arch/i386/crypto/aes.c

   1 /*
   2  *
   3  * Glue Code for optimized 586 assembler version of AES
   4  *
   5  * Copyright (c) 2002, Dr Brian Gladman <>, Worcester, UK.
   6  * All rights reserved.
   7  *
   8  * LICENSE TERMS
   9  *
  10  * The free distribution and use of this software in both source and binary
  11  * form is allowed (with or without changes) provided that:
  12  *
  13  *   1. distributions of this source code include the above copyright
  14  *      notice, this list of conditions and the following disclaimer;
  15  *
  16  *   2. distributions in binary form include the above copyright
  17  *      notice, this list of conditions and the following disclaimer
  18  *      in the documentation and/or other associated materials;
  19  *
  20  *   3. the copyright holder's name is not used to endorse products
  21  *      built using this software without specific written permission.
  22  *
  23  * ALTERNATIVELY, provided that this notice is retained in full, this product
  24  * may be distributed under the terms of the GNU General Public License (GPL),
  25  * in which case the provisions of the GPL apply INSTEAD OF those given above.
  26  *
  27  * DISCLAIMER
  28  *
  29  * This software is provided 'as is' with no explicit or implied warranties
  30  * in respect of its properties, including, but not limited to, correctness
  31  * and/or fitness for purpose.
  32  *
  33  * Copyright (c) 2003, Adam J. Richter <adam@yggdrasil.com> (conversion to
  34  * 2.5 API).
  35  * Copyright (c) 2003, 2004 Fruhwirth Clemens <clemens@endorphin.org>
  36  * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  37  *
  38  */
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/types.h>
  43 #include <linux/crypto.h>
  44 #include <linux/linkage.h>
  45
  46 asmlinkage void aes_enc_blk(const u8 *src, u8 *dst, void *ctx);
  47 asmlinkage void aes_dec_blk(const u8 *src, u8 *dst, void *ctx);
  48
  49 #define AES_MIN_KEY_SIZE        16
  50 #define AES_MAX_KEY_SIZE        32
  51 #define AES_BLOCK_SIZE          16
  52 #define AES_KS_LENGTH           4 * AES_BLOCK_SIZE
  53 #define RC_LENGTH               29
  54
  55 struct aes_ctx {
  56         u32 ekey[AES_KS_LENGTH];
  57         u32 rounds;
  58         u32 dkey[AES_KS_LENGTH];
  59 };
  60
  61 #define WPOLY 0x011b
  62 #define u32_in(x) le32_to_cpu(*(const u32 *)(x))
  63 #define bytes2word(b0, b1, b2, b3)  \
  64         (((u32)(b3) << 24) | ((u32)(b2) << 16) | ((u32)(b1) << 8) | (b0))
  65
  66 /* define the finite field multiplies required for Rijndael */
  67 #define f2(x) ((x) ? pow[log[x] + 0x19] : 0)
  68 #define f3(x) ((x) ? pow[log[x] + 0x01] : 0)
  69 #define f9(x) ((x) ? pow[log[x] + 0xc7] : 0)
  70 #define fb(x) ((x) ? pow[log[x] + 0x68] : 0)
  71 #define fd(x) ((x) ? pow[log[x] + 0xee] : 0)
  72 #define fe(x) ((x) ? pow[log[x] + 0xdf] : 0)
  73 #define fi(x) ((x) ?   pow[255 - log[x]]: 0)
  74
  75 static inline u32 upr(u32 x, int n)
  76 {
  77         return (x << 8 * n) | (x >> (32 - 8 * n));
  78 }
  79
  80 static inline u8 bval(u32 x, int n)
  81 {
  82         return x >> 8 * n;
  83 }
  84
  85 /* The forward and inverse affine transformations used in the S-box */
  86 #define fwd_affine(x) \
  87         (w = (u32)x, w ^= (w<<1)^(w<<2)^(w<<3)^(w<<4), 0x63^(u8)(w^(w>>8)))
  88
  89 #define inv_affine(x) \
  90         (w = (u32)x, w = (w<<1)^(w<<3)^(w<<6), 0x05^(u8)(w^(w>>8)))
  91
  92 static u32 rcon_tab[RC_LENGTH];
  93
  94 u32 ft_tab[4][256];
  95 u32 fl_tab[4][256];
  96 static u32 ls_tab[4][256];
  97 static u32 im_tab[4][256];
  98 u32 il_tab[4][256];
  99 u32 it_tab[4][256];
 100
 101 static void gen_tabs(void)
 102 {
 103         u32 i, w;
 104         u8 pow[512], log[256];
 105
 106         /*
 107          * log and power tables for GF(2^8) finite field with
 108          * WPOLY as modular polynomial - the simplest primitive
 109          * root is 0x03, used here to generate the tables.
