/*
 * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
 */

/* 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
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY  OF SUCH DAMAGE.
 */

package sun.security.pkcs11.wrapper;

import java.io.File;
import java.io.IOException;
import java.util.*;

import java.security.AccessController;
import java.security.PrivilegedAction;

import sun.security.util.Debug;

import static sun.security.pkcs11.wrapper.PKCS11Constants.*;

/**
 * This is the default implementation of the PKCS11 interface. IT connects to
 * the pkcs11wrapper.dll file, which is the native part of this library.
 * The strange and awkward looking initialization was chosen to avoid calling
 * loadLibrary from a static initialization block, because this would complicate
 * the use in applets.
 *
 * @author Karl Scheibelhofer <Karl.Scheibelhofer@iaik.at>
 * @author Martin Schlaeffer <schlaeff@sbox.tugraz.at>
 * @invariants (pkcs11ModulePath_ <> null)
 */
public class PKCS11 {

    /**
     * The name of the native part of the wrapper; i.e. the filename without
     * the extension (e.g. ".DLL" or ".so").
     */
    private static final String PKCS11_WRAPPER = "j2pkcs11";

    static {
        // cannot use LoadLibraryAction because that would make the native
        // library available to the bootclassloader, but we run in the
        // extension classloader.
        AccessController.doPrivileged(new PrivilegedAction<Object>() {
            public Object run() {
                System.loadLibrary(PKCS11_WRAPPER);
                return null;
            }
        });
        boolean enableDebug = Debug.getInstance("sunpkcs11") != null;
        initializeLibrary(enableDebug);
    }

    public static void loadNative() {
        // dummy method that can be called to make sure the native
        // portion has been loaded. actual loading happens in the
        // static initializer, hence this method is empty.
    }

    /**
     * The PKCS#11 module to connect to. This is the PKCS#11 driver of the token;
     * e.g. pk2priv.dll.
     */
    private final String pkcs11ModulePath;

    private long pNativeData;

    /**
     * This method does the initialization of the native library. It is called
     * exactly once for this class.
     *
     * @preconditions
     * @postconditions
     */
    private static native void initializeLibrary(boolean debug);

    // XXX
    /**
     * This method does the finalization of the native library. It is called
     * exactly once for this class. The library uses this method for a clean-up
     * of any resources.
     *
     * @preconditions
     * @postconditions
     */
    private static native void finalizeLibrary();

    private static final Map<String,PKCS11> moduleMap =
        new HashMap<String,PKCS11>();

    /**
     * Connects to the PKCS#11 driver given. The filename must contain the
     * path, if the driver is not in the system's search path.
     *
     * @param pkcs11ModulePath the PKCS#11 library path
     * @preconditions (pkcs11ModulePath <> null)
     * @postconditions
     */
    PKCS11(String pkcs11ModulePath, String functionListName)
            throws IOException {
        connect(pkcs11ModulePath, functionListName);
        this.pkcs11ModulePath = pkcs11ModulePath;
    }

    public static synchronized PKCS11 getInstance(String pkcs11ModulePath,
            String functionList, CK_C_INITIALIZE_ARGS pInitArgs,
            boolean omitInitialize) throws IOException, PKCS11Exception {
        // we may only call C_Initialize once per native .so/.dll
        // so keep a cache using the (non-canonicalized!) path
        PKCS11 pkcs11 = moduleMap.get(pkcs11ModulePath);
        if (pkcs11 == null) {
            if ((pInitArgs != null)
                    && ((pInitArgs.flags & CKF_OS_LOCKING_OK) != 0)) {
                pkcs11 = new PKCS11(pkcs11ModulePath, functionList);
            } else {
                pkcs11 = new SynchronizedPKCS11(pkcs11ModulePath, functionList);
            }
            if (omitInitialize == false) {
                try {
                    pkcs11.C_Initialize(pInitArgs);
                } catch (PKCS11Exception e) {
                    // ignore already-initialized error code
                    // rethrow all other errors
                    if (e.getErrorCode() != CKR_CRYPTOKI_ALREADY_INITIALIZED) {
                        throw e;
                    }
                }
            }
            moduleMap.put(pkcs11ModulePath, pkcs11);
        }
        return pkcs11;
    }

    /**
     * Connects this object to the specified PKCS#11 library. This method is for
     * internal use only.
     * Declared private, because incorrect handling may result in errors in the
     * native part.
     *
     * @param pkcs11ModulePath The PKCS#11 library path.
     * @preconditions (pkcs11ModulePath <> null)
     * @postconditions
     */
    private native void connect(String pkcs11ModulePath, String functionListName)
            throws IOException;

    /**
     * Disconnects the PKCS#11 library from this object. After calling this
     * method, this object is no longer connected to a native PKCS#11 module
     * and any subsequent calls to C_ methods will fail. This method is for
     * internal use only.
     * Declared private, because incorrect handling may result in errors in the
     * native part.
     *
     * @preconditions
     * @postconditions
     */
    private native void disconnect();


    // Implementation of PKCS11 methods delegated to native pkcs11wrapper library

/* *****************************************************************************
 * General-purpose
 ******************************************************************************/

    /**
     * C_Initialize initializes the Cryptoki library.
     * (General-purpose)
     *
     * @param pInitArgs if pInitArgs is not NULL it gets casted to
     *         CK_C_INITIALIZE_ARGS_PTR and dereferenced
     *         (PKCS#11 param: CK_VOID_PTR pInitArgs)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    native void C_Initialize(Object pInitArgs) throws PKCS11Exception;

