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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2002-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS;
import java.io.IOException;
import org.xbill.DNS.utils.base16;
/**
* DS - contains a Delegation Signer record, which acts as a placeholder for KEY records in the
* parent zone.
*
* @see DNSSEC
* @author David Blacka
* @author Brian Wellington
* @see <a href="https://datatracker.ietf.org/doc/html/rfc4034">RFC 4034: Resource Records for the
* DNS Security Extensions</a>
*/
public class DSRecord extends Record {
/**
* DS digest constants.
*
* @deprecated use {@link DNSSEC.Digest}
*/
@Deprecated
public static class Digest {
private Digest() {}
/** SHA-1 */
public static final int SHA1 = DNSSEC.Digest.SHA1;
/** SHA-256 */
public static final int SHA256 = DNSSEC.Digest.SHA256;
/** GOST R 34.11-94 */
public static final int GOST3411 = DNSSEC.Digest.GOST3411;
/** SHA-384 */
public static final int SHA384 = DNSSEC.Digest.SHA384;
}
/**
* SHA1 delegation signer digest ID.
*
* @deprecated use {@link DNSSEC.Digest#SHA1}
*/
@Deprecated public static final int SHA1_DIGEST_ID = DNSSEC.Digest.SHA1;
/**
* SHA256 delegation signer digest ID.
*
* @deprecated use {@link DNSSEC.Digest#SHA256}
*/
@Deprecated public static final int SHA256_DIGEST_ID = DNSSEC.Digest.SHA256;
/**
* GOST4311 delegation signer digest ID.
*
* @deprecated use {@link DNSSEC.Digest#GOST3411}
*/
@Deprecated public static final int GOST3411_DIGEST_ID = DNSSEC.Digest.GOST3411;
/**
* SHA384 delegation signer digest ID.
*
* @deprecated use {@link DNSSEC.Digest#SHA384}
*/
@Deprecated public static final int SHA384_DIGEST_ID = DNSSEC.Digest.SHA384;
private int footprint;
private int alg;
private int digestid;
private byte[] digest;
DSRecord() {}
/**
* Creates a DS Record from the given data
*
* @param footprint The original KEY record's footprint (keyid).
* @param alg The original key algorithm.
* @param digestid The digest id code.
* @param digest A hash of the original key.
*/
protected DSRecord(
Name name,
int type,
int dclass,
long ttl,
int footprint,
int alg,
int digestid,
byte[] digest) {
super(name, type, dclass, ttl);
int len = DNSSEC.Digest.algLength(digestid);
if (len > -1 && len != digest.length) {
throw new IllegalArgumentException(
"Expected "
+ len
+ " bytes for "
+ DNSSEC.Digest.string(digestid)
+ ", got "
+ digest.length);
}
this.footprint = checkU16("footprint", footprint);
this.alg = checkU8("alg", alg);
this.digestid = checkU8("digestid", digestid);
this.digest = digest;
}
/**
* Creates a DS Record from the given data
*
* @param footprint The original KEY record's footprint (keyid).
* @param alg The original key algorithm.
* @param digestid The digest id code.
* @param digest A hash of the original key.
*/
public DSRecord(
Name name, int dclass, long ttl, int footprint, int alg, int digestid, byte[] digest) {
this(name, Type.DS, dclass, ttl, footprint, alg, digestid, digest);
}
/**
* Creates a DS Record from the given data
*
* @param digestid The digest id code.
* @param key The key to digest
*/
public DSRecord(Name name, int dclass, long ttl, int digestid, DNSKEYRecord key) {
this(
name,
dclass,
ttl,
key.getFootprint(),
key.getAlgorithm(),
digestid,
DNSSEC.generateDSDigest(key, digestid));
}
@Override
protected void rrFromWire(DNSInput in) throws IOException {
footprint = in.readU16();
alg = in.readU8();
digestid = in.readU8();
digest = in.readByteArray();
}
@Override
protected void rdataFromString(Tokenizer st, Name origin) throws IOException {
footprint = st.getUInt16();
alg = st.getUInt8();
digestid = st.getUInt8();
digest = st.getHex(true);
int len = DNSSEC.Digest.algLength(digestid);
if (len > -1 && len != digest.length) {
throw st.exception(
"Expected "
+ len
+ " bytes for "
+ DNSSEC.Digest.string(digestid)
+ ", got "
+ digest.length);
}
}
/** Converts rdata to a String */
@Override
protected String rrToString() {
StringBuilder sb = new StringBuilder();
sb.append(footprint);
sb.append(" ");
sb.append(alg);
sb.append(" ");
sb.append(digestid);
if (digest != null) {
sb.append(" ");
sb.append(base16.toString(digest));
}
return sb.toString();
}
/** Returns the key's algorithm. */
public int getAlgorithm() {
return alg;
}
/** Returns the key's Digest ID. */
public int getDigestID() {
return digestid;
}
/** Returns the binary hash of the key. */
public byte[] getDigest() {
return digest;
}
/** Returns the key's footprint. */
public int getFootprint() {
return footprint;
}
@Override
protected void rrToWire(DNSOutput out, Compression c, boolean canonical) {
out.writeU16(footprint);
out.writeU8(alg);
out.writeU8(digestid);
if (digest != null) {
out.writeByteArray(digest);
}
}
}