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(ChainReactionCrypt): added more variations.

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This commit is contained in:
morkt 2018-07-06 15:17:14 +04:00
parent 46eeab8114
commit c64b68b1f5
1 changed files with 76 additions and 3 deletions
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79
ArcFormats/KiriKiri/ChainReactionCrypt.cs
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@ -93,10 +93,15 @@ namespace GameRes.Formats.KiriKiri
public override void Init (ArcFile arc)
{
var bin = ReadListBin (arc);
var bin = ReadListBin (arc, m_list_bin);
if (null == bin || bin.Length <= 0x30)
return;
Init (bin);
}
internal void Init (byte[] bin)
{
if (!Binary.AsciiEqual (bin, "\"\x0D\x0A"))
{
for (int i = 0; i < 3; ++i)
@ -114,9 +119,9 @@ namespace GameRes.Formats.KiriKiri
ParseListBin (bin);
}
internal byte[] ReadListBin (ArcFile arc)
internal byte[] ReadListBin (ArcFile arc, string list_name)
{
var list_bin = arc.Dir.FirstOrDefault (e => e.Name == m_list_bin) as Xp3Entry;
var list_bin = arc.Dir.FirstOrDefault (e => e.Name == list_name) as Xp3Entry;
if (null == list_bin)
return null;
var bin = new byte[list_bin.UnpackedSize];
@ -271,4 +276,72 @@ namespace GameRes.Formats.KiriKiri
}
}
}
[Serializable]
public class XanaduCrypt : ChainReactionCrypt
{
public XanaduCrypt () : base ("plugins/list.txt")
{
StartupTjsNotEncrypted = true;
}
public override void Init (ArcFile arc)
{
var bin = ReadListBin (arc, "list2.txt");
if (null == bin)
bin = ReadListBin (arc, "plugins/list.txt");
if (null == bin)
return;
Init (bin);
}
protected override uint GetEncryptionLimit (Xp3Entry entry)
{
uint limit = base.GetEncryptionLimit (entry);
switch (limit)
{
case 0: return 0;
case 2: return entry.UnpackedSize;
default: return 0x100;
}
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
uint limit = GetEncryptionLimit (entry);
if (offset >= limit)
return;
count = Math.Min ((int)(limit - offset), count);
uint key = entry.Hash ^ ~0x03020100u;
int ofs = (int)offset;
byte extra = (byte)(((ofs & 0xFF) >> 2) << 2);
for (int i = 0; i < count; ++i)
{
if (((ofs + i) & 0xFF) == 0)
extra = 0;
else if (((ofs + i) & 3) == 0)
extra += 4;
values[pos+i] ^= (byte)((key >> (((ofs+i) & 3) << 3)) ^ extra);
}
}
}
[Serializable]
public class SisMikoCrypt : XanaduCrypt
{
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
uint limit = GetEncryptionLimit (entry);
if (offset >= limit)
return;
count = Math.Min ((int)(limit - offset), count);
uint key = ~Binary.RotR (entry.Hash, 16);
int ofs = (int)offset;
for (int i = 0; i < count; ++i)
{
values[pos+i] ^= (byte)(key >> (((ofs+i) & 3) << 3));
}
}
}
}