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Encrypt & Decrypt using PyCrypto AES 256
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| import base64 | |
| import hashlib | |
| from Crypto import Random | |
| from Crypto.Cipher import AES | |
| class AESCipher(object): | |
| def __init__(self, length, key): | |
| self.bs = length | |
| 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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