DOKK / manpages / debian 12 / gnutls-doc / gnutls_fingerprint.3.en
gnutls_fingerprint(3) gnutls gnutls_fingerprint(3)

gnutls_fingerprint - API function

#include <gnutls/gnutls.h>

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

is a digest algorithm
is the data
is the place where the result will be copied (may be null).
should hold the size of the result. The actual size of the returned result will also be copied there.

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.

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

Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org

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3.7.9 gnutls