Cannot parse privateKey: Unsupported key format

I recently updated my RSA public/private key to use the OpenSSH key format, the file now begins with:

-----BEGIN OPENSSH PRIVATE KEY-----

But while I don’t have any problem with other programs, ftp-remote-edit (a package for the Atom text editor: https://github.com/h3imdall/ftp-remote-edit) is the only software that has an issue and is giving me the error:

Cannot parse privateKey: Unsupported key format

I dived into the matter and found out the error was thrown by ssh2-stream’s keyParser module. Rather logical when reading the script, the header of my keyfile does not match any of the regular expressions.

To convert my key to the OpenSSH format I used:

ssh-keygen -f id_rsa -o -p -a 100

Converting it back to the old format can be done with:

ssh-keygen -f id_rsa -p -a 100

Which does indeed solve the issue, but the only problem is this will not work for my ED25519 keypairs since they only accept OpenSSH formatting.

[mscdex]

Full Ed25519 support now available in ssh2-streams v0.4.3 when used with node v12.0.0.

[mscdex]

FWIW ssh2-streams v0.3.0 now supports the “new” OpenSSH key format, but not ed25519 keys yet as that requires OpenSSL 1.1.1 which has not yet been incorporated into node core.