mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-29 06:02:07 +03:00
9a026fc8d5
SipHash is highly HashDoS-resistent, initialized with a random seed at startup (i.e. non-deterministic) and usable for security-critical use cases with large enough parameters. We just use it because it's reasonably secure with parameters 1-3 while having excellent properties and not being significantly slower than before.
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/BitCast.h>
|
|
#include <AK/Concepts.h>
|
|
#include <AK/Forward.h>
|
|
#include <AK/HashFunctions.h>
|
|
#include <AK/SipHash.h>
|
|
#include <AK/StringHash.h>
|
|
|
|
namespace AK {
|
|
|
|
template<typename T>
|
|
struct GenericTraits {
|
|
using PeekType = T&;
|
|
using ConstPeekType = T const&;
|
|
static constexpr bool is_trivial() { return false; }
|
|
static constexpr bool is_trivially_serializable() { return false; }
|
|
static constexpr bool equals(T const& a, T const& b) { return a == b; }
|
|
template<Concepts::HashCompatible<T> U>
|
|
static bool equals(T const& self, U const& other) { return self == other; }
|
|
};
|
|
|
|
template<typename T>
|
|
struct Traits : public GenericTraits<T> {
|
|
};
|
|
|
|
template<Integral T>
|
|
struct Traits<T> : public GenericTraits<T> {
|
|
static constexpr bool is_trivial() { return true; }
|
|
static constexpr bool is_trivially_serializable() { return true; }
|
|
static unsigned hash(T value)
|
|
{
|
|
return standard_sip_hash(static_cast<u64>(value));
|
|
}
|
|
};
|
|
|
|
#ifndef KERNEL
|
|
template<FloatingPoint T>
|
|
struct Traits<T> : public GenericTraits<T> {
|
|
static constexpr bool is_trivial() { return true; }
|
|
static constexpr bool is_trivially_serializable() { return true; }
|
|
static unsigned hash(T value)
|
|
{
|
|
return standard_sip_hash(bit_cast<u64>(static_cast<double>(value)));
|
|
}
|
|
};
|
|
#endif
|
|
|
|
template<typename T>
|
|
requires(IsPointer<T> && !Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
|
|
static unsigned hash(T p) { return standard_sip_hash(bit_cast<FlatPtr>(p)); }
|
|
static constexpr bool is_trivial() { return true; }
|
|
};
|
|
|
|
template<Enum T>
|
|
struct Traits<T> : public GenericTraits<T> {
|
|
static unsigned hash(T value) { return Traits<UnderlyingType<T>>::hash(to_underlying(value)); }
|
|
static constexpr bool is_trivial() { return Traits<UnderlyingType<T>>::is_trivial(); }
|
|
static constexpr bool is_trivially_serializable() { return Traits<UnderlyingType<T>>::is_trivially_serializable(); }
|
|
};
|
|
|
|
template<typename T>
|
|
requires(Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
|
|
static unsigned hash(T const value) { return string_hash(value, strlen(value)); }
|
|
static constexpr bool equals(T const a, T const b) { return strcmp(a, b); }
|
|
static constexpr bool is_trivial() { return true; }
|
|
};
|
|
|
|
}
|
|
|
|
#if USING_AK_GLOBALLY
|
|
using AK::GenericTraits;
|
|
using AK::Traits;
|
|
#endif
|