private void button1_Click(object sender, EventArgs e)
        {
            Encoding myE = Encoding.GetEncoding("utf-8"); ;
            string PwdSha=Get_SHA_Method1("123456").ToString();//SHA1
          
            string ns = Convert.ToBase64String(System.Text.ASCIIEncoding.Default.GetBytes(PwdSha));
            string miwen = Convert.ToBase64String(System.Text.ASCIIEncoding.Default.GetBytes("SHA" + ns));
            textBox1.Text = miwen;
            MessageBox.Show(miwen.Length.ToString());
        }






public string Get_SHA_Method1(string strSource)
        {
            //new
            System.Security.Cryptography.SHA1 sha = new System.Security.Cryptography.SHA1CryptoServiceProvider();
            //获取密文字节数组
            byte[] bytResult = sha.ComputeHash(System.Text.Encoding.Default.GetBytes(strSource));
            //转换成字符串，32位
            string strResult = BitConverter.ToString(bytResult);
            //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉
            strResult = strResult.Replace("-", "");
            return strResult;
        }

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