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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | NOTE | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_prf(3) gnutls gnutls_prf(3)
gnutls_prf - API function
#include <gnutls/gnutls.h>
int gnutls_prf(gnutls_session_t session, size_t label_size, const
char * label, int server_random_first, size_t extra_size, const
char * extra, size_t outsize, char * out);
gnutls_session_t session
is a gnutls_session_t type.
size_t label_size
length of the label variable.
const char * label
label used in PRF computation, typically a short
string.
int server_random_first
non-zero if server random field should be first in
seed
size_t extra_size
length of the extra variable.
const char * extra
optional extra data to seed the PRF with.
size_t outsize
size of pre-allocated output buffer to hold the
output.
char * out pre-allocated buffer to hold the generated data.
Applies the TLS Pseudo-Random-Function (PRF) on the master secret
and the provided data, seeded with the client and server random
fields. For the key expansion specified in RFC5705 see
gnutls_prf_rfc5705().
The label variable usually contains a string denoting the
purpose for the generated data. The server_random_first
indicates whether the client random field or the server random
field should be first in the seed. Non-zero indicates that the
server random field is first, 0 that the client random field is
first.
The extra variable can be used to add more data to the seed,
after the random variables. It can be used to make sure the
generated output is strongly connected to some additional data
(e.g., a string used in user authentication).
The output is placed in out , which must be pre-allocated.
This function produces identical output with gnutls_prf_rfc5705()
when server_random_first is set to 0 and extra is NULL. Under
TLS1.3 this function will only operate when these conditions are
true, or otherwise return GNUTLS_E_INVALID_REQUEST.
GNUTLS_E_SUCCESS on success, or an error code.
Report bugs to <bugs@gnutls.org>.
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 bugs@gnutls.org. This page was obtained
from the tarball gnutls-3.8.5.tar.xz fetched from
⟨http://www.gnutls.org/download.html⟩ on 2024-06-14. 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 man-pages@man7.org
gnutls 3.8.5 gnutls_prf(3)
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HTML rendering created 2024-06-26 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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