fix(wallet): locate self-sent notes by nullifier

lez/wallet/src/lib.rs

@@ -556,9 +556,16 @@ impl WalletCore {
             "Decode mask has {} entries but the transaction has {note_count} notes",
             acc_decode_mask.len(),
         );
-        for (output_index, acc_decode_data) in acc_decode_mask.iter().enumerate() {
+        for acc_decode_data in acc_decode_mask {
             match acc_decode_data {
                 AccDecodeData::Decode(secret, acc_account_id) => {
+                    let Some(output_index) = self
+                        .storage
+                        .key_chain()
+                        .locate_spend(*acc_account_id, &tx.message)
+                    else {
+                        continue;
+                    };
                     let acc_ead = tx.message.encrypted_private_post_states[output_index].clone();
 
                     let (kind, res_acc) = lee_core::EncryptionScheme::decrypt(

lez/wallet/src/storage/key_chain.rs

@@ -453,6 +453,21 @@ impl UserKeyChain {
         Some(new_nullifier)
     }
 
+    #[must_use]
+    pub fn locate_spend(&self, account_id: AccountId, message: &Message) -> Option<usize> {
+        let init = Nullifier::for_account_initialization(&account_id);
+        let update = self.private_account(account_id).map(|acc| {
+            Nullifier::for_account_update(
+                &Commitment::new(&account_id, acc.account),
+                &acc.key_chain.private_key_holder.nullifier_secret_key,
+            )
+        });
+        message
+            .new_nullifiers
+            .iter()
+            .position(|(nullifier, _)| *nullifier == init || Some(nullifier) == update.as_ref())
+    }
+
     pub fn add_imported_public_account(&mut self, private_key: lee::PrivateKey) {
         let account_id = AccountId::from(&lee::PublicKey::new_from_private_key(&private_key));