Cheat Engine

[etioplmld]

A game is encrypted but can be decrypted with a custom value type,When need to change a lot of Continuous addresses,
adding them all to one table and set to custom value type. and use this.

[cooleko]

Build the custom type in lua and do it all from there?

https://wiki.cheatengine.org/index.php?title=Lua:registerCustomTypeLua

[ParkourPenguin]

See the CustomType class in celua.txt. In particular, the global function `getCustomType` and the methods `byteTableToValue` and `valueToByteTable`. With that, you can get a byte table with `readBytes(address, true)` and run it through a custom type handler (and vise versa w/ `writeBytes`).

Note that the `valueToByteTable` function uses uninitialized memory for the output buffer, so a `ConvertBackRoutine` implementation that reads from the output buffer may produce unpredictable results. I don't know any easy way of solving this.

[Dark Byte]

the addresslist is the easiest way,
but you could access custom types yourself and pass them bytearrays to get the converted value and then use writeBytes to write it

https://github.com/cheat-engine/cheat-engine/blob/master/Cheat%20Engine/bin/celua.txt#L3322

[etioplmld]

It looks more complicated than repeating the encryption

about Convert assembly instructions ' xor , rol ,ror , 'to lua


Is this correct?

xor = bXor

rol num n = num * 2^n ,Rotate left is equal to multiplying by 2 to the nth power ,

ror num n = num / 2^n

someone calculate rol a number in lua ,like rol eax 14 ,he use multiply 16384(2^14=16384).

[Dark Byte]

xor is value ~ x

rol and ror are a bit more tricky, as lua only has shl (value << x) and shr(value >> x), and ror/rol are also more dependand on bitsize of the value operated on

[etioplmld]

a related script found on other sites