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.
Report bugs to <[email protected]>. GnuTLS home page: http://www.gnu.org/software/gnutls/ General help using GNU software: http://www.gnu.org/gethelp/
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.
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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. |