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Add a batch verifier to multiexp, along with constant time variants

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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.
This commit is contained in:
Luke Parker
2022-05-27 00:52:44 -04:00
parent c398b246ff
commit c90e957e6a
10 changed files with 161 additions and 98 deletions
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2
crypto/frost/Cargo.toml
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@@ -17,7 +17,7 @@ group = "0.11"
blake2 = "0.10"
transcript = { path = "../transcript" }
multiexp = { path = "../multiexp" }
multiexp = { path = "../multiexp", features = ["batch"] }
[dev-dependencies]
rand = "0.8"