/**
 * Created by lintry on 16/4/19.
 * 
 * 加密解密算法工具
 */
"use strict";

module.exports = function () {
  const CryptoJS = require("crypto-js"),
    uuid = require('node-uuid');

  const DEFAULT_KEY = '0102030405060708',
    DEFAULT_IV = '0000000000000000',
    PADDING_CHAR = 'ABCDEFGHIJKLMNOP',
    PADDING_LENGTH = 16;
  var cj = {};

  function padding(text) {
    text = text || '';
    return text + PADDING_CHAR.substr(0, PADDING_LENGTH - ((text.length % PADDING_LENGTH)||PADDING_LENGTH));
  }

  cj.AESEncode = function (word, sKey, sIv) {
    var key = CryptoJS.enc.Utf8.parse(padding(sKey || DEFAULT_KEY));
    var iv = CryptoJS.enc.Utf8.parse(padding(sIv || DEFAULT_IV));
    var srcs = CryptoJS.enc.Utf8.parse(word);
    var encrypted = CryptoJS.AES.encrypt(srcs, key, {iv: iv, mode: CryptoJS.mode.CBC});
    return encrypted.toString();
  };

  cj.AESDecode = function (word, sKey, sIv) {
    var key = CryptoJS.enc.Utf8.parse(padding(sKey || DEFAULT_KEY));
    var iv = CryptoJS.enc.Utf8.parse(padding(sIv || DEFAULT_IV));
    var decrypted = CryptoJS.AES.decrypt(word, key, {iv: iv, mode: CryptoJS.mode.CBC});
    return CryptoJS.enc.Utf8.stringify(decrypted).toString();
  };

  cj.Base64Encode = function (text) {
    var words = CryptoJS.enc.Utf8.parse(text);
    return CryptoJS.enc.Base64.stringify(words);
  };

  cj.Base64Decode = function (text) {
    return CryptoJS.enc.Base64.parse(text).toString(CryptoJS.enc.Utf8);
  };

  cj.MD5 = function (text) {
    return CryptoJS.MD5(text).toString();
  };

  cj.SHA1 = function (text) {
    return CryptoJS.SHA1(text).toString();
  };

  cj.UUID = function() {
    return uuid.v4().replace(/[-]/g,'');
  };

  return cj;
}();