说明：  MD5校验和计算小程序。C编写，实现字符串摘要、文件摘要两个功能。 里面主要包含3个文件: Md5.cpp、Md5.h、Main.cpp。其中Md5.cpp是算法的代码，里的代码大多是从 rfc-1321 里copy过来的；Main.cpp是主程序。
(MD5 checksum calculation applet. C to prepare and achieve string summary document containing a summary of two functions. Which mainly contains three documents: Md5.cpp, Md5.h, Main.cpp. Md5.cpp which is the algorithm code, in most of the code from the rfc-1321-ri copy back Main.cpp is the main program.)