Argon2 on x86-64: prove independent-address input preparation - #490
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Prepare the independent-address input used by Argon2i and Argon2id: clear a full block, then write the seven public words for pass, lane, slice, rounded block count, pass count, variant and one-based address counter. All remaining words stay zero.
Prove the complete clear and header, exact agreement with the input of the reviewed
Spec.Argon2.addressBlock, memory frames, register/permission and MXCSR preservation, and fixed traces for public destination/frame pointers. Compose short generic word proofs by induction; frame fields remain readable and unchanged throughout the header writes. Add a generic block-word/vector-update lemma for the following filling proofs.Builds on #487. This is an inline address-generation layer; composing its two verified G calls and the filling loops follows. No specification, TCB or public API changes, and no assembly emitted yet.
Validation: targeted Lean builds and checked literals, standard-axiom and compiler-override audits, specification-origin audit, Lean import/proof-speed checks, and
git diff --check. Full checks run in CI.