 110          */
 111         i = 0; w = 1;
 112
 113         do {
 114                 pow[i] = (u8)w;
 115                 pow[i + 255] = (u8)w;
 116                 log[w] = (u8)i++;
 117                 w ^=  (w << 1) ^ (w & 0x80 ? WPOLY : 0);
 118         } while (w != 1);
 119
 120         for(i = 0, w = 1; i < RC_LENGTH; ++i) {
 121                 rcon_tab[i] = bytes2word(w, 0, 0, 0);
 122                 w = f2(w);
 123         }
 124
 125         for(i = 0; i < 256; ++i) {
 126                 u8 b;
 127
 128                 b = fwd_affine(fi((u8)i));
 129                 w = bytes2word(f2(b), b, b, f3(b));
 130
 131                 /* tables for a normal encryption round */
 132                 ft_tab[0][i] = w;
 133                 ft_tab[1][i] = upr(w, 1);
 134                 ft_tab[2][i] = upr(w, 2);
 135                 ft_tab[3][i] = upr(w, 3);
 136                 w = bytes2word(b, 0, 0, 0);
 137
 138                 /*
 139                  * tables for last encryption round
 140                  * (may also be used in the key schedule)
 141                  */
 142                 fl_tab[0][i] = w;
 143                 fl_tab[1][i] = upr(w, 1);
 144                 fl_tab[2][i] = upr(w, 2);
 145                 fl_tab[3][i] = upr(w, 3);
 146
 147                 /*
 148                  * table for key schedule if fl_tab above is
 149                  * not of the required form
 150                  */
 151                 ls_tab[0][i] = w;
 152                 ls_tab[1][i] = upr(w, 1);
 153                 ls_tab[2][i] = upr(w, 2);
 154                 ls_tab[3][i] = upr(w, 3);
 155
 156                 b = fi(inv_affine((u8)i));
 157                 w = bytes2word(fe(b), f9(b), fd(b), fb(b));
 158
 159                 /* tables for the inverse mix column operation  */
 160                 im_tab[0][b] = w;
 161                 im_tab[1][b] = upr(w, 1);
 162                 im_tab[2][b] = upr(w, 2);
 163                 im_tab[3][b] = upr(w, 3);
 164
 165                 /* tables for a normal decryption round */
 166                 it_tab[0][i] = w;
 167                 it_tab[1][i] = upr(w,1);
 168                 it_tab[2][i] = upr(w,2);
 169                 it_tab[3][i] = upr(w,3);
 170
 171                 w = bytes2word(b, 0, 0, 0);
 172
 173                 /* tables for last decryption round */
 174                 il_tab[0][i] = w;
 175                 il_tab[1][i] = upr(w,1);
 176                 il_tab[2][i] = upr(w,2);
 177                 il_tab[3][i] = upr(w,3);
 178     }
 179 }
 180
 181 #define four_tables(x,tab,vf,rf,c)              \
 182 (       tab[0][bval(vf(x,0,c),rf(0,c))] ^       \
 183         tab[1][bval(vf(x,1,c),rf(1,c))] ^       \
 184         tab[2][bval(vf(x,2,c),rf(2,c))] ^       \
 185         tab[3][bval(vf(x,3,c),rf(3,c))]         \
 186 )
 187
 188 #define vf1(x,r,c)  (x)
 189 #define rf1(r,c)    (r)
 190 #define rf2(r,c)    ((r-c)&3)
 191
 192 #define inv_mcol(x) four_tables(x,im_tab,vf1,rf1,0)
 193 #define ls_box(x,c) four_tables(x,fl_tab,vf1,rf2,c)
 194
 195 #define ff(x) inv_mcol(x)
 196
 197 #define ke4(k,i)                                                        \
 198 {                                                                       \
 199         k[4*(i)+4] = ss[0] ^= ls_box(ss[3],3) ^ rcon_tab[i];            \
 200         k[4*(i)+5] = ss[1] ^= ss[0];                                    \
 201         k[4*(i)+6] = ss[2] ^= ss[1];                                    \
 202         k[4*(i)+7] = ss[3] ^= ss[2];                                    \
 203 }
 204
 205 #define kel4(k,i)                                                       \
 206 {                                                                       \
 207         k[4*(i)+4] = ss[0] ^= ls_box(ss[3],3) ^ rcon_tab[i];            \
 208         k[4*(i)+5] = ss[1] ^= ss[0];                                    \
 209         k[4*(i)+6] = ss[2] ^= ss[1]; k[4*(i)+7] = ss[3] ^= ss[2];       \
 210 }
 211
 212 #define ke6(k,i)                                                        \
 213 {                                                                       \
 214         k[6*(i)+ 6] = ss[0] ^= ls_box(ss[5],3) ^ rcon_tab[i];           \
