unity3d 加密/解密 并且可以支持自动cache

string url = "http://www.mywebsite.com/mygame/assetbundles/assetbundle1.unity3d";

IEnumerator Start () {

    // Start a download of the encrypted assetbundle

    WWW www = new WWW.LoadFromCacheOrDownload (url, 1);

    // Wait for download to complete

    yield return www;

    // Load the TextAsset from the AssetBundle

    TextAsset textAsset = www.assetBundle.Load("EncryptedData", typeof(TextAsset));

    // Get the byte data

    byte[] encryptedData = textAsset.bytes;

    // Decrypt the AssetBundle data

    byte[] decryptedData = YourDecryptionMethod(encryptedData);

    // Create an AssetBundle from the bytes array

    AssetBundle bundle = AssetBundle.CreateFromMemory(decryptedData);

    // You can now use your AssetBundle. The wrapper AssetBundle is cached

}