Convert a dRep extended vkey to a non-extended one:

[CarlosLopezDeLara]

cardano-cli conway key non-extended-key --extended-verification-key-file test.drep.vkey --verification-key-file /dev/stdout

Command failed: key non-extended-key  Error: Invalid key.

Originally posted by @gitmachtl in #352 (comment)

[smelc]

@CarlosLopezDeLara> in this case, the original extended drep key should be created as follows right?

cabal run cardano-cli -- conway governance drep key-gen \
--verification-key-file drep.vkey \
--signing-key-file drep.skey

[gitmachtl]

@smelc no need for cardano-cli to generate extended drep keys. they are coming into play if derived from the new path 1852'/1815'/acc'/3/idx'. typically from 3rd party tools like cardano-signer, spo-scripts, cardano-address, cardano-hw-cli.

https://github.com/Ryun1/CIPs/blob/conway-keys/CIP-conway-keys/README.md
cardano-foundation/CIPs#509

[CarlosLopezDeLara]

@smelc, as @gitmachtl rightly pointed out, extended keys typically come from Hierarchical deterministic (HD) key generation tools, so the cli doesn't generete them, just supports them.

In this case we want to be able to convert from extended to non-extended keys.

Additionaly, in #352 there is the need of support the use of extended keys directly on cli without having to convert them first.

[smelc]

@gitmachtl, @CarlosLopezDeLara> OK I see, thanks for the explanations 👍

As a first step, for this very specific issue, could one of you provide me with an example extended key (in your example Carlos the test.drep.vkey file)? Just so that I see if I can reproduce the issue locally, which will help me navigate what I need to do.

[gitmachtl]

@smelc you can simply copy the test key below and paste it into a textfile:

{
  "type": "DRepExtendedVerificationKey_ed25519_bip32",
  "description": "Delegate Representative Verification Key",
  "cborHex": "5840b0cd9e6e3e274f4f38f55ef274af123cf4600ac0c58294399b7e076175262553dde8b75f847f2b7e61a8748627292a06d739c8ba8e78ac83e666030d1093fb3e"
}

i have uploaded you the same file here if needed

[smelc]

Investigating this this morning. The offending code starts with the parser at Cardano/CLI/Legacy/Run/Key.hs#L53 then goes on with Cardano/CLI/EraBased/Run/Key.hs#L138. Finally it calls Cardano/CLI/Types/Key.hs#L251 at which point it goes to code in cardano-api.

[smelc]

Going into cardano-api, we find our friend deserializeAnyVerificationKey in cardano-api/internal/Cardano/Api/DeserialiseAnyOf.hs#L299 and finally we find in cardano-api/internal/Cardano/Api/Keys/Shelley.hs#L1493 that there is no Extended version of DRepKey, which is likely the crux of the problem.

I know need to figure out how it's formally defined, so that I can add the corresponding code.

[gitmachtl]

@Ryun1 @CarlosLopezDeLara i think we had this in a pr from you. also its in the cip-conway-keys: https://github.com/Ryun1/CIPs/blob/conway-keys/CIP-conway-keys/README.md