sys/crypto/rijndael/rijndael-alg-fst.c

   1 /*      $FreeBSD: src/sys/crypto/rijndael/rijndael-alg-fst.c,v 1.3.2.1 2001/07/03 11:01:35 ume Exp $    */
   2 /*      $KAME: rijndael-alg-fst.c,v 1.7 2001/05/27 00:23:23 itojun Exp $        */
   3
   4 /*
   5  * rijndael-alg-fst.c   v2.3   April '2000
   6  *
   7  * Optimised ANSI C code
   8  *
   9  * authors: v1.0: Antoon Bosselaers
  10  *          v2.0: Vincent Rijmen
  11  *          v2.3: Paulo Barreto
  12  *
  13  * This code is placed in the public domain.
  14  */
  15
  16 #include <sys/cdefs.h>
  17 #include <sys/types.h>
  18 #ifdef _KERNEL
  19 #include <sys/systm.h>
  20 #else
  21 #include <string.h>
  22 #endif
  23 #include <crypto/rijndael/rijndael-alg-fst.h>
  24 #include <crypto/rijndael/rijndael_local.h>
  25
  26 #include <crypto/rijndael/boxes-fst.dat>
  27
  28 int rijndaelKeySched(word8 k[MAXKC][4], word8 W[MAXROUNDS+1][4][4], int ROUNDS) {
  29         /* Calculate the necessary round keys
  30          * The number of calculations depends on keyBits and blockBits
  31          */
  32         int j, r, t, rconpointer = 0;
  33         union {
  34                 word8   x8[MAXKC][4];
  35                 word32  x32[MAXKC];
  36         } xtk;
  37 #define tk      xtk.x8
  38         int KC = ROUNDS - 6;
  39
  40         for (j = KC-1; j >= 0; j--) {
  41                 *((word32*)tk[j]) = *((word32*)k[j]);
  42         }
  43         r = 0;
  44         t = 0;
  45         /* copy values into round key array */
  46         for (j = 0; (j < KC) && (r < ROUNDS + 1); ) {
  47                 for (; (j < KC) && (t < 4); j++, t++) {
  48                         *((word32*)W[r][t]) = *((word32*)tk[j]);
  49                 }
  50                 if (t == 4) {
  51                         r++;
  52                         t = 0;
  53                 }
  54         }
  55
  56         while (r < ROUNDS + 1) { /* while not enough round key material calculated */
  57                 /* calculate new values */
  58                 tk[0][0] ^= S[tk[KC-1][1]];
  59                 tk[0][1] ^= S[tk[KC-1][2]];
  60                 tk[0][2] ^= S[tk[KC-1][3]];
  61                 tk[0][3] ^= S[tk[KC-1][0]];
  62                 tk[0][0] ^= rcon[rconpointer++];
  63
  64                 if (KC != 8) {
  65                         for (j = 1; j < KC; j++) {
  66                                 *((word32*)tk[j]) ^= *((word32*)tk[j-1]);
  67                         }
  68                 } else {
  69                         for (j = 1; j < KC/2; j++) {
  70                                 *((word32*)tk[j]) ^= *((word32*)tk[j-1]);
  71                         }
  72                         tk[KC/2][0] ^= S[tk[KC/2 - 1][0]];
  73                         tk[KC/2][1] ^= S[tk[KC/2 - 1][1]];
  74                         tk[KC/2][2] ^= S[tk[KC/2 - 1][2]];
  75                         tk[KC/2][3] ^= S[tk[KC/2 - 1][3]];
  76                         for (j = KC/2 + 1; j < KC; j++) {
  77                                 *((word32*)tk[j]) ^= *((word32*)tk[j-1]);
  78                         }
  79                 }
  80                 /* copy values into round key array */
  81                 for (j = 0; (j < KC) && (r < ROUNDS + 1); ) {
  82                         for (; (j < KC) && (t < 4); j++, t++) {
  83                                 *((word32*)W[r][t]) = *((word32*)tk[j]);
  84                         }
  85                         if (t == 4) {
