c#实现拖拽打开方法.doc

首先，这是个winform的程序，部署在市场部同事的笔记本上面，基于.Net 2.0做的，它的功能大致如下： 加密合同文档（*.doc） 在客户处解密此合同文档，进行编辑，再次加密 回到公司可以通过密码打开它由于时间关系，只是很粗略的做了个大概。打开vs2008，建立一个winform项目，设计程序界面如下：很简单的，待会儿在文章最后会有下载地址。我们可以把任意文件，拖入程序界面，即可进行加密，在此暂不作说明，大家可以待会儿下载回去试试，很简单的。下面分享一下加密代码吧：代码 using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace FileLock / / 异常处理类 / public class CryptoHelpException : ApplicationException public CryptoHelpException(string msg) : base(msg) public class CryptoHelp private const ulong FC_TAG = 0xFC010203040506CF; private const int BUFFER_SIZE = 128 * 1024; / / 检验两个Byte数组是否相同 / / Byte数组 / Byte数组 / true相等 private static bool CheckByteArrays(byte b1, byte b2) if (b1.Length = b2.Length) for (int i = 0; i b1.Length; +i) if (b1i != b2i) return false; return true; return false; / / 创建Rijndael SymmetricAlgorithm / / 密码 / / 加密对象 private static SymmetricAlgorithm CreateRijndael(string password, byte salt) PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, SHA256, 1000); SymmetricAlgorithm sma = Rijndael.Create(); sma.KeySize = 256; sma.Key = pdb.GetBytes(32); sma.Padding = PaddingMode.PKCS7; return sma; / / 加密文件随机数生成 / private static RandomNumberGenerator rand = new RNGCryptoServiceProvider(); / / 生成指定长度的随机Byte数组 / / Byte数组长度 / 随机Byte数组 private static byte GenerateRandomBytes(int count) byte bytes = new bytecount; rand.GetBytes(bytes); return bytes; / / 加密文件 / / 待加密文件 / 加密后输入文件 / 加密密码 public static void EncryptFile(string inFile, string outFile, string password) using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile) long lSize = fin.Length; / 输入文件长度 int size = (int)lSize; byte bytes = new byteBUFFER_SIZE; / 缓存 int read = -1; / 输入文件读取数量 int value = 0; / 获取IV和salt byte IV = GenerateRandomBytes(16); byte salt = GenerateRandomBytes(16); / 创建加密对象 SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt); sma.IV = IV; / 在输出文件开始部分写入IV和salt fout.Write(IV, 0, IV.Length); fout.Write(salt, 0, salt.Length); / 创建散列加密 HashAlgorithm hasher = SHA256.Create(); using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write) BinaryWriter bw = new BinaryWriter(cout); bw.Write(lSize); bw.Write(FC_TAG); / 读写字节块到加密流缓冲区 while (read = fin.Read(bytes, 0, bytes.Length) != 0) cout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; / 关闭加密流 chash.Flush(); chash.Close(); / 读取散列 byte hash = hasher.Hash; / 输入文件写入散列 cout.Write(hash, 0, hash.Length); / 关闭文件流 cout.Flush(); cout.Close(); / / 解密文件 / / 待解密文件 / 解密后输出文件 / 解密密码 public static void DecryptFile(string inFile, string outFile, string password) / 创建打开文件流 using (FileStream fin = File.OpenRead(inFile), fout = File.OpenWrite(outFile) int size = (int)fin.Length; byte bytes = new byteBUFFER_SIZE; int read = -1; int value = 0; int outValue = 0; byte IV = new byte16; fin.Read(IV, 0, 16); byte salt = new byte16; fin.Read(salt, 0, 16); SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt); sma.IV = IV; value = 32; long lSize = -1; / 创建散列对象, 校验文件 HashAlgorithm hasher = SHA256.Create(); /using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read), / chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write) / CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read), chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write); / 读取文件长度 BinaryReader br = new BinaryReader(cin); lSize = br.ReadInt64(); ulong tag = br.ReadUInt64(); if (FC_TAG != tag) throw new CryptoHelpException(文件被破坏或者密码不正确); long numReads = lSize / BUFFER_SIZE; long slack = (long)lSize % BUFFER_SIZE; for (int i = 0; i 0) read = cin.Read(bytes, 0, (int)slack); fout.Write(bytes, 0, read); chash.Write(bytes, 0, read); value += read; outValue += read; chash.Flush(); chash.Close(); fout.Flush(); fout.Close(); byte curHash = hasher.Hash; / 获取比较和旧的散列对象 byte oldHash = new bytehasher.HashSize / 8; read = cin.Read(oldHash, 0, oldHash.Length); if (oldHash.Length != read) | (!CheckByteArrays(oldHash, curHash) throw new CryptoHelpException(文件被破坏); cin.Flush(); cin.Close(); / if (outValue != lSize) throw new CryptoHelpException(文件大小不匹配); 是不是很明了呢？当然了，网上一搜一大把，我这个也是不小心搜到的，感觉比较不错的代码，后来经过我少许加工，即可使用了。当然，在这里，还要提一句，这个小程序，为了让它更方便，直接拖拽文件到其图标之上，就默认打开程序，加载该文件，并进行加密操作，听起来是不是很cool!?呵呵，下面再和大家分享一下如何实现吧：在窗体的DragDrop和DragEnter事件下，添加如下代码：代码 private void MainForm_DragEnter(object sender, DragEventArgs e) if (e.Data.GetDataPresent(DataFormats.FileDrop) e.Effect = DragDropEffects.Move; else e.Effect = DragDropEffects.None; private void MainForm_DragDrop(object sender, DragEventArgs e) string path = (System.Array)e.Data.GetData(DataFormats.FileDrop).GetValue(0).ToString(); extension = System.IO.Path.GetExtension(path);/扩展名 if (e