Source for javax.security.auth.kerberos.KerberosKey

   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: }