Question about the EdDSA example on the play ground.

[beegmon]

I am trying to tweak the playground example EdDSA to use compressed PublicKey and Signatures as circuits inputs vs the present X/Y, an X/Y/S inputs.

I am also very new to go in general so that probably isn't helping me either here.

Looking at eddsa.PublicKey/Signature there are helper functions that take in a buf that is a compressed version of the input and sets X/Y and X/Y/S.

type Circuit struct {
	PublicKey eddsa.PublicKey   `gnark:",public"`
	Signature eddsa.Signature   `gnark:",public"`
	Message   frontend.Variable `gnark:",public"`
}

That is struct used the example and I assumed (wrongly) I could do something like:

type Circuit struct {
	PublicKey eddsa.PublicKey.Assign(tewards.BN254, PublicKey)   `gnark:",public"`
	Signature eddsa.Signature .Assign(tewards.BN254, Signature)  `gnark:",public"`
	Message   frontend.Variable `gnark:",public"`
}

That is very obviously wrong but I am struggling on how to figure out how to convert my input which is compressed in a hex string to th needed X/Y and X/Y/R values to feed into the circuit example.

[ivokub]

So, if you want to define the witness in the playground then in the end of the text input area there is a JSON object which you can use to submit the witness. The values in the playground must already be deserialized into primitive native field elements.

Usually in the application which integrates gnark you can do pre-processing to obtain the required format. Playground doesn't provide this option for simplicity.