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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.
 */
package org.apache.xml.security.encryption;

import java.util.Iterator;
import org.w3c.dom.Element;

/**
 * EncryptionMethod describes the encryption algorithm applied to
 * the cipher data. If the element is absent, the encryption algorithm must be
 * known by the recipient or the decryption will fail.
 * 
 * It is defined as follows:
 * 

 * <complexType name='EncryptionMethodType' mixed='true'>
 *     <sequence>
 *         <element name='KeySize' minOccurs='0' type='xenc:KeySizeType'/>
 *         <element name='OAEPparams' minOccurs='0' type='base64Binary'/>
 *         <any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
 *     </sequence>
 *     <attribute name='Algorithm' type='anyURI' use='required'/>
 * </complexType>
 * 
 *
 * @author Axl Mattheus
 */
public interface EncryptionMethod {
    /**
     * Returns the algorithm applied to the cipher data.
     *
     * @return the encryption algorithm.
     */
    String getAlgorithm();

    /**
     * Returns the key size of the key of the algorithm applied to the cipher
     * data.
     *
     * @return the key size.
     */
    int getKeySize();

    /**
     * Sets the size of the key of the algorithm applied to the cipher data.
     *
     * @param size the key size.
     */
    void setKeySize(int size);

    /**
     * Returns the OAEP parameters of the algorithm applied applied to the
     * cipher data.
     *
     * @return the OAEP parameters.
     */
    byte[] getOAEPparams();

    /**
     * Sets the OAEP parameters.
     *
     * @param parameters the OAEP parameters.
     */
    void setOAEPparams(byte[] parameters);
    
    /**
     * Set the Digest Algorithm to use
     * @param digestAlgorithm the Digest Algorithm to use
     */
    void setDigestAlgorithm(String digestAlgorithm);
    
    /**
     * Get the Digest Algorithm to use
     * @return the Digest Algorithm to use
     */
    String getDigestAlgorithm();
    
    /**
     * Set the MGF Algorithm to use
     * @param mgfAlgorithm the MGF Algorithm to use
     */
    void setMGFAlgorithm(String mgfAlgorithm);
    
    /**
     * Get the MGF Algorithm to use
     * @return the MGF Algorithm to use
     */
    String getMGFAlgorithm();

    /**
     * Returns an iterator over all the additional elements contained in the
     * EncryptionMethod.
     *
     * @return an Iterator over all the additional infomation
     *   about the EncryptionMethod.
     */
    Iterator getEncryptionMethodInformation();

    /**
     * Adds encryption method information.
     *
     * @param information additional encryption method information.
     */
    void addEncryptionMethodInformation(Element information);

    /**
     * Removes encryption method information.
     *
     * @param information the information to remove from the
     *   EncryptionMethod.
     */
    void removeEncryptionMethodInformation(Element information);
}