com.jingtum.core.bouncycastle.asn1.DERSequence Maven / Gradle / Ivy

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/*
 * Copyright www.jingtum.com Inc. 
 * 
 * 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.jingtum.core.bouncycastle.asn1;

import java.io.IOException;
import java.util.Enumeration;

public class DERSequence
    extends ASN1Sequence
{
    private int bodyLength = -1;

    /**
     * create an empty sequence
     */
    public DERSequence()
    {
    }

    /**
     * create a sequence containing one object
     */
    public DERSequence(
        ASN1Encodable obj)
    {
        super(obj);
    }

    /**
     * create a sequence containing a vector of objects.
     */
    public DERSequence(
        ASN1EncodableVector v)
    {
        super(v);
    }

    /**
     * create a sequence containing an array of objects.
     */
    public DERSequence(
        ASN1Encodable[]   array)
    {
        super(array);
    }

    @SuppressWarnings("rawtypes")
	private int getBodyLength()
        throws IOException
    {
        if (bodyLength < 0)
        {
            int length = 0;

            for (Enumeration e = this.getObjects(); e.hasMoreElements();)
            {
                Object    obj = e.nextElement();

                length += ((ASN1Encodable)obj).toASN1Primitive().toDERObject().encodedLength();
            }

            bodyLength = length;
        }

        return bodyLength;
    }

    int encodedLength()
        throws IOException
    {
        int length = getBodyLength();

        return 1 + StreamUtil.calculateBodyLength(length) + length;
    }

    /*
     * A note on the implementation:
     * 
     * As DER requires the constructed, definite-length model to
     * be used for structured types, this varies slightly from the
     * ASN.1 descriptions given. Rather than just outputting SEQUENCE,
     * we also have to specify CONSTRUCTED, and the objects length.
     */
    @SuppressWarnings("rawtypes")
	void encode(
        ASN1OutputStream out)
        throws IOException
    {
        ASN1OutputStream        dOut = out.getDERSubStream();
        int                     length = getBodyLength();

        out.write(BERTags.SEQUENCE | BERTags.CONSTRUCTED);
        out.writeLength(length);

        for (Enumeration e = this.getObjects(); e.hasMoreElements();)
        {
            Object    obj = e.nextElement();

            dOut.writeObject((ASN1Encodable)obj);
        }
    }
}