Question

My Goal: I am trying to encrypt .js files into .jse and decrypt only when it is running (obfuscate nodejs code).

var ffi = require('ffi');

//libpcrypt.so is a library to encrypt and decrypt files
var crypt = ffi.Library('./libpcrypt', {
  'decrypt' : [ 'string', ['string', 'string']]
});

require.extensions[".jse"] = function (module) {
   module.exports = (crypt.decrypt(module.filename, 'out'));
};

console.log(require('./routes.jse'));

I know, with cosole.log() source code can be printed out.

Problem: Decrypted code is a plain string, I am not able to convert it into a valid javascript object for exports. Is there a way to export the code string I decrypted?

Answer 1

Here’s your solution (not tested):

require.extensions['.jse'] = function(module, filename) {
  var content = crypt.decrypt(fs.readFileSync(filename), 'out')
  return module._compile(content, filename);
};

Happy debugging encrypted modules 😉