248 lines
7 KiB
Java
248 lines
7 KiB
Java
/* ServerDHParams.java -- The server's Diffie-Hellman parameters.
|
|
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;
|
|
import java.nio.ByteOrder;
|
|
|
|
/**
|
|
* The server's Diffie-Hellman parameters message.
|
|
*
|
|
* <pre>
|
|
struct
|
|
{
|
|
opaque dh_p<1..2^16-1>;
|
|
opaque dh_g<1..2^16-1>;
|
|
opaque dh_Ys<1..2^16-1>;
|
|
} ServerDHParams;
|
|
</pre>
|
|
*/
|
|
public class ServerDHParams implements Builder, ServerKeyExchangeParams
|
|
{
|
|
private final ByteBuffer buffer;
|
|
|
|
public ServerDHParams (final ByteBuffer buffer)
|
|
{
|
|
this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
|
|
}
|
|
|
|
public ServerDHParams (final BigInteger p, final BigInteger g,
|
|
final BigInteger y)
|
|
{
|
|
byte[] p_bytes = p.toByteArray();
|
|
byte[] g_bytes = g.toByteArray();
|
|
byte[] y_bytes = y.toByteArray();
|
|
int len = p_bytes.length + g_bytes.length + y_bytes.length + 6;
|
|
|
|
int p_off = 0;
|
|
if (p_bytes[0] == 0x00)
|
|
{
|
|
p_off = 1;
|
|
len--;
|
|
}
|
|
int g_off = 0;
|
|
if (g_bytes[0] == 0x00)
|
|
{
|
|
g_off = 1;
|
|
len--;
|
|
}
|
|
int y_off = 0;
|
|
if (y_bytes[0] == 0x00)
|
|
{
|
|
y_off = 1;
|
|
len--;
|
|
}
|
|
int p_len = p_bytes.length - p_off;
|
|
int g_len = g_bytes.length - g_off;
|
|
int y_len = y_bytes.length - y_off;
|
|
|
|
buffer = ByteBuffer.allocate(len);
|
|
buffer.putShort((short) p_len);
|
|
buffer.put(p_bytes, p_off, p_len);
|
|
buffer.putShort((short) g_len);
|
|
buffer.put(g_bytes, g_off, g_len);
|
|
buffer.putShort((short) y_len);
|
|
buffer.put(y_bytes, y_off, y_len);
|
|
}
|
|
|
|
@Deprecated public KeyExchangeAlgorithm algorithm ()
|
|
{
|
|
return null; // XXX can't support this.
|
|
}
|
|
|
|
public int length ()
|
|
{
|
|
int offset1 = buffer.getShort (0) & 0xFFFF;
|
|
int offset2 = buffer.getShort (offset1 + 2) & 0xFFFF;
|
|
return ((buffer.getShort (offset1 + offset2 + 4) & 0xFFFF)
|
|
+ offset1 + offset2 + 6);
|
|
}
|
|
|
|
public ByteBuffer buffer()
|
|
{
|
|
return (ByteBuffer) buffer.duplicate().position(0).limit(length());
|
|
}
|
|
|
|
/**
|
|
* Returns the server's prime modulus.
|
|
*
|
|
* @return p.
|
|
*/
|
|
public BigInteger p ()
|
|
{
|
|
int len = buffer.getShort (0) & 0xFFFF;
|
|
byte[] buf = new byte[len];
|
|
buffer.position (2);
|
|
buffer.get (buf);
|
|
return new BigInteger (1, buf);
|
|
}
|
|
|
|
/**
|
|
* Returns the server's generator value.
|
|
*
|
|
* @return g.
|
|
*/
|
|
public BigInteger g ()
|
|
{
|
|
int off = (buffer.getShort (0) & 0xFFFF) + 2;
|
|
int len = buffer.getShort (off) & 0xFFFF;
|
|
byte[] buf = new byte[len];
|
|
buffer.position (off + 2);
|
|
buffer.get (buf);
|
|
return new BigInteger (1, buf);
|
|
}
|
|
|
|
/**
|
|
* Returns the server's public value.
|
|
*
|
|
* @return Y.
|
|
*/
|
|
public BigInteger y ()
|
|
{
|
|
int offset1 = (buffer.getShort (0) & 0xFFFF) + 2;
|
|
int offset2 = (buffer.getShort (offset1) & 0xFFFF) + offset1 + 2;
|
|
int len = buffer.getShort (offset2) & 0xFFFF;
|
|
byte[] buf = new byte[len];
|
|
buffer.position (offset2 + 2);
|
|
buffer.get (buf);
|
|
return new BigInteger (1, buf);
|
|
}
|
|
|
|
/**
|
|
* Sets the server's prime modulus, p.
|
|
*
|
|
* @param p The p parameter.
|
|
* @throws java.nio.ReadOnlyBufferException If the underlying buffer
|
|
* is not writeable.
|
|
*/
|
|
public void setP (final BigInteger p)
|
|
{
|
|
byte[] buf = p.toByteArray ();
|
|
int length = (buf[0] == 0x00 ? buf.length - 1 : buf.length);
|
|
int offset = (buf[0] == 0x00 ? 1 : 0);
|
|
buffer.putShort (0, (short) length);
|
|
buffer.position (2);
|
|
buffer.put (buf, offset, length);
|
|
}
|
|
|
|
/**
|
|
* Sets the server's generator value, g.
|
|
*
|
|
* @param g The g parameter.
|
|
* @throws java.nio.ReadOnlyBufferException If the underlying buffer
|
|
* is not writeable.
|
|
*/
|
|
public void setG (final BigInteger g)
|
|
{
|
|
byte[] buf = g.toByteArray ();
|
|
int length = (buf[0] == 0x00 ? buf.length -1 : buf.length);
|
|
int offset = (buf[0] == 0x00 ? 1 : 0);
|
|
int where = (buffer.getShort (0) & 0xFFFF) + 2;
|
|
buffer.putShort (where, (short) length);
|
|
buffer.position (where + 2);
|
|
buffer.put (buf, offset, length);
|
|
}
|
|
|
|
/**
|
|
* Sets the server's public value, Y.
|
|
*
|
|
* @param y The Y parameter.
|
|
* @throws java.nio.ReadOnlyBufferException If the underlying buffer
|
|
* is not writeable.
|
|
*/
|
|
public void setY (final BigInteger y)
|
|
{
|
|
int offset1 = (buffer.getShort (0) & 0xFFFF) + 2;
|
|
int offset2 = (buffer.getShort (offset1) & 0xFFFF) + offset1 + 2;
|
|
byte[] buf = y.toByteArray ();
|
|
int length = (buf[0] == 0x00 ? buf.length -1 : buf.length);
|
|
int offset = (buf[0] == 0x00 ? 1 : 0);
|
|
buffer.putShort (offset2, (short) length);
|
|
buffer.position (offset2 + 2);
|
|
buffer.put (buf, offset, length);
|
|
}
|
|
|
|
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_p: ");
|
|
out.println (p ().toString (16));
|
|
if (prefix != null) out.print (prefix);
|
|
out.print (" dh_g: ");
|
|
out.println (g ().toString (16));
|
|
if (prefix != null) out.print (prefix);
|
|
out.print (" dh_Ys: ");
|
|
out.println (y ().toString (16));
|
|
if (prefix != null) out.print (prefix);
|
|
out.print ("} ServerDHParams;");
|
|
return str.toString ();
|
|
}
|
|
}
|