gistfile1.txt

#!/usr/bin/python

import struct
import socket
import time
import nacl.secret
import nacl.utils
from nacl.encoding import HexEncoder
import sys

KEY = '1de37598478f6f9a62c3d19fa8e1b99ea35b6f0e9de0ede83cce6226fe51cd86'

def gen_key():
    return nacl.utils.random(nacl.secret.SecretBox.KEY_SIZE)

def gen_token(ip_addr):
    data = struct.pack('!L', int(time.time())) + socket.inet_aton(ip_addr)

    box = nacl.secret.SecretBox(KEY, HexEncoder)
    message = b""
    nonce = nacl.utils.random(nacl.secret.SecretBox.NONCE_SIZE)
    encrypted = box.encrypt(data, nonce)

    return encrypted.encode('base64').replace('\n', '')


def decrypt_token(token):
    box = nacl.secret.SecretBox(KEY, HexEncoder)
    plain = box.decrypt(token.decode('base64'))
    time_d, = struct.unpack('!L', plain[0:4])
    return time_d, socket.inet_ntoa(plain[4:])

#print gen_token('192.168.1.55')

print gen_key().encode('hex')

test = gen_token(sys.argv[1])
print test

print decrypt_token(test)