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chore: create pure versions of the hash function solvers #357
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Description
Problem*
step towards #300
Summary*
This PR creates the
sha256,blake2s256,keccak256functions which form the core of the relevant black box function solvers. In future we can expose these to be reexported by the ACVM simulator (along with the ecdsa verifier).The hash function solvers have been refactored to be a single solver which is generic to any 256 hash function.
Additional Context
PR Checklist*
cargo fmton default settings.