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(Kirikiri): Add Syangrila Smart encryption

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Crsky 2023-03-04 12:08:47 +08:00
parent 845e99f433
commit 00490899e3
1 changed files with 42 additions and 0 deletions
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42
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -1513,4 +1513,46 @@ namespace GameRes.Formats.KiriKiri
}
}
}
[Serializable]
public class SyangrilaSmartCrypt : ICrypt
{
byte[] GetKey (uint hash)
{
return new byte[5]
{
(byte)(hash >> 5),
(byte)(hash >> 5),
(byte)(hash >> 7),
(byte)(hash >> 1),
(byte)(hash >> 4),
};
}
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
{
var key = GetKey (entry.Hash);
if (offset <= 0x64)
return (byte)(value ^ key[4]);
else
return (byte)(value ^ key[offset & 3]);
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
var key = GetKey (entry.Hash);
for (var i = 0; i < count; i++)
{
if (offset+i <= 0x64)
buffer[pos+i] ^= key[4];
else
buffer[pos+i] ^= key[(offset+i) & 3];
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
Decrypt (entry, offset, buffer, pos, count);
}
}
}