io.aos.crypto.spl05.MyStructure.java Source code

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Here is the source code for io.aos.crypto.spl05.MyStructure.java

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/****************************************************************
 * Licensed to the AOS Community (AOS) under one or more        *
 * contributor license agreements.  See the NOTICE file         *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The AOS 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.                                           *
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package io.aos.crypto.spl05;

import java.util.Date;

import org.bouncycastle.asn1.*;

/**
 * Implementation of an example ASN.1 structure.
 * <pre>
 * MyStructure ::= SEQUENCE {
 *                   version INTEGER DEFAULT 0,
 *                   created GeneralizedTime,
 *                   baseData OCTET STRING,
 *                   extraData [0] UTF8String OPTIONAL,
 *                   commentData [1] UTF8String OPTIONAL }
 * <pre>
 * 
 */
public class MyStructure extends ASN1Encodable {
    private DERInteger version;
    private DERGeneralizedTime created;
    private ASN1OctetString baseData;
    private DERUTF8String extraData = null;
    private DERUTF8String commentData = null;

    /**
     * Constructor from an ASN.1 SEQUENCE
     */
    public MyStructure(ASN1Sequence seq) {
        int index = 0;

        // check for version field
        if (seq.getObjectAt(0) instanceof DERInteger) {
            this.version = (DERInteger) seq.getObjectAt(0);
            index++;
        } else {
            this.version = new DERInteger(0);
        }

        this.created = (DERGeneralizedTime) seq.getObjectAt(index++);
        this.baseData = (ASN1OctetString) seq.getObjectAt(index++);

        // check for optional fields
        for (int i = index; i != seq.size(); i++) {
            ASN1TaggedObject t = (ASN1TaggedObject) seq.getObjectAt(i);

            switch (t.getTagNo()) {
            case 0:
                extraData = DERUTF8String.getInstance(t, false);
                break;
            case 1:
                commentData = DERUTF8String.getInstance(t, false);
                break;
            default:
                throw new IllegalArgumentException("Unknown tag " + t.getTagNo() + " in constructor");
            }
        }
    }

    /**
     * Constructor from corresponding Java objects and primitives.
     */
    public MyStructure(int version, Date created, byte[] baseData, String extraData, String commentData) {
        this.version = new DERInteger(version);
        this.created = new DERGeneralizedTime(created);
        this.baseData = new DEROctetString(baseData);

        if (extraData != null) {
            this.extraData = new DERUTF8String(extraData);
        }

        if (commentData != null) {
            this.commentData = new DERUTF8String(commentData);
        }
    }

    /* 
     * Produce an object suitable for writing to an ASN1/DEROutputStream
     */
    public DERObject toASN1Object() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (version.getValue().intValue() != 0) {
            v.add(version);
        }

        v.add(created);
        v.add(baseData);

        if (extraData != null) {
            v.add(new DERTaggedObject(false, 0, extraData));
        }

        if (commentData != null) {
            v.add(new DERTaggedObject(false, 1, commentData));
        }

        return new DERSequence(v);
    }
}