tests: WPS against external implementation

This adds a Python-based minimal WSC protocol implementation to allow
more testing coverage to be reached for various error cases in protected
attributes. The wps_ext test case completes successful exchange in both
the Enrollee and Registrar roles acting in the middle of AP and STA. The
other test cases cover error cases.

Signed-off-by: Jouni Malinen <j@w1.fi>
1 file changed