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

   1 /* -*-c-*-
   2  *
   3  * $Id: rijndael192.c,v 1.1 2001/05/07 17:32:03 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 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: rijndael192.c,v $
  33  * Revision 1.1  2001/05/07 17:32:03  mdw
  34  * New Rijndael block sizes.
  35  *
  36  */
  37
  38 /*----- Header files ------------------------------------------------------*/
  39
  40 #include <assert.h>
  41 #include <stdio.h>
  42
  43 #include <mLib/bits.h>
  44
  45 #include "blkc.h"
  46 #include "gcipher.h"
  47 #include "rijndael.h"
  48 #include "rijndael192.h"
  49 #include "rijndael-base.h"
  50
  51 /*----- Main code ---------------------------------------------------------*/
  52
  53 /* --- @rijndael192_init@ --- *
  54  *
  55  * Arguments:   @rijndael_ctx *k@ = pointer to context to initialize
  56  *              @const void *buf@ = pointer to buffer of key material
  57  *              @size_t sz@ = size of the key material
  58  *
  59  * Returns:     ---
  60  *
  61  * Use:         Initializes a Rijndael context with a particular key.  This
  62  *              implementation of Rijndael doesn't impose any particular
  63  *              limits on the key size except that it must be multiple of 4
  64  *              bytes long.  256 bits seems sensible, though.
  65  */
  66
  67 void rijndael192_init(rijndael_ctx *k, const void *buf, size_t sz)
  68 {
  69   rijndael_setup(k, RIJNDAEL192_BLKSZ / 4, buf, sz);
  70 }
  71
  72 /* --- @rijndael192_eblk@, @rijndael192_dblk@ --- *
  73  *
  74  * Arguments:   @const rijndael_ctx *k@ = pointer to Rijndael context
  75  *              @const uint32 s[4]@ = pointer to source block
  76  *              @uint32 d[4]@ = pointer to destination block
  77  *
  78  * Returns:     ---
  79  *
  80  * Use:         Low-level block encryption and decryption.
  81  */
  82
  83 #define DO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do {   \
  84   aa = what(t, a, b, c, d) ^ *w++;                                      \
  85   bb = what(t, b, c, d, e) ^ *w++;                                      \
  86   cc = what(t, c, d, e, f) ^ *w++;                                      \
  87   dd = what(t, d, e, f, a) ^ *w++;                                      \
  88   ee = what(t, e, f, a, b) ^ *w++;                                      \
  89   ff = what(t, f, a, b, c) ^ *w++;                                      \
  90 } while (0)
  91
  92 #define UNDO(what, t, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w) do { \
  93   aa = what(t, a, f, e, d) ^ *w++;                                      \
  94   bb = what(t, b, a, f, e) ^ *w++;                                      \
  95   cc = what(t, c, b, a, f) ^ *w++;                                      \
  96   dd = what(t, d, c, b, a) ^ *w++;                                      \
  97   ee = what(t, e, d, c, b) ^ *w++;                                      \
  98   ff = what(t, f, e, d, c) ^ *w++;                                      \
  99 } while (0)
 100
 101 void rijndael192_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 102 {
 103   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
 104   uint32 aa, bb, cc, dd, ee, ff;
 105   uint32 *w = k->w;
 106
 107   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 108   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 109
 110   switch (k->nr) {
 111     case 14:
 112       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 113     case 13:
 114       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 115     case 12:
 116     default:
 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       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 121       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 122       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 123       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 124       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 125       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 126       DO(MIX, T, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 127       DO(MIX, T, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 128   }
 129   DO(SUB, S, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 130
 131   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 132 }
 133
 134 void rijndael192_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 135 {
 136   uint32 a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5];
 137   uint32 aa, bb, cc, dd, ee, ff;
 138   uint32 *w = k->wi;
 139
 140   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++; e ^= *w++; f ^= *w++;
 141   aa = a; bb = b; cc = c; dd = d; ee = e; ff = f;
 142
 143   switch (k->nr) {
 144     case 14:
 145       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 146     case 13:
 147       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 148     case 12:
 149     default:
 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       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 154       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 155       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 156       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 157       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 158       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 159       UNDO(MIX, TI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 160       UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, a, b, c, d, e, f, w);
 161   }
 162   UNDO(SUB, SI, a, b, c, d, e, f, aa, bb, cc, dd, ee, ff, w);
 163
 164   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d; dst[4] = e; dst[5] = f;
 165 }
 166
 167 BLKC_TEST(RIJNDAEL192, rijndael192)
 168
 169 /*----- That's all, folks -------------------------------------------------*/