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