AES is available out of the box, see example usage below. Though I would be interested to compare to native CommonCrypto as a benchmark...
import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
class AESCipher(object):
def __init__(self, key):
self.bs = 32
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 + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)
@staticmethod
def _unpad(s):
return s[:-ord(s[len(s)-1:])]
if __name__ == '__main__': # pragma: no cover
aes = AESCipher('this is my key')
plaintext = 'hello, I am very happy to meet you!'
print 'plain =', plaintext
ciphertext = aes.encrypt(plaintext)
print 'cipher =', ciphertext
plaintwo = aes.decrypt(ciphertext)
print 'plain2 =', plaintwo