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DSS Document contains the code for the creation and validation of XAdES, CAdES, PAdES and ASiC signatures.

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/**
 * DSS - Digital Signature Services
 * Copyright (C) 2015 European Commission, provided under the CEF programme
 * 
 * This file is part of the "DSS - Digital Signature Services" project.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package eu.europa.esig.dss.signature;

import eu.europa.esig.dss.AbstractSignatureParameters;
import eu.europa.esig.dss.model.DSSDocument;

/**
 * Extends the level of AdES signature of a document. After level -B, going upper in the signature format level
 * consists of adding unsigned properties to the signature. It can be done without breaking the signature.
 *
 * @param  implementation of signature parameters corresponding to the supported signature format
 */
public interface SignatureExtension {

	/**
	 * Extends the level of the signatures contained in a document.
	 *
	 * @param document The signed document to be signed
	 * @param params   the parameters for the extension
	 * @return the extended document
	 */
	DSSDocument extendSignatures(DSSDocument document, SP params);

}