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(SmxCrypt): introduced Mask parameter.
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@ -1235,32 +1235,31 @@ namespace GameRes.Formats.KiriKiri
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[Serializable]
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public class SmxCrypt : ICrypt
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{
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byte[] KeySeq;
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readonly int Mask;
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readonly byte[] KeySeq;
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public SmxCrypt (params byte[] key_seq)
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public SmxCrypt (int mask, byte[] key_seq)
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{
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if (key_seq.Length < 7)
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if (key_seq.Length <= mask+1)
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throw new ArgumentException ("Not enough arguments for SmxCrypt.");
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KeySeq = key_seq;
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Mask = mask;
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}
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public SmxCrypt (params byte[] key_seq) : this (5, key_seq)
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{
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}
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public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
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{
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byte start_key = (byte)(entry.Hash >> KeySeq[0]);
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var key = new byte[] {
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(byte)(entry.Hash >> KeySeq[1]),
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(byte)(entry.Hash >> KeySeq[2]),
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(byte)(entry.Hash >> KeySeq[3]),
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(byte)(entry.Hash >> KeySeq[4]),
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(byte)(entry.Hash >> KeySeq[5]),
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(byte)(entry.Hash >> KeySeq[6]),
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};
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var key = GenerateKey (entry.Hash);
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for (int i = 0; i < count; ++i)
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{
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if ((offset + i) <= 100)
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buffer[pos+i] ^= start_key;
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else
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buffer[pos+i] ^= key[(int)(offset + i) & 5];
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buffer[pos+i] ^= key[(int)(offset + i) & Mask];
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}
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}
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@ -1274,6 +1273,14 @@ namespace GameRes.Formats.KiriKiri
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var key_seq = KeySeq != null ? string.Join (",", KeySeq.Select (x => x.ToString ("D"))) : "null";
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return string.Format ("{0}({1})", base.ToString(), key_seq);
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}
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protected byte[] GenerateKey (uint hash)
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{
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var key = new byte[KeySeq.Length - 1];
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for (int i = 1; i < KeySeq.Length; ++i)
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key[i - 1] = (byte)(hash >> KeySeq[i]);
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return key;
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}
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}
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[Serializable]
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