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   源码介绍

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        #region 解密
        private void btnStr_Click(object sender, EventArgs e)
        {
            txtShow.Text = Decode(txtRedKey.Text, txtKey.Text, txtIV.Text);
        }

        //解密
        public static string Decode(string data, string Key_64, string Iv_64)
        {
            string KEY_64 = Key_64;// "VavicApp";密钥
            string IV_64 = Iv_64;// "VavicApp"; 向量
            try
            {
                byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
                byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
                byte[] byEnc;
                byEnc = Convert.FromBase64String(data); //把需要解密的字符串转为8位无符号数组
                DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
                MemoryStream ms = new MemoryStream(byEnc);
                CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
                StreamReader sr = new StreamReader(cst);
                return sr.ReadToEnd();
            }
            catch (Exception x)
            {
                return x.Message;
            }
        }
        #endregion