  86                                 r++;
  87                                 t = 0;
  88                         }
  89                 }
  90         }
  91         return 0;
  92 #undef tk
  93 }
  94
  95 int rijndaelKeyEncToDec(word8 W[MAXROUNDS+1][4][4], int ROUNDS) {
  96         int r;
  97         word8 *w;
  98
  99         for (r = 1; r < ROUNDS; r++) {
 100                 w = W[r][0];
 101                 *((word32*)w) =
 102                           *((const word32*)U1[w[0]])
 103                         ^ *((const word32*)U2[w[1]])
 104                         ^ *((const word32*)U3[w[2]])
 105                         ^ *((const word32*)U4[w[3]]);
 106
 107                 w = W[r][1];
 108                 *((word32*)w) =
 109                           *((const word32*)U1[w[0]])
 110                         ^ *((const word32*)U2[w[1]])
 111                         ^ *((const word32*)U3[w[2]])
 112                         ^ *((const word32*)U4[w[3]]);
 113
 114                 w = W[r][2];
 115                 *((word32*)w) =
 116                           *((const word32*)U1[w[0]])
 117                         ^ *((const word32*)U2[w[1]])
 118                         ^ *((const word32*)U3[w[2]])
 119                         ^ *((const word32*)U4[w[3]]);
 120
 121                 w = W[r][3];
 122                 *((word32*)w) =
 123                           *((const word32*)U1[w[0]])
 124                         ^ *((const word32*)U2[w[1]])
 125                         ^ *((const word32*)U3[w[2]])
 126                         ^ *((const word32*)U4[w[3]]);
 127         }
 128         return 0;
 129 }
 130
 131 /**
 132  * Encrypt a single block.
 133  */
 134 int rijndaelEncrypt(word8 in[16], word8 out[16], word8 rk[MAXROUNDS+1][4][4], int ROUNDS) {
 135         int r;
 136         union {
 137                 word8   x8[16];
 138                 word32  x32[4];
 139         } xa, xb;
 140 #define a       xa.x8
 141 #define b       xb.x8
 142         union {
 143                 word8   x8[4][4];
 144                 word32  x32[4];
 145         } xtemp;
 146 #define temp    xtemp.x8
 147
 148     memcpy(a, in, sizeof a);
 149
 150     *((word32*)temp[0]) = *((word32*)(a   )) ^ *((word32*)rk[0][0]);
 151     *((word32*)temp[1]) = *((word32*)(a+ 4)) ^ *((word32*)rk[0][1]);
 152     *((word32*)temp[2]) = *((word32*)(a+ 8)) ^ *((word32*)rk[0][2]);
 153     *((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[0][3]);
 154     *((word32*)(b    )) = *((const word32*)T1[temp[0][0]])
 155                                         ^ *((const word32*)T2[temp[1][1]])
 156                                         ^ *((const word32*)T3[temp[2][2]])
 157                                         ^ *((const word32*)T4[temp[3][3]]);
 158     *((word32*)(b + 4)) = *((const word32*)T1[temp[1][0]])
 159                                         ^ *((const word32*)T2[temp[2][1]])
 160                                         ^ *((const word32*)T3[temp[3][2]])
 161                                         ^ *((const word32*)T4[temp[0][3]]);
 162     *((word32*)(b + 8)) = *((const word32*)T1[temp[2][0]])
 163                                         ^ *((const word32*)T2[temp[3][1]])
 164                                         ^ *((const word32*)T3[temp[0][2]])
 165                                         ^ *((const word32*)T4[temp[1][3]]);
 166     *((word32*)(b +12)) = *((const word32*)T1[temp[3][0]])
