manpagez: man pages & more
man gnutls_prf(3)
Home | html | info | man
gnutls_prf(3)                       gnutls                       gnutls_prf(3)




NAME

       gnutls_prf - API function


SYNOPSIS

       #include <gnutls/gnutls.h>

       gnutls_prf(3) 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 type.

       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-zero 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

       Applies  the  TLS Pseudo-Random-Function (PRF) on the master secret and
       the provided data, seeded with the client  and  server  random  fields.
       For the key expansion specified in RFC5705 see gnutls_prf_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-zero 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.


NOTE

       This function produces identical output with gnutls_prf_rfc5705()  when
       server_random_first  is  set to 0 and  extra is NULL. Under TLS1.3 this
       function will only operate when these conditions are true, or otherwise
       return GNUTLS_E_INVALID_REQUEST.


RETURNS

       GNUTLS_E_SUCCESS on success, or an error code.


REPORTING BUGS

       Report bugs to <bugs@gnutls.org>.
       Home page: http://www.gnutls.org



COPYRIGHT

       Copyright (C) 2001-2018 Free Software Foundation, Inc., and others.
       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 /usr/share/doc/gnutls/ directory does not contain the HTML  form
       visit

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




gnutls                               3.6.5                       gnutls_prf(3)

gnutls 3.6.5 - Generated Sun Jan 20 18:26:15 CST 2019
© manpagez.com 2000-2024
Individual documents may contain additional copyright information.