I would like to get a custom signature from a wallet. What I mean is, according to EIP-712 the signature algorithm used in Ethereum is kekkac256; I would like instead to use a custom signature algorithm in order to create a valid JSON web signature. Is there a way to do it wihtout directly asking the private key to the wallet owner?

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I think you would need to write a custom function. For example, related python and javascript code has the keccak baked in.

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