cipher_utils.js

// module
var crypto = require('crypto');

// Constant
var HASH_TYPE = 'sha256';
var HASH_UPDATE_DATA = 'PegasusNemberQer!!!';
var INITIALIZE_VECTOR = '41chcgDa1qAC9c3l';
var CHIPER_TYPE = 'aes-256-cbc';
var ENCODE_TYPE = 'base64';

var KEY = crypto.createHash(HASH_TYPE).update(HASH_UPDATE_DATA).digest();

exports.encrypt = function(str) {
  var cipher = crypto.createCipheriv(CHIPER_TYPE, KEY, INITIALIZE_VECTOR);
  var result = cipher.update(str, 'utf8') + cipher.final();
//  console.log('res1: ' + result);

  var ret = new Buffer(result, 'binary');

  return ret.toString(ENCODE_TYPE);
}


exports.decrypt = function(str) {
  var decoded = new Buffer(str, ENCODE_TYPE);
  var decipher = crypto.createDecipheriv(CHIPER_TYPE, KEY, INITIALIZE_VECTOR, decoded);
  var result = decipher.update(decoded, 'utf8') + decipher.final();

  var ret = new Buffer(result, 'binary');
//  console.log('res1: ' + ret.toString('utf8'));

  return ret.toString('utf8');
}

exports.xorEncrypt = function(key, str) {
  var encrypted = "";
  var keyCount = 0;
  for (var i = 0; i < str.length; i++) {
    var c = str.charCodeAt(i) ^ key.charCodeAt(keyCount++);
    encrypted += String.fromCharCode(c);
    if (keyCount == key.length) keyCount = 0;
  }

  return encrypted.toString('utf-8');
};

exports.xorDecrypt = function(key, str) {
  var decrypted = "";
  var keyCount = 0;
  for (var i = 0; i < str.length; i++) {
    var c = str.charCodeAt(i) ^ key.charCodeAt(keyCount++);
    decrypted += String.fromCharCode(c);
    if (keyCount == key.length) keyCount = 0;
  }

  return decrypted.toString('utf-8');
};

var text = 'Hello';
var encText = exports.encrypt(text);
var decText = exports.decrypt(encText)
console.log('--------------------');
console.log(encText);
console.log(decText);
console.log('--------------------');

encText = exports.xorEncrypt("test1", "hellasdfljaksldjfasdkflkajsdflkjasdkflo");
decText = exports.xorDecrypt("test1", encText);
console.log('--------------------');
console.log(encText);
console.log(decText);
console.log('--------------------');