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gnutls_prf

gnutls_prf(3)							      gnutls							     gnutls_prf(3)

NAME

       gnutls_prf - derive pseudo-random data using the TLS PRF

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-allocate buffer to hold the generated data.

DESCRIPTION

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

       The label variable usually contain a string denoting the purpose for the generated data.   The  server_random_first  indicate  whether  the
       client  random  field or the server random field should be first in the seed.  Non-0 indicate 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 tie	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>.   GnuTLS  home  page:  http://www.gnu.org/software/gnutls/  General  help  using  GNU  software:
       http://www.gnu.org/gethelp/

COPYRIGHT

       Copyright (C) 2008 Free Software Foundation.
       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.

gnutls								       2.8.6							     gnutls_prf(3)

Shell Programming and Scripting