* ostree_sign_data:
* @self: an #OstreeSign object
* @data: the raw data to be signed with pre-loaded secret key
- * @signature: in case of success will contain signature
+ * @signature: (out): in case of success will contain signature
* @cancellable: A #GCancellable
* @error: a #GError
*
* @self: an #OstreeSign object
* @data: the raw data to check
* @signatures: the signatures to be checked
+ * @out_success_message: (out) (nullable) (optional): success message returned by the signing engine
* @error: a #GError
*
* Verify given data against signatures with pre-loaded public keys.
* @self: an #OstreeSign object
* @repo: an #OsreeRepo object
* @commit_checksum: SHA256 of given commit to verify
+ * @out_success_message: (out) (nullable) (optional): success message returned by the signing engine
* @cancellable: A #GCancellable
* @error: a #GError
*