A Guide to the Most Frequently UsedOpenSSL Features and Commands.For all its warts, OpenSSL is one of the most successful and most important open sourceprojects. It’s successful because it’s so widely used; it’s important because the security of largeparts of the Internet infrastructure relies on it. The project consists of a high-performanceimplementation of key cryptographic algorithms, a complete SSL/TLS and PKI stack, and acommand-line toolkit. I think it’s safe to say that if your job has something to do with security,web development, or system administration, you can’t avoid having to deal with OpenSSLon at least some level. The majority of the Internet is powered by open source products, andvirtually all of them rely on OpenSSL.This book covers two ways in which OpenSSL can be used. Chapter 1( OpenSSL) will help userswho need to perform routine tasks of key and certificate generation, and configure programsthat rely on OpenSSL for SSL/TLS functionality. This chapter also discusses how to createa complete private CA, which is useful for development and similar internal environments.Chapter 2(Testing with OpenSSL) focuses on server security testing using OpenSSL. Althoughsometimes time consuming, this type of low-level testing can’t be avoided when you wish toknow exactly what’s going on.