gnutls_srp_set_server_credentials_function — API function
#include <gnutls/gnutls.h>
void
gnutls_srp_set_server_credentials_function( |
gnutls_srp_server_credentials_t cred, |
gnutls_srp_server_credentials_function *
func); |
is a gnutls_srp_server_credentials_t structure.
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* 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.
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.
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
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