crypto.py

# -*- coding: utf-8 -*-

import base64
from Crypto.Cipher import AES
from Crypto import Random

BS = 16
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[:-ord(s[len(s) - 1:])]


class AESCipher:
    def __init__(self, key):
        self.key = key

    def encrypt(self, raw):
        raw = pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.b64encode(iv + cipher.encrypt(raw))

    def decrypt(self, enc):
        enc = base64.b64decode(enc)
        iv = enc[:16]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return unpad(cipher.decrypt(enc[16:]))

if __name__ == "__main__":
    key = "RainID39"
    message = "0c2441ca-885d-488f-bf8b-cc6a423d67771468233499"
    pad_key = pad(key)
    aes = AESCipher(pad_key)
    encrypt_message = aes.encrypt(message)
    print pad_key
    print message
    print encrypt_message
    print aes.decrypt(encrypt_message)