本代码是TEA加密算法的实现。其中，QQ登录在老版本中就是使用TEA算法实现加密。目前QQ加密已经升级不一定适用。但可以作为研究学习的入门材料。(This code is the implementation of the TEA encryption algorithm. Among them, QQ login in the old version is to use the TEA algorithm to implement encryption. At present, QQ encryption has been upgraded not necessarily. But it can be used as an introductory material for study.)