valid nodejs code in string to javascript object

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?

Anatoliy · Accepted Answer · 2012-11-05 19:04:42Z

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 ;)

edited Nov 5, 2012 at 19:04

answered Nov 5, 2012 at 18:08

Anatoliy

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6 Comments

rda3mon Over a year ago

Thanks. I saw this stackoverflow.com/a/9163557/458816 too. But I get SyntaxError: Unexpected token ILLEGAL. I thought it is encoding issue and converted to utf-8. but no use.

Anatoliy Over a year ago

This code should work, because this code stolen from working library. Check your sources you are trying to _compile.

rda3mon Over a year ago

I am still struggling with the error. Do you think it can be encoding issues? Any other suggestions?.

Anatoliy Over a year ago

What do you see on console.log(content);? Expected source code? What if replace real code with some simple example like module.exports = 2 + 2;

rda3mon Over a year ago

I see real code. And I tried as simple as var x = 10. Still same problem.

|

Community · Accepted Answer · 2017-05-23 12:12:20Z

0

module.exports is an object you can assign to (ie: module.exports.newFunc = someFunction;)

JSON.parse(crypt.decrypt(module.filename, 'out'));

EDIT So you should make your encrypted file a JSON class OR check out this answer to a similar question Load "Vanilla" Javascript Libraries into Node.js

edited May 23, 2017 at 12:12

CommunityBot

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answered Nov 5, 2012 at 15:25

Louis Ricci

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3 Comments

rda3mon Over a year ago

it didn't work. Because the string is plain and not JSON.stringify generated. Parse Error: SyntaxError: Unexpected token e

Louis Ricci Over a year ago

@mv945 - So you should make your encrypted file a JSON class OR check out this answer to a similar question stackoverflow.com/questions/5171213/…

rda3mon Over a year ago

you pointed me right direction. thanks.. But I cannot accept your answer unless you edit it :)

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