https://github.com/hannob/vacdec

Python script to decode the EU Covid-19 vaccine certificate
https://github.com/hannob/vacdec

Last synced: 12 days ago
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Python script to decode the EU Covid-19 vaccine certificate

• Host: GitHub
• URL: https://github.com/hannob/vacdec
• Owner: hannob
• License: unlicense
• Created: 2021-06-25T13:52:34.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2022-01-13T15:49:36.000Z (almost 3 years ago)
• Last Synced: 2024-10-16T10:43:40.610Z (26 days ago)
• Language: Python
• Size: 25.4 KB
• Stars: 243
• Watchers: 12
• Forks: 89
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# vacdec

Python script to decode the EU Covid-19 vaccine certificate, as [specified by the EU](https://ec.europa.eu/health/ehealth/covid-19_en).

This script takes an image with a QR code of a vaccine certificate as

the parameter and will show the certificate's content.

**It will not validate the signature.**

A [fork of this script with signature verification exists](https://github.com/HQJaTu/vacdec/tree/signature-verification).

The code is very short and should provide an easy way to understand

how these certificates are encoded:

* The QR code encodes a string starting with "HC1:".

* The string following "HC1:" is base45 encoded.

* Decoding the base45 leads to zlib-compressed data.

* Decompression leads to a CBOR Web Token structure.

## setup

You will need the python pillow, pyzbar, cbor2 and base45 packages. Additionally, you need zbar. For Mac OS X, it can be installed via `brew install zbar`, on Debian systems via `apt install libzbar0`. [Source](https://pypi.org/project/pyzbar/)

If you want to install `cbor2` on Windows, you might get an error that you need the Microsoft Visual C++ Extension installed. This is only required if you want to have the `cbor2` optional C extension installed. You can skip it by setting the environment variable `CBOR2_BUILD_C_EXTENSION=0` before installing it via `pip`.

You can install them via your distribution or via pip:

```

pip install base45 cbor2 pillow pyzbar

```

## usage

Run:

```

./vacdec [image]

```

[image] can be an image in any format pillow supports, including of

course PNG and JPG.

A test certificate can be found [here](https://github.com/Digitaler-Impfnachweis/certification-apis/tree/master/examples).

## author

Written by [Hanno Böck](https://hboeck.de/).