Source for gnu.java.security.x509.ext.BasicConstraints

   1: /* BasicConstraints.java -- the basic constraints extension.
   2:    Copyright (C) 2004  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 gnu.java.security.x509.ext;
  40: 
  41: import gnu.java.security.OID;
  42: import gnu.java.security.der.DER;
  43: import gnu.java.security.der.DERReader;
  44: import gnu.java.security.der.DERValue;
  45: 
  46: import java.io.IOException;
  47: import java.math.BigInteger;
  48: import java.util.ArrayList;
  49: import java.util.List;
  50: 
  51: public class BasicConstraints extends Extension.Value
  52: {
  53: 
  54:   // Constants and fields.
  55:   // -------------------------------------------------------------------------
  56: 
  57:   public static final OID ID = new OID("2.5.29.19");
  58: 
  59:   private final boolean ca;
  60:   private final int pathLenConstraint;
  61: 
  62:   // Constructor.
  63:   // -------------------------------------------------------------------------
  64: 
  65:   public BasicConstraints(final byte[] encoded) throws IOException
  66:   {
  67:     super(encoded);
  68:     DERReader der = new DERReader(encoded);
  69:     DERValue bc = der.read();
  70:     if (!bc.isConstructed())
  71:       throw new IOException("malformed BasicConstraints");
  72:     DERValue val = bc;
  73:     if (bc.getLength() > 0)
  74:       val = der.read();
  75:     if (val.getTag() == DER.BOOLEAN)
  76:       {
  77:         ca = ((Boolean) val.getValue()).booleanValue();
  78:         if (val.getEncodedLength() < bc.getLength())
  79:           val = der.read();
  80:       }
  81:     else
  82:       ca = false;
  83:     if (val.getTag() == DER.INTEGER)
  84:       {
  85:         pathLenConstraint = ((BigInteger) val.getValue()).intValue();
  86:       }
  87:     else
  88:       pathLenConstraint = -1;
  89:   }
  90: 
  91:   public BasicConstraints (final boolean ca, final int pathLenConstraint)
  92:   {
  93:     this.ca = ca;
  94:     this.pathLenConstraint = pathLenConstraint;
  95:   }
  96: 
  97:   // Instance methods.
  98:   // -------------------------------------------------------------------------
  99: 
 100:   public boolean isCA()
 101:   {
 102:     return ca;
 103:   }
 104: 
 105:   public int getPathLengthConstraint()
 106:   {
 107:     return pathLenConstraint;
 108:   }
 109: 
 110:   public byte[] getEncoded()
 111:   {
 112:     if (encoded == null)
 113:       {
 114:         List bc = new ArrayList (2);
 115:         bc.add (new DERValue (DER.BOOLEAN, Boolean.valueOf (ca)));
 116:         if (pathLenConstraint >= 0)
 117:           bc.add (new DERValue (DER.INTEGER,
 118:                                 BigInteger.valueOf ((long) pathLenConstraint)));
 119:         encoded = new DERValue (DER.CONSTRUCTED|DER.SEQUENCE, bc).getEncoded();
 120:       }
 121:     return (byte[]) encoded.clone();
 122:   }
 123: 
 124:   public String toString()
 125:   {
 126:     return BasicConstraints.class.getName() + " [ isCA=" + ca +
 127:       " pathLen=" + pathLenConstraint + " ]";
 128:   }
 129: }