Simplify DES (S-DES).

des加密的简化c语言编程，完整的步骤和过程。-des c programming language to simplify encryption, complete the steps and processes.

本代码提供了一个封装类，将OPENSSL提供的RSA1024加解密算法重新封装，简化输入输出参数，实现SHA1摘要、密钥导入导出、RSA签名、验证、加密、解密等基本功能，可直接引用到软件项目中使用，编译时另需要libeay32.lib的支持，请自行编译OPENSSL1.0.0b-This code provides a wrapper class, the OPENSSL provides the RSA1024 encryption algorithm to re package, simpl