mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
|
|
// over a single port, with support for SSL/TLS-based
|
|
// session authentication and key exchange,
|
|
// packet encryption, packet authentication, and
|
|
// packet compression.
|
|
//
|
|
// Copyright (C) 2012-2020 OpenVPN Inc.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License Version 3
|
|
// as published by the Free Software Foundation.
|
|
//
|
|
// 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 Affero General Public License
|
|
// along with this program in the COPYING file.
|
|
// If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#pragma once
|
|
|
|
#include <string>
|
|
#include <cstdint> // for std::uint32_t, uint64_t
|
|
|
|
#ifdef HAVE_XXHASH
|
|
#define USE_OPENVPN_HASH
|
|
#define XXH_INLINE_ALL
|
|
#include <xxhash.h>
|
|
#if XXH_VERSION_NUMBER < 800
|
|
#error requires XXHash version 0.8.0 or higher
|
|
#endif
|
|
#endif
|
|
|
|
#include <openvpn/common/exception.hpp>
|
|
#include <openvpn/common/size.hpp>
|
|
#include <openvpn/common/hexstr.hpp>
|
|
|
|
#define OPENVPN_HASH_METHOD(T, meth) \
|
|
namespace std { \
|
|
template <> \
|
|
struct hash<T> \
|
|
{ \
|
|
inline std::size_t operator()(const T& obj) const \
|
|
{ \
|
|
return obj.meth(); \
|
|
} \
|
|
}; \
|
|
}
|
|
|
|
#ifdef USE_OPENVPN_HASH
|
|
|
|
namespace openvpn {
|
|
|
|
class Hash64
|
|
{
|
|
public:
|
|
Hash64(const std::uint64_t init_hashval=0)
|
|
: hashval(init_hashval)
|
|
{
|
|
}
|
|
|
|
void operator()(const void *data, const std::size_t size)
|
|
{
|
|
hashval = XXH3_64bits_withSeed((const char *)data, size, hashval);
|
|
}
|
|
|
|
void operator()(const std::string& str)
|
|
{
|
|
(*this)(str.c_str(), str.length());
|
|
}
|
|
|
|
template <typename T>
|
|
inline void operator()(const T& obj)
|
|
{
|
|
static_assert(std::is_pod<T>::value, "Hash64: POD type required");
|
|
(*this)(&obj, sizeof(obj));
|
|
}
|
|
|
|
std::uint64_t value() const
|
|
{
|
|
return hashval;
|
|
}
|
|
|
|
std::string to_string() const
|
|
{
|
|
return render_hex_number(hashval);
|
|
}
|
|
|
|
private:
|
|
std::uint64_t hashval;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|