mirror of
https://github.com/Facepunch/sbox-public.git
synced 2026-01-18 03:09:45 -05:00
71f266059a
This commit imports the C# engine code and game files, excluding C++ source code. [Source-Commit: ceb3d758046e50faa6258bc3b658a30c97743268]
834 lines
37 KiB
C#
834 lines
37 KiB
C#
// IMPORTANT: TEMPORARY WILL GET REMOVED, and replaced by System.IO.Hashing after .NET10 drops
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System;
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using System.Buffers.Binary;
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using System.Diagnostics;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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#if NET
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using System.Runtime.Intrinsics;
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using System.Runtime.Intrinsics.Arm;
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using System.Runtime.Intrinsics.X86;
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#endif
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namespace Sandbox.Hashing;
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/// <summary>Shared implementation of the XXH3 hash algorithm for 64-bit in <see cref="XxHash3"/> and <see cref="XxHash128"/> version.</summary>
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#if NET
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[SkipLocalsInit]
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#endif
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internal static unsafe class XxHashShared
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{
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public const int StripeLengthBytes = 64;
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public const int SecretLengthBytes = 192;
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public const int SecretSizeMin = 136;
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public const int SecretLastAccStartBytes = 7;
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public const int SecretConsumeRateBytes = 8;
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public const int SecretMergeAccsStartBytes = 11;
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public const int NumStripesPerBlock = (SecretLengthBytes - StripeLengthBytes) / SecretConsumeRateBytes;
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public const int AccumulatorCount = StripeLengthBytes / sizeof( ulong );
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public const int MidSizeMaxBytes = 240;
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public const int InternalBufferStripes = InternalBufferLengthBytes / StripeLengthBytes;
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public const int InternalBufferLengthBytes = 256;
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/// <summary>The default secret for when no seed is provided.</summary>
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/// <remarks>This is the same as a custom secret derived from a seed of 0.</remarks>
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public static ReadOnlySpan<byte> DefaultSecret =>
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[
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0xb8, 0xfe, 0x6c, 0x39, 0x23, 0xa4, 0x4b, 0xbe, // DefaultSecretUInt64_0
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0x7c, 0x01, 0x81, 0x2c, 0xf7, 0x21, 0xad, 0x1c, // DefaultSecretUInt64_1
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0xde, 0xd4, 0x6d, 0xe9, 0x83, 0x90, 0x97, 0xdb, // DefaultSecretUInt64_2
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0x72, 0x40, 0xa4, 0xa4, 0xb7, 0xb3, 0x67, 0x1f, // DefaultSecretUInt64_3
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0xcb, 0x79, 0xe6, 0x4e, 0xcc, 0xc0, 0xe5, 0x78, // DefaultSecretUInt64_4
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0x82, 0x5a, 0xd0, 0x7d, 0xcc, 0xff, 0x72, 0x21, // DefaultSecretUInt64_5
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0xb8, 0x08, 0x46, 0x74, 0xf7, 0x43, 0x24, 0x8e, // DefaultSecretUInt64_6
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0xe0, 0x35, 0x90, 0xe6, 0x81, 0x3a, 0x26, 0x4c, // DefaultSecretUInt64_7
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0x3c, 0x28, 0x52, 0xbb, 0x91, 0xc3, 0x00, 0xcb, // DefaultSecretUInt64_8
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0x88, 0xd0, 0x65, 0x8b, 0x1b, 0x53, 0x2e, 0xa3, // DefaultSecretUInt64_9
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0x71, 0x64, 0x48, 0x97, 0xa2, 0x0d, 0xf9, 0x4e, // DefaultSecretUInt64_10
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0x38, 0x19, 0xef, 0x46, 0xa9, 0xde, 0xac, 0xd8, // DefaultSecretUInt64_11
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0xa8, 0xfa, 0x76, 0x3f, 0xe3, 0x9c, 0x34, 0x3f, // DefaultSecretUInt64_12
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0xf9, 0xdc, 0xbb, 0xc7, 0xc7, 0x0b, 0x4f, 0x1d, // DefaultSecretUInt64_13
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0x8a, 0x51, 0xe0, 0x4b, 0xcd, 0xb4, 0x59, 0x31, // DefaultSecretUInt64_14
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0xc8, 0x9f, 0x7e, 0xc9, 0xd9, 0x78, 0x73, 0x64, // DefaultSecretUInt64_15
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0xea, 0xc5, 0xac, 0x83, 0x34, 0xd3, 0xeb, 0xc3, // DefaultSecretUInt64_16
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0xc5, 0x81, 0xa0, 0xff, 0xfa, 0x13, 0x63, 0xeb, // DefaultSecretUInt64_17
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0x17, 0x0d, 0xdd, 0x51, 0xb7, 0xf0, 0xda, 0x49, // DefaultSecretUInt64_18
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0xd3, 0x16, 0x55, 0x26, 0x29, 0xd4, 0x68, 0x9e, // DefaultSecretUInt64_19
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0x2b, 0x16, 0xbe, 0x58, 0x7d, 0x47, 0xa1, 0xfc, // DefaultSecretUInt64_20
