ssh connect will fail with exception if user has ed25519 identities in ssh_config

[mcr-ksh]

Describe the bug
cant connect to remote host when having ed25519 keys due to bug in jsch.

To Reproduce

1. add a ssh ed25519 key and "IdentityFile ~/.ssh/id_ed25519" to your ssh config.
2. open debugger and "GNU gdb via ssh"
3. ssh connection will fail will the following exception:

Caused by: com.jcraft.jsch.JSchException: invalid privatekey: [B@e4487af
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:407)
at com.jcraft.jsch.JSch.addIdentity(JSch.java:367)
at org.eclipse.jgit.transport.JschConfigSessionFactory.getJSch(JschConfigSessionFactory.java:276)
at org.eclipse.jgit.transport.JschConfigSessionFactory.createSession(JschConfigSessionFactory.java:220)
at org.eclipse.jgit.transport.JschConfigSessionFactory.createSession(JschConfigSessionFactory.java:176)
at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:110)

Expected behavior
can connect to remote host.

Workaround
use /etc/ssh/ssh_config and/or remove ed25519 keys.

Screenshots
see attachment.

Attachments
https://stackoverflow.com/questions/53134212/invalid-privatekey-when-using-jsch

Environment (please complete the following information):

• OS: macOS 12.2.1
  Build Date: 2022-Jan-25 1526 EST
  Ghidra Version: 10.1.2
  Java Home: /Library/Java/JavaVirtualMachines/openjdk17-temurin/Contents/Home
  JVM Version: Eclipse Adoptium 17.0.1
  OS: Mac OS X 11.2 x86_64

[d-millar]

Apologies for the slow response - is there a version of JSch that supports ed25519? I was under the impression that wasn't supported yet.

[5c4lar]

Apologies for the slow response - is there a version of JSch that supports ed25519? I was under the impression that wasn't supported yet.

One is mentioned here gradle/gradle#19028

[d-millar]

This looks promising - we’re considering it.