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PKCS#11 wrapper based on sunpkcs11
// Copyright (c) 2002 Graz University of Technology. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. The end-user documentation included with the redistribution, if any, must
// include the following acknowledgment:
//
// "This product includes software developed by IAIK of Graz University of
// Technology."
//
// Alternately, this acknowledgment may appear in the software itself, if and
// wherever such third-party acknowledgments normally appear.
//
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
// Technology" must not be used to endorse or promote products derived from
// this software without prior written permission.
//
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
// nor may "IAIK" appear in their name, without prior written permission of
// Graz University of Technology.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// POSSIBILITY OF SUCH DAMAGE.
package iaik.pkcs.pkcs11;
import iaik.pkcs.pkcs11.wrapper.PKCS11Constants;
import sun.security.pkcs11.wrapper.PKCS11Exception;
/**
* This class offers a default-implementation of a MutexHandler.
*
* @author Karl Scheibelhofer
* @version 1.0
*/
public class DefaultMutexHandler implements MutexHandler {
/**
* A simple mutex implementation, but it satisfies the requirements stated
* in PKCS#11 v2.11.
*
*/
private static class Mutex {
/**
* Indicates that this mutex is currently locked.
*/
protected boolean locked;
/**
* Default constructor.
*/
public Mutex() {
locked = false;
}
/**
* Locks this mutex. Waits until the mutex gets unlocked, if
* it is already locked.
*
* @exception InterruptedException
* If the current thread has been interrupted.
*/
public synchronized void lock() throws InterruptedException {
if (Thread.interrupted()) {
throw new InterruptedException();
}
try {
while (locked) {
wait();
}
locked = true;
} catch (InterruptedException ex) {
notify();
throw ex;
}
}
/**
* Unlocks this mutex. It returns the previous lock-state.
*
* @return True, if the mutex was locked. False, otherwise.
*/
public synchronized boolean unlock() {
boolean previousState = locked;
locked = false;
notify();
return previousState;
}
/**
* Returns the string representation of this object.
*
* @return the string representation of this object
*/
public String toString() {
return ((locked) ? "locked" : "unlocked");
}
}
/**
* Create a new mutex object.
*
* @return The new mutex object.
* @exception PKCS11Exception
* If the wrapper should return a different value than CKR_OK
* to the library. It gets the error-code and returns it as
* CK_RV.
*/
@Override
public Object createMutex() throws PKCS11Exception {
return new Mutex();
}
/**
* Destroy a mutex object.
*
* @param mutex
* The mutex object to destroy.
* @exception PKCS11Exception
* If the wrapper should return a different value than CKR_OK
* to the library. It gets the error-code and returns it as
* CK_RV.
*/
@Override
public void destroyMutex(Object mutex) throws PKCS11Exception {
// trust in the garbage collector
}
/**
* If this method is called on with a mutex object which is not locked, the
* calling thread obtains a lock on that mutex object and returns.
* If this method is called with a mutex object which is locked by some
* thread other than the calling thread, the calling thread blocks and waits
* for that mutex to be unlocked.
* If this method is called with a a mutex object which is locked by the
* calling thread, the behavior of this method call is undefined.
*
* @param mutex
* The mutex object to lock.
* @exception PKCS11Exception
* If the wrapper should return a different value than CKR_OK
* to the library. It gets the error-code and returns it as
* CK_RV.
*/
@Override
public void lockMutex(Object mutex) throws PKCS11Exception {
try {
Mutex castedMutex = (Mutex) mutex;
while (true) {
try {
castedMutex.lock();
break;
} catch (InterruptedException ex) {
// try again, until we succeed
}
}
} catch (ClassCastException ex) {
throw new PKCS11Exception(PKCS11Constants.CKR_MUTEX_BAD);
}
}
/**
* If this method is called with a mutex object which is locked by the
* calling thread, that mutex object is unlocked and the function call
* returns. Furthermore: If exactly one thread was blocking on that
* particular mutex object, then that thread stops blocking, obtains a lock
* on that mutex object, and its lockMutex(PKCS11Object) call returns.
* If more than one thread was blocking on that particular mutex object,
* then exactly one of the blocking threads is selected somehow. That lucky
* thread stops blocking, obtains a lock on the mutex object, and its
* lockMutex(PKCS11Object) call returns. All other threads blocking on that
* particular mutex object continue to block.
* If this method is called with a mutex object which is not locked, then
* the method call throws an exception with the error code
* PKCS11Constants.CKR_mutex_NOT_LOCKED.
* If this method is called with a mutex object which is locked by some
* thread other than the calling thread, the behavior of this method call is
* undefined.
*
* @param mutex
* The mutex object to unlock.
* @exception PKCS11Exception
* If the wrapper should return a different value than CKR_OK
* to the library. It gets the error-code and returns it as
* CK_RV.
*/
@Override
public void unlockMutex(Object mutex) throws PKCS11Exception {
try {
Mutex castedMutex = (Mutex) mutex;
castedMutex.unlock();
} catch (ClassCastException ex) {
throw new PKCS11Exception(PKCS11Constants.CKR_MUTEX_BAD);
}
}
}