NXP Semiconductors

A5000

EdgeLock Secure Authenticator

3.2.7 Credential Storage & Memory

Within A5000, all credentials and secure objects are stored inside a dynamic file structure. At creation, a user

has to associate a file identifier with the object created. This identifier is then used in subsequent operations to

access the object. The number of objects that can be allocated is only limited by the available memory in the

system. After usage, objects can be deleted and the associated memory is freed up again.

There is also the possibility to create transient objects. Transient objects have an object descriptor stored in

non-volatile memory, but the object content is stored in RAM. Together with the import/export functionality of

A5000, transient objects can be used securely store secret keys in a remote memory system.

When the creation of secure objects is interrupted by internal errors (e.g. insufficient space) or a tearing event,

the memory is not freed up automatically. The memory can be freed up using garbage collection. An example to

trigger garbage collection is included in the Plug & Trust Middleware (InvokeGarbageCollection) [5].

3.3 Startup behavior

If a supply voltage is applied to pins VIN, VCC within the specified supply voltage operating range the IC boots

up.

A5000

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Product data sheet

Rev. 1.5 — 8 July 2024

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