.NET中的加密解密：私钥加密（对称加密）：DES

 

    public class DesSample
    {
        DES des = null;

        public DesSample(byte[] bKey)
        {
            des = new DESCryptoServiceProvider();
            des.Key = bKey;
            des.IV = bKey;
        }

        public string Encrypt(string data)
        {
            try
            {
                byte[] bData = Encoding.UTF8.GetBytes(data);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
                cs.Write(bData, 0, bData.Length);
                cs.FlushFinalBlock();

                return Convert.ToBase64String(ms.ToArray());
            }
            catch
            {
                throw;
            }
        }

        public string Decrypt(string data)
        {
            try
            {
                byte[] bData = Convert.FromBase64String(data);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(bData, 0, bData.Length);
                cs.FlushFinalBlock();

                return Encoding.UTF8.GetString(ms.ToArray());
            }
            catch
            {
                throw;
            }
        }

    }//class DesSample


    class Program
    {
        static void Main(string[] args)
        {
            
            byte[] bKey8 = UTF8Encoding.UTF8.GetBytes("12345678");
            string data = "Hello,I am Jie.";

            Console.WriteLine("Des Sample");
            DesSample des = new DesSample(bKey8);
            string desData = "";
            desData = des.Encrypt(data);
            Console.WriteLine("DES Encrypt:{0}", desData);
            Console.WriteLine("DES Decrypt:{0}", des.Decrypt(desData));
            Console.WriteLine();

            Console.Read();
        }
    }