From ef68436ac04da078ffdcacd7e1f785473a303d45 Mon Sep 17 00:00:00 2001
From: Giulio Cesare Solaroli <giulio.cesare@clipperz.com>
Date: Sun, 02 Oct 2011 23:56:18 +0000
Subject: First version of the newly restructured repository

---
(limited to 'frontend/beta/js/Clipperz/Crypto/PRNG.js')

diff --git a/frontend/beta/js/Clipperz/Crypto/PRNG.js b/frontend/beta/js/Clipperz/Crypto/PRNG.js
new file mode 100644
index 0000000..770ceb1
--- a/dev/null
+++ b/frontend/beta/js/Clipperz/Crypto/PRNG.js
@@ -0,0 +1,854 @@
+/*
+
+Copyright 2008-2011 Clipperz Srl
+
+This file is part of Clipperz's Javascript Crypto Library.
+Javascript Crypto Library provides web developers with an extensive
+and efficient set of cryptographic functions. The library aims to
+obtain maximum execution speed while preserving modularity and
+reusability.
+For further information about its features and functionalities please
+refer to http://www.clipperz.com
+
+* Javascript Crypto Library is free software: you can redistribute
+  it and/or modify it under the terms of the GNU Affero General Public
+  License as published by the Free Software Foundation, either version
+  3 of the License, or (at your option) any later version.
+
+* Javascript Crypto Library is distributed in the hope that it will
+  be useful, but WITHOUT ANY WARRANTY; without even the implied
+  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Affero General Public License for more details.
+
+* You should have received a copy of the GNU Affero General Public
+  License along with Javascript Crypto Library.  If not, see
+  <http://www.gnu.org/licenses/>.
+
+*/
+
+try { if (typeof(Clipperz.ByteArray) == 'undefined') { throw ""; }} catch (e) {
+	throw "Clipperz.Crypto.PRNG depends on Clipperz.ByteArray!";
+}  
+
+try { if (typeof(Clipperz.Crypto.SHA) == 'undefined') { throw ""; }} catch (e) {
+	throw "Clipperz.Crypto.PRNG depends on Clipperz.Crypto.SHA!";
+}  
+
+try { if (typeof(Clipperz.Crypto.AES) == 'undefined') { throw ""; }} catch (e) {
+	throw "Clipperz.Crypto.PRNG depends on Clipperz.Crypto.AES!";
+}  
+
+if (typeof(Clipperz.Crypto.PRNG) == 'undefined') { Clipperz.Crypto.PRNG = {}; }
+
+//#############################################################################
+
+Clipperz.Crypto.PRNG.EntropyAccumulator = function(args) {
+	args = args || {};
+//	MochiKit.Base.bindMethods(this);
+
+	this._stack = new Clipperz.ByteArray();
+	this._maxStackLengthBeforeHashing = args.maxStackLengthBeforeHashing || 256;
+	return this;
+}
+
+Clipperz.Crypto.PRNG.EntropyAccumulator.prototype = MochiKit.Base.update(null, {
+
+	'toString': function() {
+		return "Clipperz.Crypto.PRNG.EntropyAccumulator";
+	},
+
+	//-------------------------------------------------------------------------
+
+	'stack': function() {
+		return this._stack;
+	},
+	
+	'setStack': function(aValue) {
+		this._stack = aValue;
+	},
+
+	'resetStack': function() {
+		this.stack().reset();
+	},
+	
+	'maxStackLengthBeforeHashing': function() {
+		return this._maxStackLengthBeforeHashing;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'addRandomByte': function(aValue) {
+		this.stack().appendByte(aValue);
+				
+		if (this.stack().length() > this.maxStackLengthBeforeHashing()) {
+			this.setStack(Clipperz.Crypto.SHA.sha_d256(this.stack()));
+		}
+	},
+	
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//#############################################################################
+
+Clipperz.Crypto.PRNG.RandomnessSource = function(args) {
+	args = args || {};
+	MochiKit.Base.bindMethods(this);
+
+	this._generator = args.generator || null;
+	this._sourceId = args.sourceId || null;
+	this._boostMode = args.boostMode || false;
+	
+	this._nextPoolIndex = 0;
+	
+	return this;
+}
+
+Clipperz.Crypto.PRNG.RandomnessSource.prototype = MochiKit.Base.update(null, {
+
+	'generator': function() {
+		return this._generator;
+	},
+
+	'setGenerator': function(aValue) {
