Core DES加、解密

安装 Portable.BouncyCastle Nuget包

地址：https://www.nuget.org/packages/Portable.BouncyCastle/

Install-Package Portable.BouncyCastle

 

 using Org.BouncyCastle.Crypto;
 using Org.BouncyCastle.Crypto.Engines;
 using Org.BouncyCastle.Crypto.Modes;
 using Org.BouncyCastle.Crypto.Paddings;
 using Org.BouncyCastle.Crypto.Parameters;
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;

 namespace ConsoleAppDES
 {
     class Program
     {
         public static string desData = "fu kai hang";
         public static string desKey = "";
         public static string desIV = "";
         static void Main(string[] args)
         {
             var encrypt = DESHelper.EncryptDES(desData, desKey, desIV);
             Console.WriteLine(encrypt);
             var decrypt = DESHelper.DecryptDES(encrypt, desKey, desIV);
             Console.WriteLine(decrypt);
             Console.ReadKey();
         }
     }
     public class DESHelper
     {
         static IBlockCipher engine = new DesEngine();
         /// <summary>
         /// 使用DES加密
         /// </summary>
         /// <param name="data">待加密的字符串</param>
         /// <param name="key">加密密钥,要求8位</param>
         /// <param name="iv">偏移向量</param>
         /// <returns></returns>
         public static string EncryptDES(string data, string key, string iv)
         {
             byte[] byKey = Encoding.UTF8.GetBytes(key);
             byte[] byIV = Encoding.UTF8.GetBytes(iv);
             byte[] byData = Encoding.UTF8.GetBytes(data);

             BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine), new Pkcs7Padding());
             cipher.Init(true, new ParametersWithIV(new DesParameters(byKey), byIV));
             byte[] rv = new byte[cipher.GetOutputSize(byData.Length)];
             int tam = cipher.ProcessBytes(byData, , byData.Length, rv, );
             cipher.DoFinal(rv, tam);
             return Convert.ToBase64String(rv);
         }
         /// <summary>
         /// 使用DES解密
         /// </summary>
         /// <param name="data">待解密的字符串</param>
         /// <param name="key">解密密钥,要求8位</param>
         /// <param name="vi">偏移向量</param>
         /// <returns></returns>
         public static string DecryptDES(string data, string key, string vi)
         {
             StringBuilder ret = new StringBuilder();
             foreach (byte b in Convert.FromBase64String(data))
             {
                 ret.AppendFormat("{0:X2}", b);
             }
             byte[] byData = new byte[ret.ToString().Length / ];
             for (int x = ; x < ret.ToString().Length / ; x++)
             {
                 int i = (Convert.ToInt32(ret.ToString().Substring(x * , ), ));
                 byData[x] = (byte)i;
             }
             byte[] byKey = Encoding.UTF8.GetBytes(key);
             byte[] byVI = Encoding.UTF8.GetBytes(vi);
             BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine));
             cipher.Init(false, new ParametersWithIV(new DesParameters(byKey), byVI));
             byte[] rv = new byte[cipher.GetOutputSize(byData.Length)];
             int tam = cipher.ProcessBytes(byData, , byData.Length, rv, );
             cipher.DoFinal(rv, tam);
             var rvl = new List<byte>();
             rvl.AddRange(rv);
             rvl.RemoveAll(b => b == );
             rv = rvl.ToArray();
             return Encoding.UTF8.GetString(rv);
         }
     }
 }