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       gnutls_srp_set_server_credentials_function  - Used to set a callback to
       retrieve the user’s SRP credentials


       #include <gnutls/gnutls.h>

       cred, gnutls_srp_server_credentials_function          * func);


       gnutls_srp_server_credentials_t          cred
                   is a gnutls_srp_server_credentials_t structure.

       gnutls_srp_server_credentials_function          * func
                   is the callback function


       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* g, gnutls_datum_t* n);

       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

       In case the callback returned a negative number then gnutls will assume
       that the username does not exist.

       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).

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


       Report   bugs   to    <>.     GnuTLS    home    page:  General  help  using GNU software:


       Copyright © 2008 Free Software Foundation.
       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.


       The full documentation for gnutls is maintained as  a  Texinfo  manual.
       If  the  info  and gnutls programs are properly installed at your site,
       the command

              info gnutls

       should give you access to the complete manual.

gnutls                           gnutls8srp_set_server_credentials_function(3)