[tor-dev] Accessing Shared Random Values as a Protocol on top of Tor

David Goulet dgoulet at torproject.org
Tue Dec 7 14:25:07 UTC 2021

On 29 Oct (23:56:07), Sebastian Hoffmann wrote:
> Hi,
> I'm wondering if I can access the shared random value[1] while
> developing a
> protocol/application on top of Tor onion services. The application is
> still in
> early development, but it would be great if I could depend on the shared
> random
> value.
> If this is not the correct mailing list for this question, I would be
> glad if
> you could point me to one.

You can through the ControlPort with:

  "GETINFO sr/current"
  "GETINFO sr/previous"

From control-spec.txt:

      The current or previous shared random value, as received in the    
      consensus, base-64 encoded.  An empty value means that either   
      the consensus has no shared random value, or Tor has no consensus. 


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