RijndaelManaged 加密

 public  string Encrypt(string str)
        {
            string result = null;
            if (str == null)
            {
                return result;
            }
            try
            {
                byte[] array0 = Encoding.ASCII.GetBytes(str);
                MemoryStream stream = new MemoryStream(array0);
                RijndaelManaged rijndaelManaged = new RijndaelManaged();
                byte[] key = new byte[] { , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  };
                byte[] vi = new byte[] { , , , , , , , , , , , , , , ,  };

                ICryptoTransform transform = rijndaelManaged.CreateEncryptor(key, vi);
                CryptoStream cryptoStream = new CryptoStream(stream, transform, CryptoStreamMode.Write);
                result = cryptoStream.ToString();
                cryptoStream.FlushFinalBlock();
                return result;
            }
            catch
            {
                return null;
            }
        }

        public  string Decode(string str)
        {
            string result = null;
            if (str == null)
            {
                return result;
            }

            try
            {
                byte[] array0 = Encoding.ASCII.GetBytes(str);
                MemoryStream stream = new MemoryStream(array0);
                RijndaelManaged rijndaelManaged = new RijndaelManaged();
                byte[] key = new byte[] { , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  };
                byte[] vi = new byte[] { , , , , , , , , , , , , , , ,  };

                ICryptoTransform transform = rijndaelManaged.CreateEncryptor(key, vi);
                CryptoStream inStream = new CryptoStream(stream, transform, CryptoStreamMode.Read);
                return inStream.ToString();
            }
            catch
            {
                return null;
            }
        }

1.代码中key和vi分别对应加密器对象Key和初始化向量 (IV)

2.Key和VI只有完全匹配得上加密数据才可以被解密