diff --git a/tools/cert_create/include/cert.h b/tools/cert_create/include/cert.h
index daf27a7..e63b474 100644
--- a/tools/cert_create/include/cert.h
+++ b/tools/cert_create/include/cert.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -57,11 +57,20 @@
 
 /* Macro to register the certificates used in the CoT */
 #define REGISTER_COT(_certs) \
-	cert_t *certs = &_certs[0]; \
-	const unsigned int num_certs = sizeof(_certs)/sizeof(_certs[0])
+	cert_t *def_certs = &_certs[0]; \
+	const unsigned int num_def_certs = sizeof(_certs)/sizeof(_certs[0])
+
+/* Macro to register the platform defined certificates used in the CoT */
+#define PLAT_REGISTER_COT(_pdef_certs) \
+	cert_t *pdef_certs = &_pdef_certs[0]; \
+	const unsigned int num_pdef_certs = sizeof(_pdef_certs)/sizeof(_pdef_certs[0])
 
 /* Exported variables */
-extern cert_t *certs;
-extern const unsigned int num_certs;
+extern cert_t *def_certs;
+extern const unsigned int num_def_certs;
+extern cert_t *pdef_certs;
+extern const unsigned int num_pdef_certs;
 
+extern cert_t *certs;
+extern unsigned int num_certs;
 #endif /* CERT_H */
diff --git a/tools/cert_create/include/ext.h b/tools/cert_create/include/ext.h
index 9c0b5c3..e900a6d 100644
--- a/tools/cert_create/include/ext.h
+++ b/tools/cert_create/include/ext.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -75,11 +75,20 @@
 
 /* Macro to register the extensions used in the CoT */
 #define REGISTER_EXTENSIONS(_ext) \
-	ext_t *extensions = &_ext[0]; \
-	const unsigned int num_extensions = sizeof(_ext)/sizeof(_ext[0])
+	ext_t *def_extensions = &_ext[0]; \
+	const unsigned int num_def_extensions = sizeof(_ext)/sizeof(_ext[0])
+
+/* Macro to register the platform defined extensions used in the CoT */
+#define PLAT_REGISTER_EXTENSIONS(_pdef_ext) \
+	ext_t *pdef_extensions = &_pdef_ext[0]; \
+	const unsigned int num_pdef_extensions = sizeof(_pdef_ext)/sizeof(_pdef_ext[0])
 
 /* Exported variables */
-extern ext_t *extensions;
-extern const unsigned int num_extensions;
+extern ext_t *def_extensions;
+extern const unsigned int num_def_extensions;
+extern ext_t *pdef_extensions;
+extern const unsigned int num_pdef_extensions;
 
+extern ext_t *extensions;
+extern unsigned int num_extensions;
 #endif /* EXT_H */
diff --git a/tools/cert_create/include/key.h b/tools/cert_create/include/key.h
index d96d983..128e7f7 100644
--- a/tools/cert_create/include/key.h
+++ b/tools/cert_create/include/key.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -73,11 +73,20 @@
 
 /* Macro to register the keys used in the CoT */
 #define REGISTER_KEYS(_keys) \
-	key_t *keys = &_keys[0]; \
-	const unsigned int num_keys = sizeof(_keys)/sizeof(_keys[0])
+	key_t *def_keys = &_keys[0]; \
+	const unsigned int num_def_keys = sizeof(_keys)/sizeof(_keys[0])
+
+/* Macro to register the platform defined keys used in the CoT */
+#define PLAT_REGISTER_KEYS(_pdef_keys) \
+	key_t *pdef_keys = &_pdef_keys[0]; \
+	const unsigned int num_pdef_keys = sizeof(_pdef_keys)/sizeof(_pdef_keys[0])
 
 /* Exported variables */
-extern key_t *keys;
-extern const unsigned int num_keys;
+extern key_t *def_keys;
+extern const unsigned int num_def_keys;
+extern key_t *pdef_keys;
+extern const unsigned int num_pdef_keys;
 
+extern key_t *keys;
+extern unsigned int num_keys;
 #endif /* KEY_H */