First version of the newly restructured repository

frontend/gamma/js/Clipperz/PM/Toll.js

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+/*
+
+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/>.
+
+*/
+
+if (typeof(Clipperz) == 'undefined') { Clipperz = {}; }
+if (typeof(Clipperz.PM) == 'undefined') { Clipperz.PM = {}; }
+
+//=============================================================================
+
+Clipperz.PM.Toll = function(args) {
+	args = args || {};
+
+	this._requestType = args.requestType;
+	this._targetValue = args.targetValue;
+	this._cost = args.cost;
+	this._toll = null;
+
+	return this;
+}
+
+Clipperz.PM.Toll.prototype = MochiKit.Base.update(null, {
+
+	'toString': function() {
+		return "Clipperz.PM.Toll (" + this.requestType() + ": " + this.cost() + " - " + ((this.toll() == null)? 'UNPAID' : 'PAID') + ")";
+	},
+
+	//-------------------------------------------------------------------------
+
+	'requestType': function() {
+		return this._requestType;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'targetValue': function() {
+		return this._targetValue;
+	},
+
+	//-------------------------------------------------------------------------
+
+	'cost': function() {
+		return this._cost;
+	},
+	
+	//-------------------------------------------------------------------------
+
+	'toll': function() {
+		return this._toll;
+	},
+
+	//-------------------------------------------------------------------------
+/*
+	'__pay': function() {
+		var	result;
+		var	targetData;
+		var	targetMatchSize;
+		var prefixMatchingBits;
+		var	payment;
+		var i;
+		
+		if (this.toll() == null) {
+			i = 0;
+			targetData = new Clipperz.ByteArray("0x" + this.targetValue());
+			targetMatchSize = this.cost();
+		
+			payment = Clipperz.Crypto.PRNG.defaultRandomGenerator().getRandomBytes(32);
+		
+			do {
+				var	paymentData;
+
+				//payment = Clipperz.Crypto.PRNG.defaultRandomGenerator().getRandomBytes(32);
+				payment.increment();
+				paymentData = Clipperz.Crypto.SHA.sha256(payment);
+//				prefixMatchingBits = this.prefixMatchingBits(targetData, paymentData);
+				prefixMatchingBits = Clipperz.ByteArray.prefixMatchingBits(targetData, paymentData);
+				i++;
+			} while (prefixMatchingBits < targetMatchSize);
+
+			this._toll = payment.toHexString().substring(2)
+		}
+
+		return this;
+	},
+*/	
+	//-------------------------------------------------------------------------
+
+	'innerDeferredPay': function (aTargetValue, aCost, aPayment) {
+		var deferredResult;
+		var result;
+		var payment;
+		var i;
+
+		result = null;
+		payment = aPayment;
+		i = 0;
+
+		while ((result == null) && (i < Clipperz.PM.Toll.numberOfCloseLoopIterations)) {
+			if (Clipperz.ByteArray.prefixMatchingBits(aTargetValue, Clipperz.Crypto.SHA.sha256(payment)) > aCost) {
+				result = payment;
+			} else {
+				payment.increment();
+			}
+
+			i ++;
+		}
+		
+		if (result == null) {
+			deferredResult = MochiKit.Async.callLater(Clipperz.PM.Toll.pauseBetweenEachCloseLoop, MochiKit.Base.method(this, 'innerDeferredPay', aTargetValue, aCost, aPayment));
+		} else {
+			deferredResult = MochiKit.Async.succeed(result);
+		}
+		
+		return deferredResult;
+	},
+
+	'deferredPay': function () {
+		var	deferredResult;
+		var	toll;
+		
+		toll = this;
+		deferredResult = new Clipperz.Async.Deferred("Toll.deferredPay");
+//deferredResult.addLog("--->>> deferredPay - " + this.cost());
+		deferredResult.addMethod(Clipperz.Crypto.PRNG.defaultRandomGenerator(), 'getRandomBytes', 32);
+		deferredResult.addMethod(toll, 'innerDeferredPay', new Clipperz.ByteArray("0x" + this.targetValue()), this.cost());
+		deferredResult.addCallback(MochiKit.Base.bind(function(aPayment) {
+			var result;
+		
+			result = {
+				targetValue: this.targetValue(),
+				toll: aPayment.toHexString().substr(2)
+			};
+		
+			return result;
+		}, this));
+//deferredResult.addLog("<<<--- deferredPay - " + this.cost());
+		deferredResult.callback();
+		
+		return deferredResult;
+	},
+	
+	//=========================================================================
+	__syntaxFix__: "syntax fix"
+	
+});
+
+
+Clipperz.PM.Toll.validate = function(aTargetValue, aToll, aCost) {
+	var result;
+	var	tollValue;
+	var targetValue;
+	var hashedTollValue;
+	var payedToll;
+	
+	tollValue = new Clipperz.ByteArray("0x" + aToll);
+	targetValue = new Clipperz.ByteArray("0x" + aTargetValue);
+	hashedTollValue = Clipperz.Crypto.SHA.sha256(tollValue);
+	
+	payedToll = Clipperz.ByteArray.prefixMatchingBits(targetValue, hashedTollValue);
+	
+	if (payedToll < aCost) {
+		result = false;
+	} else {
+		result = true;
+	}
+	
+	return result;
+};
+
+Clipperz.PM.Toll.numberOfCloseLoopIterations = 50;
+Clipperz.PM.Toll.pauseBetweenEachCloseLoop = 0.5;