code: def _cryptography_cipher(key, iv):
      
      return Cipher(
          algorithm=algorithms.TripleDES(key),
          mode=modes.CBC(iv),
          backend=default_backend()
      )
docs: Build a cryptography TripleDES Cipher object.
  
      :param bytes key: Encryption key
      :param bytesiv iv: Initialization vector
      :returns: TripleDES Cipher instance
      :rtype: cryptography.hazmat.primitives.ciphers.Cipher