Error on pushing to GitHub: SHA-1 Key

[sanjay-subskribe]

While pushing branch to GitHub repo, which is cloned using SSH, it fails with below error:

You're using an RSA key with SHA-1, which is no longer allowed.

The same action works fine from terminal.

GitUp version: 1.3.5

[lucasderraugh]

What key are you using to push to GitHub? The warning is valid and is what I'd expect if the keys being loaded in are for SHA-1. Are you sure you're loading your SSH keys correctly?

[sanjay-subskribe]

I am not sure how the keys are loaded by GitUp.
My key seems to be correct. It is set up at ~/.ssh/id_rsa.pub. it is using SHA256 and 3072 bytes long.
The git commands works correctly from terminal.

[lucasderraugh]

Have you looked at #35 for setting up the ssh key loading? Unfortunately our story for loading keys isn't great and needs some improvement, but there are some workarounds found there.

As an aside, GitHub recommends ed25519 be used rather than rsa.

So I would try first making sure the keys are being loaded by calling ssh-add --apple-use-keychain (optional -q for quiet mode), then launch GitUp and see if it works. If that doesn't work then you likely need to update your key, though I'm unsure why Terminal would work in that scenario.

[pertsevds]

I have the same problem.

I have an RSA key for old hosts that can't do modern crypto and ED25519 key for modern hosts.
In my ~/.ssh/config

Host github.com
  AddKeysToAgent yes
  UseKeychain yes
  UpdateHostKeys yes
  IdentityFile ~/.ssh/id_ed25519

I use ED25519 key as IdentityFile for Github, so SSH works in Terminal.
But when I try to fetch remote Github through GitUp it fails with this message You're using an RSA key with SHA-1, which is no longer allowed.

ssh-add --apple-use-keychain does not help.

How can I help to fix this issue.
AFAICS, this might be a libssh2 issue.

[pertsevds]

As a workaround
ssh-add -d ~/.ssh/id_rsa
did the trick.

[sanjay-subskribe]

I tried a few things, but this is not working for me!

1. I deleted ~/.ssh/id_rsa.pub. Terminal git push failed complaining Permission denied(publickey), but gitup gave the same error as shown in the screenshot above.
2. I updated /etc/ssh/ssh_config and specified a different location of ssh key for github.com. that worked for command line, but gitup continued to show the same error.
3. Tried ssh-add -d ~/.ssh/id_rsa. that also didnt work!

Any way, I am giving up now. Not gitup 😄 , just that I will use command line for git push!