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0x8f, 0xf8, 0xb8, 0xd1, 0x7a, 0xd0, 0x31, 0xce, // DefaultSecretUInt64_21
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0x45, 0xcb, 0x3a, 0x8f, 0x95, 0x16, 0x04, 0x28, // DefaultSecretUInt64_22
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0xaf, 0xd7, 0xfb, 0xca, 0xbb, 0x4b, 0x40, 0x7e, // DefaultSecretUInt64_23
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];
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// Cast of DefaultSecret byte[] => ulong[] (See above for the correspondence)
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public const ulong DefaultSecretUInt64_0 = 0xBE4BA423396CFEB8;
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public const ulong DefaultSecretUInt64_1 = 0x1CAD21F72C81017C;
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public const ulong DefaultSecretUInt64_2 = 0xDB979083E96DD4DE;
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public const ulong DefaultSecretUInt64_3 = 0x1F67B3B7A4A44072;
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public const ulong DefaultSecretUInt64_4 = 0x78E5C0CC4EE679CB;
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public const ulong DefaultSecretUInt64_5 = 0x2172FFCC7DD05A82;
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public const ulong DefaultSecretUInt64_6 = 0x8E2443F7744608B8;
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public const ulong DefaultSecretUInt64_7 = 0x4C263A81E69035E0;
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public const ulong DefaultSecretUInt64_8 = 0xCB00C391BB52283C;
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public const ulong DefaultSecretUInt64_9 = 0xA32E531B8B65D088;
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public const ulong DefaultSecretUInt64_10 = 0x4EF90DA297486471;
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public const ulong DefaultSecretUInt64_11 = 0xD8ACDEA946EF1938;
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public const ulong DefaultSecretUInt64_12 = 0x3F349CE33F76FAA8;
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public const ulong DefaultSecretUInt64_13 = 0x1D4F0BC7C7BBDCF9;
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public const ulong DefaultSecretUInt64_14 = 0x3159B4CD4BE0518A;
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public const ulong DefaultSecretUInt64_15 = 0x647378D9C97E9FC8;
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// Cast of DefaultSecret offset by 3 bytes, byte[] => ulong[]
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public const ulong DefaultSecret3UInt64_0 = 0x81017CBE4BA42339;
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public const ulong DefaultSecret3UInt64_1 = 0x6DD4DE1CAD21F72C;
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public const ulong DefaultSecret3UInt64_2 = 0xA44072DB979083E9;
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public const ulong DefaultSecret3UInt64_3 = 0xE679CB1F67B3B7A4;
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public const ulong DefaultSecret3UInt64_4 = 0xD05A8278E5C0CC4E;
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public const ulong DefaultSecret3UInt64_5 = 0x4608B82172FFCC7D;
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public const ulong DefaultSecret3UInt64_6 = 0x9035E08E2443F774;
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public const ulong DefaultSecret3UInt64_7 = 0x52283C4C263A81E6;
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public const ulong DefaultSecret3UInt64_8 = 0x65D088CB00C391BB;
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public const ulong DefaultSecret3UInt64_9 = 0x486471A32E531B8B;
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public const ulong DefaultSecret3UInt64_10 = 0xEF19384EF90DA297;
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public const ulong DefaultSecret3UInt64_11 = 0x76FAA8D8ACDEA946;
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public const ulong DefaultSecret3UInt64_12 = 0xBBDCF93F349CE33F;
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public const ulong DefaultSecret3UInt64_13 = 0xE0518A1D4F0BC7C7;
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public const ulong Prime64_1 = 0x9E3779B185EBCA87UL;
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public const ulong Prime64_2 = 0xC2B2AE3D27D4EB4FUL;
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public const ulong Prime64_3 = 0x165667B19E3779F9UL;
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public const ulong Prime64_4 = 0x85EBCA77C2B2AE63UL;
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public const ulong Prime64_5 = 0x27D4EB2F165667C5UL;
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public const uint Prime32_1 = 0x9E3779B1U;
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public const uint Prime32_2 = 0x85EBCA77U;
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public const uint Prime32_3 = 0xC2B2AE3DU;
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public const uint Prime32_4 = 0x27D4EB2FU;
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public const uint Prime32_5 = 0x165667B1U;
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#if DEBUG
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static XxHashShared()
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{
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// Make sure DefaultSecret is the custom secret derived from a seed of 0.
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byte* secret = stackalloc byte[SecretLengthBytes];
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DeriveSecretFromSeed( secret, 0 );
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Debug.Assert( new Span<byte>( secret, SecretLengthBytes ).SequenceEqual( DefaultSecret ) );
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// Validate some relationships.
