de.tsenger.animamea.asn1.DynamicAuthenticationData.java Source code

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Here is the source code for de.tsenger.animamea.asn1.DynamicAuthenticationData.java

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/**
 *  Copyright 2011, Tobias Senger
 *  
 *  This file is part of animamea.
 *
 *  Animamea is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Animamea is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License   
 *  along with animamea.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.tsenger.animamea.asn1;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DERApplicationSpecific;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * De-/Kodiert die ASN1-Strukturen die fr PACE und CA (General Authenticate) bentigt
 * werden.
 * 
 * @author Tobias Senger
 * 
 */
public class DynamicAuthenticationData extends ASN1Object {

    private final List<DERTaggedObject> objects = new ArrayList<DERTaggedObject>(3);

    /**
     * Constructor for encoding
     */
    public DynamicAuthenticationData() {
    }

    /**
     * Constructor for decoding
     * @param data
     */
    public DynamicAuthenticationData(byte[] data) {

        DERApplicationSpecific das = null;
        ASN1Sequence seq = null;

        try {
            das = (DERApplicationSpecific) DERApplicationSpecific.fromByteArray(data);
            seq = ASN1Sequence.getInstance(das.getObject(BERTags.SEQUENCE));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        for (int i = 0; i < seq.size(); i++) {
            DERTaggedObject temp = (DERTaggedObject) seq.getObjectAt(i);
            objects.add(temp);
        }

    }

    /**
     * Fgt ein Tagged Object mit dem Tag (0x80 & tagno) ein.
     * @param tagno
     * @param data
     */
    public void addDataObject(int tagno, byte[] data) {
        objects.add(new DERTaggedObject(false, tagno, new DEROctetString(data)));
    }

    /**
     * Liefert den Inhalt des Tagged Objects mit dem Tag (0x80 & tagno) zurck.
     * @param tagno
     * @return
     */
    public byte[] getDataObject(int tagno) {
        for (DERTaggedObject item : objects) {
            if (item.getTagNo() == tagno) {
                DEROctetString ostr = (DEROctetString) item.getObjectParser(BERTags.OCTET_STRING, false);
                return ostr.getOctets();
            }
        }
        return null;
    }

    /* (non-Javadoc)
     * @see org.bouncycastle.asn1.ASN1Object#toASN1Primitive()
     */
    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector asn1vec = new ASN1EncodableVector();

        for (DERTaggedObject item : objects) {
            asn1vec.add(item);
        }

        return new DERApplicationSpecific(0x1C, asn1vec); // Application specific + 0x1c = 0x7C
    }
}