.. zephyr:code-sample:: psa_its
:name: PSA Internal Trusted Storage API
:relevant-api: psa_secure_storage
Use the PSA ITS API.
Overview
********
This sample demonstrates usage of the
`PSA Internal Trusted Storage (ITS) API <https://arm-software.github.io/psa-api/storage/1.0/overview/architecture.html#the-internal-trusted-storage-api>`_,
which is part of the `PSA Secure Storage API <https://arm-software.github.io/psa-api/storage/>`_,
for storing and retrieving persistent data.
Requirements
************
An implementation of the PSA ITS API must be present for this sample to build.
It can be provided by:
* :ref:`tfm`, for ``*/ns`` :term:`board targets<board target>`.
* The :ref:`secure storage subsystem <secure_storage>`, for the other board targets.
Building
********
This sample is located in :zephyr_file:`samples/psa/its`.
Different configurations are defined in the :file:`sample.yaml` file.
You can use them to build the sample, depending on the PSA ITS provider, as follows:
.. tabs::
.. tab:: TF-M
For board targets with TF-M:
.. zephyr-app-commands::
:zephyr-app: samples/psa/its
:tool: west
:goals: build
:board: <ns_board_target>
:west-args: -T sample.psa.its.tfm
.. tab:: secure storage subsystem
For board targets without TF-M.
If the board target to compile for has an entropy driver (preferable):
.. zephyr-app-commands::
:zephyr-app: samples/psa/its
:tool: west
:goals: build
:board: <board_target>
:west-args: -T sample.psa.its.secure_storage.entropy_driver
Or, to use an insecure entropy source (only for testing):
.. zephyr-app-commands::
:zephyr-app: samples/psa/its
:tool: west
:goals: build
:board: <board_target>
:west-args: -T sample.psa.its.secure_storage.entropy_not_secure
To flash it, see :ref:`west-flashing`.
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