#!/usr/bin/env python3
import sys

oldexcepthook = sys.excepthook
def newexcepthook(type,value,traceback):
	oldexcepthook(type,value,traceback)
	#input("Press ENTER to quit.")
sys.excepthook = newexcepthook

import os
p = os.path.join
pUp = os.path.dirname
s = False
if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
	s = os.path.realpath(sys.executable)
else:
	s = os.path.realpath(__file__)
sp = pUp(s)

# script start
try:
	from Cryptodome.Cipher import AES
except:
	from Crypto.Cipher import AES
bufferSize = int(os.environ["fstream_aesbuffer"])
unbufferedStdout = os.fdopen(sys.stdout.fileno(),"wb",0) # Make unbuffered stdout

pw = os.environ["fstream_aespass"].encode("utf-8")
while len(pw) < 32: pw = pw + pw
pw = pw[:32]

while True:
	iv = sys.stdin.buffer.read(AES.block_size)
	if len(iv) != AES.block_size: sys.exit(0)
	data = sys.stdin.buffer.read(bufferSize)
	if len(data) != bufferSize: sys.exit(0)
	cipher = AES.new(pw, AES.MODE_CBC, iv = iv)
	unbufferedStdout.write(cipher.decrypt(data))