Messages in this thread | | | Subject | Re: [PATCH v4 12/13] bluetooth/smp: ensure RNG is properly seeded before ECDH use | From | Marcel Holtmann <> | Date | Thu, 8 Jun 2017 19:05:25 +0200 |
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Hi Jason,
>> yes, there are plenty of commands needed before a controller becomes usable. > > That doesn't clearly address with precision what Ted was wondering. > Specifically, the inquiry is: can you confirm with certainty whether > or not all calls to get_random_bytes() in the bluetooth directory are > *necessarily* going to come after a call to hci_power_on()?
on a powered down controller, you can not do any crypto. SMP is only during a connection and the RPAs are only generated when needed. So yes, doing this once in hci_power_on is plenty. However we might want to limit this to LE capable controllers since for BR/EDR only controllers this is not needed. For A2MP I need to check that we need the random numbers seeded there. However this hidden behind the high speed feature.
Regards
Marcel
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