 167                                         ^ *((const word32*)T2[temp[0][1]])
 168                                         ^ *((const word32*)T3[temp[1][2]])
 169                                         ^ *((const word32*)T4[temp[2][3]]);
 170         for (r = 1; r < ROUNDS-1; r++) {
 171                 *((word32*)temp[0]) = *((word32*)(b   )) ^ *((word32*)rk[r][0]);
 172                 *((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[r][1]);
 173                 *((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[r][2]);
 174                 *((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
 175
 176                 *((word32*)(b    )) = *((const word32*)T1[temp[0][0]])
 177                                         ^ *((const word32*)T2[temp[1][1]])
 178                                         ^ *((const word32*)T3[temp[2][2]])
 179                                         ^ *((const word32*)T4[temp[3][3]]);
 180                 *((word32*)(b + 4)) = *((const word32*)T1[temp[1][0]])
 181                                         ^ *((const word32*)T2[temp[2][1]])
 182                                         ^ *((const word32*)T3[temp[3][2]])
 183                                         ^ *((const word32*)T4[temp[0][3]]);
 184                 *((word32*)(b + 8)) = *((const word32*)T1[temp[2][0]])
 185                                         ^ *((const word32*)T2[temp[3][1]])
 186                                         ^ *((const word32*)T3[temp[0][2]])
 187                                         ^ *((const word32*)T4[temp[1][3]]);
 188                 *((word32*)(b +12)) = *((const word32*)T1[temp[3][0]])
 189                                         ^ *((const word32*)T2[temp[0][1]])
 190                                         ^ *((const word32*)T3[temp[1][2]])
 191                                         ^ *((const word32*)T4[temp[2][3]]);
 192         }
 193         /* last round is special */
 194         *((word32*)temp[0]) = *((word32*)(b   )) ^ *((word32*)rk[ROUNDS-1][0]);
 195         *((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[ROUNDS-1][1]);
 196         *((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[ROUNDS-1][2]);
 197         *((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[ROUNDS-1][3]);
 198         b[ 0] = T1[temp[0][0]][1];
 199         b[ 1] = T1[temp[1][1]][1];
 200         b[ 2] = T1[temp[2][2]][1];
 201         b[ 3] = T1[temp[3][3]][1];
 202         b[ 4] = T1[temp[1][0]][1];
 203         b[ 5] = T1[temp[2][1]][1];
 204         b[ 6] = T1[temp[3][2]][1];
 205         b[ 7] = T1[temp[0][3]][1];
 206         b[ 8] = T1[temp[2][0]][1];
 207         b[ 9] = T1[temp[3][1]][1];
 208         b[10] = T1[temp[0][2]][1];
 209         b[11] = T1[temp[1][3]][1];
 210         b[12] = T1[temp[3][0]][1];
 211         b[13] = T1[temp[0][1]][1];
 212         b[14] = T1[temp[1][2]][1];
 213         b[15] = T1[temp[2][3]][1];
 214         *((word32*)(b   )) ^= *((word32*)rk[ROUNDS][0]);
 215         *((word32*)(b+ 4)) ^= *((word32*)rk[ROUNDS][1]);
 216         *((word32*)(b+ 8)) ^= *((word32*)rk[ROUNDS][2]);
 217         *((word32*)(b+12)) ^= *((word32*)rk[ROUNDS][3]);
 218
 219         memcpy(out, b, sizeof b /* XXX out */);
 220
 221         return 0;
 222 #undef a
 223 #undef b
 224 #undef temp
 225 }
 226
 227 #ifdef INTERMEDIATE_VALUE_KAT
 228 /**
 229  * Encrypt only a certain number of rounds.
 230  * Only used in the Intermediate Value Known Answer Test.
