That’s not a valid key. OpenSSH keys are not arbitrary bytes, they contain at least the type of the certificate used and a hostname.
The fact that this is not a valid key does not mean you need to reverse engineer public keys. By design you can just get a public key with a private one.
Now reverse engineer a matching public key.
What do you mean “reverse engineer”? From
man ssh-keygen:-y This option will read a private OpenSSH format file and print an OpenSSH public key to stdout.Post the output when you run that on the key that was posted.
That’s not a valid key. OpenSSH keys are not arbitrary bytes, they contain at least the type of the certificate used and a hostname.
The fact that this is not a valid key does not mean you need to reverse engineer public keys. By design you can just get a public key with a private one.