gnutls_fingerprint(3)              gnutls              gnutls_fingerprint(3)

NAME         top

       gnutls_fingerprint - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_fingerprint(gnutls_digest_algorithm_t algo, const
       gnutls_datum_t * data, void * result, size_t * result_size);

ARGUMENTS         top

       gnutls_digest_algorithm_t algo
                   is a digest algorithm

       const gnutls_datum_t * data
                   is the data

       void * result
                   is the place where the result will be copied (may be

       size_t * result_size
                   should hold the size of the result. The actual size of
                   the returned result will also be copied there.

DESCRIPTION         top

       This function will calculate a fingerprint (actually a hash), of the
       given data.  The result is not printable data.  You should convert it
       to hex, or to something else printable.

       This is the usual way to calculate a fingerprint of an X.509 DER
       encoded certificate.  Note however that the fingerprint of an OpenPGP
       certificate is not just a hash and cannot be calculated with this

RETURNS         top

       On success, GNUTLS_E_SUCCESS (0) is returned, otherwise an error code
       is returned.

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
       tarball gnutls-3.6.2.tar.xz fetched from
       ⟨⟩ on 2018-04-30.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

gnutls                              3.6.2              gnutls_fingerprint(3)