02-01-2019
I wrote some additional approaches in my page. And there was an extra variable (used for debugging) that I now removed in the first example. The is a space between the brackets in the field separator that should not be there in your example:
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LEARN ABOUT CENTOS
gnutls_prf
gnutls_prf(3) gnutls gnutls_prf(3)
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 structure.
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-0 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
Apply the TLS Pseudo-Random-Function (PRF) on the master secret and the provided data, seeded with the client and server random fields.
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-0 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.
RETURNS
GNUTLS_E_SUCCESS on success, or an error code.
REPORTING BUGS
Report bugs to <bug-gnutls@gnu.org>.
General guidelines for reporting bugs: http://www.gnu.org/gethelp/
GnuTLS home page: http://www.gnu.org/software/gnutls/
COPYRIGHT
Copyright (C) 2012 Free Software Foundation, Inc..
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 info and gnutls programs are properly installed at your site,
the command
info gnutls
should give you access to the complete manual. As an alternative you may obtain the manual from:
http://www.gnu.org/software/gnutls/manual/
gnutls 3.1.15 gnutls_prf(3)