function md5_sumhexa(k) local md5_core = require "md5.core" k = md5_core.sum(k) return (string.gsub(k, ".", function (c) return string.format("%02x", string.byte(c)) end ) ) end print(md5_sumhexa("Hello World!"))
md5.core.dll 是Windows平台二进制文件，下载地址：http://pan.baidu.com/s/1dDGkQ7B
原文：http://www.cnblogs.com/zhuawang/p/6720274.html