/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code 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 in the LICENSE file that

 * accompanied this code).

 *

 * 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.

 *

 */

package sun.security.mscapi;

/**

 * The handle for an RSA or DSA key using the Microsoft Crypto API.

 *

 * @see DSAPrivateKey

 * @see RSAPrivateKey

 * @see RSAPublicKey

 *

 * @since 1.6

 * @author  Stanley Man-Kit Ho

 */

abstract class Key implements java.security.Key

{

    // Native handle

    protected long hCryptProv = 0;

    protected long hCryptKey = 0;

    // Key length

    protected int keyLength = 0;

    /**

     * Construct a Key object.

     */

    protected Key(long hCryptProv, long hCryptKey, int keyLength)

    {

        this.hCryptProv = hCryptProv;

        this.hCryptKey = hCryptKey;

        this.keyLength = keyLength;

    }

    /**

     * Finalization method

     */

    protected void finalize() throws Throwable

    {

        try {

            synchronized(this)

            {

                cleanUp(hCryptProv, hCryptKey);

                hCryptProv = 0;

                hCryptKey = 0;

            }

        } finally {

            super.finalize();

        }

    }

    /**

     * Native method to cleanup the key handle.

     */

    private native static void cleanUp(long hCryptProv, long hCryptKey);

    /**

     * Return bit length of the key.

     */

    public int bitLength()

    {

        return keyLength;

    }

    /**

     * Return native HCRYPTKEY handle.

     */

    public long getHCryptKey()

    {

        return hCryptKey;

    }

    /**

     * Return native HCRYPTPROV handle.

     */

    public long getHCryptProvider()

    {

        return hCryptProv;

    }

    /**

     * Returns the standard algorithm name for this key. For

     * example, "DSA" would indicate that this key is a DSA key.

     * See Appendix A in the <a href=

     * "../../../guide/security/CryptoSpec.html#AppA">

     * Java Cryptography Architecture API Specification &amp; Reference </a>

     * for information about standard algorithm names.

     *

     * @return the name of the algorithm associated with this key.

     */

    public abstract String getAlgorithm();

    /**

     * Returns the name of the primary encoding format of this key,

     * or null if this key does not support encoding.

     * The primary encoding format is

     * named in terms of the appropriate ASN.1 data format, if an

     * ASN.1 specification for this key exists.

     * For example, the name of the ASN.1 data format for public

     * keys is <I>SubjectPublicKeyInfo</I>, as

     * defined by the X.509 standard; in this case, the returned format is

     * <code>"X.509"</code>. Similarly,

     * the name of the ASN.1 data format for private keys is

     * <I>PrivateKeyInfo</I>,

     * as defined by the PKCS #8 standard; in this case, the returned format is

     * <code>"PKCS#8"</code>.

     *

     * @return the primary encoding format of the key.

     */

    public String getFormat()

    {

        return null;

    }

    /**

     * Returns the key in its primary encoding format, or null

     * if this key does not support encoding.

     *

     * @return the encoded key, or null if the key does not support

     * encoding.

     */

    public byte[] getEncoded()

    {

        return null;

    }

    protected native static String getContainerName(long hCryptProv);

    protected native static String getKeyType(long hCryptKey);

}