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jeremybenn |
/* AuthenticatedEntry.java --
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Copyright (C) 2003, 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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USA
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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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combination.
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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.crypto.keyring;
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import gnu.java.security.Registry;
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import gnu.javax.crypto.mac.IMac;
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import gnu.javax.crypto.mac.MacFactory;
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import gnu.javax.crypto.mac.MacOutputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.security.InvalidKeyException;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Iterator;
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public final class AuthenticatedEntry
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extends MaskableEnvelopeEntry
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implements Registry
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{
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public static final int TYPE = 2;
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public AuthenticatedEntry(String mac, int macLen, Properties properties)
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{
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super(TYPE, properties);
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if (macLen <= 0)
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throw new IllegalArgumentException("invalid mac length");
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this.properties.put("mac", mac);
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this.properties.put("maclen", String.valueOf(macLen));
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setMasked(false);
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}
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private AuthenticatedEntry()
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{
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super(TYPE);
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setMasked(true);
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}
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public static AuthenticatedEntry decode(DataInputStream in)
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throws IOException
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{
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AuthenticatedEntry entry = new AuthenticatedEntry();
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entry.properties.decode(in);
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if (! entry.properties.containsKey("mac"))
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throw new MalformedKeyringException("no mac specified");
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if (! entry.properties.containsKey("maclen"))
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throw new MalformedKeyringException("no mac length specified");
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return entry;
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}
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/**
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* Computes the mac over this envelope's data. This method <b>must</b> be
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* called before this entry in encoded.
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*
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* @param key The key to authenticate with.
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* @throws IOException If encoding fails.
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* @throws InvalidKeyException If the supplied key is bad.
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*/
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public void authenticate(byte[] key) throws IOException, InvalidKeyException
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{
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if (isMasked())
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throw new IllegalStateException("entry is masked");
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IMac m = getMac(key);
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ByteArrayOutputStream bout = new ByteArrayOutputStream(1024);
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MacOutputStream macout = new MacOutputStream(bout, m);
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DataOutputStream out2 = new DataOutputStream(macout);
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for (Iterator it = entries.iterator(); it.hasNext();)
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{
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Entry entry = (Entry) it.next();
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entry.encode(out2);
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}
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bout.write(m.digest());
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payload = bout.toByteArray();
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}
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/**
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* Verifies this entry's payload. This method will unmask this entry, thus it
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* must be called before accessing its contents.
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*
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* @param key The key to use to authenticate.
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* @throws InvalidKeyException If the given key is improper.
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*/
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public void verify(byte[] key) throws InvalidKeyException
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{
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if (! isMasked() || payload == null)
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return;
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IMac m = getMac(key);
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m.update(payload, 0, payload.length - m.macSize());
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byte[] macValue = new byte[m.macSize()];
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System.arraycopy(payload, payload.length - macValue.length, macValue, 0,
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macValue.length);
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if (! Arrays.equals(macValue, m.digest()))
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throw new IllegalArgumentException("MAC verification failed");
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try
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{
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int len = payload.length - m.macSize();
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ByteArrayInputStream bais = new ByteArrayInputStream(payload, 0, len);
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DataInputStream in = new DataInputStream(bais);
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decodeEnvelope(in);
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}
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catch (IOException ioe)
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{
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throw new IllegalArgumentException("malformed keyring fragment");
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}
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setMasked(false);
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payload = null;
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}
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protected void encodePayload() throws IOException
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{
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if (payload == null)
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throw new IllegalStateException("not authenticated");
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}
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private IMac getMac(byte[] key) throws InvalidKeyException
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{
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IMac mac = MacFactory.getInstance(properties.get("mac"));
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if (mac == null)
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throw new IllegalArgumentException("no such mac: " + properties.get("mac"));
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int maclen = 0;
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if (! properties.containsKey("maclen"))
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throw new IllegalArgumentException("no MAC length");
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try
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{
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maclen = Integer.parseInt(properties.get("maclen"));
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}
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catch (NumberFormatException nfe)
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{
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throw new IllegalArgumentException("bad MAC length");
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}
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HashMap macAttr = new HashMap();
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macAttr.put(IMac.MAC_KEY_MATERIAL, key);
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macAttr.put(IMac.TRUNCATED_SIZE, Integer.valueOf(maclen));
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mac.init(macAttr);
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return mac;
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}
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}
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