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@deftypefun {int} {gnutls_openpgp_crt_get_subkey_usage} (gnutls_openpgp_crt_t @var{key}, unsigned int @var{idx}, unsigned int * @var{key_usage})
@var{key}: should contain a gnutls_openpgp_crt_t structure
@var{idx}: the subkey index
@var{key_usage}: where the key usage bits will be stored
This function will return certificate's key usage, by checking the
key algorithm. The key usage value will ORed values of
@code{GNUTLS_KEY_DIGITAL_SIGNATURE} or @code{GNUTLS_KEY_KEY_ENCIPHERMENT} .
A negative error code may be returned in case of parsing error.
@strong{Returns:} key usage value.
@strong{Since:} 2.4.0
@end deftypefun
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