This method is overridden by providers to return the parameters used with this signature engine, or null if.
If this signature engine does not use anyhas been previously initialized with parameters .The returned parameters may be(by calling the engineSetParameter
method), this method returns the same that were used to initializeparameters. If this signature engine , orhas not been initialized with parameters, this method may containreturn a combination of default and randomly generated parameter values used byif the underlying signature implementation if this signature engine requires algorithm parameters but was not initialized with anysupports it and can successfully generate them. Otherwise, null
is returned.