mirror of
https://github.com/SerenityOS/serenity
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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++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/BitCast.h>
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#include <AK/Concepts.h>
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#include <AK/Forward.h>
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#include <AK/HashFunctions.h>
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#include <AK/SipHash.h>
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#include <AK/StringHash.h>
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namespace AK {
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template<typename T>
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struct GenericTraits {
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using PeekType = T&;
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using ConstPeekType = T const&;
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static constexpr bool is_trivial() { return false; }
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static constexpr bool is_trivially_serializable() { return false; }
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static constexpr bool equals(T const& a, T const& b) { return a == b; }
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template<Concepts::HashCompatible<T> U>
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static bool equals(T const& self, U const& other) { return self == other; }
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};
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template<typename T>
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struct Traits : public GenericTraits<T> {
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};
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template<Integral T>
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struct Traits<T> : public GenericTraits<T> {
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static constexpr bool is_trivial() { return true; }
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static constexpr bool is_trivially_serializable() { return true; }
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static unsigned hash(T value)
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{
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return standard_sip_hash(static_cast<u64>(value));
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}
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};
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#ifndef KERNEL
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template<FloatingPoint T>
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struct Traits<T> : public GenericTraits<T> {
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static constexpr bool is_trivial() { return true; }
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static constexpr bool is_trivially_serializable() { return true; }
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static unsigned hash(T value)
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{
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return standard_sip_hash(bit_cast<u64>(static_cast<double>(value)));
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}
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};
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#endif
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template<typename T>
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requires(IsPointer<T> && !Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T p) { return standard_sip_hash(bit_cast<FlatPtr>(p)); }
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static constexpr bool is_trivial() { return true; }
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};
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template<Enum T>
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struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T value) { return Traits<UnderlyingType<T>>::hash(to_underlying(value)); }
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static constexpr bool is_trivial() { return Traits<UnderlyingType<T>>::is_trivial(); }
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static constexpr bool is_trivially_serializable() { return Traits<UnderlyingType<T>>::is_trivially_serializable(); }
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};
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template<typename T>
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requires(Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T const value) { return string_hash(value, strlen(value)); }
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static constexpr bool equals(T const a, T const b) { return strcmp(a, b); }
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static constexpr bool is_trivial() { return true; }
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};
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}
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#if USING_AK_GLOBALLY
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using AK::GenericTraits;
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using AK::Traits;
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#endif
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