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(SmxCrypt): introduced Mask parameter.

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This commit is contained in:
morkt 2018-12-19 03:33:03 +04:00
parent 0c4dc5a679
commit 85c0358ca0
1 changed files with 19 additions and 12 deletions
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31
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -1235,32 +1235,31 @@ namespace GameRes.Formats.KiriKiri
[Serializable]
public class SmxCrypt : ICrypt
{
byte[] KeySeq;
readonly int Mask;
readonly byte[] KeySeq;
public SmxCrypt (params byte[] key_seq)
public SmxCrypt (int mask, byte[] key_seq)
{
if (key_seq.Length < 7)
if (key_seq.Length <= mask+1)
throw new ArgumentException ("Not enough arguments for SmxCrypt.");
KeySeq = key_seq;
Mask = mask;
}
public SmxCrypt (params byte[] key_seq) : this (5, key_seq)
{
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
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]),
};
var key = GenerateKey (entry.Hash);
for (int i = 0; i < count; ++i)
{
if ((offset + i) <= 100)
buffer[pos+i] ^= start_key;
else
buffer[pos+i] ^= key[(int)(offset + i) & 5];
buffer[pos+i] ^= key[(int)(offset + i) & Mask];
}
}
@ -1274,6 +1273,14 @@ namespace GameRes.Formats.KiriKiri
var key_seq = KeySeq != null ? string.Join (",", KeySeq.Select (x => x.ToString ("D"))) : "null";
return string.Format ("{0}({1})", base.ToString(), key_seq);
}
protected byte[] GenerateKey (uint hash)
{
var key = new byte[KeySeq.Length - 1];
for (int i = 1; i < KeySeq.Length; ++i)
key[i - 1] = (byte)(hash >> KeySeq[i]);
return key;
}
}
[Serializable]