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/*
 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */


package sun.security.ssl;


/**
 * SSL/TLS records, as pulled off (and put onto) a TCP stream.  This is
 * the base interface, which defines common information and interfaces
 * used by both Input and Output records.
 *
 * @author David Brownell
 */
interface Record {
    /*
     * There are four SSL record types, which are part of the interface
     * to this level (along with the maximum record size)
     *
     * enum { change_cipher_spec(20), alert(21), handshake(22),
     *      application_data(23), (255) } ContentType;
     */
    static final byte   ct_change_cipher_spec = 20;
    static final byte   ct_alert = 21;
    static final byte   ct_handshake = 22;
    static final byte   ct_application_data = 23;

    static final int    headerSize = 5;         // SSLv3 record header
    static final int    maxExpansion = 1024;    // for bad compression
    static final int    trailerSize = 20;       // SHA1 hash size
    static final int    maxDataSize = 16384;    // 2^14 bytes of data
    static final int    maxPadding = 256;       // block cipher padding
    static final int    maxIVLength = 256;      // IV length

    /*
     * The size of the header plus the max IV length
     */
    static final int    headerPlusMaxIVSize =
                                      headerSize        // header
                                    + maxIVLength;      // iv

    /*
     * SSL has a maximum record size.  It's header, (compressed) data,
     * padding, and a trailer for the message authentication information (MAC
     * for block and stream ciphers, and message authentication tag for AEAD
     * ciphers).
     *
     * Some compression algorithms have rare cases where they expand the data.
     * As we don't support compression at this time, leave that out.
     */
    static final int    maxRecordSize =
                                      headerPlusMaxIVSize   // header + iv
                                    + maxDataSize           // data
                                    + maxPadding            // padding
                                    + trailerSize;          // MAC or AEAD tag

    static final boolean enableCBCProtection =
            Debug.getBooleanProperty("jsse.enableCBCProtection", true);

    /*
     * For CBC protection in SSL3/TLS1, we break some plaintext into two
     * packets.  Max application data size for the second packet.
     */
    static final int    maxDataSizeMinusOneByteRecord =
                                  maxDataSize       // max data size
                                - (                 // max one byte record size
                                      headerPlusMaxIVSize   // header + iv
                                    + 1             // one byte data
                                    + maxPadding    // padding
                                    + trailerSize   // MAC
                                  );

    /*
     * The maximum large record size.
     *
     * Some SSL/TLS implementations support large fragment upto 2^15 bytes,
     * such as Microsoft. We support large incoming fragments.
     *
     * The maximum large record size is defined as maxRecordSize plus 2^14,
     * this is the amount OpenSSL is using.
     */
    static final int    maxLargeRecordSize =
                maxRecordSize   // Max size with a conforming implementation
              + maxDataSize;    // extra 2^14 bytes for large data packets.


    /*
     * Maximum record size for alert and change cipher spec records.
     * They only contain 2 and 1 bytes of data, respectively.
     * Allocate a smaller array.
     */

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