chiark - git - mdw - catacomb/blob - symm/tiger-base.h

   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