forked from p15670423/monkey
54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
import base64
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import os
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from Crypto import Random
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from Crypto.Cipher import AES
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from monkey_island.cc.consts import MONKEY_ISLAND_ABS_PATH
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__author__ = "itay.mizeretz"
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class Encryptor:
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_BLOCK_SIZE = 32
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_DB_PASSWORD_FILENAME = os.path.join(MONKEY_ISLAND_ABS_PATH, 'cc/mongo_key.bin')
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def __init__(self):
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self._load_key()
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def _init_key(self):
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self._cipher_key = Random.new().read(self._BLOCK_SIZE)
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with open(self._DB_PASSWORD_FILENAME, 'wb') as f:
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f.write(self._cipher_key)
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def _load_existing_key(self):
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with open(self._DB_PASSWORD_FILENAME, 'rb') as f:
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self._cipher_key = f.read()
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def _load_key(self):
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if os.path.exists(self._DB_PASSWORD_FILENAME):
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self._load_existing_key()
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else:
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self._init_key()
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def _pad(self, message):
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return message + (self._BLOCK_SIZE - (len(message) % self._BLOCK_SIZE)) * chr(
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self._BLOCK_SIZE - (len(message) % self._BLOCK_SIZE))
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def _unpad(self, message: str):
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return message[0:-ord(message[len(message) - 1])]
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def enc(self, message: str):
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cipher_iv = Random.new().read(AES.block_size)
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cipher = AES.new(self._cipher_key, AES.MODE_CBC, cipher_iv)
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return base64.b64encode(cipher_iv + cipher.encrypt(self._pad(message).encode())).decode()
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def dec(self, enc_message):
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enc_message = base64.b64decode(enc_message)
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cipher_iv = enc_message[0:AES.block_size]
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cipher = AES.new(self._cipher_key, AES.MODE_CBC, cipher_iv)
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return self._unpad(cipher.decrypt(enc_message[AES.block_size:]).decode())
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encryptor = Encryptor()
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