Move additional_key.rs to serai-processor-view-keys

I don't love this. I wanted to simply add this function to `processor/key-gen`,
but then anyone who wants a view key needs to pull in Bulletproofs which is a
mess of code. They'd also be subject to an AGPL licensed library.

This is so small it should be a primitive elsewhere, yet there is no primitives
library eligible. Maybe serai-client since that has the code to make
transactions to Serai (and will have this as a dependency)? Except then the
processor has to import serai-client when this rewrite removed it as a
dependency.

processor/src/additional_key.rs

@@ -1,14 +0,0 @@
-use ciphersuite::Ciphersuite;
-
-use crate::networks::Network;
-
-// Generate a static additional key for a given chain in a globally consistent manner
-// Doesn't consider the current group key to increase the simplicity of verifying Serai's status
-// Takes an index, k, to support protocols which use multiple secondary keys
-// Presumably a view key
-pub fn additional_key<N: Network>(k: u64) -> <N::Curve as Ciphersuite>::F {
-  <N::Curve as Ciphersuite>::hash_to_F(
-    b"Serai DEX Additional Key",
-    &[N::ID.as_bytes(), &k.to_le_bytes()].concat(),
-  )
-}

processor/src/lib.rs

@@ -1,15 +0,0 @@
-#![allow(dead_code)]
-
-mod plan;
-pub use plan::*;
-
-mod db;
-pub(crate) use db::*;
-
-use serai_processor_key_gen as key_gen;
-
-pub mod networks;
-pub(crate) mod multisigs;
-
-mod additional_key;
-pub use additional_key::additional_key;

processor/src/main.rs

@@ -27,9 +27,6 @@ use serai_env as env;
 
 use message_queue::{Service, client::MessageQueue};
 
-mod plan;
-pub use plan::*;
-
 mod networks;
 use networks::{Block, Network};
 #[cfg(feature = "bitcoin")]
@@ -39,9 +36,6 @@ use networks::Ethereum;
 #[cfg(feature = "monero")]
 use networks::Monero;
 
-mod additional_key;
-pub use additional_key::additional_key;
-
 mod db;
 pub use db::*;
 

processor/src/multisigs/mod.rs

@@ -4,5 +4,5 @@ pub enum MultisigEvent<N: Network> {
   // Batches to publish
   Batches(Option<(<N::Curve as Ciphersuite>::G, <N::Curve as Ciphersuite>::G)>, Vec<Batch>),
   // Eventuality completion found on-chain
-  Completed(Vec<u8>, [u8; 32], <N::Eventu
+  Completed(Vec<u8>, [u8; 32], N::Eventuality),
 }