| /* ServerRSAParams.java -- The server's RSA 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; |
| |
| /** |
| * The ServerRSAParams structure. |
| * |
| * <pre> |
| struct |
| { |
| opaque rsa_modulus<1..2^16-1>; |
| opaque rsa_exponent<1..2^16-1>; |
| } ServerRSAParams; |
| </pre> |
| */ |
| public class ServerRSAParams implements ServerKeyExchangeParams |
| { |
| |
| private final ByteBuffer buffer; |
| |
| public ServerRSAParams (final ByteBuffer buffer) |
| { |
| this.buffer = buffer; |
| } |
| |
| public KeyExchangeAlgorithm algorithm () |
| { |
| return KeyExchangeAlgorithm.RSA; |
| } |
| |
| public int length () |
| { |
| int offset = buffer.getShort (0) & 0xFFFF; |
| return (buffer.getShort (offset + 2) & 0xFFFF) + offset + 4; |
| } |
| |
| /** |
| * Gets the modulus field. |
| * |
| * @return The modulus. |
| */ |
| public BigInteger modulus () |
| { |
| int len = buffer.getShort (0) & 0xFFFF; |
| byte[] buf = new byte[len]; |
| buffer.position (2); |
| buffer.get (buf); |
| return new BigInteger (1, buf); |
| } |
| |
| /** |
| * Returns the exponent field. |
| * |
| * @return The exponent. |
| */ |
| public BigInteger exponent () |
| { |
| 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); |
| } |
| |
| /** |
| * Sets the modulus. |
| * |
| * @param modulus The modulus. |
| * @throws java.nio.ReadOnlyBufferException If the underlying buffer |
| * is not writable. |
| */ |
| public void setModulus (final BigInteger modulus) |
| { |
| byte[] buf = modulus.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 exponent. |
| * |
| * @param exponent The exponent. |
| * @throws java.nio.ReadOnlyBufferException If the underlying buffer |
| * is not writeable. |
| */ |
| public void setExponent (final BigInteger exponent) |
| { |
| byte[] buf = exponent.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); |
| } |
| |
| 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 (" rsa_modulus: "); |
| out.println (modulus ().toString (16)); |
| if (prefix != null) out.print (prefix); |
| out.print (" rsa_exponent: "); |
| out.println (exponent ()); |
| if (prefix != null) out.print (prefix); |
| out.print ("} ServerRSAParams;"); |
| return str.toString (); |
| } |
| } |