package gnu.crypto.keyring; // -*- c-basic-offset: 3 -*-
// ---------------------------------------------------------------------------
// $Id: PublicKeyEntry.java,v 1.6 2005/10/06 04:24:16 rsdio Exp $
//
// Copyright (C) 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto 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, or (at your option)
// any later version.
//
// GNU Crypto 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 this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 51 Franklin Street, 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.
//
// ---------------------------------------------------------------------------
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.security.PublicKey;
import java.security.KeyFactory;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;
import gnu.crypto.key.IKeyPairCodec;
import gnu.crypto.key.KeyPairCodecFactory;
import gnu.crypto.key.dh.GnuDHPublicKey;
import gnu.crypto.key.dss.DSSPublicKey;
import gnu.crypto.key.rsa.GnuRSAPublicKey;
public final class PublicKeyEntry extends PrimitiveEntry {
// Constants and fields.
// ------------------------------------------------------------------------
public static final int TYPE = 6;
private PublicKey key;
// Constructor.
// ------------------------------------------------------------------------
public PublicKeyEntry(PublicKey key, Date creationDate,
Properties properties)
{
super(TYPE, creationDate, properties);
if (key == null) {
throw new IllegalArgumentException("no key specified");
}
this.key = key;
}
private PublicKeyEntry()
{
super (TYPE);
}
// Class method.
// ------------------------------------------------------------------------
public static PublicKeyEntry decode(DataInputStream in)
throws IOException
{
PublicKeyEntry entry = new PublicKeyEntry();
entry.defaultDecode(in);
String type = entry.properties.get("type");
if (type == null) {
throw new MalformedKeyringException("no key type");
}
if (type.equalsIgnoreCase("RAW-DSS")) {
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("dss");
entry.key = coder.decodePublicKey(entry.payload);
} else if (type.equalsIgnoreCase("RAW-RSA")) {
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("rsa");
entry.key = coder.decodePublicKey(entry.payload);
} else if (type.equalsIgnoreCase("RAW-DH")) {
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("dh");
entry.key = coder.decodePublicKey(entry.payload);
} else if (type.equalsIgnoreCase("X.509")) {
try {
KeyFactory kf = KeyFactory.getInstance("RSA");
entry.key = kf.generatePublic(new X509EncodedKeySpec(entry.payload));
} catch (Exception x) {
}
if (entry.key == null) {
try {
KeyFactory kf = KeyFactory.getInstance("DSA");
entry.key = kf.generatePublic(new X509EncodedKeySpec(entry.payload));
} catch (Exception x) {
}
if (entry.key == null) {
throw new MalformedKeyringException("could not decode X.509 key");
}
}
} else {
throw new MalformedKeyringException("unsupported public key type: " + type);
}
return entry;
}
// Instance methods.
// ------------------------------------------------------------------------
/**
* Returns the public key.
*
* @return The public key.
*/
public PublicKey getKey() {
return key;
}
protected void encodePayload() throws IOException {
if (key instanceof DSSPublicKey) {
properties.put("type", "RAW-DSS");
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("dss");
payload = coder.encodePublicKey(key);
} else if (key instanceof GnuRSAPublicKey) {
properties.put("type", "RAW-RSA");
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("rsa");
payload = coder.encodePublicKey(key);
} else if (key instanceof GnuDHPublicKey) {
properties.put("type", "RAW-DH");
IKeyPairCodec coder = KeyPairCodecFactory.getInstance("dh");
payload = coder.encodePublicKey(key);
} else if (key.getFormat() != null && key.getFormat().equals("X.509")) {
properties.put("type", "X.509");
payload = key.getEncoded();
} else {
throw new IllegalArgumentException("cannot encode public key");
}
}
}