#!/usr/bin/env python
#-*- coding: utf8 -*-
import re
import requests
from Crypto.Cipher import AES
URL = 'http://www.lineage2dex.com/captcha.php'
TO_NUMBERS_RE = re.compile('toNumbers\("([0-9, a-f]+)"\)')
def to_numbers(hex_string):
    return hex_string.decode('hex')
def main():
    r = requests.get(URL)
    key, iv, ciphered = map(to_numbers, TO_NUMBERS_RE.findall(r.text))
    aes = AES.new(key, mode=AES.MODE_CBC, IV=iv)
    magic = aes.decrypt(ciphered).encode('hex')
    r = requests.get(URL, cookies={'__HFUID': magic})
    if r.headers['content-type'] != 'image/png':
        print '[-] Bad response!'
        return 1
    with open('captha.png', 'wb') as fd:
        fd.write(r.content)
    return 0
main()