C# MD5加密字符串

MD5加密字符串

using System.Security.Cryptography;
static 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();
    }
}