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Optimizations.

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This commit is contained in:
Razmoth
2023-01-07 21:52:15 +04:00
parent 00fb0a8fb4
commit feb6f370c0
3 changed files with 116 additions and 9 deletions
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4
AssetStudio/Crypto/BlkUtils.cs
View File

@@ -46,11 +46,11 @@ namespace AssetStudio
var keyHigh = BinaryPrimitives.ReadUInt64LittleEndian(key.AsSpan(8, 8));
var seed = keyLow ^ keyHigh ^ keySeed ^ blk.InitSeed;
MT19937_64.Init(seed);
var mt64 = new MT19937_64(seed);
var xorpad = new byte[KeySize];
for (int i = 0; i < KeySize; i += 8)
{
BinaryPrimitives.WriteUInt64LittleEndian(xorpad.AsSpan(i, 8), MT19937_64.Int64());
BinaryPrimitives.WriteUInt64LittleEndian(xorpad.AsSpan(i, 8), mt64.Int64());
}
return new CryptoStream(reader.BaseStream, xorpad);

19
AssetStudio/Crypto/MT19937_64.cs
View File

@@ -1,6 +1,6 @@
namespace AssetStudio
{
public static class MT19937_64
public class MT19937_64
{
private const ulong N = 312;
private const ulong M = 156;
@@ -8,10 +8,15 @@
private const ulong UPPER_MASK = 0xFFFFFFFF80000000;
private const ulong LOWER_MASK = 0X7FFFFFFFUL;
private static readonly ulong[] mt = new ulong[N + 1];
private static ulong mti = N + 1;
private readonly ulong[] mt = new ulong[N + 1];
private ulong mti = N + 1;
public static void Init(ulong seed)
public MT19937_64(ulong seed)
{
Init(seed);
}
public void Init(ulong seed)
{
mt[0] = seed;
for (mti = 1; mti < N; mti++)
@@ -20,7 +25,7 @@
}
}
public static ulong Int64()
public ulong Int64()
{
ulong x;
ulong[] mag01 = new ulong[2] { 0x0UL, MATRIX_A };
@@ -56,12 +61,12 @@
return x;
}
public static long Int63()
public long Int63()
{
return (long)(Int64() >> 1);
}
public static ulong IntN(ulong value)
public ulong IntN(ulong value)
{
return (ulong)Int63() % value;
}