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Debug.Assert( InternalBufferLengthBytes % StripeLengthBytes == 0 );
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ReadOnlySpan<ulong> defaultSecretUInt64 = MemoryMarshal.Cast<byte, ulong>( DefaultSecret );
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Debug.Assert( ReadLE64( defaultSecretUInt64[0] ) == DefaultSecretUInt64_0 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[1] ) == DefaultSecretUInt64_1 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[2] ) == DefaultSecretUInt64_2 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[3] ) == DefaultSecretUInt64_3 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[4] ) == DefaultSecretUInt64_4 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[5] ) == DefaultSecretUInt64_5 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[6] ) == DefaultSecretUInt64_6 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[7] ) == DefaultSecretUInt64_7 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[8] ) == DefaultSecretUInt64_8 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[9] ) == DefaultSecretUInt64_9 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[10] ) == DefaultSecretUInt64_10 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[11] ) == DefaultSecretUInt64_11 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[12] ) == DefaultSecretUInt64_12 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[13] ) == DefaultSecretUInt64_13 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[14] ) == DefaultSecretUInt64_14 );
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Debug.Assert( ReadLE64( defaultSecretUInt64[15] ) == DefaultSecretUInt64_15 );
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ReadOnlySpan<ulong> defaultSecret3UInt64 = MemoryMarshal.Cast<byte, ulong>( DefaultSecret.Slice( 3 ) );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[0] ) == DefaultSecret3UInt64_0 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[1] ) == DefaultSecret3UInt64_1 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[2] ) == DefaultSecret3UInt64_2 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[3] ) == DefaultSecret3UInt64_3 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[4] ) == DefaultSecret3UInt64_4 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[5] ) == DefaultSecret3UInt64_5 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[6] ) == DefaultSecret3UInt64_6 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[7] ) == DefaultSecret3UInt64_7 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[8] ) == DefaultSecret3UInt64_8 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[9] ) == DefaultSecret3UInt64_9 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[10] ) == DefaultSecret3UInt64_10 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[11] ) == DefaultSecret3UInt64_11 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[12] ) == DefaultSecret3UInt64_12 );
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Debug.Assert( ReadLE64( defaultSecret3UInt64[13] ) == DefaultSecret3UInt64_13 );
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static ulong ReadLE64( ulong data ) => BitConverter.IsLittleEndian ? data : BinaryPrimitives.ReverseEndianness( data );
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}
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#endif
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public static void Initialize( ref State state, ulong seed )
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{
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state.Seed = seed;
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fixed ( byte* secret = state.Secret )
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{
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if ( seed == 0 )
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{
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DefaultSecret.CopyTo( new Span<byte>( secret, SecretLengthBytes ) );
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}
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else
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{
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DeriveSecretFromSeed( secret, seed );
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}
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}
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Reset( ref state );
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}
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public static void Reset( ref State state )
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{
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state.BufferedCount = 0;
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state.StripesProcessedInCurrentBlock = 0;
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state.TotalLength = 0;
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fixed ( ulong* accumulators = state.Accumulators )
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{
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InitializeAccumulators( accumulators );
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}
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}
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/// <summary>"This is a stronger avalanche, preferable when input has not been previously mixed."</summary>
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[MethodImpl( MethodImplOptions.AggressiveInlining )]
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public static ulong Rrmxmx( ulong hash, uint length )
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{
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hash ^= RotateLeft( hash, 49 ) ^ RotateLeft( hash, 24 );
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hash *= 0x9FB21C651E98DF25;
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hash ^= (hash >> 35) + length;
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hash *= 0x9FB21C651E98DF25;
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return XorShift( hash, 28 );
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}
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private static ulong RotateLeft( ulong value, int count ) => (value << count) | (value >> (64 - count));
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public static void HashInternalLoop( ulong* accumulators, byte* source, uint length, byte* secret )
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{
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Debug.Assert( length > 240 );
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const int StripesPerBlock = (SecretLengthBytes - StripeLengthBytes) / SecretConsumeRateBytes;
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const int BlockLen = StripeLengthBytes * StripesPerBlock;
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int blocksNum = (int)((length - 1) / BlockLen);
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Accumulate( accumulators, source, secret, StripesPerBlock, true, blocksNum );
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int offset = BlockLen * blocksNum;
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int stripesNumber = (int)((length - 1 - offset) / StripeLengthBytes);
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Accumulate( accumulators, source + offset, secret, stripesNumber );
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Accumulate512( accumulators, source + length - StripeLengthBytes, secret + (SecretLengthBytes - StripeLengthBytes - SecretLastAccStartBytes) );
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}
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public static void ConsumeStripes( ulong* accumulators, ref ulong stripesSoFar, ulong stripesPerBlock, byte* source, ulong stripes, byte* secret )
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{
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Debug.Assert( stripes <= stripesPerBlock ); // can handle max 1 scramble per invocation
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Debug.Assert( stripesSoFar < stripesPerBlock );
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ulong stripesToEndOfBlock = stripesPerBlock - stripesSoFar;
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if ( stripesToEndOfBlock <= stripes )
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{
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// need a scrambling operation
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ulong stripesAfterBlock = stripes - stripesToEndOfBlock;
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Accumulate( accumulators, source, secret + ((int)stripesSoFar * SecretConsumeRateBytes), (int)stripesToEndOfBlock );
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ScrambleAccumulators( accumulators, secret + (SecretLengthBytes - StripeLengthBytes) );
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Accumulate( accumulators, source + ((int)stripesToEndOfBlock * StripeLengthBytes), secret, (int)stripesAfterBlock );
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stripesSoFar = stripesAfterBlock;
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}
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else
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{
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Accumulate( accumulators, source, secret + ((int)stripesSoFar * SecretConsumeRateBytes), (int)stripes );
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stripesSoFar += stripes;
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}
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}
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public static void Append( ref State state, ReadOnlySpan<byte> source )
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{
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Debug.Assert( state.BufferedCount <= InternalBufferLengthBytes );
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state.TotalLength += (uint)source.Length;
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fixed ( byte* buffer = state.Buffer )
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{
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// Small input: just copy the data to the buffer.
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if ( source.Length <= InternalBufferLengthBytes - state.BufferedCount )
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{
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source.CopyTo( new Span<byte>( buffer + state.BufferedCount, source.Length ) );
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state.BufferedCount += (uint)source.Length;
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return;
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}
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fixed ( byte* secret = state.Secret )
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fixed ( ulong* accumulators = state.Accumulators )
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fixed ( byte* sourcePtr = &MemoryMarshal.GetReference( source ) )
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{
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// Internal buffer is partially filled (always, except at beginning). Complete it, then consume it.
