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Argon2 on x86-64: prove segment addressing-mode selection - #499
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Compute the public segment addressing mode: Argon2i always uses independent addressing, Argon2id does so for slices zero and one of pass zero, and Argon2d always uses dependent addressing. Return a zero/one word in
r10for the source dispatcher.Prove the result equals
Spec.Argon2.independent, along with register, memory, permission and MXCSR preservation and a fixed trace for the public frame pointer. Compose short mask proofs and a checked literal; reuse the reviewed variant codes and normalized pass/slice words.Builds on #498. Inline mode-selection layer only; no specification, TCB, public API or generated assembly changes.
Validation: targeted Lean correctness/trace builds and checked literal, standard-axiom and compiler-override audits, specification-origin audit, Lean import/proof-speed checks, and
git diff --check. Full checks run in CI.