    /**
     * C_Finalize indicates that an application is done with the
     * Cryptoki library
     * (General-purpose)
     *
     * @param pReserved is reserved. Should be NULL_PTR
     *         (PKCS#11 param: CK_VOID_PTR pReserved)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pReserved == null)
     * @postconditions
     */
    public native void C_Finalize(Object pReserved) throws PKCS11Exception;


    /**
     * C_GetInfo returns general information about Cryptoki.
     * (General-purpose)
     *
     * @return the information.
     *         (PKCS#11 param: CK_INFO_PTR pInfo)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native CK_INFO C_GetInfo() throws PKCS11Exception;


/* *****************************************************************************
 * Slot and token management
 ******************************************************************************/

    /**
     * C_GetSlotList obtains a list of slots in the system.
     * (Slot and token management)
     *
     * @param tokenPresent if true only Slot IDs with a token are returned
     *         (PKCS#11 param: CK_BBOOL tokenPresent)
     * @return a long array of slot IDs and number of Slot IDs
     *         (PKCS#11 param: CK_SLOT_ID_PTR pSlotList, CK_ULONG_PTR pulCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native long[] C_GetSlotList(boolean tokenPresent)
            throws PKCS11Exception;


    /**
     * C_GetSlotInfo obtains information about a particular slot in
     * the system.
     * (Slot and token management)
     *
     * @param slotID the ID of the slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @return the slot information
     *         (PKCS#11 param: CK_SLOT_INFO_PTR pInfo)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native CK_SLOT_INFO C_GetSlotInfo(long slotID) throws PKCS11Exception;


    /**
     * C_GetTokenInfo obtains information about a particular token
     * in the system.
     * (Slot and token management)
     *
     * @param slotID ID of the token's slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @return the token information
     *         (PKCS#11 param: CK_TOKEN_INFO_PTR pInfo)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native CK_TOKEN_INFO C_GetTokenInfo(long slotID)
            throws PKCS11Exception;


    /**
     * C_GetMechanismList obtains a list of mechanism types
     * supported by a token.
     * (Slot and token management)
     *
     * @param slotID ID of the token's slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @return a long array of mechanism types and number of mechanism types
     *         (PKCS#11 param: CK_MECHANISM_TYPE_PTR pMechanismList,
     *                         CK_ULONG_PTR pulCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native long[] C_GetMechanismList(long slotID) throws PKCS11Exception;


    /**
     * C_GetMechanismInfo obtains information about a particular
     * mechanism possibly supported by a token.
     * (Slot and token management)
     *
     * @param slotID ID of the token's slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @param type type of mechanism
     *         (PKCS#11 param: CK_MECHANISM_TYPE type)
     * @return the mechanism info
     *         (PKCS#11 param: CK_MECHANISM_INFO_PTR pInfo)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native CK_MECHANISM_INFO C_GetMechanismInfo(long slotID, long type)
            throws PKCS11Exception;


    /**
     * C_InitToken initializes a token.
     * (Slot and token management)
     *
     * @param slotID ID of the token's slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @param pPin the SO's initial PIN and the length in bytes of the PIN
     *         (PKCS#11 param: CK_CHAR_PTR pPin, CK_ULONG ulPinLen)
     * @param pLabel 32-byte token label (blank padded)
     *         (PKCS#11 param: CK_UTF8CHAR_PTR pLabel)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_InitToken(long slotID, char[] pPin, char[] pLabel)
//            throws PKCS11Exception;


    /**
     * C_InitPIN initializes the normal user's PIN.
     * (Slot and token management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPin the normal user's PIN and the length in bytes of the PIN
     *         (PKCS#11 param: CK_CHAR_PTR pPin, CK_ULONG ulPinLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_InitPIN(long hSession, char[] pPin)
//            throws PKCS11Exception;


    /**
     * C_SetPIN modifies the PIN of the user who is logged in.
     * (Slot and token management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pOldPin the old PIN and the length of the old PIN
     *         (PKCS#11 param: CK_CHAR_PTR pOldPin, CK_ULONG ulOldLen)
     * @param pNewPin the new PIN and the length of the new PIN
     *         (PKCS#11 param: CK_CHAR_PTR pNewPin, CK_ULONG ulNewLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_SetPIN(long hSession, char[] pOldPin, char[] pNewPin)
//            throws PKCS11Exception;


/* *****************************************************************************
 * Session management
 ******************************************************************************/

    /**
     * C_OpenSession opens a session between an application and a
     * token.
     * (Session management)
     *
     * @param slotID the slot's ID
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @param flags of CK_SESSION_INFO
     *         (PKCS#11 param: CK_FLAGS flags)
     * @param pApplication passed to callback
     *         (PKCS#11 param: CK_VOID_PTR pApplication)
     * @param Notify the callback function
     *         (PKCS#11 param: CK_NOTIFY Notify)
     * @return the session handle
     *         (PKCS#11 param: CK_SESSION_HANDLE_PTR phSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native long C_OpenSession(long slotID, long flags,
            Object pApplication, CK_NOTIFY Notify) throws PKCS11Exception;


    /**
     * C_CloseSession closes a session between an application and a
     * token.
     * (Session management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_CloseSession(long hSession) throws PKCS11Exception;


    /**
     * C_CloseAllSessions closes all sessions with a token.
     * (Session management)
     *
     * @param slotID the ID of the token's slot
     *         (PKCS#11 param: CK_SLOT_ID slotID)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_CloseAllSessions(long slotID) throws PKCS11Exception;


    /**
     * C_GetSessionInfo obtains information about the session.
     * (Session management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the session info
     *         (PKCS#11 param: CK_SESSION_INFO_PTR pInfo)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native CK_SESSION_INFO C_GetSessionInfo(long hSession)
            throws PKCS11Exception;


