i dont know what this is

unzip.py

#!/usr/bin/env python

# WTFPL

import base64 as b64
import sys,zipfile,os.path
from Crypto.Cipher import AES

if __name__ == "__main__":
    basename = os.path.basename(sys.argv[1])
    sstr = basename.split(".")[0]
    secret = b64.b32decode(sstr+ "=" * ((8 - len(sstr) % 8) % 8))
    #print(secret[5:-5])
    obj = AES.new(b'\x8b\xa7\x36\x0a\xd5\x61\xb5\x9a\x58\x90\x58\x90\x2c\xc6\x44\x62', AES.MODE_CBC, b'\x0a\x01\x0b\x05\x04\x0f\x07\x09\x17\x03\x01\x06\x08\x0c\x0d\x5b')
    plain = obj.decrypt(b64.b64decode(secret[5:-5]))
    zipf = zipfile.PyZipFile(sys.argv[1],"r")
    fn = zipf.infolist()[0].filename.split(".")[0].encode()
    password = plain.split(fn)[1].split(b"\r")[0]
    if len(sys.argv)>2:
        tar = sys.argv[2]
    else:
        tar = "."
    zipf.extract(zipf.infolist()[0],tar,password)