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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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8
processor/bitcoin/src/scheduler.rs
View File

@@ -1,6 +1,6 @@
use core::future::Future;
use ciphersuite::Ciphersuite;
use ciphersuite::*;
use ciphersuite_kp256::Secp256k1;
use bitcoin_serai::{
@@ -26,8 +26,8 @@ use crate::{
rpc::Rpc,
};
fn address_from_serai_key(key: <Secp256k1 as Ciphersuite>::G, kind: OutputType) -> Address {
let offset = <Secp256k1 as Ciphersuite>::G::GENERATOR * offsets_for_key(key)[&kind];
fn address_from_serai_key(key: <Secp256k1 as WrappedGroup>::G, kind: OutputType) -> Address {
let offset = <Secp256k1 as WrappedGroup>::G::GENERATOR * offsets_for_key(key)[&kind];
Address::new(
p2tr_script_buf(key + offset)
.expect("creating address from Serai key which wasn't properly tweaked"),
@@ -72,7 +72,7 @@ fn signable_transaction<D: Db>(
*/
payments.push((
// The generator is even so this is valid
p2tr_script_buf(<Secp256k1 as Ciphersuite>::G::GENERATOR).unwrap(),
p2tr_script_buf(<Secp256k1 as WrappedGroup>::G::GENERATOR).unwrap(),
// This uses the minimum output value allowed, as defined as a constant in bitcoin-serai
// TODO: Add a test for this comparing to bitcoin's `minimal_non_dust`
bitcoin_serai::wallet::DUST,