Java example source code file (DSAKeyValue.java)

This example Java source code file (DSAKeyValue.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

biginteger, dom, dsakeyvalue, dsapublickeyspec, illegalargumentexception, invalidkeyspecexception, keyfactory, keyvaluecontent, math, nosuchalgorithmexception, object, publickey, security, signatureelementproxy, string, xmlsecurityexception

The DSAKeyValue.java Java example source code

/*
 * 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.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 com.sun.org.apache.xml.internal.security.utils.XMLUtils;
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);

        XMLUtils.addReturnToElement(this.constructionElement);
        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);

        XMLUtils.addReturnToElement(this.constructionElement);

        if (key instanceof java.security.interfaces.DSAPublicKey) {
            this.addBigIntegerElement(((DSAPublicKey) key).getParams().getP(), Constants._TAG_P);
            this.addBigIntegerElement(((DSAPublicKey) key).getParams().getQ(), Constants._TAG_Q);
            this.addBigIntegerElement(((DSAPublicKey) key).getParams().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("empty", ex);
        } catch (InvalidKeySpecException ex) {
            throw new XMLSecurityException("empty", ex);
        }
    }

    /** @inheritDoc */
    public String getBaseLocalName() {
        return Constants._TAG_DSAKEYVALUE;
    }
}