chiark - git - mdw - catacomb/blob - blkc.h

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Common definitions for block ciphers
   6  *
   7  * (c) 1999 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 #ifndef CATACOMB_BLKC_H
  31 #define CATACOMB_BLKC_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <assert.h>
  40
  41 #include <mLib/bits.h>
  42
  43 /*----- Theory of operation -----------------------------------------------*
  44  *
  45  * A block cipher has associated with it a triple, called PRE_CLASS, of the
  46  * form `(TYPE, ENDIAN, BITS)', where TYPE is either `N' (representing an
  47  * implemented bit size) or `X' (representing an unimplemented bit size,
  48  * causing loops to be compiled rather than unrolled code), ENDIAN is `B'
  49  * (big) or `L' (little), and BITS is the block size of the cipher in bits.
  50  */
  51
  52 /*----- Data movement macros ----------------------------------------------*/
  53
  54 /*
  55  * `The C preprocessor.  You will never find a more wretched hive of bogus
  56  * hackery.  We must be cautious.'
  57  */
  58
  59 /* --- General dispatch macros --- */
  60
  61 #define BLKC_DOGLUE(x, y) x ## y
  62 #define BLKC_GLUE(x, y) BLKC_DOGLUE(x, y)
  63 #define BLKC_APPLY(f, x) f x
  64 #define BLKC_FIRST(x, y, z) x
  65 #define BLKC_SECOND(x, y, z) y
  66 #define BLKC_THIRD(x, y, z) z
  67 #define BLKC_TYPE(PRE) BLKC_APPLY(BLKC_FIRST, PRE##_CLASS)
  68 #define BLKC_ENDIAN(PRE) BLKC_APPLY(BLKC_SECOND, PRE##_CLASS)
  69 #define BLKC_BITS(PRE) BLKC_APPLY(BLKC_THIRD, PRE##_CLASS)
  70
  71 #define BLKC_STORE_E(PRE) BLKC_GLUE(STORE32_, BLKC_ENDIAN(PRE))
  72 #define BLKC_LOAD_E(PRE) BLKC_GLUE(LOAD32_, BLKC_ENDIAN(PRE))
  73
  74 /* --- Interface macros --- */
  75
  76 #define BLKC_STORE(PRE, b, w)                                           \
  77   BLKC_GLUE(BLKC_STORE_, BLKC_TYPE(PRE))                                \
  78     (PRE, b, w, BLKC_STORE_E(PRE), BLKC_BITS(PRE))
  79
  80 #define BLKC_XSTORE(PRE, b, w, wx)                                      \
  81   BLKC_GLUE(BLKC_XSTORE_, BLKC_TYPE(PRE))                               \
  82     (PRE, b, w, wx, BLKC_STORE_E(PRE), BLKC_BITS(PRE))
  83
  84 #define BLKC_LOAD(PRE, w, b)                                            \
  85   BLKC_GLUE(BLKC_LOAD_, BLKC_TYPE(PRE))                                 \
  86     (PRE, w, b, BLKC_LOAD_E(PRE), BLKC_BITS(PRE))
  87
  88 #define BLKC_XLOAD(PRE, w, b)                                           \
  89   BLKC_GLUE(BLKC_XLOAD_, BLKC_TYPE(PRE))                                \
  90     (PRE, w, b, BLKC_LOAD_E(PRE), BLKC_BITS(PRE))
  91
  92 #define BLKC_MOVE(PRE, w, wx)                                           \
  93   BLKC_GLUE(BLKC_MOVE_, BLKC_TYPE(PRE))                                 \
  94     (PRE, w, wx, BLKC_BITS(PRE))
  95
  96 #define BLKC_XMOVE(PRE, w, wx)                                          \
  97   BLKC_GLUE(BLKC_XMOVE_, BLKC_TYPE(PRE))                                \
  98     (PRE, w, wx, BLKC_BITS(PRE))
  99
 100 #define BLKC_STEP(PRE, w)                                               \
 101   BLKC_GLUE(BLKC_STEP_X_, BLKC_ENDIAN(PRE))                             \
 102     (PRE, w)
 103
 104 #define BLKC_ZERO(PRE, w)                                               \
 105   BLKC_GLUE(BLKC_ZERO_, BLKC_TYPE(PRE))                                 \
 106     (PRE, w, BLKC_BITS(PRE))
 107
 108 #define BLKC_SET(PRE, w, x)                                             \
 109   BLKC_GLUE(BLKC_SET_X_, BLKC_ENDIAN(PRE))                              \
 110     (PRE, w, x)
 111
 112 #define BLKC_SHOW(PRE, tag, w) do {                                     \
 113   fputs(tag ": ", stdout);                                              \
