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The Apache WSS4J project provides a Java implementation of the primary security standards for Web Services, namely the OASIS Web Services Security (WS-Security) specifications from the OASIS Web Services Security TC.

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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.ws.security.action;

import org.apache.ws.security.WSPasswordCallback;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.handler.RequestData;
import org.apache.ws.security.handler.WSHandler;
import org.apache.ws.security.handler.WSHandlerConstants;
import org.apache.ws.security.message.WSSecSignature;
import org.w3c.dom.Document;

public class SignatureAction implements Action {
    public void execute(WSHandler handler, int actionToDo, Document doc, RequestData reqData)
            throws WSSecurityException {
        WSPasswordCallback pwcb =
            handler.getPassword(
                reqData.getSignatureUser(),
                actionToDo,
                WSHandlerConstants.PW_CALLBACK_CLASS,
                WSHandlerConstants.PW_CALLBACK_REF, reqData
            );

        WSSecSignature wsSign = new WSSecSignature();
        wsSign.setWsConfig(reqData.getWssConfig());

        if (reqData.getSigKeyId() != 0) {
            wsSign.setKeyIdentifierType(reqData.getSigKeyId());
        }
        if (reqData.getSigAlgorithm() != null) {
            wsSign.setSignatureAlgorithm(reqData.getSigAlgorithm());
        }
        if (reqData.getSigDigestAlgorithm() != null) {
            wsSign.setDigestAlgo(reqData.getSigDigestAlgorithm());
        }

        wsSign.setUserInfo(reqData.getSignatureUser(), pwcb.getPassword());
        wsSign.setUseSingleCertificate(reqData.isUseSingleCert());
        if (reqData.getSignatureParts().size() > 0) {
            wsSign.setParts(reqData.getSignatureParts());
        }
        
        if (pwcb.getKey() != null) {
            wsSign.setSecretKey(pwcb.getKey());
        }

        try {
            wsSign.build(doc, reqData.getSigCrypto(), reqData.getSecHeader());
            reqData.getSignatureValues().add(wsSign.getSignatureValue());
        } catch (WSSecurityException e) {
            throw new WSSecurityException("Error during Signature: ", e);
        }
    }

}