PSA_KEY_LIFETIME_PERSISTENT macro
The default lifetime for persistent keys. A persistent key remains in storage until it is explicitly destroyed or until the corresponding storage area is wiped. This specification does not define any mechanism to wipe a storage area, but integrations may provide their own mechanism (for example to perform a factory reset, to prepare for device refurbishment, or to uninstall an application). This lifetime value is the default storage area for the calling application. Integrations of Mbed TLS may support other persistent lifetimes. See ::psa_key_lifetime_t for more information.