C#字符串DES加密和解密

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

namespace Demo
{
    class Program
    {

        private static byte[] Keys = { 0x22, 0x34, 0x76, 0x58, 0x90, 0xAB, 0xAD, 0xBF };

        private static string EncryptionKey = "LHdpz520";

        static void Main(string[] args)
        {
            string encryptStr = EncryptDES("Hello DES Encryption World!", EncryptionKey);  //返回加密后的字符串
            Console.WriteLine("\n=====================================\n");
            Console.WriteLine($"加密后：\"{encryptStr}\"");
            string decryptStr = DecryptDES(encryptStr, EncryptionKey);    //解密字符串
            Console.WriteLine("\n=====================================\n");
            Console.WriteLine($"解密后：\"{decryptStr}\"");
            Console.ReadLine();
        }

        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串 </returns>
        public static string EncryptDES(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));//转换为字节
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();//实例化数据加密标准
                MemoryStream mStream = new MemoryStream();//实例化内存流
                //将数据流链接到加密转换的流
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES(string decryptString, string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }
    }
}