    /**
     * C_GetOperationState obtains the state of the cryptographic operation
     * in a session.
     * (Session management)
     *
     * @param hSession session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the state and the state length
     *         (PKCS#11 param: CK_BYTE_PTR pOperationState,
     *                         CK_ULONG_PTR pulOperationStateLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native byte[] C_GetOperationState(long hSession)
            throws PKCS11Exception;


    /**
     * C_SetOperationState restores the state of the cryptographic
     * operation in a session.
     * (Session management)
     *
     * @param hSession session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pOperationState the state and the state length
     *         (PKCS#11 param: CK_BYTE_PTR pOperationState,
     *                         CK_ULONG ulOperationStateLen)
     * @param hEncryptionKey en/decryption key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hEncryptionKey)
     * @param hAuthenticationKey sign/verify key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hAuthenticationKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_SetOperationState(long hSession, byte[] pOperationState,
            long hEncryptionKey, long hAuthenticationKey) throws PKCS11Exception;


    /**
     * C_Login logs a user into a token.
     * (Session management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param userType the user type
     *         (PKCS#11 param: CK_USER_TYPE userType)
     * @param pPin the user's PIN and the length of the PIN
     *         (PKCS#11 param: CK_CHAR_PTR pPin, CK_ULONG ulPinLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_Login(long hSession, long userType, char[] pPin)
            throws PKCS11Exception;


    /**
     * C_Logout logs a user out from a token.
     * (Session management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_Logout(long hSession) throws PKCS11Exception;


/* *****************************************************************************
 * Object management
 ******************************************************************************/

    /**
     * C_CreateObject creates a new object.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pTemplate the object's template and number of attributes in
     *         template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @return the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phObject)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native long C_CreateObject(long hSession, CK_ATTRIBUTE[] pTemplate)
            throws PKCS11Exception;


    /**
     * C_CopyObject copies an object, creating a new object for the
     * copy.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hObject the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE hObject)
     * @param pTemplate the template for the new object and number of attributes
     *         in template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @return the handle of the copy
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phNewObject)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native long C_CopyObject(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception;


    /**
     * C_DestroyObject destroys an object.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hObject the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE hObject)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_DestroyObject(long hSession, long hObject)
            throws PKCS11Exception;


    /**
     * C_GetObjectSize gets the size of an object in bytes.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hObject the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE hObject)
     * @return the size of the object
     *         (PKCS#11 param: CK_ULONG_PTR pulSize)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native long C_GetObjectSize(long hSession, long hObject)
//            throws PKCS11Exception;


    /**
     * C_GetAttributeValue obtains the value of one or more object
     * attributes. The template attributes also receive the values.
     * (Object management)
     * note: in PKCS#11 pTemplate and the result template are the same
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hObject the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE hObject)
     * @param pTemplate specifies the attributes and number of attributes to get
     *                  The template attributes also receive the values.
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pTemplate <> null)
     * @postconditions (result <> null)
     */
    public native void C_GetAttributeValue(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception;


    /**
     * C_SetAttributeValue modifies the value of one or more object
     * attributes
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hObject the object's handle
     *         (PKCS#11 param: CK_OBJECT_HANDLE hObject)
     * @param pTemplate specifies the attributes and values to get; number of
     *         attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pTemplate <> null)
     * @postconditions
     */
    public native void C_SetAttributeValue(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception;


    /**
     * C_FindObjectsInit initializes a search for token and session
     * objects that match a template.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pTemplate the object's attribute values to match and the number of
     *         attributes in search template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_FindObjectsInit(long hSession, CK_ATTRIBUTE[] pTemplate)
            throws PKCS11Exception;


    /**
     * C_FindObjects continues a search for token and session
     * objects that match a template, obtaining additional object
     * handles.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param ulMaxObjectCount the max. object handles to get
     *         (PKCS#11 param: CK_ULONG ulMaxObjectCount)
     * @return the object's handles and the actual number of objects returned
     *         (PKCS#11 param: CK_ULONG_PTR pulObjectCount)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native long[] C_FindObjects(long hSession, long ulMaxObjectCount)
            throws PKCS11Exception;


    /**
     * C_FindObjectsFinal finishes a search for token and session
     * objects.
     * (Object management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_FindObjectsFinal(long hSession) throws PKCS11Exception;


/* *****************************************************************************
 * Encryption and decryption
 ******************************************************************************/

    /**
     * C_EncryptInit initializes an encryption operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the encryption mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the encryption key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_EncryptInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception;


    /**
     * C_Encrypt encrypts single-part data.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pData the data to get encrypted and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG ulDataLen)
     * @return the encrypted data and the encrypted data's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedData,
     *                         CK_ULONG_PTR pulEncryptedDataLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pData <> null)
     * @postconditions (result <> null)
     */
    public native int C_Encrypt(long hSession, byte[] in, int inOfs, int inLen,
            byte[] out, int outOfs, int outLen) throws PKCS11Exception;


    /**
     * C_EncryptUpdate continues a multiple-part encryption
     * operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the data part to get encrypted and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @return the encrypted data part and the encrypted data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
                             CK_ULONG_PTR pulEncryptedPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
    public native int C_EncryptUpdate(long hSession, long directIn, byte[] in,
            int inOfs, int inLen, long directOut, byte[] out, int outOfs,
            int outLen) throws PKCS11Exception;


