1 /*
   2  * Copyright (c) 1999, 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 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         if (isReadOnly())
 141             throw new SecurityException("attempt to add a Permission to " +
 142                                         "a readonly PermissionCollection");
 143 
 144         if (permission != CryptoAllPermission.INSTANCE)
 145             return;
 146 
 147         all_allowed = true;
 148     }
 149 
 150     /**
 151      * Check and see if this set of permissions implies the permissions
 152      * expressed in "permission".
 153      *
 154      * @param permission the Permission object to compare
 155      *
 156      * @return true if the given permission is implied by this
 157      * CryptoAllPermissionCollection.
 158      */
 159     public boolean implies(Permission permission) {
 160         if (!(permission instanceof CryptoPermission)) {
 161             return false;
 162         }
 163         return all_allowed;
 164     }
 165 
 166     /**
 167      * Returns an enumeration of all the CryptoAllPermission
 168      * objects in the  container.
 169      *
 170      * @return an enumeration of all the CryptoAllPermission objects.
 171      */
 172     public Enumeration<Permission> elements() {
 173         Vector<Permission> v = new Vector<>(1);
 174         if (all_allowed) v.add(CryptoAllPermission.INSTANCE);
 175         return v.elements();
 176     }
 177 }