greenpass qrcode reader

decode & dump data from greenpass 📄

The "evolution" of greenpass_string_reader, less academic approach.

Dependencies: base45-ansi-C, zlib, COSE-C, zbar, libpng.

About base45-ansi-C it raise many warning because it make an signed integer overflow (which is UB) i don't care for now, but it's important to know i have opened a pull request for this.

Install deps (archlinux)

pacman -S zbar zlib libpng

Build

# then into the folder
mkdir -p build && cd build
cmake ..
make -j`nproc`

Or if you want use mold linker

mkdir -p build && cd build
cmake .. -DCMAKE_EXE_LINKER_FLAGS='-fuse-ld=mold' -DCMAKE_SHARED_LINKER_FLAGS='-fuse-ld=mold'
make -j`nproc`

Useful links

• https://github.com/jojo2234/GreenPass-Experiments
• https://dencode.com/string/base45
• https://lorenzomillucci.it/posts/2021/06/2021-06-28-ubuntu-decodificare-greenpass-covid-19 (italian)
• https://dday.it/redazione/39870/cosa-ce-scritto-nel-qrcode-del-green-pass-come-decodificarlo-per-guardarci-dentro (Italian)
• https://github.com/eu-digital-green-certificates/dgc-testdata

TODO

• memory overlap warning into zbar library (try with another version) valgrind --undef-value-errors=no --tool=memcheck --leak-check=yes --show-reachable=yes --num-callers=20 --track-fds=yes ./greenpass_qrcode_reader

Copyright © 2021, Manu-sh, s3gmentationfault@gmail.com. Released under the MIT license.