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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | NOTE | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_prf_raw(3) gnutls gnutls_prf_raw(3)
gnutls_prf_raw - API function
#include <gnutls/gnutls.h>
int gnutls_prf_raw(gnutls_session_t session, size_t label_size,
const char * label, size_t seed_size, const char * seed, 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.
size_t seed_size
length of the seed variable.
const char * seed
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.
Apply the TLS Pseudo-Random-Function (PRF) on the master secret
and the provided data.
The label variable usually contains a string denoting the purpose
for the generated data. The seed usually contains data such as
the client and server random, perhaps together with some
additional data that is added to guarantee uniqueness of the
output for a particular purpose.
Because the output is not guaranteed to be unique for a particular
session unless seed includes the client random and server random
fields (the PRF would output the same data on another connection
resumed from the first one), it is not recommended to use this
function directly. The gnutls_prf() function seeds the PRF with
the client and server random fields directly, and is recommended
if you want to generate pseudo random data unique for each
session.
This function will only operate under TLS versions prior to 1.3.
In TLS1.3 the use of PRF is replaced with HKDF and the generic
exporters like gnutls_prf_rfc5705() should be used instead. Under
TLS1.3 this function returns 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 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 man-pages@man7.org
gnutls 3.8.10 gnutls_prf_raw(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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