Fixing OpenSSL 1.1.1 creates default key as OPENSSL issue
OpenSSL 1.0.1 used to create private key by default with type "RSA PRIVATE" but with new OpenSSL version 1.1.1 this got changed and now it started creating default key as "OPENSSH PRIVATE".
Any existing where these keys are getting used as RSA PRIVATE starts failing, to resolve this issue we can do below:
Use "-m PEM" as an option in the ssh-keygen command as below:
Example Code Snippet
ssh-keygen -m PEM -t rsa -f keyfile.key