Argon2 on x86-64: prove dependent random-word selection - #498
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Read the cyclic previous cell's first word for Argon2d and the data-dependent phase of Argon2id. Compute its address from the public loop position and matrix base, then return the secret word in
rdifor the filling step.Prove exact agreement with the random word selected by the reviewed filling spec, read permissions and matrix bounds, unchanged memory/permissions/MXCSR, retained loop/allocation invariants, and equal traces for public layout and positions without requiring equal cell contents. Add a checked pointer literal and reuse the existing column and block-address proofs.
Builds on #497. Inline source layer only; no specification, TCB, public API or generated assembly changes. Combining the independent and dependent sources follows.
Validation: targeted Lean correctness/trace/state 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.