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+/* ClientDiffieHellmanPublic.java -- Client Diffie-Hellman value.
+ Copyright (C) 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.net.ssl.provider;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import java.math.BigInteger;
+
+import java.nio.ByteBuffer;
+
+/**
+ * The client's explicit Diffie Hellman value.
+ *
+ * <pre>
+struct {
+ select (PublicValueEncoding) {
+ case implicit: struct { };
+ case explicit: opaque dh_Yc&lt;1..2^16-1&gt;;
+ } dh_public;
+} ClientDiffieHellmanPublic;</pre>
+ */
+public class ClientDiffieHellmanPublic extends ExchangeKeys implements Builder
+{
+ public ClientDiffieHellmanPublic(final ByteBuffer buffer)
+ {
+ super(buffer);
+ }
+
+ public ClientDiffieHellmanPublic(final BigInteger Yc)
+ {
+ super(wrap(Yc));
+ }
+
+ private static ByteBuffer wrap(BigInteger Yc)
+ {
+ byte[] b = Util.trim(Yc);
+ ByteBuffer ret = ByteBuffer.allocate(b.length + 2);
+ ret.putShort((short) b.length);
+ ret.put(b);
+ return (ByteBuffer) ret.rewind();
+ }
+
+ public ByteBuffer buffer()
+ {
+ return (ByteBuffer) buffer.duplicate().rewind().limit(length());
+ }
+
+ public BigInteger publicValue()
+ {
+ int len = length() - 2;
+ byte[] b = new byte[len];
+ buffer.position(2);
+ buffer.get(b);
+ buffer.rewind();
+ return new BigInteger(1, b);
+ }
+
+ public void setPublicValue(final BigInteger Yc)
+ {
+ byte[] buf = Util.trim(Yc);
+ if (buffer.capacity() < buf.length + 2)
+ buffer = ByteBuffer.allocate(buf.length + 2);
+ buffer.putShort((short) buf.length);
+ buffer.put(buf);
+ buffer.rewind();
+ }
+
+ public int length ()
+ {
+ return (buffer.getShort(0) & 0xFFFF) + 2;
+ }
+
+ public String toString ()
+ {
+ return toString (null);
+ }
+
+ public String toString (final String prefix)
+ {
+ StringWriter str = new StringWriter ();
+ PrintWriter out = new PrintWriter (str);
+ if (prefix != null) out.print (prefix);
+ out.println ("struct {");
+ if (prefix != null) out.print (prefix);
+ out.print (" dh_Yc = ");
+ out.print (publicValue ().toString (16));
+ out.println (';');
+ if (prefix != null) out.print (prefix);
+ out.print ("} ClientDiffieHellmanPublic;");
+ return str.toString ();
+ }
+}