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

gnutls_prf(3)				      gnutls				    gnutls_prf(3)

       gnutls_prf - API function

       #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);

       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-allocated buffer to hold the generated data.

       Apply the TLS Pseudo-Random-Function (PRF) on the master secret	and  the  provided  data,
       seeded with the client and server random fields.

       The  label variable usually contains a string denoting the purpose for the generated data.
       The  server_random_first indicates whether the client random field or  the  server  random
       field should be first in the seed.  Non-0 indicates 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 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.

       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(3)

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