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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.

       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 © 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)
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