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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id$
 */
package javax.xml.crypto.dsig;

import javax.xml.crypto.AlgorithmMethod;
import javax.xml.crypto.XMLStructure;
import java.security.spec.AlgorithmParameterSpec;

/**
 * A representation of the XML DigestMethod element as 
 * defined in the 
 * W3C Recommendation for XML-Signature Syntax and Processing. 
 * The XML Schema Definition is defined as:
 * 
 * 
 *   <element name="DigestMethod" type="ds:DigestMethodType"/>
 *     <complexType name="DigestMethodType" mixed="true">
 *       <sequence>
 *         <any namespace="##any" minOccurs="0" maxOccurs="unbounded"/>
 *           <!-- (0,unbounded) elements from (1,1) namespace -->
 *       </sequence>
 *       <attribute name="Algorithm" type="anyURI" use="required"/>
 *     </complexType>
 * 
 *
 * A DigestMethod instance may be created by invoking the 
 * {@link XMLSignatureFactory#newDigestMethod newDigestMethod} method 
 * of the {@link XMLSignatureFactory} class.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @see XMLSignatureFactory#newDigestMethod(String, DigestMethodParameterSpec)
 */
public interface DigestMethod extends XMLStructure, AlgorithmMethod {

    /**
     * The 
     * SHA1 digest method algorithm URI.
     */
    String SHA1 = "http://www.w3.org/2000/09/xmldsig#sha1";

    /**
     * The 
     * SHA256 digest method algorithm URI.
     */
    String SHA256 = "http://www.w3.org/2001/04/xmlenc#sha256";

    /**
     * The 
     * SHA512 digest method algorithm URI.
     */
    String SHA512 = "http://www.w3.org/2001/04/xmlenc#sha512";

    /**
     * The 
     * RIPEMD-160 digest method algorithm URI.
     */
    String RIPEMD160 = "http://www.w3.org/2001/04/xmlenc#ripemd160";

    /**
     * Returns the algorithm-specific input parameters associated with this
     * DigestMethod.
     *
     * The returned parameters can be typecast to a {@link 
     * javax.xml.crypto.dsig.spec.DigestMethodParameterSpec} object.
     *
     * @return the algorithm-specific parameters (may be null if
     *    not specified)
     */
    AlgorithmParameterSpec getParameterSpec();
}