| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Common definitions for the Tiger hash function |
| 4 | * |
| 5 | * (c) 2000 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 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. |
| 16 | * |
| 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. |
| 21 | * |
| 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 | |
| 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); \ |
| 46 | _t = tiger_s[0][U8(LO64(c) >> 0)]; \ |
| 47 | XOR64(_t, _t, tiger_s[1][U8(LO64(c) >> 16)]); \ |
| 48 | XOR64(_t, _t, tiger_s[2][U8(HI64(c) >> 0)]); \ |
| 49 | XOR64(_t, _t, tiger_s[3][U8(HI64(c) >> 16)]); \ |
| 50 | SUB64(a, a, _t); \ |
| 51 | _t = tiger_s[3][U8(LO64(c) >> 8)]; \ |
| 52 | XOR64(_t, _t, tiger_s[2][U8(LO64(c) >> 24)]); \ |
| 53 | XOR64(_t, _t, tiger_s[1][U8(HI64(c) >> 8)]); \ |
| 54 | XOR64(_t, _t, tiger_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 |