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

   1 /* -*-c-*-
   2  *
   3  * The Rijndael block cipher
   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 /*----- Header files ------------------------------------------------------*/
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <stdio.h>
  34
  35 #include <mLib/bits.h>
  36
  37 #include "blkc.h"
  38 #include "dispatch.h"
  39 #include "gcipher.h"
  40 #include "rijndael.h"
  41 #include "rijndael-base.h"
  42
  43 /*----- Main code ---------------------------------------------------------*/
  44
  45 /* --- @rijndael_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 rijndael_init(rijndael_ctx *k, const void *buf, size_t sz)
  60 {
  61   rijndael_setup(k, RIJNDAEL_BLKSZ / 4, buf, sz);
  62 }
  63
  64 /* --- @rijndael_eblk@, @rijndael_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 CPU_DISPATCH(EMPTY, EMPTY, void, rijndael_eblk,
  76              (const rijndael_ctx *k, const uint32 s[4], uint32 d[4]),
  77              (k, s, d), pick_eblk, simple_eblk)
  78
  79 CPU_DISPATCH(EMPTY, EMPTY, void, rijndael_dblk,
  80              (const rijndael_ctx *k, const uint32 s[4], uint32 d[4]),
  81              (k, s, d), pick_dblk, simple_dblk)
  82
  83 #if CPUFAM_X86 || CPUFAM_AMD64
  84 extern rijndael_eblk__functype rijndael_eblk_x86ish_aesni;
  85 extern rijndael_dblk__functype rijndael_dblk_x86ish_aesni;
  86 #endif
  87 #if CPUFAM_ARMEL && HAVE_AS_ARMV8_CRYPTO
  88 extern rijndael_eblk__functype rijndael_eblk_arm_crypto;
  89 extern rijndael_dblk__functype rijndael_dblk_arm_crypto;
  90 #endif
  91 #if CPUFAM_ARM64
  92 extern rijndael_eblk__functype rijndael_eblk_arm64_crypto;
  93 extern rijndael_dblk__functype rijndael_dblk_arm64_crypto;
  94 #endif
  95
  96 static rijndael_eblk__functype *pick_eblk(void)
  97 {
  98 #if CPUFAM_X86 || CPUFAM_AMD64
  99   DISPATCH_PICK_COND(rijndael_eblk, rijndael_eblk_x86ish_aesni,
 100                      cpu_feature_p(CPUFEAT_X86_AESNI));
 101 #endif
 102 #if CPUFAM_ARMEL && HAVE_AS_ARMV8_CRYPTO
 103   DISPATCH_PICK_COND(rijndael_eblk, rijndael_eblk_arm_crypto,
 104                      cpu_feature_p(CPUFEAT_ARM_AES));
 105 #endif
 106 #if CPUFAM_ARM64
 107   DISPATCH_PICK_COND(rijndael_eblk, rijndael_eblk_arm64_crypto,
 108                      cpu_feature_p(CPUFEAT_ARM_AES));
 109 #endif
 110   DISPATCH_PICK_FALLBACK(rijndael_eblk, simple_eblk);
 111 }
 112
 113 static rijndael_dblk__functype *pick_dblk(void)
 114 {
 115 #if CPUFAM_X86 || CPUFAM_AMD64
 116   DISPATCH_PICK_COND(rijndael_dblk, rijndael_dblk_x86ish_aesni,
 117                      cpu_feature_p(CPUFEAT_X86_AESNI));
 118 #endif
 119 #if CPUFAM_ARMEL && HAVE_AS_ARMV8_CRYPTO
 120   DISPATCH_PICK_COND(rijndael_dblk, rijndael_dblk_arm_crypto,
 121                      cpu_feature_p(CPUFEAT_ARM_AES));
 122 #endif
 123 #if CPUFAM_ARM64
 124   DISPATCH_PICK_COND(rijndael_dblk, rijndael_dblk_arm64_crypto,
 125                      cpu_feature_p(CPUFEAT_ARM_AES));
 126 #endif
 127   DISPATCH_PICK_FALLBACK(rijndael_dblk, simple_dblk);
 128 }
 129
 130 #define DO(what, t, aa, bb, cc, dd, a, b, c, d, w) do {                 \
 131   aa = what(t, a, b, c, d) ^ *w++;                                      \
 132   bb = what(t, b, c, d, a) ^ *w++;                                      \
 133   cc = what(t, c, d, a, b) ^ *w++;                                      \
 134   dd = what(t, d, a, b, c) ^ *w++;                                      \
 135 } while (0)
 136
 137 #define UNDO(what, t, aa, bb, cc, dd, a, b, c, d, w) do {               \
 138   aa = what(t, a, d, c, b) ^ *w++;                                      \
 139   bb = what(t, b, a, d, c) ^ *w++;                                      \
 140   cc = what(t, c, b, a, d) ^ *w++;                                      \
 141   dd = what(t, d, c, b, a) ^ *w++;                                      \
 142 } while (0)
 143
 144 static void simple_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 145 {
 146   uint32 a = s[0], b = s[1], c = s[2], d = s[3];
 147   uint32 aa, bb, cc, dd;
 148   const uint32 *w = k->w;
 149
 150   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
 151   aa = a; bb = b; cc = c; dd = d;
 152
 153   switch (k->nr) {
 154     case 14:
 155       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 156     case 13:
 157       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 158     case 12:
 159       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 160     case 11:
 161       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 162     case 10:
 163     default:
 164       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 165       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 166       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 167       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 168       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 169       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 170       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 171       DO(MIX, T, a, b, c, d, aa, bb, cc, dd, w);
 172       DO(MIX, T, aa, bb, cc, dd, a, b, c, d, w);
 173   }
 174   DO(SUB, S, a, b, c, d, aa, bb, cc, dd, w);
 175
 176   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
 177 }
 178
 179 static void simple_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
 180 {
 181   uint32 a = s[0], b = s[1], c = s[2], d = s[3];
 182   uint32 aa, bb, cc, dd;
 183   const uint32 *w = k->wi;
 184
 185   a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
 186   aa = a; bb = b; cc = c; dd = d;
 187
 188   switch (k->nr) {
 189     case 14:
 190       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 191     case 13:
 192       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 193     case 12:
 194       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 195     case 11:
 196       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 197     case 10:
 198     default:
 199       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 200       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 201       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 202       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 203       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 204       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 205       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 206       UNDO(MIX, TI, a, b, c, d, aa, bb, cc, dd, w);
 207       UNDO(MIX, TI, aa, bb, cc, dd, a, b, c, d, w);
 208   }
 209   UNDO(SUB, SI, a, b, c, d, aa, bb, cc, dd, w);
 210
 211   dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
 212 }
 213
 214 BLKC_TEST(RIJNDAEL, rijndael)
 215
 216 /*----- That's all, folks -------------------------------------------------*/