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38 lines
994 B
Python
38 lines
994 B
Python
from __future__ import absolute_import
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import base64
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import hashlib
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from Crypto import Random
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from Crypto.Cipher import AES
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class AESCipher(object):
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"""
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Helper class for encrypting and decrypting data via AES.
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Copied From: http://stackoverflow.com/a/21928790
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"""
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def __init__(self, key):
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self.bs = 32
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self.key = key
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def encrypt(self, raw):
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raw = self._pad(raw)
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iv = Random.new().read(AES.block_size)
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cipher = AES.new(self.key, AES.MODE_CBC, iv)
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return base64.b64encode(iv + cipher.encrypt(raw))
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def decrypt(self, enc):
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enc = base64.b64decode(enc)
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iv = enc[: AES.block_size]
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cipher = AES.new(self.key, AES.MODE_CBC, iv)
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return self._unpad(cipher.decrypt(enc[AES.block_size :])).decode("utf-8")
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def _pad(self, s):
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return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)
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@staticmethod
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def _unpad(s):
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return s[: -ord(s[len(s) - 1 :])]
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