Try using buffers

index.js

@@ -1,9 +1,22 @@
 // const sha3 = require('js-sha3').sha3_256
-const sha3 = require('js-sha3').shake_256
+const sha3 = require('js-sha3').keccak_256
 const uts46 = require('idna-uts46')
 // const SHA3 = require('crypto-js/sha3')
 
 module.exports = function namehash (inputName) {
+
+  let node = new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex')
+  if(inputName && inputName !== '') {
+    let name = normalize(inputName)
+    var labels = name.split('.')
+    for(var i = labels.length - 1; i >= 0; i--) {
+      const combined = new Buffer([node, sha3(labels[i])])
+      node = sha3(combined)
+    }
+  }
+  return '0x' + node.toString('hex')
+
+
   console.log('called with ' + inputName)
 
   // Reject empty names:
@@ -15,7 +28,7 @@ module.exports = function namehash (inputName) {
     return result
   }
 
-  const name = normalize(inputName)
+  name = normalize(inputName)
   const split = name.split('.')
 
   const label = split.shift()
@@ -35,5 +48,5 @@ function sha3 (input) {
 */
 
 function normalize(name) {
-  return uts46.toUnicode(name, {useStd3ASCII: true, transitional: false});
+  return uts46.toUnicode(name, {useStd3ASCII: true, transitional: false})
 }

test/index.js

@@ -7,15 +7,22 @@ const namehash = require('../')
 test('empty name', (t) => {
   t.plan(1)
   const input = ''
-  const expected = '0000000000000000000000000000000000000000000000000000000000000000'
+  const expected = '0x0000000000000000000000000000000000000000000000000000000000000000'
   const output = namehash(input)
   t.equal(output, expected)
 })
 
+test('empty param', (t) => {
+  t.plan(1)
+  const expected = '0x0000000000000000000000000000000000000000000000000000000000000000'
+  const output = namehash()
+  t.equal(output, expected)
+})
+
 test('TLD eth', (t) => {
   t.plan(1)
   const input = 'eth'
-  const expected = '93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae'
+  const expected = '0x93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae'
   const output = namehash(input)
   t.equal(output, expected)
 })
@@ -23,7 +30,7 @@ test('TLD eth', (t) => {
 test('foo.eth', (t) => {
   t.plan(1)
   const input = 'foo.eth'
-  const expected = 'de9b09fd7c5f901e23a3f19fecc54828e9c848539801e86591bd9801b019f84f'
+  const expected = '0xde9b09fd7c5f901e23a3f19fecc54828e9c848539801e86591bd9801b019f84f'
   const output = namehash(input)
   t.equal(output, expected)
 })