def METHOD_NAME(self, ciphertext):
    """Decrypt a piece of data.
    :param ciphertext: The data to decrypt, of any size.
    :type ciphertext: bytes, bytearray, memoryview
    :returns: the decrypted byte string, of equal length as the
      ciphertext.
    """
    try:
        return self.encrypt(ciphertext)
    except ValueError as e:
        raise ValueError(str(e).replace("enc", "dec"))