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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2011, 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 java.security; | |
| 27 | + | |
| 28 | +import java.io.*; | |
| 29 | +import java.security.cert.Certificate; | |
| 30 | +import java.security.cert.CertPath; | |
| 31 | +import java.security.cert.X509Extension; | |
| 32 | +import java.util.Date; | |
| 33 | +import java.util.List; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * This class encapsulates information about a signed timestamp. | |
| 37 | + * It is immutable. | |
| 38 | + * It includes the timestamp's date and time as well as information about the | |
| 39 | + * Timestamping Authority (TSA) which generated and signed the timestamp. | |
| 40 | + * | |
| 41 | + * @since 1.5 | |
| 42 | + * @author Vincent Ryan | |
| 43 | + */ | |
| 44 | + | |
| 45 | +public final class Timestamp implements Serializable { | |
| 46 | + | |
| 47 | + private static final long serialVersionUID = -5502683707821851294L; | |
| 48 | + | |
| 49 | + /** | |
| 50 | + * The timestamp's date and time | |
| 51 | + * | |
| 52 | + * @serial | |
| 53 | + */ | |
| 54 | + private Date timestamp; | |
| 55 | + | |
| 56 | + /** | |
| 57 | + * The TSA's certificate path. | |
| 58 | + * | |
| 59 | + * @serial | |
| 60 | + */ | |
| 61 | + private CertPath signerCertPath; | |
| 62 | + | |
| 63 | + /* | |
| 64 | + * Hash code for this timestamp. | |
| 65 | + */ | |
| 66 | + private transient int myhash = -1; | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Constructs a Timestamp. | |
| 70 | + * | |
| 71 | + * @param timestamp is the timestamp's date and time. It must not be null. | |
| 72 | + * @param signerCertPath is the TSA's certificate path. It must not be null. | |
| 73 | + * @throws NullPointerException if timestamp or signerCertPath is null. | |
| 74 | + */ | |
| 75 | + public Timestamp(Date timestamp, CertPath signerCertPath) { | |
| 76 | + if (timestamp == null || signerCertPath == null) { | |
| 77 | + throw new NullPointerException(); | |
| 78 | + } | |
| 79 | + this.timestamp = new Date(timestamp.getTime()); // clone | |
| 80 | + this.signerCertPath = signerCertPath; | |
| 81 | + } | |
| 82 | + | |
| 83 | + /** | |
| 84 | + * Returns the date and time when the timestamp was generated. | |
| 85 | + * | |
| 86 | + * @return The timestamp's date and time. | |
| 87 | + */ | |
| 88 | + public Date getTimestamp() { | |
| 89 | + return new Date(timestamp.getTime()); // clone | |
| 90 | + } | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Returns the certificate path for the Timestamping Authority. | |
| 94 | + * | |
| 95 | + * @return The TSA's certificate path. | |
| 96 | + */ | |
| 97 | + public CertPath getSignerCertPath() { | |
| 98 | + return signerCertPath; | |
| 99 | + } | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Returns the hash code value for this timestamp. | |
| 103 | + * The hash code is generated using the date and time of the timestamp | |
| 104 | + * and the TSA's certificate path. | |
| 105 | + * | |
| 106 | + * @return a hash code value for this timestamp. | |
| 107 | + */ | |
| 108 | + public int hashCode() { | |
| 109 | + if (myhash == -1) { | |
| 110 | + myhash = timestamp.hashCode() + signerCertPath.hashCode(); | |
| 111 | + } | |
| 112 | + return myhash; | |
| 113 | + } | |
| 114 | + | |
| 115 | + /** | |
| 116 | + * Tests for equality between the specified object and this | |
| 117 | + * timestamp. Two timestamps are considered equal if the date and time of | |
| 118 | + * their timestamp's and their signer's certificate paths are equal. | |
| 119 | + * | |
| 120 | + * @param obj the object to test for equality with this timestamp. | |
| 121 | + * | |
| 122 | + * @return true if the timestamp are considered equal, false otherwise. | |
| 123 | + */ | |
| 124 | + public boolean equals(Object obj) { | |
| 125 | + if (obj == null || (!(obj instanceof Timestamp))) { | |
| 126 | + return false; | |
| 127 | + } | |
| 128 | + Timestamp that = (Timestamp)obj; | |
| 129 | + | |
| 130 | + if (this == that) { | |
| 131 | + return true; | |
| 132 | + } | |
| 133 | + return (timestamp.equals(that.getTimestamp()) && | |
| 134 | + signerCertPath.equals(that.getSignerCertPath())); | |
| 135 | + } | |
| 136 | + | |
| 137 | + /** | |
| 138 | + * Returns a string describing this timestamp. | |
| 139 | + * | |
| 140 | + * @return A string comprising the date and time of the timestamp and | |
| 141 | + * its signer's certificate. | |
| 142 | + */ | |
| 143 | + public String toString() { | |
| 144 | + StringBuffer sb = new StringBuffer(); | |
| 145 | + sb.append("("); | |
| 146 | + sb.append("timestamp: " + timestamp); | |
| 147 | + List<? extends Certificate> certs = signerCertPath.getCertificates(); | |
| 148 | + if (!certs.isEmpty()) { | |
| 149 | + sb.append("TSA: " + certs.get(0)); | |
| 150 | + } else { | |
| 151 | + sb.append("TSA: <empty>"); | |
| 152 | + } | |
| 153 | + sb.append(")"); | |
| 154 | + return sb.toString(); | |
| 155 | + } | |
| 156 | + | |
| 157 | + // Explicitly reset hash code value to -1 | |
| 158 | + private void readObject(ObjectInputStream ois) | |
| 159 | + throws IOException, ClassNotFoundException { | |
| 160 | + ois.defaultReadObject(); | |
| 161 | + myhash = -1; | |
| 162 | + timestamp = new Date(timestamp.getTime()); | |
| 163 | + } | |
| 164 | +} | |