NAME

       gnutls_hmac_init - API function

SYNOPSIS

       #include <gnutls/crypto.h>

       int  gnutls_hmac_init(gnutls_hmac_hd_t * dig, gnutls_mac_algorithm_t algorithm, const void
       * key, size_t keylen);

ARGUMENTS

       gnutls_hmac_hd_t * dig
                   is a gnutls_hmac_hd_t type

       gnutls_mac_algorithm_t algorithm
                   the HMAC algorithm to use

       const void * key
                   the key to be used for encryption

       size_t keylen
                   the length of the key

DESCRIPTION

       This function  will  initialize  an  context  that  can  be  used  to  produce  a  Message
       Authentication  Code  (MAC) of data.  This will effectively use the current crypto backend
       in use by gnutls or the cryptographic accelerator in use.

       Note that despite the name of this function, it can be used for other MAC algorithms  than
       HMAC.

RETURNS

       Zero or a negative error code on error.

SINCE

       2.10.0

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/