Smash the singular Ciphersuite trait into multiple

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`.

processor/ethereum/src/key_gen.rs

@@ -1,4 +1,4 @@
-use ciphersuite::Ciphersuite;
+use ciphersuite::*;
 use dkg::{ThresholdKeys, Curves, Secp256k1};
 
 use ethereum_schnorr::PublicKey;
@@ -13,19 +13,19 @@ impl key_gen::KeyGenParams for KeyGenParams {
     keys: &mut ThresholdKeys<<Self::ExternalNetworkCiphersuite as Curves>::ToweringCurve>,
   ) {
     while PublicKey::new(keys.group_key()).is_none() {
-      *keys = keys.clone().offset(<<Secp256k1 as Curves>::ToweringCurve as Ciphersuite>::F::ONE);
+      *keys = keys.clone().offset(<<Secp256k1 as Curves>::ToweringCurve as WrappedGroup>::F::ONE);
     }
   }
 
   fn encode_key(
-    key: <<Self::ExternalNetworkCiphersuite as Curves>::ToweringCurve as Ciphersuite>::G,
+    key: <<Self::ExternalNetworkCiphersuite as Curves>::ToweringCurve as WrappedGroup>::G,
   ) -> Vec<u8> {
     PublicKey::new(key).unwrap().eth_repr().to_vec()
   }
 
   fn decode_key(
     key: &[u8],
-  ) -> Option<<<Self::ExternalNetworkCiphersuite as Curves>::ToweringCurve as Ciphersuite>::G> {
+  ) -> Option<<<Self::ExternalNetworkCiphersuite as Curves>::ToweringCurve as WrappedGroup>::G> {
     PublicKey::from_eth_repr(key.try_into().ok()?).map(|key| key.point())
   }
 }

processor/ethereum/src/primitives/block.rs

@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use ciphersuite::Ciphersuite;
+use ciphersuite::*;
 use ciphersuite_kp256::Secp256k1;
 
 use serai_client::networks::ethereum::Address;
@@ -41,7 +41,7 @@ pub(crate) struct FullEpoch {
 impl primitives::Block for FullEpoch {
   type Header = Epoch;
 
-  type Key = <Secp256k1 as Ciphersuite>::G;
+  type Key = <Secp256k1 as WrappedGroup>::G;
   type Address = Address;
   type Output = Output;
   type Eventuality = Eventuality;

processor/ethereum/src/primitives/machine.rs

@@ -2,7 +2,7 @@ use std::{io, collections::HashMap};
 
 use rand_core::{RngCore, CryptoRng};
 
-use ciphersuite::Ciphersuite;
+use ciphersuite::*;
 use ciphersuite_kp256::Secp256k1;
 use frost::{
   dkg::{Participant, ThresholdKeys},
@@ -24,10 +24,10 @@ pub struct EthereumHram;
 impl Hram<Secp256k1> for EthereumHram {
   #[allow(non_snake_case)]
   fn hram(
-    R: &<Secp256k1 as Ciphersuite>::G,
-    A: &<Secp256k1 as Ciphersuite>::G,
+    R: &<Secp256k1 as WrappedGroup>::G,
+    A: &<Secp256k1 as WrappedGroup>::G,
     m: &[u8],
-  ) -> <Secp256k1 as Ciphersuite>::F {
+  ) -> <Secp256k1 as WrappedGroup>::F {
     Signature::challenge(*R, &PublicKey::new(*A).unwrap(), m)
   }
 }

processor/ethereum/src/primitives/output.rs

@@ -1,6 +1,6 @@
 use std::io;
 
-use ciphersuite::{group::GroupEncoding, Ciphersuite};
+use ciphersuite::{group::GroupEncoding, *};
 use ciphersuite_kp256::Secp256k1;
 
 use alloy_core::primitives::U256;
@@ -61,10 +61,10 @@ impl AsMut<[u8]> for OutputId {
 
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub(crate) enum Output {
-  Output { key: <Secp256k1 as Ciphersuite>::G, instruction: EthereumInInstruction },
-  Eventuality { key: <Secp256k1 as Ciphersuite>::G, nonce: u64 },
+  Output { key: <Secp256k1 as WrappedGroup>::G, instruction: EthereumInInstruction },
+  Eventuality { key: <Secp256k1 as WrappedGroup>::G, nonce: u64 },
 }
-impl ReceivedOutput<<Secp256k1 as Ciphersuite>::G, Address> for Output {
+impl ReceivedOutput<<Secp256k1 as WrappedGroup>::G, Address> for Output {
   type Id = OutputId;
   type TransactionId = [u8; 32];
 
@@ -107,7 +107,7 @@ impl ReceivedOutput<<Secp256k1 as Ciphersuite>::G, Address> for Output {
     }
   }
 
-  fn key(&self) -> <Secp256k1 as Ciphersuite>::G {
+  fn key(&self) -> <Secp256k1 as WrappedGroup>::G {
     match self {
       Output::Output { key, .. } | Output::Eventuality { key, .. } => *key,
     }