AESCipher.py

import base64

from Crypto import Random
from Crypto.Cipher import AES

BS = 16
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[0:-ord(s[-1])]

class AESCipher:
    def __init__( self, key ):
        self.key = pad(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 ):
        try:
            enc = base64.b64decode(enc)
            iv = enc[:16]
            cipher = AES.new(self.key, AES.MODE_CBC, iv )
            unpadded = unpad(cipher.decrypt( enc[16:] ))
            test_UTF_8 = unpadded.decode('utf-8')
            return unpadded
        except:
            return ""

    def __del__( self ):
        del self.key