centos man page for gnutls_prf

gnutls_prf(3)							      gnutls							     gnutls_prf(3)

NAME
       gnutls_prf - API function

SYNOPSIS
       #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);

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.

       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.

DESCRIPTION
       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.

RETURNS
       GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS
       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
       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.

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.  As an alternative you may obtain the manual from:

	      http://www.gnu.org/software/gnutls/manual/

gnutls								      3.1.15							     gnutls_prf(3)