Fix GCM multi-call Encode/Decode streaming (GHASH + CTR) and multi-chunk tests#99

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omonien:pr-fix-gcm-multichunk

Commits on Jul 23, 2026

Fix GCM multi-call Encode/Decode GHASH and CTR streaming (Option A). Accumulate GHASH and partial CTR keystream across Encode/Decode calls; finalize the authentication tag in TGCM.Done (wired from…
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Make GCM Done idempotent and reject post-finalization updates. Add FFinalized so repeated Done leaves the tag unchanged and Encode/Decode after finalization raise until Init. Document the contract…
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Extract shared CAVS multi-chunk vector constants in GCM tests.
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