    /**
     * C_EncryptFinal finishes a multiple-part encryption
     * operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the last encrypted data part and the last data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pLastEncryptedPart,
                             CK_ULONG_PTR pulLastEncryptedPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native int C_EncryptFinal(long hSession, long directOut, byte[] out,
            int outOfs, int outLen) throws PKCS11Exception;


    /**
     * C_DecryptInit initializes a decryption operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the decryption mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the decryption key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_DecryptInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception;


    /**
     * C_Decrypt decrypts encrypted data in a single part.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pEncryptedData the encrypted data to get decrypted and the
     *         encrypted data's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedData,
     *                         CK_ULONG ulEncryptedDataLen)
     * @return the decrypted data and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG_PTR pulDataLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pEncryptedPart <> null)
     * @postconditions (result <> null)
     */
    public native int C_Decrypt(long hSession, byte[] in, int inOfs, int inLen,
            byte[] out, int outOfs, int outLen) throws PKCS11Exception;


    /**
     * C_DecryptUpdate continues a multiple-part decryption
     * operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pEncryptedPart the encrypted data part to get decrypted and the
     *         encrypted data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
     *                         CK_ULONG ulEncryptedPartLen)
     * @return the decrypted data part and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG_PTR pulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pEncryptedPart <> null)
     * @postconditions
     */
    public native int C_DecryptUpdate(long hSession, long directIn, byte[] in,
            int inOfs, int inLen, long directOut, byte[] out, int outOfs,
            int outLen) throws PKCS11Exception;


    /**
     * C_DecryptFinal finishes a multiple-part decryption
     * operation.
     * (Encryption and decryption)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the last decrypted data part and the last data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pLastPart,
     *                         CK_ULONG_PTR pulLastPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native int C_DecryptFinal(long hSession, long directOut, byte[] out,
            int outOfs, int outLen) throws PKCS11Exception;


/* *****************************************************************************
 * Message digesting
 ******************************************************************************/

    /**
     * C_DigestInit initializes a message-digesting operation.
     * (Message digesting)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the digesting mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_DigestInit(long hSession, CK_MECHANISM pMechanism)
            throws PKCS11Exception;


    // note that C_DigestSingle does not exist in PKCS#11
    // we combined the C_DigestInit and C_Digest into a single function
    // to save on Java<->C transitions and save 5-10% on small digests
    // this made the C_Digest method redundant, it has been removed
    /**
     * C_Digest digests data in a single part.
     * (Message digesting)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param data the data to get digested and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG ulDataLen)
     * @return the message digest and the length of the message digest
     *         (PKCS#11 param: CK_BYTE_PTR pDigest, CK_ULONG_PTR pulDigestLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (data <> null)
     * @postconditions (result <> null)
     */
    public native int C_DigestSingle(long hSession, CK_MECHANISM pMechanism,
            byte[] in, int inOfs, int inLen, byte[] digest, int digestOfs,
            int digestLen) throws PKCS11Exception;


    /**
     * C_DigestUpdate continues a multiple-part message-digesting
     * operation.
     * (Message digesting)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the data to get digested and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
    public native void C_DigestUpdate(long hSession, long directIn, byte[] in,
            int inOfs, int inLen) throws PKCS11Exception;


    /**
     * C_DigestKey continues a multi-part message-digesting
     * operation, by digesting the value of a secret key as part of
     * the data already digested.
     * (Message digesting)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param hKey the handle of the secret key to be digested
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_DigestKey(long hSession, long hKey)
            throws PKCS11Exception;


    /**
     * C_DigestFinal finishes a multiple-part message-digesting
     * operation.
     * (Message digesting)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the message digest and the length of the message digest
     *         (PKCS#11 param: CK_BYTE_PTR pDigest, CK_ULONG_PTR pulDigestLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native int C_DigestFinal(long hSession, byte[] pDigest, int digestOfs,
            int digestLen) throws PKCS11Exception;


/* *****************************************************************************
 * Signing and MACing
 ******************************************************************************/

    /**
     * C_SignInit initializes a signature (private key encryption)
     * operation, where the signature is (will be) an appendix to
     * the data, and plaintext cannot be recovered from the
     * signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the signature mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the signature key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_SignInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception;


    /**
     * C_Sign signs (encrypts with private key) data in a single
     * part, where the signature is (will be) an appendix to the
     * data, and plaintext cannot be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pData the data to sign and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG ulDataLen)
     * @return the signature and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature,
     *                         CK_ULONG_PTR pulSignatureLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pData <> null)
     * @postconditions (result <> null)
     */
    public native byte[] C_Sign(long hSession, byte[] pData)
            throws PKCS11Exception;


    /**
     * C_SignUpdate continues a multiple-part signature operation,
     * where the signature is (will be) an appendix to the data,
     * and plaintext cannot be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the data part to sign and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
    public native void C_SignUpdate(long hSession, long directIn, byte[] in,
            int inOfs, int inLen) throws PKCS11Exception;


    /**
     * C_SignFinal finishes a multiple-part signature operation,
     * returning the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @return the signature and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature,
     *                         CK_ULONG_PTR pulSignatureLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native byte[] C_SignFinal(long hSession, int expectedLen)
            throws PKCS11Exception;


    /**
     * C_SignRecoverInit initializes a signature operation, where
     * the data can be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the signature mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the signature key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_SignRecoverInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception;


    /**
     * C_SignRecover signs data in a single operation, where the
     * data can be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pData the data to sign and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG ulDataLen)
     * @return the signature and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature,
     *                         CK_ULONG_PTR pulSignatureLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pData <> null)
     * @postconditions (result <> null)
     */
    public native int C_SignRecover(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOufs, int outLen)
            throws PKCS11Exception;


