Commit graph

54 commits

Author SHA1 Message Date
Luke Parker
1c98f15d5b
Make the cross-group DLEqProof prove constant time
Instead of having if statements for the bits, it now has constant time 
ops. While there are still if statements guiding the proof itself, they 
aren't dependent on the data within.
2022-07-01 15:27:16 -04:00
Luke Parker
4eafbe2a09
Unify the cross-group DLEq challenges
This does reduce the strength of the challenges to that of the weaker 
field, yet that doesn't have any impact on whether or not this is ZK due 
to the key being shared across fields.

Saves ~8kb.
2022-06-30 11:23:13 -04:00
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
5d115f1e1c
Implement a DLEq library
While Serai only needs the simple DLEq which was already present under 
monero, this migrates the implementation of the cross-group DLEq I 
maintain into Serai. This was to have full access to the ecosystem of 
libraries built under Serai while also ensuring support for it.

The cross_group curve, which is extremely experimental, is feature 
flagged off. So is the built in serialization functionality, as this 
should be possible to make nostd once const generics are full featured, 
yet the implemented serialization adds the additional barrier of 
std::io.
2022-06-30 05:42:29 -04:00