DES 算法加密/解密源码

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    class Program
    {
        static void Main(string[] args)
        {
            string value = null;
            string jeiguo = null;
            while (true)
            {
                Console.WriteLine("1:加密，2：解密，3：关闭");
                string shuru = Console.ReadLine();
                switch (shuru)
                {
                    case "1":
                        Console.WriteLine("请输入加密内容：");
                        value = Console.ReadLine();
                        jeiguo = PasswordHelper.DESEncrypt(value);
                        Console.WriteLine("结果：" + jeiguo.ToString());
                        break;
                    case "2":
                        Console.WriteLine("请输入解密内容：");
                        value = Console.ReadLine();
                        jeiguo = PasswordHelper.DESDecrypt(value);
                        Console.WriteLine("结果：" + jeiguo.ToString());
                        break;
                    case "3":
                        return;
                }
            }
        }
    }

public static class PasswordHelper
    {
        #region DES 加密/解密

        private static byte[] key = ASCIIEncoding.ASCII.GetBytes("uiertysd");
        private static byte[] iv = ASCIIEncoding.ASCII.GetBytes("99008855");

        /// 

        /// DES加密。
        /// 
        /// 输入字符串。
        /// 加密后的字符串。
        public static string DESEncrypt(string inputString)
        {
            MemoryStream ms = null;
            CryptoStream cs = null;
            StreamWriter sw = null;

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                ms = new MemoryStream();
                cs = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);
                sw = new StreamWriter(cs);
                sw.Write(inputString);
                sw.Flush();
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
            }
            finally
            {
                if (sw != null) sw.Close();
                if (cs != null) cs.Close();
                if (ms != null) ms.Close();
            }
        }

        /// 

        /// DES解密。
        /// 
        /// 输入字符串。
        /// 解密后的字符串。
        public static string DESDecrypt(string inputString)
        {
            MemoryStream ms = null;
            CryptoStream cs = null;
            StreamReader sr = null;

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                ms = new MemoryStream(Convert.FromBase64String(inputString));
                cs = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);
                sr = new StreamReader(cs);
                return sr.ReadToEnd();
            }
            finally
            {
                if (sr != null) sr.Close();
                if (cs != null) cs.Close();
                if (ms != null) ms.Close();
            }
        }

        #endregion
    }