linbozhang / packnode

Obfuscate, minify and/or encrypt node modules for private use

packnode minifies, obfuscates and/or encrypts node modules for private use.

To install packnode, use npm

$ npm install pack

Packing a module

To compress and obfuscate myscript.js using uglifyjs, run

$ cat myscript.js | packnode > packed.js

To encrypt myscript.js using the password pass123, run

$ cat myscript.js | packnode pass123 > packed.js

Encrypted modules can be accessed by calling

require(packed_file).unpack(password);

Example

The following example was packed using

$ packnode pass123 < hello1.js > hello2.js

hello1.js

exports.world = function () {
    console.log('Hello world!');
};

hello2.js

e="5b3be6d94448754b6d8484a78b5f30d7a2c2598105d0e225166a0132bef8b1cba74422cb32a08289d092e331652e403f4c3239716c3fd1d4605156d9ebb8781e";
exports.unpack=function(p){var d=require("crypto").createDecipher("aes256",p);eval(d.update(e,"hex","utf8")+d.final("utf8"));return exports}

Both are equivalent

require('./hello1').world();                    //Outputs 'Hello world!'

require('./hello2').unpack('pass123').world();  //Outputs 'Hello world!'

Advanced

CoffeeScript modules can be packed using

$ cat myscript.coffee | coffee -c -s | packnode pass123 > packed.js

To specify a custom encryption algorithm or output encoding, use -a and -e

$ packnode -a aes256 -e hex < myscript.js > packed.js

node.io has built-in support for unpacking encrypted modules.

To run an encrypted job, use the -u switch to specify the password

$ node.io -u pass123 myjob