说明：  C51可用的AES加解密算法，只支持128位加解密，在实际项目中应用，网上较多见的是C++程序，在C51和类似内存资源较少的单片机无法使用，绝对可用。
(C51 AES encryption and decryption algorithms available, which only supports 128-bit encryption and decryption, in actual application of the project, the online is more to see C++ program, similar in C51 and fewer single-chip memory resources can not be used, absolutely free.)