feat(event-handler): add .sign() and .verify() methods

Author: gr2m

event-handler/index.js

@@ -1,8 +1,10 @@
 module.exports = createEventHandler
 
 const on = require('./on')
-const removeListener = require('./remove-listener')
 const receive = require('./receive')
+const removeListener = require('./remove-listener')
+const sign = require('../sign')
+const verify = require('../verify')
 
 function createEventHandler (options) {
   if (!options || !options.secret) {
@@ -15,6 +17,8 @@ function createEventHandler (options) {
   }
 
   return {
+    sign: sign.bind(null, state.secret),
+    verify: verify.bind(null, state.secret),
     on: on.bind(null, state),
     removeListener: removeListener.bind(null, state),
     receive: receive.bind(null, state)