/*

 * Copyright (c) 2005, 2014, 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.

 */

/*

 * $Id: SignedInfo.java,v 1.7 2005/05/10 16:03:47 mullan Exp $

 */

package javax.xml.crypto.dsig;

import javax.xml.crypto.XMLStructure;

import java.io.InputStream;

import java.util.List;

/**

 * An representation of the XML <code>SignedInfo</code> element as

 * defined in the <a href="http://www.w3.org/TR/xmldsig-core/">

 * W3C Recommendation for XML-Signature Syntax and Processing</a>.

 * The XML Schema Definition is defined as:

 * <pre><code>

 * <element name="SignedInfo" type="ds:SignedInfoType"/>

 * <complexType name="SignedInfoType">

 *   <sequence>

 *     <element ref="ds:CanonicalizationMethod"/>

 *     <element ref="ds:SignatureMethod"/>

 *     <element ref="ds:Reference" maxOccurs="unbounded"/>

 *   </sequence>

 *   <attribute name="Id" type="ID" use="optional"/>

 * </complexType>

 * </code></pre>

 *

 * A <code>SignedInfo</code> instance may be created by invoking one of the

 * {@link XMLSignatureFactory#newSignedInfo newSignedInfo} methods of the

 * {@link XMLSignatureFactory} class.

 *

 * @author Sean Mullan

 * @author JSR 105 Expert Group

 * @since 1.6

 * @see XMLSignatureFactory#newSignedInfo(CanonicalizationMethod, SignatureMethod, List)

 * @see XMLSignatureFactory#newSignedInfo(CanonicalizationMethod, SignatureMethod, List, String)

 */

public interface SignedInfo extends XMLStructure {

    /**

     * Returns the canonicalization method of this <code>SignedInfo</code>.

     *

     * @return the canonicalization method

     */

    CanonicalizationMethod getCanonicalizationMethod();

    /**

     * Returns the signature method of this <code>SignedInfo</code>.

     *

     * @return the signature method

     */

    SignatureMethod getSignatureMethod();

    /**

     * Returns an {@link java.util.Collections#unmodifiableList

     * unmodifiable list} of one or more {@link Reference}s.

     *

     * @return an unmodifiable list of one or more {@link Reference}s

     */

    List<Reference> getReferences();

    /**

     * Returns the optional <code>Id</code> attribute of this

     * <code>SignedInfo</code>.

     *

     * @return the id (may be <code>null</code> if not specified)

     */

    String getId();

    /**

     * Returns the canonicalized signed info bytes after a signing or

     * validation operation. This method is useful for debugging.

     *

     * @return an <code>InputStream</code> containing the canonicalized bytes,

     *    or <code>null</code> if this <code>SignedInfo</code> has not been

     *    signed or validated yet

     */

    InputStream getCanonicalizedData();

}