/* *****************************************************************************
 * Verifying signatures and MACs
 ******************************************************************************/

    /**
     * C_VerifyInit initializes a verification operation, where the
     * signature is an appendix to the data, and plaintext cannot
     * cannot be recovered from the signature (e.g. DSA).
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the verification mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the verification key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_VerifyInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception;


    /**
     * C_Verify verifies a signature in a single-part operation,
     * where the signature is an appendix to the data, and plaintext
     * cannot be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pData the signed data and the signed data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG ulDataLen)
     * @param pSignature the signature to verify and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature, CK_ULONG ulSignatureLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pData <> null) and (pSignature <> null)
     * @postconditions
     */
    public native void C_Verify(long hSession, byte[] pData, byte[] pSignature)
            throws PKCS11Exception;


    /**
     * C_VerifyUpdate continues a multiple-part verification
     * operation, where the signature is an appendix to the data,
     * and plaintext cannot be recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the signed data part and the signed data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
    public native void C_VerifyUpdate(long hSession, long directIn, byte[] in,
            int inOfs, int inLen) throws PKCS11Exception;


    /**
     * C_VerifyFinal finishes a multiple-part verification
     * operation, checking the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pSignature the signature to verify and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature, CK_ULONG ulSignatureLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pSignature <> null)
     * @postconditions
     */
    public native void C_VerifyFinal(long hSession, byte[] pSignature)
            throws PKCS11Exception;


    /**
     * C_VerifyRecoverInit initializes a signature verification
     * operation, where the data is recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the verification mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hKey the handle of the verification key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native void C_VerifyRecoverInit(long hSession,
            CK_MECHANISM pMechanism, long hKey) throws PKCS11Exception;


    /**
     * C_VerifyRecover verifies a signature in a single-part
     * operation, where the data is recovered from the signature.
     * (Signing and MACing)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pSignature the signature to verify and the signature's length
     *         (PKCS#11 param: CK_BYTE_PTR pSignature, CK_ULONG ulSignatureLen)
     * @return the recovered data and the recovered data's length
     *         (PKCS#11 param: CK_BYTE_PTR pData, CK_ULONG_PTR pulDataLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pSignature <> null)
     * @postconditions (result <> null)
     */
    public native int C_VerifyRecover(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOufs, int outLen)
            throws PKCS11Exception;


/* *****************************************************************************
 * Dual-function cryptographic operations
 ******************************************************************************/

    /**
     * C_DigestEncryptUpdate continues a multiple-part digesting
     * and encryption operation.
     * (Dual-function cryptographic operations)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the data part to digest and to encrypt and the data's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @return the digested and encrypted data part and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
     *                         CK_ULONG_PTR pulEncryptedPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
//    public native byte[] C_DigestEncryptUpdate(long hSession, byte[] pPart)
//            throws PKCS11Exception;


    /**
     * C_DecryptDigestUpdate continues a multiple-part decryption and
     * digesting operation.
     * (Dual-function cryptographic operations)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pEncryptedPart the encrypted data part to decrypt and to digest
     *         and encrypted data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
     *                         CK_ULONG ulEncryptedPartLen)
     * @return the decrypted and digested data part and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG_PTR pulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pEncryptedPart <> null)
     * @postconditions
     */
//    public native byte[] C_DecryptDigestUpdate(long hSession,
//            byte[] pEncryptedPart) throws PKCS11Exception;


    /**
     * C_SignEncryptUpdate continues a multiple-part signing and
     * encryption operation.
     * (Dual-function cryptographic operations)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pPart the data part to sign and to encrypt and the data part's
     *         length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG ulPartLen)
     * @return the signed and encrypted data part and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
     *                         CK_ULONG_PTR pulEncryptedPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pPart <> null)
     * @postconditions
     */
//    public native byte[] C_SignEncryptUpdate(long hSession, byte[] pPart)
//            throws PKCS11Exception;


    /**
     * C_DecryptVerifyUpdate continues a multiple-part decryption and
     * verify operation.
     * (Dual-function cryptographic operations)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pEncryptedPart the encrypted data part to decrypt and to verify
     *         and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pEncryptedPart,
     *                         CK_ULONG ulEncryptedPartLen)
     * @return the decrypted and verified data part and the data part's length
     *         (PKCS#11 param: CK_BYTE_PTR pPart, CK_ULONG_PTR pulPartLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pEncryptedPart <> null)
     * @postconditions
     */
//    public native byte[] C_DecryptVerifyUpdate(long hSession,
//            byte[] pEncryptedPart) throws PKCS11Exception;


/* *****************************************************************************
 * Key management
 ******************************************************************************/

    /**
     * C_GenerateKey generates a secret key, creating a new key
     * object.
     * (Key management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the key generation mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param pTemplate the template for the new key and the number of
     *         attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @return the handle of the new key
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native long C_GenerateKey(long hSession, CK_MECHANISM pMechanism,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception;


    /**
     * C_GenerateKeyPair generates a public-key/private-key pair,
     * creating new key objects.
     * (Key management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the key generation mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param pPublicKeyTemplate the template for the new public key and the
     *         number of attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pPublicKeyTemplate,
     *                         CK_ULONG ulPublicKeyAttributeCount)
     * @param pPrivateKeyTemplate the template for the new private key and the
     *         number of attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pPrivateKeyTemplate
     *                         CK_ULONG ulPrivateKeyAttributeCount)
     * @return a long array with exactly two elements and the public key handle
     *         as the first element and the private key handle as the second
     *         element
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phPublicKey,
     *                         CK_OBJECT_HANDLE_PTR phPrivateKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pMechanism <> null)
     * @postconditions (result <> null) and (result.length == 2)
     */
    public native long[] C_GenerateKeyPair(long hSession,
            CK_MECHANISM pMechanism, CK_ATTRIBUTE[] pPublicKeyTemplate,
            CK_ATTRIBUTE[] pPrivateKeyTemplate) throws PKCS11Exception;


