netwerk/srtp/src/crypto/include/gf2_8.h@6474c204b198 (annotated)
netwerk/srtp/src/crypto/include/gf2_8.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * gf2_8.h |
| michael@0 | 3 | * |
| michael@0 | 4 | * GF(256) implementation |
| michael@0 | 5 | * |
| michael@0 | 6 | * David A. McGrew |
| michael@0 | 7 | * Cisco Systems, Inc. |
| michael@0 | 8 | */ |
| michael@0 | 9 | |
| michael@0 | 10 | /* |
| michael@0 | 11 | * |
| michael@0 | 12 | * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| michael@0 | 13 | * All rights reserved. |
| michael@0 | 14 | * |
| michael@0 | 15 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 16 | * modification, are permitted provided that the following conditions |
| michael@0 | 17 | * are met: |
| michael@0 | 18 | * |
| michael@0 | 19 | * Redistributions of source code must retain the above copyright |
| michael@0 | 20 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 21 | * |
| michael@0 | 22 | * Redistributions in binary form must reproduce the above |
| michael@0 | 23 | * copyright notice, this list of conditions and the following |
| michael@0 | 24 | * disclaimer in the documentation and/or other materials provided |
| michael@0 | 25 | * with the distribution. |
| michael@0 | 26 | * |
| michael@0 | 27 | * Neither the name of the Cisco Systems, Inc. nor the names of its |
| michael@0 | 28 | * contributors may be used to endorse or promote products derived |
| michael@0 | 29 | * from this software without specific prior written permission. |
| michael@0 | 30 | * |
| michael@0 | 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| michael@0 | 34 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| michael@0 | 35 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| michael@0 | 36 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 37 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| michael@0 | 38 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| michael@0 | 39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| michael@0 | 40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 41 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| michael@0 | 42 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 43 | * |
| michael@0 | 44 | */ |
| michael@0 | 45 | |
| michael@0 | 46 | |
| michael@0 | 47 | #ifndef GF2_8_H |
| michael@0 | 48 | #define GF2_8_H |
| michael@0 | 49 | |
| michael@0 | 50 | #include "datatypes.h" /* for uint8_t definition */ |
| michael@0 | 51 | |
| michael@0 | 52 | typedef uint8_t gf2_8; |
| michael@0 | 53 | |
| michael@0 | 54 | #define gf2_8_field_polynomial 0x1B |
| michael@0 | 55 | |
| michael@0 | 56 | /* |
| michael@0 | 57 | * gf2_8_shift(x) returns |
| michael@0 | 58 | */ |
| michael@0 | 59 | |
| michael@0 | 60 | /* |
| michael@0 | 61 | * gf2_8_shift(z) returns the result of the GF(2^8) 'multiply by x' |
| michael@0 | 62 | * operation, using the field representation from AES; that is, the |
| michael@0 | 63 | * next gf2_8 value in the cyclic representation of that field. The |
| michael@0 | 64 | * value z should be an uint8_t. |
| michael@0 | 65 | */ |
| michael@0 | 66 | |
| michael@0 | 67 | #define gf2_8_shift(z) (((z) & 128) ? \ |
| michael@0 | 68 | (((z) << 1) ^ gf2_8_field_polynomial) : ((z) << 1)) |
| michael@0 | 69 | |
| michael@0 | 70 | gf2_8 |
| michael@0 | 71 | gf2_8_compute_inverse(gf2_8 x); |
| michael@0 | 72 | |
| michael@0 | 73 | void |
| michael@0 | 74 | test_gf2_8(void); |
| michael@0 | 75 | |
| michael@0 | 76 | gf2_8 |
| michael@0 | 77 | gf2_8_multiply(gf2_8 x, gf2_8 y); |
| michael@0 | 78 | |
| michael@0 | 79 | #endif /* GF2_8_H */ |
