src/jdk.crypto.mscapi/windows/classes/sun/security/mscapi/CPrivateKey.java

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 * Copyright (c) 2005, 2024, Oracle and/or its affiliates. All rights reserved.
 * 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
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.security.mscapi;

import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.security.PrivateKey;

/**
 * The handle for a private key using the Microsoft Crypto API.
 *
 * @author Stanley Man-Kit Ho
 * @since 1.6
 */
class CPrivateKey extends CKey implements PrivateKey {

    @java.io.Serial
    private static final long serialVersionUID = 8113152807912338063L;

    private CPrivateKey(String alg, NativeHandles handles, int keyLength) {
        super(alg, handles, keyLength, false);
    }

    // Called by native code inside security.cpp
    static CPrivateKey of(
            String alg, long hCryptProv, long hCryptKey, int keyLength) {
        return of(alg, new NativeHandles(hCryptProv, hCryptKey), keyLength);
    }

    public static CPrivateKey of(String alg, NativeHandles handles, int keyLength) {
        return new CPrivateKey(alg, handles, keyLength);
    }

    // this key does not support encoding
    public String getFormat()     {
        return null;
    }

    // this key does not support encoding
    public byte[] getEncoded() {
        return null;
    }

    // This class is not serializable
    @java.io.Serial
    private void writeObject(java.io.ObjectOutputStream out)
            throws java.io.IOException {
        throw new java.io.InvalidObjectException(
                "CPrivateKeys are not serializable");
    }

    /**
     * Restores the state of this object from the stream.
     * <p>
     * Deserialization of this object is not supported.
     *
     * @param  stream the {@code ObjectInputStream} from which data is read
     * @throws IOException if an I/O error occurs
     * @throws ClassNotFoundException if a serialized class cannot be loaded
     */
    @java.io.Serial
    private void readObject(ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        throw new InvalidObjectException(
                "CPrivateKeys are not deserializable");
    }
}