Add bch-mnemonic protocol

packages/stack/src/wallet/wallet-hd.ts

@@ -27,7 +27,11 @@ export type WalletHDGenesisData = {
   type: 'WalletHD';
   derivationPath: string;
   addressGap?: number;
-} & ({ seed: string } | { mnemonic: string } | { xpriv: string });
+} & (
+  | { seed: string }
+  | { mnemonic: string; passphrase?: string }
+  | { xpriv: string }
+);
 
 /**
  * A Hierarhical Determinstic (BIP44) Wallet.
@@ -111,9 +115,16 @@ export class WalletHD extends BaseWallet {
     if ('seed' in genesisData) {
       this.hdPrivateNode = HDPrivateNode.fromSeed(genesisData.seed);
     } else if ('mnemonic' in genesisData) {
-      this.hdPrivateNode = HDPrivateNode.fromMnemonic(
-        Mnemonic.fromPhrase(genesisData.mnemonic),
-      );
+      // TODO: We really want to support multiple word-lists somehow.
+      //       But this is not trivial because other word-lists are technically not standard.
+      //       For now, we are allowing any phrase (BIP39 derives seed from literal phrase, not word indexes).
+      const mnemonic = Mnemonic.fromRaw({
+        words: genesisData.mnemonic.split(' '),
+        passphrase: genesisData.passphrase,
+      });
+
+      // Create the HD Node from our Mnemonic instance.
+      this.hdPrivateNode = HDPrivateNode.fromMnemonic(mnemonic);
     } else {
       this.hdPrivateNode = HDPrivateNode.fromXPriv(genesisData.xpriv);
     }