 114   BLKC_SKEL_X(PRE, BLKC_W(w);, printf("%08x ", *_w++););                \
 115   fputc('\n', stdout);                                                  \
 116 } while (0)
 117
 118 /* --- General implementation skeleton --- */
 119
 120 #define BLKC_SKEL(PRE, decl, guts) do {                                 \
 121   decl                                                                  \
 122   guts                                                                  \
 123 } while (0)
 124
 125 #define BLKC_P(p) register octet *_p = (octet *)(p)
 126 #define BLKC_W(w) register uint32 *_w = (w)
 127 #define BLKC_WX(wx) register uint32 *_wx = (wx)
 128
 129 /* --- Implementation for unusual block sizes --- */
 130
 131 #define BLKC_SKEL_X(PRE, decl, guts)                                    \
 132   BLKC_SKEL(PRE, unsigned _i; decl,                                     \
 133             for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {                  \
 134               guts                                                      \
 135             })
 136
 137 #define BLKC_STORE_X(PRE, b, w, op, n)                                  \
 138   BLKC_SKEL_X(PRE, BLKC_P(b); const BLKC_W(w);,                         \
 139               op(_p, *_w); _p += 4; _w++; )
 140
 141 #define BLKC_XSTORE_X(PRE, b, w, wx, op, n)                             \
 142   BLKC_SKEL_X(PRE, BLKC_P(b); const BLKC_W(w); const BLKC_WX(wx);,      \
 143               op(_p, *_w ^ *_wx); _p += 4; _w++; _wx++; )
 144
 145 #define BLKC_LOAD_X(PRE, w, b, op, n)                                   \
 146   BLKC_SKEL_X(PRE, const BLKC_P(b); BLKC_W(w);,                         \
 147               *_w = op(_p); _p += 4; _w++; )
 148
 149 #define BLKC_XLOAD_X(PRE, w, b, op, n)                                  \
 150   BLKC_SKEL_X(PRE, const BLKC_P(b); BLKC_W(w);,                         \
 151               *_w ^= op(_p); _p += 4; _w++; )
 152
 153 #define BLKC_MOVE_X(PRE, w, wx, n)                                      \
 154   BLKC_SKEL_X(PRE, BLKC_W(w); const BLKC_WX(wx);,                       \
 155               *_w = *_wx; _w++; _wx++; )                                \
 156
 157 #define BLKC_XMOVE_X(PRE, w, wx, n)                                     \
 158   BLKC_SKEL_X(PRE, BLKC_W(w); const BLKC_WX(wx);,                       \
 159               *_w ^= *_wx; _w++; _wx++; )                               \
 160
 161 #define BLKC_ZERO_X(PRE, w, n)                                          \
 162   BLKC_SKEL_X(PRE, BLKC_W(w);, *_w++ = 0;)
 163
 164 #define BLKC_STEP_X_B(PRE, w) do {                                      \
 165   unsigned _i = PRE##_BLKSZ / 4; BLKC_W(w); uint32 _x = 0;              \
 166   while (_i && !_x) { _i--; _w[_i] = _x = U32(_w[_i] + 1); }            \
 167 } while (0)
 168
 169 #define BLKC_STEP_X_L(PRE, w) do {                                      \
 170   unsigned _i = 0; BLKC_W(w); uint32 _x = 0;                            \
 171   while (_i < PRE##_BLKSZ / 4 && !_x)                                   \
 172     { _w[_i] = _x = U32(_w[_i] + 1); _i++; }                            \
 173 } while (0)
 174
 175 #define BLKC_SET_X_B(PRE, w, x) do {                                    \
 176   unsigned _i; BLKC_W(w); unsigned long _x = x;                         \
 177   for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {                            \
 178     *_w++ = U32(_x);                                                    \
 179     _x = ((_x & ~MASK32) >> 16) >> 16;                                  \
 180   }                                                                     \
 181 } while (0)
 182
 183 #define BLKC_SET_X_L(PRE, w, x) do {                                    \
