Typical key management with OpenSSL

Generate private key:

openssl genrsa -aes128 -passout pass:foobar -out privkey.pem 2048

Extract public key from private key:

openssl rsa -pubout -in privkey.pem -out pubkey.pem

Display data from the key file:

openssl rsa -text -in private_key.pem

Remove the key proteccion.

openssl rsa -in [file1.key] -out [file2.key]