gnutls_fingerprint man page

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);


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 null).

size_t * result_size

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.

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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


3.5.9 gnutls