 184   unsigned _i; BLKC_W(w); unsigned long _x = x; _w += PRE##_BLKSZ / 4;  \
 185   for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {                            \
 186     *--_w = U32(_x);                                                    \
 187     _x = ((_x & ~MASK32) >> 16) >> 16;                                  \
 188   }                                                                     \
 189 } while (0)
 190
 191 /* --- Implementation for known block sizes --- */
 192
 193 #define BLKC_SKEL_64(PRE, decl, op, guts)                               \
 194   BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1);)
 195
 196 #define BLKC_SKEL_96(PRE, decl, op, guts)                               \
 197   BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2);)
 198
 199 #define BLKC_SKEL_128(PRE, decl, op, guts)                              \
 200   BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3);)
 201
 202 #define BLKC_SKEL_192(PRE, decl, op, guts)                              \
 203   BLKC_SKEL(PRE, decl,                                                  \
 204             guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3);         \
 205             guts(op, 4); guts(op, 5);)
 206
 207 #define BLKC_SKEL_256(PRE, decl, op, guts)                              \
 208   BLKC_SKEL(PRE, decl,                                                  \
 209             guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3);         \
 210             guts(op, 4); guts(op, 5); guts(op, 6); guts(op, 7);)
 211
 212 #define BLKC_STORE_GUTS(op, i) op(_p + 4 * i, _w[i])
 213 #define BLKC_XSTORE_GUTS(op, i) op(_p + 4 * i, _w[i] ^ _wx[i])
 214 #define BLKC_LOAD_GUTS(op, i) _w[i] = op(_p + 4 * i)
 215 #define BLKC_XLOAD_GUTS(op, i) _w[i] ^= op(_p + 4 * i)
 216 #define BLKC_MOVE_GUTS(op, i) _w[i] = _wx[i]
 217 #define BLKC_XMOVE_GUTS(op, i) _w[i] ^= _wx[i]
 218 #define BLKC_ZERO_GUTS(op, i) _w[i] = 0
 219
 220 #define BLKC_STORE_N(PRE, b, w, op, n)                                  \
 221   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 222     (PRE, BLKC_P(b); const BLKC_W(w);, op, BLKC_STORE_GUTS)
 223
 224 #define BLKC_XSTORE_N(PRE, b, w, wx, op, n)                             \
 225   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 226     (PRE, BLKC_P(b); const BLKC_W(w); const BLKC_WX(wx);,               \
 227      op, BLKC_XSTORE_GUTS)
 228
 229 #define BLKC_LOAD_N(PRE, w, b, op, n)                                   \
 230   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 231     (PRE, const BLKC_P(b); BLKC_W(w);, op, BLKC_LOAD_GUTS)
 232
 233 #define BLKC_XLOAD_N(PRE, w, b, op, n)                                  \
 234   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 235     (PRE, const BLKC_P(b); BLKC_W(w);, op, BLKC_XLOAD_GUTS)
 236
 237 #define BLKC_MOVE_N(PRE, w, wx, n)                                      \
 238   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 239     (PRE, BLKC_W(w); const BLKC_WX(wx);, op, BLKC_MOVE_GUTS)
 240
 241 #define BLKC_ZERO_N(PRE, w, n)                                          \
 242   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 243     (PRE, BLKC_W(w); , op, BLKC_ZERO_GUTS)
 244
 245 #define BLKC_XMOVE_N(PRE, w, wx, n)                                     \
 246   BLKC_GLUE(BLKC_SKEL_, n)                                              \
 247     (PRE, BLKC_W(w); const BLKC_WX(wx);, op, BLKC_XMOVE_GUTS)
 248
 249 /*----- Test rig for block ciphers ----------------------------------------*/
 250
 251 /* --- @BLKC_TEST@ --- *
 252  *
 253  * Arguments:   @PRE@, @pre@ = prefixes for cipher-specific definitions
 254  *
 255  * Use:         Standard test rig for block ciphers.
