Provided by: gnutls-doc_3.5.18-1ubuntu1.6_all 
NAME
gnutls_prf - API function
SYNOPSIS
#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);
ARGUMENTS
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.
DESCRIPTION
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.
NOTE
This function produces identical output with gnutls_prf_rfc5705() when server_random_first is set to 0
and extra is NULL.
RETURNS
GNUTLS_E_SUCCESS on success, or an error code.
REPORTING BUGS
Report bugs to <bugs@gnutls.org>. Home page: http://www.gnutls.org
COPYRIGHT
Copyright © 2001-2022 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/