gnutls_hmac_init(3)                gnutls                gnutls_hmac_init(3)

NAME         top

       gnutls_hmac_init - API function

SYNOPSIS         top

       #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         top

       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         top

       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         top

       Zero or a negative error code on error.

SINCE         top


REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2018 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         top

       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 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
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gnutls                              3.6.2                gnutls_hmac_init(3)