)); }
void Finalize()
{
uint32 length = 0;
int result = HMAC_Final(_ctx, _digest.data(), &length);
ASSERT(result == 1);
ASSERT(length == DIGEST_LENGTH);
HMACImpl::DestroyCTX(_ctx);
_ctx = nullptr;
}
Digest const& GetDigest() const { return _digest; }
private:
HMAC_CTX* _ctx;
Digest _digest = { };
};
}
namespace Acore::Crypto
{
using HMAC_SHA1 = Acore::Impl::GenericHMAC<EVP_sha1, Constants::SHA1_DIGEST_LENGTH_BYTES>;
using HMAC_SHA256 = Acore::Impl::GenericHMAC<EVP_sha256, Constants::SHA256_DIGEST_LENGTH_BYTES>;
}
#endif
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