diff --git a/tools/cert_create/include/key.h b/tools/cert_create/include/key.h
index 8819750..dfb3150 100644
--- a/tools/cert_create/include/key.h
+++ b/tools/cert_create/include/key.h
@@ -35,6 +35,21 @@
 
 #define RSA_KEY_BITS		2048
 
+/* Error codes */
+enum {
+	KEY_ERR_NONE,
+	KEY_ERR_MALLOC,
+	KEY_ERR_FILENAME,
+	KEY_ERR_OPEN,
+	KEY_ERR_LOAD
+};
+
+/* Supported key algorithms */
+enum {
+	KEY_ALG_RSA,
+	KEY_ALG_ECDSA
+};
+
 /*
  * This structure contains the relevant information to create the keys
  * required to sign the certificates.
@@ -50,8 +65,8 @@
 	EVP_PKEY *key;		/* Key container */
 } key_t;
 
-int key_new(key_t *key);
-int key_load(key_t *key);
+int key_create(key_t *key, int type);
+int key_load(key_t *key, unsigned int *err_code);
 int key_store(key_t *key);
 
 #endif /* KEY_H_ */