Nightmare of Rebellion License Generator

import ctypes, win32api
import struct, random, time, traceback
import hashlib, zlib, base64, sys

def crc32(data):
    return ctypes.c_ulong(zlib.crc32(data)).value


def sagiri_crypt(data, seed):
    a = 362436069
    b = 521288629
    c = 88675123
    res = ''
    lseed = seed
    for ch in data:
        seed = lseed ^ lseed << 11 & 4294967295L
        lseed = a
        a, b, c = b, c, c ^ seed ^ (seed ^ c >> 11) >> 8
        res += chr((ord(ch) ^ c) & 255)

    return res


def sagiri_hash(s, salt):
    salt1 = ''
    salt2 = ''
    for i in xrange(64):
        if i < len(salt):
            ch = ord(salt[i])
        else:
            ch = 0
        salt1 += chr(ch ^ 54)
        salt2 += chr(ch ^ 92)

    return hashlib.sha1(salt2 + hashlib.sha1(salt1 + s).digest()).hexdigest()


def sagiri_encode(data, key):
    checksum = crc32(data)
    data = sagiri_crypt(data, checksum ^ crc32(key))
    return base64.b64encode(struct.pack('I', checksum) + data)


def get_volume_serial():
    return ctypes.c_ulong(win32api.GetVolumeInformation('\\')[1]).value


def generate_sagiri_licence(status, basename, date, gameid):
    fmt = '=4sI41s41sI41s'
    magic = 'HKS'
    key = gameid
    salt = 'hachikuma'
    basehash = sagiri_hash(basename, "Riatre's Alice Magic")
    hash1 = sagiri_hash('%u:%u:%s:%u' % (status, key, basehash, get_volume_serial()), salt)
    hash2 = sagiri_hash('%u:%u:%s:%u' % (status, key, basehash, date), salt)
    licence = struct.pack(fmt, magic, status, basehash, hash1, date, hash2)
    licence = 'LicenceInfo: ' + sagiri_encode(licence, 'hachikuma')
    return licence


if __name__ == '__main__':
    try:
        gameid = 10040
        if len(sys.argv) > 1:
            gameid = int(sys.argv[1])
        with open('Licence.dat', 'wt') as fp:
            fp.write(generate_sagiri_licence(1, 'Alice Margatroid Saimoe %u' % random.randint(0, 4294967295L), int(time.time()), gameid))
        ctypes.windll.user32.MessageBoxA(None, 'Done/', '', 64)
    except:
        ctypes.windll.user32.MessageBoxA(None, traceback.format_exc(), 'Error', 16)