autoCAT6 commented on PR #54884:
URL: https://github.com/apache/arrow/pull/54884#issuecomment-6354344510

   Thanks, updated. I shortened the description and simplified the algorithm 
copy. Signing and both verification paths now explicitly use GCM.
   
   I checked the old code too: `metadata=true` already selects GCM, and 
`SignedFooterEncrypt` rejects CTR. The new footer tag test also passes on the 
previous head. So the behavior fix is the metadata value; the GCM calls just 
make the signing rule clear.
   
   C++ tests and the Java 1.18.1 checks pass.


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