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

   1 /* -*-c-*-
   2  *
   3  * $Id: rijndael192.c,v 1.2 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * The Rijndael block cipher, 192-bit version
   6  *
   7  * (c) 2001 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Header files ------------------------------------------------------*/
  31
  32 #include <assert.h>
  33 #include <stdio.h>
  34
  35 #include <mLib/bits.h>
  36
  37 #include "blkc.h"
  38 #include "gcipher.h"
  39 #include "rijndael.h"
  40 #include "rijndael192.h"
  41 #include "rijndael-base.h"
  42
  43 /*----- Main code ---------------------------------------------------------*/
  44
  45 /* --- @rijndael192_init@ --- *
  46  *
  47  * Arguments:   @rijndael_ctx *k@ = pointer to context to initialize
  48  *              @const void *buf@ = pointer to buffer of key material
  49  *              @size_t sz@ = size of the key material
  50  *
  51  * Returns:     ---
  52  *
  53  * Use:         Initializes a Rijndael context with a particular key.  This
  54  *              implementation of Rijndael doesn't impose any particular
  55  *              limits on the key size except that it must be multiple of 4
  56  *              bytes long.  256 bits seems sensible, though.
  57  */
  58
  59 void rijndael192_init(rijndael_ctx *k, const void *buf, size_t sz)
  60 {
  61   rijndael_setup(k, RIJNDAEL192_BLKSZ / 4, buf, sz);
  62 }
  63
  64 /* --- @rijndael192_eblk@, @rijndael192_dblk@ --- *
  65  *
  66  * Arguments:   @const rijndael_ctx *k@ = pointer to Rijndael context
  67  *              @const uint32 s[4]@ = pointer to source block
  68  *              @uint32 d[4]@ = pointer to destination block
  69  *
  70  * Returns:     ---
  71  *
  72  * Use:         Low-level block encryption and decryption.
  73  */
  74
  75 #define DO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do {   \
  76   aa = what(t, a, b, c, d) ^ *w++;                                      \
  77   bb = what(t, b, c, d, e) ^ *w++;                                      \
  78   cc = what(t, c, d, e, f) ^ *w++;                                      \
  79   dd = what(t, d, e, f, a) ^ *w++;                                      \
  80   ee = what(t, e, f, a, b) ^ *w++;                                      \
  81   ff = what(t, f, a, b, c) ^ *w++;                                      \
  82 } while (0)
  83
  84 #define UNDO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do { \
  85   aa = what(t, a, f, e, d) ^ *w++;                                      \
  86   bb = what(t, b, a, f, e) ^ *w++;                                      \
  87   cc = what(t, c, b, a, f) ^ *w++;                                      \
  88   dd = what(t, d, c, b, a) ^ *w++;                                      \
  89   ee = what(t, e, d, c, b) ^ *w++;                                      \
  90   ff = what(t, f, e, d, c) ^ *w++;                                      \
  91 } while (0)
  92
  93 void rijndael192_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
  94 {
  95   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
  96   uint32 aa, bb, cc, dd, ee, ff;
  97   const uint32 *w = k->w;
  98
  99   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 100   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 101
 102   switch (k->nr) {
 103     case 14:
 104       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 105     case 13:
 106       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 107     case 12:
 108     default:
 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       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 119       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 120   }
 121   DO(SUB, S, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 122
 123   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 124 }
 125
 126 void rijndael192_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 127 {
 128   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
 129   uint32 aa, bb, cc, dd, ee, ff;
 130   const uint32 *w = k->wi;
 131
 132   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 133   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 134
 135   switch (k->nr) {
 136     case 14:
 137       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 138     case 13:
 139       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 140     case 12:
 141     default:
 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       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 152       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 153   }
 154   UNDO(SUB, SI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 155
 156   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 157 }
 158
 159 BLKC_TEST(RIJNDAEL192, rijndael192)
 160
 161 /*----- That's all, folks -------------------------------------------------*/