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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_srp_se...ake_salt_seed(3) gnutls gnutls_srp_se...ake_salt_seed(3)
gnutls_srp_set_server_fake_salt_seed - API function
#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);
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 (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.
3.3.0
Report bugs to <[email protected]>.
Home page: https://www.gnutls.org
Copyright © 2001-2023 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
https://www.gnutls.org/manual/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to [email protected]. This page was obtained
from the tarball fetched from
⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to [email protected]
gnutls 3.8.10 gnutls_srp_se...ake_salt_seed(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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