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diff --git a/libjava/classpath/gnu/java/security/provider/DiffieHellmanKeyPairGeneratorImpl.java b/libjava/classpath/gnu/java/security/provider/DiffieHellmanKeyPairGeneratorImpl.java
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+/* DiffieHellmanKeyPairGeneratorImpl.java --
+   Copyright (C) 2005 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.javax.crypto.GnuDHPrivateKey;
+
+import java.math.BigInteger;
+
+import java.security.KeyPair;
+import java.security.KeyPairGeneratorSpi;
+import java.security.SecureRandom;
+import java.security.spec.AlgorithmParameterSpec;
+
+import javax.crypto.spec.DHParameterSpec;
+
+public class DiffieHellmanKeyPairGeneratorImpl extends KeyPairGeneratorSpi
+{
+  private SecureRandom random;
+  private DHParameterSpec params;
+
+  public KeyPair generateKeyPair ()
+  {
+    if (params == null || random == null)
+      throw new IllegalStateException ("not initialized");
+    byte[] buf = new byte[(params.getP ().bitLength() >>> 3)];
+    random.nextBytes (buf);
+    BigInteger x = new BigInteger (1, buf);
+    BigInteger y = params.getG ().modPow (x, params.getP ());
+    GnuDHPublicKey pub = new GnuDHPublicKey (params, y, null);
+    GnuDHPrivateKey priv = new GnuDHPrivateKey (x, params);
+
+    return new KeyPair (pub, priv);
+  }
+
+  public void initialize (final int keysize, final SecureRandom random)
+  {
+    throw new UnsupportedOperationException ("key generation without parameters not supported");
+  }
+
+  public void initialize (final AlgorithmParameterSpec params,
+                          final SecureRandom random)
+  {
+    if (!(params instanceof DHParameterSpec))
+      throw new IllegalArgumentException ("expecting Diffie-Hellman parameters");
+    this.params = (DHParameterSpec) params;
+    this.random = random;
+    if (this.random == null)
+      this.random = new SecureRandom ();
+  }
+}