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+/* DHParameterSpec.java -- Parameters for Diffie-Hellman keys.
+   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 javax.crypto.spec;
+
+import java.math.BigInteger;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * The base set of parameters necessary to perform Diffie-Hellman key
+ * exchange. Each party in the key exchange shares these parameters.
+ *
+ * <p>Each set of parameters consists of a <i>base generator</i>
+ * <code>g</code>, a <i>prime modulus</i> <code>p</code>, and an
+ * optional length, in bits, of the private exponent.
+ *
+ * <p>See <a href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-3/">PKCS
+ * #3 - Diffie-Hellman Key Agreement Standard</a> for more information.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ * @see javax.crypto.KeyAgreement
+ */
+public class DHParameterSpec implements AlgorithmParameterSpec
+{
+
+  // Variables.
+  // ------------------------------------------------------------------------
+
+  /** The base generator g. */
+  private BigInteger g;
+
+  /** The prime modulus p. */
+  private BigInteger p;
+
+  /** The length, in bits, of the private exponent. */
+  private int l;
+
+  // Constructors.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new set of Diffie-Hellman parameters.
+   *
+   * @param p The prime modulus.
+   * @param g The base generator.
+   */
+  public DHParameterSpec(BigInteger p, BigInteger g)
+  {
+    this(p, g, 0);
+  }
+
+  /**
+   * Create a new set of Diffie-Hellman parameters.
+   *
+   * @param p The prime modulus.
+   * @param g The base generator.
+   * @param l The size of the private exponent, in bits.
+   */
+  public DHParameterSpec(BigInteger p, BigInteger g, int l)
+  {
+    this.p = p;
+    this.g = g;
+    this.l = l;
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Get the base generator, <i>g</i>.
+   *
+   * @return The base generator <i>g</i>.
+   */
+  public BigInteger getG()
+  {
+    return g;
+  }
+
+  /**
+   * Get the length of the private exponent, in bits.
+   *
+   * @return The length of the private exponent, in bits, or 0 if this
+   *         has not been explicitly set.
+   */
+  public int getL()
+  {
+    return l;
+  }
+
+  /**
+   * Get the prime modulus, <i>p</i>.
+   *
+   * @return The prime modulus, <i>p</i>.
+   */
+  public BigInteger getP()
+  {
+    return p;
+  }
+}