Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* GnuDHPublicKey.java -- A Diffie-Hellman public key.
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.security.provider;
+
+import gnu.java.security.OID;
+import gnu.java.security.der.BitString;
+import gnu.java.security.der.DER;
+import gnu.java.security.der.DERValue;
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+
+import javax.crypto.interfaces.DHPublicKey;
+import javax.crypto.spec.DHParameterSpec;
+
+public class GnuDHPublicKey implements DHPublicKey
+{
+
+  // Fields.
+  // -------------------------------------------------------------------------
+
+  private byte[] encoded;
+  private final DHParameterSpec params;
+  private final BigInteger Y;
+  private final BigInteger q;
+
+  // Constructor.
+  // -------------------------------------------------------------------------
+
+  public GnuDHPublicKey(DHParameterSpec params, BigInteger Y, BigInteger q)
+  {
+    this.params = params;
+    this.Y = Y;
+    this.q = q;
+  }
+
+  // Instance methods.
+  // -------------------------------------------------------------------------
+
+  public BigInteger getY()
+  {
+    return Y;
+  }
+
+  public DHParameterSpec getParams()
+  {
+    return params;
+  }
+
+  public String getAlgorithm()
+  {
+    return "DH";
+  }
+
+  public String getFormat()
+  {
+    return "X.509";
+  }
+
+  public byte[] getEncoded()
+  {
+    if (encoded != null)
+      return (byte[]) encoded.clone();
+    ArrayList spki = new ArrayList(2);
+    ArrayList alg = new ArrayList(2);
+    alg.add(new DERValue(DER.OBJECT_IDENTIFIER, new OID("1.2.840.10046.2.1")));
+    ArrayList param = new ArrayList(3);
+    param.add(new DERValue(DER.INTEGER, params.getP()));
+    param.add(new DERValue(DER.INTEGER, params.getG()));
+    param.add(new DERValue(DER.INTEGER, q));
+    alg.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, param));
+    spki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
+    spki.add(new DERValue(DER.BIT_STRING, new BitString(Y.toByteArray())));
+    encoded = new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, spki).getEncoded();
+    if (encoded != null)
+      return (byte[]) encoded.clone();
+    return null;
+  }
+}