No support for ED25519 keys (replace JSCH library)

[sratz]

gerrit-events does not support ED25519 keys:

    com.sonymobile.tools.gerrit.gerritevents.ssh.SshException: com.jcraft.jsch.JSchException: invalid privatekey: [B@5e887fa3
        at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionImpl.connect(SshConnectionImpl.java:200)
        at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionFactory.getConnection(SshConnectionFactory.java:140)
        at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionFactory.getConnection(SshConnectionFactory.java:117)
        at com.sonymobile.tools.gerrit.gerritevents.GerritConnection.connect(GerritConnection.java:498)
        at com.sonymobile.tools.gerrit.gerritevents.GerritConnection.run(GerritConnection.java:404)
    Caused by: com.jcraft.jsch.JSchException: invalid privatekey: [B@5e887fa3
        at com.jcraft.jsch.KeyPair.load(KeyPair.java:664)
        at com.jcraft.jsch.KeyPair.load(KeyPair.java:561)
        at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:40)
        at com.jcraft.jsch.JSch.addIdentity(JSch.java:406)
        at com.jcraft.jsch.JSch.addIdentity(JSch.java:387)
        at com.sonymobile.tools.gerrit.gerritevents.ssh.SshConnectionImpl.connect(SshConnectionImpl.java:168)
        ... 4 more

This is because the JSCH library does not.

Since JSCH seems not to be maintained anymore, it should be considered to switch to an alternative SSH library, e.g. Apache MINA.

[Apteryks]

Cross-linking to the Gerrit Trigger issue: https://issues.jenkins.io/browse/JENKINS-67563.

[rsandell]

Sure, Apache MINA is already used in test scope. Though it might cause some issues in runtime due to a core dependency on the same library.

[patbaumgartner]

I came across this today https://www.matez.de/index.php/2020/06/22/the-future-of-jsch-without-ssh-rsa/ and realized that ED25519 is implemented in https://github.com/mwiede/jsch - which should be a drop-in replacement ...