de.tsenger.animamea.iso7816.DO87.java Source code

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Here is the source code for de.tsenger.animamea.iso7816.DO87.java

Source

/**
 *  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.iso7816;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * Data Object mit Tag 87 beeinhaltet einen Padding-Indikator gefolgt von dem Cryptogram
 * 
 * @author Tobias Senger (tobias@t-senger.de)
 *
 */
public class DO87 {

    private byte[] value_ = null;
    private byte[] data = null;
    private DERTaggedObject to = null;

    public DO87() {
    }

    public DO87(byte[] data) {
        this.data = data.clone();
        value_ = addPaddingIndicator(data);
        //System.out.println("do 87 padding indicator:");
        //System.out.println(Hex.toHexString(value_));
        to = new DERTaggedObject(false, 7, new DEROctetString(value_));
    }

    private byte[] addPaddingIndicator(byte[] data) {
        byte[] ret = new byte[data.length + 1];
        System.arraycopy(data, 0, ret, 1, data.length);
        ret[0] = 1;
        return ret;
    }

    private byte[] removePaddingIndicator(byte[] value) {
        byte[] ret = new byte[value.length - 1];
        System.arraycopy(value, 1, ret, 0, ret.length);
        return ret;
    }

    public void fromByteArray(byte[] encodedData) {
        ASN1InputStream asn1in = new ASN1InputStream(encodedData);
        try {
            to = (DERTaggedObject) asn1in.readObject();
            asn1in.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        DEROctetString ocs = (DEROctetString) to.getObject();
        value_ = ocs.getOctets();
        data = removePaddingIndicator(value_);

    }

    public byte[] getEncoded() throws IOException {
        return to.getEncoded();
    }

    public byte[] getData() {
        return data;
    }

}