+		this._generator = aValue;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'boostMode': function() {
+		return this._boostMode;
+	},
+	
+	'setBoostMode': function(aValue) {
+		this._boostMode = aValue;
+	},
+	
+	//-------------------------------------------------------------------------
+	
+	'sourceId': function() {
+		return this._sourceId;
+	},
+
+	'setSourceId': function(aValue) {
+		this._sourceId = aValue;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'nextPoolIndex': function() {
+		return this._nextPoolIndex;
+	},
+	
+	'incrementNextPoolIndex': function() {
+		this._nextPoolIndex = ((this._nextPoolIndex + 1) % this.generator().numberOfEntropyAccumulators());
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'updateGeneratorWithValue': function(aRandomValue) {
+		if (this.generator() != null) {
+			this.generator().addRandomByte(this.sourceId(), this.nextPoolIndex(), aRandomValue);
+			this.incrementNextPoolIndex();
+		}
+	},
+	
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//#############################################################################
+	
+Clipperz.Crypto.PRNG.TimeRandomnessSource = function(args) {
+	args = args || {};
+//	MochiKit.Base.bindMethods(this);
+
+	this._intervalTime = args.intervalTime || 1000;
+	
+	Clipperz.Crypto.PRNG.RandomnessSource.call(this, args);
+
+	this.collectEntropy();
+	return this;
+}
+
+Clipperz.Crypto.PRNG.TimeRandomnessSource.prototype = MochiKit.Base.update(new Clipperz.Crypto.PRNG.RandomnessSource, {
+
+	'intervalTime': function() {
+		return this._intervalTime;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'collectEntropy': function() {
+		var	now;
+		var	entropyByte;
+		var intervalTime;
+		now = new Date();
+		entropyByte = (now.getTime() & 0xff);
+		
+		intervalTime = this.intervalTime();
+		if (this.boostMode() == true) {
+			intervalTime = intervalTime / 9;
+		}
+		
+		this.updateGeneratorWithValue(entropyByte);
+		setTimeout(this.collectEntropy, intervalTime);
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'numberOfRandomBits': function() {
+		return 5;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'pollingFrequency': function() {
+		return 10;
+	},
+
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//*****************************************************************************
+
+Clipperz.Crypto.PRNG.MouseRandomnessSource = function(args) {
+	args = args || {};
+
+	Clipperz.Crypto.PRNG.RandomnessSource.call(this, args);
+
+	this._numberOfBitsToCollectAtEachEvent = 4;
+	this._randomBitsCollector = 0;
+	this._numberOfRandomBitsCollected = 0;
+	
+	MochiKit.Signal.connect(document, 'onmousemove', this, 'collectEntropy');
+
+	return this;
+}
+
+Clipperz.Crypto.PRNG.MouseRandomnessSource.prototype = MochiKit.Base.update(new Clipperz.Crypto.PRNG.RandomnessSource, {
+
+	//-------------------------------------------------------------------------
+
+	'numberOfBitsToCollectAtEachEvent': function() {
+		return this._numberOfBitsToCollectAtEachEvent;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'randomBitsCollector': function() {
+		return this._randomBitsCollector;
+	},
+
+	'setRandomBitsCollector': function(aValue) {
+		this._randomBitsCollector = aValue;
+	},
+
+	'appendRandomBitsToRandomBitsCollector': function(aValue) {
+		var collectedBits;
+		var numberOfRandomBitsCollected;
+		
+		numberOfRandomBitsCollected = this.numberOfRandomBitsCollected();
+		collectetBits = this.randomBitsCollector() | (aValue << numberOfRandomBitsCollected);
+		this.setRandomBitsCollector(collectetBits);
+		numberOfRandomBitsCollected += this.numberOfBitsToCollectAtEachEvent();
+		
+		if (numberOfRandomBitsCollected == 8) {
+			this.updateGeneratorWithValue(collectetBits);
+			numberOfRandomBitsCollected = 0;
+			this.setRandomBitsCollector(0);
+		}
+		
+		this.setNumberOfRandomBitsCollected(numberOfRandomBitsCollected)
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'numberOfRandomBitsCollected': function() {
