gnutls_prf — derive pseudo-random data using the TLS PRF
#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); |
is a gnutls_session_t structure.
length of the label variable.
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.
optional extra data to seed the PRF with.
size of pre-allocated output buffer to hold the output.
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 user authentication).
The output is placed in *OUT, which must be pre−allocated.
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.
| COPYRIGHT |
|---|
|
Copyright © 2008 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. |