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/* * Copyright (c) 2000, 2001, 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.security.auth.x500; import java.security.PrivateKey;import java.security.cert.X509Certificate;import javax.security.auth.Destroyable; /** * <p> This class represents an <code>X500PrivateCredential</code>. * It associates an X.509 certificate, corresponding private key and the * KeyStore alias used to reference that exact key pair in the KeyStore. * This enables looking up the private credentials for an X.500 principal * in a subject. * */public final class X500PrivateCredential implements Destroyable {    private X509Certificate cert;    private PrivateKey key;    private String alias;     /**     * Creates an X500PrivateCredential that associates an X.509 certificate,     * a private key and the KeyStore alias.     * <p>     * @param cert X509Certificate     * @param key  PrivateKey for the certificate     * @exception IllegalArgumentException if either <code>cert</code> or     * <code>key</code> is null     *     */     public X500PrivateCredential(X509Certificate cert, PrivateKey key) {        if (cert == null || key == null )            throw new IllegalArgumentException();        this.cert = cert;        this.key = key;        this.alias=null;    }     /**     * Creates an X500PrivateCredential that associates an X.509 certificate,     * a private key and the KeyStore alias.     * <p>     * @param cert X509Certificate     * @param key  PrivateKey for the certificate     * @param alias KeyStore alias     * @exception IllegalArgumentException if either <code>cert</code>,     * <code>key</code> or <code>alias</code> is null     *     */    public X500PrivateCredential(X509Certificate cert, PrivateKey key,                                 String alias) {        if (cert == null || key == null|| alias == null )            throw new IllegalArgumentException();        this.cert = cert;        this.key = key;        this.alias=alias;    }     /**     * Returns the X.509 certificate.     * <p>     * @return the X509Certificate     */     public X509Certificate getCertificate() {        return cert;    }     /**     * Returns the PrivateKey.     * <p>     * @return the PrivateKey     */    public PrivateKey getPrivateKey() {        return key;    }     /**     * Returns the KeyStore alias.     * <p>     * @return the KeyStore alias     */     public String getAlias() {        return alias;    }     /**     * Clears the references to the X.509 certificate, private key and the     * KeyStore alias in this object.     */     public void destroy() {        cert = null;        key = null;        alias =null;    }     /**     * Determines if the references to the X.509 certificate and private key     * in this object have been cleared.     * <p>     * @return true if X509Certificate and the PrivateKey are null      */    public boolean isDestroyed() {        return cert == null && key == null && alias==null;    }}