Move files to /model

js/models/Passphrase.js

@@ -0,0 +1,75 @@
+'use strict';
+
+// 65.7% typed (by google's closure-compiler account)
+
+var CryptoJS = CryptoJS || require('crypto-js');
+var preconditions = require('preconditions').instance();
+var _ = require('underscore');
+
+/**
+ * @desc
+ * Class for a Passphrase object, uses PBKDF2 to expand a password
+ *
+ * @constructor
+ * @param {object} config
+ * @param {string=} config.salt - 'mjuBtGybi/4=' by default
+ * @param {number=} config.iterations - 1000 by default
+ */
+function Passphrase(config) {
+  preconditions.checkArgument(!config || !config.salt || _.isString(config.salt));
+  preconditions.checkArgument(!config || !config.iterations || _.isNumber(config.iterations));
+  config = config || {};
+  this.salt = config.salt || 'mjuBtGybi/4=';
+  this.iterations = config.iterations || 1000;
+};
+
+/**
+ * @desc Generate a WordArray expanding a password
+ *
+ * @param {string} password - the password to expand
+ * @returns WordArray 512 bits with the expanded key generated from password
+ */
+Passphrase.prototype.get = function(password) {
+  var hash = CryptoJS.SHA256(CryptoJS.SHA256(password));
+  var salt = CryptoJS.enc.Base64.parse(this.salt);
+  var key512 = CryptoJS.PBKDF2(hash, salt, {
+    keySize: 512 / 32,
+    iterations: this.iterations
+  });
+  return key512;
+};
+
+/**
+ * @desc Generate a base64 encoded key
+ *
+ * @param {string} password - the password to expand
+ * @returns {string} 512 bits of a base64 encoded passphrase based on password
+ */
+Passphrase.prototype.getBase64 = function(password) {
+  var key512 = this.get(password);
+  var keyBase64 = key512.toString(CryptoJS.enc.Base64);
+  return keyBase64;
+};
+
+
+/**
+ * @desc Callback for the Passphrase#getBase64Async method
+ * @callback passphraseCallback
+ * @param {string} passphrase 512 bits of a base64 encoded passphrase based on password
+ */
+
+/**
+ * @desc Generate a base64 encoded key, without blocking
+ *
+ * @param {string} password - the password to expand
+ * @param {passphraseCallback} cb
+ */
+Passphrase.prototype.getBase64Async = function(password, cb) {
+  var self = this;
+  setTimeout(function() {
+    var ret = self.getBase64(password);
+    return cb(ret);
+  }, 0);
+};
+
+module.exports = Passphrase;