using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Security.Cryptography;using System.IO;namespace _3DES{  public partial class Form1 : Form  {    public Form1()    {      InitializeComponent();    }    private void CrypeBtn_Click(object sender, EventArgs e)    {      //實(shí)例化三倍DES服務(wù)提供者類(lèi)      TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();      //隨機(jī)生成密鑰和IV向量      TDES.GenerateIV();      TDES.GenerateKey();      //執(zhí)行加密      byte[] EncrypeByte = EncrypText(StrBox.Text, TDES.Key, TDES.IV);      //顯示密文和密鑰      KeyBox.Text = Encoding.ASCII.GetString(TDES.Key);      IVBox.Text = Encoding.ASCII.GetString(TDES.IV);      CrypeBox.Text = Encoding.UTF8.GetString(EncrypeByte);      //執(zhí)行解密      Str2Box.Text = DecrypText(EncrypeByte, TDES.Key, TDES.IV);    }    #region 加密    /// <summary>    /// 執(zhí)行三倍DES加密的方法    /// </summary>    /// <param name="Str">明文字符串</param>    /// <param name="Key">密鑰</param>    /// <param name="IV">IV向量</param>    /// <returns>密文的字節(jié)序列</returns>    private byte[] EncrypText(string Str, byte[] Key, byte[] IV)    {      //創(chuàng)建一個(gè)內(nèi)存流，用于存放密文      MemoryStream MS = new MemoryStream();      //創(chuàng)建一個(gè)三倍DES服務(wù)提供者對(duì)象      TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();      //創(chuàng)建一個(gè)加密流，用于加密操作      CryptoStream CS = new CryptoStream(MS,        TDES.CreateEncryptor(Key, IV),        CryptoStreamMode.Write);      //定義輸入，執(zhí)行加密操作      CS.Write(Encoding.UTF8.GetBytes(Str), 0, Str.Length);      CS.FlushFinalBlock();      //返回將密文的內(nèi)存流轉(zhuǎn)換為字節(jié)序列并返回      return MS.ToArray();    }    #endregion    #region 解密    /// <summary>    /// 執(zhí)行三倍DES解密的方法    /// </summary>    /// <param name="CrypeText">密文的字節(jié)序列</param>    /// <param name="Key">密鑰</param>    /// <param name="IV">IV向量</param>    /// <returns>明文的字符串</returns>    private string DecrypText(byte[] CrypeText, byte[] Key, byte[] IV)    {      //創(chuàng)建一個(gè)內(nèi)存流，用于存放密文      MemoryStream MS = new MemoryStream(CrypeText);      //創(chuàng)建一個(gè)三倍DES服務(wù)提供者對(duì)象      TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();      //創(chuàng)建解密流      CryptoStream CS = new CryptoStream(MS,        TDES.CreateDecryptor(Key, IV),        CryptoStreamMode.Read);      //創(chuàng)建一個(gè)用于存放明文的容器（字節(jié)序列）      byte[] DecrypeBytes = new byte[CrypeText.Length];      //執(zhí)行解密      CS.Read(DecrypeBytes, 0, CrypeText.Length);      //返回解密后的明文字符串      return Encoding.UTF8.GetString(DecrypeBytes);    }    #endregion  }}