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int sourceIndex = 0;
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if ( state.BufferedCount != 0 )
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{
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int loadSize = InternalBufferLengthBytes - (int)state.BufferedCount;
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source.Slice( 0, loadSize ).CopyTo( new Span<byte>( buffer + state.BufferedCount, loadSize ) );
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sourceIndex = loadSize;
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ConsumeStripes( accumulators, ref state.StripesProcessedInCurrentBlock, NumStripesPerBlock, buffer, InternalBufferStripes, secret );
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state.BufferedCount = 0;
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}
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Debug.Assert( sourceIndex < source.Length );
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// Large input to consume: ingest per full block.
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if ( source.Length - sourceIndex > NumStripesPerBlock * StripeLengthBytes )
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{
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ulong stripes = (ulong)(source.Length - sourceIndex - 1) / StripeLengthBytes;
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Debug.Assert( NumStripesPerBlock >= state.StripesProcessedInCurrentBlock );
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// Join to current block's end.
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ulong stripesToEnd = NumStripesPerBlock - state.StripesProcessedInCurrentBlock;
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Debug.Assert( stripesToEnd <= stripes );
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Accumulate( accumulators, sourcePtr + sourceIndex, secret + ((int)state.StripesProcessedInCurrentBlock * SecretConsumeRateBytes), (int)stripesToEnd );
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ScrambleAccumulators( accumulators, secret + (SecretLengthBytes - StripeLengthBytes) );
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state.StripesProcessedInCurrentBlock = 0;
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sourceIndex += (int)stripesToEnd * StripeLengthBytes;
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stripes -= stripesToEnd;
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// Consume entire blocks.
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while ( stripes >= NumStripesPerBlock )
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{
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Accumulate( accumulators, sourcePtr + sourceIndex, secret, NumStripesPerBlock );
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ScrambleAccumulators( accumulators, secret + (SecretLengthBytes - StripeLengthBytes) );
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sourceIndex += NumStripesPerBlock * StripeLengthBytes;
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stripes -= NumStripesPerBlock;
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}
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// Consume complete stripes in the last partial block.
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Accumulate( accumulators, sourcePtr + sourceIndex, secret, (int)stripes );
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sourceIndex += (int)stripes * StripeLengthBytes;
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Debug.Assert( sourceIndex < source.Length ); // at least some bytes left
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state.StripesProcessedInCurrentBlock = stripes;
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// Copy the last stripe into the end of the buffer so it is available to GetCurrentHashCore when processing the "stripe from the end".
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source.Slice( sourceIndex - StripeLengthBytes, StripeLengthBytes ).CopyTo( new Span<byte>( buffer + InternalBufferLengthBytes - StripeLengthBytes, StripeLengthBytes ) );
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}
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else if ( source.Length - sourceIndex > InternalBufferLengthBytes )
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{
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// Content to consume <= block size. Consume source by a multiple of internal buffer size.
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do
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{
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ConsumeStripes( accumulators, ref state.StripesProcessedInCurrentBlock, NumStripesPerBlock, sourcePtr + sourceIndex, InternalBufferStripes, secret );
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sourceIndex += InternalBufferLengthBytes;
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}
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while ( source.Length - sourceIndex > InternalBufferLengthBytes );
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// Copy the last stripe into the end of the buffer so it is available to GetCurrentHashCore when processing the "stripe from the end".
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source.Slice( sourceIndex - StripeLengthBytes, StripeLengthBytes ).CopyTo( new Span<byte>( buffer + InternalBufferLengthBytes - StripeLengthBytes, StripeLengthBytes ) );
