gnutls_srp_set_server_credentials_function

gnutls_srp_set_server_credentials_fgnutlslsrp_set_server_credentials_function(3)



NAME
       gnutls_srp_set_server_credentials_function - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       void
       gnutls_srp_set_server_credentials_function(gnutls_srp_server_credentials_t
       cred, gnutls_srp_server_credentials_function         * func);

ARGUMENTS
       gnutls_srp_server_credentials_t         cred
                   is a gnutls_srp_server_credentials_t type.

       gnutls_srp_server_credentials_function         * func
                   is the callback function

DESCRIPTION
       This function can be used to set a callback to retrieve the user's SRP
       credentials.  The callback's function form is:

       int (*callback)(gnutls_session_t, const char* username, gnutls_datum_t
       *salt, gnutls_datum_t *verifier, gnutls_datum_t *generator,
       gnutls_datum_t *prime);

        username contains the actual username.  The  salt ,  verifier ,
       generator and  prime must be filled in using the gnutls_malloc(). For
       convenience  prime and  generator may also be one of the static
       parameters defined in gnutls.h.

       Initially, the data field is NULL in every gnutls_datum_t structure that
       the callback has to fill in. When the callback is done GnuTLS deallocates
       all of those buffers which are non-NULL, regardless of the return value.

       In order to prevent attackers from guessing valid usernames, if a user
       does not exist, g and n values should be filled in using a random user's
       parameters. In that case the callback must return the special value (1).
       See gnutls_srp_set_server_fake_salt_seed too.  If this is not required
       for your application, return a negative number from the callback to abort
       the handshake.

       The callback function will only be called once per handshake.  The
       callback function should return 0 on success, while -1 indicates an
       error.

REPORTING BUGS
       Report bugs to <bugs@gnutls.org>.
       Home page: http://www.gnutls.org


COPYRIGHT
       Copyright © 2001-2016 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification, are
       permitted in any medium without royalty provided the copyright notice and
       this notice are preserved.

SEE ALSO
       The full documentation for gnutls is maintained as a Texinfo manual.  If
       the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

       http://www.gnutls.org/manual/

gnutls                             gnutls.srp_set_server_credentials_function(3)