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25 lines
1.4 KiB
Markdown
25 lines
1.4 KiB
Markdown
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# Trusted base
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What you must believe for the theorems in this repository to transfer to the
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running Rust code. Everything else is machine-checked.
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1. **Lean 4 kernel** (v4.30.0-rc2) and its three foundational axioms
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`[propext, Classical.choice, Quot.sound]`. Every certificate is
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`#print axioms`-audited against exactly this list.
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2. **mathlib** (prebuilt oleans fetched by `lake exe cache get`).
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3. **Charon + Aeneas** (pinned `9dd7f23c` / `bf13c42e`): the translation
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from Rust MIR to the Lean model is assumed faithful. The generated
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`gen/` files are never edited (comments only); proofs are stated ABOUT them.
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4. **External-function models** (`gen/*/FunsExternal.lean`): Rust items that
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Aeneas cannot translate (constant-time `subtle` primitives, iterator
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plumbing, formatting) are axiomatized as opaque symbols. The axiom audit
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proves none of these axioms enters the dependency cone of any certificate,
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except where a model is explicitly listed below.
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5. **u64 primitive helpers** (`adc`/`sbb`/`mac`, if not translatable): where a
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helper must be modeled externally, its model is a *definition* with proven
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arithmetic content (not an opaque axiom), or an axiom provably outside every
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certificate cone. The axiom audit enforces this.
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6. **Compilation of Rust to machine code** (rustc backend) is out of scope,
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as is side-channel behaviour (timing, speculation). The proofs are about
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functional correctness at the MIR/LLBC level.
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