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}
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// Buffer the remaining input.
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Span<byte> remaining = new Span<byte>( buffer, source.Length - sourceIndex );
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Debug.Assert( sourceIndex < source.Length );
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Debug.Assert( remaining.Length <= InternalBufferLengthBytes );
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Debug.Assert( state.BufferedCount == 0 );
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source.Slice( sourceIndex ).CopyTo( remaining );
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state.BufferedCount = (uint)remaining.Length;
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}
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}
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}
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public static void CopyAccumulators( ref State state, ulong* accumulators )
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{
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fixed ( ulong* stateAccumulators = state.Accumulators )
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{
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#if NET
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if (Vector256.IsHardwareAccelerated)
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{
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Vector256.Store(Vector256.Load(stateAccumulators), accumulators);
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Vector256.Store(Vector256.Load(stateAccumulators + 4), accumulators + 4);
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}
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else if (Vector128.IsHardwareAccelerated)
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{
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Vector128.Store(Vector128.Load(stateAccumulators), accumulators);
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Vector128.Store(Vector128.Load(stateAccumulators + 2), accumulators + 2);
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Vector128.Store(Vector128.Load(stateAccumulators + 4), accumulators + 4);
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Vector128.Store(Vector128.Load(stateAccumulators + 6), accumulators + 6);
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}
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else
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#endif
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{
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for ( int i = 0; i < 8; i++ )
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{
|
|
accumulators[i] = stateAccumulators[i];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public static void DigestLong( ref State state, ulong* accumulators, byte* secret )
|
|
{
|
|
Debug.Assert( state.BufferedCount > 0 );
|
|
|
|
fixed ( byte* buffer = state.Buffer )
|
|
{
|
|
byte* accumulateData;
|
|
if ( state.BufferedCount >= StripeLengthBytes )
|
|
{
|
|
uint stripes = (state.BufferedCount - 1) / StripeLengthBytes;
|
|
ulong stripesSoFar = state.StripesProcessedInCurrentBlock;
|
|
|
|
ConsumeStripes( accumulators, ref stripesSoFar, NumStripesPerBlock, buffer, stripes, secret );
|
|
|
|
accumulateData = buffer + state.BufferedCount - StripeLengthBytes;
|
|
}
|
|
else
|
|
{
|
|
byte* lastStripe = stackalloc byte[StripeLengthBytes];
|
|
int catchupSize = StripeLengthBytes - (int)state.BufferedCount;
|
|
|
|
new ReadOnlySpan<byte>( buffer + InternalBufferLengthBytes - catchupSize, catchupSize ).CopyTo( new Span<byte>( lastStripe, StripeLengthBytes ) );
|
|
new ReadOnlySpan<byte>( buffer, (int)state.BufferedCount ).CopyTo( new Span<byte>( lastStripe + catchupSize, (int)state.BufferedCount ) );
|
|
accumulateData = lastStripe;
|
|
}
|
|
|
|
Accumulate512( accumulators, accumulateData, secret + (SecretLengthBytes - StripeLengthBytes - SecretLastAccStartBytes) );
|
|
}
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static void InitializeAccumulators( ulong* accumulators )
|
|
{
|
|
#if NET
|
|
if (Vector256.IsHardwareAccelerated)
|
|
{
|
|
Vector256.Store(Vector256.Create(Prime32_3, Prime64_1, Prime64_2, Prime64_3), accumulators);
|
|
Vector256.Store(Vector256.Create(Prime64_4, Prime32_2, Prime64_5, Prime32_1), accumulators + 4);
|
|
}
|
|
else if (Vector128.IsHardwareAccelerated)
|
|
{
|
|
Vector128.Store(Vector128.Create(Prime32_3, Prime64_1), accumulators);
|
|
Vector128.Store(Vector128.Create(Prime64_2, Prime64_3), accumulators + 2);
|
|
Vector128.Store(Vector128.Create(Prime64_4, Prime32_2), accumulators + 4);
|
|
Vector128.Store(Vector128.Create(Prime64_5, Prime32_1), accumulators + 6);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
accumulators[0] = Prime32_3;
|
|
accumulators[1] = Prime64_1;
|
|
accumulators[2] = Prime64_2;
|
|
accumulators[3] = Prime64_3;
|
|
accumulators[4] = Prime64_4;
|
|
accumulators[5] = Prime32_2;
|
|
accumulators[6] = Prime64_5;
|
|
accumulators[7] = Prime32_1;
|
|
}
|
|
}
|
|
|
|
public static ulong MergeAccumulators( ulong* accumulators, byte* secret, ulong start )
|
|
{
|
|
ulong result64 = start;
|
|
|
|
result64 += Multiply64To128ThenFold( accumulators[0] ^ ReadUInt64LE( secret ), accumulators[1] ^ ReadUInt64LE( secret + 8 ) );
|
|
