wesleywh / qr_decoder

Display Google Authenticator QR codes to your camera and it will spit out all the info you need to move it to any other location.

What Is This?

This is a copy of a series of githubs and blog posts combined into a single convienant package for getting your qr code values from your authenticator app. I made this so I could easily transfer already made time base codes from one authenticator app into any other without having to turn off 2fa and turn it back on for the purpose of just having it in more than one place.

Important Note: I made this to personally work with Google Authenticator and BitWarden, so I haven't tried any of the others.

Installation Steps

1. brew install zbar
   • if M1 mac:
     a. mkdir ~/lib
     b. ln -s $(brew --prefix zbar)/lib/libzbar.dylib ~/lib/libzbar.dylib
     
   • if windows, this comes pre-installed can skip
   • if linux apt-get install zbar
2. pip install -r requirements.txt -t "full/path/to/this/dir"

How To Run

python decode_qr.py

Then open google authenticator (or some other TOTP app) and generate the QR code (normally via export menu). Show the QR code to your camera and it will spit out all the content you need from the QR code to your console. It will also save the content to a barcodes.csv file for you.

Generate QR Code Images

If you want to generate the QR code image to scan into another app on your phone (without another phone) then run the following command:

python decode_qr.py --generate qr_code

This will do all the same things as above but will also generate a qr_code.png file that is the url content of the qr code.

Change Saved FileName

python decode_qr.py --output my-new-file.csv

This will change the qr code content getting saved from barcodes.csv to my-new-file.csv.

Additional Notes

The start_webcam.py file, like the name suggests, will only start your webcam. Does nothing by itself. I only kept this for learning how to do this yourself.

Made Possible By

This is simply extractions and slight modifications from the following places:
https://github.com/scito/extract_otp_secret_keys
https://note.nkmk.me/en/python-pillow-qrcode/
https://pyimagesearch.com/2018/05/21/an-opencv-barcode-and-qr-code-scanner-with-zbar/
https://github.com/meticulousCraftman/QR-Code