Argon2 on x86-64: prove independent-address caching - #495
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Cache independent-address blocks by the one-based counter
index / 128 + 1, generating a new block only when that public counter changes. Readindex % 128from the cached block into the secret random-word register. A zero initial counter forces regeneration at every starting index, including the first segment's index two.Prove the complete regeneration/reuse operation against the reviewed
Spec.Argon2.addressBlock, its cache invariant, the indexed read, memory permissions and frames, callee-saved registers and MXCSR. Prove equal traces for public positions, counters and layout pointers while leaving the random word secret.Builds on #494. This is an inline filling layer; no specification, TCB, public API or generated assembly changes.
Validation: targeted Lean builds of correctness and trace modules, standard-axiom and compiler-override audits, specification-origin audit, Lean import/proof-speed checks, and
git diff --check. Full checks run in CI.