如何在C＃中使用AES算法加密包含大文件的文件夹 [英] How to encrypt a folder with large files using AES algorithm in C#
问题描述
嗨代码项目伙伴，
加密和解密问题严重。我有一个文件夹，可以有不同的大小，但可以有100 GB左右。
我的项目需要：
需要的是当我注销系统时，我创建的Windows服务应该加密文件夹（这是100 GB数据的文件夹）。当我再次登录时，它应解密它并使文件夹可用。
所以这就是我的问题：
我现在有一种方法可以循环格式加密和解密文件夹中的文件。因此，想象一下，当我们注销或登录时，文件夹中是否有100 GB或更高版本。系统可能会挂起如此大量的数据。
< b>我想要你们这些人：
我不是要求你们提供完整的代码。我只需要一个帮助。
实际上我想要一些代码示例或者某些东西可以帮助我摆脱这个问题。此外，我正在搜索整个文件夹加密而不是内部的单个文件。
我正在寻找使这个软件类似于BITLOCKER。我的服务应该轻松处理大文件。
我尝试过：
我试过以下代码：
Hi Code project mates,
I have a serious problem with encryption and decryption. What I have is a folder which can be in varied sizes but can have an amount 100 GB or so.
My project need:
The need is when I log off the system the windows service I have created should encrypt the folder(which is the folder with 100 GB data). And when I log in again it should decrypt it and make the folder usable.
So here comes my problem:
I am right now have a method which encrypts and decrypts files inside a folder in a loop format. So just imagine if I have a 100 GB or above in a folder while we log off or log in. The system may hang with such large amount of data.
What I want from you guys:
I am not asking for complete code from you guys. I need just an help.
Actually I want some code samples or something which helps me get rid of the problem. Also I am searching for the encrypting the folder on the whole instead of individual files inside.
I am looking for making this software similar to BITLOCKER. My service should handle the large files with ease.
What I have tried:
I have tried the below code:
protected void enCrypt(string filePath, string passWord)
{
//File.SetAttributes(filePath, FileAttributes.Normal);
byte[] filestobeEncrypted = File.ReadAllBytes(filePath);
byte[] passwordBytes = Encoding.UTF8.GetBytes(passWord);
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
byte[] bytesEncrypted = AES_Encrypt(filestobeEncrypted, passwordBytes);
File.WriteAllBytes(filePath, bytesEncrypted);
}
protected void deCrypt(string filePath, string passWord)
{
//File.SetAttributes(filePath, FileAttributes.Normal);
byte[] filestobeDecrypted = File.ReadAllBytes(filePath);
byte[] passwordBytes = Encoding.UTF8.GetBytes(passWord);
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
byte[] bytesDecrypted = AES_Decrypt(filestobeDecrypted, passwordBytes);
File.WriteAllBytes(filePath, bytesDecrypted);
}
public static byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
{
byte[] encryptedBytes = null;
// Set your salt here, change it to meet your flavor:
// The salt bytes must be at least 8 bytes.
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CBC;
using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
cs.Close();
}
encryptedBytes = ms.ToArray();
}
}
return encryptedBytes;
}
public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
{
byte[] decryptedBytes = null;
// Set your salt here, change it to meet your flavor:
// The salt bytes must be at least 8 bytes.
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CBC;
using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
cs.Close();
}
decryptedBytes = ms.ToArray();
}
}
return decryptedBytes;
}
推荐答案
您可以使用多线程来处理加密（一次启动几个线程，以便不要绑定CPU）。
你不能加密文件夹。您必须加密文件夹中的文件。这是一篇关于AES加密的CP文章：
[ ^ ]
您可以创建加密包含所有文件的ZIP文件，但这需要很长时间。
我认为更好的解决方案是将服务器添加到具有bitlocker的网络上它，将文件夹复制到该服务器，然后添加适当的用户访问权限。不要问我细节 - 我只是在墙上扔东西看看有什么东西。
You can use multi-threading to handle the encryption (fire off a few threads at a time so as not to bind the CPU up).
You cannot encrypt a folder. You have to encrypt the files inside the folder. Here's a CP article that talks about AES encryption:
FIPS Encryption Algorithms and Implementation of AES in C# and SQL Server 2008[^]
You could create an encrypted ZIP file containing all of the files, but that would take a LONG time.
I think a better solution would be to add a server to the network that has bitlocker on it, copy the folder to that server, and then add appropriate user permissions for access. Don't ask me for details - I'm just throwin' stuff at the wall to see what sticks.
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