org.cryptoworkshop.ximix.common.asn1.message.PostedMessage.java Source code

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Here is the source code for org.cryptoworkshop.ximix.common.asn1.message.PostedMessage.java

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/**
 * Copyright 2013 Crypto Workshop Pty Ltd
 *
 * Licensed 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 org.cryptoworkshop.ximix.common.asn1.message;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;

/**
 * Carrier class for a single posted message with optional commitment.
 */
public class PostedMessage extends ASN1Object {
    private final int index;
    private final byte[] message;
    private final byte[] commitment;

    private PostedMessage(ASN1Sequence seq) {
        this.index = ASN1Integer.getInstance(seq.getObjectAt(0)).getValue().intValue();
        this.message = ASN1OctetString.getInstance(seq.getObjectAt(1)).getOctets();
        if (seq.size() == 3) {
            this.commitment = ASN1OctetString.getInstance(seq.getObjectAt(2)).getOctets();
        } else {
            this.commitment = null;
        }
    }

    /**
     * Basic constructor for a simple message.
     *
     * @param index the index number of the message.
     * @param message the message data.
     */
    public PostedMessage(int index, byte[] message) {
        this(index, message, null);
    }

    /**
     * Constructor for a message with an associated commitment.
     *
     * @param index the index number of the message.
     * @param message the message data.
     * @param commitment the commitment data.
     */
    public PostedMessage(int index, byte[] message, byte[] commitment) {
        this.index = index;
        this.message = message;
        this.commitment = commitment;
    }

    public static final PostedMessage getInstance(Object o) {
        if (o instanceof PostedMessage) {
            return (PostedMessage) o;
        } else if (o != null) {
            return new PostedMessage(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(new ASN1Integer(index));
        v.add(new DEROctetString(message));

        if (commitment != null) {
            v.add(new DEROctetString(commitment));
        }

        return new DERSequence(v);
    }

    public int getIndex() {
        return index;
    }

    public byte[] getMessage() {
        return message;
    }

    public byte[] getCommitment() {
        return commitment;
    }

    public boolean hasCommitment() {
        return commitment != null;
    }
}