39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
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:
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"""
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Simple AES cipher used to provide cookie support to the frontend.
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"""
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def __init__(self, key: str) -> None:
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self.__padamt = 16
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self.__key = hashlib.sha256(key.encode('utf-8')).digest()
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def _pad(self, s: str) -> str:
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intermediate = f"{len(s)}.{s}"
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while len(intermediate) % self.__padamt != 0:
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intermediate = intermediate + '-'
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return intermediate
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def _unpad(self, s: str) -> str:
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length, string = s.split('.', 1)
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intlength = int(length)
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return string[:intlength]
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def encrypt(self, raw: str) -> str:
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raw = self._pad(raw)
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random = Random.new()
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iv = random.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.encode('utf-8')), altchars=b"._").decode('utf-8')
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def decrypt(self, encoded: str) -> str:
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enc = base64.b64decode(encoded.encode('utf-8'), altchars=b"._")
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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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