[curves] PAKE questions

Mike Hamburg mike at shiftleft.org
Mon Feb 9 00:02:57 PST 2015

On 2/7/2015 4:45 PM, Michael Hamburg wrote:
>> On Feb 7, 2015, at 4:30 PM, Brian Warner <warner at lothar.com> wrote:
>> On 2/7/15 2:21 PM, Michael Hamburg wrote:
>>> *Shameless plug*:
>>> If you’d like, I can get Decaf up and running on TwistEd25519 in
>>> Python. Decaf divides the cofactor by 4, and also conveniently
>>> implements a hash to the curve.
>> That'd be fun :).
> OK, I’ll see what I can do.
Actually this will take a while.  I'm pretty busy this week, but I was 
going to just cut and paste the code with different constants. I forgot 
something though: the twist of Curve25519 is a *twisted* Montgomery 
curve, and over a 1-mod-4 field that's actually a different thing (I 
think?  Other EC folks please correct me if I'm wrong).  The strategy 
still works but a bunch of the formulas need adjustment.

-- Mike

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