125 lines
6.7 KiB
C#
125 lines
6.7 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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using System;
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using System.Runtime.CompilerServices;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
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#if BESTHTTP_WITH_BURST
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using Unity.Burst;
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#endif
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namespace BestHTTP.Connections.TLS.Crypto.Impl
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{
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#if BESTHTTP_WITH_BURST
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[Unity.Burst.BurstCompile]
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#endif
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internal static class FastChaChaEngineHelper
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{
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internal unsafe static void ChachaCore(int rounds, uint[] input, byte[] output)
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{
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fixed (uint* pinput = input)
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fixed (byte* poutput = output)
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ChachaCoreImpl(rounds, pinput, poutput);
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}
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#if BESTHTTP_WITH_BURST
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[Unity.Burst.BurstCompile]
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[Unity.Burst.CompilerServices.SkipLocalsInit]
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#endif
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internal unsafe static void ChachaCoreImpl(int rounds,
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#if BESTHTTP_WITH_BURST
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[NoAlias]
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#endif
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uint* input,
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#if BESTHTTP_WITH_BURST
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[NoAlias]
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#endif
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byte* output)
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{
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uint* x = stackalloc uint[16];
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for (int i = 0; i < 16; i++)
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x[i] = input[i];
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uint tmp = 0;
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for (int i = rounds; i > 0; i -= 2)
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{
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x[00] += x[04]; tmp = x[12] ^ x[00]; x[12] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[12] ^ x[00], 16);
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x[01] += x[05]; tmp = x[13] ^ x[01]; x[13] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[13] ^ x[01], 16);
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x[02] += x[06]; tmp = x[14] ^ x[02]; x[14] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[14] ^ x[02], 16);
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x[03] += x[07]; tmp = x[15] ^ x[03]; x[15] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[15] ^ x[03], 16);
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x[08] += x[12]; tmp = x[04] ^ x[08]; x[04] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[04] ^ x[08], 12);
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x[09] += x[13]; tmp = x[05] ^ x[09]; x[05] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[05] ^ x[09], 12);
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x[10] += x[14]; tmp = x[06] ^ x[10]; x[06] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[06] ^ x[10], 12);
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x[11] += x[15]; tmp = x[07] ^ x[11]; x[07] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[07] ^ x[11], 12);
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x[00] += x[04]; tmp = x[12] ^ x[00]; x[12] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[12] ^ x[00], 8);
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x[01] += x[05]; tmp = x[13] ^ x[01]; x[13] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[13] ^ x[01], 8);
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x[02] += x[06]; tmp = x[14] ^ x[02]; x[14] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[14] ^ x[02], 8);
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x[03] += x[07]; tmp = x[15] ^ x[03]; x[15] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[15] ^ x[03], 8);
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x[08] += x[12]; tmp = x[04] ^ x[08]; x[04] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[04] ^ x[08], 7);
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x[09] += x[13]; tmp = x[05] ^ x[09]; x[05] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[05] ^ x[09], 7);
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x[10] += x[14]; tmp = x[06] ^ x[10]; x[06] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[06] ^ x[10], 7);
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x[11] += x[15]; tmp = x[07] ^ x[11]; x[07] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[07] ^ x[11], 7);
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x[00] += x[05]; tmp = x[15] ^ x[00]; x[15] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[15] ^ x[00], 16);
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x[01] += x[06]; tmp = x[12] ^ x[01]; x[12] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[12] ^ x[01], 16);
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x[02] += x[07]; tmp = x[13] ^ x[02]; x[13] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[13] ^ x[02], 16);
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x[03] += x[04]; tmp = x[14] ^ x[03]; x[14] = (tmp << 16) | (tmp >> -16); // Integers.RotateLeft(x[14] ^ x[03], 16);
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x[10] += x[15]; tmp = x[05] ^ x[10]; x[05] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[05] ^ x[10], 12);
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x[11] += x[12]; tmp = x[06] ^ x[11]; x[06] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[06] ^ x[11], 12);
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x[08] += x[13]; tmp = x[07] ^ x[08]; x[07] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[07] ^ x[08], 12);
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x[09] += x[14]; tmp = x[04] ^ x[09]; x[04] = (tmp << 12) | (tmp >> -12); // Integers.RotateLeft(x[04] ^ x[09], 12);
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x[00] += x[05]; tmp = x[15] ^ x[00]; x[15] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[15] ^ x[00], 8);
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x[01] += x[06]; tmp = x[12] ^ x[01]; x[12] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[12] ^ x[01], 8);
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x[02] += x[07]; tmp = x[13] ^ x[02]; x[13] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[13] ^ x[02], 8);
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x[03] += x[04]; tmp = x[14] ^ x[03]; x[14] = (tmp << 8) | (tmp >> -8); // Integers.RotateLeft(x[14] ^ x[03], 8);
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x[10] += x[15]; tmp = x[05] ^ x[10]; x[05] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[05] ^ x[10], 7);
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x[11] += x[12]; tmp = x[06] ^ x[11]; x[06] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[06] ^ x[11], 7);
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x[08] += x[13]; tmp = x[07] ^ x[08]; x[07] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[07] ^ x[08], 7);
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x[09] += x[14]; tmp = x[04] ^ x[09]; x[04] = (tmp << 7) | (tmp >> -7); // Integers.RotateLeft(x[04] ^ x[09], 7);
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}
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for (int i = 0; i < 16; i++)
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{
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uint n = x[i] + input[i];
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output[(i * 4)] = (byte)n;
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output[(i * 4) + 1] = (byte)(n >> 8);
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output[(i * 4) + 2] = (byte)(n >> 16);
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output[(i * 4) + 3] = (byte)(n >> 24);
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}
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static unsafe void ImplProcessBlock(ReadOnlySpan<byte> input, Span<byte> output, byte[] keyStream)
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{
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fixed (byte* pinput = input)
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fixed (byte* poutput = output)
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fixed (byte* pkeyStream = keyStream)
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{
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ulong* pulinput = (ulong*)pinput;
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ulong* puloutput = (ulong*)poutput;
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ulong* pulkeyStream = (ulong*)pkeyStream;
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puloutput[0] = pulkeyStream[0] ^ pulinput[0];
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puloutput[1] = pulkeyStream[1] ^ pulinput[1];
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puloutput[2] = pulkeyStream[2] ^ pulinput[2];
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puloutput[3] = pulkeyStream[3] ^ pulinput[3];
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puloutput[4] = pulkeyStream[4] ^ pulinput[4];
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puloutput[5] = pulkeyStream[5] ^ pulinput[5];
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puloutput[6] = pulkeyStream[6] ^ pulinput[6];
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puloutput[7] = pulkeyStream[7] ^ pulinput[7];
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}
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}
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#endif
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}
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}
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#endif
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