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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,  as
       specified in RFC5705.

       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 © 2001-2013 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				     3.2.4			 gnutls_prf(3)
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