Logs from the real device showed that with the previous fixes save and
listGroups now work correctly (878 → 1162 bytes written, file found
after restart), but decrypt was throwing:
InvalidAlgorithmParameterException: Only GCMParameterSpec supported
at AndroidKeyStoreAuthenticatedAESCipherSpi$GCM.initAlgorithmSpecificParameters
AndroidKeyStore's authenticated AES/GCM cipher rejects plain
IvParameterSpec and requires an explicit GCMParameterSpec with the
auth tag length. Switched decrypt() to use GCMParameterSpec(128, iv).
While chasing this I also noticed that MlsGroupManager.restoreAll
was **deleting** the stored group on any exception from load(), on
the assumption that it must be corrupted. This turned a transient
decrypt bug into permanent data loss — the user's group file was
wiped during the first broken restart. Change the catch block to
log and skip instead of delete, so after a fix the next restart
can still recover the data.
https://claude.ai/code/session_014EKS8JBwSpap34aM6FnYLm
Claude
c04d3d0bf0