Remove dependency on zcash-multisig

Cargo.toml

@@ -63,10 +63,6 @@ bech32 = "0.8.1"
 rand_chacha = "0.3.1"
 blake2b_simd = "0.5.11"
 
-[dependencies.zcash_multisig]
-git = "https://github.com/hhanh00/zcash-multisig.git"
-rev = "ce5baab5a25021950f51a9d53dc6c39ea9fe2997"
-
 # librustzcash synced to 35023ed8ca2fb1061e78fd740b640d4eefcc5edd
 
 [dependencies.zcash_client_backend]

src/wallet.rs

@@ -32,7 +32,6 @@ use zcash_primitives::memo::Memo;
 use zcash_primitives::transaction::builder::Progress;
 use zcash_primitives::transaction::components::Amount;
 use zcash_proofs::prover::LocalTxProver;
-use zcash_multisig::{SecretShare, split_account};
 use zcash_params::coin::TICKER;
 
 const DEFAULT_CHUNK_SIZE: u32 = 100_000;
@@ -136,6 +135,11 @@ impl Wallet {
         Ok(ivk)
     }
 
+    pub fn get_sk(&self, account: u32) -> anyhow::Result<String> {
+        let sk = self.db.get_sk(account)?;
+        Ok(sk)
+    }
+
     pub fn new_account_with_key(&self, name: &str, key: &str) -> anyhow::Result<i32> {
         let (seed, sk, ivk, pa) = decode_key(key)?;
         let account = self
@@ -531,14 +535,13 @@ impl Wallet {
         Ok(payment_json)
     }
 
-    pub fn store_share_secret(&self, account: u32, secret: &str) -> anyhow::Result<()> {
-        let share = SecretShare::decode(secret)?;
+    pub fn store_share_secret(&self, account: u32, secret: &str, index: usize, threshold: usize, participants: usize) -> anyhow::Result<()> {
         self.db.store_share_secret(
             account,
             secret,
-            share.index,
-            share.threshold,
-            share.participants,
+            index,
+            threshold,
+            participants,
         )
     }
 
@@ -546,19 +549,6 @@ impl Wallet {
         self.db.get_share_secret(account)
     }
 
-    pub fn split_account(&self, t: usize, n: usize, account: u32) -> anyhow::Result<String> {
-        let sk = self.db.get_sk(account)?;
-        let esk = decode_extended_spending_key(NETWORK.hrp_sapling_extended_spending_key(), &sk)
-            .unwrap()
-            .unwrap();
-        let secret_key = esk.expsk.ask;
-        let nsk = esk.expsk.nsk;
-        let shares = split_account(t, n, secret_key, nsk)?;
-        let shares: Vec<_> = shares.iter().map(|s| s.encode().unwrap()).collect();
-        let res = shares.join("|");
-        Ok(res)
-    }
-
     pub fn parse_recipients(recipients: &str) -> anyhow::Result<Vec<RecipientMemo>> {
         let recipients: Vec<Recipient> = serde_json::from_str(recipients)?;
         let recipient_memos: Vec<_> = recipients.iter().map(|r| RecipientMemo::from(r)).collect();