/* X500PrivateCredential.java -- certificate and private key pair.   Copyright (C) 2003, 2004  Free Software Foundation, Inc.This file is part of GNU Classpath.GNU Classpath is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, or (at your option)any later version.GNU Classpath is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA02110-1301 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception statement from your version. */package javax.security.auth.x500;import java.security.PrivateKey;import java.security.cert.X509Certificate;import javax.security.auth.Destroyable;/** * A pairing of a {@link X509Certificate} and its corresponding {@link * PrivateKey}, with an optional keystore alias. */public final class X500PrivateCredential implements Destroyable{  // Fields.  // -------------------------------------------------------------------------  private PrivateKey key;  private X509Certificate certificate;  private String alias;  // Constructors.  // -------------------------------------------------------------------------  /**   * Creates a new private credential with no associated keystore alias.   *   * @param certificate The X.509 certificate.   * @param key The private key.   * @throws IllegalArgumentException If either parameter is null.   */  public X500PrivateCredential (X509Certificate certificate, PrivateKey key)  {    if (certificate == null || key == null)      throw new IllegalArgumentException();    this.certificate = certificate;    this.key = key;  }  /**   * Creates a new private credential with a keystore alias.   *   * @param certificate The X.509 certificate.   * @param key The private key.   * @param alias The keystore alias for this credential.   * @throws IllegalArgumentException If any parameter is null.   */  public X500PrivateCredential (X509Certificate certificate, PrivateKey key,                                String alias)  {    this (certificate, key);    if (alias == null)      throw new IllegalArgumentException();    this.alias = alias;  }  // Instance methods.  // -------------------------------------------------------------------------  /**   * Returns the certificate of this credential.   *   * @return The certificate of this credential.   */  public X509Certificate getCertificate()  {    return certificate;  }  /**   * Returns the private key of this credential.   *   * @return The private key of this credential.   */  public PrivateKey getPrivateKey()  {    return key;  }  /**   * Returns the keystore alias of this credential, or null if not present.   *   * @return The keystore alias, or null.   */  public String getAlias()  {    return alias;  }  /**   * Destroy the sensitive data of this credential, setting the certificate,   * private key, and keystore alias to null.   */  public void destroy()  {    certificate = null;    key = null;    alias = null;  }  /**   * Tells whether or not this credential has been destroyed, and that   * the certificate and private key fields are null.   *   * @return True if this object has been destroyed.   */  public boolean isDestroyed()  {    return certificate == null && key == null;  }}