ls_crypto/index.js

//test under node v6.11.1

const crypto = require("crypto");
// import CryptoES from "crypto-es";
// const assert = require('assert');
const URLSafeBase64 = require("urlsafe-base64");

function encode_data(app_secret = "f381e66efc9611e6a8faf45c89a03281", data) {
  var datajson = JSON.stringify(data);
  var cryptkey = crypto
    .createHash("sha256")
    .update(app_secret, "utf8")
    .digest()
    .slice(0, 16);
  var iv = crypto.randomBytes(16);
  var encipher = crypto.createCipheriv("aes-128-cbc", cryptkey, iv);
  encipher.setAutoPadding((auto_padding = true));
  var encdata = Buffer.concat([
    encipher.update(datajson, "utf8"),
    encipher.final(),
  ]);
  var enc = Buffer.concat([iv, encdata]);
  return URLSafeBase64.encode(enc).toString("hex");
}

function decode_data(app_secret = "f381e66efc9611e6a8faf45c89a03281", enc) {
  var encdata = URLSafeBase64.decode(enc);
  var cryptkey = crypto
    .createHash("sha256")
    .update(app_secret, "utf8")
    .digest()
    .slice(0, 16);
  var iv = encdata.slice(0, 16);
  encdata = encdata.slice(16);
  var decipher = crypto.createDecipheriv("aes-128-cbc", cryptkey, iv);
  decipher.setAutoPadding((auto_padding = true));
  var datajson = Buffer.concat([
    decipher.update(encdata, "utf8"),
    decipher.final(),
  ]).toString("utf8");
  return JSON.parse(datajson);
}
module.exports = {
  encode_data,
  decode_data,
};