Bound random sampling domains and Paillier challenge widths - #15
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Adapt the common prime-size and unit-domain guards from public upstream dc9b957. Adapt the Paillier sampling changes from public upstream b64213a to this base. Use an 18-bit minimum for the local safe-prime candidate range and separation condition. Propagate empty sampler results through direct callers while preserving function signatures and the ordinary 2048-bit challenge output. These are source-level adaptations, not cherry-picks. This base has no quadratic-non-residue sampling helper, and its ModProof is outside the scope of this change. Add bounded domain checks, modulus-width controls, and a fixed 2048-bit challenge digest captured from base 86bd1a3.
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Depends on #13: the safe-prime result handoff must observe cancellation before the newly accepted small parameter sizes are used. This PR is stacked on
codex/helper-lifecycle.Reject empty prime and unit sampling domains and structurally unsupported Paillier key sizes. Mask expanded
GenerateXscandidates to the modulus width before rejection, and propagate empty sampler results through encryption, quadratic-residue generation, and direct MtA prover callers. The fixed-size Paillier proof constructor reports an invalid challenge domain with an explicit panic. The 18-bit structural floor is an implementation boundary, not a cryptographic security recommendation.The 2048-bit challenge output is unchanged, checked against a digest of all 13 deterministic challenges captured from the unmodified base. Validation includes bounded parameter checks, modulus-width controls, full
commonandcryptotests, and ordinary 2048-bit Paillier/MtA tests withGOMAXPROCS=2andgo test -p 1. Formatting, diff checks, and independent patch review passed.Source-level adaptation of public upstream
dc9b957db02aa186e5e438cf9bd840c57e789008andb64213a53a9a1f822c8dcdd9ad949cdfd27d6468.Full test CI and formatting CI were dispatched for this branch because the automatic PR trigger only covers master.