What version of java are you using and what’s your command to generate the key 
pair?

Thanks,
Max

> On Aug 28, 2020, at 7:03 AM, Anders Rundgren <anders.rundgren....@gmail.com> 
> wrote:
> 
> Hi Crypto Experts,
> 
> Please pardon my ignorance regarding curve25519, but I ran into problems [*] 
> trying to recreate the sample certificate:
> https://tools.ietf.org/html/rfc8410#section-10.2
> 
> It seems that the certificate is signed with a key intended for ECDH.
> Question: is Java's "Signature" object supposed to accept X25519 keys?
> 
> Personally I don't see any use of a self-signed encryption certificate so 
> maybe this is just a bad example...kind of edge case.
> 
> Regards,
> Anders Rundgren
> 
> *] java.security.InvalidKeyException: cannot identify EdDSA private key

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