Encrypt Decrypt

encryptstring

                DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
                byte[] key = System.Text.Encoding.Unicode.GetBytes(encryptkey);
                byte[] data = System.Text.Encoding.Unicode.GetBytes(encryptstring);
                MemoryStream ms = new MemoryStream();//存储加密后的数据
                CryptoStream cs = new CryptoStream(ms, desc.CreateEncryptor(key, key), CryptoStreamMode.Write);
                cs.Write(data, 0, data.Length);//进行加密
                cs.FlushFinalBlock();
                strRtn = Convert.ToBase64String(ms.ToArray());
                return strRtn;

decryptstring

                DESCryptoServiceProvider desc = new DESCryptoServiceProvider();
                byte[] key = System.Text.Encoding.Unicode.GetBytes(encryptkey);
                byte[] data = Convert.FromBase64String(decryptstring);
                MemoryStream ms = new MemoryStream();//存储解密后的数据
                CryptoStream cs = new CryptoStream(ms, desc.CreateDecryptor(key, key), CryptoStreamMode.Write);
                cs.Write(data, 0, data.Length);//解密数据
                cs.FlushFinalBlock();
                strRtn = System.Text.Encoding.Unicode.GetString(ms.ToArray());
                return strRtn;