/*
* Portions Copyright 2000-2009 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program 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
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package gov.nist.siplite;
import gov.nist.core.*;
import java.util.Random;
import java.util.Date;
/**
* SIP utility functions.
*/
public class SIPUtils extends Utils {
/** Seed for randomizer. */
private static int counter;
/**
* Generates the branch identifiers.
*
* @return a branch identifier.
*/
public static String generateBranchId() {
String b = new Long(System.currentTimeMillis()).toString() +
new Random().nextLong();
byte bid[] = digest(b.getBytes());
// cryptographically random string.
// prepend with a magic cookie to indicate we
// are bis09 compatible.
return SIPConstants.GENERAL_BRANCH_MAGIC_COOKIE +
Utils.toHexString(bid);
}
/**
* Generates a call identifier for the stack.
* @param stackAddr current stack address
*
* @return a call id.
*/
public static String generateCallIdentifier(String stackAddr) {
String date = (new Date()).toString() +
new Random(counter++).nextLong();
byte cidbytes[] = digest(date.getBytes());
String cidString = Utils.toHexString(cidbytes);
return cidString + Separators.AT + stackAddr;
}
}