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(KiriKiri): parametrized SmxCrypt.

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This commit is contained in:
morkt 2018-11-07 11:53:49 +04:00
parent f787e608c9
commit f5c39003a1
1 changed files with 24 additions and 8 deletions
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32
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -1247,20 +1247,30 @@ namespace GameRes.Formats.KiriKiri
[Serializable]
public class SmxCrypt : ICrypt
{
byte[] KeySeq;
public SmxCrypt (params byte[] key_seq)
{
if (key_seq.Length < 7)
throw new ArgumentException ("Not enough arguments for SmxCrypt.");
KeySeq = key_seq;
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
var key = new byte[6] {
(byte)(entry.Hash >> 5),
(byte)(entry.Hash >> 4),
(byte)(entry.Hash >> 3),
(byte)(entry.Hash >> 2),
(byte)(entry.Hash >> 2),
(byte)(entry.Hash >> 3),
byte start_key = (byte)(entry.Hash >> KeySeq[0]);
var key = new byte[] {
(byte)(entry.Hash >> KeySeq[1]),
(byte)(entry.Hash >> KeySeq[2]),
(byte)(entry.Hash >> KeySeq[3]),
(byte)(entry.Hash >> KeySeq[4]),
(byte)(entry.Hash >> KeySeq[5]),
(byte)(entry.Hash >> KeySeq[6]),
};
for (int i = 0; i < count; ++i)
{
if ((offset + i) <= 100)
buffer[pos+i] ^= key[3];
buffer[pos+i] ^= start_key;
else
buffer[pos+i] ^= key[(int)(offset + i) & 5];
}
@ -1270,6 +1280,12 @@ namespace GameRes.Formats.KiriKiri
{
Decrypt (entry, offset, buffer, pos, count);
}
public override string ToString ()
{
var key_seq = KeySeq != null ? string.Join (",", KeySeq.Select (x => x.ToString ("D"))) : "null";
return string.Format ("{0}({1})", base.ToString(), key_seq);
}
}
[Serializable]