NAME

       gnutls_prf_raw - API function

SYNOPSIS

       #include <gnutls/gnutls.h>

       int gnutls_prf_raw(gnutls_session_t session, size_t label_size, const char * label, size_t
       seed_size, const char * seed, 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.

       size_t seed_size
                   length of the  seed variable.

       const char * seed
                   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.

       The  label variable usually contains a string denoting the purpose for the generated data.
       The   seed  usually  contains  data such as the client and server random, perhaps together
       with some additional data that is added to  guarantee  uniqueness  of  the  output  for  a
       particular purpose.

       Because  the  output  is not guaranteed to be unique for a particular session unless  seed
       includes the client random and server random fields (the PRF would output the same data on
       another connection resumed from the first one), it is not recommended to use this function
       directly.  The gnutls_prf() function seeds the PRF  with  the  client  and  server  random
       fields  directly, and is recommended if you want to generate pseudo random data unique for
       each session.

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 © 2001-2021 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/