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- #!python3
- import base64
- import hashlib
- from Crypto.Cipher import AES
- from Crypto import Random
- 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:])]
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