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| [MenuItem("AssetBundle/AssetBundle_Window")]
public static void BuildAssetToWindow()
{
string outPath = Application.dataPath + "/../BuildAssetBundle/Window/";
CreateDir(outPath);
BuildPipeline.BuildAssetBundles(outPath,BuildAssetBundleOptions.ForceRebuildAssetBundle, BuildTarget.StandaloneWindows);
AssetDatabase.Refresh();
}
public static void CreateDir(string path)
{
DirectoryInfo info = new DirectoryInfo(path);
if (!info.Exists)
{
info.Create();
}
}
private IEnumerator EncryptionAB()
{
WWW www = new WWW("file:///D:\\fcj\\unity209\\VuforiaStudy\\BuildAssetBundle\\Window\\testab");
yield return www;
if (www.isDone)
{
if (www.error == null)
{
byte[] bytes = www.bytes;
for (int i = 0; i < bytes.Length; i++)//恺撒加密
{
bytes[i] += 1;
}
File.WriteAllBytes("D:\\fcj\\unity2018\\VuforiaStudy\\BuildAssetBundle\\Window\\myab_Encryption.assetbundle", bytes);
}
}
}
private IEnumerator DecryptAB()
{
WWW www = new WWW("file:///D:\\fcj\\unity2018\\VuforiaStudy\\BuildAssetBundle\\Window\\myab_Encryption.assetbundle");
yield return www;
if (www.isDone)
{
if (www.error == null)
{
byte[] bytes = www.bytes;
for (int i = 0; i < bytes.Length; i++)//恺撒解密
{
bytes[i] -= 1;
}
AssetBundle ab = AssetBundle.LoadFromMemory(bytes);
GameObject go = ab.LoadAsset("Sphere") as GameObject;//注意这里是预制体名字
Instantiate(go, Vector3.zero, Quaternion.identity);
ab.Unload(false);
}
}
}
```
3.3 自定义加密
比如他自己随机改数据里面的值 或者加上数据标头等等
```c#
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
/// <summary>
/// ab资源字节加密
/// </summary>
public class AssetBundleEncrypt {
private readonly static byte[] AssetHead = new byte[]
{
0x55, 0x6E, 0x69, 0x74,
0x78, 0x00, 0x32, 0x30,
};
private readonly static byte[] RiverHead = new byte[]
{
0x74, 0x69, 0x61,
};
private static Dictionary<byte, bool> helpDic = new Dictionary<byte, bool>();
// 加密
public static byte[] EncryptAsset(byte[] bytes, bool needNewByts = false)
{
var result = bytes;
if (needNewByts)
{
result = new MemoryStream(bytes).ToArray();
}
if (result.Length < 2048)
{ // 小于2048直接不加密
return result;
}
helpDic.Clear();
int mid = (AssetHead.Length - RiverHead.Length) / 2;
byte[] encryptBytes = new byte[mid * 2];
for (int i = 0, length = AssetHead.Length - RiverHead.Length; i < length; i+=2)
{
byte pos = 0;
byte value = 0;
pos = (byte)(Random.value * 255);
while (helpDic.ContainsKey(pos))
{
pos = (byte)(Random.value * 255);
}
helpDic.Add(pos, true);
if (i < mid)
{
value = result[pos + AssetHead.Length];
result[pos + AssetHead.Length] = (byte)(Random.value * 255);
}
else
{
value = result[result.Length - pos - 1];
result[result.Length - pos - 1] = (byte)(Random.value * 255);
}
encryptBytes[i] = pos;
encryptBytes[i + 1] = value;
}
for (int i = 0, length = RiverHead.Length; i < length; i++)
{
result[i] = RiverHead[i];
}
for (int i = RiverHead.Length, length = RiverHead.Length + encryptBytes.Length; i < length; i++)
{
result[i] = encryptBytes[i - RiverHead.Length];
}
return result;
}
// 解密
public static byte[] UnEncryptAsset(byte[] bytes, bool needNewByts = false)
{
var result = bytes;
if (needNewByts)
{
result = new MemoryStream(bytes).ToArray();
}
if(result.Length < 2048)
{ // 小于2048直接不加密
return result;
}
int mid = (AssetHead.Length - RiverHead.Length) / 2;
for (int i = 0, length = AssetHead.Length - RiverHead.Length; i < length; i+= 2)
{
byte pos = result[RiverHead.Length + i];
byte value = result[RiverHead.Length + i + 1];
if (i < mid)
{
result[pos + AssetHead.Length] = value;
}
else
{
result[result.Length - pos - 1] = value;
}
}
for (int i = 0, length = AssetHead.Length; i < length; i++)
{
result[i] = AssetHead[i];
}
return result;
}
}
//加密调用
string publishTempPath = GetFullUrlPublish(Path.GetFileName(resPath));
var bytes = File.ReadAllBytes(resPath);
if (type.ToLower() == ".unity3d")
bytes = AssetBundleEncrypt.EncryptAsset(bytes);
File.WriteAllBytes(publishTempPath, bytes);
//解密调用
var bytes = www.downloadHandler.data;
if (GameVersion.isHotUpdate || GameVersion.isSplitAsset)
bytes = AssetBundleEncrypt.UnEncryptAsset(bytes);
AssetBundle bundle = AssetBundle.LoadFromMemory(bytes);
|
