How to implement new supplemental data

[LATZE Carolin]

Hi everybody,

I try to implement a TLS extensions that requires to send supplemental data too (umm.... is this the right list for that problem?)

I found a pretty good tutorial about how to add a new extension (http://www.gnu.org/software/gnutls/devel/manual/html_node/TLS-Extension-Handling.html). However I did not find any documentation about how to implement the supplemental data message, which is why I grep'ed through the code and tried to understand it. I think it is done the following way (could somebody please confirm that?):

in lib/gnutls_supplemental.c add a quadruple to _gnutls_supplemental[], e.g.:

gnutls_supplemental_entry _gnutls_supplemental[] = {
  { "foobar_data",
    GNUTLS_SUPPLEMENTAL_FOOBAR_DATA,
    gnutls_foobar_supp_recv_params,
    gnutls_foobar_supp_send_params },
  {0, 0, 0, 0}
};

Afterwards add gnutls_foobar_supp_recv_params and gnutls_foobar_supp_send_params to ext_foobar.{h|c} and implement it. In gnutls_foobar_recv_param and/ or gnutls_foobar_send_param set do_send_supplemental and/ or do_recv_supplemental.

Is that all (sounds somehow too simple :-D)

Cheers
Carolin