<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/halo" width="300" height="150" backgroundColor="#E4E4E4"
			   creationComplete="init()">

	<fx:Script>
		<![CDATA[
			private var file:FileReference = new FileReference();		//加密文件
			private var file2:FileReference = new FileReference();		//解密文件
			private var fileByteArray:ByteArray ; 
			private var saveSwf:String;							//保存文件名称
			
			//初始化
			private function init():void{
				file.addEventListener(Event.SELECT , function (e:Event):void{
					file.load();
				});
				file.addEventListener(Event.COMPLETE , fileComplete);
				file2.addEventListener(Event.SELECT , function (e:Event):void{
					file2.load();
				});
				file2.addEventListener(Event.COMPLETE , file2Complete);
			}
			//点击加密
			protected function button1_clickHandler(event:MouseEvent):void
			{
				// TODO Auto-generated method stub
				if(password.text.length <= 0){
					error.text = "请输入密文";
					return;
				}else{
					error.text = "";
				}
				var filter:FileFilter = new FileFilter("*.swf","*.swf");
				file.browse([filter]);
			}
			//点击解密
			protected function button2_clickHandler(event:MouseEvent):void
			{
				// TODO Auto-generated method stub
				if(password.text.length <= 0){
					error.text = "请输入密文";
					return;
				}else{
					error.text = "";
				}
				var filter:FileFilter = new FileFilter("*.swf","*.swf");
				file2.browse([filter]);
			}
			//加密加载完成
			protected function fileComplete(e:Event):void{
				saveSwf = file.name;
				compress(file.data);				
			}
			//解密加载完成
			protected function file2Complete(e:Event):void{
				//trace(file2.name , file2.data.length);
				saveSwf = file2.name;
				uncompress(file2.data);				
			}
			
			//加密函数
			private function compress(byte:ByteArray):ByteArray{
				var key:String = password.text;		//得到密文
				var flag:int = 0;
				
				var newByte:ByteArray = new ByteArray();
				/* */
				for(var i:int = 0; i<byte.length ; i++ ,flag++){	
					if(flag >= key.length){
						flag = 0;
					}
					newByte.writeByte(byte[i] + key.charCodeAt(flag));
					//newByte.writeByte(byte[i] + 256);
				} 
				//输出
				fileByteArray = newByte;
				saveBtn.visible = true;
				return newByte;
			}
			
			//解密函数
			private function uncompress(byte:ByteArray):ByteArray{
				var key:String = password.text;		//得到密文
				var flag:int = 0;
				
				var newByte:ByteArray = new ByteArray();
				/* */
				for(var i:int = 0; i<byte.length ; i++ ,flag++){	
					if(flag >= key.length){
						flag = 0;
					}
					newByte.writeByte(byte[i] - key.charCodeAt(flag));
					//newByte.writeByte(byte[i] + 256);
				} 				
				//trace(newByte);
				fileByteArray = newByte;
				saveBtn.visible = true;
				return newByte;
			}

			protected function saveBtn_clickHandler(event:MouseEvent):void
			{
				// TODO Auto-generated method stub
				var saveFile:FileReference = new FileReference();
				saveFile.save(fileByteArray , saveSwf);			
			}

		]]>
	</fx:Script>

	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<s:Button x="10" y="10" label="加密swf" click="button1_clickHandler(event)"/>
	<s:Button x="88" y="10" label="解密swf" click="button2_clickHandler(event)"/>
	<s:Label x="10" y="50" text="密文："/>
	<s:TextInput id="password" x="54" y="45"/>
	<s:Button id="saveBtn" x="10" y="90" label="保存swf" visible="false" click="saveBtn_clickHandler(event)"/>
	<s:Label id="error" x="10" y="70" width="250" color="#FF0000"/>
</s:Application>