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25 
26 package java.security;
27 
28 import java.io.*;
29 import java.security.cert.CertPath;
30 
31 /**
32  * This class encapsulates information about a code signer.
33  * It is immutable.
34  *
35  * @since 1.5
36  * @author Vincent Ryan
37  */
38 
39 public final class CodeSigner implements Serializable {
40 
41     private static final long serialVersionUID = 6819288105193937581L;
42 
43     /**
44      * The signer's certificate path.
45      *
46      * @serial
47      */
48     private CertPath signerCertPath;
49 
50     /*
51      * The signature timestamp.
52      *
53      * @serial
54      */
55     private Timestamp timestamp;
56 
57     /*
58      * Hash code for this code signer.
59      */
60     private transient int myhash = -1;
61 
62     /**
63      * Constructs a CodeSigner object.
64      *
65      * @param signerCertPath The signer's certificate path.
66      *                       It must not be {@code null}.
67      * @param timestamp A signature timestamp.
68      *                  If {@code null} then no timestamp was generated
69      *                  for the signature.
70      * @throws NullPointerException if {@code signerCertPath} is
71      *                              {@code null}.
72      */
CodeSigner(CertPath signerCertPath, Timestamp timestamp)73     public CodeSigner(CertPath signerCertPath, Timestamp timestamp) {
74         if (signerCertPath == null) {
75             throw new NullPointerException();
76         }
77         this.signerCertPath = signerCertPath;
78         this.timestamp = timestamp;
79     }
80 
81     /**
82      * Returns the signer's certificate path.
83      *
84      * @return A certificate path.
85      */
getSignerCertPath()86     public CertPath getSignerCertPath() {
87         return signerCertPath;
88     }
89 
90     /**
91      * Returns the signature timestamp.
92      *
93      * @return The timestamp or {@code null} if none is present.
94      */
getTimestamp()95     public Timestamp getTimestamp() {
96         return timestamp;
97     }
98 
99     /**
100      * Returns the hash code value for this code signer.
101      * The hash code is generated using the signer's certificate path and the
102      * timestamp, if present.
103      *
104      * @return a hash code value for this code signer.
105      */
hashCode()106     public int hashCode() {
107         if (myhash == -1) {
108             if (timestamp == null) {
109                 myhash = signerCertPath.hashCode();
110             } else {
111                 myhash = signerCertPath.hashCode() + timestamp.hashCode();
112             }
113         }
114         return myhash;
115     }
116 
117     /**
118      * Tests for equality between the specified object and this
119      * code signer. Two code signers are considered equal if their
120      * signer certificate paths are equal and if their timestamps are equal,
121      * if present in both.
122      *
123      * @param obj the object to test for equality with this object.
124      *
125      * @return true if the objects are considered equal, false otherwise.
126      */
equals(Object obj)127     public boolean equals(Object obj) {
128         if (obj == null || (!(obj instanceof CodeSigner))) {
129             return false;
130         }
131         CodeSigner that = (CodeSigner)obj;
132 
133         if (this == that) {
134             return true;
135         }
136         Timestamp thatTimestamp = that.getTimestamp();
137         if (timestamp == null) {
138             if (thatTimestamp != null) {
139                 return false;
140             }
141         } else {
142             if (thatTimestamp == null ||
143                 (! timestamp.equals(thatTimestamp))) {
144                 return false;
145             }
146         }
147         return signerCertPath.equals(that.getSignerCertPath());
148     }
149 
150     /**
151      * Returns a string describing this code signer.
152      *
153      * @return A string comprising the signer's certificate and a timestamp,
154      *         if present.
155      */
toString()156     public String toString() {
157         StringBuilder sb = new StringBuilder();
158         sb.append("(");
159         sb.append("Signer: " + signerCertPath.getCertificates().get(0));
160         if (timestamp != null) {
161             sb.append("timestamp: " + timestamp);
162         }
163         sb.append(")");
164         return sb.toString();
165     }
166 
167     // Explicitly reset hash code value to -1
readObject(ObjectInputStream ois)168     private void readObject(ObjectInputStream ois)
169         throws IOException, ClassNotFoundException {
170      ois.defaultReadObject();
171      myhash = -1;
172     }
173 }
174