 215         k[6*(i)+ 7] = ss[1] ^= ss[0];                                   \
 216         k[6*(i)+ 8] = ss[2] ^= ss[1];                                   \
 217         k[6*(i)+ 9] = ss[3] ^= ss[2];                                   \
 218         k[6*(i)+10] = ss[4] ^= ss[3];                                   \
 219         k[6*(i)+11] = ss[5] ^= ss[4];                                   \
 220 }
 221
 222 #define kel6(k,i)                                                       \
 223 {                                                                       \
 224         k[6*(i)+ 6] = ss[0] ^= ls_box(ss[5],3) ^ rcon_tab[i];           \
 225         k[6*(i)+ 7] = ss[1] ^= ss[0];                                   \
 226         k[6*(i)+ 8] = ss[2] ^= ss[1];                                   \
 227         k[6*(i)+ 9] = ss[3] ^= ss[2];                                   \
 228 }
 229
 230 #define ke8(k,i)                                                        \
 231 {                                                                       \
 232         k[8*(i)+ 8] = ss[0] ^= ls_box(ss[7],3) ^ rcon_tab[i];           \
 233         k[8*(i)+ 9] = ss[1] ^= ss[0];                                   \
 234         k[8*(i)+10] = ss[2] ^= ss[1];                                   \
 235         k[8*(i)+11] = ss[3] ^= ss[2];                                   \
 236         k[8*(i)+12] = ss[4] ^= ls_box(ss[3],0);                         \
 237         k[8*(i)+13] = ss[5] ^= ss[4];                                   \
 238         k[8*(i)+14] = ss[6] ^= ss[5];                                   \
 239         k[8*(i)+15] = ss[7] ^= ss[6];                                   \
 240 }
 241
 242 #define kel8(k,i)                                                       \
 243 {                                                                       \
 244         k[8*(i)+ 8] = ss[0] ^= ls_box(ss[7],3) ^ rcon_tab[i];           \
 245         k[8*(i)+ 9] = ss[1] ^= ss[0];                                   \
 246         k[8*(i)+10] = ss[2] ^= ss[1];                                   \
 247         k[8*(i)+11] = ss[3] ^= ss[2];                                   \
 248 }
 249
 250 #define kdf4(k,i)                                                       \
 251 {                                                                       \
 252         ss[0] = ss[0] ^ ss[2] ^ ss[1] ^ ss[3];                          \
 253         ss[1] = ss[1] ^ ss[3];                                          \
 254         ss[2] = ss[2] ^ ss[3];                                          \
 255         ss[3] = ss[3];                                                  \
 256         ss[4] = ls_box(ss[(i+3) % 4], 3) ^ rcon_tab[i];                 \
 257         ss[i % 4] ^= ss[4];                                             \
 258         ss[4] ^= k[4*(i)];                                              \
 259         k[4*(i)+4] = ff(ss[4]);                                         \
 260         ss[4] ^= k[4*(i)+1];                                            \
 261         k[4*(i)+5] = ff(ss[4]);                                         \
 262         ss[4] ^= k[4*(i)+2];                                            \
 263         k[4*(i)+6] = ff(ss[4]);                                         \
 264         ss[4] ^= k[4*(i)+3];                                            \
 265         k[4*(i)+7] = ff(ss[4]);                                         \
 266 }
 267
 268 #define kd4(k,i)                                                        \
 269 {                                                                       \
 270         ss[4] = ls_box(ss[(i+3) % 4], 3) ^ rcon_tab[i];                 \
 271         ss[i % 4] ^= ss[4];                                             \
 272         ss[4] = ff(ss[4]);                                              \
 273         k[4*(i)+4] = ss[4] ^= k[4*(i)];                                 \
 274         k[4*(i)+5] = ss[4] ^= k[4*(i)+1];                               \
 275         k[4*(i)+6] = ss[4] ^= k[4*(i)+2];                               \
 276         k[4*(i)+7] = ss[4] ^= k[4*(i)+3];                               \
 277 }
 278
