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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.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Calendar;
import java.util.TimeZone;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
/**
* TOTP: Time-based One-time Password Algorithm
* Based on http://tools.ietf.org/html/draft-mraihi-totp-timebased-06
*
* @author [email protected]
* @since Sep 20, 2010
*/
public class TimeBasedOTP
{
public static final String HMAC_SHA1 = "HmacSHA1";
public static final String HMAC_SHA256 = "HmacSHA256";
public static final String HMAC_SHA512 = "HmacSHA512";
// 0 1 2 3 4 5 6 7 8
private static final int[] DIGITS_POWER = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
private static int TIME_SLICE_X = 30000;
private static int TIME_ZERO = 0;
/**
* Generate a TOTP value using HMAC_SHA1
* @param key
* @param returnDigits
* @return
* @throws GeneralSecurityException
*/
public static String generateTOTP( String key, int returnDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
long timeInMilis = currentDateTime.getTimeInMillis();
String steps = "0";
long T = ( timeInMilis - TIME_ZERO ) / TIME_SLICE_X ;
steps = Long.toHexString( T ).toUpperCase();
// Just get a 16 digit string
while(steps.length() < 16)
steps = "0" + steps;
return TimeBasedOTP.generateTOTP( key, steps, returnDigits);
}
/**
* Generate a TOTP value using HMAC_SHA256
* @param key
* @param returnDigits
* @return
* @throws GeneralSecurityException
*/
public static String generateTOTP256( String key, int returnDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
long timeInMilis = currentDateTime.getTimeInMillis();
String steps = "0";
long T = ( timeInMilis - TIME_ZERO ) / TIME_SLICE_X ;
steps = Long.toHexString( T ).toUpperCase();
// Just get a 16 digit string
while(steps.length() < 16)
steps = "0" + steps;
return TimeBasedOTP.generateTOTP256( key, steps, returnDigits);
}
/**
* Generate a TOTP value using HMAC_SHA512
* @param key
* @param returnDigits
* @return
* @throws GeneralSecurityException
*/
public static String generateTOTP512( String key, int returnDigits ) throws GeneralSecurityException
{
TimeZone utc = TimeZone.getTimeZone( "UTC" );
Calendar currentDateTime = Calendar.getInstance( utc );
long timeInMilis = currentDateTime.getTimeInMillis();
String steps = "0";
long T = ( timeInMilis - TIME_ZERO ) / TIME_SLICE_X ;
steps = Long.toHexString( T ).toUpperCase();
// Just get a 16 digit string
while(steps.length() < 16)
steps = "0" + steps;
return TimeBasedOTP.generateTOTP512( key, steps, returnDigits);
}
/**
* This method generates an TOTP value for the given
* set of parameters.
*
* @param key the shared secret, HEX encoded
* @param time a value that reflects a time
* @param returnDigits number of digits to return
*
* @return A numeric String in base 10 that includes
* {@link truncationDigits} digits
* @throws GeneralSecurityException
*/
public static String generateTOTP( String key, String time, int returnDigits ) throws GeneralSecurityException
{
return generateTOTP( key, time, returnDigits, HMAC_SHA1 );
}
/**
* This method generates an TOTP value for the given
* set of parameters.
*
* @param key the shared secret, HEX encoded
* @param time a value that reflects a time
* @param returnDigits number of digits to return
*
* @return A numeric String in base 10 that includes
* {@link truncationDigits} digits
* @throws GeneralSecurityException
*/
public static String generateTOTP256(String key, String time, int returnDigits) throws GeneralSecurityException
{
return generateTOTP( key, time, returnDigits, HMAC_SHA256 );
}
/**
* This method generates an TOTP value for the given
* set of parameters.
*
* @param key the shared secret, HEX encoded
* @param time a value that reflects a time
* @param returnDigits number of digits to return
*
* @return A numeric String in base 10 that includes
* {@link truncationDigits} digits
* @throws GeneralSecurityException
*/
public static String generateTOTP512(String key, String time, int returnDigits) throws GeneralSecurityException
{
return generateTOTP( key, time, returnDigits, HMAC_SHA512 );
}
/**
* This method generates an TOTP value for the given
* set of parameters.
*
* @param key the shared secret, HEX encoded
* @param time a value that reflects a time
* @param returnDigits number of digits to return
* @param crypto the crypto function to use
*
* @return A numeric String in base 10 that includes
* {@link truncationDigits} digits
* @throws GeneralSecurityException
*/
public static String generateTOTP(String key, String time, int returnDigits, String crypto) throws GeneralSecurityException
{
String result = null;
byte[] hash;
// Using the counter
// First 8 bytes are for the movingFactor
// Complaint with base RFC 4226 (HOTP)
while(time.length() < 16 )
time = "0" + time;
// Get the HEX in a Byte[]
byte[] msg = hexStr2Bytes(time);
// Adding one byte to get the right conversion
byte[] k = hexStr2Bytes(key);
hash = hmac_sha1(crypto, k, msg);
// put selected bytes into result int
int offset = hash[hash.length - 1] & 0xf;
int binary =
((hash[offset] & 0x7f) << 24) |
((hash[offset + 1] & 0xff) << 16) |
((hash[offset + 2] & 0xff) << 8) |
(hash[offset + 3] & 0xff);
int otp = binary % DIGITS_POWER[ returnDigits ];
result = Integer.toString(otp);
while (result.length() < returnDigits ) {
result = "0" + result;
}
return result;
}
/**
* This method uses the JCE to provide the crypto
* algorithm.
* HMAC computes a Hashed Message Authentication Code with the
* crypto hash algorithm as a parameter.
*
* @param crypto the crypto algorithm (HmacSHA1, HmacSHA256,
* HmacSHA512)
* @param keyBytes the bytes to use for the HMAC key
* @param text the message or text to be authenticated.
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
private static byte[] hmac_sha1(String crypto, byte[] keyBytes, byte[] text) throws GeneralSecurityException
{
Mac hmac;
hmac = Mac.getInstance(crypto);
SecretKeySpec macKey =
new SecretKeySpec(keyBytes, "RAW");
hmac.init(macKey);
return hmac.doFinal(text);
}
/**
* This method converts HEX string to Byte[]
*
* @param hex the HEX string
*
* @return A byte array
*/
private static byte[] hexStr2Bytes(String hex)
{
// Adding one byte to get the right conversion
// values starting with "0" can be converted
byte[] bArray = new BigInteger("10" + hex,16).toByteArray();
// Copy all the REAL bytes, not the "first"
byte[] ret = new byte[bArray.length - 1];
for (int i = 0; i < ret.length ; i++)
ret[i] = bArray[i+1];
return ret;
}
}
