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CentOS 7.0 - man page for gnutls_prf_raw (centos section 3)

gnutls_prf_raw(3)			      gnutls				gnutls_prf_raw(3)

       gnutls_prf_raw - API function

       #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);

       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-allocated buffer to hold the generated data.

       Apply the TLS Pseudo-Random-Function (PRF) on the master secret and the provided data.

       The  label variable usually contains a string denoting the purpose for the generated data.
       The   seed  usually  contains  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  par-
       ticular purpose.

       Because	the  output  is not guaranteed to be unique for a particular session unless  seed
       includes 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 seeds 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.

       GNUTLS_E_SUCCESS on success, or an error code.

       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

       Copyright (C) 2012 Free Software Foundation, Inc..
       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, the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the  man-
       ual from:


gnutls					      3.1.15				gnutls_prf_raw(3)

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