Api function
#include <gnutls/openpgp.h>
int gnutls_openpgp_crt_get_auth_subkey(gnutls_openpgp_crt_t crt, gnutls_openpgp_keyid_t keyid, unsigned int flag);
the structure that contains the OpenPGP public key.
the struct to save the keyid.
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.
GNUTLS_E_SUCCESS on success, or an error code.
Report bugs to <[email protected]>.
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