birthMonth decoding issue about coronacheck-tools HOT 12 CLOSED

What would be the expected result? This seems to be a null-char, is that correct?

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It looks like a null byte, isn't it supposed to contain a 1-12 number?

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You should have an email.

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Is this a QR code of a negative test result? I haven't parsed that one through my tool until now. It looks like the data was deserialized properly. The app QR code after vaccination usually contains the birthMonth and not the birthDay field. Looks like it's the other way around for this particular QR.

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This is a coronacheck app result after 2 vacinations, the birthDay field is correct but somehow the month is omitted.

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There really isn't any other data in that particular field for this QR. I guess they generate the QR with birthDay left out and somtimes with birthMonth left out. Mine has birthDay left out for example.

You can verify this by going to your coronacheck app and pressing the ? icon on the top right while displaying the Dutch QR code. Under 'your details' It'll show the data inside the QR. In your case it probably has an underscore instead of a month but your birthDay should be filled in. As well as your firstName and lastName initials.

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You are correct, sorry for the inconveinience.

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No problem. Good luck with your project. ;)

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Thanks, do you by any chance have a clue on how to validate the other data against the governments certificates?

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What do you mean with other data?

This tool can verify a QR code either through the CLI tool or through the Python API if thats what you mean. It uses a thin wrapper around the governments mobilecore verifier. Similar to the coronacheck scanner app. The QR that you supplied is considered invalid.

CLI tool: https://github.com/Sikerdebaard/coronacheck-tools#verify

Python API example: https://github.com/Sikerdebaard/coronacheck-tools/blob/main/examples/qr_validator.py

Your particular QR result:

coronacheck-tools verify qr ./QR.jpg 
This is an unofficial tool that is in no way affiliated with CoronaCheck.nl or the Ministry of VWS
Code is invalid Could not verify domestic QR code: The credential has been generated too long ago, or clock skew is too large

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That indeed validates them, but their lifespan is pretty short (which is good I guess), many thanks!

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Try the paper one. That one skips the time based challenge. Last time I checked it was valid for a year.

https://coronacheck.nl/nl/print/

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