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@deftypefun {int} {gnutls_x509_crt_get_fingerprint} (gnutls_x509_crt_t @var{cert}, gnutls_digest_algorithm_t @var{algo}, void * @var{buf}, size_t * @var{buf_size})
@var{cert}: should contain a @code{gnutls_x509_crt_t} type
@var{algo}: is a digest algorithm
@var{buf}: a pointer to a structure to hold the fingerprint (may be null)
@var{buf_size}: initially holds the size of @code{buf}
This function will calculate and copy the certificate's fingerprint
in the provided buffer. The fingerprint is a hash of the DER-encoded
data of the certificate.
If the buffer is null then only the size will be filled.
@strong{Returns:} @code{GNUTLS_E_SHORT_MEMORY_BUFFER} if the provided buffer is
not long enough, and in that case the *buf_size will be updated
with the required size. On success 0 is returned.
@end deftypefun
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