Remove crypto-js

package.json

@@ -68,15 +68,10 @@
     "test": "npm run-script unit",
     "unit": "istanbul test mocha -- --reporter list test/*.js"
   },
-  "browser": {
-    "crypto": "crypto-browserify"
-  },
   "dependencies": {
     "bigi": "1.1.0",
     "bs58": "1.2.1",
     "bs58check": "1.0.1",
-    "crypto-js": "3.1.2-3",
-    "crypto-browserify": "3.0.0",
     "ecurve": "1.0.0"
   }
 }

src/crypto.js

@@ -1,8 +1,4 @@
-// Crypto, crypto, where art thou crypto
-var assert = require('assert')
-var CryptoJS = require('crypto-js')
 var crypto = require('crypto')
-var convert = require('./convert')
 
 function hash160(buffer) {
   return ripemd160(sha256(buffer))
@@ -29,16 +25,8 @@ function HmacSHA256(buffer, secret) {
   return crypto.createHmac('sha256', secret).update(buffer).digest()
 }
 
-function HmacSHA512(data, secret) {
-  assert(Buffer.isBuffer(data), 'Expected Buffer for data, got ' + data)
-  assert(Buffer.isBuffer(secret), 'Expected Buffer for secret, got ' + secret)
-
-  var dataWords = convert.bufferToWordArray(data)
-  var secretWords = convert.bufferToWordArray(secret)
-
-  var hash = CryptoJS.HmacSHA512(dataWords, secretWords)
-
-  return convert.wordArrayToBuffer(hash)
+function HmacSHA512(buffer, secret) {
+  return crypto.createHmac('sha512', secret).update(buffer).digest()
 }
 
 module.exports = {

src/index.js

@@ -1,7 +1,6 @@
 module.exports = {
   Address: require('./address'),
   bufferutils: require('./bufferutils'),
-  convert: require('./convert'),
   crypto: require('./crypto'),
   ecdsa: require('./ecdsa'),
   ECKey: require('./eckey'),