Key Dependent Signer Function APIs

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 ### Added
+- [\#319](https://github.com/Manta-Network/manta-rs/pull/319) Key-dependent signer function APIs.
 - [\#314](https://github.com/Manta-Network/manta-rs/pull/314) Prepares the signer export to wasm.
 - [\#289](https://github.com/Manta-Network/manta-rs/pull/289) AssetMetadata upgrade and NFT support.
 - [\#310](https://github.com/Manta-Network/manta-rs/pull/310) Add identity verification algorithm using ToPublic circuit

manta-accounting/src/transfer/utxo/protocol.rs

@@ -2256,6 +2256,13 @@ where
     }
 }
 
+impl<C> cmp::Eq for AuthorizationContext<C>
+where
+    C: BaseConfiguration<Bool = bool>,
+    C::Group: cmp::PartialEq,
+{
+}
+
 impl<C, COM> Variable<Secret, COM> for AuthorizationContext<C, COM>
 where
     COM: Has<bool, Type = C::Bool>,

manta-accounting/src/wallet/mod.rs

@@ -344,6 +344,9 @@ where
                     InconsistencyError::SignerSynchronization,
                 ))
             }
+            Err(SyncError::MissingProofAuthorizationKey) => {
+                Err(Error::MissingProofAuthorizationKey)
+            }
         }
     }
 
@@ -454,7 +457,7 @@ where
 
     /// Returns the address.
     #[inline]
-    pub async fn address(&mut self) -> Result<Address<C>, S::Error> {
+    pub async fn address(&mut self) -> Result<Option<Address<C>>, S::Error> {
         self.signer.address().await
     }
 
@@ -577,6 +580,12 @@ where
 
     /// Ledger Connection Error
     LedgerConnectionError(L::Error),
+
+    /// Missing Spending Key Error
+    MissingSpendingKey,
+
+    /// Missing Proof Authorization Key Error
+    MissingProofAuthorizationKey,
 }
 
 impl<C, L, S> From<InconsistencyError> for Error<C, L, S>

manta-accounting/src/wallet/signer/functions.rs

@@ -71,7 +71,7 @@ where
 
 /// Returns the default authorization context for `accounts`.
 #[inline]
-fn default_authorization_context<C>(
+pub fn default_authorization_context<C>(
     accounts: &AccountTable<C>,
     parameters: &C::Parameters,
 ) -> AuthorizationContext<C>
@@ -198,7 +198,7 @@ where
 #[allow(clippy::too_many_arguments)]
 #[inline]
 fn sync_with<C, I>(
-    accounts: &AccountTable<C>,
+    authorization_context: &mut AuthorizationContext<C>,
     assets: &mut C::AssetMap,
     checkpoint: &mut C::Checkpoint,
     utxo_accumulator: &mut C::UtxoAccumulator,
@@ -215,13 +215,12 @@ where
     let nullifier_count = nullifiers.len();
     let mut deposit = Vec::new();
     let mut withdraw = Vec::new();
-    let mut authorization_context = default_authorization_context::<C>(accounts, parameters);
-    let decryption_key = parameters.derive_decryption_key(&mut authorization_context);
+    let decryption_key = parameters.derive_decryption_key(authorization_context);
     for (utxo, note) in inserts {
         if let Some((identifier, asset)) = parameters.open_with_check(&decryption_key, &utxo, note)
         {
             insert_next_item::<C>(
-                &mut authorization_context,
+                authorization_context,
                 utxo_accumulator,
                 assets,
                 parameters,
@@ -238,7 +237,7 @@ where
     assets.retain(|identifier, assets| {
         assets.retain(|asset| {
             is_asset_unspent::<C>(
-                &mut authorization_context,
+                authorization_context,
                 utxo_accumulator,
                 parameters,
                 identifier.clone(),
@@ -604,7 +603,7 @@ where
 #[inline]
 pub fn sync<C>(
     parameters: &SignerParameters<C>,
-    accounts: &AccountTable<C>,
+    authorization_context: &mut AuthorizationContext<C>,
     assets: &mut C::AssetMap,
     checkpoint: &mut C::Checkpoint,
     utxo_accumulator: &mut C::UtxoAccumulator,
@@ -633,7 +632,7 @@ where
             nullifier_data,
         } = request.data;
         let response = sync_with::<C, _>(
-            accounts,
+            authorization_context,
             assets,
             checkpoint,
             utxo_accumulator,