def populate(self, node_generator):
        """
        Populate Merkle Tree with data from node_generator. This requires that node_generator yield byte[] elements.
        Hashes, computes hex digest, and adds it to the Merkle Tree
        :param node_generator:
        :return:
        """
        for data in node_generator:
            hashed = hash_byte_array(data)
            self.tree.add_leaf(hashed)