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(KiriKiri): another encryption scheme.

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This commit is contained in:
morkt 2018-11-04 15:47:31 +04:00
parent bb8d3dadb8
commit ad53c679c7
1 changed files with 41 additions and 0 deletions
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41
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -27,6 +27,7 @@ using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using GameRes.Compression;
using GameRes.Utility;
@ -1293,4 +1294,44 @@ namespace GameRes.Formats.KiriKiri
Decrypt (entry, offset, data, pos, count);
}
}
[Serializable]
public class PinPointCrypt : ICrypt
{
public override void Decrypt (Xp3Entry entry, long offset, byte[] data, int pos, int count)
{
for (int i = 0; i < count; ++i)
{
byte val = data[pos+i];
int bit_count = CountSetBits (val);
if (bit_count > 0)
{
val = Binary.RotByteL (val, bit_count);
data[pos+i] = val;
}
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] data, int pos, int count)
{
for (int i = 0; i < count; ++i)
{
byte val = data[pos+i];
int bit_count = CountSetBits (val);
if (bit_count > 0)
{
val = Binary.RotByteR (val, bit_count);
data[pos+i] = val;
}
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
static int CountSetBits (byte x)
{
int bit_count = (x & 0x55) + ((x >> 1) & 0x55);
bit_count = (bit_count & 0x33) + ((bit_count >> 2) & 0x33);
return ((bit_count & 0xF) + ((bit_count >> 4) & 0xF)) & 0xF;
}
}
}