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fix(DiffieHellman): reject mismatched moduli - #1042
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fmontesi merged 1 commit intoOct 6, 2026
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SamuelSchlesinger
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The correctness statement assumed that the initial network reached `0` in one transition, which is impossible. Use `MTr` so the statement covers complete executions. Adds a regression proof constructing a four-step execution from any initial store, with both final keys equal to `g ^ (a * b)`. Depends on #1042 (the modulus-check fix); this PR targets that branch. Implemented with Codex.
SamuelSchlesinger
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The evaluator expressed modulus equality as an implication, so a call with the wrong modulus accepted every result. Require modulus equality together with the expected computed value. Adds a regression check rejecting every result for both functions when the modulus differs, while retaining the valid role-evaluation checks. The field elements already have type `ZMod params.p`, so the corrected relation also avoids the old dependent casts. Depends on #1041 (the role-exponent fix); this PR targets that branch. Implemented with Codex.
SamuelSchlesinger
added a commit
that referenced
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Oct 7, 2026
The correctness statement assumed that the initial network reached `0` in one transition, which is impossible. Use `MTr` so the statement covers complete executions. Adds a regression proof constructing a four-step execution from any initial store, with both final keys equal to `g ^ (a * b)`. Depends on #1042 (the modulus-check fix); this PR targets that branch. Implemented with Codex.
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The evaluator expressed modulus equality as an implication, so a call with the wrong modulus accepted every result. Require modulus equality together with the expected computed value.
Adds a regression check rejecting every result for both functions when the modulus differs, while retaining the valid role-evaluation checks. The field elements already have type
ZMod params.p, so the corrected relation also avoids the old dependent casts.Depends on #1041 (the role-exponent fix); this PR targets that branch.
Implemented with Codex.