gnutls_srp_set_server_fake_salt_seed - API function
cred, const gnutls_datum_t * seed, unsigned int
- 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
This function sets the seed that is used to generate salts for invalid
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.
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
is allocated and fake salts are 16
Report bugs to <email@example.com>.
Home page: https://www.gnutls.org
Copyright © 2001-2019 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.
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