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Smash the singular Ciphersuite trait into multiple

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This helps identify where the various functionalities are used, or rather, not
used. The `Ciphersuite` trait present in `patches/ciphersuite`, facilitating
the entire FCMP++ tree, only requires the markers _and_ canonical point
decoding. I've opened a PR to upstream such a trait into `group`
(https://github.com/zkcrypto/group/pull/68).

`WrappedGroup` is still justified for as long as `Group::generator` exists.
Moving `::generator()` to its own trait, on an independent structure (upstream)
would be massively appreciated. @tarcieri also wanted to update from
`fn generator()` to `const GENERATOR`, which would encourage further discussion
on https://github.com/zkcrypto/group/issues/32 and
https://github.com/zkcrypto/group/issues/45, which have been stagnant.

The `Id` trait is occasionally used yet really should be first off the chopping
block.

Finally, `WithPreferredHash` is only actually used around a third of the time,
which more than justifies it being a separate trait.

---

Updates `dalek_ff_group::Scalar` to directly re-export
`curve25519_dalek::Scalar`, as without issue. `dalek_ff_group::RistrettoPoint`
also could be replaced with an export of `curve25519_dalek::RistrettoPoint`,
yet the coordinator relies on how we implemented `Hash` on it for the hell of
it so it isn't worth it at this time. `dalek_ff_group::EdwardsPoint` can't be
replaced for an re-export of `curve25519_dalek::SubgroupPoint` as it doesn't
implement `zeroize`, `subtle` traits within a released, non-yanked version.
Relevance to https://github.com/serai-dex/serai/issues/201 and
https://github.com/dalek-cryptography/curve25519-dalek/issues/811#issuecomment-3247732746.

Also updates the `Ristretto` ciphersuite to prefer `Blake2b-512` over
`SHA2-512`. In order to maintain compliance with FROST's IETF standard,
`modular-frost` defines its own ciphersuite for Ristretto which still uses
`SHA2-512`.
This commit is contained in:
Luke Parker
2025-09-03 12:25:37 -04:00
parent 215e41fdb6
commit a141deaf36
124 changed files with 1003 additions and 1211 deletions
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15
substrate/client/tests/common/validator_sets.rs
View File

@@ -1,9 +1,13 @@
use std::collections::HashMap;
use serai_abi::primitives::NetworkId;
use zeroize::Zeroizing;
use rand_core::OsRng;
use frost::curve::Ristretto;
use ciphersuite::{WrappedGroup, GroupIo};
use dkg_musig::musig;
use schnorrkel::Schnorrkel;
use sp_core::{
ConstU32,
bounded_vec::BoundedVec,
@@ -11,10 +15,7 @@ use sp_core::{
Pair as PairTrait,
};
use dalek_ff_group::Ristretto;
use ciphersuite::Ciphersuite;
use dkg_musig::musig;
use schnorrkel::Schnorrkel;
use serai_abi::primitives::NetworkId;
use serai_client::{
primitives::{EmbeddedEllipticCurve, Amount},
@@ -37,13 +38,13 @@ pub async fn set_keys(
let mut pub_keys = vec![];
for pair in pairs {
let public_key =
<Ristretto as Ciphersuite>::read_G::<&[u8]>(&mut pair.public().0.as_ref()).unwrap();
<Ristretto as GroupIo>::read_G::<&[u8]>(&mut pair.public().0.as_ref()).unwrap();
pub_keys.push(public_key);
}
let mut threshold_keys = vec![];
for i in 0 .. pairs.len() {
let secret_key = <Ristretto as Ciphersuite>::read_F::<&[u8]>(
let secret_key = <Ristretto as GroupIo>::read_F::<&[u8]>(
&mut pairs[i].as_ref().secret.to_bytes()[.. 32].as_ref(),
)
.unwrap();