I'm trying to write a keygen to a crack me that I'm learning from and I got stuck. What happens there is pretty simple:
Let's say that I entered the password: "12121212"
XOR DWORD PTR DS:[ECX+EAX],1234567 AND BYTE PTR DS:[ECX+EAX],0E ADD ECX,4 CMP ECX,8
As we can see, the first
DWORD of the password (
0x32313231, notice that x86 processors use little-endian layout) is being
0x32313231 ^ 0x1234567 results with
Then there is an
AND operation on the first byte (
0x56) of the manipulated password and
0xe which results with
0x6. After that, the program repeats the operations, this time on the second
DWORD of the password.
My question is: I know I can reverse
XOR but is it possible with