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

   1 /**\r
   2  * XTeaKey\r
   3  * \r
   4  * An ActionScript 3 implementation of the XTea algorithm\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 com.hurlant.crypto.prng.Random;\r
  12         import com.hurlant.util.Memory;\r
  13         \r
  14         import flash.utils.ByteArray;\r
  15         \r
  16         \r
  17         public class XTeaKey implements ISymmetricKey\r
  18         {\r
  19                 public const NUM_ROUNDS:uint = 64;      \r
  20                 private var k:Array;\r
  21 \r
  22                 public function XTeaKey(a:ByteArray) {\r
  23                         a.position=0;\r
  24                         k = [a.readUnsignedInt(),a.readUnsignedInt(),a.readUnsignedInt(),a.readUnsignedInt()];\r
  25                 }\r
  26                 /**\r
  27                  * K is an hex string with 32 digits.\r
  28                  */\r
  29                 public static function parseKey(K:String):XTeaKey {\r
  30                         var a:ByteArray = new ByteArray;\r
  31                         a.writeUnsignedInt(parseInt(K.substr(0,8),16));\r
  32                         a.writeUnsignedInt(parseInt(K.substr(8,8),16));\r
  33                         a.writeUnsignedInt(parseInt(K.substr(16,8),16));\r
  34                         a.writeUnsignedInt(parseInt(K.substr(24,8),16));\r
  35                         a.position = 0;\r
  36                         return new XTeaKey(a);\r
  37                 }\r
  38                 \r
  39                 public function getBlockSize():uint {\r
  40                         return 8;\r
  41                 }\r
  42 \r
  43                 public function encrypt(block:ByteArray, index:uint=0):void {\r
  44                         block.position = index;\r
  45                         var v0:uint = block.readUnsignedInt();\r
  46                         var v1:uint = block.readUnsignedInt();\r
  47                         var i:uint;\r
  48                         var sum:uint =0;\r
  49                         var delta:uint = 0x9E3779B9;\r
  50                         for (i=0; i<NUM_ROUNDS; i++) {\r
  51                                 v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);\r
  52                                 sum += delta;\r
  53                         v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);\r
  54                         }\r
  55                         block.position-=8;\r
  56                         block.writeUnsignedInt(v0);\r
  57                         block.writeUnsignedInt(v1);\r
  58                 }\r
  59                 \r
  60                 public function decrypt(block:ByteArray, index:uint=0):void {\r
  61                         block.position = index;\r
  62                         var v0:uint = block.readUnsignedInt();\r
  63                         var v1:uint = block.readUnsignedInt();\r
  64                         var i:uint;\r
  65                         var delta:uint = 0x9E3779B9;\r
  66                         var sum:uint = delta*NUM_ROUNDS;\r
  67                         for (i=0; i<NUM_ROUNDS; i++) {\r
  68                                 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);\r
  69                                 sum -= delta;\r
  70                                 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);\r
  71                         }\r
  72                         block.position-=8;\r
  73                         block.writeUnsignedInt(v0);\r
  74                         block.writeUnsignedInt(v1);\r
  75                 }\r
  76 \r
  77                 public function dispose():void {\r
  78                         //private var k:Array;\r
  79                         var r:Random = new Random;\r
  80                         for (var i:uint=0;i<k.length;i++) {\r
  81                                 k[i] = r.nextByte();\r
  82                                 delete k[i];\r
  83                         }\r
  84                         k = null;\r
  85                         Memory.gc();\r
  86                 }\r
  87 \r
  88                 public function toString():String {\r
  89                         return "xtea";\r
  90                 }\r
  91         }\r
  92         \r
  93 \r
  94 }