CJ_2022_Reverse_Kamu_Nanya.py

from subprocess import Popen, PIPE

for x in range(599):
    a = Popen(["objdump", "-d", f"bertanya{x}"], stdout=PIPE)
    stdout = a.communicate()[0].splitlines()
    n = stdout[16].decode().split(" ")
    logic = n[-5]
    num2 = n[-1].split(",")[0][1:]
    num = stdout[17].decode().split(" ")[-1].split(",")[0][1:]

    n = ""
    if "add" in logic:
        n = int(num, 16)-int(num2, 16)
    elif "sub" in logic:
        n = int(num, 16)+int(num2, 16)
        if n>256:
            n-=256
    elif "xor" in logic:
        n = int(num, 16)^int(num2, 16)
    else:
        print(logic, f"bertanya{x}")
        exit()
    print(chr(n),end="")