STORAGE_ENCRYPTION_BINDING_SEED
What it is
External encryption binding seed.
This value is mixed with the local key storage encryption key. This property holds 16 bytes, and is expected to be persisted on an ECU separate from the IVI. The property is initially set by AAOS, who generates it using a CSRNG. AAOS will then read the property on subsequent boots. The binding seed is expected to be reliably persisted. Any loss of the seed results in a factory reset of the IVI.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11700607 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00700000 | BYTES |
| Ordinal | 0x0000ffff | 0x00000607 | 0x607 |
Reading it from an app
This property is defined in the HAL but is not exposed as a constant in android.car.VehiclePropertyIds, so it is not reachable through CarPropertyManager from an ordinary app. It is used by the platform, or by vendor code running with system privileges.