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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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2
crypto/frost/src/tests/literal/ed448.rs
View File

@@ -1,6 +1,6 @@
use rand_core::OsRng;
use ciphersuite::Ciphersuite;
use ciphersuite::GroupIo;
use schnorr::SchnorrSignature;

4
crypto/frost/src/tests/mod.rs
View File

@@ -2,7 +2,7 @@ use std::collections::HashMap;
use rand_core::{RngCore, CryptoRng};
use ciphersuite::Ciphersuite;
use ciphersuite::{GroupIo, Id};
pub use dkg_recovery::recover_key;
use crate::{
@@ -28,7 +28,7 @@ pub const PARTICIPANTS: u16 = 5;
pub const THRESHOLD: u16 = ((PARTICIPANTS * 2) / 3) + 1;
/// Create a key, for testing purposes.
pub fn key_gen<R: RngCore + CryptoRng, C: Ciphersuite>(
pub fn key_gen<R: RngCore + CryptoRng, C: GroupIo + Id>(
rng: &mut R,
) -> HashMap<Participant, ThresholdKeys<C>> {
let res = dkg_dealer::key_gen::<R, C>(rng, THRESHOLD, PARTICIPANTS).unwrap();