常用的Openssl编写学习资料，很适合初学者使用。-Commonly used OpenSSL preparation of learning materials, it is suitable for beginners to use.

SHA-1 produces a message digest based on principles similar to those used by Ronald L. Rivest of MIT in the design of the MD4 and MD5 message digest algorithms, but has a more conservative design.SHA-2 is a set of cryptographic hash functions (SHA-22

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-Major cryptographic algorithms commonly used function key and certificate management and SSL protocol encapsulation, and provides a wealth of applications for testing or other purposes