CKA_ENCRYPT
add_object_attribute(o, 0, CKA_ENCRYPT, &bool_true, sizeof(bool_true));
FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));