vnfmarket/src/main/webapp/vnfmarket/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/symmetric/OFBMode.as

   1 /**\r
   2  * OFBMode\r
   3  * \r
   4  * An ActionScript 3 implementation of the OFB confidentiality mode\r
   5  * Copyright (c) 2007 Henri Torgemane\r
   6  * \r
   7  * See LICENSE.txt for full license information.\r
   8  */\r
   9 package com.hurlant.crypto.symmetric\r
  10 {\r
  11         import flash.utils.ByteArray;\r
  12 \r
  13         public class OFBMode extends IVMode implements IMode\r
  14         {\r
  15                 public function OFBMode(key:ISymmetricKey, padding:IPad=null)\r
  16                 {\r
  17                         super(key, null);\r
  18                 }\r
  19                 \r
  20                 public function encrypt(src:ByteArray):void\r
  21                 {\r
  22                         var vector:ByteArray = getIV4e();\r
  23                         core(src, vector);\r
  24                 }\r
  25                 \r
  26                 public function decrypt(src:ByteArray):void\r
  27                 {\r
  28                         var vector:ByteArray = getIV4d();\r
  29                         core(src, vector);\r
  30                 }\r
  31                 \r
  32                 private function core(src:ByteArray, iv:ByteArray):void { \r
  33                         var l:uint = src.length;\r
  34                         var tmp:ByteArray = new ByteArray;\r
  35                         for (var i:uint=0;i<src.length;i+=blockSize) {\r
  36                                 key.encrypt(iv);\r
  37                                 tmp.position=0;\r
  38                                 tmp.writeBytes(iv);\r
  39                                 var chunk:uint = (i+blockSize<l)?blockSize:l-i;\r
  40                                 for (var j:uint=0;j<chunk;j++) {\r
  41                                         src[i+j] ^= iv[j];\r
  42                                 }\r
  43                                 iv.position=0;\r
  44                                 iv.writeBytes(tmp);\r
  45                         }\r
  46                 }\r
  47                 public function toString():String {\r
  48                         return key.toString()+"-ofb";\r
  49                 }\r
  50                 \r
  51         }\r
  52 }