 279 #define kdl4(k,i)                                                       \
 280 {                                                                       \
 281         ss[4] = ls_box(ss[(i+3) % 4], 3) ^ rcon_tab[i];                 \
 282         ss[i % 4] ^= ss[4];                                             \
 283         k[4*(i)+4] = (ss[0] ^= ss[1]) ^ ss[2] ^ ss[3];                  \
 284         k[4*(i)+5] = ss[1] ^ ss[3];                                     \
 285         k[4*(i)+6] = ss[0];                                             \
 286         k[4*(i)+7] = ss[1];                                             \
 287 }
 288
 289 #define kdf6(k,i)                                                       \
 290 {                                                                       \
 291         ss[0] ^= ls_box(ss[5],3) ^ rcon_tab[i];                         \
 292         k[6*(i)+ 6] = ff(ss[0]);                                        \
 293         ss[1] ^= ss[0];                                                 \
 294         k[6*(i)+ 7] = ff(ss[1]);                                        \
 295         ss[2] ^= ss[1];                                                 \
 296         k[6*(i)+ 8] = ff(ss[2]);                                        \
 297         ss[3] ^= ss[2];                                                 \
 298         k[6*(i)+ 9] = ff(ss[3]);                                        \
 299         ss[4] ^= ss[3];                                                 \
 300         k[6*(i)+10] = ff(ss[4]);                                        \
 301         ss[5] ^= ss[4];                                                 \
 302         k[6*(i)+11] = ff(ss[5]);                                        \
 303 }
 304
 305 #define kd6(k,i)                                                        \
 306 {                                                                       \
 307         ss[6] = ls_box(ss[5],3) ^ rcon_tab[i];                          \
 308         ss[0] ^= ss[6]; ss[6] = ff(ss[6]);                              \
 309         k[6*(i)+ 6] = ss[6] ^= k[6*(i)];                                \
 310         ss[1] ^= ss[0];                                                 \
 311         k[6*(i)+ 7] = ss[6] ^= k[6*(i)+ 1];                             \
 312         ss[2] ^= ss[1];                                                 \
 313         k[6*(i)+ 8] = ss[6] ^= k[6*(i)+ 2];                             \
 314         ss[3] ^= ss[2];                                                 \
 315         k[6*(i)+ 9] = ss[6] ^= k[6*(i)+ 3];                             \
 316         ss[4] ^= ss[3];                                                 \
 317         k[6*(i)+10] = ss[6] ^= k[6*(i)+ 4];                             \
 318         ss[5] ^= ss[4];                                                 \
 319         k[6*(i)+11] = ss[6] ^= k[6*(i)+ 5];                             \
 320 }
 321
 322 #define kdl6(k,i)                                                       \
 323 {                                                                       \
 324         ss[0] ^= ls_box(ss[5],3) ^ rcon_tab[i];                         \
 325         k[6*(i)+ 6] = ss[0];                                            \
 326         ss[1] ^= ss[0];                                                 \
 327         k[6*(i)+ 7] = ss[1];                                            \
 328         ss[2] ^= ss[1];                                                 \
 329         k[6*(i)+ 8] = ss[2];                                            \
 330         ss[3] ^= ss[2];                                                 \
 331         k[6*(i)+ 9] = ss[3];                                            \
 332 }
 333
 334 #define kdf8(k,i)                                                       \
 335 {                                                                       \
 336         ss[0] ^= ls_box(ss[7],3) ^ rcon_tab[i];                         \
 337         k[8*(i)+ 8] = ff(ss[0]);                                        \
 338         ss[1] ^= ss[0];                                                 \
 339         k[8*(i)+ 9] = ff(ss[1]);                                        \
