| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | package sun.security.ssl; |
| 28 | |
| 29 | |
| 30 | /** |
| 31 | * SSL/TLS records, as pulled off (and put onto) a TCP stream. This is |
| 32 | * the base interface, which defines common information and interfaces |
| 33 | * used by both Input and Output records. |
| 34 | * |
| 35 | * @author David Brownell |
| 36 | */ |
| 37 | interface Record { |
| 38 | /* |
| 39 | * There are four SSL record types, which are part of the interface |
| 40 | * to this level (along with the maximum record size) |
| 41 | * |
| 42 | * enum { change_cipher_spec(20), alert(21), handshake(22), |
| 43 | * application_data(23), (255) } ContentType; |
| 44 | */ |
| 45 | static final byte ct_change_cipher_spec = 20; |
| 46 | static final byte ct_alert = 21; |
| 47 | static final byte ct_handshake = 22; |
| 48 | static final byte ct_application_data = 23; |
| 49 | |
| 50 | static final int headerSize = 5; // SSLv3 record header |
| 51 | static final int maxExpansion = 1024; // for bad compression |
| 52 | static final int trailerSize = 20; // SHA1 hash size |
| 53 | static final int maxDataSize = 16384; // 2^14 bytes of data |
| 54 | static final int maxPadding = 256; // block cipher padding |
| 55 | |
| 56 | /* |
| 57 | * SSL has a maximum record size. It's header, (compressed) data, |
| 58 | * padding, and a trailer for the MAC. |
| 59 | * Some compression algorithms have rare cases where they expand the data. |
| 60 | * As we don't support compression at this time, leave that out. |
| 61 | */ |
| 62 | static final int maxRecordSize = |
| 63 | headerSize // header |
| 64 | + maxDataSize // data |
| 65 | + maxPadding // padding |
| 66 | + trailerSize; // MAC |
| 67 | |
| 68 | /* |
| 69 | * The maximum large record size. |
| 70 | * |
| 71 | * Some SSL/TLS implementations support large fragment upto 2^15 bytes, |
| 72 | * such as Microsoft. We support large incoming fragments. |
| 73 | * |
| 74 | * The maximum large record size is defined as maxRecordSize plus 2^14, |
| 75 | * this is the amount OpenSSL is using. |
| 76 | */ |
| 77 | static final int maxLargeRecordSize = |
| 78 | maxRecordSize // Max size with a conforming implemenation |
| 79 | + maxDataSize; // extra 2^14 bytes for large data packets. |
| 80 | |
| 81 | |
| 82 | /* |
| 83 | * Maximum record size for alert and change cipher spec records. |
| 84 | * They only contain 2 and 1 bytes of data, respectively. |
| 85 | * Allocate a smaller array. |
| 86 | */ |
| 87 | static final int maxAlertRecordSize = |
| 88 | headerSize + 2 + maxPadding + trailerSize; |
| 89 | |
| 90 | } |