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/* ClientKeyExchange.java -- SSL ClientKeyExchange 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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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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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.BufferedReader;
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import java.io.DataInputStream;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.math.BigInteger;
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import java.security.PublicKey;
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import java.security.interfaces.RSAKey;
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import javax.crypto.interfaces.DHPublicKey;
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final class ClientKeyExchange implements Handshake.Body
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// -------------------------------------------------------------------------
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private final Object exObject;
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// -------------------------------------------------------------------------
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ClientKeyExchange(byte[] encryptedSecret)
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exObject = encryptedSecret;
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ClientKeyExchange(BigInteger bigint)
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// -------------------------------------------------------------------------
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static ClientKeyExchange read(InputStream in, CipherSuite suite,
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DataInputStream din = new DataInputStream(in);
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if (suite.getKeyExchange().equals("RSA"))
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if (suite.getVersion() == ProtocolVersion.SSL_3)
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len = (((RSAKey) key).getModulus().bitLength()+7) / 8;
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len = din.readUnsignedShort();
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byte[] buf = new byte[len];
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return new ClientKeyExchange(buf);
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else if (suite.getKeyExchange().equals("SRP"))
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byte[] buf = new byte[din.readUnsignedShort()];
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return new ClientKeyExchange(new BigInteger(1, buf));
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else if (key == null || !(key instanceof DHPublicKey)) // explicit.
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byte[] buf = new byte[din.readUnsignedShort()];
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return new ClientKeyExchange(new BigInteger(1, buf));
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return new ClientKeyExchange(new byte[0]);
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// -------------------------------------------------------------------------
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public void write(OutputStream out) throws IOException
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throw new UnsupportedOperationException("use write(java.io.OutputStream,ProtocolVersion) instead");
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public void write(OutputStream out, ProtocolVersion version) throws IOException
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if (exObject instanceof byte[])
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byte[] b = (byte[]) exObject;
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if (version != ProtocolVersion.SSL_3)
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out.write(b.length >>> 8 & 0xFF);
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out.write(b.length & 0xFF);
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byte[] bigint = ((BigInteger) exObject).toByteArray();
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if (bigint[0] == 0x00)
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out.write(bigint.length - 1 >>> 8 & 0xFF);
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out.write(bigint.length - 1 & 0xFF);
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out.write(bigint, 1, bigint.length - 1);
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out.write(bigint.length >>> 8 & 0xFF);
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out.write(bigint.length & 0xFF);
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Object getExchangeObject()
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public String toString()
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StringWriter str = new StringWriter();
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PrintWriter out = new PrintWriter(str);
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out.println("struct {");
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if (exObject instanceof byte[] && ((byte[]) exObject).length > 0)
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out.println(" encryptedPreMasterSecret =");
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out.print(Util.hexDump((byte[]) exObject, " "));
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else if (exObject instanceof BigInteger)
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out.println(" clientPublic = " + ((BigInteger) exObject).toString(16) + ";");
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out.println("} ClientKeyExchange;");
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return str.toString();