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