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jeremybenn |
/* OutputSecurityParameters.java --
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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.ByteBufferOutputStream;
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import java.nio.ByteBuffer;
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import java.util.zip.DataFormatException;
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import java.util.zip.Deflater;
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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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public class OutputSecurityParameters
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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 Deflater deflater;
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private final SessionImpl session;
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private final CipherSuite suite;
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private long sequence;
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public OutputSecurityParameters (final Cipher cipher, final Mac mac,
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final Deflater deflater, SessionImpl session,
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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.deflater = deflater;
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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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* Encrypt a record, storing the result in the given output buffer.
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*
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* @return The number of bytes taken from the input, and the number stored
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* into `output;' that is, the size of the encrypted fragment, plus the
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* encoding for the record.
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*/
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public int[] encrypt (final ByteBuffer[] input, int offset, int length,
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final ContentType contentType, final ByteBuffer output)
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throws DataFormatException, IllegalBlockSizeException, ShortBufferException
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{
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if (offset < 0 || offset >= input.length
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|| length <= 0 || offset + length > input.length)
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throw new IndexOutOfBoundsException();
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if (Debug.DEBUG)
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for (int i = offset; i < offset+length; i++)
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logger.logv(Component.SSL_RECORD_LAYER, "encrypting record [{0}]: {1}",
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i-offset, input[i]);
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int maclen = 0;
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if (mac != null)
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maclen = session.isTruncatedMac() ? 10 : mac.getMacLength ();
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int ivlen = 0;
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byte[] iv = null;
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if (session.version.compareTo(ProtocolVersion.TLS_1_1) >= 0
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&& !suite.isStreamCipher())
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{
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ivlen = cipher.getBlockSize();
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iv = new byte[ivlen];
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session.random().nextBytes(iv);
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}
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int padaddlen = 0;
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if (!suite.isStreamCipher()
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&& session.version.compareTo(ProtocolVersion.TLS_1) >= 0)
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{
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padaddlen = (session.random().nextInt(255 / cipher.getBlockSize())
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* cipher.getBlockSize());
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}
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int fragmentLength = 0;
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ByteBuffer[] fragments = null;
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// Compress the content, if needed.
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if (deflater != null)
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{
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ByteBufferOutputStream deflated = new ByteBufferOutputStream();
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byte[] inbuf = new byte[1024];
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byte[] outbuf = new byte[1024];
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int written = 0;
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// Here we use the guarantee that the deflater won't increase the
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// output size by more than 1K -- we resign ourselves to only deflate
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// as much data as we have space for *uncompressed*,
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int limit = output.remaining() - (maclen + ivlen + padaddlen) - 1024;
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for (int i = offset; i < length && written < limit; i++)
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{
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ByteBuffer in = input[i];
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while (in.hasRemaining() && written < limit)
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{
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int l = Math.min(in.remaining(), inbuf.length);
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l = Math.min(limit - written, l);
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in.get(inbuf, 0, l);
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deflater.setInput(inbuf, 0, l);
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l = deflater.deflate(outbuf);
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deflated.write(outbuf, 0, l);
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written += l;
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}
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}
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deflater.finish();
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while (!deflater.finished())
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{
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int l = deflater.deflate(outbuf);
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deflated.write(outbuf, 0, l);
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written += l;
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}
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fragments = new ByteBuffer[] { deflated.buffer() };
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fragmentLength = ((int) deflater.getBytesWritten()) + maclen + ivlen;
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deflater.reset();
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offset = 0;
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length = 1;
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}
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else
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{
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int limit = output.remaining() - (maclen + ivlen + padaddlen);
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fragments = input;
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for (int i = offset; i < length && fragmentLength < limit; i++)
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{
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int l = Math.min(limit - fragmentLength, fragments[i].remaining());
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fragmentLength += l;
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}
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fragmentLength += maclen + ivlen;
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}
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// Compute padding...
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int padlen = 0;
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byte[] pad = null;
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if (!suite.isStreamCipher())
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{
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int bs = cipher.getBlockSize();
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padlen = bs - (fragmentLength % bs);
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if (Debug.DEBUG)
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logger.logv(Component.SSL_RECORD_LAYER,
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"framentLen:{0} padlen:{1} blocksize:{2}",
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fragmentLength, padlen, bs);
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if (session.version.compareTo(ProtocolVersion.TLS_1) >= 0)
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{
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// TLS 1.0 and later uses a random amount of padding, up to
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// 255 bytes. Each byte of the pad is equal to the padding
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// length, minus one.
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padlen += padaddlen;
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while (padlen > 255)
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padlen -= bs;
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pad = new byte[padlen];
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for (int i = 0; i < padlen; i++)
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pad[i] = (byte) (padlen - 1);
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}
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else
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{
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// SSL 3 uses a pad only as large as the block size, but the
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// pad may contain any values.
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pad = new byte[padlen];
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session.random().nextBytes(pad);
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pad[padlen - 1] = (byte) (padlen - 1);
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}
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fragmentLength += pad.length;
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}
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// If there is a MAC, compute it.
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byte[] macValue = null;
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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) contentType.getValue());
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if (session.version != ProtocolVersion.SSL_3)
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{
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mac.update((byte) session.version.major ());
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mac.update((byte) session.version.minor ());
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}
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int toWrite = fragmentLength - maclen - ivlen - padlen;
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mac.update((byte) (toWrite >>> 8));
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mac.update((byte) toWrite);
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int written = 0;
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for (int i = offset; i < length && written < toWrite; i++)
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{
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ByteBuffer fragment = fragments[i].duplicate();
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int l = Math.min(fragment.remaining(), toWrite - written);
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fragment.limit(fragment.position() + l);
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mac.update(fragment);
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}
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macValue = mac.doFinal();
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}
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Record outrecord = new Record(output);
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outrecord.setContentType(contentType);
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outrecord.setVersion(session.version);
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outrecord.setLength(fragmentLength);
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int consumed = 0;
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ByteBuffer outfragment = outrecord.fragment();
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if (cipher != null)
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{
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if (iv != null)
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cipher.update(ByteBuffer.wrap(iv), outfragment);
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int toWrite = fragmentLength - maclen - ivlen - padlen;
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for (int i = offset; i < offset + length && consumed < toWrite; i++)
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{
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ByteBuffer fragment = fragments[i].slice();
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int l = Math.min(fragment.remaining(), toWrite - consumed);
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fragment.limit(fragment.position() + l);
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cipher.update(fragment, outfragment);
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fragments[i].position(fragments[i].position() + l);
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consumed += l;
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}
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if (macValue != null)
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cipher.update(ByteBuffer.wrap(macValue), outfragment);
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if (pad != null)
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cipher.update(ByteBuffer.wrap(pad), outfragment);
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}
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else
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{
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// iv and pad are only used if we have a block cipher.
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int toWrite = fragmentLength - maclen;
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for (int i = offset; i < offset + length && consumed < toWrite; i++)
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{
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ByteBuffer fragment = fragments[i];
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int l = Math.min(fragment.remaining(), toWrite - consumed);
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fragment.limit(fragment.position() + l);
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outfragment.put(fragment);
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consumed += l;
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}
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if (macValue != null)
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outfragment.put(macValue);
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}
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// Advance the output buffer's position.
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output.position(output.position() + outrecord.length() + 5);
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sequence++;
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return new int[] { consumed, fragmentLength + 5 };
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}
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CipherSuite suite()
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{
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return suite;
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}
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}
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