/*

 * 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.

 */

/*

 * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * $Id$

 */

package org.jcp.xml.dsig.internal.dom;

import java.math.BigInteger;

import javax.xml.crypto.*;

import javax.xml.crypto.dom.DOMCryptoContext;

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

import org.w3c.dom.Node;

import org.w3c.dom.Text;

/**

 * A DOM-based representation of the XML {@code CryptoBinary} simple type

 * as defined in the W3C specification for XML-Signature Syntax and Processing.

 * The XML Schema Definition is defined as:

 *

 * <pre>{@code

 * <simpleType name="CryptoBinary">

 *   <restriction base = "base64Binary">

 *   </restriction>

 * </simpleType>

 * }</pre>

 *

 * @author Sean Mullan

 */

public final class DOMCryptoBinary extends DOMStructure {

    private final BigInteger bigNum;

    private final String value;

    /**

     * Create a {@code DOMCryptoBinary} instance from the specified

     * {@code BigInteger}

     *

     * @param bigNum the arbitrary-length integer

     * @throws NullPointerException if {@code bigNum} is {@code null}

     */

    public DOMCryptoBinary(BigInteger bigNum) {

        if (bigNum == null) {

            throw new NullPointerException("bigNum is null");

        }

        this.bigNum = bigNum;

        // convert to bitstring

        byte[] bytes = XMLUtils.getBytes(bigNum, bigNum.bitLength());

        value = XMLUtils.encodeToString(bytes);

    }

    /**

     * Creates a {@code DOMCryptoBinary} from a node.

     *

     * @param cbNode a CryptoBinary text node

     * @throws MarshalException if value cannot be decoded (invalid format)

     */

    public DOMCryptoBinary(Node cbNode) throws MarshalException {

        value = cbNode.getNodeValue();

        try {

            bigNum = new BigInteger(1, XMLUtils.decode(((Text) cbNode).getData()));

        } catch (Exception ex) {

            throw new MarshalException(ex);

        }

    }

    /**

     * Returns the {@code BigInteger} that this object contains.

     *

     * @return the {@code BigInteger} that this object contains

     */

    public BigInteger getBigNum() {

        return bigNum;

    }

    @Override

    public void marshal(Node parent, String prefix, DOMCryptoContext context)

        throws MarshalException {

        parent.appendChild

            (DOMUtils.getOwnerDocument(parent).createTextNode(value));

    }

}