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) {
//实例化三倍DES服务提供者类 TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();
//随机生成密钥和IV向量 TDES.GenerateIV();
TDES.GenerateKey();
//执行加密 byte[] EncrypeByte = EncrypText(StrBox.Text, TDES.Key, TDES.IV);
//显示密文和密钥 KeyBox.Text = Encoding.ASCII.GetString(TDES.Key);
IVBox.Text = Encoding.ASCII.GetString(TDES.IV);
CrypeBox.Text = Encoding.UTF8.GetString(EncrypeByte);
//执行解密 Str2Box.Text = DecrypText(EncrypeByte, TDES.Key, TDES.IV);
}
#region 加密 /// <summary> /// 执行三倍DES加密的方法 /// </summary> /// <param name="Str">明文字符串</param> /// <param name="Key">密钥</param> /// <param name="IV">IV向量</param> /// <returns>密文的字节序列</returns> private byte[] EncrypText(string Str, byte[] Key, byte[] IV) {
//创建一个内存流，用于存放密文 MemoryStream MS = new MemoryStream();
//创建一个三倍DES服务提供者对象 TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();
//创建一个加密流，用于加密操作 CryptoStream CS = new CryptoStream(MS, TDES.CreateEncryptor(Key, IV), CryptoStreamMode.Write);
//定义输入，执行加密操作 CS.Write(Encoding.UTF8.GetBytes(Str), 0, Str.Length);
CS.FlushFinalBlock();
//返回将密文的内存流转换为字节序列并返回 return MS.ToArray();
}
#endregion #region 解密 /// <summary> /// 执行三倍DES解密的方法 /// </summary> /// <param name="CrypeText">密文的字节序列</param> /// <param name="Key">密钥</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) {
//创建一个内存流，用于存放密文 MemoryStream MS = new MemoryStream(CrypeText);
//创建一个三倍DES服务提供者对象 TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();
//创建解密流 CryptoStream CS = new CryptoStream(MS, TDES.CreateDecryptor(Key, IV), CryptoStreamMode.Read);
//创建一个用于存放明文的容器（字节序列） byte[] DecrypeBytes = new byte[CrypeText.Length];
//执行解密 CS.Read(DecrypeBytes, 0, CrypeText.Length);
//返回解密后的明文字符串 return Encoding.UTF8.GetString(DecrypeBytes);
}
#endregion }
}