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/*
* This file is part of the TrinityCore 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 General Public License as published by the
* Free Software Foundation; either version 2 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 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 TRINITY_HMAC_H
#define TRINITY_HMAC_H
#include "CryptoConstants.h"
#include "CryptoHash.h"
#include "Define.h"
#include "Errors.h"
#include <array>
#include <string>
#include <string_view>
class BigNumber;
namespace Trinity::Impl
{
template <GenericHashImpl::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::conjunction_v<std::negation<std::is_integral<Ts>>...>, Digest>
{
GenericHMAC hash(seed);
(hash.UpdateData(std::forward<Ts>(pack)), ...);
hash.Finalize();
return hash.GetDigest();
}
GenericHMAC(uint8 const* seed, size_t len) : _ctx(GenericHashImpl::MakeCTX()), _key(EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, nullptr, seed, len))
{
int result = EVP_DigestSignInit(_ctx, nullptr, HashCreator(), nullptr, _key);
ASSERT(result == 1);
}
template <typename Container>
GenericHMAC(Container const& container) : GenericHMAC(std::data(container), std::size(container)) {}
GenericHMAC(GenericHMAC const& right) : _ctx(GenericHashImpl::MakeCTX())
{
*this = right;
}
GenericHMAC(GenericHMAC&& right) noexcept
{
*this = std::move(right);
}
~GenericHMAC()
{
GenericHashImpl::DestroyCTX(_ctx);
_ctx = nullptr;
EVP_PKEY_free(_key);
_key = nullptr;
}
GenericHMAC& operator=(GenericHMAC const& right)
{
if (this == &right)
return *this;
int result = EVP_MD_CTX_copy_ex(_ctx, right._ctx);
ASSERT(result == 1);
_key = right._key; // EVP_PKEY uses reference counting internally, just copy the pointer
EVP_PKEY_up_ref(_key); // Bump reference count for PKEY, as every instance of this class holds two references to PKEY and destructor decrements it twice
_digest = right._digest;
return *this;
}
GenericHMAC& operator=(GenericHMAC&& right) noexcept
{
if (this == &right)
return *this;
_ctx = std::exchange(right._ctx, GenericHashImpl::MakeCTX());
_key = std::exchange(right._key, EVP_PKEY_new());
_digest = std::exchange(right._digest, Digest{});
return *this;
}
void UpdateData(uint8 const* data, size_t len)
{
int result = EVP_DigestSignUpdate(_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()
{
size_t length = DIGEST_LENGTH;
int result = EVP_DigestSignFinal(_ctx, _digest.data(), &length);
ASSERT(result == 1);
ASSERT(length == DIGEST_LENGTH);
}
Digest const& GetDigest() const { return _digest; }
private:
EVP_MD_CTX* _ctx;
EVP_PKEY* _key;
Digest _digest = { };
};
}
namespace Trinity::Crypto
{
using HMAC_SHA1 = Trinity::Impl::GenericHMAC<EVP_sha1, Constants::SHA1_DIGEST_LENGTH_BYTES>;
using HMAC_SHA256 = Trinity::Impl::GenericHMAC<EVP_sha256, Constants::SHA256_DIGEST_LENGTH_BYTES>;
using HMAC_SHA512 = Trinity::Impl::GenericHMAC<EVP_sha512, Constants::SHA512_DIGEST_LENGTH_BYTES>;
}
#endif
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