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gnutls_srp_set_server_credentials_function(3)                           gnutls


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: https://www.gnutls.org


COPYRIGHT

       Copyright (C) 2001- 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/local/share/doc/gnutls/ directory does not contain the HTML
       form visit

       https://www.gnutls.org/manual/

gnutls                               3.7.9
                                 gnutls_srp_set_server_credentials_function(3)

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