libjava/classpath/javax/security/auth/kerberos/KerberosKey.java

   1 /* KerberosKey.java -- kerberos key
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.security.auth.kerberos;
  40
  41 import gnu.classpath.NotImplementedException;
  42
  43 import java.io.Serializable;
  44
  45 import javax.crypto.SecretKey;
  46 import javax.security.auth.DestroyFailedException;
  47 import javax.security.auth.Destroyable;
  48
  49 /**
  50  * This class represents a Kerberos key.  See the Kerberos
  51  * authentication RFC for more information:
  52  * <a href="http://www.ietf.org/rfc/rfc1510.txt">RFC 1510</a>.
  53  *
  54  * @since 1.4
  55  */
  56 public class KerberosKey
  57     implements Serializable, SecretKey, Destroyable
  58 {
  59   private static final long serialVersionUID = -4625402278148246993L;
  60
  61   private KerberosPrincipal principal;
  62   private int versionNum;
  63   private KeyImpl key;
  64
  65   /**
  66    * Construct a new key with the indicated principal and key.
  67    * @param principal the principal
  68    * @param key the key's data
  69    * @param type the key's type
  70    * @param version the key's version number
  71    */
  72   public KerberosKey(KerberosPrincipal principal, byte[] key, int type,
  73                      int version)
  74   {
  75     this.principal = principal;
  76     this.versionNum = version;
  77     this.key = new KeyImpl(key, type);
  78   }
  79
  80   /**
  81    * Construct a new key with the indicated principal and a password.
  82    * @param principal the principal
  83    * @param passwd the password to use
  84    * @param algo the algorithm; if null the "DES" algorithm is used
  85    */
  86   public KerberosKey(KerberosPrincipal principal, char[] passwd, String algo)
  87   // Not implemented because KeyImpl really does nothing here.
  88     throws NotImplementedException
  89   {
  90     this.principal = principal;
  91     this.versionNum = 0; // FIXME: correct?
  92     this.key = new KeyImpl(passwd, algo);
  93   }
  94
  95   /**
  96    * Return the name of the algorithm used to create this key.
  97    */
  98   public final String getAlgorithm()
  99   {
 100     checkDestroyed();
 101     return key.algorithm;
 102   }
 103
 104   /**
 105    * Return the format of this key.  This implementation always returns "RAW".
 106    */
 107   public final String getFormat()
 108   {
 109     checkDestroyed();
 110     // Silly, but specified.
 111     return "RAW";
 112   }
 113
 114   /**
 115    * Return the principal associated with this key.
 116    */
 117   public final KerberosPrincipal getPrincipal()
 118   {
 119     checkDestroyed();
 120     return principal;
 121   }
 122
 123   /**
 124    * Return the type of this key.
 125    */
 126   public final int getKeyType()
 127   {
 128     checkDestroyed();
 129     return key.type;
 130   }
 131
 132   /**
 133    * Return the version number of this key.
 134    */
 135   public final int getVersionNumber()
 136   {
 137     checkDestroyed();
 138     return versionNum;
 139   }
 140
 141   /**
 142    * Return the encoded form of this key.
 143    */
 144   public final byte[] getEncoded()
 145   {
 146     checkDestroyed();
 147     return (byte[]) key.key.clone();
 148   }
 149
 150   /**
 151    * Destroy this key.
 152    */
 153   public void destroy() throws DestroyFailedException
 154   {
 155     if (key == null)
 156       throw new DestroyFailedException("already destroyed");
 157     key = null;
 158   }
 159
 160   /**
 161    * Return true if this key has been destroyed.  After this has been
 162    * called, other methods on this object will throw IllegalStateException.
 163    */
 164   public boolean isDestroyed()
 165   {
 166     return key == null;
 167   }
 168
 169   private void checkDestroyed()
 170   {
 171     if (key == null)
 172       throw new IllegalStateException("key is destroyed");
 173   }
 174
 175   public String toString()
 176   {
 177     // FIXME: random choice here.
 178     return principal + ":" + versionNum;
 179   }
 180 }