md5

 

    public class DataSetFormat
    {
        /// <summary>
        /// 序列化DataSet
        /// </summary>
        /// <param name="dataSet">需要序列化的DataSet</param>
        /// <returns>序列化后的byte数组</returns>
        public static byte[] DataSetToByte(DataSet dataSet)
        {
            //通过dataset创建DataSetSurrogate对象
            DataSetSurrogate surrogate = new DataSetSurrogate(dataSet);
            MemoryStream str = new MemoryStream();
            BinaryFormatter bf = new BinaryFormatter();
            //将DataSetSurrogate实例转化成内存流
            bf.Serialize(str, surrogate);
            return str.ToArray();
        }

        /// <summary>
        /// 反序列化DataSet
        /// </summary>
        /// <param name="dsByte">Byte数组</param>
        /// <returns>DataSet</returns>
        public static DataSet ByteToDataSet(byte[] dsByte)
        {
            //将byte数组转化成内存流
            MemoryStream str = new MemoryStream(dsByte);
            BinaryFormatter bf = new BinaryFormatter();
            //将内存流转化成object对象
            object o = bf.Deserialize(str);
            //强行转化成DataSetSurrogate实例
            DataSetSurrogate surrogate = (DataSetSurrogate)o;
            //通过DataSetSurrogate转化成DataSet
            return surrogate.ConvertToDataSet();
        }
    }

    /// <summary>
    /// 加密类
    /// </summary>
    public class Encrypt
    {
        #region 加密参数

        /// <summary>
        /// DES密钥
        /// </summary>
        private static string KEY = "PQTadmin";
        /// <summary>
        /// DES密鈅
        /// </summary>
        public static string Key
        {
            set
            {
                if (KEY != value)
                {
                    KEY = value;
                }
            }
        }

        /// <summary>
        /// DES初始化向量
        /// </summary>
        private static string IV = "PQTUnica";
        /// <summary>
        /// DES初始化向量
        /// </summary>
        public static string Iv
        {
            set
            {
                if (IV != value)
                {
                    IV = value;
                }
            }
        }

        #endregion

        #region MD5算法

        /// <summary>
        /// 采用MD5加密方式，不可逆
        /// </summary>
        /// <param name="buffer">加密字符串</param>
        /// <returns>加密后串</returns>
        public static string MD5Encrypt(string buffer)
        {
            // 创建MD对象
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            // 加密字符串
            byte[] encryptBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(buffer));

            //对加密出来的byte转换成字符串
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < encryptBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptBytes[i]);
            }

            return sb.ToString();
        }

        #endregion

        #region DES算法

        /// <summary>
        /// 采用DES加密算法
        /// </summary>
        /// <param name="buffer">被加密串</param>
        /// <returns></returns>
        public static string DESEncrypt(string buffer)
        {
            // 定义对称算法类的实例
            SymmetricAlgorithm symmetric;
            // 加密接口实例
            ICryptoTransform crypto;
            MemoryStream mstream;
            // 加密流
            CryptoStream cstream;
            byte[] bufferbyte;

            // 设置SymmetricAlgorithm参数
            symmetric = new DESCryptoServiceProvider();
            symmetric.Key = Encoding.UTF8.GetBytes(KEY);
            symmetric.IV = Encoding.UTF8.GetBytes(IV);
            // 初始化ICryptoTransform接口
            crypto = symmetric.CreateEncryptor();

            // 将被加密串二进制化
            bufferbyte = Encoding.UTF8.GetBytes(buffer);

            // 通过ICryptoTransform实例创建加密流对象
            mstream = new MemoryStream();
            cstream = new CryptoStream(mstream, crypto, CryptoStreamMode.Write);

            // 加密数据
            cstream.Write(bufferbyte, 0, bufferbyte.Length);
            cstream.FlushFinalBlock();
            cstream.Close();

            // 返回加密后的串
            return Convert.ToBase64String(mstream.ToArray());
        }

        /// <summary>
        /// 采用DES解密算法
        /// </summary>
        /// <param name="buffer">被DES加密的串</param>
        /// <returns>解密后的串</returns>
        public static string DESDecrypt(string buffer)
        {
            // 定义对称算法类的实例
            SymmetricAlgorithm symmetric;
            // 加密接口实例
            ICryptoTransform crypto;
            MemoryStream mstream;
            // 加密流
            CryptoStream cstream;
            byte[] bufferbyte;

            // 设置SymmetricAlgorithm参数
            symmetric = new DESCryptoServiceProvider();
            symmetric.Key = Encoding.UTF8.GetBytes(KEY);
            symmetric.IV = Encoding.UTF8.GetBytes(IV);
            // 初始化ICryptoTransform接口
            crypto = symmetric.CreateDecryptor();

            // 将串转化成byte数组
            bufferbyte = Convert.FromBase64String(buffer);

            // 通过ICryptoTransform实例创建加密流对象
            mstream = new MemoryStream();
            cstream = new CryptoStream(mstream, crypto, CryptoStreamMode.Write);

            // 加密数据
            cstream.Write(bufferbyte, 0, bufferbyte.Length);
            cstream.FlushFinalBlock();
            cstream.Close();

            // 返回解密后的串
            return Encoding.UTF8.GetString(mstream.ToArray());
        }

        #endregion
    }