[TF-M] Intended use of psa_reset_key_attributes()

Hi,

What was the intended usage of psa_reset_key_attribute(*attributes) which requires a PSA call from non-secure side to reset the client attributes? I am curious because the attributes to be reset comes from the non-secure memory, not directly associated with ITS/PS.

The current IPC setup performs a PSA call to tfm_crypto_rest_key_attributes()(https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/secure_fw/p...) This function creates a copy of client key attribute in a secure key attribute structure. The secure key attribute is reset (set to 0) and then copied back to the client key attribute before returning to non-secure code. At first glance, this seems like a roundabout way to zeorise client side attributes.

Regards, Archanaa