 340         ss[2] ^= ss[1];                                                 \
 341         k[8*(i)+10] = ff(ss[2]);                                        \
 342         ss[3] ^= ss[2];                                                 \
 343         k[8*(i)+11] = ff(ss[3]);                                        \
 344         ss[4] ^= ls_box(ss[3],0);                                       \
 345         k[8*(i)+12] = ff(ss[4]);                                        \
 346         ss[5] ^= ss[4];                                                 \
 347         k[8*(i)+13] = ff(ss[5]);                                        \
 348         ss[6] ^= ss[5];                                                 \
 349         k[8*(i)+14] = ff(ss[6]);                                        \
 350         ss[7] ^= ss[6];                                                 \
 351         k[8*(i)+15] = ff(ss[7]);                                        \
 352 }
 353
 354 #define kd8(k,i)                                                        \
 355 {                                                                       \
 356         u32 __g = ls_box(ss[7],3) ^ rcon_tab[i];                        \
 357         ss[0] ^= __g;                                                   \
 358         __g = ff(__g);                                                  \
 359         k[8*(i)+ 8] = __g ^= k[8*(i)];                                  \
 360         ss[1] ^= ss[0];                                                 \
 361         k[8*(i)+ 9] = __g ^= k[8*(i)+ 1];                               \
 362         ss[2] ^= ss[1];                                                 \
 363         k[8*(i)+10] = __g ^= k[8*(i)+ 2];                               \
 364         ss[3] ^= ss[2];                                                 \
 365         k[8*(i)+11] = __g ^= k[8*(i)+ 3];                               \
 366         __g = ls_box(ss[3],0);                                          \
 367         ss[4] ^= __g;                                                   \
 368         __g = ff(__g);                                                  \
 369         k[8*(i)+12] = __g ^= k[8*(i)+ 4];                               \
 370         ss[5] ^= ss[4];                                                 \
 371         k[8*(i)+13] = __g ^= k[8*(i)+ 5];                               \
 372         ss[6] ^= ss[5];                                                 \
 373         k[8*(i)+14] = __g ^= k[8*(i)+ 6];                               \
 374         ss[7] ^= ss[6];                                                 \
 375         k[8*(i)+15] = __g ^= k[8*(i)+ 7];                               \
 376 }
 377
 378 #define kdl8(k,i)                                                       \
 379 {                                                                       \
 380         ss[0] ^= ls_box(ss[7],3) ^ rcon_tab[i];                         \
 381         k[8*(i)+ 8] = ss[0];                                            \
 382         ss[1] ^= ss[0];                                                 \
 383         k[8*(i)+ 9] = ss[1];                                            \
 384         ss[2] ^= ss[1];                                                 \
 385         k[8*(i)+10] = ss[2];                                            \
 386         ss[3] ^= ss[2];                                                 \
 387         k[8*(i)+11] = ss[3];                                            \
 388 }
 389
 390 static int
 391 aes_set_key(void *ctx_arg, const u8 *in_key, unsigned int key_len, u32 *flags)
 392 {
 393         int i;
 394         u32 ss[8];
 395         struct aes_ctx *ctx = ctx_arg;
 396
 397         /* encryption schedule */
 398
 399         ctx->ekey[0] = ss[0] = u32_in(in_key);
 400         ctx->ekey[1] = ss[1] = u32_in(in_key + 4);
 401         ctx->ekey[2] = ss[2] = u32_in(in_key + 8);
 402         ctx->ekey[3] = ss[3] = u32_in(in_key + 12);
 403
 404         switch(key_len) {
 405         case 16:
 406                 for (i = 0; i < 9; i++)
 407                         ke4(ctx->ekey, i);
 408                 kel4(ctx->ekey, 9);
 409                 ctx->rounds = 10;
