gnutls_prf man page on aLinux
[printable version]
gnutls_prf(3) gnutls gnutls_prf(3)
NAME
gnutls_prf - derive pseudo-random data using the TLS PRF
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-allocate buffer to hold the generated data.
DESCRIPTION
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
user authentication).
The output is placed in *OUT, which must be pre-allocated.
RETURN VALUE
Return 0 on success, or an error code.
REPORTING BUGS
Report bugs to <bug-gnutls@gnu.org>.
COPYRIGHT
Copyright © 2004 Free Software Foundation.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
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.
gnutls 1.4.4 gnutls_prf(3)
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