Python-сообщество

  BLOCK_SIZE = 16
    def aes_decrypt(self, key, data):
        if len(data) > BLOCK_SIZE:
            IV = data[:BLOCK_SIZE]
            cipher = AES.new(key, AES.MODE_CBC, IV)
            return self.unpad(cipher.decrypt(data[BLOCK_SIZE:]))
 
    def unpad(self, s):
        return s[:-(ord(s[-1]))]

  
>>> from Crypto.Cipher import AES
>>> from Crypto import Random
>>> 
>>> msg = b'Attack at dawn..'
>>> 
>>> key = b'Sixteen byte key'
>>> 
>>> AES.block_size
16
>>> 
>>> iv = Random.new().read(AES.block_size)
>>> iv
b'\xd3\x07 S1y\x8a\xc1\xbd\x95\xae\xc9\xb8^h:'
>>> 
>>> cipher = AES.new(key, AES.MODE_CBC, iv)
>>> emsg = iv + cipher.encrypt(msg)
>>> emsg
b'\xd3\x07 S1y\x8a\xc1\xbd\x95\xae\xc9\xb8^h:\x83\xa076\xd6\xf0\x84\x825\x85D\xe6\x1b\xcf\xdc\xd9'
>>> 
>>> iv = emsg[:AES.block_size]
>>> iv
b'\xd3\x07 S1y\x8a\xc1\xbd\x95\xae\xc9\xb8^h:'
>>> cipher = AES.new(key, AES.MODE_CBC, iv)
>>> dmsg = cipher.decrypt(emsg[AES.block_size:])
>>> dmsg
b'Attack at dawn..'
>>>