encrypt_decrypt.js

function encrypt(text,key){
  var cipher = crypto.createCipher('aes-256-cbc',key)
  var crypted = cipher.update(text,'utf8','hex')
  crypted += cipher.final('hex');
  return crypted;
}

function decrypt(text,key){
  var decipher = crypto.createDecipher('aes-256-cbc',key)
  var dec = decipher.update(text,'hex','utf8')
  dec += decipher.final('utf8');
  return dec;
}

var hw = encrypt("hello world",'d6F3Efeq')
decrypt(hw,'d6F3Efeq')

// feel free to change >> d6F3Efeq
// To test just copy + paste the above inside the node shell
// TIP: always encrypt IDs before sending via HTTP

encrypt_decrypt2.js

# 引用 http://stackoverflow.com/questions/6953286/node-js-encrypting-data-that-needs-to-be-decrypted

var crypto = require('crypto');
var assert = require('assert');

var algorithm = 'aes256'; // or any other algorithm supported by OpenSSL
var key = 'password';
var text = 'I love kittens';

var cipher = crypto.createCipher(algorithm, key);  
var encrypted = cipher.update(text, 'utf8', 'hex') + cipher.final('hex');
var decipher = crypto.createDecipher(algorithm, key);
var decrypted = decipher.update(encrypted, 'hex', 'utf8') + decipher.final('utf8');

assert.equal(decrypted, text);