+		return this._numberOfRandomBitsCollected;
+	},
+
+	'setNumberOfRandomBitsCollected': function(aValue) {
+		this._numberOfRandomBitsCollected = aValue;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'collectEntropy': function(anEvent) {
+		var mouseLocation;
+		var randomBit;
+		var mask;
+		
+		mask = 0xffffffff >>> (32 - this.numberOfBitsToCollectAtEachEvent());
+		
+		mouseLocation = anEvent.mouse().client;
+		randomBit = ((mouseLocation.x ^ mouseLocation.y) & mask);
+		this.appendRandomBitsToRandomBitsCollector(randomBit)
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'numberOfRandomBits': function() {
+		return 1;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'pollingFrequency': function() {
+		return 10;
+	},
+
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//*****************************************************************************
+
+Clipperz.Crypto.PRNG.KeyboardRandomnessSource = function(args) {
+	args = args || {};
+	Clipperz.Crypto.PRNG.RandomnessSource.call(this, args);
+
+	this._randomBitsCollector = 0;
+	this._numberOfRandomBitsCollected = 0;
+	
+	MochiKit.Signal.connect(document, 'onkeypress', this, 'collectEntropy');
+
+	return this;
+}
+
+Clipperz.Crypto.PRNG.KeyboardRandomnessSource.prototype = MochiKit.Base.update(new Clipperz.Crypto.PRNG.RandomnessSource, {
+
+	//-------------------------------------------------------------------------
+
+	'randomBitsCollector': function() {
+		return this._randomBitsCollector;
+	},
+
+	'setRandomBitsCollector': function(aValue) {
+		this._randomBitsCollector = aValue;
+	},
+
+	'appendRandomBitToRandomBitsCollector': function(aValue) {
+		var collectedBits;
+		var numberOfRandomBitsCollected;
+		
+		numberOfRandomBitsCollected = this.numberOfRandomBitsCollected();
+		collectetBits = this.randomBitsCollector() | (aValue << numberOfRandomBitsCollected);
+		this.setRandomBitsCollector(collectetBits);
+		numberOfRandomBitsCollected ++;
+		
+		if (numberOfRandomBitsCollected == 8) {
+			this.updateGeneratorWithValue(collectetBits);
+			numberOfRandomBitsCollected = 0;
+			this.setRandomBitsCollector(0);
+		}
+		
+		this.setNumberOfRandomBitsCollected(numberOfRandomBitsCollected)
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'numberOfRandomBitsCollected': function() {
+		return this._numberOfRandomBitsCollected;
+	},
+
+	'setNumberOfRandomBitsCollected': function(aValue) {
+		this._numberOfRandomBitsCollected = aValue;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'collectEntropy': function(anEvent) {
+/*
+		var mouseLocation;
+		var randomBit;
+		
+		mouseLocation = anEvent.mouse().client;
+			
+		randomBit = ((mouseLocation.x ^ mouseLocation.y) & 0x1);
+		this.appendRandomBitToRandomBitsCollector(randomBit);
+*/
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'numberOfRandomBits': function() {
+		return 1;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'pollingFrequency': function() {
+		return 10;
+	},
+
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//#############################################################################
+
+Clipperz.Crypto.PRNG.Fortuna = function(args) {
+	var	i,c;
+	
+	args = args || {};
+
+	this._key = args.seed || null;
+	if (this._key == null) {
+		this._counter = 0;
+		this._key = new Clipperz.ByteArray();
+	} else {
+		this._counter = 1;
+	}
+	
+	this._aesKey = null;
+	
+	this._firstPoolReseedLevel = args.firstPoolReseedLevel || 32 || 64;
+	this._numberOfEntropyAccumulators = args.numberOfEntropyAccumulators || 32;
+	
+	this._accumulators = [];
+	c = this.numberOfEntropyAccumulators();
+	for (i=0; i<c; i++) {
+		this._accumulators.push(new Clipperz.Crypto.PRNG.EntropyAccumulator());
+	}
+
+	this._randomnessSources = [];
+	this._reseedCounter = 0;
+	
+	return this;
+}
+
+Clipperz.Crypto.PRNG.Fortuna.prototype = MochiKit.Base.update(null, {
+
+	'toString': function() {
+		return "Clipperz.Crypto.PRNG.Fortuna";
