OpenSSL整个软件包大概可以分成三个主要的功能部分：密码算法库、SSL协议库以及应用程序。OpenSSL的目录结构自然也是围绕这三个功能部分进行规划的。

作为一个基于密码学的安全开发包，OpenSSL提供的功能相当强大和全面，囊括了主要的密码算法、常用的密钥和证书封装管理功能以及SSL协议，并提供了丰富的应用程序供测试或其它目的使用。-OpenSSL is probably the entire package can be divided into three major functional components: cryptographic algorithm library, SSL protocol libraries and applications. OpenSSL directory structure around these three functions naturally part of planning. As a cryptography-based security development kits, OpenSSL provides quite powerful and comprehensive, covering the major cryptographic algorithms, commonly used key and certificate management functions as well as the SSL protocol encapsulation, and provides a rich set of applications for testing or other purposes.