如：md5('abc')=xxxxxxxxxxxxxxxxxxxx 怎么跟据“XXXXXXXXXXXXXXXXXXXXX”来反求出‘abc"呢？ -================================- 以下附MD5代码 http://www.fichtner.net/delphi/md5.delphi.phtml?download=md5.pas

You cannot. MD5 is irreversible. Consider you can get a MD5 from a huge file, it is very clear that you cannot generate the whole file using the MD5 hash value.