openssl genpkey generates a private key. $ openssl genpkey -out the.key -algorithm RSA $ cat the.key -----BEGIN PRIVATE KEY----- MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDd+IKR9wyKI5jp Yy4abfvcuDebil4av4P7qh1qykOZE5L0MYaAL0pXsC7iYu1/dZSGpqiR0xigwDFQ … -----END PRIVATE KEY-----
genrsa, gendsa