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Rust limitation no longer applies; warning about circom/arkworks diff

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mmagician
2024-07-18 09:18:01 +02:00
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README.md
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@@ -65,9 +65,12 @@ Tests require the following installed:
- [x] Proof generations and verification using Arkworks
- [ ] CLI for common operations
## Known limitations
## Notes
Currently, due to an issue in our upstream (https://github.com/wasmerio/wasmer/issues/4072), this crate works as expected only up to Rust version `1.67.0`; in newer Rust versions, `wasmer` is currently unsound.
The prover key generated by circom differs from the one generated by arkworks' groth16 library. While the format is the same, it represents different values.
Circom 'prepares' the powers of tau by converting them to Lagrange base, i.e. from `s^i.G` -> `L_i(s).G`. This affects the witness generation process, and the caller needs to ensure the correct `R1CSToQAP` implementer is used:
- use [`CircomReduction`](https://github.com/arkworks-rs/circom-compat/blob/b892c62597687c23341cda1e8e89d58bb6428f36/src/circom/qap.rs#L12) for working with circom-generated files,
- use [`LibsnarkReduction`](https://github.com/arkworks-rs/groth16/blob/5272c935bda290a24cd18d0a3f994b0af70d5f27/src/r1cs_to_qap.rs#L101) for setup produced using the arkworks backend.
## Acknowledgements