C# 文件夹加密

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我是靠谱客的博主兴奋仙人掌，最近开发中收集的这篇文章主要介绍C# 文件夹加密，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

可以加密文件内容，也可以对文件夹本身进行加密，本文对文件夹加密。

一、指定或生成一个密钥

1）指定的密钥

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/// <summary>
2
/// 密钥，这个密码可以随便指定
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/// </summary>
4
public static string sSecretKey = "?a??64(?";

View Code

2）也可以生成密钥

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/// <summary>
 2
/// 生成一个64位的密钥
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/// </summary>
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/// <returns>string</returns>
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public static string GenerateKey()
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{
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//创建对称算法的一个实例。自动生成的密钥和IV。
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DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
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// 使用自动生成的密钥进行加密。
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return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
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}

View Code

二、调用ZeroMemory 函数从内存中删除Key

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/// <summary>
2
/// 调用该函数从内存中删除的Key后使用
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/// </summary>
4
[DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
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public static extern bool ZeroMemory(IntPtr Destination, int Length);

View Code

三、加密文件

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/// <summary>
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/// 加密文件
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/// </summary>
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/// <param name="sInputFilename">待加密的文件的完整路径</param>
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/// <param name="sOutputFilename">加密后的文件的完整路径</param>
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public static void EncryptFile(string sInputFilename, string sOutputFilename)
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{
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FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
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FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);
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DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
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DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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ICryptoTransform desencrypt = DES.CreateEncryptor();
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CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);
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byte[] bytearrayinput = new byte[fsInput.Length];
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fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
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cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
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cryptostream.Flush();
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fsInput.Flush();
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fsEncrypted.Flush();
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cryptostream.Close();
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fsInput.Close();
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fsEncrypted.Close();
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}

View Code

四、解密文件

 1 /// <summary>
 2
/// 解密文件
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/// </summary>
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/// <param name="sInputFilename">待解密的文件的完整路径</param>
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/// <param name="sOutputFilename">解密后的文件的完整路径</param>
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public static void DecryptFile(string sInputFilename, string sOutputFilename)
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{
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DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
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DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
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ICryptoTransform desdecrypt = DES.CreateDecryptor();
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CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);
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StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
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fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
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fsDecrypted.Flush();
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fsDecrypted.Close();
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}

View Code

五、完整代码

 1 /// <summary>
 2
/// 文件加密
 3
/// </summary>
 4
public class FileSecretHelper
 5 
{
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/// <summary>
 7
/// 密钥，这个密码可以随便指定
 8
/// </summary>
 9
public static string sSecretKey = "?a??64(?";
10
11
/// <summary>
12
/// 调用该函数从内存中删除的Key后使用
13
/// </summary>
14
[DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
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public static extern bool ZeroMemory(IntPtr Destination, int Length);
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/// <summary>
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/// 生成一个64位的密钥
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/// </summary>
21
/// <returns>string</returns>
22
public static string GenerateKey()
23 
{
24
//创建对称算法的一个实例。自动生成的密钥和IV。
25
DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
26
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// 使用自动生成的密钥进行加密。
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return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
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}
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/// <summary>
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/// 加密文件
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/// </summary>
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/// <param name="sInputFilename">待加密的文件的完整路径</param>
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/// <param name="sOutputFilename">加密后的文件的完整路径</param>
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public static void EncryptFile(string sInputFilename, string sOutputFilename)
37 
{
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FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
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FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);
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DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
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DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
44
ICryptoTransform desencrypt = DES.CreateEncryptor();
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CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);
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byte[] bytearrayinput = new byte[fsInput.Length];
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fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
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cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
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cryptostream.Flush();
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fsInput.Flush();
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fsEncrypted.Flush();
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cryptostream.Close();
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fsInput.Close();
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fsEncrypted.Close();
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}
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/// <summary>
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/// 解密文件
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/// </summary>
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/// <param name="sInputFilename">待解密的文件的完整路径</param>
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/// <param name="sOutputFilename">解密后的文件的完整路径</param>
64
public static void DecryptFile(string sInputFilename, string sOutputFilename)
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{
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DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
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DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
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FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
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ICryptoTransform desdecrypt = DES.CreateDecryptor();
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CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);
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StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
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fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
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fsDecrypted.Flush();
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fsDecrypted.Close();
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}
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}