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When registering a key in a secure element, go through the transaction mechanism. This makes the code simpler, at the expense of a few extra storage operations. Given that registering a key is typically very rare over the lifetime of a device, this is an acceptable loss. Drivers must now have a p_validate_slot_number method, otherwise registering a key is not possible. This reduces the risk that due to a mistake during the integration of a device, an application might claim a slot in a way that is not supported by the driver.