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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_CRYPTOHASH_H
#define TRINITY_CRYPTOHASH_H
#include "CryptoConstants.h"
#include "Define.h"
#include "Errors.h"
#include <array>
#include <string>
#include <string_view>
#include <utility>
#include <openssl/evp.h>
class BigNumber;
namespace Trinity::Impl
{
struct GenericHashImpl
{
typedef EVP_MD const* (*HashCreator)();
static EVP_MD_CTX* MakeCTX() noexcept { return EVP_MD_CTX_new(); }
static void DestroyCTX(EVP_MD_CTX* ctx) { EVP_MD_CTX_free(ctx); }
};
template <GenericHashImpl::HashCreator HashCreator, size_t DigestLength>
class GenericHash
{
public:
static constexpr size_t DIGEST_LENGTH = DigestLength;
using Digest = std::array<uint8, DIGEST_LENGTH>;
static Digest GetDigestOf(uint8 const* data, size_t len)
{
GenericHash hash;
hash.UpdateData(data, len);
hash.Finalize();
return hash.GetDigest();
}
template <typename... Ts, std::enable_if_t<std::conjunction_v<std::negation<std::is_integral<Ts>>...>, int32> = 0>
static Digest GetDigestOf(Ts&&... pack)
{
GenericHash hash;
(hash.UpdateData(std::forward<Ts>(pack)), ...);
hash.Finalize();
return hash.GetDigest();
}
GenericHash() : _ctx(GenericHashImpl::MakeCTX())
{
int result = EVP_DigestInit_ex(_ctx, HashCreator(), nullptr);
ASSERT(result == 1);
}
GenericHash(GenericHash const& right) : _ctx(GenericHashImpl::MakeCTX())
{
*this = right;
}
GenericHash(GenericHash&& right) noexcept
{
*this = std::move(right);
}
~GenericHash()
{
if (!_ctx)
return;
GenericHashImpl::DestroyCTX(_ctx);
_ctx = nullptr;
}
GenericHash& operator=(GenericHash const& right)
{
if (this == &right)
return *this;
int result = EVP_MD_CTX_copy_ex(_ctx, right._ctx);
ASSERT(result == 1);
_digest = right._digest;
return *this;
}
GenericHash& operator=(GenericHash&& right) noexcept
{
if (this == &right)
return *this;
_ctx = std::exchange(right._ctx, GenericHashImpl::MakeCTX());
_digest = std::exchange(right._digest, Digest{});
return *this;
}
void UpdateData(uint8 const* data, size_t len)
{
int result = EVP_DigestUpdate(_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;
int result = EVP_DigestFinal_ex(_ctx, _digest.data(), &length);
ASSERT(result == 1);
ASSERT(length == DIGEST_LENGTH);
}
Digest const& GetDigest() const { return _digest; }
private:
EVP_MD_CTX* _ctx;
Digest _digest = { };
};
}
namespace Trinity::Crypto
{
using MD5 = Trinity::Impl::GenericHash<EVP_md5, Constants::MD5_DIGEST_LENGTH_BYTES>;
using SHA1 = Trinity::Impl::GenericHash<EVP_sha1, Constants::SHA1_DIGEST_LENGTH_BYTES>;
using SHA256 = Trinity::Impl::GenericHash<EVP_sha256, Constants::SHA256_DIGEST_LENGTH_BYTES>;
using SHA512 = Trinity::Impl::GenericHash<EVP_sha512, Constants::SHA512_DIGEST_LENGTH_BYTES>;
}
#endif
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