NAME

       gnutls_hkdf_expand - API function

SYNOPSIS

       #include <gnutls/crypto.h>

       int  gnutls_hkdf_expand(gnutls_mac_algorithm_t  mac,  const  gnutls_datum_t  *  key, const
       gnutls_datum_t * info, void * output, size_t length);

ARGUMENTS

       gnutls_mac_algorithm_t mac
                   the mac algorithm used internally

       const gnutls_datum_t * key
                   the pseudorandom key created with HKDF-Extract

       const gnutls_datum_t * info
                   the optional informational data

       void * output
                   the output value of the expand operation

       size_t length
                   the desired length of the output key

DESCRIPTION

       This function will derive a variable length keying  material  from  the  pseudorandom  key
       using the HKDF-Expand function as defined in RFC 5869.

RETURNS

       Zero or a negative error code on error.

SINCE

       3.6.13

REPORTING BUGS

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

COPYRIGHT

       Copyright © 2001- 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

       https://www.gnutls.org/manual/