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jeremybenn |
/* SecurityParameters.java -- SSL security parameters.
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Copyright (C) 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.net.ssl.provider;
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import gnu.classpath.debug.Component;
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import gnu.classpath.debug.SystemLogger;
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import gnu.java.security.util.ByteArray;
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import gnu.java.security.util.ByteBufferOutputStream;
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import java.nio.BufferOverflowException;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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import java.util.zip.DataFormatException;
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import java.util.zip.Inflater;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.Mac;
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import javax.crypto.ShortBufferException;
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import javax.net.ssl.SSLException;
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public class InputSecurityParameters
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{
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private static final SystemLogger logger = SystemLogger.SYSTEM;
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private final Cipher cipher;
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private final Mac mac;
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private final Inflater inflater;
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private SessionImpl session;
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private final CipherSuite suite;
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private long sequence;
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public InputSecurityParameters (final Cipher cipher, final Mac mac,
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final Inflater inflater,
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final SessionImpl session,
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final CipherSuite suite)
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{
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this.cipher = cipher;
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this.mac = mac;
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this.inflater = inflater;
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this.session = session;
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this.suite = suite;
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sequence = 0;
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}
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/**
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* Decrypt a record, storing the decrypted fragment into the given array
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* of byte buffers.
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*
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* @param record The input record.
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* @param output The output buffers.
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* @param offset The offset of the first buffer to use.
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* @param length The number of buffers to use.
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* @return The number of bytes put in the output buffers.
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* @throws DataFormatException If decompression fails.
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* @throws IllegalBlockSizeException If the current cipher is a block cipher,
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* and the input fragment is not a multiple of the block size.
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* @throws MacException If verifying the MAC fails.
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* @throws SSLException ???
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* @throws ShortBufferException
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*/
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public int decrypt(Record record, ByteBuffer[] output, int offset, int length)
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throws DataFormatException, IllegalBlockSizeException,
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MacException, SSLException, ShortBufferException
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{
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return decrypt(record, output, offset, length, null);
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}
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/**
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* Decrypt a record, storing the decrypted fragment into the given growable
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* buffer.
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*
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* @param record The input record.
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* @param outputStream The output buffer.
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* @return The number of bytes put into the output buffer.
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* @throws DataFormatException
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* @throws IllegalBlockSizeException
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* @throws MacException
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* @throws SSLException
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* @throws ShortBufferException
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*/
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public int decrypt(Record record, ByteBufferOutputStream outputStream)
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throws DataFormatException, IllegalBlockSizeException,
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MacException, SSLException, ShortBufferException
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{
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return decrypt(record, null, 0, 0, outputStream);
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}
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private int decrypt(Record record, ByteBuffer[] output, int offset, int length,
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ByteBufferOutputStream outputStream)
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throws DataFormatException, IllegalBlockSizeException,
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MacException, SSLException, ShortBufferException
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{
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boolean badPadding = false;
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ByteBuffer fragment;
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if (cipher != null)
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{
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ByteBuffer input = record.fragment();
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fragment = ByteBuffer.allocate(input.remaining());
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cipher.update(input, fragment);
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}
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else
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fragment = record.fragment();
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if (Debug.DEBUG_DECRYPTION)
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logger.logv(Component.SSL_RECORD_LAYER, "decrypted fragment:\n{0}",
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Util.hexDump((ByteBuffer) fragment.duplicate().position(0), " >> "));
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int fragmentLength = record.length();
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int maclen = 0;
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if (mac != null)
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maclen = mac.getMacLength();
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fragmentLength -= maclen;
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int padlen = 0;
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int padRemoveLen = 0;
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if (!suite.isStreamCipher ())
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{
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padlen = fragment.get(record.length() - 1) & 0xFF;
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padRemoveLen = padlen + 1;
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if (Debug.DEBUG)
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logger.logv(Component.SSL_RECORD_LAYER, "padlen:{0}", padlen);
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if (record.version() == ProtocolVersion.SSL_3)
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{
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// In SSLv3, the padding length must not be larger than
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// the cipher's block size.
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if (padlen > cipher.getBlockSize ())
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badPadding = true;
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}
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else if (record.version().compareTo(ProtocolVersion.TLS_1) >= 0)
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{
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// In TLSv1 and later, the padding must be `padlen' copies of the
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// value `padlen'.
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byte[] pad = new byte[padlen];
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((ByteBuffer) fragment.duplicate().position(record.length() - padlen - 1)).get(pad);
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for (int i = 0; i < pad.length; i++)
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if ((pad[i] & 0xFF) != padlen)
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badPadding = true;
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if (Debug.DEBUG)
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logger.logv(Component.SSL_RECORD_LAYER, "TLSv1.x padding\n{0}",
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new ByteArray(pad));
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}
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if (Debug.DEBUG)
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logger.logv(Component.SSL_RECORD_LAYER, "padding bad? {0}",
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badPadding);
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if (!badPadding)
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fragmentLength = fragmentLength - padRemoveLen;
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}
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int ivlen = 0;
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if (session.version.compareTo(ProtocolVersion.TLS_1_1) >= 0
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&& !suite.isStreamCipher())
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ivlen = cipher.getBlockSize();
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// Compute and check the MAC.
