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

   1 /**\r
   2  * CFBMode\r
   3  * \r
   4  * An ActionScript 3 implementation of the CFB 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         /**\r
  14          * This is the "full" CFB.\r
  15          * CFB1 and CFB8 are hiding somewhere else.\r
  16          * \r
  17          * Note: The constructor accepts an optional padding argument, but ignores it otherwise.\r
  18          */\r
  19         public class CFBMode extends IVMode implements IMode\r
  20         {\r
  21                 \r
  22                 public function CFBMode(key:ISymmetricKey, padding:IPad = null) {\r
  23                         super(key,null);\r
  24                 }\r
  25 \r
  26                 public function encrypt(src:ByteArray):void\r
  27                 {\r
  28                         var l:uint = src.length;\r
  29                         var vector:ByteArray = getIV4e();\r
  30                         for (var i:uint=0;i<src.length;i+=blockSize) {\r
  31                                 key.encrypt(vector);\r
  32                                 var chunk:uint = (i+blockSize<l)?blockSize:l-i;\r
  33                                 for (var j:uint=0;j<chunk;j++) {\r
  34                                         src[i+j] ^= vector[j];\r
  35                                 }\r
  36                                 vector.position=0;\r
  37                                 vector.writeBytes(src, i, chunk);\r
  38                         }\r
  39                 }\r
  40                 \r
  41                 public function decrypt(src:ByteArray):void\r
  42                 {\r
  43                         var l:uint = src.length;\r
  44                         var vector:ByteArray = getIV4d();\r
  45                         var tmp:ByteArray = new ByteArray;\r
  46                         for (var i:uint=0;i<src.length;i+=blockSize) {\r
  47                                 key.encrypt(vector);\r
  48                                 var chunk:uint = (i+blockSize<l)?blockSize:l-i;\r
  49                                 tmp.position=0;\r
  50                                 tmp.writeBytes(src, i, chunk);\r
  51                                 for (var j:uint=0;j<chunk;j++) {\r
  52                                         src[i+j] ^= vector[j];\r
  53                                 }\r
  54                                 vector.position=0;\r
  55                                 vector.writeBytes(tmp);\r
  56                         }\r
  57                 }\r
  58                 \r
  59                 public function toString():String {\r
  60                         return key.toString()+"-cfb";\r
  61                 }\r
  62 \r
  63         }\r
  64 }