[tor-dev] New paper by Goldberg, Stebila, and Ustaoglu with proposed circuit handshake

Ian Goldberg iang at cs.uwaterloo.ca
Thu May 12 14:28:30 UTC 2011

On Thu, May 12, 2011 at 09:51:55AM -0400, Nick Mathewson wrote:
> On Thu, May 12, 2011 at 8:56 AM, Adam Langley <agl at imperialviolet.org> wrote:
> > On Thu, May 12, 2011 at 7:13 AM, Ian Goldberg <iang at cs.uwaterloo.ca> wrote:
> >> Nick, were you planning on using djb's qhasm code, or the C version
> >> (curve25519-donna)?  (A quick look at the latter suggests it's doing
> >> left-to-right, so some changes would still be required, but not evil
> >> assembly ones.
> >
> > donna is much faster than the reference implementation on 64-bit, but
> > much slower at 32-bit. The reference implementation was, indeed,
> > derived from a qhasm source, although I don't have it. (donna was only
> > intended to work on 64-bit systems, the 32-bit version is just for
> > completeness.)
> It's likely we'll want to use the fast reference implementation on
> 32-bit intel (It's assembly, right?), and donna on 64-bit platforms.
> We're going to need to find an answer for 32-bit PPC and ARM
> platforms, though.  Any suggestions there?

Does "the 32-bit version is just for completeness" mean there _is_ a
(slower?) 32-bit version in donna?  Or only for x86?

   - Ian

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