 231  */
 232 int rijndaelEncryptRound(word8 a[4][4], word8 rk[MAXROUNDS+1][4][4], int ROUNDS, int rounds) {
 233         int r;
 234         word8 temp[4][4];
 235
 236         /* make number of rounds sane */
 237         if (rounds > ROUNDS) {
 238                 rounds = ROUNDS;
 239         }
 240
 241         *((word32*)a[0]) = *((word32*)a[0]) ^ *((word32*)rk[0][0]);
 242         *((word32*)a[1]) = *((word32*)a[1]) ^ *((word32*)rk[0][1]);
 243         *((word32*)a[2]) = *((word32*)a[2]) ^ *((word32*)rk[0][2]);
 244         *((word32*)a[3]) = *((word32*)a[3]) ^ *((word32*)rk[0][3]);
 245
 246         for (r = 1; (r <= rounds) && (r < ROUNDS); r++) {
 247                 *((word32*)temp[0]) = *((word32*)T1[a[0][0]])
 248            ^ *((word32*)T2[a[1][1]])
 249            ^ *((word32*)T3[a[2][2]])
 250            ^ *((word32*)T4[a[3][3]]);
 251                 *((word32*)temp[1]) = *((word32*)T1[a[1][0]])
 252            ^ *((word32*)T2[a[2][1]])
 253            ^ *((word32*)T3[a[3][2]])
 254            ^ *((word32*)T4[a[0][3]]);
 255                 *((word32*)temp[2]) = *((word32*)T1[a[2][0]])
 256            ^ *((word32*)T2[a[3][1]])
 257            ^ *((word32*)T3[a[0][2]])
 258            ^ *((word32*)T4[a[1][3]]);
 259                 *((word32*)temp[3]) = *((word32*)T1[a[3][0]])
 260            ^ *((word32*)T2[a[0][1]])
 261            ^ *((word32*)T3[a[1][2]])
 262            ^ *((word32*)T4[a[2][3]]);
 263                 *((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[r][0]);
 264                 *((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[r][1]);
 265                 *((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[r][2]);
 266                 *((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[r][3]);
 267         }
 268         if (rounds == ROUNDS) {
 269                 /* last round is special */
 270                 temp[0][0] = T1[a[0][0]][1];
 271                 temp[0][1] = T1[a[1][1]][1];
 272                 temp[0][2] = T1[a[2][2]][1];
 273                 temp[0][3] = T1[a[3][3]][1];
 274                 temp[1][0] = T1[a[1][0]][1];
 275                 temp[1][1] = T1[a[2][1]][1];
 276                 temp[1][2] = T1[a[3][2]][1];
 277                 temp[1][3] = T1[a[0][3]][1];
 278                 temp[2][0] = T1[a[2][0]][1];
 279                 temp[2][1] = T1[a[3][1]][1];
 280                 temp[2][2] = T1[a[0][2]][1];
 281                 temp[2][3] = T1[a[1][3]][1];
 282                 temp[3][0] = T1[a[3][0]][1];
 283                 temp[3][1] = T1[a[0][1]][1];
 284                 temp[3][2] = T1[a[1][2]][1];
 285                 temp[3][3] = T1[a[2][3]][1];
 286                 *((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[ROUNDS][0]);
 287                 *((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[ROUNDS][1]);
 288                 *((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[ROUNDS][2]);
 289                 *((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[ROUNDS][3]);
 290         }
 291
 292         return 0;
 293 }
 294 #endif /* INTERMEDIATE_VALUE_KAT */
 295
 296 /**
 297  * Decrypt a single block.
 298  */
 299 int rijndaelDecrypt(word8 in[16], word8 out[16], word8 rk[MAXROUNDS+1][4][4], int ROUNDS) {
 300         int r;
 301         union {
 302                 word8   x8[16];
 303                 word32  x32[4];
 304         } xa, xb;
 305 #define a       xa.x8
 306 #define b       xb.x8
 307         union {
 308                 word8   x8[4][4];
 309                 word32  x32[4];
 310         } xtemp;
 311 #define temp    xtemp.x8
 312
 313     memcpy(a, in, sizeof a);
 314
 315     *((word32*)temp[0]) = *((word32*)(a   )) ^ *((word32*)rk[ROUNDS][0]);
 316     *((word32*)temp[1]) = *((word32*)(a+ 4)) ^ *((word32*)rk[ROUNDS][1]);
 317     *((word32*)temp[2]) = *((word32*)(a+ 8)) ^ *((word32*)rk[ROUNDS][2]);
