3DES解密时---指定键的大小对于此算法无效
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Security.Cryptography;using System.IO;namespace DataEncrypt{ public partial class FormMain : Form { public FormMain() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string str = textBoxInput.Text; if (str.Length == 0) { MessageBox.Show("请输入被加密的字符串"); return; } //加密 try { TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); //随机生成密钥Key和初始化向量IV tdes.GenerateKey(); tdes.GenerateIV(); byte[] encryptedBytes = EncryptText(str, tdes.Key, tdes.IV); File.AppendAllText("C:\\MyData.txt", Encoding.UTF8.GetString(tdes.Key)); File.AppendAllText("C:\\MyData.txt", "\r\n"); File.AppendAllText("C:\\MyData.txt", Encoding.UTF8.GetString(tdes.IV)); File.AppendAllText("C:\\MyData.txt", "\r\n"); File.AppendAllText("C:\\MyData.txt", Encoding.UTF8.GetString(encryptedBytes)); // textBoxKey.Text = Encoding.UTF8.GetString(tdes.Key); //得到加密后的字节流 //显示加密后的字符串 // textBoxInput.Text = Encoding.UTF8.GetString(encryptedBytes); //解密 // string decryptString = DecryptText(encryptedBytes, tdes.Key, tdes.IV); //显示解密后的字符串 // textBoxInput.Text = decryptString; } catch (Exception err) { MessageBox.Show(err.Message, "出错"); } } private byte[] EncryptText(string str, byte[] Key, byte[] IV) { //创建一个内存流 MemoryStream memoryStream = new MemoryStream(); //使用传递的私钥和IV创建加密流 CryptoStream cryptoStream = new CryptoStream(memoryStream, new TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), CryptoStreamMode.Write); //将传递的字符串转换为字节数组 byte[] toEncrypt = Encoding.UTF8.GetBytes(str); try { //将字节数组写入加密流,并清除缓冲区 cryptoStream.Write(toEncrypt, 0, toEncrypt.Length); cryptoStream.FlushFinalBlock(); //得到加密后的字节数组 byte[] encryptedBytes = memoryStream.ToArray(); return encryptedBytes; } catch (CryptographicException err) { throw new Exception("加密出错：" + err.Message); } finally { cryptoStream.Close(); memoryStream.Close(); } } private string DecryptText(byte[] dataBytes, byte[] Key, byte[] IV) { //根据加密后的字节数组创建一个内存流 MemoryStream memoryStream = new MemoryStream(dataBytes); //使用传递的私钥、IV和内存流创建解密流 CryptoStream cryptoStream = new CryptoStream(memoryStream, new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), CryptoStreamMode.Read); //创建一个字节数组保存解密后的数据 byte[] decryptBytes = new byte[dataBytes.Length]; try { //从解密流中将解密后的数据读到字节数组中 cryptoStream.Read(decryptBytes, 0, decryptBytes.Length); //得到解密后的字符串 string decryptedString = Encoding.UTF8.GetString(decryptBytes); return decryptedString; } catch (CryptographicException err) { throw new Exception("解密出错：" + err.Message); } finally { cryptoStream.Close(); memoryStream.Close(); } } private void DecryptFromFile() { if (File.Exists("C:\\MyData.txt")) { // TripleDESCryptoServiceProvider tdes2 = new TripleDESCryptoServiceProvider(); StreamReader sr = new StreamReader("C:\\MyData.txt",Encoding.Default); byte[] Key = System.Text.Encoding.Default.GetBytes(sr.ReadLine()); byte[] IV = System.Text.Encoding.Default.GetBytes(sr.ReadLine()); byte[] encryptedBytes = System.Text.Encoding.Default.GetBytes(sr.ReadLine()); sr.Close(); string decryptString = DecryptText(encryptedBytes, Key, IV); textBoxInput.Text = decryptString; } } private void button2_Click(object sender, EventArgs e) { DecryptFromFile(); } private void FormMain_Load(object sender, EventArgs e) { DecryptFromFile(); } }}