Learn a public key is always contained inside the private key, you can get that public key using openssl anytime. Read extracting public key and ssh-public key generation from private file in cli at https://stackoverflow.com/a/5246045/10012446. Read how private-public keys work together here.
# Simple ssh keys generation: ssh-keygen #Note if you give filename as myfile, then output will be: myfile and myfile.pub, where myfile is private key and myfile.pub is public key. # Generating sshkyes using github recommended algorithm: ssh-keygen -t ed25519 -C "firstname.lastname@example.org" # Note: If you are using a legacy system that doesn't support the Ed25519 algorithm, use: ssh-keygen -t rsa -b 4096 -C "email@example.com" # Generate myfile.ppk and myfile.ppk.pub (With no prompts for filename, and do set passphrase in prompts): ssh-keygen -f myfile.ppk # Output: Two files will be generated i.e, priv key and public key respectively. # myfile.ppk myfile.ppk.pub