Generate a new private key
openssl genrsa -out <path> 2048
Change file permission
chmod go-rwx ~/.oci/oci_api_key.pem
Generate the public key from your new private key
openssl rsa -pubout -in <path_private> -out <path public>
Get key fingerprint
openssl rsa -pubout -outform DER -in ~/.oci/oci_api_key.pem | openssl md5 -c