mirror of git://gcc.gnu.org/git/gcc.git
130 lines
3.8 KiB
Java
130 lines
3.8 KiB
Java
/* ClientDiffieHellmanPublic.java -- Client Diffie-Hellman value.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.net.ssl.provider;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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/**
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* The client's explicit Diffie Hellman value.
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*
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* <pre>
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struct {
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select (PublicValueEncoding) {
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case implicit: struct { };
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case explicit: opaque dh_Yc<1..2^16-1>;
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} dh_public;
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} ClientDiffieHellmanPublic;</pre>
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*/
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public class ClientDiffieHellmanPublic extends ExchangeKeys implements Builder
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{
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public ClientDiffieHellmanPublic(final ByteBuffer buffer)
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{
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super(buffer);
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}
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public ClientDiffieHellmanPublic(final BigInteger Yc)
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{
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super(wrap(Yc));
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}
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private static ByteBuffer wrap(BigInteger Yc)
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{
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byte[] b = Util.trim(Yc);
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ByteBuffer ret = ByteBuffer.allocate(b.length + 2);
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ret.putShort((short) b.length);
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ret.put(b);
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return (ByteBuffer) ret.rewind();
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}
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public ByteBuffer buffer()
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{
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return (ByteBuffer) buffer.duplicate().rewind().limit(length());
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}
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public BigInteger publicValue()
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{
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int len = length() - 2;
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byte[] b = new byte[len];
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buffer.position(2);
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buffer.get(b);
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buffer.rewind();
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return new BigInteger(1, b);
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}
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public void setPublicValue(final BigInteger Yc)
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{
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byte[] buf = Util.trim(Yc);
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if (buffer.capacity() < buf.length + 2)
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buffer = ByteBuffer.allocate(buf.length + 2);
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buffer.putShort((short) buf.length);
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buffer.put(buf);
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buffer.rewind();
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}
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public int length ()
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{
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return (buffer.getShort(0) & 0xFFFF) + 2;
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}
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public String toString ()
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{
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return toString (null);
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}
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public String toString (final String prefix)
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{
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StringWriter str = new StringWriter ();
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PrintWriter out = new PrintWriter (str);
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if (prefix != null) out.print (prefix);
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out.println ("struct {");
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if (prefix != null) out.print (prefix);
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out.print (" dh_Yc = ");
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out.print (publicValue ().toString (16));
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out.println (';');
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if (prefix != null) out.print (prefix);
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out.print ("} ClientDiffieHellmanPublic;");
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return str.toString ();
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}
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}
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