RFC8410 (in)compatibility

Weijun Wang WEIJUN.WANG at ORACLE.COM
Fri Aug 28 13:58:32 UTC 2020


Is “Ed25519” what you need? It’s not available in JDK 11. See https://bugs.openjdk.java.net/browse/JDK-8199231.

—Max

> On Aug 28, 2020, at 9:55 AM, Anders Rundgren <anders.rundgren.net at gmail.com> wrote:
> 
> On 2020-08-28 15:41, Weijun Wang wrote:
>> What version of java are you using and what’s your command to generate the key pair?
> 
> Hi Max,
> 
> While waiting for JDK 15, I'm currently using JDK11 and BC but the question is really about the Signature object specification.
> 
>  KeyPairGenerator kpg = KeyPairGenerator.getInstance("X25519")
>  KeyPair kp = kpg.generateKeyPair();
> 
> A self-signed X25519 certificate would require that a X25519 key is useful as a signature key.
> 
> Note: I'm not proposing such a feature, I'm just trying to understand :)
> 
> Regards,
> Anders
>> Thanks,
>> Max
>>> On Aug 28, 2020, at 7:03 AM, Anders Rundgren <anders.rundgren.net at gmail.com> wrote:
>>> 
>>> Hi Crypto Experts,
>>> 
>>> Please pardon my ignorance regarding curve25519, but I ran into problems [*] trying to recreate the sample certificate:
>>> https://urldefense.com/v3/__https://tools.ietf.org/html/rfc8410*section-10.2__;Iw!!GqivPVa7Brio!OMTnVBdbrt8MuV8YwHsti8iuWLk2QE3C6FGAQeBoMJj9pIBQiRO6cbcSLzY8F_90TQ$ 
>>> 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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