+	},
+
+	//-------------------------------------------------------------------------
+
+	'key': function() {
+		return this._key;
+	},
+
+	'setKey': function(aValue) {
+		this._key = aValue;
+		this._aesKey = null;
+	},
+	
+	'aesKey': function() {
+		if (this._aesKey == null) {
+			this._aesKey = new Clipperz.Crypto.AES.Key({key:this.key()});
+		}
+		
+		return this._aesKey;
+	},
+	
+	'accumulators': function() {
+		return this._accumulators;
+	},
+	
+	'firstPoolReseedLevel': function() {
+		return this._firstPoolReseedLevel;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'reseedCounter': function() {
+		return this._reseedCounter;
+	},
+
+	'incrementReseedCounter': function() {
+		this._reseedCounter = this._reseedCounter +1;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'reseed': function() {
+		var	newKeySeed;
+		var reseedCounter;
+		var	reseedCounterMask;
+		var i, c;
+		
+		newKeySeed = this.key();
+		this.incrementReseedCounter();
+		reseedCounter = this.reseedCounter();
+		
+		c = this.numberOfEntropyAccumulators();
+		reseedCounterMask = 0xffffffff >>> (32 - c);
+		for (i=0; i<c; i++) {
+			if ((i == 0) || ((reseedCounter & (reseedCounterMask >>> (c - i))) == 0)) {
+				newKeySeed.appendBlock(this.accumulators()[i].stack());
+				this.accumulators()[i].resetStack();
+			} 
+		}
+		
+		if (reseedCounter == 1) {
+			c = this.randomnessSources().length;
+			for (i=0; i<c; i++) {
+				this.randomnessSources()[i].setBoostMode(false);
+			}
+		}
+		
+		this.setKey(Clipperz.Crypto.SHA.sha_d256(newKeySeed));
+		if (reseedCounter == 1) {
+MochiKit.Logging.logDebug("### PRNG.readyToGenerateRandomBytes");
+			MochiKit.Signal.signal(this, 'readyToGenerateRandomBytes');
+		}
+		MochiKit.Signal.signal(this, 'reseeded');
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'isReadyToGenerateRandomValues': function() {
+		return this.reseedCounter() != 0;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'entropyLevel': function() {
+		return this.accumulators()[0].stack().length() + (this.reseedCounter() * this.firstPoolReseedLevel());
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'counter': function() {
+		return this._counter;
+	},
+	
+	'incrementCounter': function() {
+		this._counter += 1;
+	},
+	
+	'counterBlock': function() {
+		var result;
+
+		result = new Clipperz.ByteArray().appendWords(this.counter(), 0, 0, 0);
+		
+		return result;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'getRandomBlock': function() {
+		var result;
+
+		result = new Clipperz.ByteArray(Clipperz.Crypto.AES.encryptBlock(this.aesKey(), this.counterBlock().arrayValues()));
+		this.incrementCounter();
+		
+		return result;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'getRandomBytes': function(aSize) {
+		var result;
+
+		if (this.isReadyToGenerateRandomValues()) {
+			var i,c;
+			var newKey;
+			
+			result = new Clipperz.ByteArray();
+		
+			c = Math.ceil(aSize / (128 / 8));
+			for (i=0; i<c; i++) {
+				result.appendBlock(this.getRandomBlock());
+			}
+
+			if (result.length() != aSize) {
+				result = result.split(0, aSize);
+			}
+			
+			newKey = this.getRandomBlock().appendBlock(this.getRandomBlock());
+			this.setKey(newKey);
+		} else {
+MochiKit.Logging.logWarning("Fortuna generator has not enough entropy, yet!");
+			throw Clipperz.Crypto.PRNG.exception.NotEnoughEntropy;
+		}
+
+		return result;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'addRandomByte': function(aSourceId, aPoolId, aRandomValue) {
+		var	selectedAccumulator;
+
+		selectedAccumulator = this.accumulators()[aPoolId];
+		selectedAccumulator.addRandomByte(aRandomValue);
+
+		if (aPoolId == 0) {
+			MochiKit.Signal.signal(this, 'addedRandomByte')
+			if (selectedAccumulator.stack().length() > this.firstPoolReseedLevel()) {
+				this.reseed();
+			}
+		}
+	},
+
+	//-------------------------------------------------------------------------
+	
+	'numberOfEntropyAccumulators': function() {
