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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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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: DigestMethod.java 1333869 2012-05-04 10:42:44Z coheigea $
 */
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();
}