Case study

Goodix 55a4: reconstructing a Linux fingerprint driver

The Goodix 55a4 project reconstructs Linux support for the 27c6:55a4 fingerprint sensor through a libfprint patch. Its research combines USB captures with examination of the vendor's Windows driver to document command behavior, image acquisition and host-side matching. Installation scripts provision the sensor key and configure fprintd.

Targets: Binary · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-08
Evidence class: C2 code & docs, no demo or download

Stars: 10
Last commit: 2026-08-30
Language: Shell
License (GitHub): LGPL-2.1

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Requires a Goodix 27c6:55a4 sensor, Linux, fprintd and the documented build dependencies.
Testing evidence: The author reports enrollment and verification on one sensor; other models are not covered by the patch.
Limits: The sensor uses a publicly known all-zero TLS pre-shared key, and fprintd stores templates as plain files.
License: LGPL-2.1 license.

Cite

BibTeX

@misc{goodix-27c6-55a4-fingerprint-case,
  title = {{Goodix 55a4: reconstructing a Linux fingerprint driver}},
  howpublished = {\url{https://github.com/Hydrogell/goodix-27c6-55a4-fingerprint-linux}},
  url = {https://github.com/Hydrogell/goodix-27c6-55a4-fingerprint-linux},
  urldate = {2026-11-08},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/goodix-27c6-55a4-fingerprint-case/}}
}

Plain text

Goodix 55a4: reconstructing a Linux fingerprint driver. https://github.com/Hydrogell/goodix-27c6-55a4-fingerprint-linux (accessed 2026-11-08). Awesome REA entry: https://awesomerea.org/resources/goodix-27c6-55a4-fingerprint-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

docs/PROTOCOL.md GitHub · Hydrogell/goodix-27c6-55a4-fingerprint-linux · Revision fe27b48
README.md GitHub · Hydrogell/goodix-27c6-55a4-fingerprint-linux · Revision fe27b48