[tor-relays] descriptor-id calc tool?

[nusenu]

>> The introduction points are not chosen by calculating the descriptor-id
>> and finding the 3 HSDirs next to it (by sorted fingerprint).
> 
> tldr: HSDir != IntroPoint.
> 
> Introduction points are chosen by random by an onion service and unknown 
> in advance. What is known in advance is only the onion address. Descriptor ID
> determines which HSDirs are responsible for storing corresponding descriptor.
> List of the current IntroPoints are embedded into descriptor (that's the
> reason we have descriptor thing in the first place).

Thanks for confirming!

(running an adhoc tor client in at 'info' log level was useful since it
outputs descriptor-id and actual hsdir it is contacting)

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