How to decrypt and decompile luac-file from cocos2d-x framework?

Asked Apr 22 '18 at 09:45

Active Apr 23 '18 at 14:46

Viewed 3,292 times

I know that the lua version is stored in the 5th byte of the luac file (the header). Here's the first few bytes of a luac file I have:

6D 6D 64 64 74 32

The 5th byte is 74. Is My Luac file LuaJIT bytecode?

I am trying to decompile this file and receive this error by using unluac

Exception in thread "main" java.lang.IllegalStateException: The input file does not have the signature of a valid Lua file.
at unluac.parse.BHeader.<init>(BHeader.java:41)
at unluac.Main.file_to_function(Main.java:71)
at unluac.Main.main(Main.java:42)

and below is error by using luadec (lua 5.1)

'=' expected near '?'

How can I decompile this file type?

edited Apr 23 '18 at 14:46

Egor Skriptunoff

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asked Apr 22 '18 at 09:45

Nam Vu

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This file seems to be encrypted. Probably, it was designed for some host application containing modified Lua which is capable of decrypting a file when loading. – Egor Skriptunoff Apr 22 '18 at 10:41
@EgorSkriptunoff what should I do now? – Nam Vu Apr 23 '18 at 02:26
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I'm afraid you can do nothing. You could analyze host executable to learn the encoding algo, but that's not simple... – Egor Skriptunoff Apr 23 '18 at 08:50
@EgorSkriptunoff this file come from cocos2d-x framework, any possible idea? – Nam Vu Apr 23 '18 at 14:06

How to decrypt and decompile luac-file from cocos2d-x framework?

0 Answers0