asp.net md5加密

public string md5(string str,int code){ if(code==16) //16位MD5加密（取32位加密的9~25字符） { return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5").ToLower().Substring(8,16) ; } else//32位加密 { return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5").ToLower(); } }