@property<EOL><INDENT>def signature_type(self):<DEDENT>
if not self.mardata.signatures:<EOL><INDENT>return None<EOL><DEDENT>for sig in self.mardata.signatures.sigs:<EOL><INDENT>if sig.algorithm_id == <NUM_LIT:1>:<EOL><INDENT>return '<STR_LIT>'<EOL><DEDENT>elif sig.algorithm_id == <NUM_LIT:2>:<EOL><INDENT>return '<STR_LIT>'<EOL><DEDENT><DEDENT>else:<EOL><INDENT>return '<STR_LIT>'<EOL><DEDENT>
Return the signature type used in this MAR.

        Returns:
            One of None, 'unknown', 'sha1', or 'sha384'