+		return this._numberOfEntropyAccumulators;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'randomnessSources': function() {
+		return this._randomnessSources;
+	},
+	
+	'addRandomnessSource': function(aRandomnessSource) {
+		aRandomnessSource.setGenerator(this);
+		aRandomnessSource.setSourceId(this.randomnessSources().length);
+		this.randomnessSources().push(aRandomnessSource);
+		
+		if (this.isReadyToGenerateRandomValues() == false) {
+			aRandomnessSource.setBoostMode(true);
+		}
+	},
+
+	//-------------------------------------------------------------------------
+
+	'deferredEntropyCollection': function(aValue) {
+		var result;
+
+//MochiKit.Logging.logDebug(">>> PRNG.deferredEntropyCollection");
+
+		if (this.isReadyToGenerateRandomValues()) {
+//MochiKit.Logging.logDebug("--- PRNG.deferredEntropyCollection - 1");
+			result = aValue;
+		} else {
+//MochiKit.Logging.logDebug("--- PRNG.deferredEntropyCollection - 2");
+			var deferredResult;
+
+			Clipperz.NotificationCenter.notify(this, 'updatedProgressState', 'collectingEntropy', true);
+
+			deferredResult = new MochiKit.Async.Deferred();
+//			deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.2.1 - PRNG.deferredEntropyCollection - 1: " + res); return res;});
+			deferredResult.addCallback(MochiKit.Base.partial(MochiKit.Async.succeed, aValue));
+//			deferredResult.addBoth(function(res) {MochiKit.Logging.logDebug("1.2.2 - PRNG.deferredEntropyCollection - 2: " + res); return res;});
+			MochiKit.Signal.connect(this,
+									'readyToGenerateRandomBytes',
+									deferredResult,
+									'callback');
+									
+			result = deferredResult;
+		}
+//MochiKit.Logging.logDebug("<<< PRNG.deferredEntropyCollection - result: " + result);
+
+		return result;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'fastEntropyAccumulationForTestingPurpose': function() {
+		while (! this.isReadyToGenerateRandomValues()) {
+			this.addRandomByte(Math.floor(Math.random() * 32), Math.floor(Math.random() * 32), Math.floor(Math.random() * 256));
+		}
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'dump': function(appendToDoc) {
+		var tbl;
+		var i,c;
+		
+		tbl = document.createElement("table");
+		tbl.border = 0;
+		with (tbl.style) {
+			border = "1px solid lightgrey";
+			fontFamily = 'Helvetica, Arial, sans-serif';
+			fontSize = '8pt';
+			//borderCollapse = "collapse";
+		}
+		var hdr = tbl.createTHead();
+		var hdrtr = hdr.insertRow(0);
+		// document.createElement("tr");
+		{
+			var ntd;
+			
+			ntd = hdrtr.insertCell(0);
+			ntd.style.borderBottom = "1px solid lightgrey";
+			ntd.style.borderRight = "1px solid lightgrey";
+			ntd.appendChild(document.createTextNode("#"));
+
+			ntd = hdrtr.insertCell(1);
+			ntd.style.borderBottom = "1px solid lightgrey";
+			ntd.style.borderRight = "1px solid lightgrey";
+			ntd.appendChild(document.createTextNode("s"));
+
+			ntd = hdrtr.insertCell(2);
+			ntd.colSpan = this.firstPoolReseedLevel();
+			ntd.style.borderBottom = "1px solid lightgrey";
+			ntd.style.borderRight = "1px solid lightgrey";
+			ntd.appendChild(document.createTextNode("base values"));
+			
+			ntd = hdrtr.insertCell(3);
+			ntd.colSpan = 20;
+			ntd.style.borderBottom = "1px solid lightgrey";
+			ntd.appendChild(document.createTextNode("extra values"));
+
+		}
+
+		c = this.accumulators().length;
+		for (i=0; i<c ; i++) {
+			var	currentAccumulator;
+			var bdytr;
+			var bdytd;
+			var ii, cc;
+
+			currentAccumulator = this.accumulators()[i]
+			
+			bdytr = tbl.insertRow(true);
+			
+			bdytd = bdytr.insertCell(0);
+			bdytd.style.borderRight = "1px solid lightgrey";
+			bdytd.style.color = "lightgrey";
+			bdytd.appendChild(document.createTextNode("" + i));
+
+			bdytd = bdytr.insertCell(1);
+			bdytd.style.borderRight = "1px solid lightgrey";
+			bdytd.style.color = "gray";
+			bdytd.appendChild(document.createTextNode("" + currentAccumulator.stack().length()));