 410                 break;
 411
 412         case 24:
 413                 ctx->ekey[4] = ss[4] = u32_in(in_key + 16);
 414                 ctx->ekey[5] = ss[5] = u32_in(in_key + 20);
 415                 for (i = 0; i < 7; i++)
 416                         ke6(ctx->ekey, i);
 417                 kel6(ctx->ekey, 7);
 418                 ctx->rounds = 12;
 419                 break;
 420
 421         case 32:
 422                 ctx->ekey[4] = ss[4] = u32_in(in_key + 16);
 423                 ctx->ekey[5] = ss[5] = u32_in(in_key + 20);
 424                 ctx->ekey[6] = ss[6] = u32_in(in_key + 24);
 425                 ctx->ekey[7] = ss[7] = u32_in(in_key + 28);
 426                 for (i = 0; i < 6; i++)
 427                         ke8(ctx->ekey, i);
 428                 kel8(ctx->ekey, 6);
 429                 ctx->rounds = 14;
 430                 break;
 431
 432         default:
 433                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 434                 return -EINVAL;
 435         }
 436
 437         /* decryption schedule */
 438
 439         ctx->dkey[0] = ss[0] = u32_in(in_key);
 440         ctx->dkey[1] = ss[1] = u32_in(in_key + 4);
 441         ctx->dkey[2] = ss[2] = u32_in(in_key + 8);
 442         ctx->dkey[3] = ss[3] = u32_in(in_key + 12);
 443
 444         switch (key_len) {
 445         case 16:
 446                 kdf4(ctx->dkey, 0);
 447                 for (i = 1; i < 9; i++)
 448                         kd4(ctx->dkey, i);
 449                 kdl4(ctx->dkey, 9);
 450                 break;
 451
 452         case 24:
 453                 ctx->dkey[4] = ff(ss[4] = u32_in(in_key + 16));
 454                 ctx->dkey[5] = ff(ss[5] = u32_in(in_key + 20));
 455                 kdf6(ctx->dkey, 0);
 456                 for (i = 1; i < 7; i++)
 457                         kd6(ctx->dkey, i);
 458                 kdl6(ctx->dkey, 7);
 459                 break;
 460
 461         case 32:
 462                 ctx->dkey[4] = ff(ss[4] = u32_in(in_key + 16));
 463                 ctx->dkey[5] = ff(ss[5] = u32_in(in_key + 20));
 464                 ctx->dkey[6] = ff(ss[6] = u32_in(in_key + 24));
 465                 ctx->dkey[7] = ff(ss[7] = u32_in(in_key + 28));
 466                 kdf8(ctx->dkey, 0);
 467                 for (i = 1; i < 6; i++)
 468                         kd8(ctx->dkey, i);
 469                 kdl8(ctx->dkey, 6);
 470                 break;
 471         }
 472         return 0;
 473 }
 474
 475 static inline void aes_encrypt(void *ctx, u8 *dst, const u8 *src)
 476 {
 477         aes_enc_blk(src, dst, ctx);
 478 }
 479 static inline void aes_decrypt(void *ctx, u8 *dst, const u8 *src)
 480 {
 481         aes_dec_blk(src, dst, ctx);
 482 }
 483
 484
 485 static struct crypto_alg aes_alg = {
 486         .cra_name               =       "aes",
 487         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
 488         .cra_blocksize          =       AES_BLOCK_SIZE,
 489         .cra_ctxsize            =       sizeof(struct aes_ctx),
 490         .cra_module             =       THIS_MODULE,
 491         .cra_list               =       LIST_HEAD_INIT(aes_alg.cra_list),
 492         .cra_u                  =       {
 493                 .cipher = {
 494                         .cia_min_keysize        =       AES_MIN_KEY_SIZE,
 495                         .cia_max_keysize        =       AES_MAX_KEY_SIZE,
 496                         .cia_setkey             =       aes_set_key,
 497                         .cia_encrypt            =       aes_encrypt,
 498                         .cia_decrypt            =       aes_decrypt
 499                 }
 500         }
 501 };
 502
 503 static int __init aes_init(void)
 504 {
 505         gen_tabs();
 506         return crypto_register_alg(&aes_alg);
 507 }
 508
 509 static void __exit aes_fini(void)
 510 {
 511         crypto_unregister_alg(&aes_alg);
 512 }
 513
 514 module_init(aes_init);
 515 module_exit(aes_fini);
 516
 517 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm, i586 asm optimized");
 518 MODULE_LICENSE("Dual BSD/GPL");
 519 MODULE_AUTHOR("Fruhwirth Clemens, James Morris, Brian Gladman, Adam Richter");
 520 MODULE_ALIAS("aes");