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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 java.util.ArrayList;
import java.util.List;

import javax.security.auth.callback.CallbackHandler;

import org.apache.ws.security.SOAPConstants;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSEncryptionPart;
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.message.WSSecUsernameToken;
import org.apache.ws.security.message.WSSecSignature;
import org.apache.ws.security.util.WSSecurityUtil;
import org.w3c.dom.Document;

/**
 * Sign a request using a secret key derived from UsernameToken data.
 * 
 * Enhanced by Alberto Coletti to support digest password type for 
 * username token signature
 * 
 * @author Werner Dittmann ([email protected])
 */

public class UsernameTokenSignedAction implements Action {
    public void execute(WSHandler handler, int actionToDo, Document doc, RequestData reqData)
            throws WSSecurityException {
        CallbackHandler callbackHandler = 
            handler.getPasswordCallbackHandler(reqData);
        WSPasswordCallback passwordCallback = 
            handler.getPasswordCB(reqData.getUsername(), actionToDo, callbackHandler, reqData);

        WSSecUsernameToken builder = new WSSecUsernameToken(reqData.getWssConfig());
        
        if (reqData.isUseDerivedKey()) {
            int iterations = reqData.getDerivedKeyIterations();
            boolean useMac = reqData.isUseDerivedKeyForMAC();
            builder.addDerivedKey(useMac, null, iterations);
        } else {
            builder.setPasswordType(reqData.getPwType());  // enhancement by Alberto Coletti
            builder.setSecretKeyLength(reqData.getSecretKeyLength());
        }
        
        builder.setUserInfo(reqData.getUsername(), passwordCallback.getPassword());
        builder.addCreated();
        builder.addNonce();
        builder.prepare(doc);

        // Now prepare to sign.
        // First step:  Get a WS Signature object and set config parameters
        // second step: set user data and algorithm parameters. This
        //              _must_ be done before we "prepare"
        // third step:  Call "prepare". This creates the internal WS Signature
        //              data structures, XML element, fills in the algorithms
        //              and other data.
        // fourth step: Get the references. These references identify the parts
        //              of the document that will be included into the 
        //              signature. If no references are given sign the message
        //              body by default.
        // fifth step:  compute the signature
        //
        // after "prepare" the Signature XML element is ready and may prepend
        // this to the security header.
        
        WSSecSignature sign = new WSSecSignature(reqData.getWssConfig());
        sign.setCustomTokenValueType(WSConstants.USERNAMETOKEN_NS + "#UsernameToken");
        sign.setCustomTokenId(builder.getId());
        sign.setSecretKey(builder.getSecretKey());
        sign.setKeyIdentifierType(WSConstants.CUSTOM_SYMM_SIGNING);
        if (reqData.getSigDigestAlgorithm() != null) {
            sign.setDigestAlgo(reqData.getSigDigestAlgorithm());
        }
        
        if (reqData.getSigAlgorithm() != null) {
            sign.setSignatureAlgorithm(reqData.getSigAlgorithm());
        } else {
            sign.setSignatureAlgorithm(WSConstants.HMAC_SHA1);
        }

        sign.prepare(doc, null, reqData.getSecHeader());

        // prepend in this order: first the Signature Element and then the
        // UsernameToken Element. This way the server gets the UsernameToken
        // first, can check it and are prepared to compute the Signature key.  
        // sign.prependToHeader(reqData.getSecHeader());
        // builder.prependToHeader(reqData.getSecHeader());

        List parts = null;
        if (reqData.getSignatureParts().size() > 0) {
            parts = reqData.getSignatureParts();
        } else {
            SOAPConstants soapConstants = reqData.getSoapConstants();
            if (soapConstants == null) {
                soapConstants = WSSecurityUtil.getSOAPConstants(doc.getDocumentElement());
            }
            parts = new ArrayList();
            WSEncryptionPart encP = 
                new WSEncryptionPart(WSConstants.ELEM_BODY, soapConstants.getEnvelopeURI(), "Content");
            parts.add(encP);
        }
        List referenceList = 
            sign.addReferencesToSign(parts, reqData.getSecHeader());

        try {
            sign.computeSignature(referenceList);
            reqData.getSignatureValues().add(sign.getSignatureValue());
        } catch (WSSecurityException e) {
            throw new WSSecurityException(
                "WSHandler: Error during UsernameTokenSignature", e
            );
        }
        builder.prependToHeader(reqData.getSecHeader());
    }
}