    /**
     * C_WrapKey wraps (i.e., encrypts) a key.
     * (Key management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the wrapping mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hWrappingKey the handle of the wrapping key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hWrappingKey)
     * @param hKey the handle of the key to be wrapped
     *         (PKCS#11 param: CK_OBJECT_HANDLE hKey)
     * @return the wrapped key and the length of the wrapped key
     *         (PKCS#11 param: CK_BYTE_PTR pWrappedKey,
     *                         CK_ULONG_PTR pulWrappedKeyLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions (result <> null)
     */
    public native byte[] C_WrapKey(long hSession, CK_MECHANISM pMechanism,
            long hWrappingKey, long hKey) throws PKCS11Exception;


    /**
     * C_UnwrapKey unwraps (decrypts) a wrapped key, creating a new
     * key object.
     * (Key management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the unwrapping mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hUnwrappingKey the handle of the unwrapping key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hUnwrappingKey)
     * @param pWrappedKey the wrapped key to unwrap and the wrapped key's length
     *         (PKCS#11 param: CK_BYTE_PTR pWrappedKey, CK_ULONG ulWrappedKeyLen)
     * @param pTemplate the template for the new key and the number of
     *         attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @return the handle of the unwrapped key
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pWrappedKey <> null)
     * @postconditions
     */
    public native long C_UnwrapKey(long hSession, CK_MECHANISM pMechanism,
            long hUnwrappingKey, byte[] pWrappedKey, CK_ATTRIBUTE[] pTemplate)
            throws PKCS11Exception;


    /**
     * C_DeriveKey derives a key from a base key, creating a new key
     * object.
     * (Key management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pMechanism the key derivation mechanism
     *         (PKCS#11 param: CK_MECHANISM_PTR pMechanism)
     * @param hBaseKey the handle of the base key
     *         (PKCS#11 param: CK_OBJECT_HANDLE hBaseKey)
     * @param pTemplate the template for the new key and the number of
     *         attributes in the template
     *         (PKCS#11 param: CK_ATTRIBUTE_PTR pTemplate, CK_ULONG ulCount)
     * @return the handle of the derived key
     *         (PKCS#11 param: CK_OBJECT_HANDLE_PTR phKey)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
    public native long C_DeriveKey(long hSession, CK_MECHANISM pMechanism,
            long hBaseKey, CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception;


/* *****************************************************************************
 * Random number generation
 ******************************************************************************/

    /**
     * C_SeedRandom mixes additional seed material into the token's
     * random number generator.
     * (Random number generation)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param pSeed the seed material and the seed material's length
     *         (PKCS#11 param: CK_BYTE_PTR pSeed, CK_ULONG ulSeedLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pSeed <> null)
     * @postconditions
     */
    public native void C_SeedRandom(long hSession, byte[] pSeed)
            throws PKCS11Exception;


    /**
     * C_GenerateRandom generates random data.
     * (Random number generation)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @param RandomData receives the random data and the length of RandomData
     *         is the length of random data to be generated
     *         (PKCS#11 param: CK_BYTE_PTR pRandomData, CK_ULONG ulRandomLen)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (randomData <> null)
     * @postconditions
     */
    public native void C_GenerateRandom(long hSession, byte[] randomData)
            throws PKCS11Exception;


/* *****************************************************************************
 * Parallel function management
 ******************************************************************************/

    /**
     * C_GetFunctionStatus is a legacy function; it obtains an
     * updated status of a function running in parallel with an
     * application.
     * (Parallel function management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_GetFunctionStatus(long hSession)
//            throws PKCS11Exception;


    /**
     * C_CancelFunction is a legacy function; it cancels a function
     * running in parallel.
     * (Parallel function management)
     *
     * @param hSession the session's handle
     *         (PKCS#11 param: CK_SESSION_HANDLE hSession)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions
     * @postconditions
     */
//    public native void C_CancelFunction(long hSession) throws PKCS11Exception;


/* *****************************************************************************
 * Functions added in for Cryptoki Version 2.01 or later
 ******************************************************************************/

    /**
     * C_WaitForSlotEvent waits for a slot event (token insertion,
     * removal, etc.) to occur.
     * (General-purpose)
     *
     * @param flags blocking/nonblocking flag
     *         (PKCS#11 param: CK_FLAGS flags)
     * @param pReserved reserved. Should be null
     *         (PKCS#11 param: CK_VOID_PTR pReserved)
     * @return the slot ID where the event occurred
     *         (PKCS#11 param: CK_SLOT_ID_PTR pSlot)
     * @exception PKCS11Exception If function returns other value than CKR_OK.
     * @preconditions (pRserved == null)
     * @postconditions
     */
//    public native long C_WaitForSlotEvent(long flags, Object pRserved)
//            throws PKCS11Exception;

    /**
     * Returns the string representation of this object.
     *
     * @return The string representation of object
     */
    public String toString() {
        return "Module name: " + pkcs11ModulePath;
    }

    /**
     * Calls disconnect() to cleanup the native part of the wrapper. Once this
     * method is called, this object cannot be used any longer. Any subsequent
     * call to a C_* method will result in a runtime exception.
     *
     * @exception Throwable If finalization fails.
     */
    protected void finalize() throws Throwable {
        disconnect();
    }

