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jeremybenn |
/* ServerKeyExchange.java -- SSL ServerKeyExchange message.
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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.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* The server key exchange message.
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*
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* <pre>
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struct
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{
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select (KeyExchangeAlgorithm)
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{
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case diffie_hellman:
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ServerDHParams params;
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Signature signed_params;
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case rsa:
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ServerRSAParams params;
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Signature signed_params;
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case srp:
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ServerSRPParams params;
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Signature signed_params;
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};
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} ServerKeyExchange;
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</pre>
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*/
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public class ServerKeyExchange implements Handshake.Body
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{
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protected ByteBuffer buffer;
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protected final CipherSuite suite;
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public ServerKeyExchange(final ByteBuffer buffer, final CipherSuite suite)
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{
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suite.getClass();
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this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
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this.suite = suite;
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}
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public int length ()
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{
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if (suite.keyExchangeAlgorithm ().equals (KeyExchangeAlgorithm.NONE))
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return 0;
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int len = 0;
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ServerKeyExchangeParams params = params();
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Signature sig = signature();
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if (params != null)
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len += params.length();
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if (sig != null)
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len += sig.length();
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return len;
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}
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/**
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* Returns the server's key exchange parameters. The value returned will
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* depend on the key exchange algorithm this object was created with.
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*
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* @return The server's key exchange parameters.
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*/
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public ServerKeyExchangeParams params ()
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{
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KeyExchangeAlgorithm kex = suite.keyExchangeAlgorithm ();
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if (kex == KeyExchangeAlgorithm.RSA)
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return new ServerRSAParams(buffer.duplicate ());
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else if (kex == KeyExchangeAlgorithm.DHE_DSS
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|| kex == KeyExchangeAlgorithm.DHE_RSA
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|| kex == KeyExchangeAlgorithm.DH_anon)
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return new ServerDHParams(buffer.duplicate());
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// else if (kex.equals (KeyExchangeAlgorithm.SRP))
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// return new ServerSRPParams (buffer.duplicate ());
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else if (kex == KeyExchangeAlgorithm.NONE)
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return null;
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else if (kex == KeyExchangeAlgorithm.DHE_PSK)
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return new ServerDHE_PSKParameters(buffer.duplicate());
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else if (kex == KeyExchangeAlgorithm.PSK)
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return new ServerPSKParameters(buffer.duplicate());
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else if (kex == KeyExchangeAlgorithm.RSA_PSK)
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return new ServerPSKParameters(buffer.duplicate());
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throw new IllegalArgumentException ("unsupported key exchange: " + kex);
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}
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/**
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* Returns the digital signature made over the key exchange parameters.
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*
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* @return The signature.
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*/
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public Signature signature ()
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{
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KeyExchangeAlgorithm kex = suite.keyExchangeAlgorithm();
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if (kex == KeyExchangeAlgorithm.NONE
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|| kex == KeyExchangeAlgorithm.DH_anon
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|| kex == KeyExchangeAlgorithm.DHE_PSK
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|| kex == KeyExchangeAlgorithm.PSK
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|| kex == KeyExchangeAlgorithm.RSA_PSK)
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return null;
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ServerKeyExchangeParams params = params();
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ByteBuffer sigbuf = ((ByteBuffer) buffer.position(params.length ())).slice ();
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return new Signature (sigbuf, suite.signatureAlgorithm ());
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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 (" algorithm: ");
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out.print (suite.keyExchangeAlgorithm ());
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out.println (";");
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if (!suite.keyExchangeAlgorithm ().equals (KeyExchangeAlgorithm.NONE))
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{
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if (prefix != null) out.print (prefix);
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out.println (" parameters:");
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out.println (params ().toString (prefix != null ? prefix+" " : " "));
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}
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if (!suite.signatureAlgorithm ().equals (SignatureAlgorithm.ANONYMOUS))
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{
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if (prefix != null) out.print (prefix);
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out.println (" signature:");
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out.println (signature ().toString (prefix != null ? prefix+" " : " "));
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}
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if (prefix != null) out.print (prefix);
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out.print ("} ServerKeyExchange;");
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return str.toString();
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}
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}
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