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 © 2001-2022 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/