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To be able to successfully connect using SSH keys we need to have the private key on the client side and the public key set on the server side (where we want to connect). If we only have the private key, we can generate a public SSH key from it
Assuming we have the private key as private_key.pem we just need to use ssh-keygen the following flags:
So the command would look like this:
$ ssh-keygen -yf private_key.pem ssh-rsa AAAAQABAAABA...
The public will be print to stdout, so if we want to write it to a file we can just redirect it's output like this:
$ ssh-keygen -yf private_key.pem > public_key.pem
Posted on 24/12/2021