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https://issues.apache.org/jira/browse/SSHD-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134985#comment-17134985
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Matt Sicker commented on SSHD-704:
----------------------------------
I started looking into how this could be implemented, and figuring out an
appropriate API to use for obtaining the {{u}} value from the X25519 public key
either requires using
[XECPublicKeySpec|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/security/spec/XECPublicKeySpec.html]
or what I can assume is the [proper API in
Bouncycastle|https://www.bouncycastle.org/docs/docs1.5on/org/bouncycastle/crypto/params/X25519PublicKeyParameters.html]
to get the already encoded version of that. I tried using the encoded form of
the key from the {{KeyPairGenerator}}, but the public key is returned as an
X.509 key, and converting that to the spec class is a Java 11 API.
> Add support for [email protected] key exchange
> ----------------------------------------------------------
>
> Key: SSHD-704
> URL: https://issues.apache.org/jira/browse/SSHD-704
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 1.4.0
> Reporter: Lyor Goldstein
> Priority: Major
> Labels: features
> Attachments: Curve25519.java, Curve25519SHA256AbstractDH.java,
> Curve25519SHA256DHFactory.java, Curve25519SHA256KeyExchange.java,
> Curve25519SHA256KeyExchangeFactory.java
>
>
> See
> * [[email protected] kexy exchange
> specification|https://git.libssh.org/projects/libssh.git/tree/doc/[email protected]]
> * [Secure Shell (SSH) Key Exchange Method using Curve25519 and
> Curve448|https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves-06]
> * [JEP 324: Key Agreement with Curve25519 and
> Curve448|http://openjdk.java.net/jeps/324]
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