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// 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- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#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 < 700
#error requires XXHash version 0.7.0 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::uint64_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;
};
} // namespace openvpn
#endif
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