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diff --git a/gnu/javax/crypto/key/dh/GnuDHPrivateKey.java b/gnu/javax/crypto/key/dh/GnuDHPrivateKey.java
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+/* GnuDHPrivateKey.java -- 
+   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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.javax.crypto.key.dh;
+
+import gnu.java.security.Registry;
+import gnu.java.security.key.IKeyPairCodec;
+
+import java.math.BigInteger;
+import javax.crypto.interfaces.DHPrivateKey;
+
+/**
+ * <p>An implementation of the Diffie-Hellman private key.</p>
+ *
+ * <p>Reference:</p>
+ * <ol>
+ *    <li><a href="http://www.ietf.org/rfc/rfc2631.txt">Diffie-Hellman Key
+ *    Agreement Method</a><br>
+ *    Eric Rescorla.</li>
+ * </ol>
+ */
+public class GnuDHPrivateKey extends GnuDHKey implements DHPrivateKey
+{
+
+  // Constants and variables
+  // -------------------------------------------------------------------------
+
+  /** The private exponent. */
+  private final BigInteger x;
+
+  // Constructor(s)
+  // -------------------------------------------------------------------------
+
+  public GnuDHPrivateKey(BigInteger q, BigInteger p, BigInteger g, BigInteger x)
+  {
+    super(q, p, g);
+
+    this.x = x;
+  }
+
+  // Class methods
+  // -------------------------------------------------------------------------
+
+  /**
+   * <p>A class method that takes the output of the <code>encodePrivateKey()</code>
+   * method of a DH keypair codec object (an instance implementing
+   * {@link IKeyPairCodec} for DH keys, and re-constructs an instance of this
+   * object.</p>
+   *
+   * @param k the contents of a previously encoded instance of this object.
+   * @exception ArrayIndexOutOfBoundsException if there is not enough bytes,
+   * in <code>k</code>, to represent a valid encoding of an instance of
+   * this object.
+   * @exception IllegalArgumentException if the byte sequence does not
+   * represent a valid encoding of an instance of this object.
+   */
+  public static GnuDHPrivateKey valueOf(byte[] k)
+  {
+    // check magic...
+    // we should parse here enough bytes to know which codec to use, and
+    // direct the byte array to the appropriate codec.  since we only have one
+    // codec, we could have immediately tried it; nevertheless since testing
+    // one byte is cheaper than instatiating a codec that will fail we test
+    // the first byte before we carry on.
+    if (k[0] == Registry.MAGIC_RAW_DH_PRIVATE_KEY[0])
+      {
+        // it's likely to be in raw format. get a raw codec and hand it over
+        IKeyPairCodec codec = new DHKeyPairRawCodec();
+        return (GnuDHPrivateKey) codec.decodePrivateKey(k);
+      }
+    else
+      {
+        throw new IllegalArgumentException("magic");
+      }
+  }
+
+  // Instance methods
+  // -------------------------------------------------------------------------
+
+  // java.security.Key interface implementation ------------------------------
+
+  /** @deprecated see getEncoded(int). */
+  public byte[] getEncoded()
+  {
+    return getEncoded(IKeyPairCodec.RAW_FORMAT);
+  }
+
+  // javax.crypto.interfaces.DHPrivateKey interface implementation -----------
+
+  public BigInteger getX()
+  {
+    return x;
+  }
+
+  // other methods -----------------------------------------------------------
+
+  /**
+   * <p>Returns the encoded form of this private key according to the
+   * designated format.</p>
+   *
+   * @param format the desired format identifier of the resulting encoding.
+   * @return the byte sequence encoding this key according to the designated
+   * format.
+   * @exception IllegalArgumentException if the format is not supported.
+   * @see gnu.crypto.key.dh.DHKeyPairRawCodec
+   */
+  public byte[] getEncoded(int format)
+  {
+    byte[] result;
+    switch (format)
+      {
+      case IKeyPairCodec.RAW_FORMAT:
+        result = new DHKeyPairRawCodec().encodePrivateKey(this);
+        break;
+      default:
+        throw new IllegalArgumentException("format");
+      }
+    return result;
+  }
+}