gnutls_srp_set_server_fake_salt_seed

gnutls_srp_set_server_fake_salt_seed(gnutgnutls_srp_set_server_fake_salt_seed(3)



NAME
       gnutls_srp_set_server_fake_salt_seed - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       void gnutls_srp_set_server_fake_salt_seed(gnutls_srp_server_credentials_t
       cred, const gnutls_datum_t * seed, unsigned int salt_length);

ARGUMENTS
       gnutls_srp_server_credentials_t cred
                   is a gnutls_srp_server_credentials_t type

       const gnutls_datum_t * seed
                   is the seed data, only needs to be valid until the function
                   returns; size of the seed must be greater than zero

       unsigned int salt_length
                   is the length of the generated fake salts

DESCRIPTION
       This function sets the seed that is used to generate salts for invalid
       (non-existent) usernames.

       In order to prevent attackers from guessing valid usernames, when a user
       does not exist gnutls generates a salt and a verifier and proceeds with
       the protocol as usual.  The authentication will ultimately fail, but the
       client cannot tell whether the username is valid (exists) or invalid.

       If an attacker learns the seed, given a salt (which is part of the
       handshake) which was generated when the seed was in use, it can tell
       whether or not the authentication failed because of an unknown username.
       This seed cannot be used to reveal application data or passwords.

        salt_length should represent the salt length your application uses.
       Generating fake salts longer than 20 bytes is not supported.

       By default the seed is a random value, different each time a
       gnutls_srp_server_credentials_t is allocated and fake salts are 16 bytes
       long.

SINCE
       3.3.0

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                                3.4gnutls_srp_set_server_fake_salt_seed(3)