result64 += Multiply64To128ThenFold( accumulators[2] ^ ReadUInt64LE( secret + 16 ), accumulators[3] ^ ReadUInt64LE( secret + 24 ) );
|
|
result64 += Multiply64To128ThenFold( accumulators[4] ^ ReadUInt64LE( secret + 32 ), accumulators[5] ^ ReadUInt64LE( secret + 40 ) );
|
|
result64 += Multiply64To128ThenFold( accumulators[6] ^ ReadUInt64LE( secret + 48 ), accumulators[7] ^ ReadUInt64LE( secret + 56 ) );
|
|
|
|
return Avalanche( result64 );
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong Mix16Bytes( byte* source, ulong secretLow, ulong secretHigh, ulong seed ) =>
|
|
Multiply64To128ThenFold(
|
|
ReadUInt64LE( source ) ^ (secretLow + seed),
|
|
ReadUInt64LE( source + sizeof( ulong ) ) ^ (secretHigh - seed) );
|
|
|
|
/// <summary>Calculates a 32-bit to 64-bit long multiply.</summary>
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong Multiply32To64( uint v1, uint v2 ) => (ulong)v1 * v2;
|
|
|
|
/// <summary>"This is a fast avalanche stage, suitable when input bits are already partially mixed."</summary>
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong Avalanche( ulong hash )
|
|
{
|
|
hash = XorShift( hash, 37 );
|
|
hash *= 0x165667919E3779F9;
|
|
hash = XorShift( hash, 32 );
|
|
return hash;
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong Multiply64To128( ulong left, ulong right, out ulong lower )
|
|
{
|
|
#if NET
|
|
return Math.BigMul(left, right, out lower);
|
|
#else
|
|
ulong lowerLow = Multiply32To64( (uint)left, (uint)right );
|
|
ulong higherLow = Multiply32To64( (uint)(left >> 32), (uint)right );
|
|
ulong lowerHigh = Multiply32To64( (uint)left, (uint)(right >> 32) );
|
|
ulong higherHigh = Multiply32To64( (uint)(left >> 32), (uint)(right >> 32) );
|
|
|
|
ulong cross = (lowerLow >> 32) + (higherLow & 0xFFFFFFFF) + lowerHigh;
|
|
ulong upper = (higherLow >> 32) + (cross >> 32) + higherHigh;
|
|
lower = (cross << 32) | (lowerLow & 0xFFFFFFFF);
|
|
return upper;
|
|
#endif
|
|
}
|
|
|
|
/// <summary>Calculates a 64-bit to 128-bit multiply, then XOR folds it.</summary>
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong Multiply64To128ThenFold( ulong left, ulong right )
|
|
{
|
|
ulong upper = Multiply64To128( left, right, out ulong lower );
|
|
return lower ^ upper;
|
|
}
|
|
|
|
public static void DeriveSecretFromSeed( byte* destinationSecret, ulong seed )
|
|
{
|
|
fixed ( byte* defaultSecret = &MemoryMarshal.GetReference( DefaultSecret ) )
|
|
{
|
|
#if NET
|
|
if (Vector256.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
Vector256<ulong> seedVec = Vector256.Create(seed, 0u - seed, seed, 0u - seed);
|
|
for (int i = 0; i < SecretLengthBytes; i += Vector256<byte>.Count)
|
|
{
|
|
Vector256.Store(Vector256.Load((ulong*)(defaultSecret + i)) + seedVec, (ulong*)(destinationSecret + i));
|
|
}
|
|
}
|
|
else if (Vector128.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
Vector128<ulong> seedVec = Vector128.Create(seed, 0u - seed);
|
|
for (int i = 0; i < SecretLengthBytes; i += Vector128<byte>.Count)
|
|
{
|
|
Vector128.Store(Vector128.Load((ulong*)(defaultSecret + i)) + seedVec, (ulong*)(destinationSecret + i));
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
for ( int i = 0; i < SecretLengthBytes; i += sizeof( ulong ) * 2 )
|
|
{
|
|
WriteUInt64LE( destinationSecret + i, ReadUInt64LE( defaultSecret + i ) + seed );
|
|
WriteUInt64LE( destinationSecret + i + 8, ReadUInt64LE( defaultSecret + i + 8 ) - seed );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>Optimized version of looping over <see cref="Accumulate512"/>.</summary>
|
|
[MethodImpl( MethodImplOptions.NoInlining )]
|
|
private static void Accumulate( ulong* accumulators, byte* source, byte* secret, int stripesToProcess, bool scramble = false, int blockCount = 1 )
|
|
{
|
|
byte* secretForAccumulate = secret;
|
|
byte* secretForScramble = secret + (SecretLengthBytes - StripeLengthBytes);
|
|
|
|
#if NET
|
|
if (Vector256.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
Vector256<ulong> acc1 = Vector256.Load(accumulators);
|
|
Vector256<ulong> acc2 = Vector256.Load(accumulators + Vector256<ulong>.Count);
|
|
|
|
for (int j = 0; j < blockCount; j++)
|
|
{
|
|
secret = secretForAccumulate;
|
|
for (int i = 0; i < stripesToProcess; i++)
|
|
{
|
|
Vector256<uint> secretVal = Vector256.Load((uint*)secret);
|
|
acc1 = Accumulate256(acc1, source, secretVal);
|
|
source += Vector256<byte>.Count;
|
|
|
|
secretVal = Vector256.Load((uint*)secret + Vector256<uint>.Count);
|
|
acc2 = Accumulate256(acc2, source, secretVal);
|
|
source += Vector256<byte>.Count;
|
|
|
|
secret += SecretConsumeRateBytes;
|
|
}
|
|
|
|
if (scramble)
|
|
{
|
|
acc1 = ScrambleAccumulator256(acc1, Vector256.Load((ulong*)secretForScramble));
|
|
acc2 = ScrambleAccumulator256(acc2, Vector256.Load((ulong*)secretForScramble + Vector256<ulong>.Count));
|
|
}
|
|
}
|
|
|
|
Vector256.Store(acc1, accumulators);
|
|
Vector256.Store(acc2, accumulators + Vector256<ulong>.Count);
|
|
}
|
|
else if (Vector128.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
Vector128<ulong> acc1 = Vector128.Load(accumulators);
|
|
Vector128<ulong> acc2 = Vector128.Load(accumulators + Vector128<ulong>.Count);
|
|
Vector128<ulong> acc3 = Vector128.Load(accumulators + Vector128<ulong>.Count * 2);
|
|
Vector128<ulong> acc4 = Vector128.Load(accumulators + Vector128<ulong>.Count * 3);
|
|
|
|
for (int j = 0; j < blockCount; j++)
|
|
{
|
|
secret = secretForAccumulate;
|
|
for (int i = 0; i < stripesToProcess; i++)
|
|
{
|
|
Vector128<uint> secretVal = Vector128.Load((uint*)secret);
|
