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@deftypefun {int} {gnutls_openpgp_crt_get_auth_subkey} (gnutls_openpgp_crt_t @var{crt}, gnutls_openpgp_keyid_t @var{keyid}, unsigned int @var{flag})
@var{crt}: the structure that contains the OpenPGP public key.
@var{keyid}: the struct to save the keyid.
@var{flag}: Non-zero indicates that a valid subkey is always returned.
Returns the 64-bit keyID of the first valid OpenPGP subkey marked
for authentication. If flag is non-zero and no authentication
subkey exists, then a valid subkey will be returned even if it is
not marked for authentication.
@strong{Returns:} @code{GNUTLS_E_SUCCESS} on success, or an error code.
@end deftypefun
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