Decode the EU Green-Pass QRCode Using Java

The process is done in 4 simple steps.

Photo by Markus Winkler on Unsplash

This is an elaboration of the original article for python written by Tobias Schlottke

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TL;DR: check this Github repo.

Note: The first input is the File Image. Then, for every step, the input is the output of the previous one.

1- Convert your QR code into the actual text

You will need https://github.com/zxing/zxing library:

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

The text at this point will contain a string like this:

HC1:6BdFOXN%TS3fDHPVO13J…