[JENKINS-72957] Amazon EC2 plugin support for algorithms other than RSA

Hello,

When will other ssh-keygen algorithms other than RSA be supported?  E.g.: ed25519

Ubuntu 22.04 has deprecated support for the RSA algorithm: 

https://askubuntu.com/questions/1409105/ubuntu-22-04-ssh-the-rsa-key-isnt-working-since-upgrading-from-20-04 

I'm going to have to downgrade our AMIs and that is problematic for software that we run on our instances that keep pace with more recent versions of Ubuntu.  

 

---
Originally reported by zellamsee, imported from: Amazon EC2 plugin support for algorithms other than RSA

• assignee: thoulen
  
• status: Open
  
• priority: Minor
  
• component(s): ec2-plugin
  
• label(s): RSA, SSH, Ubuntu, Ubuntu_22.04, ed25519
  
• resolution: Unresolved
  
• votes: 2
  
• watchers: 3
  
• imported: 2025-12-06
  

Raw content of original issue

Hello,


When will other ssh-keygen algorithms other than RSA be supported?  E.g.: ed25519


Ubuntu 22.04 has deprecated support for the RSA algorithm: 


https://askubuntu.com/questions/1409105/ubuntu-22-04-ssh-the-rsa-key-isnt-working-since-upgrading-from-20-04 


I'm going to have to downgrade our AMIs and that is problematic for software that we run on our instances that keep pace with more recent versions of Ubuntu.  


 

environment

```
Jenkins 2.452

EC2 Ubuntu Jammy 22.04 AMD 64
```

1 attachment

- [Screenshot 2024-04-02 at 5.00.29 PM.png](https://issues.jenkins.io/secure/attachment/62415/Screenshot%202024-04-02%20at%205.00.29%26%238239%3BPM.png)
> 

Start in the ec2-plugin repository by locating the handling of ssh-keygen and SSH key algorithms. Check how RSA is currently supported and verify the expected behavior for ed25519 on Ubuntu 22.04. Done means the plugin supports the requested non-RSA algorithm without requiring older AMIs.

Written by the indexing model from the issue text.