With AES-GCM, AES-CCM, ChaCha20-Poly1305 you don’t need a PRNG at all.

With AES-CBC you need an unpredictable IV, but you could generate them by 
encrypting a counter with one AES key (that could be provided by the controller)

But you still need the TLS session.

> On 18 Jul 2017, at 17:34, Yaron Sheffer <[email protected]> wrote:
> 
> On 18/07/17 17:14, Yoav Nir wrote:
>> I mostly agree, but one point…
>> 
>>> On 18 Jul 2017, at 17:06, Tero Kivinen <[email protected]> wrote:
>> <snip/>
>> 
>>> This I think is important question, i.e., what is the gain for not
>>> running IKEv2 between the nodes?
>>> 
>> Simpler gateway, less code, no PK operations, no need for random number 
>> generator.
>> 
>> The counter-argument is that without all these you can’t setup a TLS session 
>> to run netconf over.
>> 
>> Yoav
>> 
> No random number generator? I don't think this is true even for a pure ESP 
> endpoint.
> 
> Thanks,
>    Yaron

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