1 /* 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.security.timestamp; 27 28 import java.io.IOException; 29 import java.math.BigInteger; 30 import java.util.Date; 31 import sun.security.util.DerValue; 32 import sun.security.util.ObjectIdentifier; 33 import sun.security.x509.AlgorithmId; 34 35 /** 36 * This class provides the timestamp token info resulting from a successful 37 * timestamp request, as defined in 38 * <a href="http://www.ietf.org/rfc/rfc3161.txt">RFC 3161</a>. 39 * 40 * The timestampTokenInfo ASN.1 type has the following definition: 41 * <pre> 42 * 43 * TSTInfo ::= SEQUENCE { 44 * version INTEGER { v1(1) }, 45 * policy TSAPolicyId, 46 * messageImprint MessageImprint, 47 * -- MUST have the same value as the similar field in 48 * -- TimeStampReq 49 * serialNumber INTEGER, 50 * -- Time-Stamping users MUST be ready to accommodate integers 51 * -- up to 160 bits. 52 * genTime GeneralizedTime, 53 * accuracy Accuracy OPTIONAL, 54 * ordering BOOLEAN DEFAULT FALSE, 55 * nonce INTEGER OPTIONAL, 56 * -- MUST be present if the similar field was present 57 * -- in TimeStampReq. In that case it MUST have the same value. 58 * tsa [0] GeneralName OPTIONAL, 59 * extensions [1] IMPLICIT Extensions OPTIONAL } 60 * 61 * Accuracy ::= SEQUENCE { 62 * seconds INTEGER OPTIONAL, 63 * millis [0] INTEGER (1..999) OPTIONAL, 64 * micros [1] INTEGER (1..999) OPTIONAL } 65 * 66 * </pre> 67 * 68 * @since 1.5 69 * @see Timestamper 70 * @author Vincent Ryan 71 */ 72 73 public class TimestampToken { 74 75 private int version; 76 private ObjectIdentifier policy; 77 private BigInteger serialNumber; 78 private AlgorithmId hashAlgorithm; 79 private byte[] hashedMessage; 80 private Date genTime; 81 private BigInteger nonce; 82 83 /** 84 * Constructs an object to store a timestamp token. 85 * 86 * @param status A buffer containing the ASN.1 BER encoding of the 87 * TSTInfo element defined in RFC 3161. 88 */ 89 public TimestampToken(byte[] timestampTokenInfo) throws IOException { 90 if (timestampTokenInfo == null) { 91 throw new IOException("No timestamp token info"); 92 } 93 parse(timestampTokenInfo); 94 } 95 96 /** 97 * Extract the date and time from the timestamp token. 98 * 99 * @return The date and time when the timestamp was generated. 100 */ 101 public Date getDate() { 102 return genTime; 103 } 104 105 public AlgorithmId getHashAlgorithm() { 106 return hashAlgorithm; 107 } 108 109 // should only be used internally, otherwise return a clone 110 public byte[] getHashedMessage() { 111 return hashedMessage; 112 } 113 114 public BigInteger getNonce() { 115 return nonce; 116 } 117 118 public String getPolicyID() { 119 return policy.toString(); 120 } 121 122 public BigInteger getSerialNumber() { 123 return serialNumber; 124 } 125 126 /* 127 * Parses the timestamp token info. 128 * 129 * @param timestampTokenInfo A buffer containing an ASN.1 BER encoded 130 * TSTInfo. 131 * @throws IOException The exception is thrown if a problem is encountered 132 * while parsing. 133 */ 134 private void parse(byte[] timestampTokenInfo) throws IOException { 135 136 DerValue tstInfo = new DerValue(timestampTokenInfo); 137 if (tstInfo.tag != DerValue.tag_Sequence) { 138 throw new IOException("Bad encoding for timestamp token info"); 139 } 140 // Parse version 141 version = tstInfo.data.getInteger(); 142 143 // Parse policy 144 policy = tstInfo.data.getOID(); 145 146 // Parse messageImprint 147 DerValue messageImprint = tstInfo.data.getDerValue(); 148 hashAlgorithm = AlgorithmId.parse(messageImprint.data.getDerValue()); 149 hashedMessage = messageImprint.data.getOctetString(); 150 151 // Parse serialNumber 152 serialNumber = tstInfo.data.getBigInteger(); 153 154 // Parse genTime 155 genTime = tstInfo.data.getGeneralizedTime(); 156 157 // Parse optional elements, if present 158 while (tstInfo.data.available() > 0) { 159 DerValue d = tstInfo.data.getDerValue(); 160 if (d.tag == DerValue.tag_Integer) { // must be the nonce 161 nonce = d.getBigInteger(); 162 break; 163 } 164 165 // Additional fields: 166 // Parse accuracy 167 // Parse ordering 168 // Parse tsa 169 // Parse extensions 170 } 171 } 172 } 173
