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infinum / Android-Goldfinger

Android library to simplify Biometric authentication implementation.

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decrypt onSuccess() gives an empty string

chadbohannan opened this issue · comments

commented

Hi,
I really like the elegance of the Goldfinger API but I'm not getting decryption functionality out of the box. Perhaps I'm doing something wrong but I'm using the default configuration. The library was trivial to integrate into a workflow and events occur as expected, but the decrypting onSuccess() function is giving me an empty string when i expect "password"

Cool:
encrypt("biometric_key", "password", callback) -> "ARCJKF3KqYAw0NQBr5gRIA==\n "

Not Cool:
decrypt("biometric_key", "ARCJKF3KqYAw0NQBr5gRIA==\n ", callback) -> ""

Am i missing something silly like a permission or whatnot?

commented

Hi @chadbohannan,

from the looks of it, it seems you are using the library as intended.

  1. Is this issue device specific or it happens on multiple devices?
  2. Does example application work correctly on your device?
  3. Do you have enabled logging? If so, do you get any specific log or error in logcat?
commented

Thanks for the quick response!
Behavior is consistent between the emulator and my Pixel XL, both running Android 9 (API 28).
Nothing interesting occurs in the logs. The state transitions are happening as and when I expect, the only problem callback occurs with a successful biometric scan, but I get an empty string back.

the most interesting log messages:

2018-11-06 11:36:06.930 1791-1821/? D/FingerprintHal: ----------------> send_scan_notice ----------------->
2018-11-06 11:36:07.018 1791-1821/? D/android.hardware.biometrics.fingerprint@2.1-service: onAcquired(0)
2018-11-06 11:36:07.027 1791-1821/? D/android.hardware.biometrics.fingerprint@2.1-service: onAuthenticated(fid=45146572, gid=0)
2018-11-06 11:36:07.229 1791-1821/? D/FingerprintHal: fingerprint ID 0 off
2018-11-06 11:36:08.732 1774-1774/? D/keystore: AddAuthenticationToken: timestamp = 1826608, time_received = 1828
2018-11-06 11:36:08.758 1990-1990/system_process V/FingerprintService: onAuthenticated(owner=com.company.app, id=45146572, gp=0)
2018-11-06 11:36:09.595 1990-1990/system_process V/FingerprintService: Done with client: com.company.app
commented

Update: I've tried swapping out Goldfinger with Mauin/RxFingerprint and i'm having the same experience. This points the finger more at me than Goldfinger, so I'll keep digging.

commented

Developer is a bonehead and cleared the password edit immediately before reading it. Decrypted value was correclty the empty string.

commented

Thank you for letting us know what the issue was and for closing the issue.