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googlearchive / android-FingerprintDialog

Migrated:
https://github.com/android/security
Apache License 2.0
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Role of cryptoObject #46

Closed yashasvigirdhar closed 5 years ago

yashasvigirdhar commented 7 years ago

After going through the sample,

I am still curious about what is the use of passing cryptoObject to authenticate api of FingerprintManager.

If we see the code here, it stores the reference to cryptoObject in a field which it uses only at one place : to create the AuthenticationResult when authenticatin succeeds (see here).

Also, apart from this, it uses the cryptoObject's getOpId method to set some sessionId that it passes to authenticate api of IFingerprintService.

What's this OpId? I guess this is the thing that makes all difference, but I've no clue what it is and can't seem to find any documentation :-/

This question has been asked here, here and here but I didn't find a good answer in all the places.

codingjeremy commented 5 years ago

I am closing this issue/PR, as it has been migrated to the new repo linked above in the comments. Thank you!