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

   1 /**\r
   2  * CTRMode\r
   3  * \r
   4  * An ActionScript 3 implementation of the counter 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 CTRMode extends IVMode implements IMode\r
  14         {\r
  15 \r
  16                 public function CTRMode(key:ISymmetricKey, padding:IPad = null) {\r
  17                         super(key, padding);\r
  18                 }\r
  19                 \r
  20                 public function encrypt(src:ByteArray):void\r
  21                 {\r
  22                         padding.pad(src);\r
  23                         var vector:ByteArray = getIV4e();\r
  24                         core(src, vector);\r
  25                 }\r
  26                 \r
  27                 public function decrypt(src:ByteArray):void\r
  28                 {\r
  29                         var vector:ByteArray = getIV4d();\r
  30                         core(src, vector);\r
  31                         padding.unpad(src);\r
  32                 }\r
  33                 \r
  34                 private function core(src:ByteArray, iv:ByteArray):void {\r
  35                         var X:ByteArray = new ByteArray;\r
  36                         var Xenc:ByteArray = new ByteArray;\r
  37                         X.writeBytes(iv);\r
  38                         for (var i:uint=0;i<src.length;i+=blockSize) {\r
  39                                 Xenc.position=0;\r
  40                                 Xenc.writeBytes(X);\r
  41                                 key.encrypt(Xenc);\r
  42                                 for (var j:uint=0;j<blockSize;j++) {\r
  43                                         src[i+j] ^= Xenc[j];\r
  44                                 }\r
  45                                 \r
  46                                 for (j=blockSize-1;j>=0;--j) {\r
  47                                         X[j]++;\r
  48                                         if (X[j]!=0)\r
  49                                                 break;\r
  50                                 }\r
  51                         }\r
  52                 }\r
  53                 public function toString():String {\r
  54                         return key.toString()+"-ctr";\r
  55                 }\r
  56                 \r
  57         }\r
  58 }