nl.sidn.dnslib.message.records.dnssec.DSResourceRecord.java Source code

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Here is the source code for nl.sidn.dnslib.message.records.dnssec.DSResourceRecord.java

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/*
 * ENTRADA, a big data platform for network data analytics
 *
 * Copyright (C) 2016 SIDN [https://www.sidn.nl]
 * 
 * This file is part of ENTRADA.
 * 
 * ENTRADA 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.
 * 
 * ENTRADA 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 ENTRADA.  If not, see [<http://www.gnu.org/licenses/].
 *
 */
package nl.sidn.dnslib.message.records.dnssec;

import java.util.Arrays;

import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;

import org.apache.commons.codec.binary.Hex;

import nl.sidn.dnslib.message.records.AbstractResourceRecord;
import nl.sidn.dnslib.message.util.NetworkData;
import nl.sidn.dnslib.types.AlgorithmType;
import nl.sidn.dnslib.types.DigestType;

public class DSResourceRecord extends AbstractResourceRecord {

    private static final long serialVersionUID = 1L;

    /*
       The RDATA for a DS RR consists of a 2 octet Key Tag field, a 1 octet
       Algorithm field, a 1 octet Digest Type field, and a Digest field.
        
                       1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           Key Tag             |  Algorithm    |  Digest Type  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       /                                                               /
       /                            Digest                             /
       /                                                               /
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     */

    private char keytag;
    private AlgorithmType algorithm;
    private DigestType digestType;
    private byte[] digest;

    private String hex;

    @Override
    public void decode(NetworkData buffer) {
        super.decode(buffer);

        keytag = buffer.readUnsignedChar();

        short alg = buffer.readUnsignedByte();
        algorithm = AlgorithmType.fromValue(alg);

        short dt = buffer.readUnsignedByte();
        digestType = DigestType.fromValue(dt);

        digest = new byte[rdLength - 4];
        buffer.readBytes(digest);

        hex = new String(Hex.encodeHex(digest));
    }

    @Override
    public void encode(NetworkData buffer) {

        super.encode(buffer);

        buffer.writeChar(rdLength);

        buffer.writeChar(keytag);

        buffer.writeByte(algorithm.getValue());

        buffer.writeByte(digestType.getValue());

        buffer.writeBytes(digest);

    }

    @Override
    public String toString() {
        return "DSResourceRecord [rdLength=" + (int) rdLength + ", keytag=" + (int) keytag + ", algorithm="
                + algorithm + ", digestType=" + digestType + ", digest=" + Arrays.toString(digest) + "]";
    }

    @Override
    public JsonObject toJSon() {
        JsonObjectBuilder builder = super.createJsonBuilder();
        return builder.add("rdata",
                Json.createObjectBuilder().add("keytag", (int) keytag)
                        .add("algorithm", algorithm != null ? algorithm.name() : "")
                        .add("digest-type", digestType.name()).add("digest", hex))
                .build();
    }

    public char getKeytag() {
        return keytag;
    }

    public void setKeytag(char keytag) {
        this.keytag = keytag;
    }

    public AlgorithmType getAlgorithm() {
        return algorithm;
    }

    public void setAlgorithm(AlgorithmType algorithm) {
        this.algorithm = algorithm;
    }

    public DigestType getDigestType() {
        return digestType;
    }

    public void setDigestType(DigestType digestType) {
        this.digestType = digestType;
    }

    public byte[] getDigest() {
        return digest;
    }

    public void setDigest(byte[] digest) {
        this.digest = digest;
    }

    public String getReadableHash() {
        return hex;
    }

    public void setReadableHash(String hex) {
        this.hex = hex;
    }

}