given provider side key exchange context I<ctx> to I<params>,
see L</Common Key Exchange parameters>.
Any parameter settings are additional to any that were previously set.
+Passing NULL for I<params> should return true.
OSSL_FUNC_keyexch_get_ctx_params() gets key exchange parameters associated with the
given provider side key exchange context I<ctx> into I<params>,
see L</Common Key Exchange parameters>.
+Passing NULL for I<params> should return true.
OSSL_FUNC_keyexch_settable_ctx_params() yields a constant B<OSSL_PARAM> array that
describes the settable parameters, i.e. parameters that can be used with