keccak256 alternatives

[70nyIT]

I need to verify the merkle root hash within a circuit. That hash is also onChain and it's one of the public inputs to my circuit. I've seen that keccak256 hash function has been deprecated. What do you suggest to write a circuit that needs to verify that from a leaf (private input) we get up to the root hash (public input)?

[Savio-Sou]

Keccak256 is not deprecated, you can find it here: https://github.com/noir-lang/keccak256

[Savio-Sou]

Can you share where is it shown deprecated? Would love to get that fixed.

[70nyIT]

Yup - I was importing like I used to do from STD library (but was getting an error) and searching through your commits I found a commit that was saying "deprecating keccak256" - that I think was one of the build in preparation for the 1.0.0 release.
With the repo you suggested I was able to have it work - THANKS! It was weird as also in the docs is not mentioned anywhere this package (even if keccak256 is critical when dealing with blockchain) so I thought was somehow removed.

[Savio-Sou]

Thank you, that's very helpful feedback 👍
We have to do better at promoting https://github.com/noir-lang/awesome-noir/#libraries as the place for libraries!

[70nyIT]

oh wow - yes! Didn't know all those libraries were available!! Suggestion: in the Docs , maybe in the menu "The Noir Language", below "Modules, Packages and Crates" you can add "Libraries" as a direct external link to the link you pasted above.