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Use AES-NI instruction set if possible

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This commit is contained in:
BruceChen 2022-08-28 10:50:52 +08:00
parent 13d1a9856a
commit 842c968220
2 changed files with 115 additions and 5 deletions
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23
MinecraftClient/Crypto/Streams/AesCfb8Stream.cs
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@ -6,6 +6,7 @@ using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;
using System.Collections.Concurrent;
using System.Runtime.CompilerServices;
namespace MinecraftClient.Crypto.Streams
{
@ -13,7 +14,9 @@ namespace MinecraftClient.Crypto.Streams
{
public static readonly int blockSize = 16;
private Aes aes;
private readonly Aes? Aes = null;
private readonly AesContext? FastAes = null;
public System.IO.Stream BaseStream { get; set; }
@ -26,7 +29,10 @@ namespace MinecraftClient.Crypto.Streams
{
BaseStream = stream;
aes = GenerateAES(key);
if (System.Runtime.Intrinsics.X86.Sse2.IsSupported && System.Runtime.Intrinsics.X86.Aes.IsSupported)
FastAes = new AesContext(key);
else
Aes = GenerateAES(key);
Array.Copy(key, ReadStreamIV, 16);
Array.Copy(key, WriteStreamIV, 16);
@ -76,6 +82,7 @@ namespace MinecraftClient.Crypto.Streams
return temp[0];
}
[MethodImpl(MethodImplOptions.AggressiveOptimization)]
public override int Read(byte[] buffer, int outOffset, int required)
{
if (this.inStreamEnded)
@ -93,7 +100,7 @@ namespace MinecraftClient.Crypto.Streams
return readed;
}
OrderablePartitioner<Tuple<int, int>> rangePartitioner = (curRead <= 256) ?
OrderablePartitioner<Tuple<int, int>> rangePartitioner = (curRead <= 256) ?
Partitioner.Create(readed, readed + curRead, 32) : Partitioner.Create(readed, readed + curRead);
Parallel.ForEach(rangePartitioner, (range, loopState) =>
{
@ -101,7 +108,10 @@ namespace MinecraftClient.Crypto.Streams
for (int idx = range.Item1; idx < range.Item2; idx++)
{
ReadOnlySpan<byte> blockInput = new(inputBuf, idx, blockSize);
aes.EncryptEcb(blockInput, blockOutput, PaddingMode.None);
if (FastAes != null)
FastAes.EncryptEcb(blockInput, blockOutput);
else
Aes!.EncryptEcb(blockInput, blockOutput, PaddingMode.None);
buffer[outOffset + idx] = (byte)(blockOutput[0] ^ inputBuf[idx + blockSize]);
}
});
@ -136,7 +146,10 @@ namespace MinecraftClient.Crypto.Streams
for (int wirtten = 0; wirtten < required; ++wirtten)
{
ReadOnlySpan<byte> blockInput = new(outputBuf, wirtten, blockSize);
aes.EncryptEcb(blockInput, blockOutput, PaddingMode.None);
if (FastAes != null)
FastAes.EncryptEcb(blockInput, blockOutput);
else
Aes!.EncryptEcb(blockInput, blockOutput, PaddingMode.None);
outputBuf[blockSize + wirtten] = (byte)(blockOutput[0] ^ input[offset + wirtten]);
}
BaseStream.WriteAsync(outputBuf, blockSize, required);