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@deftypefun {int} {gnutls_openpgp_privkey_get_subkey_fingerprint} (gnutls_openpgp_privkey_t @var{key}, unsigned int @var{idx}, void * @var{fpr}, size_t * @var{fprlen})
@var{key}: the raw data that contains the OpenPGP secret key.
@var{idx}: the subkey index
@var{fpr}: the buffer to save the fingerprint, must hold at least 20 bytes.
@var{fprlen}: the integer to save the length of the fingerprint.
Get the fingerprint of an OpenPGP subkey. Depends on the
algorithm, the fingerprint can be 16 or 20 bytes.
@strong{Returns:} On success, 0 is returned, or an error code.
@strong{Since:} 2.4.0
@end deftypefun
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