 256  */
 257
 258 #ifdef TEST_RIG
 259
 260 #include <string.h>
 261
 262 #include <mLib/quis.h>
 263 #include <mLib/testrig.h>
 264
 265 #define BLKC_VERIFY(PRE, pre)                                           \
 266                                                                         \
 267 static int pre##_verify(dstr *v)                                        \
 268 {                                                                       \
 269   pre##_ctx k;                                                          \
 270   uint32 p[PRE##_BLKSZ / 4];                                            \
 271   uint32 c[PRE##_BLKSZ / 4];                                            \
 272   uint32 d[PRE##_BLKSZ / 4];                                            \
 273   dstr b = DSTR_INIT;                                                   \
 274   int ok = 1;                                                           \
 275                                                                         \
 276   /* --- Initialize the key buffer --- */                               \
 277                                                                         \
 278   dstr_ensure(&b, PRE##_BLKSZ);                                         \
 279   b.len = PRE##_BLKSZ;                                                  \
 280   pre##_init(&k, v[0].buf, v[0].len);                                   \
 281   BLKC_LOAD(PRE, p, v[1].buf);                                          \
 282   BLKC_LOAD(PRE, c, v[2].buf);                                          \
 283                                                                         \
 284   /* --- Test encryption --- */                                         \
 285                                                                         \
 286   BLKC_MOVE(PRE, d, p);                                                 \
 287   pre##_eblk(&k, d, d);                                                 \
 288   BLKC_STORE(PRE, b.buf, d);                                            \
 289   if (memcmp(b.buf, v[2].buf, PRE##_BLKSZ)) {                           \
 290     ok = 0;                                                             \
 291     printf("\nfail encryption:"                                         \
 292            "\n\tkey        = ");                                        \
 293     type_hex.dump(&v[0], stdout);                                       \
 294     printf("\n\tplaintext  = "); type_hex.dump(&v[1], stdout);          \
 295     printf("\n\texpected   = "); type_hex.dump(&v[2], stdout);          \
 296     printf("\n\tcalculated = "); type_hex.dump(&b, stdout);             \
 297     putchar('\n');                                                      \
 298   }                                                                     \
 299                                                                         \
 300   /* --- Test decryption --- */                                         \
 301                                                                         \
 302   BLKC_MOVE(PRE, d, c);                                                 \
 303   pre##_dblk(&k, d, d);                                                 \
 304   BLKC_STORE(PRE, b.buf, d);                                            \
 305   if (memcmp(b.buf, v[1].buf, PRE##_BLKSZ)) {                           \
 306     ok = 0;                                                             \
 307     printf("\nfail decryption:"                                         \
 308            "\n\tkey        = ");                                        \
 309     type_hex.dump(&v[0], stdout);                                       \
 310     printf("\n\tciphertext = "); type_hex.dump(&v[2], stdout);          \
 311     printf("\n\texpected   = "); type_hex.dump(&v[1], stdout);          \
 312     printf("\n\tcalculated = "); type_hex.dump(&b, stdout);             \
 313     putchar('\n');                                                      \
 314   }                                                                     \
 315                                                                         \
 316   /* --- Return --- */                                                  \
 317                                                                         \
 318   return (ok);                                                          \
 319 }
 320
 321 #define BLKC_TEST(PRE, pre)                                             \
 322                                                                         \
 323 BLKC_VERIFY(PRE, pre)                                                   \
 324                                                                         \
 325 static const test_chunk defs[] = {                                      \
 326   { #pre, pre##_verify, { &type_hex, &type_hex, &type_hex, 0 } },       \
 327   { 0, 0, { 0 } }                                                       \
 328 };                                                                      \
 329                                                                         \
 330 int main(int argc, char *argv[])                                        \
 331 {                                                                       \
 332   test_run(argc, argv, defs, SRCDIR"/tests/" #pre);                     \
 333   return (0);                                                           \
 334 }
 335
 336 #else
 337 #  define BLKC_VERIFY(PRE, pre)
 338 #  define BLKC_TEST(PRE, pre)
 339 #endif
 340
 341 /*----- That's all, folks -------------------------------------------------*/
 342
 343 #ifdef __cplusplus
 344   }
 345 #endif
 346
 347 #endif