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iText, a free Java-PDF library
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/*
 * $Id: ExternalSignatureContainer.java 5919 2013-07-29 13:07:44Z achingarev $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2013 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.text.pdf.security;

import com.itextpdf.text.pdf.PdfDictionary;
import java.io.InputStream;
import java.security.GeneralSecurityException;

/**
 * Interface to sign a document. The signing is fully done externally, including the container composition.
 * @author Paulo Soares
 */
public interface ExternalSignatureContainer {
    /**
     * Produces the container with the signature.
     * @param data the data to sign
     * @return a container with the signature and other objects, like CRL and OCSP. The container will generally be a PKCS7 one.
     * @throws GeneralSecurityException 
     */
    public byte[] sign(InputStream data) throws GeneralSecurityException;
    
    /**
     * Modifies the signature dictionary to suit the container. At least the keys PdfName.FILTER and 
     * PdfName.SUBFILTER will have to be set.
     * @param signDic the signature dictionary
     */
    public void modifySigningDictionary(PdfDictionary signDic);
}