DES的S-盒完整代码。用于求解DES的布尔函数-s-box of DES

SPN加密解密，有短块处理，采用相同的S盒，能完成基本的加密解密功能，大致就是这样的啦-SPN encryption and decryption, with short block processing, using the same S-box, to complete the basic encryption and decryption functions, so it generally is