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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2010, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * 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 | + static final int maxIVLength = 256; // block length | |
| 56 | + | |
| 57 | + /* | |
| 58 | + * SSL has a maximum record size. It's header, (compressed) data, | |
| 59 | + * padding, and a trailer for the MAC. | |
| 60 | + * Some compression algorithms have rare cases where they expand the data. | |
| 61 | + * As we don't support compression at this time, leave that out. | |
| 62 | + */ | |
| 63 | + static final int maxRecordSize = | |
| 64 | + headerSize // header | |
| 65 | + + maxIVLength // iv | |
| 66 | + + maxDataSize // data | |
| 67 | + + maxPadding // padding | |
| 68 | + + trailerSize; // MAC | |
| 69 | + | |
| 70 | + /* | |
| 71 | + * The maximum large record size. | |
| 72 | + * | |
| 73 | + * Some SSL/TLS implementations support large fragment upto 2^15 bytes, | |
| 74 | + * such as Microsoft. We support large incoming fragments. | |
| 75 | + * | |
| 76 | + * The maximum large record size is defined as maxRecordSize plus 2^14, | |
| 77 | + * this is the amount OpenSSL is using. | |
| 78 | + */ | |
| 79 | + static final int maxLargeRecordSize = | |
| 80 | + maxRecordSize // Max size with a conforming implemenation | |
| 81 | + + maxDataSize; // extra 2^14 bytes for large data packets. | |
| 82 | + | |
| 83 | + | |
| 84 | + /* | |
| 85 | + * Maximum record size for alert and change cipher spec records. | |
| 86 | + * They only contain 2 and 1 bytes of data, respectively. | |
| 87 | + * Allocate a smaller array. | |
| 88 | + */ | |
| 89 | + static final int maxAlertRecordSize = | |
| 90 | + headerSize // header | |
| 91 | + + maxIVLength // iv | |
| 92 | + + 2 // alert | |
| 93 | + + maxPadding // padding | |
| 94 | + + trailerSize; // MAC | |
| 95 | + | |
| 96 | +} | |