+
+
+			cc = Math.max(currentAccumulator.stack().length(), this.firstPoolReseedLevel());
+			for (ii=0; ii<cc; ii++) {
+				var cellText;
+				
+				bdytd = bdytr.insertCell(ii + 2);
+				
+				if (ii < currentAccumulator.stack().length()) {
+					cellText = Clipperz.ByteArray.byteToHex(currentAccumulator.stack().byteAtIndex(ii));
+				} else {
+					cellText = "_";
+				}
+				
+				if (ii == (this.firstPoolReseedLevel() - 1)) {
+					bdytd.style.borderRight = "1px solid lightgrey";
+				}
+				
+				bdytd.appendChild(document.createTextNode(cellText));
+			}
+			
+		}
+		
+
+		if (appendToDoc) {
+			var ne = document.createElement("div");
+			ne.id = "entropyGeneratorStatus";
+			with (ne.style) {
+				fontFamily = "Courier New, monospace";
+				fontSize = "12px";
+				lineHeight = "16px";
+				borderTop = "1px solid black";
+				padding = "10px";
+			}
+			if (document.getElementById(ne.id)) {
+				MochiKit.DOM.swapDOM(ne.id, ne);
+			} else {
+				document.body.appendChild(ne);
+			}
+			ne.appendChild(tbl);
+		}
+
+		return tbl;
+	},
+
+	//-----------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//#############################################################################
+
+Clipperz.Crypto.PRNG.Random = function(args) {
+	args = args || {};
+//	MochiKit.Base.bindMethods(this);
+
+	return this;
+}
+
+Clipperz.Crypto.PRNG.Random.prototype = MochiKit.Base.update(null, {
+
+	'toString': function() {
+		return "Clipperz.Crypto.PRNG.Random";
+	},
+
+	//-------------------------------------------------------------------------
+
+	'getRandomBytes': function(aSize) {
+//Clipperz.Profile.start("Clipperz.Crypto.PRNG.Random.getRandomBytes");
+		var	result;
+		var i,c;
+		
+		result = new Clipperz.ByteArray()
+		c = aSize || 1;
+		for (i=0; i<c; i++) {
+			result.appendByte((Math.random()*255) & 0xff);
+		}
+		
+//Clipperz.Profile.stop("Clipperz.Crypto.PRNG.Random.getRandomBytes");
+		return result;
+	},
+
+	//-------------------------------------------------------------------------
+	__syntaxFix__: "syntax fix"
+});
+
+//#############################################################################
+
+_clipperz_crypt_prng_defaultPRNG = null;
+
+Clipperz.Crypto.PRNG.defaultRandomGenerator = function() {
+	if (_clipperz_crypt_prng_defaultPRNG == null) {
+		_clipperz_crypt_prng_defaultPRNG = new Clipperz.Crypto.PRNG.Fortuna();
+
+		//.............................................................
+		//
+		//		TimeRandomnessSource
+		//
+		//.............................................................
+		{
+			var newRandomnessSource;
+		
+			newRandomnessSource = new Clipperz.Crypto.PRNG.TimeRandomnessSource({intervalTime:111});
+			_clipperz_crypt_prng_defaultPRNG.addRandomnessSource(newRandomnessSource);
+		}
+
+		//.............................................................
+		//
+		//		MouseRandomnessSource
+		//
+		//.............................................................
+		{
+			var	newRandomnessSource;
+			
+			newRandomnessSource = new Clipperz.Crypto.PRNG.MouseRandomnessSource();
+			_clipperz_crypt_prng_defaultPRNG.addRandomnessSource(newRandomnessSource);
+		}
+
+		//.............................................................
+		//
+		//		KeyboardRandomnessSource
+		//
+		//.............................................................
+		{
+			var	newRandomnessSource;
+			
+			newRandomnessSource = new Clipperz.Crypto.PRNG.KeyboardRandomnessSource();
+			_clipperz_crypt_prng_defaultPRNG.addRandomnessSource(newRandomnessSource);
+		}
+
+	}
+
+	return _clipperz_crypt_prng_defaultPRNG;
+};
+
+//#############################################################################
+
+Clipperz.Crypto.PRNG.exception =  {
+	NotEnoughEntropy: new MochiKit.Base.NamedError("Clipperz.Crypto.PRNG.exception.NotEnoughEntropy") 
+};
+
+
+MochiKit.DOM.addLoadEvent(Clipperz.Crypto.PRNG.defaultRandomGenerator);
--
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