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

   1 /**\r
   2  * Random\r
   3  * \r
   4  * An ActionScript 3 implementation of a Random Number Generator\r
   5  * Copyright (c) 2007 Henri Torgemane\r
   6  * \r
   7  * Derived from:\r
   8  *              The jsbn library, Copyright (c) 2003-2005 Tom Wu\r
   9  * \r
  10  * See LICENSE.txt for full license information.\r
  11  */\r
  12 package com.hurlant.crypto.prng\r
  13 {\r
  14         import flash.utils.ByteArray;\r
  15         import com.hurlant.util.Memory;\r
  16         import flash.system.System;\r
  17         import flash.system.Capabilities;\r
  18         import flash.accessibility.AccessibilityProperties;\r
  19         import flash.display.SWFVersion;\r
  20         import flash.display.Stage;\r
  21         import flash.utils.getTimer;\r
  22         import flash.text.Font;\r
  23         \r
  24         public class Random\r
  25         {\r
  26                 private var state:IPRNG;\r
  27                 private var ready:Boolean = false;\r
  28                 private var pool:ByteArray;\r
  29                 private var psize:int;\r
  30                 private var pptr:int;\r
  31                 private var seeded:Boolean = false;\r
  32                 \r
  33                 public function Random(prng:Class = null) {\r
  34                         if (prng==null) prng = ARC4;\r
  35                         state = new prng as IPRNG;\r
  36                         psize= state.getPoolSize();\r
  37                         pool = new ByteArray;\r
  38                         pptr = 0;\r
  39                         while (pptr <psize) {\r
  40                                 var t:uint = 65536*Math.random();\r
  41                                 pool[pptr++] = t >>> 8;\r
  42                                 pool[pptr++] = t&255;\r
  43                         }\r
  44                         pptr=0;\r
  45                         seed();\r
  46                 }\r
  47                 \r
  48                 public function seed(x:int = 0):void {\r
  49                         if (x==0) {\r
  50                                 x = new Date().getTime();\r
  51                         }\r
  52                         pool[pptr++] ^= x & 255;\r
  53                         pool[pptr++] ^= (x>>8)&255;\r
  54                         pool[pptr++] ^= (x>>16)&255;\r
  55                         pool[pptr++] ^= (x>>24)&255;\r
  56                         pptr %= psize;\r
  57                         seeded = true;\r
  58                 }\r
  59                 \r
  60                 /**\r
  61                  * Gather anything we have that isn't entirely predictable:\r
  62                  *  - memory used\r
  63                  *  - system capabilities\r
  64                  *  - timing stuff\r
  65                  *  - installed fonts\r
  66                  */\r
  67                 public function autoSeed():void {\r
  68                         var b:ByteArray = new ByteArray;\r
  69                         b.writeUnsignedInt(System.totalMemory);\r
  70                         b.writeUTF(Capabilities.serverString);\r
  71                         b.writeUnsignedInt(getTimer());\r
  72                         b.writeUnsignedInt((new Date).getTime());\r
  73                         var a:Array = Font.enumerateFonts(true);\r
  74                         for each (var f:Font in a) {\r
  75                                 b.writeUTF(f.fontName);\r
  76                                 b.writeUTF(f.fontStyle);\r
  77                                 b.writeUTF(f.fontType);\r
  78                         }\r
  79                         b.position=0;\r
  80                         while (b.bytesAvailable>=4) {\r
  81                                 seed(b.readUnsignedInt());\r
  82                         }\r
  83                 }\r
  84                 \r
  85                 \r
  86                 public function nextBytes(buffer:ByteArray, length:int):void {\r
  87                         while (length--) {\r
  88                                 buffer.writeByte(nextByte());\r
  89                         }\r
  90                 }\r
  91                 public function nextByte():int {\r
  92                         if (!ready) {\r
  93                                 if (!seeded) {\r
  94                                         autoSeed();\r
  95                                 }\r
  96                                 state.init(pool);\r
  97                                 pool.length = 0;\r
  98                                 pptr = 0;\r
  99                                 ready = true;\r
 100                         }\r
 101                         return state.next();\r
 102                 }\r
 103                 public function dispose():void {\r
 104                         for (var i:uint=0;i<pool.length;i++) {\r
 105                                 pool[i] = Math.random()*256;\r
 106                         }\r
 107                         pool.length=0;\r
 108                         pool = null;\r
 109                         state.dispose();\r
 110                         state = null;\r
 111                         psize = 0;\r
 112                         pptr = 0;\r
 113                         Memory.gc();\r
 114                 }\r
 115                 public function toString():String {\r
 116                         return "random-"+state.toString();\r
 117                 }\r
 118         }\r
 119 }\r