Commit graph

5 commits

Author SHA1 Message Date
Luke Parker
7890827a48
Implement variable-sized windows into multiexp
Closes https://github.com/serai-dex/serai/issues/17 by using the 
PrimeFieldBits API to do so.

Should greatly speed up small batches, along with batches in the 
hundreds. Saves almost a full second on the cross-group DLEq proof.
2022-06-30 09:30:24 -04:00
Luke Parker
5da1b4fcf8
Prepare multiexp for publishing 2022-06-19 06:35:45 -04:00
Luke Parker
e0ce6e5c12
Add Ed25519 to FROST and remove expand_xmd for elliptic_curve's
Doesn't fully utilize ec's hash2curve module as k256 Scalar doesn't have 
FromOkm for some reason. The previously present bigint reduction is 
preserved.

Updates ff/group to 0.12.

Premised on https://github.com/cfrg/draft-irtf-cfrg-frost/pull/205 being 
merged, as while this Ed25519 is vector compliant, it's technically not 
spec compliant due to that conflict.
2022-06-06 02:18:25 -04:00
Luke Parker
c90e957e6a
Add a batch verifier to multiexp, along with constant time variants
Saves ~8% during FROST key gen, even with dropping a vartime for a 
constant time (as needed to be secure), as the new batch verifier is 
used where batch verification previously wasn't. The new multiexp API 
itself also offered a very slight performance boost, which may solely be 
a measurement error.

Handles most of https://github.com/serai-dex/serai/issues/10. The blame 
function isn't binary searched nor randomly sorted yet.
2022-05-27 00:52:44 -04:00
Luke Parker
56fc39fff5
Fix https://github.com/serai-dex/serai/issues/5 2022-05-03 07:42:09 -04:00