/*

 * Copyright (c) 1996, 2017, 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 java.security;

import java.io.*;

/**

 * This class is used to represent an Identity that can also digitally

 * sign data.

 *

 * <p>The management of a signer's private keys is an important and

 * sensitive issue that should be handled by subclasses as appropriate

 * to their intended use.

 *

 * @see Identity

 *

 * @author Benjamin Renaud

 * @since 1.1

 *

 * @deprecated This class is no longer used. Its functionality has been

 * replaced by {@code java.security.KeyStore}, the

 * {@code java.security.cert} package, and

 * {@code java.security.Principal}.

 */

@Deprecated(since="1.2")

public abstract class Signer extends Identity {

    private static final long serialVersionUID = -1763464102261361480L;

    /**

     * The signer's private key.

     *

     * @serial

     */

    private PrivateKey privateKey;

    /**

     * Creates a signer. This constructor should only be used for

     * serialization.

     */

    protected Signer() {

        super();

    }

    /**

     * Creates a signer with the specified identity name.

     *

     * @param name the identity name.

     */

    public Signer(String name) {

        super(name);

    }

    /**

     * Creates a signer with the specified identity name and scope.

     *

     * @param name the identity name.

     *

     * @param scope the scope of the identity.

     *

     * @exception KeyManagementException if there is already an identity

     * with the same name in the scope.

     */

    public Signer(String name, IdentityScope scope)

    throws KeyManagementException {

        super(name, scope);

    }

    /**

     * Returns this signer's private key.

     *

     * <p>First, if there is a security manager, its {@code checkSecurityAccess}

     * method is called with {@code "getSignerPrivateKey"}

     * as its argument to see if it's ok to return the private key.

     *

     * @return this signer's private key, or null if the private key has

     * not yet been set.

     *

     * @exception  SecurityException  if a security manager exists and its

     * {@code checkSecurityAccess} method doesn't allow

     * returning the private key.

     *

     * @see SecurityManager#checkSecurityAccess

     */

    public PrivateKey getPrivateKey() {

        check("getSignerPrivateKey");

        return privateKey;

    }

   /**

     * Sets the key pair (public key and private key) for this signer.

     *

     * <p>First, if there is a security manager, its {@code checkSecurityAccess}

     * method is called with {@code "setSignerKeyPair"}

     * as its argument to see if it's ok to set the key pair.

     *

     * @param pair an initialized key pair.

     *

     * @exception InvalidParameterException if the key pair is not

     * properly initialized.

     * @exception KeyException if the key pair cannot be set for any

     * other reason.

     * @exception  SecurityException  if a security manager exists and its

     * {@code checkSecurityAccess} method doesn't allow

     * setting the key pair.

     *

     * @see SecurityManager#checkSecurityAccess

     */

    public final void setKeyPair(KeyPair pair)

    throws InvalidParameterException, KeyException {

        check("setSignerKeyPair");

        final PublicKey pub = pair.getPublic();

        PrivateKey priv = pair.getPrivate();

        if (pub == null || priv == null) {

            throw new InvalidParameterException();

        }

        try {

            AccessController.doPrivileged(

                new PrivilegedExceptionAction<>() {

                public Void run() throws KeyManagementException {

                    setPublicKey(pub);

                    return null;

                }

            });

        } catch (PrivilegedActionException pae) {

            throw (KeyManagementException) pae.getException();

        }

        privateKey = priv;

    }

    String printKeys() {

        String keys = "";

        PublicKey publicKey = getPublicKey();

        if (publicKey != null && privateKey != null) {

            keys = "\tpublic and private keys initialized";

        } else {

            keys = "\tno keys";

        }

        return keys;

    }

    /**

     * Returns a string of information about the signer.

     *

     * @return a string of information about the signer.

     */

    public String toString() {

        return "[Signer]" + super.toString();

    }

    private static void check(String directive) {

        SecurityManager security = System.getSecurityManager();

        if (security != null) {

            security.checkSecurityAccess(directive);

        }

    }

}