gnutls_prf man page on FreeBSD
gnutls_prf(3) gnutls gnutls_prf(3)
gnutls_prf - derive pseudo-random data using the TLS PRF
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);
is a gnutls_session_t structure.
length of the label variable.
const char * label
label used in PRF computation, typically a short string.
non-0 if server random field should be first in seed
length of the extra variable.
const char * extra
optional extra data to seed the PRF with.
size of pre-allocated output buffer to hold the output.
char * out pre-allocate buffer to hold the generated data.
Apply the TLS Pseudo-Random-Function (PRF) using the master secret on
some data, seeded with the client and server random fields.
The label variable usually contain a string denoting the purpose for
the generated data. The server_random_first indicate whether the
client random field or the server random field should be first in the
seed. Non-0 indicate 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 tie make sure the generated output
is strongly connected to some additional data (e.g., a string used in
The output is placed in *OUT, which must be pre-allocated.
GNUTLS_E_SUCCESS on success, or an error code.
Report bugs to <firstname.lastname@example.org>. GnuTLS home page:
http://www.gnu.org/software/gnutls/ General help using GNU software:
Copyright © 2008 Free Software Foundation.
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 info and gnutls programs are properly installed at your site,
should give you access to the complete manual.
gnutls 2.8.6 gnutls_prf(3)
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