Python AES Cipher

crypto.py

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

class AESCipher(object):

    def __init__(self, key):
        self.key = hashlib.sha256(key.encode()).digest()

    def encrypt(self, raw):
        raw = self._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[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8')

    def _pad(self, s):
        return s + (AES.block_size - len(s) % AES.block_size) * chr(AES.block_size - len(s) % AES.block_size)

    @staticmethod
    def _unpad(s):
        return s[:-ord(s[len(s)-1:])]

Example of use

import crypto
c = crypto.AESCipher(key="123456789qwerty$")
print(c.encrypt("FOO"))
print(c.decrypt(c.encrypt("FOO")))

Java counterpart https://gist.github.com/maxpowel/dd78308c83228f3234f216db49224057