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/*
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* Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.ssl;
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/**
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* SSL/TLS records, as pulled off (and put onto) a TCP stream. This is
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* the base interface, which defines common information and interfaces
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* used by both Input and Output records.
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*
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* @author David Brownell
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*/
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interface Record {
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/*
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* There are four SSL record types, which are part of the interface
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* to this level (along with the maximum record size)
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*
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* enum { change_cipher_spec(20), alert(21), handshake(22),
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* application_data(23), (255) } ContentType;
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*/
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static final byte ct_change_cipher_spec = 20;
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static final byte ct_alert = 21;
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static final byte ct_handshake = 22;
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static final byte ct_application_data = 23;
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static final int headerSize = 5; // SSLv3 record header
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static final int maxExpansion = 1024; // for bad compression
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static final int trailerSize = 20; // SHA1 hash size
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static final int maxDataSize = 16384; // 2^14 bytes of data
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static final int maxPadding = 256; // block cipher padding
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static final int maxIVLength = 256; // block length
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/*
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* SSL has a maximum record size. It's header, (compressed) data,
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* padding, and a trailer for the MAC.
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* Some compression algorithms have rare cases where they expand the data.
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* As we don't support compression at this time, leave that out.
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*/
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static final int maxRecordSize =
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headerSize // header
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+ maxIVLength // iv
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+ maxDataSize // data
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+ maxPadding // padding
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+ trailerSize; // MAC
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static final boolean enableCBCProtection =
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Debug.getBooleanProperty("jsse.enableCBCProtection", true);
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/*
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* For CBC protection in SSL3/TLS1, we break some plaintext into two
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* packets. Max application data size for the second packet.
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*/
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static final int maxDataSizeMinusOneByteRecord =
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maxDataSize // max data size
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- ( // max one byte record size
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headerSize // header
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+ maxIVLength // iv
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+ 1 // one byte data
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+ maxPadding // padding
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+ trailerSize // MAC
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);
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/*
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* The maximum large record size.
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*
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* Some SSL/TLS implementations support large fragment upto 2^15 bytes,
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* such as Microsoft. We support large incoming fragments.
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*
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* The maximum large record size is defined as maxRecordSize plus 2^14,
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* this is the amount OpenSSL is using.
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*/
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static final int maxLargeRecordSize =
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maxRecordSize // Max size with a conforming implemenation
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+ maxDataSize; // extra 2^14 bytes for large data packets.
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/*
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* Maximum record size for alert and change cipher spec records.
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* They only contain 2 and 1 bytes of data, respectively.
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* Allocate a smaller array.
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*/
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static final int maxAlertRecordSize =
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headerSize // header
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+ maxIVLength // iv
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+ 2 // alert
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+ maxPadding // padding
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+ trailerSize; // MAC
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}
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