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if (mac != null)
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{
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mac.update((byte) (sequence >>> 56));
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mac.update((byte) (sequence >>> 48));
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mac.update((byte) (sequence >>> 40));
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mac.update((byte) (sequence >>> 32));
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mac.update((byte) (sequence >>> 24));
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mac.update((byte) (sequence >>> 16));
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mac.update((byte) (sequence >>> 8));
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mac.update((byte) sequence);
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mac.update((byte) record.getContentType().getValue());
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ProtocolVersion version = record.version();
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if (version != ProtocolVersion.SSL_3)
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{
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mac.update((byte) version.major());
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mac.update((byte) version.minor());
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}
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mac.update((byte) ((fragmentLength - ivlen) >>> 8));
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mac.update((byte) (fragmentLength - ivlen));
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ByteBuffer content =
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(ByteBuffer) fragment.duplicate().position(ivlen).limit(fragmentLength);
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mac.update(content);
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byte[] mac1 = mac.doFinal ();
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byte[] mac2 = new byte[maclen];
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mac.reset();
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((ByteBuffer) fragment.duplicate().position(fragmentLength)).get(mac2);
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if (Debug.DEBUG)
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logger.logv(Component.SSL_RECORD_LAYER, "mac1:{0} mac2:{1}",
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Util.toHexString(mac1, ':'), Util.toHexString(mac2, ':'));
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if (!Arrays.equals (mac1, mac2))
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badPadding = true;
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}
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// We always say "bad MAC" and not "bad padding," because saying
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// the latter will leak information to an attacker.
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if (badPadding)
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throw new MacException ();
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// Inflate the compressed bytes.
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int produced = 0;
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if (inflater != null)
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{
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ByteBufferOutputStream out = new ByteBufferOutputStream(fragmentLength);
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byte[] inbuffer = new byte[1024];
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byte[] outbuffer = new byte[1024];
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boolean done = false;
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if (record.version().compareTo(ProtocolVersion.TLS_1_1) >= 0
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&& !suite.isStreamCipher())
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fragment.position (cipher.getBlockSize());
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else
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fragment.position(0);
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fragment.limit(fragmentLength);
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while (!done)
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{
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int l;
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if (inflater.needsInput())
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{
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l = Math.min(inbuffer.length, fragment.remaining());
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fragment.get(inbuffer, 0, l);
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inflater.setInput(inbuffer);
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}
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l = inflater.inflate(outbuffer);
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out.write(outbuffer, 0, l);
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done = !fragment.hasRemaining() && inflater.finished();
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}
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ByteBuffer outbuf = out.buffer();
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if (outputStream != null)
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{
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byte[] buf = new byte[1024];
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while (outbuf.hasRemaining())
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{
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int l = Math.min(outbuf.remaining(), buf.length);
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outbuf.get(buf, 0, l);
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outputStream.write(buf, 0, l);
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produced += l;
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}
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}
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else
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{
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int i = offset;
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while (outbuf.hasRemaining() && i < offset + length)
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{
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int l = Math.min(output[i].remaining(), outbuf.remaining());
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ByteBuffer b = (ByteBuffer)
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outbuf.duplicate().limit(outbuf.position() + l);
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output[i++].put(b);
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outbuf.position(outbuf.position() + l);
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produced += l;
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}
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if (outbuf.hasRemaining())
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throw new BufferOverflowException();
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}
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}
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else
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{
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ByteBuffer outbuf = (ByteBuffer)
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fragment.duplicate().position(0).limit(record.length() - maclen - padRemoveLen);
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if (record.version().compareTo(ProtocolVersion.TLS_1_1) >= 0
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&& !suite.isStreamCipher())
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outbuf.position(cipher.getBlockSize());
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if (outputStream != null)
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{
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byte[] buf = new byte[1024];
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while (outbuf.hasRemaining())
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{
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int l = Math.min(outbuf.remaining(), buf.length);
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outbuf.get(buf, 0, l);
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outputStream.write(buf, 0, l);
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produced += l;
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}
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}
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else
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{
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int i = offset;
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while (outbuf.hasRemaining() && i < offset + length)
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{
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int l = Math.min(output[i].remaining(), outbuf.remaining());
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ByteBuffer b = (ByteBuffer) outbuf.duplicate().limit(outbuf.position() + l);
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output[i++].put(b);
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outbuf.position(outbuf.position() + l);
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produced += l;
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}
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if (outbuf.hasRemaining())
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throw new BufferOverflowException();
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}
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}
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sequence++;
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return produced;
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}
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CipherSuite cipherSuite ()
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{
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return suite;
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}
|
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}
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