Lua MD5加密字符串

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