大家好，又见面了，我是你们的朋友全栈君。
一般的webgame中都会对资源、消息进行加密，这里只是简单记录一下对文件的加密过程。
上图为实际项目中所使用的加密工具(较为简单的一个air项目)
输入加密key + 需要加密的文件 –> 加密 –> 将加密后的文件保存至另一目录(后缀名视自己的项目的规则进行修改)
实现步骤：
1、读取文件(flash.filesystem.File)，获取文件流(flash.filesystem.FileStream)，获取文件的二进制流(flash.util.ByteArray)
2、对二进制数据进行加密（混淆一下）
3、保存加密后的二进制数据
1: var file:File = new File(path);
2: //file.isDirectory == false && file.exists
3: 4: var fs:FileStream = new FileStream();
5: var bytes:ByteArray = new ByteArray();
6: fs.open(file, FileMode.READ); //只读模式
7: fs.position = 0; 8: fs.readBytes(bytes, 0, fs.bytesAvailable); 9: fs.close(); 10: 11: 12: var tempFileName:String = "xxx"; //要保存的文件完整路径
13: var tempFile:File = new File(tempFileName);
14: if (tempFile.exists)
15: {
16: tempFile.deleteFile(); 17: 18: tempFile = new File(tempFileName);
19: } 20: 21: var tempFS:FileStream = new FileStream();
22: tempFS.open(tempFile, FileMode.WRITE); 23: tempFS.writeBytes(encrypt(bytes)); //加密数据
24: tempFS.close(); 25: 26: 27: //encrypt..
28: var pos:int = 0;
29: var outByteArray:ByteArray = new ByteArray();
30: var key:String = StringUtil.trim(keyTxt.text); 31: 32: for (var i:int = 0, len:int = byte.length; i < len; i++)
33: {
34: //todo...
35: 36: outByteArray.writeByte(byte[i] + //.....);
37: } 38: 39: return outByteArray;
主要的示例代码（加密方法已被隐去>_<）：
1: <?xml version="1.0" encoding="utf-8"?>
2: <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" height="100%"
3: horizontalScrollPolicy="off" verticalScrollPolicy="off">
4: 5: <mx:Script> 6: <![CDATA[ 7: import mx.controls.Alert;
8: import mx.utils.StringUtil;
9: 10: private var filePath:String;
11: private var directoryPath:String;
12: 13: private function encryptHandler():void
14: {
15: if (!filePath && !directoryPath)
16: {
17: Alert.show("请先选择要加密的文件或目录", "错误");
18: return ;
19: } 20: 21: var key:String = StringUtil.trim(keyTxt.text); 22: 23: if (key == "")
24: {
25: Alert.show("加密KEY不能为空", "错误");
26: return ;
27: } 28: 29: encryptBtn.enabled = false; 30: 31: if (!(!filePath))
32: {
33: encryptFileHandler(filePath); 34: 35: Alert.show("文件“"+filePath+"”加密完成", "温馨提示");
36: } 37: else if (!(!directoryPath))
38: {
39: encryptDirectoryHandler(directoryPath); 40: 41: Alert.show("目录“"+directoryPath+"”文件加密完成", "温馨提示");
42: } 43: 44: outputTxt.validateNow(); 45: 46: encryptBtn.enabled = true; 47: } 48: 49: private function getTypeFilter():FileFilter
50: {
51: var str:String = "*.swf;*.jpg;*.png;*.xml;*.zip";
52: 53: var filter:FileFilter = new FileFilter("资源("+str+")", str);
54: 55: return filter;
56: } 57: 58: private function selectFileHandler():void
59: {
60: var file:File = new File();
61: file.addEventListener(Event.SELECT, selectFileCallback); 62: file.browseForOpen("请选择一个文件", [getTypeFilter()]);
63: } 64: 65: private function selectFileCallback(evt:Event):void
66: {
67: clear(); 68: 69: var file:File = File(evt.target); 70: file.removeEventListener(Event.SELECT, selectFileCallback); 71: 72: filePath = file.nativePath; 73: 74: inputTxt.htmlText = "选择的文件路径：" + filePath;
75: } 76: 77: private function selectDirectoryHandler():void
78: {
79: var file:File = new File();
80: file.addEventListener(Event.SELECT, selectDirectoryCallback); 81: file.browseForDirectory("请选择一个目录");
82: } 83: 84: private function selectDirectoryCallback(evt:Event):void
85: {
86: clear(); 87: 88: directoryPath = File(evt.target).nativePath; 89: 90: inputTxt.htmlText = "选择的目录路径：" + directoryPath;
91: 92: File(evt.target).removeEventListener(Event.SELECT, selectDirectoryCallback); 93: } 94: 95: private function getEncryptSuffix(fileType:String):String
96: {
97: var typeConfig:Object = {
98: 'swf' : 's',
99: 'jpg' : 'j',
100: 'png' : 'p',
101: 'xml' : 'x',
102: 'zip' : 'z'
103: }; 104: 105: if (!typeConfig[fileType])
106: {
107: return fileType;
108: } 109: 110: return typeConfig[fileType];
111: } 112: 113: private function clear():void
114: {
115: inputTxt.htmlText = "";
116: outputTxt.htmlText = "";
117: 118: filePath = null; 119: directoryPath = null; 120: } 121: 122: private function encryptFileHandler(path:String):void
123: {
124: var file:File = new File(path);
125: 126: if (file.isDirectory == false && file.exists)
127: {
128: maskPanel.visible = true; 129: 130: var fs:FileStream = new FileStream();