// PKCS11 subclass that has all methods synchronized and delegating to the
// parent. Used for tokens that only support single threaded access
static class SynchronizedPKCS11 extends PKCS11 {

    SynchronizedPKCS11(String pkcs11ModulePath, String functionListName)
            throws IOException {
        super(pkcs11ModulePath, functionListName);
    }

    synchronized void C_Initialize(Object pInitArgs) throws PKCS11Exception {
        super.C_Initialize(pInitArgs);
    }

    public synchronized void C_Finalize(Object pReserved)
            throws PKCS11Exception {
        super.C_Finalize(pReserved);
    }

    public synchronized CK_INFO C_GetInfo() throws PKCS11Exception {
        return super.C_GetInfo();
    }

    public synchronized long[] C_GetSlotList(boolean tokenPresent)
            throws PKCS11Exception {
        return super.C_GetSlotList(tokenPresent);
    }

    public synchronized CK_SLOT_INFO C_GetSlotInfo(long slotID)
            throws PKCS11Exception {
        return super.C_GetSlotInfo(slotID);
    }

    public synchronized CK_TOKEN_INFO C_GetTokenInfo(long slotID)
            throws PKCS11Exception {
        return super.C_GetTokenInfo(slotID);
    }

    public synchronized long[] C_GetMechanismList(long slotID)
            throws PKCS11Exception {
        return super.C_GetMechanismList(slotID);
    }

    public synchronized CK_MECHANISM_INFO C_GetMechanismInfo(long slotID,
            long type) throws PKCS11Exception {
        return super.C_GetMechanismInfo(slotID, type);
    }

    public synchronized long C_OpenSession(long slotID, long flags,
            Object pApplication, CK_NOTIFY Notify) throws PKCS11Exception {
        return super.C_OpenSession(slotID, flags, pApplication, Notify);
    }

    public synchronized void C_CloseSession(long hSession)
            throws PKCS11Exception {
        super.C_CloseSession(hSession);
    }

    public synchronized CK_SESSION_INFO C_GetSessionInfo(long hSession)
            throws PKCS11Exception {
        return super.C_GetSessionInfo(hSession);
    }

    public synchronized void C_Login(long hSession, long userType, char[] pPin)
            throws PKCS11Exception {
        super.C_Login(hSession, userType, pPin);
    }

    public synchronized void C_Logout(long hSession) throws PKCS11Exception {
        super.C_Logout(hSession);
    }

    public synchronized long C_CreateObject(long hSession,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        return super.C_CreateObject(hSession, pTemplate);
    }

    public synchronized long C_CopyObject(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        return super.C_CopyObject(hSession, hObject, pTemplate);
    }

    public synchronized void C_DestroyObject(long hSession, long hObject)
            throws PKCS11Exception {
        super.C_DestroyObject(hSession, hObject);
    }

    public synchronized void C_GetAttributeValue(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        super.C_GetAttributeValue(hSession, hObject, pTemplate);
    }

    public synchronized void C_SetAttributeValue(long hSession, long hObject,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        super.C_SetAttributeValue(hSession, hObject, pTemplate);
    }

    public synchronized void C_FindObjectsInit(long hSession,
            CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        super.C_FindObjectsInit(hSession, pTemplate);
    }

    public synchronized long[] C_FindObjects(long hSession,
            long ulMaxObjectCount) throws PKCS11Exception {
        return super.C_FindObjects(hSession, ulMaxObjectCount);
    }

    public synchronized void C_FindObjectsFinal(long hSession)
            throws PKCS11Exception {
        super.C_FindObjectsFinal(hSession);
    }

    public synchronized void C_EncryptInit(long hSession,
            CK_MECHANISM pMechanism, long hKey) throws PKCS11Exception {
        super.C_EncryptInit(hSession, pMechanism, hKey);
    }

    public synchronized int C_Encrypt(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOfs, int outLen)
            throws PKCS11Exception {
        return super.C_Encrypt(hSession, in, inOfs, inLen, out, outOfs, outLen);
    }

    public synchronized int C_EncryptUpdate(long hSession, long directIn,
            byte[] in, int inOfs, int inLen, long directOut, byte[] out,
            int outOfs, int outLen) throws PKCS11Exception {
        return super.C_EncryptUpdate(hSession, directIn, in, inOfs, inLen,
                directOut, out, outOfs, outLen);
    }

    public synchronized int C_EncryptFinal(long hSession, long directOut,
            byte[] out, int outOfs, int outLen) throws PKCS11Exception {
        return super.C_EncryptFinal(hSession, directOut, out, outOfs, outLen);
    }

    public synchronized void C_DecryptInit(long hSession,
            CK_MECHANISM pMechanism, long hKey) throws PKCS11Exception {
        super.C_DecryptInit(hSession, pMechanism, hKey);
    }

    public synchronized int C_Decrypt(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOfs, int outLen)
            throws PKCS11Exception {
        return super.C_Decrypt(hSession, in, inOfs, inLen, out, outOfs, outLen);
    }

    public synchronized int C_DecryptUpdate(long hSession, long directIn,
            byte[] in, int inOfs, int inLen, long directOut, byte[] out,
            int outOfs, int outLen) throws PKCS11Exception {
        return super.C_DecryptUpdate(hSession, directIn, in, inOfs, inLen,
                directOut, out, outOfs, outLen);
    }

    public synchronized int C_DecryptFinal(long hSession, long directOut,
            byte[] out, int outOfs, int outLen) throws PKCS11Exception {
        return super.C_DecryptFinal(hSession, directOut, out, outOfs, outLen);
    }

