Created
January 28, 2015 13:16
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A Simple AES Cipher comptabiel with Python 3
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class AESCipher(object): | |
""" | |
A classical AES Cipher. Can use any size of data and any size of password thanks to padding. | |
Also ensure the coherence and the type of the data with a unicode to byte converter. | |
""" | |
def __init__(self, key): | |
self.bs = 32 | |
self.key = hashlib.sha256(AESCipher.str_to_bytes(key)).digest() | |
@staticmethod | |
def str_to_bytes(data): | |
u_type = type(b''.decode('utf8')) | |
if isinstance(data, u_type): | |
return data.encode('utf8') | |
return data | |
def _pad(self, s): | |
return s + (self.bs - len(s) % self.bs) * AESCipher.str_to_bytes(chr(self.bs - len(s) % self.bs)) | |
@staticmethod | |
def _unpad(s): | |
return s[:-ord(s[len(s)-1:])] | |
def encrypt(self, raw): | |
raw = self._pad(AESCipher.str_to_bytes(raw)) | |
iv = Random.new().read(AES.block_size) | |
cipher = AES.new(self.key, AES.MODE_CBC, iv) | |
return base64.b64encode(iv + cipher.encrypt(raw)).decode('utf-8') | |
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') |
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