1 /*
2 * Copyright (c) 1999, 2007, 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 javax.crypto;
27
28 import java.security.*;
29 import java.util.Enumeration;
30 import java.util.Vector;
31
32 /**
33 * The CryptoAllPermission is a permission that implies
34 * any other crypto permissions.
35 * <p>
36 *
37 * @see java.security.Permission
38 * @see java.security.AllPermission
39 *
40 * @author Sharon Liu
41 * @since 1.4
42 */
43
44 final class CryptoAllPermission extends CryptoPermission {
45
46 private static final long serialVersionUID = -5066513634293192112L;
47
48 // This class is similar to java.security.AllPermission.
49 static final String ALG_NAME = "CryptoAllPermission";
50 static final CryptoAllPermission INSTANCE =
51 new CryptoAllPermission();
52
53 private CryptoAllPermission() {
54 super(ALG_NAME);
55 }
56
57 /**
58 * Checks if the specified permission is implied by
59 * this object.
60 *
61 * @param p the permission to check against.
62 *
63 * @return true if the specified permission is an
64 * instance of CryptoPermission.
65 */
66 public boolean implies(Permission p) {
67 return (p instanceof CryptoPermission);
68 }
69
70 /**
71 * Checks two CryptoAllPermission objects for equality.
72 * Two CryptoAllPermission objects are always equal.
73 *
74 * @param obj the object to test for equality with this object.
75 *
76 * @return true if <i>obj</i> is a CryptoAllPermission object.
77 */
78 public boolean equals(Object obj) {
79 return (obj == INSTANCE);
80 }
81
82 /**
83 *
84 * Returns the hash code value for this object.
85 *
86 * @return a hash code value for this object.
87 */
88 public int hashCode() {
89 return 1;
90 }
91
92 /**
93 * Returns a new PermissionCollection object for storing
94 * CryptoAllPermission objects.
95 * <p>
96 *
97 * @return a new PermissionCollection object suitable for
98 * storing CryptoAllPermissions.
99 */
100 public PermissionCollection newPermissionCollection() {
101 return new CryptoAllPermissionCollection();
102 }
103 }
104
105 /**
106 * A CryptoAllPermissionCollection stores a collection
107 * of CryptoAllPermission permissions.
108 *
109 * @see java.security.Permission
110 * @see java.security.Permissions
111 * @see javax.crypto.CryptoPermission
112 *
113 * @author Sharon Liu
114 */
115 final class CryptoAllPermissionCollection extends PermissionCollection
116 implements java.io.Serializable
117 {
118
119 private static final long serialVersionUID = 7450076868380144072L;
120
121 // true if a CryptoAllPermission has been added
122 private boolean all_allowed;
123
124 /**
125 * Create an empty CryptoAllPermissions object.
126 */
127 CryptoAllPermissionCollection() {
128 all_allowed = false;
129 }
130
131 /**
132 * Adds a permission to the CryptoAllPermissions.
133 *
134 * @param permission the Permission object to add.
135 *
136 * @exception SecurityException - if this CryptoAllPermissionCollection
137 * object has been marked readonly
138 */
139 public void add(Permission permission)
140 {
141 if (isReadOnly())
142 throw new SecurityException("attempt to add a Permission to " +
143 "a readonly PermissionCollection");
144
145 if (permission != CryptoAllPermission.INSTANCE)
146 return;
147
148 all_allowed = true;
149 }
150
151 /**
152 * Check and see if this set of permissions implies the permissions
153 * expressed in "permission".
154 *
155 * @param p the Permission object to compare
156 *
157 * @return true if the given permission is implied by this
158 * CryptoAllPermissionCollection.
159 */
160 public boolean implies(Permission permission)
161 {
162 if (!(permission instanceof CryptoPermission)) {
163 return false;
164 }
165 return all_allowed;
166 }
167
168 /**
169 * Returns an enumeration of all the CryptoAllPermission
170 * objects in the container.
171 *
172 * @return an enumeration of all the CryptoAllPermission objects.
173 */
174 public Enumeration elements() {
175 Vector v = new Vector(1);
176 if (all_allowed) v.add(CryptoAllPermission.INSTANCE);
177 return v.elements();
178 }
179 }