tells whether or not this credential has been destroyed , and that the certificate and private key fields are null . concode_field_sep X509Certificate certificate concode_elem_sep String alias concode_elem_sep PrivateKey key concode_field_sep X509Certificate getCertificate concode_elem_sep void destroy concode_elem_sep PrivateKey getPrivateKey concode_elem_sep String getAlias
boolean function ( ) { return certificate == null && key == null ; }