Added functionality to sign message

CHANGELOG.md

@@ -5,4 +5,5 @@
 - Implemented Keyring functionality to enable account generation and export keys
 - Added getAccounts() method to fetch list of generated accounts
 - Added importWallet() to import account using privateKey
-- Added initial test
+- Added initial test
+- Added functionality to sign message

package.json

@@ -22,6 +22,7 @@
     "ed25519-hd-key": "^1.3.0",
     "mocha": "^10.7.0",
     "nyc": "^17.0.0",
-    "obs-store": "^4.0.3"
+    "obs-store": "^4.0.3",
+    "tweetnacl": "^1.0.3"
   }
 }

src/index.js

@@ -1,6 +1,7 @@
 const ObservableStore = require("obs-store");
 const bs58 = require("bs58");
 const helper = require("./helper");
+const nacl = require('tweetnacl');
 
 
 const { solana: { HD_PATH }, solana_connection: { MAINNET }} = require('./config')
@@ -55,6 +56,19 @@ class KeyringController {
     }
   }
 
+  async signMessage(message, _address) {
+    const { mnemonic, address } = this.store.getState()
+    const idx = address.indexOf(_address);
+
+    if (idx < 0)
+      throw "Invalid address, the address is not available in the wallet"
+
+    const accountDetails = helper.setupAccount(mnemonic, helper.getHDPath(idx))
+    const msg = Buffer.from(message)
+
+    return { signedMessage: bs58.encode(nacl.sign.detached(msg, accountDetails.secretKey)) };
+  }
+
   persistAllAddress(_address) {
     const { address } = this.store.getState();
     let newAdd = address;