From aj at erisian.com.au  Mon Oct  5 15:02:10 2015
From: aj at erisian.com.au (Anthony Towns)
Date: Tue, 6 Oct 2015 01:02:10 +1000
Subject: [Lightning-dev] Onion routing strawman proposal
In-Reply-To: <20151004055717.GA14108@navy>
References: <877fn5om6g.fsf@rustcorp.com.au> <20151003163855.GA22873@navy>
	<20151004055717.GA14108@navy>
Message-ID: <20151005150210.GA27201@navy>

On Sun, Oct 04, 2015 at 03:57:17PM +1000, Anthony Towns wrote:
> On Sun, Oct 04, 2015 at 02:38:56AM +1000, Anthony Towns wrote:
> > Sigh. I've had a go at reimplementing it in python, but ...
> But nothing! The decoding/forwarding is successfully working in python
> with pyelliptic. (I'm running the HMAC twice rather than actually working
> out y)
> $ test/test_onion 15 > TEST.OUT
> $ python test/test_onion.py < TEST.OUT
> Message to 0
> Message to 1

Okay, and now the python version does creation as well, though I haven't
checked if the C version can decode it:

$ ./test/test_onion 3 | python test/test_onion.py
Message to 0
Message to 1
Message to 2
done

$ python test/test_onion.py generate 3 | python test/test_onion.py
Howzit 0...
Howzit 1...
Howzit 2...
done

$ wc test/test_onion.{c,py} -l
  684 test/test_onion.c
  329 test/test_onion.py

(though about 1/3 of the python lines are just implementing "determine
y given x" and "ecdh with y as well as x", bleh. It also doesn't have
the "export-friendly encryption" mode implemented ;)

> Eh, I made it a pull request; those are fun right?
> https://github.com/ElementsProject/lightning/pull/8

(This is updated correspondingly)

Cheers,
aj