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/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.security.otp;
import java.security.GeneralSecurityException;
import java.util.Calendar;
import java.util.TimeZone;
/**
* Utility class associated with the {@code TimeBasedOTP} class
* @author [email protected]
* @since Sep 20, 2010
*/
public class TimeBasedOTPUtil
{
private static long TIME_INTERVAL = 30 * 1000; //30 secs
/**
* Validate a submitted OTP string
* @param submittedOTP OTP string to validate
* @param secret Shared secret
* @return
* @throws GeneralSecurityException
*/
public static boolean validate( String submittedOTP, byte[] secret, int numDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
String generatedTOTP = TimeBasedOTP.generateTOTP( new String( secret ) , numDigits );
boolean result = generatedTOTP.equals( submittedOTP );
long timeInMilis = currentDateTime.getTimeInMillis();
if( !result )
{
timeInMilis -= TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
if( !result )
{
timeInMilis += TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
return result;
}
/**
* Validate a submitted OTP string using HMAC_256
* @param submittedOTP OTP string to validate
* @param secret Shared secret
* @return
* @throws GeneralSecurityException
*/
public static boolean validate256( String submittedOTP, byte[] secret, int numDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
String generatedTOTP = TimeBasedOTP.generateTOTP256( new String( secret ) , numDigits );
boolean result = generatedTOTP.equals( submittedOTP );
if( !result )
{
//Step back time interval
long timeInMilis = currentDateTime.getTimeInMillis();
timeInMilis -= TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP256( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
if( !result )
{
//Step ahead time interval
long timeInMilis = currentDateTime.getTimeInMillis();
timeInMilis += TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP256( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
return result;
}
/**
* Validate a submitted OTP string using HMAC_512
* @param submittedOTP OTP string to validate
* @param secret Shared secret
* @return
* @throws GeneralSecurityException
*/
public static boolean validate512( String submittedOTP, byte[] secret, int numDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
String generatedTOTP = TimeBasedOTP.generateTOTP512( new String( secret ) , numDigits );
boolean result = generatedTOTP.equals( submittedOTP );
if( !result )
{
//Step back time interval
long timeInMilis = currentDateTime.getTimeInMillis();
timeInMilis -= TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP512( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
if( !result )
{
//Step ahead time interval
long timeInMilis = currentDateTime.getTimeInMillis();
timeInMilis += TIME_INTERVAL;
generatedTOTP = TimeBasedOTP.generateTOTP512( new String( secret ) , "" + timeInMilis, numDigits );
result = generatedTOTP.equals( submittedOTP );
}
return result;
}
}
