gno code to derive address from public key

[jefft0]

There is go code to derive the address from a public key. This implements the Address method of the PubKey interface. But there is not equivalent gno code. This would be useful, for example, in the valopers realm to check that the registered public key corresponds to the address. This would require implementing the dependent hash functions in gno code. We need to decide whether this is too expensive to do in the gno VM.

[moul]

What usage do you see specifically in gno?

Checking whether a public key matches an address is done where it matters, in tm2. Do you see any other advantages besides simply having checked printed values in markdown?

[jefft0]

This came up while discussing registration in the valopers PR #3830 . The use case: someone asked to validate the address against the public key. I pointed out that there is no code in gno to derive the address from the public key, and I was asked to make a tracking issue to discuss it. I agree that it's too expensive to put hashing code in gno. If you feel this issue has been discussed enough, you can close it.

[moul]

I think we should not ask for public keys from validators at all, only addresses. However, let's allow people to add a public key if we want it for now, as this may help us generate better configuration files from the realm temporarily.

[jefft0]

As mentioned in the comment on PR 4029, we don't have a need for this right now. I'm closing this issue for now so that someone else doesn't take the time to write a PR. We can open later if needed.