How to Generate & Use Private Keys using OpenSSL's Command Line Tool
These commands generate and use private keys in unencrypted binary (not Base64 “PEM”) PKCS#8 format. The PKCS#8 format is used here because it is the most interoperable format when dealing with software that isn't based on OpenSSL.
OpenSSL has a variety of commands that can be used to operate on private
key files, some of which are specific to RSA (e.g.
openssl rsa and
openssl genrsa) or which have other limitations. Here we always use