//SHA1        static public string SHA1_Hash(string str_sha1_in)        {            SHA1 sha1 = new SHA1CryptoServiceProvider();            byte[] bytes_sha1_in = UTF8Encoding.Default.GetBytes(str_sha1_in);            byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in);            string str_sha1_out = BitConverter.ToString(bytes_sha1_out);            //str_sha1_out = str_sha1_out.Replace("-", "");            return str_sha1_out;        }