/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/**

 * 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 com.sun.org.apache.xml.internal.security.keys.content.keyvalues;

import java.math.BigInteger;

import java.security.Key;

import java.security.KeyFactory;

import java.security.NoSuchAlgorithmException;

import java.security.PublicKey;

import java.security.interfaces.DSAParams;

import java.security.interfaces.DSAPublicKey;

import java.security.spec.DSAPublicKeySpec;

import java.security.spec.InvalidKeySpecException;

import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;

import com.sun.org.apache.xml.internal.security.utils.Constants;

import com.sun.org.apache.xml.internal.security.utils.I18n;

import com.sun.org.apache.xml.internal.security.utils.SignatureElementProxy;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

public class DSAKeyValue extends SignatureElementProxy implements KeyValueContent {

    /**

     * Constructor DSAKeyValue

     *

     * @param element

     * @param baseURI

     * @throws XMLSecurityException

     */

    public DSAKeyValue(Element element, String baseURI) throws XMLSecurityException {

        super(element, baseURI);

    }

    /**

     * Constructor DSAKeyValue

     *

     * @param doc

     * @param P

     * @param Q

     * @param G

     * @param Y

     */

    public DSAKeyValue(Document doc, BigInteger P, BigInteger Q, BigInteger G, BigInteger Y) {

        super(doc);

        addReturnToSelf();

        this.addBigIntegerElement(P, Constants._TAG_P);

        this.addBigIntegerElement(Q, Constants._TAG_Q);

        this.addBigIntegerElement(G, Constants._TAG_G);

        this.addBigIntegerElement(Y, Constants._TAG_Y);

    }

    /**

     * Constructor DSAKeyValue

     *

     * @param doc

     * @param key

     * @throws IllegalArgumentException

     */

    public DSAKeyValue(Document doc, Key key) throws IllegalArgumentException {

        super(doc);

        addReturnToSelf();

        if (key instanceof DSAPublicKey) {

            DSAParams params = ((DSAPublicKey) key).getParams();

            this.addBigIntegerElement(params.getP(), Constants._TAG_P);

            this.addBigIntegerElement(params.getQ(), Constants._TAG_Q);

            this.addBigIntegerElement(params.getG(), Constants._TAG_G);

            this.addBigIntegerElement(((DSAPublicKey) key).getY(), Constants._TAG_Y);

        } else {

            Object exArgs[] = { Constants._TAG_DSAKEYVALUE, key.getClass().getName() };

            throw new IllegalArgumentException(I18n.translate("KeyValue.IllegalArgument", exArgs));

        }

    }

    /** {@inheritDoc} */

    public PublicKey getPublicKey() throws XMLSecurityException {

        try {

            DSAPublicKeySpec pkspec =

                new DSAPublicKeySpec(

                    this.getBigIntegerFromChildElement(

                        Constants._TAG_Y, Constants.SignatureSpecNS

                    ),

                    this.getBigIntegerFromChildElement(

                        Constants._TAG_P, Constants.SignatureSpecNS

                    ),

                    this.getBigIntegerFromChildElement(

                        Constants._TAG_Q, Constants.SignatureSpecNS

                    ),

                    this.getBigIntegerFromChildElement(

                        Constants._TAG_G, Constants.SignatureSpecNS

                    )

                );

            KeyFactory dsaFactory = KeyFactory.getInstance("DSA");

            PublicKey pk = dsaFactory.generatePublic(pkspec);

            return pk;

        } catch (NoSuchAlgorithmException ex) {

            throw new XMLSecurityException(ex);

        } catch (InvalidKeySpecException ex) {

            throw new XMLSecurityException(ex);

        }

    }

    /** {@inheritDoc} */

    public String getBaseLocalName() {

        return Constants._TAG_DSAKEYVALUE;

    }

}