視頻上看到的例子，對(duì)著視頻打了一遍代碼，測(cè)試失敗，上網(wǎng)搜索后改了一下測(cè)試成功，不知道為什么跟視頻上打的一樣的代碼視頻上測(cè)試的正確而我的測(cè)試出錯(cuò)的，先不管了，先記下來(lái)，以備后用！

    
  /// <summary>字符串加解密
    /// 
    /// </summary>
    public class Encrypt
    {
        private SymmetricAlgorithm mCSP;
        private const string CIV = "oo*/^fsA";  //密鑰, 只能是8位
        private const string CKEY = "f123$dew"; //初始化向量， 只能是8位

        public Encrypt()
        {
            mCSP = new DESCryptoServiceProvider();
        }

        /// <summary>加密字符串
        /// 
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string EncryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;
            // 這里視頻上用的是Convert.FromBase64String(CKEY/CIV),但是我用的話總是出現(xiàn)錯(cuò)誤，什么大小不對(duì)
            ct = mCSP.CreateEncryptor(Encoding.ASCII.GetBytes(CKEY), Encoding.ASCII.GetBytes(CIV));
            byt = Encoding.UTF8.GetBytes(Value);
            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();
            return Convert.ToBase64String(ms.ToArray());
        }

        /// <summary>解密字符串
        /// 
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string DecryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;
            ct = mCSP.CreateDecryptor(Encoding.ASCII.GetBytes(CKEY), Encoding.ASCII.GetBytes(CIV));
            byt = Convert.FromBase64String(Value);

            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();

            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }

  

測(cè)試代碼：

    
        static void Main(string[] args)
        {
            Console.Write("請(qǐng)輸入要加密的字符串：");
            string str = Console.ReadLine();
            Console.WriteLine("加密后：" + new Encrypt().EncryptString(str));
            Console.ReadLine();

            Console.Write("請(qǐng)輸入要解密的字符串：");
            string str2 = Console.ReadLine();
            Console.WriteLine("解密后：" + new Encrypt().DecryptString(str2));
            Console.ReadLine();
        }

  

測(cè)試效果：

通過(guò)密鑰對(duì)字符串進(jìn)行加解密（C#）