131: var bytes:ByteArray = new ByteArray();
132: 133: fs.open(file, FileMode.READ); 134: fs.position = 0; 135: fs.readBytes(bytes, 0, fs.bytesAvailable); 136: fs.close(); 137: 138: loadFileCompleteHandler(file, bytes); 139: 140: maskPanel.visible = false; 141: } 142: else
143: {
144: outputTxt.htmlText += "<br>【error】" + path + "不是一个正确的文件路径！";
145: } 146: } 147: 148: private function encryptDirectoryHandler(path:String):void
149: {
150: var file:File = new File(path);
151: 152: if (file.exists && file.isDirectory)
153: {
154: var fileList:Array = file.getDirectoryListing(); 155: var typeArr:Array = ["swf", "zip", "xml", "jpg", "png"];
156: 157: for (var i:int = 0, len:int = fileList.length; i < len; i++)
158: {
159: var tempFile:File = File(fileList[i]); 160: var tempFilePath:String = tempFile.nativePath; 161: 162: if (tempFile.isDirectory == false)
163: {
164: if (typeArr.indexOf(tempFile.extension) > -1)
165: {
166: encryptFileHandler(tempFilePath); 167: } 168: else
169: {
170: outputTxt.htmlText += "<br><font color='#ff0000'>【skip】跳过文件："+tempFilePath+"</font>";
171: } 172: } 173: else if (tempFile.name != ".svn")
174: {
175: encryptDirectoryHandler(tempFilePath); 176: } 177: } 178: } 179: else
180: {
181: outputTxt.htmlText += "<br>【error】" + path + "不是一个正确的目录路径！";
182: } 183: } 184: 185: private function loadFileCompleteHandler(file:File, bytes:ByteArray):void
186: {
187: outputTxt.htmlText += "<br>开始加密文件" + file.nativePath;
188: 189: var tempFileName:String = file.parent.nativePath + "\\" + file.name.replace(new RegExp(file.extension + "$"), "") + getEncryptSuffix(file.extension);
190: 191: tempFileName = tempFileName.replace(/\\abc\\/, '\\encrypt_abc\\abc\\'); 192: 193: var tempFile:File = new File(tempFileName); 194: 195: if (tempFile.exists) 196: {
197: tempFile.deleteFile(); 198: 199: tempFile = new File(tempFileName); 200: } 201: 202: var tempFS:FileStream = new FileStream(); 203: tempFS.open(tempFile, FileMode.WRITE); 204: tempFS.writeBytes(encrypt(bytes)); 205: tempFS.close(); 206: } 207: 208: private function encrypt(byte:ByteArray):ByteArray 209: {
210: var pos:int = 0; 211: var outByteArray:ByteArray = new ByteArray(); 212: var key:String = StringUtil.trim(keyTxt.text); 213: //todo... 214: 215: return outByteArray; 216: } 217: 218: ]]> 219: </mx:Script> 220: 221: <mx:VBox width="100%" height="100%"
222: horizontalScrollPolicy="off" verticalScrollPolicy="off"
223: paddingLeft="10" paddingRight="10" paddingTop="10" paddingBottom="10">
224: 225: <mx:HBox width="100%" height="50" horizontalScrollPolicy="off" verticalScrollPolicy="off"
226: verticalAlign="middle">
227: 228: <mx:Label text="加密KEY" />
229: <mx:TextInput id="keyTxt" width="300" text="abc123" />
230: <mx:Button label="加密" id="encryptBtn" click="encryptHandler()" />
231: <mx:Spacer width="100%" />
232: 233: <mx:Button id="selectFileBtn" click="selectFileHandler()" label="选择文件" />
234: <mx:Button id="selectDirectoryBtn" click="selectDirectoryHandler()" label="选择文件夹" />
235: 236: </mx:HBox> 237: 238: <mx:HBox width="100%" height="100%" horizontalScrollPolicy="off" verticalScrollPolicy="off">
239: 240: <mx:TextArea id="inputTxt" width="100%" height="480" leading="5" letterSpacing="1"
241: borderColor="#eeeeee" borderStyle="solid"
242: paddingTop="5" paddingRight="5" paddingLeft="5" paddingBottom="5" />
243: 244: <mx:TextArea id="outputTxt" width="100%" height="480" leading="5" letterSpacing="1"
245: borderColor="#eeeeee" borderStyle="solid"
246: verticalScrollPolicy="auto"
247: paddingTop="5" paddingRight="5" paddingLeft="5" paddingBottom="5" />
248: 249: </mx:HBox> 250: 251: </mx:VBox> 252: 253: <mx:Canvas width="100%" height="100%" backgroundColor="#000000" backgroundAlpha=".3" visible="false" id="maskPanel">
254: <mx:HBox width="130" height="50" horizontalCenter="0" verticalCenter="0"
255: backgroundColor="#ffffff" verticalAlign="middle" horizontalAlign="center">
256: <mx:Text horizontalCenter="0" verticalCenter="0" text="正在处理..." fontSize="16" fontWeight="bold" color="#3399cc" />
257: </mx:HBox> 258: </mx:Canvas> 259: 260: </mx:Canvas> 转载于:https://www.cnblogs.com/meteoric_cry/archive/2012/04/05/2433782.html
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