AssetBuntle加密解密

最新推荐文章于 2025-05-26 09:45:26 发布

原创最新推荐文章于 2025-05-26 09:45:26 发布 · 442 阅读

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本文介绍了一个Unity项目的加密流程，包括使用特定的异或因子对文件进行解密和加密的方法，以及如何通过读取本地文件并应用这些加密技术来保护资源。

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参照悠游课堂边涯

1、解密

using UnityEngine;
using System.Collections;

public sealed class SecurityUtil
{
#region xorScale 异或因子
/// <summary>
/// 异或因子
/// </summary>
private static readonly byte[] xorScale = new byte[] { 45, 66, 38, 55, 23, 254, 9, 165, 90, 19, 41, 45, 201, 58, 55, 37, 254, 185, 165, 169, 19, 171 };//.data文件的xor加解密因子
#endregion

private SecurityUtil()
{

}

/// <summary>
/// 对数组进行异或
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static byte[] Xor(byte[] buffer)
{
//------------------
//第3步：xor解密
//------------------
int iScaleLen = xorScale.Length;
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = (byte)(buffer[i] ^ xorScale[i % iScaleLen]);
}
return buffer;
}
}

2、文件加载

using UnityEngine;
using System.Collections;
using System.IO;

/// <summary>
/// 本地文件管理
/// </summary>
public class LocalFileMgr : Singleton<LocalFileMgr>
{
public readonly string LocalFilePath = Application.persistentDataPath + "/";

/// <summary>
/// 读取本地文件到byte数组
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public byte[] GetBuffer(string path)
{
byte[] buffer = null;

using (FileStream fs = new FileStream(path, FileMode.Open))
{
buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
}
return buffer;
}
}

3、加密

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using System;

namespace ABFW
{
   public class AssetBundleWindow
   {
private void AssetBundleEncrypt(string path)
{
string[] files = Directory.GetFiles(path);

foreach (string file in files)
{
FileInfo fileInfo = new FileInfo(file);
if(!fileInfo.Extension.Equals(".ab",System.StringComparison.CurrentCultureIgnoreCase)&&
!fileInfo.Extension.Equals(".unity3d",StringComparison.CurrentCultureIgnoreCase)
)
{
continue;
}
byte[] buffer = null;
using (FileStream fs = new FileStream(file, FileMode.Open))
{
buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
}
buffer = SecurityUtil.Xor(buffer);
using (FileStream fs = new FileStream(file, FileMode.Create))
{
fs.Write(buffer, 0, buffer.Length);
fs.Flush();
}
}
string[] dirs = Directory.GetDirectories(path);
foreach (string dir in dirs)
{
AssetBundleEncrypt(dir);
}

}

}//class end
}