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(ChocolatCrypt): new KiriKiri encryption.

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reworked ChainReactionCrypt base class.
This commit is contained in:
morkt 2018-01-30 16:38:36 +04:00
parent 978da7fe92
commit f0ec7b3682
1 changed files with 33 additions and 13 deletions
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46
ArcFormats/KiriKiri/ChainReactionCrypt.cs
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@ -2,7 +2,7 @@
//! \date Mon Mar 07 15:59:47 2016 //! \date Mon Mar 07 15:59:47 2016
//! \brief KiriKiri XP3 ecryption filter used in some games. //! \brief KiriKiri XP3 ecryption filter used in some games.
// //
// Copyright (C) 2016 by morkt // Copyright (C) 2016-2018 by morkt
// //
// Permission is hereby granted, free of charge, to any person obtaining a copy // Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to // of this software and associated documentation files (the "Software"), to
@ -60,10 +60,14 @@ namespace GameRes.Formats.KiriKiri
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count) public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{ {
uint limit = GetEncryptionLimit (entry); uint limit = GetEncryptionLimit (entry);
if (offset >= limit)
return;
count = Math.Min ((int)(limit - offset), count);
uint key = entry.Hash; uint key = entry.Hash;
for (int i = 0; i < count && offset < limit; ++i, ++offset) int ofs = (int)offset;
for (int i = 0; i < count; ++i)
{ {
values[pos+i] ^= (byte)(offset ^ (key >> (((int)offset & 3) << 3))); values[pos+i] ^= (byte)((ofs+i) ^ (byte)(key >> (((ofs+i) & 3) << 3)));
} }
} }
@ -75,7 +79,7 @@ namespace GameRes.Formats.KiriKiri
// Decrypt (entry, offset, values, pos, count); // Decrypt (entry, offset, values, pos, count);
} }
internal uint GetEncryptionLimit (Xp3Entry entry) protected virtual uint GetEncryptionLimit (Xp3Entry entry)
{ {
uint limit; uint limit;
if (EncryptionThresholdMap != null && EncryptionThresholdMap.TryGetValue (entry.Hash, out limit)) if (EncryptionThresholdMap != null && EncryptionThresholdMap.TryGetValue (entry.Hash, out limit))
@ -234,20 +238,36 @@ namespace GameRes.Formats.KiriKiri
StartupTjsNotEncrypted = true; StartupTjsNotEncrypted = true;
} }
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count) protected override uint GetEncryptionLimit (Xp3Entry entry)
{ {
uint limit = GetEncryptionLimit (entry); uint limit = base.GetEncryptionLimit (entry);
switch (limit) switch (limit)
{ {
case 0: return; case 0: return 0;
case 1: limit = 0x100; break; case 1: return 0x100;
case 2: limit = 0x200; break; case 2: return 0x200;
case 3: limit = entry.Size; break; case 3: return entry.Size;
default: return limit;
} }
uint key = entry.Hash; }
for (int i = 0; i < count && offset < limit; ++i, ++offset) }
[Serializable]
public class ChocolatCrypt : ChainReactionCrypt
{
public ChocolatCrypt () : base ("plugins/list.txt")
{
StartupTjsNotEncrypted = true;
}
protected override uint GetEncryptionLimit (Xp3Entry entry)
{
uint limit = base.GetEncryptionLimit (entry);
switch (limit)
{ {
values[pos+i] ^= (byte)(offset ^ (key >> (((int)offset & 3) << 3))); case 0: return 0;
case 2: return entry.Size;
default: return 0x100;
} }
} }
} }