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Improve AES key expansion performance

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This commit is contained in:
Alex Barney 2019-11-23 20:05:05 -06:00
parent e02e719ea5
commit 3395ebff44
1 changed files with 4 additions and 2 deletions
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6
src/LibHac/Crypto/Detail/AesCoreNi.cs
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@ -22,7 +22,7 @@ namespace LibHac.Crypto.Detail
{ {
Debug.Assert(key.Length == Aes.KeySize128); Debug.Assert(key.Length == Aes.KeySize128);
KeyExpansion(key, MemoryMarshal.CreateSpan(ref _roundKeys, RoundKeyCount), isDecrypting); KeyExpansion(key, isDecrypting);
} }
public readonly ReadOnlySpan<Vector128<byte>> RoundKeys => public readonly ReadOnlySpan<Vector128<byte>> RoundKeys =>
@ -447,8 +447,10 @@ namespace LibHac.Crypto.Detail
out7 = AesNi.DecryptLast(b7, key); out7 = AesNi.DecryptLast(b7, key);
} }
private static void KeyExpansion(ReadOnlySpan<byte> key, Span<Vector128<byte>> roundKeys, bool isDecrypting) private void KeyExpansion(ReadOnlySpan<byte> key, bool isDecrypting)
{ {
Span<Vector128<byte>> roundKeys = MemoryMarshal.CreateSpan(ref _roundKeys, RoundKeyCount);
var curKey = Unsafe.ReadUnaligned<Vector128<byte>>(ref MemoryMarshal.GetReference(key)); var curKey = Unsafe.ReadUnaligned<Vector128<byte>>(ref MemoryMarshal.GetReference(key));
roundKeys[0] = curKey; roundKeys[0] = curKey;