ww9

Cracking PDF password with broteforce using Docker + Python

I needed to pay a bill where the barcode was password protected.

I found https://gist.github.com/dhondta/efe84a92e4dfae3b6c14932c73ab2577 but the Dockerfile was broken becuase it used abbandoned CentOS.

So I converted the Dockerfile to Ubuntu and it worked! Took around 20 seconds to crack 3 number password.

Instructions

Use struct{} as keys for context.Value() in Go

In the other file of this gist I detail why we should use struct{} as context.Value() keys and not int or string. Open gist to see main.go but the TLDR is:

	type key struct{}
	ctx = context.WithValue(ctx, key{}, "my value") // Set value
	myValue, ok := ctx.Value(key{}).(string) // Get value

Go type assertion is fast

Benchmark showing that Go type assertion is pretty fast.

Discussion: https://old.reddit.com/r/golang/comments/9xs0r2/why_is_type_assertion_so_fast/

Go vanilla web server

Go web server with logging, tracing, health check, graceful shutdown and zero dependencies.

Gist markdown examples

A collection of Markdown code and tricks that were tested to work in Gist.

This and all public gists in https://gist.github.com/ww9 are Public Domain. Do whatever you want with it including , no need to credit me.

Todo

Reformat this whole document and assimilate these:

TLDR

Public Domain is not a license and isn't legally accepted in some countries. So if you want to give stuff for free, it's better to just license it under MIT or BSD.

Public Domain Software

The term “public domain” refers to creative materials that are not protected by intellectual property laws such as copyright, trademark, or patent laws. The public owns these works, not an individual author or artist. Anyone can use a public domain work without obtaining permission, but no one can ever own it. - Stanford University definition

Can	Cannot

Blogging with Gist

Gist simplicity can turn blogging into a liberating experience.

Pros	Cons
✅ Free, simple, fast, hassle-free	❌ Image upload in comments only
✅ Tagging	❌ No post pinning
✅ Search	❌ Doesn't look like a blog
✅ Revisions	❌ Unfriendly URLs

GUI programs using Go and HTML/CSS/JS

Superior to similar solutions. Doesn't use electron or cgo. Easy communication between Go and Js. Can easily use libs like React, Vue and Angular.

This is a demo app using GUI library https://github.com/zserge/lorca which requires only Chrome and might even work with Firefox in the future.

	# Usage:
	# docker build -t pdftool .
	# docker run --rm -it pdftool /bin/bash
	# >> python3 pdf-password-bruteforcer.py your_pdf_file.pdf

	FROM ubuntu:20.04

	# set environment variables
	ENV PYTHONDONTWRITEBYTECODE=1
	ENV PYTHONUNBUFFERED=1

	# Collection of one line text art (◕‿◕✿)

	Collection of emojis and one line text art like (╯°□°）╯︵ ┻━┻ 🤗

	ּבּ_בּ
	טּ_טּ
	כּ‗כּ
	לּ_לּ
	מּ_מּ
	סּ_סּ