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1 | /* -*-c-*- |
2 | * |
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3 | * Common definitions for the Tiger hash function |
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_TIGER_BASE_H |
29 | #define CATACOMB_TIGER_BASE_H |
30 | |
31 | #ifdef __cplusplus |
32 | extern "C" { |
33 | #endif |
34 | |
35 | /*----- Header files ------------------------------------------------------*/ |
36 | |
37 | #include <mLib/bits.h> |
38 | |
39 | /*----- Macros provided ---------------------------------------------------*/ |
40 | |
41 | /* --- The guts of a single round --- */ |
42 | |
43 | #define TIGER_ROUND(a, b, c, x, n, op) do { \ |
44 | kludge64 _t; \ |
45 | XOR64(c, c, x); \ |
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46 | _t = s[0][U8(LO64(c) >> 0)]; \ |
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47 | XOR64(_t, _t, s[1][U8(LO64(c) >> 16)]); \ |
48 | XOR64(_t, _t, s[2][U8(HI64(c) >> 0)]); \ |
49 | XOR64(_t, _t, s[3][U8(HI64(c) >> 16)]); \ |
50 | SUB64(a, a, _t); \ |
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51 | _t = s[3][U8(LO64(c) >> 8)]; \ |
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52 | XOR64(_t, _t, s[2][U8(LO64(c) >> 24)]); \ |
53 | XOR64(_t, _t, s[1][U8(HI64(c) >> 8)]); \ |
54 | XOR64(_t, _t, s[0][U8(HI64(c) >> 24)]); \ |
55 | ADD64(b, b, _t); \ |
56 | LSL64_(_t, b, n); \ |
57 | op##64(b, _t, b); \ |
58 | } while (0) |
59 | |
60 | /* --- One pass over the buffer --- */ |
61 | |
62 | #define TIGER_PASS(a, b, c, x, n, op) do { \ |
63 | TIGER_ROUND(a, b, c, x[0], n, op); \ |
64 | TIGER_ROUND(b, c, a, x[1], n, op); \ |
65 | TIGER_ROUND(c, a, b, x[2], n, op); \ |
66 | TIGER_ROUND(a, b, c, x[3], n, op); \ |
67 | TIGER_ROUND(b, c, a, x[4], n, op); \ |
68 | TIGER_ROUND(c, a, b, x[5], n, op); \ |
69 | TIGER_ROUND(a, b, c, x[6], n, op); \ |
70 | TIGER_ROUND(b, c, a, x[7], n, op); \ |
71 | } while (0) |
72 | |
73 | /* --- A step in the `key schedule' --- */ |
74 | |
75 | #define TIGER_KSTEP(a, b, c, d, op, n) do { \ |
76 | kludge64 _u; \ |
77 | XOR64(b, b, a); \ |
78 | ADD64(c, c, b); \ |
79 | CPL64(_u, b); op##64_(_u, _u, n); XOR64(_u, _u, c); SUB64(d, d, _u); \ |
80 | } while (0) |
81 | |
82 | /* --- The `key schedule' -- mangle the buffer --- */ |
83 | |
84 | #define TIGER_KSCHED(x) do { \ |
85 | kludge64 _t; \ |
86 | \ |
87 | SET64(_t, 0xa5a5a5a5, 0xa5a5a5a5); \ |
88 | XOR64(_t, _t, x[7]); SUB64(x[0], x[0], _t); \ |
89 | TIGER_KSTEP(x[0], x[1], x[2], x[3], LSL, 19); \ |
90 | TIGER_KSTEP(x[3], x[4], x[5], x[6], LSR, 23); \ |
91 | TIGER_KSTEP(x[6], x[7], x[0], x[1], LSL, 19); \ |
92 | TIGER_KSTEP(x[1], x[2], x[3], x[4], LSR, 23); \ |
93 | XOR64(x[5], x[5], x[4]); \ |
94 | ADD64(x[6], x[6], x[5]); \ |
95 | SET64(_t, 0x01234567, 0x89abcdef); \ |
96 | XOR64(_t, _t, x[6]); SUB64(x[7], x[7], _t); \ |
97 | } while (0) |
98 | |
99 | /* --- The Tiger compression function --- */ |
100 | |
101 | #define TIGER_CORE(a, b, c, x) do { \ |
102 | kludge64 _a, _b, _c; \ |
103 | _a = a, _b = b, _c = c; \ |
104 | TIGER_PASS(_a, _b, _c, x, 2, ADD); \ |
105 | TIGER_KSCHED(x); \ |
106 | TIGER_PASS(_c, _a, _b, x, 3, SUB); \ |
107 | TIGER_KSCHED(x); \ |
108 | TIGER_PASS(_b, _c, _a, x, 3, ADD); \ |
109 | XOR64(a, _a, a); SUB64(b, _b, b); ADD64(c, _c, c); \ |
110 | } while (0) |
111 | |
112 | /*----- That's all, folks -------------------------------------------------*/ |
113 | |
114 | #ifdef __cplusplus |
115 | } |
116 | #endif |
117 | |
118 | #endif |