Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 2002-2004 Brian Wellington (bwelling@xbill.org) |
| 2 | |
| 3 | package org.xbill.DNS; |
| 4 | |
| 5 | import java.io.*; |
| 6 | import org.xbill.DNS.utils.*; |
| 7 | |
| 8 | /** |
| 9 | * DS - contains a Delegation Signer record, which acts as a |
| 10 | * placeholder for KEY records in the parent zone. |
| 11 | * @see DNSSEC |
| 12 | * |
| 13 | * @author David Blacka |
| 14 | * @author Brian Wellington |
| 15 | */ |
| 16 | |
| 17 | public class DSRecord extends Record { |
| 18 | |
| 19 | public static class Digest { |
| 20 | private Digest() {} |
| 21 | |
| 22 | /** SHA-1 */ |
| 23 | public static final int SHA1 = 1; |
| 24 | |
| 25 | /** SHA-256 */ |
| 26 | public static final int SHA256 = 2; |
| 27 | |
| 28 | /** SHA-384 */ |
| 29 | public static final int SHA384 = 4; |
| 30 | } |
| 31 | |
| 32 | public static final int SHA1_DIGEST_ID = Digest.SHA1; |
| 33 | public static final int SHA256_DIGEST_ID = Digest.SHA256; |
| 34 | public static final int SHA384_DIGEST_ID = Digest.SHA384; |
| 35 | |
| 36 | private static final long serialVersionUID = -9001819329700081493L; |
| 37 | |
| 38 | private int footprint; |
| 39 | private int alg; |
| 40 | private int digestid; |
| 41 | private byte [] digest; |
| 42 | |
| 43 | DSRecord() {} |
| 44 | |
| 45 | Record |
| 46 | getObject() { |
| 47 | return new DSRecord(); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Creates a DS Record from the given data |
| 52 | * @param footprint The original KEY record's footprint (keyid). |
| 53 | * @param alg The original key algorithm. |
| 54 | * @param digestid The digest id code. |
| 55 | * @param digest A hash of the original key. |
| 56 | */ |
| 57 | public |
| 58 | DSRecord(Name name, int dclass, long ttl, int footprint, int alg, |
| 59 | int digestid, byte [] digest) |
| 60 | { |
| 61 | super(name, Type.DS, dclass, ttl); |
| 62 | this.footprint = checkU16("footprint", footprint); |
| 63 | this.alg = checkU8("alg", alg); |
| 64 | this.digestid = checkU8("digestid", digestid); |
| 65 | this.digest = digest; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Creates a DS Record from the given data |
| 70 | * @param digestid The digest id code. |
| 71 | * @param key The key to digest |
| 72 | */ |
| 73 | public |
| 74 | DSRecord(Name name, int dclass, long ttl, int digestid, DNSKEYRecord key) |
| 75 | { |
| 76 | this(name, dclass, ttl, key.getFootprint(), key.getAlgorithm(), |
| 77 | digestid, DNSSEC.generateDSDigest(key, digestid)); |
| 78 | } |
| 79 | |
| 80 | void |
| 81 | rrFromWire(DNSInput in) throws IOException { |
| 82 | footprint = in.readU16(); |
| 83 | alg = in.readU8(); |
| 84 | digestid = in.readU8(); |
| 85 | digest = in.readByteArray(); |
| 86 | } |
| 87 | |
| 88 | void |
| 89 | rdataFromString(Tokenizer st, Name origin) throws IOException { |
| 90 | footprint = st.getUInt16(); |
| 91 | alg = st.getUInt8(); |
| 92 | digestid = st.getUInt8(); |
| 93 | digest = st.getHex(); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Converts rdata to a String |
| 98 | */ |
| 99 | String |
| 100 | rrToString() { |
| 101 | StringBuffer sb = new StringBuffer(); |
| 102 | sb.append(footprint); |
| 103 | sb.append(" "); |
| 104 | sb.append(alg); |
| 105 | sb.append(" "); |
| 106 | sb.append(digestid); |
| 107 | if (digest != null) { |
| 108 | sb.append(" "); |
| 109 | sb.append(base16.toString(digest)); |
| 110 | } |
| 111 | |
| 112 | return sb.toString(); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Returns the key's algorithm. |
| 117 | */ |
| 118 | public int |
| 119 | getAlgorithm() { |
| 120 | return alg; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Returns the key's Digest ID. |
| 125 | */ |
| 126 | public int |
| 127 | getDigestID() |
| 128 | { |
| 129 | return digestid; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Returns the binary hash of the key. |
| 134 | */ |
| 135 | public byte [] |
| 136 | getDigest() { |
| 137 | return digest; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Returns the key's footprint. |
| 142 | */ |
| 143 | public int |
| 144 | getFootprint() { |
| 145 | return footprint; |
| 146 | } |
| 147 | |
| 148 | void |
| 149 | rrToWire(DNSOutput out, Compression c, boolean canonical) { |
| 150 | out.writeU16(footprint); |
| 151 | out.writeU8(alg); |
| 152 | out.writeU8(digestid); |
| 153 | if (digest != null) |
| 154 | out.writeByteArray(digest); |
| 155 | } |
| 156 | |
| 157 | } |