RSA-decipher-oracle

import re
import socket
from telnetlib import Telnet
from Crypto.Util import number

ip,port = 'challenge01.root-me.org',51031
n = 456378902858290907415273676326459758501863587455889046415299414290812776158851091008643992243505529957417209835882169153356466939122622249355759661863573516345589069208441886191855002128064647429111920432377907516007825359999
e = 65537
c = 41662410494900335978865720133929900027297481493143223026704112339997247425350599249812554512606167456298217619549359408254657263874918458518753744624966096201608819511858664268685529336163181156329400702800322067190861310616
rx_flag = re.compile(b'The corresponding plaintext is: (.*)\n')
class Hacker:
	def __init__(self):
		self.target = (ip,port)

	def reconnect(self):
		self.s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
		self.s.connect(self.target)
		self.t = Telnet()
		self.t.sock=self.s

	def close_connection(self):
		self.s.close()

	def banner(self):
		resp = self.t.read_until(b'to decrypt?');print(resp)

	def recon(self):
		self.t.interact()

	def attack(self):
		self.banner()
		self.t.write(f"{c*pow(2,e,n)}\n".encode())
		resp = self.t.read_until(b'\n\n');print(resp)
		plaintint = int(rx_flag.search(resp).group(1))
		inv_2 = number.inverse(2,n)
		plaintint = (plaintint*inv_2)%n
		print(plaintint.to_bytes((plaintint.bit_length()+7)//8,'big'))
		self.banner()

## Well done! The flag is S1d3Ch4nn3l4tt4ck
if __name__=='__main__':
	hacker = Hacker()
	hacker.reconnect()
	# hacker.recon()
	hacker.attack()
	hacker.close_connection()