mdw@git.distorted.org.uk Git - catacomb/blob - symm/rijndael192.c

   1 /* -*-c-*-
   2  *
   3  * The Rijndael block cipher, 192-bit version
   4  *
   5  * (c) 2001 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 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <assert.h>
  31 #include <stdio.h>
  32
  33 #include <mLib/bits.h>
  34
  35 #if defined(TEST_RIG) && defined(ENABLE_ASM_DEBUG)
  36 #  include "regdump.h"
  37 #  define BLKC_TESTHOOK do { regdump_init(); } while (0)
  38 #endif
  39
  40 #include "blkc.h"
  41 #include "gcipher.h"
  42 #include "rijndael.h"
  43 #include "rijndael192.h"
  44 #include "rijndael-base.h"
  45
  46 /*----- Main code ---------------------------------------------------------*/
  47
  48 /* --- @rijndael192_init@ --- *
  49  *
  50  * Arguments:   @rijndael_ctx *k@ = pointer to context to initialize
  51  *              @const void *buf@ = pointer to buffer of key material
  52  *              @size_t sz@ = size of the key material
  53  *
  54  * Returns:     ---
  55  *
  56  * Use:         Initializes a Rijndael context with a particular key.  This
  57  *              implementation of Rijndael doesn't impose any particular
  58  *              limits on the key size except that it must be multiple of 4
  59  *              bytes long.  256 bits seems sensible, though.
  60  */
  61
  62 void rijndael192_init(rijndael_ctx *k, const void *buf, size_t sz)
  63 {
  64   rijndael_setup(k, RIJNDAEL192_BLKSZ / 4, buf, sz);
  65 }
  66
  67 /* --- @rijndael192_eblk@, @rijndael192_dblk@ --- *
  68  *
  69  * Arguments:   @const rijndael_ctx *k@ = pointer to Rijndael context
  70  *              @const uint32 s[4]@ = pointer to source block
  71  *              @uint32 d[4]@ = pointer to destination block
  72  *
  73  * Returns:     ---
  74  *
  75  * Use:         Low-level block encryption and decryption.
  76  */
  77
  78 #define DO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do {   \
  79   aa = what(t, a, b, c, d) ^ *w++;                                      \
  80   bb = what(t, b, c, d, e) ^ *w++;                                      \
  81   cc = what(t, c, d, e, f) ^ *w++;                                      \
  82   dd = what(t, d, e, f, a) ^ *w++;                                      \
  83   ee = what(t, e, f, a, b) ^ *w++;                                      \
  84   ff = what(t, f, a, b, c) ^ *w++;                                      \
  85 } while (0)
  86
  87 #define UNDO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do { \
  88   aa = what(t, a, f, e, d) ^ *w++;                                      \
  89   bb = what(t, b, a, f, e) ^ *w++;                                      \
  90   cc = what(t, c, b, a, f) ^ *w++;                                      \
  91   dd = what(t, d, c, b, a) ^ *w++;                                      \
  92   ee = what(t, e, d, c, b) ^ *w++;                                      \
  93   ff = what(t, f, e, d, c) ^ *w++;                                      \
  94 } while (0)
  95
  96 void rijndael192_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
  97 {
  98   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
  99   uint32 aa, bb, cc, dd, ee, ff;
 100   const uint32 *w = k->w;
 101
 102   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 103   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 104
 105   switch (k->nr) {
 106     case 14:
 107       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 108     case 13:
 109       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 110     case 12:
 111     default:
 112       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 113       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 114       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 115       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 116       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 117       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 118       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 119       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 120       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 121       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 122       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 123   }
 124   DO(SUB, S, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 125
 126   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 127 }
 128
 129 void rijndael192_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 130 {
 131   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
 132   uint32 aa, bb, cc, dd, ee, ff;
 133   const uint32 *w = k->wi;
 134
 135   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 136   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 137
 138   switch (k->nr) {
 139     case 14:
 140       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 141     case 13:
 142       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 143     case 12:
 144     default:
 145       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 146       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 147       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 148       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 149       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 150       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 151       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 152       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 153       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 154       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 155       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 156   }
 157   UNDO(SUB, SI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 158
 159   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 160 }
 161
 162 BLKC_TEST(RIJNDAEL192, rijndael192)
 163
 164 /*----- That's all, folks -------------------------------------------------*/