/*
 * [SignAndEncrypt.java]
 *
 * Summary: Digitally sign a message, then encrypt it.
 *
 * Copyright: (c) 2004-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.4 2006-03-05 reformat with IntelliJ and add Javadoc.
 */
package com.mindprod.transporter;

import java.io.IOException;
import java.io.Serializable;

/**
 * Digitally sign a message, then encrypt it.
 * <p/>
 * Using compression, and base64u  armouring.
 * <p/>
 * See Transporter.java for example of use.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.4 2006-03-05 reformat with IntelliJ and add Javadoc.
 * @since 2004-06-08
 */
public final class SignAndEncrypt extends Wrap
    {
    /**
     * helper for signing
     */
    protected final Sign signer;

    /**
     * helper for encrypting
     */
    private final Encrypt encrypter;

    /**
     * constructor.
     *
     * @param senderPrivateKey  sender's private key
     * @param receiverPublicKey receiver's public key
     */
    public SignAndEncrypt( PrivateKey senderPrivateKey,
                           PublicKey receiverPublicKey )
        {
        super();
        signer = new Sign( senderPrivateKey );
        encrypter = new Encrypt( receiverPublicKey );
        }

    /**
     * The whole enchilada. Wraps object for sending via CIA Post, serialised, compressed, signed, encrypted and base64u
     * armoured. Does not build parm=value.
     *
     * @param o Object to wrap for sending.
     *
     * @return base64u-encoded string to send.
     * @throws IOException
     */
    public String wrap( Serializable o ) throws IOException
        {
        return armour( encrypter.encrypt( signer
                .sign( compress( serialize( o ) ) ) ) );
        }
    } // end SignAndEncrypt