 318     *((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[ROUNDS][3]);
 319
 320     *((word32*)(b   )) = *((const word32*)T5[temp[0][0]])
 321            ^ *((const word32*)T6[temp[3][1]])
 322            ^ *((const word32*)T7[temp[2][2]])
 323            ^ *((const word32*)T8[temp[1][3]]);
 324         *((word32*)(b+ 4)) = *((const word32*)T5[temp[1][0]])
 325            ^ *((const word32*)T6[temp[0][1]])
 326            ^ *((const word32*)T7[temp[3][2]])
 327            ^ *((const word32*)T8[temp[2][3]]);
 328         *((word32*)(b+ 8)) = *((const word32*)T5[temp[2][0]])
 329            ^ *((const word32*)T6[temp[1][1]])
 330            ^ *((const word32*)T7[temp[0][2]])
 331            ^ *((const word32*)T8[temp[3][3]]);
 332         *((word32*)(b+12)) = *((const word32*)T5[temp[3][0]])
 333            ^ *((const word32*)T6[temp[2][1]])
 334            ^ *((const word32*)T7[temp[1][2]])
 335            ^ *((const word32*)T8[temp[0][3]]);
 336         for (r = ROUNDS-1; r > 1; r--) {
 337                 *((word32*)temp[0]) = *((word32*)(b   )) ^ *((word32*)rk[r][0]);
 338                 *((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[r][1]);
 339                 *((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[r][2]);
 340                 *((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
 341                 *((word32*)(b   )) = *((const word32*)T5[temp[0][0]])
 342            ^ *((const word32*)T6[temp[3][1]])
 343            ^ *((const word32*)T7[temp[2][2]])
 344            ^ *((const word32*)T8[temp[1][3]]);
 345                 *((word32*)(b+ 4)) = *((const word32*)T5[temp[1][0]])
 346            ^ *((const word32*)T6[temp[0][1]])
 347            ^ *((const word32*)T7[temp[3][2]])
 348            ^ *((const word32*)T8[temp[2][3]]);
 349                 *((word32*)(b+ 8)) = *((const word32*)T5[temp[2][0]])
 350            ^ *((const word32*)T6[temp[1][1]])
 351            ^ *((const word32*)T7[temp[0][2]])
 352            ^ *((const word32*)T8[temp[3][3]]);
 353                 *((word32*)(b+12)) = *((const word32*)T5[temp[3][0]])
 354            ^ *((const word32*)T6[temp[2][1]])
 355            ^ *((const word32*)T7[temp[1][2]])
 356            ^ *((const word32*)T8[temp[0][3]]);
 357         }
 358         /* last round is special */
 359         *((word32*)temp[0]) = *((word32*)(b   )) ^ *((word32*)rk[1][0]);
 360         *((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[1][1]);
 361         *((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[1][2]);
 362         *((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[1][3]);
 363         b[ 0] = S5[temp[0][0]];
 364         b[ 1] = S5[temp[3][1]];
 365         b[ 2] = S5[temp[2][2]];
 366         b[ 3] = S5[temp[1][3]];
 367         b[ 4] = S5[temp[1][0]];
 368         b[ 5] = S5[temp[0][1]];
 369         b[ 6] = S5[temp[3][2]];
 370         b[ 7] = S5[temp[2][3]];
 371         b[ 8] = S5[temp[2][0]];
 372         b[ 9] = S5[temp[1][1]];
 373         b[10] = S5[temp[0][2]];
 374         b[11] = S5[temp[3][3]];
 375         b[12] = S5[temp[3][0]];
 376         b[13] = S5[temp[2][1]];
 377         b[14] = S5[temp[1][2]];
 378         b[15] = S5[temp[0][3]];
 379         *((word32*)(b   )) ^= *((word32*)rk[0][0]);
 380         *((word32*)(b+ 4)) ^= *((word32*)rk[0][1]);
 381         *((word32*)(b+ 8)) ^= *((word32*)rk[0][2]);
 382         *((word32*)(b+12)) ^= *((word32*)rk[0][3]);
 383
 384         memcpy(out, b, sizeof b /* XXX out */);
 385
 386         return 0;
 387 #undef a
 388 #undef b
 389 #undef temp
 390 }
 391
 392
 393 #ifdef INTERMEDIATE_VALUE_KAT
 394 /**
 395  * Decrypt only a certain number of rounds.
 396  * Only used in the Intermediate Value Known Answer Test.
 397  * Operations rearranged such that the intermediate values
 398  * of decryption correspond with the intermediate values
 399  * of encryption.
