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root / trunk / web / dojo / dojox / math / random / Secure.js @ 12

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1 9 andrej.cim
/*
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        Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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        Available via Academic Free License >= 2.1 OR the modified BSD license.
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        see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojox.math.random.Secure"]){
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dojo._hasResource["dojox.math.random.Secure"]=true;
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dojo.provide("dojox.math.random.Secure");
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dojo.declare("dojox.math.random.Secure",null,{constructor:function(_1,_2){
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this.prng=_1;
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var p=this.pool=new Array(_1.size);
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this.pptr=0;
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for(var i=0,_3=_1.size;i<_3;){
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var t=Math.floor(65536*Math.random());
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p[i++]=t>>>8;
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p[i++]=t&255;
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}
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this.seedTime();
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if(!_2){
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this.h=[dojo.connect(dojo.body(),"onclick",this,"seedTime"),dojo.connect(dojo.body(),"onkeypress",this,"seedTime")];
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}
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},destroy:function(){
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if(this.h){
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dojo.forEach(this.h,dojo.disconnect);
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}
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},nextBytes:function(_4){
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var _5=this.state;
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if(!_5){
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this.seedTime();
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_5=this.state=this.prng();
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_5.init(this.pool);
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for(var p=this.pool,i=0,_6=p.length;i<_6;p[i++]=0){
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}
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this.pptr=0;
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}
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for(var i=0,_6=_4.length;i<_6;++i){
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_4[i]=_5.next();
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}
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},seedTime:function(){
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this._seed_int(new Date().getTime());
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},_seed_int:function(x){
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var p=this.pool,i=this.pptr;
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p[i++]^=x&255;
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p[i++]^=(x>>8)&255;
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p[i++]^=(x>>16)&255;
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p[i++]^=(x>>24)&255;
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if(i>=this.prng.size){
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i-=this.prng.size;
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}
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this.pptr=i;
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}});
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}