@staticmethod<EOL><INDENT>def _create_payload(payload):<DEDENT>
blocks, remainder = divmod(len(payload), BLOCKSIZE)<EOL>if remainder > <NUM_LIT:0>:<EOL><INDENT>payload += (BLOCKSIZE - remainder) * NUL<EOL><DEDENT>return payload<EOL>
Return the string payload filled with zero bytes
           up to the next 512 byte border.