 400  */
 401 int rijndaelDecryptRound(word8 a[4][4], word8 rk[MAXROUNDS+1][4][4], int ROUNDS, int rounds) {
 402         int r, i;
 403         word8 temp[4], shift;
 404
 405         /* make number of rounds sane */
 406         if (rounds > ROUNDS) {
 407                 rounds = ROUNDS;
 408         }
 409     /* first round is special: */
 410         *(word32 *)a[0] ^= *(word32 *)rk[ROUNDS][0];
 411         *(word32 *)a[1] ^= *(word32 *)rk[ROUNDS][1];
 412         *(word32 *)a[2] ^= *(word32 *)rk[ROUNDS][2];
 413         *(word32 *)a[3] ^= *(word32 *)rk[ROUNDS][3];
 414         for (i = 0; i < 4; i++) {
 415                 a[i][0] = Si[a[i][0]];
 416                 a[i][1] = Si[a[i][1]];
 417                 a[i][2] = Si[a[i][2]];
 418                 a[i][3] = Si[a[i][3]];
 419         }
 420         for (i = 1; i < 4; i++) {
 421                 shift = (4 - i) & 3;
 422                 temp[0] = a[(0 + shift) & 3][i];
 423                 temp[1] = a[(1 + shift) & 3][i];
 424                 temp[2] = a[(2 + shift) & 3][i];
 425                 temp[3] = a[(3 + shift) & 3][i];
 426                 a[0][i] = temp[0];
 427                 a[1][i] = temp[1];
 428                 a[2][i] = temp[2];
 429                 a[3][i] = temp[3];
 430         }
 431         /* ROUNDS-1 ordinary rounds */
 432         for (r = ROUNDS-1; r > rounds; r--) {
 433                 *(word32 *)a[0] ^= *(word32 *)rk[r][0];
 434                 *(word32 *)a[1] ^= *(word32 *)rk[r][1];
 435                 *(word32 *)a[2] ^= *(word32 *)rk[r][2];
 436                 *(word32 *)a[3] ^= *(word32 *)rk[r][3];
 437
 438                 *((word32*)a[0]) =
 439                           *((word32*)U1[a[0][0]])
 440                         ^ *((word32*)U2[a[0][1]])
 441                         ^ *((word32*)U3[a[0][2]])
 442                         ^ *((word32*)U4[a[0][3]]);
 443
 444                 *((word32*)a[1]) =
 445                           *((word32*)U1[a[1][0]])
 446                         ^ *((word32*)U2[a[1][1]])
 447                         ^ *((word32*)U3[a[1][2]])
 448                         ^ *((word32*)U4[a[1][3]]);
 449
 450                 *((word32*)a[2]) =
 451                           *((word32*)U1[a[2][0]])
 452                         ^ *((word32*)U2[a[2][1]])
 453                         ^ *((word32*)U3[a[2][2]])
 454                         ^ *((word32*)U4[a[2][3]]);
 455
 456                 *((word32*)a[3]) =
 457                           *((word32*)U1[a[3][0]])
 458                         ^ *((word32*)U2[a[3][1]])
 459                         ^ *((word32*)U3[a[3][2]])
 460                         ^ *((word32*)U4[a[3][3]]);
 461                 for (i = 0; i < 4; i++) {
 462                         a[i][0] = Si[a[i][0]];
 463                         a[i][1] = Si[a[i][1]];
 464                         a[i][2] = Si[a[i][2]];
 465                         a[i][3] = Si[a[i][3]];
 466                 }
 467                 for (i = 1; i < 4; i++) {
 468                         shift = (4 - i) & 3;
 469                         temp[0] = a[(0 + shift) & 3][i];
 470                         temp[1] = a[(1 + shift) & 3][i];
 471                         temp[2] = a[(2 + shift) & 3][i];
 472                         temp[3] = a[(3 + shift) & 3][i];
 473                         a[0][i] = temp[0];
 474                         a[1][i] = temp[1];
 475                         a[2][i] = temp[2];
 476                         a[3][i] = temp[3];
 477                 }
 478         }
 479         if (rounds == 0) {
 480                 /* End with the extra key addition */
 481                 *(word32 *)a[0] ^= *(word32 *)rk[0][0];
 482                 *(word32 *)a[1] ^= *(word32 *)rk[0][1];
 483                 *(word32 *)a[2] ^= *(word32 *)rk[0][2];
 484                 *(word32 *)a[3] ^= *(word32 *)rk[0][3];
 485         }
 486         return 0;
 487 }
 488 #endif /* INTERMEDIATE_VALUE_KAT */