Real MediaTek mt6768 KeyMint silently returns OK on non-AEAD
updateAad, contradicting AOSP's mandate at
system/keymint/ta/src/operation.rs:430-446 to throw InvalidTag
when aad_allowed is false. Duck-detector flags this divergence
as "updateAad mismatch" in OperationErrorPathProbe.
Wire UPDATE_AAD into OperationInterceptor and inject
ServiceSpecificException(INVALID_TAG) when create params
indicate non-AEAD. AEAD (BlockMode.GCM) passes through to real
KeyMint untouched so AES-GCM round-trips remain valid.
Enginex0
59836e143c