Just some minor observation:

There are various variants of memory functions in tfm core

• tfm_memory_utils.h  defines a set of identical functions
• tfm_core_utils.c/h has another set – functional equivalent with the C run-time library

Why are these functions duplicated?  It would be Ok if they address some additional security concerns (that I currently don’t understand). But todays implementation just add complexity.

Reinhard