Decencies

Introduction

This small document will explain how I cracked version 3.3.1 of JNIC. (https://jnic.dev)

Motive

The motive of this crack was simply to test the strength of "DRM" applied to JNIC.

Methodology

Discovering the funny

Upon opening the JNIC JAR in a decompiler, I quickly discovered a 'JNICLoader' class, which contained methods whos first parameter were MethodHandles (all of these methods were named 'invoke').

	/**
	* Creates a pipeline associated to this block.
	*
	* @param [I] the current block's input.
	* @param [O] the current block's output.
	* @param [K] the resulting block's output.
	*
	* @return a block of type ([I]) -> [K].
	*/
	operator fun <I, O, K> ((I) -> O).plus(next: (O) -> K): (I) -> K = { input -> next(this(input)) }

	#!/usr/bin/env python3

	from struct import *
	from argparse import *

	# Royal Kludge vendor ID
	rk_venor = 0x258a

	# Update File magic bytes
	upf_magic = b'\x5a\xa5SINO'

	/*
	* Auto-generated JNIC implementation file
	*
	*
	*
	*
	*
	*
	*/