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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: cast-base.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Basic macros and definitions for CAST-128 and CAST-256 |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
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18 | * |
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19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
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23 | * |
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24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | #ifndef CATACOMB_CAST_BASE_H |
31 | #define CATACOMB_CAST_BASE_H |
32 | |
33 | #ifdef __cplusplus |
34 | extern "C" { |
35 | #endif |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <mLib/bits.h> |
40 | |
41 | /*----- Round functions ---------------------------------------------------*/ |
42 | |
43 | #define CAST_R_guts(km, kr, xx, yy, aop, bop, cop) do { \ |
44 | uint32 i = km aop yy; \ |
45 | unsigned _r = kr; \ |
46 | i = ROL32(i, _r); \ |
47 | xx ^= ((cast_s[0][U8(i >> 24)] bop \ |
48 | cast_s[1][U8(i >> 16)]) cop \ |
49 | cast_s[2][U8(i >> 8)]) aop \ |
50 | cast_s[3][U8(i >> 0)]; \ |
51 | } while (0) |
52 | |
53 | #define CAST_R1(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, +, ^, -) |
54 | #define CAST_R2(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, ^, -, +) |
55 | #define CAST_R3(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, -, +, ^) |
56 | |
57 | /*----- Global variables --------------------------------------------------*/ |
58 | |
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59 | extern const uint32 cast_s[4][256], cast_sk[4][256]; |
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60 | |
61 | /*----- That's all, folks -------------------------------------------------*/ |
62 | |
63 | #ifdef __cplusplus |
64 | } |
65 | #endif |
66 | |
67 | #endif |