|
acc1 = Accumulate128(acc1, source, secretVal);
|
|
source += Vector128<byte>.Count;
|
|
|
|
secretVal = Vector128.Load((uint*)secret + Vector128<uint>.Count);
|
|
acc2 = Accumulate128(acc2, source, secretVal);
|
|
source += Vector128<byte>.Count;
|
|
|
|
secretVal = Vector128.Load((uint*)secret + Vector128<uint>.Count * 2);
|
|
acc3 = Accumulate128(acc3, source, secretVal);
|
|
source += Vector128<byte>.Count;
|
|
|
|
secretVal = Vector128.Load((uint*)secret + Vector128<uint>.Count * 3);
|
|
acc4 = Accumulate128(acc4, source, secretVal);
|
|
source += Vector128<byte>.Count;
|
|
|
|
secret += SecretConsumeRateBytes;
|
|
}
|
|
|
|
if (scramble)
|
|
{
|
|
acc1 = ScrambleAccumulator128(acc1, Vector128.Load((ulong*)secretForScramble));
|
|
acc2 = ScrambleAccumulator128(acc2, Vector128.Load((ulong*)secretForScramble + Vector128<ulong>.Count));
|
|
acc3 = ScrambleAccumulator128(acc3, Vector128.Load((ulong*)secretForScramble + Vector128<ulong>.Count * 2));
|
|
acc4 = ScrambleAccumulator128(acc4, Vector128.Load((ulong*)secretForScramble + Vector128<ulong>.Count * 3));
|
|
}
|
|
}
|
|
|
|
Vector128.Store(acc1, accumulators);
|
|
Vector128.Store(acc2, accumulators + Vector128<ulong>.Count);
|
|
Vector128.Store(acc3, accumulators + Vector128<ulong>.Count * 2);
|
|
Vector128.Store(acc4, accumulators + Vector128<ulong>.Count * 3);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
for ( int j = 0; j < blockCount; j++ )
|
|
{
|
|
for ( int i = 0; i < stripesToProcess; i++ )
|
|
{
|
|
Accumulate512Inlined( accumulators, source, secret + (i * SecretConsumeRateBytes) );
|
|
source += StripeLengthBytes;
|
|
}
|
|
|
|
if ( scramble )
|
|
{
|
|
ScrambleAccumulators( accumulators, secretForScramble );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.NoInlining )]
|
|
public static void Accumulate512( ulong* accumulators, byte* source, byte* secret )
|
|
{
|
|
Accumulate512Inlined( accumulators, source, secret );
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
private static void Accumulate512Inlined( ulong* accumulators, byte* source, byte* secret )
|
|
{
|
|
#if NET
|
|
if (Vector256.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
for (int i = 0; i < AccumulatorCount / Vector256<ulong>.Count; i++)
|
|
{
|
|
Vector256<ulong> accVec = Accumulate256(Vector256.Load(accumulators), source, Vector256.Load((uint*)secret));
|
|
Vector256.Store(accVec, accumulators);
|
|
|
|
accumulators += Vector256<ulong>.Count;
|
|
secret += Vector256<byte>.Count;
|
|
source += Vector256<byte>.Count;
|
|
}
|
|
}
|
|
else if (Vector128.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
for (int i = 0; i < AccumulatorCount / Vector128<ulong>.Count; i++)
|
|
{
|
|
Vector128<ulong> accVec = Accumulate128(Vector128.Load(accumulators), source, Vector128.Load((uint*)secret));
|
|
Vector128.Store(accVec, accumulators);
|
|
|
|
accumulators += Vector128<ulong>.Count;
|
|
secret += Vector128<byte>.Count;
|
|
source += Vector128<byte>.Count;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
for ( int i = 0; i < AccumulatorCount; i++ )
|
|
{
|
|
ulong sourceVal = ReadUInt64LE( source + (8 * i) );
|
|
ulong sourceKey = sourceVal ^ ReadUInt64LE( secret + (i * 8) );
|
|
|
|
accumulators[i ^ 1] += sourceVal; // swap adjacent lanes
|
|
accumulators[i] += Multiply32To64( (uint)sourceKey, (uint)(sourceKey >> 32) );
|
|
}
|
|
}
|
|
}
|
|
|
|
#if NET
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static Vector256<ulong> Accumulate256(Vector256<ulong> accVec, byte* source, Vector256<uint> secret)
|
|
{
|
|
Vector256<uint> sourceVec = Vector256.Load((uint*)source);
|
|
Vector256<uint> sourceKey = sourceVec ^ secret;
|
|
|
|
// TODO: Figure out how to unwind this shuffle and just use Vector256.Multiply
|
|
Vector256<uint> sourceKeyLow = Vector256.Shuffle(sourceKey, Vector256.Create(1u, 0, 3, 0, 5, 0, 7, 0));
|
|
Vector256<uint> sourceSwap = Vector256.Shuffle(sourceVec, Vector256.Create(2u, 3, 0, 1, 6, 7, 4, 5));
|
|
Vector256<ulong> sum = accVec + sourceSwap.AsUInt64();
|
|
Vector256<ulong> product = Avx2.IsSupported ?
|
|
Avx2.Multiply(sourceKey, sourceKeyLow) :
|
|
(sourceKey & Vector256.Create(~0u, 0u, ~0u, 0u, ~0u, 0u, ~0u, 0u)).AsUInt64() * (sourceKeyLow & Vector256.Create(~0u, 0u, ~0u, 0u, ~0u, 0u, ~0u, 0u)).AsUInt64();
|
|
|
|
accVec = product + sum;
|
|
return accVec;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static Vector128<ulong> Accumulate128(Vector128<ulong> accVec, byte* source, Vector128<uint> secret)
|
|
{
|
|
Vector128<uint> sourceVec = Vector128.Load((uint*)source);
|
|
Vector128<uint> sourceKey = sourceVec ^ secret;
|
|
|
|
// TODO: Figure out how to unwind this shuffle and just use Vector128.Multiply
|
|
Vector128<uint> sourceSwap = Vector128.Shuffle(sourceVec, Vector128.Create(2u, 3, 0, 1));
|
|
Vector128<ulong> sum = accVec + sourceSwap.AsUInt64();
|
|
|
|
Vector128<ulong> product = MultiplyWideningLower(sourceKey);
|
|
accVec = product + sum;
|
|
return accVec;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static Vector128<ulong> MultiplyWideningLower(Vector128<uint> source)
|
|
{
|
|
if (AdvSimd.IsSupported)
|
|
{
|
|
Vector64<uint> sourceLow = Vector128.Shuffle(source, Vector128.Create(0u, 2, 0, 0)).GetLower();
|
|
Vector64<uint> sourceHigh = Vector128.Shuffle(source, Vector128.Create(1u, 3, 0, 0)).GetLower();
|
|
return AdvSimd.MultiplyWideningLower(sourceLow, sourceHigh);
|
|
}
|
|
else
|
|
{
|
|
Vector128<uint> sourceLow = Vector128.Shuffle(source, Vector128.Create(1u, 0, 3, 0));
|
|
return Sse2.IsSupported ?
