docs: def decrypt_block(self, cipherText):
      """Decrypt a 16-byte block of data.
  
      NOTE: This function was formerly called `decrypt`, but was changed when
      support for decrypting arbitrary-length strings was added.
  
      Args:
          cipherText (str): 16-byte data.
  
      Returns:
          16-byte str.
  
      Raises:
          TypeError if CamCrypt object has not been initialized.
          ValueError if `cipherText` is not BLOCK_SIZE (i.e. 16) bytes.
      """
      if not self.initialized:
        raise TypeError("CamCrypt object has not been initialized")
      if len(cipherText) != BLOCK_SIZE:
        raise ValueError("cipherText must be %d bytes long (received %d bytes)" %
                         (BLOCK_SIZE, len(cipherText)))
      plain = ctypes.create_string_buffer(BLOCK_SIZE)
      self.decblock(self.bitlen, cipherText, self.keytable, plain)
      return plain.raw