package {
    import com.hurlant.crypto.*;
    import com.hurlant.util.*;
    import com.hurlant.crypto.symmetric.*;
    import flash.events.*;
    import flash.display.*;
    import flash.net.*;
    import flash.utils.ByteArray;
    
    public class Main extends MovieClip{
        private var loader:Loader;
        private var keyword:String = "test"//パスフレーズ
        
        public function Main(){
        var req:URLRequest = new URLRequest("読み込む画像URI");
            
            var byteLoader:URLLoader = new URLLoader();
            byteLoader.dataFormat = URLLoaderDataFormat.BINARY;
            byteLoader.addEventListener(Event.COMPLETE,compFunction);
            byteLoader.load(req);
        }
        
        private function compFunction(e:Event):void{
            var decryptData:ByteArray = decrypt(URLLoader(e.target).data);
            loader = new Loader();
            loader.loadBytes(decryptData);
            
            addChild(loader);
        }
        
        private function decrypt(data:ByteArray):ByteArray{
            
            var pad:IPad = new NullPad();
            var cipher:ICipher = Crypto.getCipher("des-ecb",Hex.toArray(Hex.fromString(keyword)),pad);
            pad.setBlockSize(cipher.getBlockSize());
            if (cipher is IVMode) {
                    var ivmode:IVMode = cipher as IVMode;
                    ivmode.IV = Hex.toArray("");
            }
            cipher.decrypt(data)
            return data;
        }
    }
}