C#中的DES加密

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace DES_Encryption_Example
{
    class Program
    {
        static void Main(string[] args)
        {
            string original = "This is a test message.";
            string key = "1234567890123456"; // 56位密钥

            // 加密
            string encrypted = Encrypt(original, key);
            Console.WriteLine("Encrypted: " + encrypted);

            // 解密
            string decrypted = Decrypt(encrypted, key);
            Console.WriteLine("Decrypted: " + decrypted);
        }

        static string Encrypt(string plainText, string key)
        {
            byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
            byte[] keyBytes = Encoding.UTF8.GetBytes(key);

            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(keyBytes, null), CryptoStreamMode.Write))
                    {
                        cs.Write(plainBytes, 0, plainBytes.Length);
                        cs.FlushFinalBlock();
                    }

                    return Convert.ToBase64String(ms.ToArray());
                }
            }
        }

        static string Decrypt(string cipherText, string key)
        {
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            byte[] keyBytes = Encoding.UTF8.GetBytes(key);

            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(keyBytes, null), CryptoStreamMode.Write))
                    {
                        cs.Write(cipherBytes, 0, cipherBytes.Length);
                        cs.FlushFinalBlock();
                    }

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