added Passphrase model and service

js/models/core/Passphrase.js

@@ -0,0 +1,24 @@
+'use strict';
+
+function Passphrase(config) {
+ config = config || {};
+ this.salt = config.storageSalt;
+ this.iterations = config.iterations || 1000;
+};
+
+Passphrase.prototype.get = function(password) {
+  var hash = CryptoJS.SHA256(CryptoJS.SHA256(password));
+  var salt = CryptoJS.enc.Hex.parse(this.salt);
+  var key512 = CryptoJS.PBKDF2(hash, salt, { keySize: 512/32, iterations: this.iterations });
+
+  return key512;
+};
+
+Passphrase.prototype.getBase64 = function(password) {
+  var key512 = this.get(password);
+  var keyBase64 = key512.toString(CryptoJS.enc.Base64);
+
+  return keyBase64;
+};
+
+module.exports = Passphrase;

js/services/passphrase.js

@@ -0,0 +1,7 @@
+'use strict';
+
+var passphrase;
+angular.module('copay.passphrase').factory('Passphrase', function($rootScope) {
+  passphrase = passphrase || new copay.Passphrase(config);
+  return passphrase;
+});