/* ServerKeyExchange.java -- SSL ServerKeyExchange message.
Copyright (C) 2003 Casey Marshall <rsdio@metastatic.org>
This file is a part of Jessie.
Jessie 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.
Jessie 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 Jessie; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place, Suite 330,
Boston, MA 02111-1307
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 org.metastatic.jessie.provider;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.math.BigInteger;
import java.security.PublicKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import javax.net.ssl.SSLProtocolException;
import gnu.crypto.key.dh.GnuDHPublicKey;
import gnu.crypto.key.srp6.SRPPublicKey;
class ServerKeyExchange implements Handshake.Body
{
// Fields.
// -------------------------------------------------------------------------
private PublicKey publicKey;
private Signature signature;
private byte[] srpSalt;
// Constructor.
// -------------------------------------------------------------------------
ServerKeyExchange(PublicKey publicKey, Signature signature)
{
this(publicKey, signature, null);
}
ServerKeyExchange(PublicKey publicKey, Signature signature, byte[] srpSalt)
{
this.publicKey = publicKey;
this.signature = signature;
this.srpSalt = srpSalt;
}
// Class methods.
// -------------------------------------------------------------------------
static ServerKeyExchange read(InputStream in, CipherSuite suite,
PublicKey serverKey)
throws IOException
{
DataInputStream din = new DataInputStream(in);
PublicKey key = null;
byte[] salt = null;
String kex = suite.getKeyExchange();
if (kex.equals("DHE"))
{
BigInteger p, g, y;
byte[] buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
p = new BigInteger(1, buf);
buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
g = new BigInteger(1, buf);
buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
y = new BigInteger(1, buf);
key = new GnuDHPublicKey(null, p, g, y);
}
else if (kex.equals("RSA"))
{
BigInteger n, e;
byte[] buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
n = new BigInteger(1, buf);
buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
e = new BigInteger(1, buf);
key = new JessieRSAPublicKey(n, e);
}
else if (kex.equals("SRP"))
{
BigInteger N, g, B;
byte[] buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
N = new BigInteger(1, buf);
buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
g = new BigInteger(1, buf);
salt = new byte[din.readUnsignedByte()];
din.readFully(salt);
buf = new byte[din.readUnsignedShort()];
din.readFully(buf);
B = new BigInteger(1, buf);
try
{
key = new SRPPublicKey(N, g, B);
}
catch (IllegalArgumentException iae)
{
throw new SSLProtocolException(iae.getMessage());
}
}
else
{
throw new SSLProtocolException("invalid kex algorithm");
}
Signature sig = null;
if (!suite.getSignature().equals("anon"))
{
sig = Signature.read(in, suite, serverKey);
}
return new ServerKeyExchange(key, sig, salt);
}
// Instance methods.
// -------------------------------------------------------------------------
public void write(OutputStream out) throws IOException
{
write(out, ProtocolVersion.TLS_1);
}
public void write(OutputStream out, ProtocolVersion version)
throws IOException
{
if (publicKey instanceof DHPublicKey)
{
writeBigint(out, ((DHPublicKey) publicKey).getParams().getP());
writeBigint(out, ((DHPublicKey) publicKey).getParams().getG());
writeBigint(out, ((DHPublicKey) publicKey).getY());
}
else if (publicKey instanceof RSAPublicKey)
{
writeBigint(out, ((RSAPublicKey) publicKey).getModulus());
writeBigint(out, ((RSAPublicKey) publicKey).getPublicExponent());
}
else if (publicKey instanceof SRPPublicKey)
{
writeBigint(out, ((SRPPublicKey) publicKey).getN());
writeBigint(out, ((SRPPublicKey) publicKey).getG());
out.write(srpSalt.length);
out.write(srpSalt);
writeBigint(out, ((SRPPublicKey) publicKey).getY());
}
if (signature != null)
{
signature.write(out, version);
}
}
PublicKey getPublicKey()
{
return publicKey;
}
Signature getSignature()
{
return signature;
}
byte[] getSRPSalt()
{
return srpSalt;
}
public String toString()
{
StringWriter str = new StringWriter();
PrintWriter out = new PrintWriter(str);
out.println("struct {");
out.println(" publicKey = struct {");
if (publicKey instanceof DHPublicKey)
{
out.println(" p = " +
((DHPublicKey) publicKey).getParams().getP().toString(16) +
";");
out.println(" g = " +
((DHPublicKey) publicKey).getParams().getG().toString(16) +
";");
out.println(" y = " + ((DHPublicKey) publicKey).getY().toString(16) +
";");
out.println(" } DHPublicKey;");
}
else if (publicKey instanceof RSAPublicKey)
{
out.println(" modulus = " +
((RSAPublicKey) publicKey).getModulus().toString(16) +
";");
out.println(" exponent = " +
((RSAPublicKey) publicKey).getPublicExponent().toString(16) +
";");
out.println(" } RSAPublicKey;");
}
else if (publicKey instanceof SRPPublicKey)
{
out.println(" N = "+((SRPPublicKey) publicKey).getN().toString(16)+";");
out.println(" g = "+((SRPPublicKey) publicKey).getG().toString(16)+";");
out.println(" salt = " + Util.toHexString(srpSalt, ':') + ";");
out.println(" B = "+((SRPPublicKey) publicKey).getY().toString(16)+";");
out.println(" } SRPPublicKey;");
}
if (signature != null)
{
out.println(" signature =");
BufferedReader r = new BufferedReader(new StringReader(signature.toString()));
String s;
try
{
while ((s = r.readLine()) != null)
{
out.print(" ");
out.println(s);
}
}
catch (IOException ignored)
{
}
}
out.println("} ServerKeyExchange;");
return str.toString();
}
private void writeBigint(OutputStream out, BigInteger bigint)
throws IOException
{
byte[] b = bigint.toByteArray();
if (b[0] == 0x00)
{
out.write((b.length - 1) >>> 8 & 0xFF);
out.write((b.length - 1) & 0xFF);
out.write(b, 1, b.length - 1);
}
else
{
out.write(b.length >>> 8 & 0xFF);
out.write(b.length & 0xFF);
out.write(b);
}
}
}
