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(KiriKiri): another encryption algorithm.

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This commit is contained in:
morkt 2020-03-30 17:30:12 +04:00
parent e061687816
commit d90e65c6a6
1 changed files with 38 additions and 0 deletions
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38
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -1368,4 +1368,42 @@ namespace GameRes.Formats.KiriKiri
Decrypt (entry, offset, buffer, pos, count);
}
}
[Serializable]
public class NekoWorksCrypt : ICrypt
{
byte[] DefaultKey;
public NekoWorksCrypt (byte[] key)
{
DefaultKey = key;
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
var key = InitKey (entry.Hash);
for (int i = 0; i < count; ++i)
{
buffer[pos+i] ^= key[(offset + i) % 31];
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
{
Decrypt (entry, offset, buffer, pos, count);
}
byte[] InitKey (uint hash)
{
hash &= 0x7FFFFFFF;
hash = hash << 31 | hash;
var key = DefaultKey.Clone() as byte[];
for (int i = 0; i < 31; ++i)
{
key[i] ^= (byte)hash;
hash = (hash & 0xFFFFFFFE) << 23 | hash >> 8;
}
return key;
}
}
}