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jeremybenn |
/* PasswordEncryptedEntry.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.cipher.CipherFactory;
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import gnu.javax.crypto.cipher.IBlockCipher;
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import gnu.javax.crypto.mode.IMode;
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import gnu.javax.crypto.mode.ModeFactory;
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import gnu.javax.crypto.pad.IPad;
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import gnu.javax.crypto.pad.PadFactory;
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import gnu.javax.crypto.pad.WrongPaddingException;
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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.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 envelope that is encrypted with a password-derived key.
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*/
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public class PasswordEncryptedEntry
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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(PasswordEncryptedEntry.class.getName());
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public static final int TYPE = 1;
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public PasswordEncryptedEntry(String cipher, String mode, int keylen,
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Properties properties)
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{
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super(TYPE, properties);
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if ((cipher == null || cipher.length() == 0)
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|| (mode == null || mode.length() == 0))
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throw new IllegalArgumentException("cipher nor mode can be empty");
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this.properties.put("cipher", cipher);
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this.properties.put("mode", mode);
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this.properties.put("keylen", String.valueOf(keylen));
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setMasked(false);
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}
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private PasswordEncryptedEntry()
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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 PasswordEncryptedEntry decode(DataInputStream in,
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char[] password)
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throws IOException
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{
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PasswordEncryptedEntry entry = decode(in);
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try
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{
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entry.decrypt(password);
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}
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catch (WrongPaddingException wpe)
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{
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throw new MalformedKeyringException("wrong padding in decrypted data");
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}
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return entry;
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}
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public static PasswordEncryptedEntry decode(DataInputStream in)
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throws IOException
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{
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PasswordEncryptedEntry entry = new PasswordEncryptedEntry();
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entry.defaultDecode(in);
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return entry;
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}
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public void decrypt(char[] password) throws IllegalArgumentException,
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WrongPaddingException
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "decrypt");
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if (isMasked() && payload != null)
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{
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long tt = -System.currentTimeMillis();
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IMode mode = getMode(password, IMode.DECRYPTION);
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IPad padding = PadFactory.getInstance("PKCS7");
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padding.init(mode.currentBlockSize());
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byte[] buf = new byte[payload.length];
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int count = 0;
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while (count + mode.currentBlockSize() <= payload.length)
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{
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mode.update(payload, count, buf, count);
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count += mode.currentBlockSize();
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}
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int padlen = padding.unpad(buf, 0, buf.length);
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setMasked(false);
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int len = buf.length - padlen;
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ByteArrayInputStream baos = new ByteArrayInputStream(buf, 0, len);
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DataInputStream in = new DataInputStream(baos);
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try
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{
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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("decryption failed");
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}
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tt += System.currentTimeMillis();
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log.fine("Decrypted in " + tt + "ms.");
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}
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else if (Configuration.DEBUG)
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log.fine("Skip decryption; " + (isMasked() ? "null payload" : "unmasked"));
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if (Configuration.DEBUG)
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log.exiting(this.getClass().getName(), "decrypt");
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}
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public void encrypt(char[] password) throws IOException
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{
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if (Configuration.DEBUG)
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log.entering(this.getClass().getName(), "encrypt", String.valueOf(password));
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long tt = -System.currentTimeMillis();
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long t1 = -System.currentTimeMillis();
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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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IMode mode = getMode(password, IMode.ENCRYPTION);
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IPad pad = PadFactory.getInstance("PKCS7");
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pad.init(mode.currentBlockSize());
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ByteArrayOutputStream bout = new ByteArrayOutputStream(1024);
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DataOutputStream out2 = new DataOutputStream(bout);
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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 encode 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("-- Encoded an Entry in " + t1 + "ms.");
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}
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byte[] plaintext = bout.toByteArray();
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byte[] padding = pad.pad(plaintext, 0, plaintext.length);
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payload = new byte[plaintext.length + padding.length];
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byte[] lastBlock = new byte[mode.currentBlockSize()];
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int l = mode.currentBlockSize() - padding.length;
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System.arraycopy(plaintext, plaintext.length - l, lastBlock, 0, l);
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System.arraycopy(padding, 0, lastBlock, l, padding.length);
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int count = 0;
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while (count + mode.currentBlockSize() < plaintext.length)
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{
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mode.update(plaintext, count, payload, count);
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count += mode.currentBlockSize();
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}
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mode.update(lastBlock, 0, payload, count);
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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("Encrypted in " + tt + "ms.");
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log.exiting(this.getClass().getName(), "encrypt");
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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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encrypt(password);
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encode(out);
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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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{
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if (Configuration.DEBUG)
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log.fine("Null payload: " + this);
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throw new IllegalStateException("not encrypted");
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}
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}
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private IMode getMode(char[] password, int state)
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{
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String s = properties.get("salt");
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if (s == null)
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throw new IllegalArgumentException("no salt");
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byte[] salt = Util.toBytesFromString(s);
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IBlockCipher cipher = CipherFactory.getInstance(properties.get("cipher"));
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if (cipher == null)
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throw new IllegalArgumentException("no such cipher: "
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+ properties.get("cipher"));
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int blockSize = cipher.defaultBlockSize();
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if (properties.containsKey("block-size"))
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try
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{
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blockSize = Integer.parseInt(properties.get("block-size"));
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}
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catch (NumberFormatException nfe)
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{
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throw new IllegalArgumentException("bad block size: "
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+ nfe.getMessage());
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}
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String modeName = properties.get("mode");
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IMode mode = ModeFactory.getInstance(modeName, cipher, blockSize);
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if (mode == null)
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throw new IllegalArgumentException("no such mode: " + modeName);
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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 = 0;
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if (! properties.containsKey("keylen"))
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throw new IllegalArgumentException("no key length");
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try
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{
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keylen = Integer.parseInt(properties.get("keylen"));
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}
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catch (NumberFormatException nfe)
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{
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}
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byte[] dk = new byte[keylen];
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byte[] iv = new byte[blockSize];
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try
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{
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kdf.nextBytes(dk, 0, keylen);
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kdf.nextBytes(iv, 0, blockSize);
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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 modeAttr = new HashMap();
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modeAttr.put(IMode.KEY_MATERIAL, dk);
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modeAttr.put(IMode.STATE, Integer.valueOf(state));
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modeAttr.put(IMode.IV, iv);
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try
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{
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mode.init(modeAttr);
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}
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catch (InvalidKeyException ike)
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{
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throw new IllegalArgumentException(ike.toString());
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}
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return mode;
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}
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}
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