feat: change db implementation for strings

src/wallet/db/level/db.ts

@@ -39,24 +39,24 @@ export class WalletDB implements DbInterface {
         await this.db.put(wdb.V, version.toString());
     }
 
-    public async getMasterKey(): Promise<{
-        privateKey: Buffer;
+    public async getEncryptedMasterKey(): Promise<{
+        encryptedKey: string;
         chaincode: Buffer;
     }> {
         const masterKey = await this.db.get(wdb.M);
-        const privateKey = Buffer.from(masterKey.slice(0, 64), 'hex');
-        const chaincode = Buffer.from(masterKey.slice(64), 'hex');
+        const [chainCodeHex, encryptedKey] = masterKey.split(':');
+        const chaincode = Buffer.from(chainCodeHex, 'hex');
 
-        return { privateKey, chaincode };
+        return { encryptedKey, chaincode };
     }
 
-    public async setMasterKey(
-        privateKey: Buffer,
+    public async setEncryptedMasterKey(
+        encryptedKey: string,
         chaincode: Buffer,
     ): Promise<void> {
         await this.db.put(
             wdb.M,
-            Buffer.concat([privateKey, chaincode]).toString('hex'),
+            `${chaincode.toString('hex')}:${encryptedKey}`,
         );
     }