gnutls_fingerprint(3) — Linux manual page


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 function.

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 © 2001-2023 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-3.8.2.tar.xz fetched from
       ⟨⟩ on 2023-12-22.  If you
       discover any rendering problems in this HTML version of the page,
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       manual page), send a mail to

gnutls                            3.8.2            gnutls_fingerprint(3)