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New to lua, can I do XOR?

 
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dankedgelord
How do I cheat?
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Joined: 21 Mar 2017
Posts: 2

PostPosted: Sun Apr 09, 2017 9:55 am    Post subject: New to lua, can I do XOR? Reply with quote

Hi, is it possible to do something like this in cheat engine lua scripting?

1. Go to a specific address
2. XOR the first 4 bytes, and the next 4 bytes.
3. If it returns something like 8F000000 for example, I want to take the first byte 8F, convert it to decimal and add 1 to it and return this value as an integer.

Thanks in advance if you have an answer for this.
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FreeER
Master Cheater
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Joined: 09 Aug 2013
Posts: 327

PostPosted: Sun Apr 09, 2017 11:02 am    Post subject: Reply with quote

The main.lua (and wiki) shows that these exist in lua:
Code:
bOr(int1, int2)   : Binary Or
bXor(int1, int2)  : Binary Xor
bAnd(int1, int2)  : Binary And
bShl(int, int2)   : Binary shift left
bShr(int, int2)   : Binary shift right
bNot(int)         : Binary not


So I think something like this should work:

Code:
addr = "address of information"
val = readInteger(addr)
val2 = readInteger(addr.."+4") -- assuming a string address
xored = bXor(val, val2)
if xored == 0x8F000000 then
  return 0x90
  --[[
   8F+1, lua knows it's a number so unless it needs to be a string it doesn't matter
   if you use decimal 144 or hexadecimal 0x90 notation to write it.

   if you did need it as a string then tostring(0x90) is all you need
   though since you know the value you can do it with just return "144"
   
   for a hex string string.format("%#X", 0x9a) would work
   note that I used 9a to demonstrate the formatting better
   the # adds 0x to the string, and the case of the X determines
   the case of the letters in the hex value (x = a, X = A)
  --]]
end


Though you can probably forgo the variables and use:

Code:
if bXor(readInteger("addr"), readInteger("addr+4")) == 0x8F000000 then
  return 144
end


If you don't know what the result will be and just want to return the result plus 1 then:
Code:
return bShr(bXor(readInteger("addr"), readInteger("addr+4")),24)+1
or
Code:
return tostring(bShr(bXor(readInteger("addr"), readInteger("addr+4")),24)+1)
if you want/need it as a string
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ParkourPenguin
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PostPosted: Sun Apr 09, 2017 11:05 am    Post subject: Reply with quote

Code:
function xor_cmp(address, value)
  address = getAddress(address)
  return readInteger(address) ~ readInteger(address+4) == value and (value >> 24) + 1 or nil
end

-- usage:
xor_cmp(0x038F192C, 0x8f000000)

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dankedgelord
How do I cheat?
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Joined: 21 Mar 2017
Posts: 2

PostPosted: Sun Apr 09, 2017 12:08 pm    Post subject: Reply with quote

Thank you for the replies Smile
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