    public synchronized void C_DigestInit(long hSession, CK_MECHANISM pMechanism)
            throws PKCS11Exception {
        super.C_DigestInit(hSession, pMechanism);
    }

    public synchronized int C_DigestSingle(long hSession,
            CK_MECHANISM pMechanism, byte[] in, int inOfs, int inLen,
            byte[] digest, int digestOfs, int digestLen) throws PKCS11Exception {
        return super.C_DigestSingle(hSession, pMechanism, in, inOfs, inLen,
                digest, digestOfs, digestLen);
    }

    public synchronized void C_DigestUpdate(long hSession, long directIn,
            byte[] in, int inOfs, int inLen) throws PKCS11Exception {
        super.C_DigestUpdate(hSession, directIn, in, inOfs, inLen);
    }

    public synchronized void C_DigestKey(long hSession, long hKey)
            throws PKCS11Exception {
        super.C_DigestKey(hSession, hKey);
    }

    public synchronized int C_DigestFinal(long hSession, byte[] pDigest,
            int digestOfs, int digestLen) throws PKCS11Exception {
        return super.C_DigestFinal(hSession, pDigest, digestOfs, digestLen);
    }

    public synchronized void C_SignInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception {
        super.C_SignInit(hSession, pMechanism, hKey);
    }

    public synchronized byte[] C_Sign(long hSession, byte[] pData)
            throws PKCS11Exception {
        return super.C_Sign(hSession, pData);
    }

    public synchronized void C_SignUpdate(long hSession, long directIn,
            byte[] in, int inOfs, int inLen) throws PKCS11Exception {
        super.C_SignUpdate(hSession, directIn, in, inOfs, inLen);
    }

    public synchronized byte[] C_SignFinal(long hSession, int expectedLen)
            throws PKCS11Exception {
        return super.C_SignFinal(hSession, expectedLen);
    }

    public synchronized void C_SignRecoverInit(long hSession,
            CK_MECHANISM pMechanism, long hKey) throws PKCS11Exception {
        super.C_SignRecoverInit(hSession, pMechanism, hKey);
    }

    public synchronized int C_SignRecover(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOufs, int outLen)
            throws PKCS11Exception {
        return super.C_SignRecover(hSession, in, inOfs, inLen, out, outOufs,
                outLen);
    }

    public synchronized void C_VerifyInit(long hSession, CK_MECHANISM pMechanism,
            long hKey) throws PKCS11Exception {
        super.C_VerifyInit(hSession, pMechanism, hKey);
    }

    public synchronized void C_Verify(long hSession, byte[] pData,
            byte[] pSignature) throws PKCS11Exception {
        super.C_Verify(hSession, pData, pSignature);
    }

    public synchronized void C_VerifyUpdate(long hSession, long directIn,
            byte[] in, int inOfs, int inLen) throws PKCS11Exception {
        super.C_VerifyUpdate(hSession, directIn, in, inOfs, inLen);
    }

    public synchronized void C_VerifyFinal(long hSession, byte[] pSignature)
            throws PKCS11Exception {
        super.C_VerifyFinal(hSession, pSignature);
    }

    public synchronized void C_VerifyRecoverInit(long hSession,
            CK_MECHANISM pMechanism, long hKey) throws PKCS11Exception {
        super.C_VerifyRecoverInit(hSession, pMechanism, hKey);
    }

    public synchronized int C_VerifyRecover(long hSession, byte[] in, int inOfs,
            int inLen, byte[] out, int outOufs, int outLen)
            throws PKCS11Exception {
        return super.C_VerifyRecover(hSession, in, inOfs, inLen, out, outOufs,
                outLen);
    }

    public synchronized long C_GenerateKey(long hSession,
            CK_MECHANISM pMechanism, CK_ATTRIBUTE[] pTemplate)
            throws PKCS11Exception {
        return super.C_GenerateKey(hSession, pMechanism, pTemplate);
    }

    public synchronized long[] C_GenerateKeyPair(long hSession,
            CK_MECHANISM pMechanism, CK_ATTRIBUTE[] pPublicKeyTemplate,
            CK_ATTRIBUTE[] pPrivateKeyTemplate)
            throws PKCS11Exception {
        return super.C_GenerateKeyPair(hSession, pMechanism, pPublicKeyTemplate,
                pPrivateKeyTemplate);
    }

    public synchronized byte[] C_WrapKey(long hSession, CK_MECHANISM pMechanism,
            long hWrappingKey, long hKey) throws PKCS11Exception {
        return super.C_WrapKey(hSession, pMechanism, hWrappingKey, hKey);
    }

    public synchronized long C_UnwrapKey(long hSession, CK_MECHANISM pMechanism,
            long hUnwrappingKey, byte[] pWrappedKey, CK_ATTRIBUTE[] pTemplate)
            throws PKCS11Exception {
        return super.C_UnwrapKey(hSession, pMechanism, hUnwrappingKey,
                pWrappedKey, pTemplate);
    }

    public synchronized long C_DeriveKey(long hSession, CK_MECHANISM pMechanism,
    long hBaseKey, CK_ATTRIBUTE[] pTemplate) throws PKCS11Exception {
        return super.C_DeriveKey(hSession, pMechanism, hBaseKey, pTemplate);
    }

    public synchronized void C_SeedRandom(long hSession, byte[] pSeed)
            throws PKCS11Exception {
        super.C_SeedRandom(hSession, pSeed);
    }

    public synchronized void C_GenerateRandom(long hSession, byte[] randomData)
            throws PKCS11Exception {
        super.C_GenerateRandom(hSession, randomData);
    }
}
}