Re: obfuscating / protecting LUA code

["Andy Stark" <astark@...>]

Lua list <lua@bazar2.conectiva.com.br> on  at   wrote:
>You could reorder the VM instructions in lopcodes.h, but then you need
>to fix lopcodes.c.

The lopcodes.h and lopcodes.c source files are quite short and have a
fairly simple structure. Perhaps a future distribution of Lua could
include a Lua script that generates these two files and has an option to
permute the order of opcodes using a seed specified by the user. For
simplicity you could use

	(standardOpcodeNumber * primeNumber) % numberOfOpcodes

but some kind of seeded pseudo-random ordering would be more secure.

Having the opcode information in a Lua table in the script might be useful
for other purposes too, for documentation or writing disassemblers, etc.

&.

PS - standard pre-generated versions of lopcodes.h and lopcodes.c should
still be supplied with Lua - the script should just be an extra tool for
those who need it.


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