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This PR implements the
FrSponge
andFqSponge
traits using a sponge backed by keccak256.This sponge is explicitly designed to provide support for verification on the EVM, and so it builds a sponge out of the keccak256 hash function instead of using the keccak sponge directly.
This PR builds upon #1095, adding a test which exercises the BN128 pairing backend and the keccak sponge.