/*

 * Copyright (c) 2005, 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

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 */

/*

 * $Id: SignatureMethod.java,v 1.5 2005/05/10 16:03:46 mullan Exp $

 */

package javax.xml.crypto.dsig;

import javax.xml.crypto.AlgorithmMethod;

import javax.xml.crypto.XMLStructure;

import javax.xml.crypto.dsig.spec.SignatureMethodParameterSpec;

import java.security.spec.AlgorithmParameterSpec;

/**

 * A representation of the XML <code>SignatureMethod</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:

 * <p>

 * <pre>

 *   <element name="SignatureMethod" type="ds:SignatureMethodType"/>

 *     <complexType name="SignatureMethodType" mixed="true">

 *       <sequence>

 *         <element name="HMACOutputLength" minOccurs="0" type="ds:HMACOutputLengthType"/>

 *         <any namespace="##any" minOccurs="0" maxOccurs="unbounded"/>

 *           <!-- (0,unbounded) elements from (1,1) namespace -->

 *       </sequence>

 *       <attribute name="Algorithm" type="anyURI" use="required"/>

 *     </complexType>

 * </pre>

 *

 * A <code>SignatureMethod</code> instance may be created by invoking the

 * {@link XMLSignatureFactory#newSignatureMethod newSignatureMethod} method

 * of the {@link XMLSignatureFactory} class.

 *

 * @author Sean Mullan

 * @author JSR 105 Expert Group

 * @since 1.6

 * @see XMLSignatureFactory#newSignatureMethod(String, SignatureMethodParameterSpec)

 */

public interface SignatureMethod extends XMLStructure, AlgorithmMethod {

    // All methods can be found in RFC 6931.

    /**

     * The <a href="http://www.w3.org/2000/09/xmldsig#dsa-sha1">DSA-SHA1</a>

     * (DSS) signature method algorithm URI.

     */

    String DSA_SHA1 =

        "http://www.w3.org/2000/09/xmldsig#dsa-sha1";

    /**

     * The <a href="http://www.w3.org/2000/09/xmldsig#rsa-sha1">RSA-SHA1</a>

     * (PKCS #1) signature method algorithm URI.

     */

    String RSA_SHA1 =

        "http://www.w3.org/2000/09/xmldsig#rsa-sha1";

    /**

     * The <a href="http://www.w3.org/2000/09/xmldsig#hmac-sha1">HMAC-SHA1</a>

     * MAC signature method algorithm URI

     */

    String HMAC_SHA1 =

        "http://www.w3.org/2000/09/xmldsig#hmac-sha1";

    /**

     * Returns the algorithm-specific input parameters of this

     * <code>SignatureMethod</code>.

     *

     * <p>The returned parameters can be typecast to a {@link

     * SignatureMethodParameterSpec} object.

     *

     * @return the algorithm-specific input parameters of this

     *    <code>SignatureMethod</code> (may be <code>null</code> if not

     *    specified)

     */

    AlgorithmParameterSpec getParameterSpec();

}