text: // 参考 https://github.com/darknessomi/musicbox/wiki/
  'use strict'
  const crypto = require('crypto')
  const bigInt = require('big-integer')
  const modulus =
    '00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7'
  const nonce = '0CoJUm6Qyw8W8jud'
  const pubKey = '010001'
  
  String.prototype.hexEncode = function () {
    let hex, i
  
    let result = ''
    for (i = 0; i < this.length; i++) {
      hex = this.charCodeAt(i).toString(16)
      result += ('' + hex).slice(-4)
    }
    return result
  }
  
  function createSecretKey(size) {
    const keys = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
    let key = ''
    for (let i = 0; i < size; i++) {
      let pos = Math.random() * keys.length
      pos = Math.floor(pos)
      key = key + keys.charAt(pos)
    }
    return key
  }
  
  function aesEncrypt(text, secKey) {
    const _text = text
    const lv = new Buffer('0102030405060708', 'binary')
    const _secKey = new Buffer(secKey, 'binary')
    const cipher = crypto.createCipheriv('AES-128-CBC', _secKey, lv)
    let encrypted = cipher.update(_text, 'utf8', 'base64')
    encrypted += cipher.final('base64')
    return encrypted
  }
  
  function zfill(str, size) {
    while (str.length < size) str = '0' + str
    return str
  }
  
  function rsaEncrypt(text, pubKey, modulus) {
    const _text = text.split('').reverse().join('')
    const biText = bigInt(new Buffer(_text).toString('hex'), 16),
      biEx = bigInt(pubKey, 16),
      biMod = bigInt(modulus, 16),
      biRet = biText.modPow(biEx, biMod)
    return zfill(biRet.toString(16), 256)
  }
  
  function Encrypt(obj) {
    const text = JSON.stringify(obj)
    const secKey = createSecretKey(16)
    const encText = aesEncrypt(aesEncrypt(text, nonce), secKey)
    const encSecKey = rsaEncrypt(secKey, pubKey, modulus)
    return {
      params: encText,
      encSecKey: encSecKey
    }
  }
  
  module.exports = Encrypt