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https://github.com/tcsenpai/hmacrypt.git
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43 lines
1.2 KiB
Python
43 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(object):
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def __init__(self, key):
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self.bs = AES.block_size
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self.key = hashlib.sha256(key.encode()).digest()
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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.encode()))
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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 AESCipher._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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# Implementable methods
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# NOTE The cipher is initialized on the fly, so the seed is not stored
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def self_encrypt_aes(seed, message):
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cipher = AESCipher(seed)
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encrypted = cipher.encrypt(message)
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return encrypted
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def self_decrypt_aes(seed, encrypted):
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cipher = AESCipher(seed)
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decrypted = cipher.decrypt(encrypted)
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return decrypted
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