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gnutls_hkdf_expand(3)               gnutls               gnutls_hkdf_expand(3)

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 (C) 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/local/share/doc/gnutls/ directory does not contain the HTML
       form visit

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

gnutls                               3.7.9               gnutls_hkdf_expand(3)