suse man page for gnutls_prf_raw

gnutls_prf_raw(3)						      gnutls							 gnutls_prf_raw(3)

NAME
       gnutls_prf_raw - access the TLS PRF directly

SYNOPSIS
       #include <gnutls/gnutls.h>

       int  gnutls_prf_raw(gnutls_session_t  session,  size_t label_size, const char * label, size_t seed_size, const char * seed, 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.

       size_t seed_size
		   length of the seed variable.

       const char * seed
		   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.

       The label variable usually contain a string denoting the purpose for the generated data.  The seed usually contain data such as the  client
       and server random, perhaps together with some additional data that is added to guarantee uniqueness of the output for a particular purpose.

       Because	the  output is not guaranteed to be unique for a particular session unless seed include the client random and server random fields
       (the PRF would output the same data on another connection resumed from the first one), it is not recommended to use this function directly.
       The gnutls_prf() function seed the PRF with the client and server random fields directly, and is recommended if you want to generate pseudo
       random data unique for each session.

RETURNS
       GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS
       Report  bugs  to  <bug-gnutls@gnu.org>.	 GnuTLS  home  page:  http://www.gnu.org/software/gnutls/  General  help   using   GNU	 software:
       http://www.gnu.org/gethelp/

COPYRIGHT
       Copyright (C) 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.

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								       2.8.6							 gnutls_prf_raw(3)