DES加密解密类，给大家一个算法的参考。希望新手一点启示。-DES encryption and decryption class, give us an algorithm for reference. Hope novice of this problem.

源码是一个CDES类，纯C++写的，包含Single Des和Triple Des算法， 内涵DES算法的所有详细流程，可供信息安全初学者学习交流使用。-Source is a CDES class, written in pure C++, including the Single Des and Triple Des algorithm, meaning all the detailed process of DES algorithm, for beginners to learn to