|
|
Sse2.Multiply(source, sourceLow) :
|
|
(source & Vector128.Create(~0u, 0u, ~0u, 0u)).AsUInt64() * (sourceLow & Vector128.Create(~0u, 0u, ~0u, 0u)).AsUInt64();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
private static void ScrambleAccumulators( ulong* accumulators, byte* secret )
|
|
{
|
|
#if NET
|
|
if (Vector256.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
for (int i = 0; i < AccumulatorCount / Vector256<ulong>.Count; i++)
|
|
{
|
|
Vector256<ulong> accVec = ScrambleAccumulator256(Vector256.Load(accumulators), Vector256.Load((ulong*)secret));
|
|
Vector256.Store(accVec, accumulators);
|
|
|
|
accumulators += Vector256<ulong>.Count;
|
|
secret += Vector256<byte>.Count;
|
|
}
|
|
}
|
|
else if (Vector128.IsHardwareAccelerated && BitConverter.IsLittleEndian)
|
|
{
|
|
for (int i = 0; i < AccumulatorCount / Vector128<ulong>.Count; i++)
|
|
{
|
|
Vector128<ulong> accVec = ScrambleAccumulator128(Vector128.Load(accumulators), Vector128.Load((ulong*)secret));
|
|
Vector128.Store(accVec, accumulators);
|
|
|
|
accumulators += Vector128<ulong>.Count;
|
|
secret += Vector128<byte>.Count;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
for ( int i = 0; i < AccumulatorCount; i++ )
|
|
{
|
|
ulong xorShift = XorShift( *accumulators, 47 );
|
|
ulong xorWithKey = xorShift ^ ReadUInt64LE( secret );
|
|
*accumulators = xorWithKey * Prime32_1;
|
|
|
|
accumulators++;
|
|
secret += sizeof( ulong );
|
|
}
|
|
}
|
|
}
|
|
|
|
#if NET
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static Vector256<ulong> ScrambleAccumulator256(Vector256<ulong> accVec, Vector256<ulong> secret)
|
|
{
|
|
Vector256<ulong> xorShift = accVec ^ Vector256.ShiftRightLogical(accVec, 47);
|
|
Vector256<ulong> xorWithKey = xorShift ^ secret;
|
|
accVec = xorWithKey * Vector256.Create((ulong)Prime32_1);
|
|
return accVec;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static Vector128<ulong> ScrambleAccumulator128(Vector128<ulong> accVec, Vector128<ulong> secret)
|
|
{
|
|
Vector128<ulong> xorShift = accVec ^ Vector128.ShiftRightLogical(accVec, 47);
|
|
Vector128<ulong> xorWithKey = xorShift ^ secret;
|
|
accVec = xorWithKey * Vector128.Create((ulong)Prime32_1);
|
|
return accVec;
|
|
}
|
|
#endif
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong XorShift( ulong value, int shift )
|
|
{
|
|
Debug.Assert( shift >= 0 && shift < 64 );
|
|
return value ^ (value >> shift);
|
|
}
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static uint ReadUInt32LE( byte* data ) =>
|
|
BitConverter.IsLittleEndian ?
|
|
Unsafe.ReadUnaligned<uint>( data ) :
|
|
BinaryPrimitives.ReverseEndianness( Unsafe.ReadUnaligned<uint>( data ) );
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
public static ulong ReadUInt64LE( byte* data ) =>
|
|
BitConverter.IsLittleEndian ?
|
|
Unsafe.ReadUnaligned<ulong>( data ) :
|
|
BinaryPrimitives.ReverseEndianness( Unsafe.ReadUnaligned<ulong>( data ) );
|
|
|
|
[MethodImpl( MethodImplOptions.AggressiveInlining )]
|
|
private static void WriteUInt64LE( byte* data, ulong value )
|
|
{
|
|
if ( !BitConverter.IsLittleEndian )
|
|
{
|
|
value = BinaryPrimitives.ReverseEndianness( value );
|
|
}
|
|
Unsafe.WriteUnaligned( data, value );
|
|
}
|
|
|
|
[StructLayout( LayoutKind.Auto )]
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|
public struct State
|
|
{
|
|
/// <summary>The accumulators. Length is <see cref="AccumulatorCount"/>.</summary>
|
|
internal fixed ulong Accumulators[AccumulatorCount];
|
|
|
|
/// <summary>Used to store a custom secret generated from a seed. Length is <see cref="SecretLengthBytes"/>.</summary>
|
|
internal fixed byte Secret[SecretLengthBytes];
|
|
|
|
/// <summary>The internal buffer. Length is <see cref="InternalBufferLengthBytes"/>.</summary>
|
|
internal fixed byte Buffer[InternalBufferLengthBytes];
|
|
|
|
/// <summary>The amount of memory in <see cref="Buffer"/>.</summary>
|
|
internal uint BufferedCount;
|
|
|
|
/// <summary>Number of stripes processed in the current block.</summary>
|
|
internal ulong StripesProcessedInCurrentBlock;
|
|
|
|
/// <summary>Total length hashed.</summary>
|
|
internal ulong TotalLength;
|
|
|
|
/// <summary>The seed employed (possibly 0).</summary>
|
|
internal ulong Seed;
|
|
};
|
|
}
|