diff --git a/tools/cert_create/include/ext.h b/tools/cert_create/include/ext.h
index 60455e6..3c65473 100644
--- a/tools/cert_create/include/ext.h
+++ b/tools/cert_create/include/ext.h
@@ -56,6 +56,7 @@
 				 *   - V_ASN1_OCTET_STRING
 				 */
 	int type;
+	const char *opt;	/* Command line option to specify data */
 	/* Extension data (depends on extension type) */
 	union {
 		const char *fn;	/* File with extension data */
@@ -79,7 +80,8 @@
 };
 
 /* Exported API */
-int ext_register(ext_t *tbb_ext);
+int ext_init(void);
+ext_t *ext_get_by_opt(const char *opt);
 X509_EXTENSION *ext_new_hash(int nid, int crit, const EVP_MD *md,
 		unsigned char *buf, size_t len);
 X509_EXTENSION *ext_new_nvcounter(int nid, int crit, int value);