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diff --git a/libjava/classpath/gnu/javax/crypto/jce/sig/DHParametersGenerator.java b/libjava/classpath/gnu/javax/crypto/jce/sig/DHParametersGenerator.java
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+/* DHParametersGenerator.java -- JCE Adapter for a generator of DH parameters
+   Copyright (C) 2006 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.javax.crypto.jce.sig;
+
+import gnu.java.security.Registry;
+import gnu.javax.crypto.jce.GnuCrypto;
+import gnu.javax.crypto.key.dh.GnuDHKeyPairGenerator;
+import gnu.javax.crypto.key.dh.RFC2631;
+
+import java.math.BigInteger;
+import java.security.AlgorithmParameterGeneratorSpi;
+import java.security.AlgorithmParameters;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidParameterException;
+import java.security.NoSuchAlgorithmException;
+import java.security.Provider;
+import java.security.SecureRandom;
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.InvalidParameterSpecException;
+
+import javax.crypto.spec.DHGenParameterSpec;
+import javax.crypto.spec.DHParameterSpec;
+
+/**
+ * A JCE Adapter for a generator of DH parameters.
+ */
+public class DHParametersGenerator
+    extends AlgorithmParameterGeneratorSpi
+{
+  private static final Provider GNU_CRYPTO = new GnuCrypto();
+
+  /** Size of the prime (public) modulus in bits. */
+  private int modulusSize = -1;
+
+  /** Size of the prime (private) modulus in bits. */
+  private int exponentSize = -1;
+
+  /** User specified source of randomness. */
+  private SecureRandom rnd;
+
+  /** Our concrete DH parameters generator. */
+  private RFC2631 rfc2631;
+
+
+  protected void engineInit(int size, SecureRandom random)
+  {
+    if ((size % 256) != 0 || size < GnuDHKeyPairGenerator.DEFAULT_PRIME_SIZE)
+      throw new InvalidParameterException("Prime modulus (p) size (in bits) "
+                                          + "MUST be a multiple of 256, and "
+                                          + "greater than or equal to 1024");
+    this.modulusSize = size;
+    this.rnd = random;
+  }
+
+  protected void engineInit(AlgorithmParameterSpec spec, SecureRandom random)
+      throws InvalidAlgorithmParameterException
+  {
+    if (spec instanceof DHParameterSpec)
+      {
+        DHParameterSpec dhSpec = (DHParameterSpec) spec;
+        BigInteger p = dhSpec.getP();
+        int size = p.bitLength();
+        this.engineInit(size, random);
+      }
+    else if (spec instanceof DHGenParameterSpec)
+      {
+        DHGenParameterSpec dhSpec = (DHGenParameterSpec) spec;
+        int size = dhSpec.getPrimeSize();
+        this.engineInit(size, random);
+        exponentSize = dhSpec.getExponentSize();
+
+        if ((exponentSize % 8) != 0
+            || exponentSize < GnuDHKeyPairGenerator.DEFAULT_EXPONENT_SIZE)
+          throw new InvalidParameterException("Random exponent size (in bits) "
+                                              + "MUST be a multiple of 8, and "
+                                              + "greater than or equal to "
+                                              + GnuDHKeyPairGenerator.DEFAULT_EXPONENT_SIZE);
+        if (exponentSize > modulusSize)
+          throw new InvalidParameterException("Random exponent size (in bits) "
+                                              + "MUST be less than that of the "
+                                              + "public prime modulus (p)");
+      }
+
+    throw new InvalidAlgorithmParameterException("Wrong AlgorithmParameterSpec type: "
+                                                 + spec.getClass().getName());
+  }
+
+  protected AlgorithmParameters engineGenerateParameters()
+  {
+    if (modulusSize < 1)
+      modulusSize = GnuDHKeyPairGenerator.DEFAULT_PRIME_SIZE;
+
+    if (exponentSize < 1)
+      exponentSize = GnuDHKeyPairGenerator.DEFAULT_EXPONENT_SIZE;
+
+    rfc2631 = new RFC2631(exponentSize, modulusSize, rnd);
+    BigInteger[] params = rfc2631.generateParameters();
+    BigInteger p = params[RFC2631.DH_PARAMS_P];
+    BigInteger g = params[RFC2631.DH_PARAMS_G];
+    int l = params[RFC2631.DH_PARAMS_Q].bitLength();
+    DHParameterSpec spec = new DHParameterSpec(p, g, l);
+    AlgorithmParameters result = null;
+    try
+      {
+        result = AlgorithmParameters.getInstance(Registry.DH_KPG, GNU_CRYPTO);
+        result.init(spec);
+      }
+    catch (NoSuchAlgorithmException ignore)
+      {
+      }
+    catch (InvalidParameterSpecException ignore)
+      {
+      }
+    return result;
+  }
+}