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(KiriKiri): another encryption scheme.

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This commit is contained in:
morkt 2017-09-12 17:35:11 +04:00
parent 481b0995a7
commit cb2b6e2f43
1 changed files with 26 additions and 1 deletions
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27
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -744,7 +744,7 @@ namespace GameRes.Formats.KiriKiri
Decrypt (entry, offset, buffer, pos, count);
}
IEnumerable<byte> GetKey (uint hash)
internal IEnumerable<byte> GetKey (uint hash)
{
hash = (hash ^ m_seed) & 0x7FFFFFFF;
hash = hash << 31 | hash;
@ -1142,4 +1142,29 @@ namespace GameRes.Formats.KiriKiri
[NonSerialized]
Dictionary<uint, string> KnownNames = null;
}
[Serializable]
public class MadoCrypt : AkabeiCrypt
{
public MadoCrypt (uint seed) : base (seed)
{
}
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
{
int key_pos = (int)offset % 0x1F;
var key = GetKey (entry.Hash).ElementAt (key_pos);
return (byte)(value ^ key);
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
var key = GetKey (entry.Hash).ToArray();
int key_pos = (int)offset;
for (int i = 0; i < count; ++i)
{
buffer[pos+i] ^= key[key_pos++ % 0x1F];
}
}
}
}