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# Copyright: (c) 2018, Jordan Borean (@jborean93) <jborean93@gmail.com> # MIT License (see LICENSE or https://opensource.org/licenses/MIT) import struct # Favour cryptography over our Python implementation as it is a lot faster try: from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes from cryptography.hazmat.backends import default_backend HAS_CRYPTOGRAPHY = True except ImportError: # pragma: no cover HAS_CRYPTOGRAPHY = False class _CryptographyARC4(object): def __init__(self, key): algo = algorithms.ARC4(key) cipher = Cipher(algo, mode=None, backend=default_backend()) self._encryptor = cipher.encryptor() def update(self, value): return self._encryptor.update(value) class _PythonARC4(object): state = None i = 0 j = 0 def __init__(self, key): # Split up the key into a list key_bytes = [] for i in range(len(key)): key_byte = struct.unpack("B", key[i:i + 1])[0] key_bytes.append(key_byte) # Key-scheduling algorithm (KSA) self.state = [n for n in range(256)] j = 0 for i in range(256): j = (j + self.state[i] + key_bytes[i % len(key_bytes)]) % 256 self.state[i], self.state[j] = self.state[j], self.state[i] def update(self, value): chars = [] random_gen = self._random_generator() for i in range(len(value)): byte = struct.unpack("B", value[i:i + 1])[0] updated_byte = byte ^ next(random_gen) chars.append(updated_byte) return bytes(bytearray(chars)) def _random_generator(self): # Pseudo-Random Generation Algorithm (PRGA) while True: self.i = (self.i + 1) % 256 self.j = (self.j + self.state[self.i]) % 256 self.state[self.i], self.state[self.j] = \ self.state[self.j], self.state[self.i] yield self.state[(self.state[self.i] + self.state[self.j]) % 256] if HAS_CRYPTOGRAPHY: ARC4 = _CryptographyARC4 else: # pragma: no cover ARC4 = _PythonARC4