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jeremybenn |
/* PasswordAuthenticatedEntry.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.Configuration;
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import gnu.java.security.Registry;
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import gnu.java.security.prng.IRandom;
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import gnu.java.security.prng.LimitReachedException;
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import gnu.java.security.util.PRNG;
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import gnu.java.security.util.Util;
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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.MacInputStream;
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import gnu.javax.crypto.mac.MacOutputStream;
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import gnu.javax.crypto.prng.IPBE;
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import gnu.javax.crypto.prng.PRNGFactory;
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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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import java.util.logging.Logger;
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/**
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* An entry authenticated with a password-based MAC.
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*/
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public final class PasswordAuthenticatedEntry
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extends MaskableEnvelopeEntry
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implements PasswordProtectedEntry, Registry
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{
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private static final Logger log = Logger.getLogger(PasswordAuthenticatedEntry.class.getName());
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public static final int TYPE = 3;
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public PasswordAuthenticatedEntry(String mac, int maclen,
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Properties properties)
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{
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super(TYPE, properties);
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if (mac == null || mac.length() == 0)
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throw new IllegalArgumentException("no MAC specified");
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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 PasswordAuthenticatedEntry()
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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 PasswordAuthenticatedEntry decode(DataInputStream in,
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char[] password)
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throws IOException
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{
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PasswordAuthenticatedEntry entry = new PasswordAuthenticatedEntry();
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entry.properties.decode(in);
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IMac mac = entry.getMac(password);
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int len = in.readInt() - mac.macSize();
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MeteredInputStream min = new MeteredInputStream(in, len);
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MacInputStream macin = new MacInputStream(min, mac);
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DataInputStream in2 = new DataInputStream(macin);
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entry.setMasked(false);
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entry.decodeEnvelope(in2);
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byte[] macValue = new byte[mac.macSize()];
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in.readFully(macValue);
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if (! Arrays.equals(macValue, mac.digest()))
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throw new MalformedKeyringException("MAC verification failed");
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return entry;
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}
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public static PasswordAuthenticatedEntry decode(DataInputStream in)
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throws IOException
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{
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PasswordAuthenticatedEntry entry = new PasswordAuthenticatedEntry();
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entry.defaultDecode(in);
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if (! entry.properties.containsKey("mac"))
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throw new MalformedKeyringException("no MAC");
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if (! entry.properties.containsKey("maclen"))
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throw new MalformedKeyringException("no MAC length");
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if (! entry.properties.containsKey("salt"))
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throw new MalformedKeyringException("no salt");
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return entry;
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}
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public void verify(char[] password)
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "verify");
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if (isMasked() && payload != null)
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{
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if (Configuration.DEBUG)
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log.fine("payload to verify: " + Util.dumpString(payload));
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long tt = -System.currentTimeMillis();
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IMac m = null;
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try
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{
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m = getMac(password);
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}
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catch (Exception x)
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{
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throw new IllegalArgumentException(x.toString(), x);
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}
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int limit = payload.length - m.macSize();
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m.update(payload, 0, limit);
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byte[] macValue = new byte[m.macSize()];
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System.arraycopy(payload, payload.length - macValue.length, macValue,
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0, 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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setMasked(false);
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ByteArrayInputStream bais;
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try
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{
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bais = new ByteArrayInputStream(payload, 0, limit);
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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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tt += System.currentTimeMillis();
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if (Configuration.DEBUG)
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log.fine("Verified in " + tt + "ms.");
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}
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else if (Configuration.DEBUG)
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log.fine("Skip verification; "
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+ (isMasked() ? "null payload" : "unmasked"));
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if (Configuration.DEBUG)
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log.exiting(this.getClass().getName(), "verify");
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}
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public void authenticate(char[] password) throws IOException
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "authenticate");
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long tt = -System.currentTimeMillis();
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long t1 = -System.currentTimeMillis();
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if (isMasked())
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throw new IllegalStateException("entry is masked");
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byte[] salt = new byte[8];
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PRNG.getInstance().nextBytes(salt);
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t1 += System.currentTimeMillis();
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if (Configuration.DEBUG)
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log.fine("-- Generated salt in " + t1 + "ms.");
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properties.put("salt", Util.toString(salt));
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IMac m = getMac(password);
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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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if (Configuration.DEBUG)
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log.fine("-- About to authenticate one " + entry);
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t1 = -System.currentTimeMillis();
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entry.encode(out2);
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t1 += System.currentTimeMillis();
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if (Configuration.DEBUG)
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log.fine("-- Authenticated an Entry in " + t1 + "ms.");
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}
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bout.write(m.digest());
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payload = bout.toByteArray();
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if (Configuration.DEBUG)
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log.fine("authenticated payload: " + Util.dumpString(payload));
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setMasked(true);
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tt += System.currentTimeMillis();
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if (Configuration.DEBUG)
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{
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log.fine("Authenticated in " + tt + "ms.");
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log.exiting(this.getClass().getName(), "authenticate");
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}
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}
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public void encode(DataOutputStream out, char[] password) throws IOException
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{
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authenticate(password);
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encode(out);
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}
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protected void encodePayload(DataOutputStream out) throws IOException
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{
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if (payload == null)
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{
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log.fine("Null payload: " + this);
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throw new IllegalStateException("mac not computed");
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}
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}
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private IMac getMac(char[] password) throws MalformedKeyringException
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "getMac");
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String saltString = properties.get("salt");
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if (saltString == null)
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throw new MalformedKeyringException("no salt");
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byte[] salt = Util.toBytesFromString(saltString);
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String macAlgorithm = properties.get("mac");
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IMac mac = MacFactory.getInstance(macAlgorithm);
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if (mac == null)
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throw new MalformedKeyringException("no such mac: " + macAlgorithm);
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String macLenString = properties.get("maclen");
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if (macLenString == null)
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throw new MalformedKeyringException("no MAC length");
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int maclen;
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try
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{
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maclen = Integer.parseInt(macLenString);
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}
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catch (NumberFormatException nfe)
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{
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throw new MalformedKeyringException("bad MAC length");
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}
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HashMap pbAttr = new HashMap();
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pbAttr.put(IPBE.PASSWORD, password);
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pbAttr.put(IPBE.SALT, salt);
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pbAttr.put(IPBE.ITERATION_COUNT, ITERATION_COUNT);
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IRandom kdf = PRNGFactory.getInstance("PBKDF2-HMAC-SHA");
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kdf.init(pbAttr);
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int keylen = mac.macSize();
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byte[] dk = new byte[keylen];
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try
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{
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kdf.nextBytes(dk, 0, keylen);
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}
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catch (LimitReachedException shouldNotHappen)
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{
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throw new Error(shouldNotHappen.toString());
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}
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HashMap macAttr = new HashMap();
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macAttr.put(IMac.MAC_KEY_MATERIAL, dk);
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macAttr.put(IMac.TRUNCATED_SIZE, Integer.valueOf(maclen));
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try
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{
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mac.init(macAttr);
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}
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catch (InvalidKeyException shouldNotHappen)
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{
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throw new Error(shouldNotHappen.toString());
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}
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if (Configuration.DEBUG)
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log.exiting(this.getClass().getName(), "getMac");
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return mac;
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}
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}
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