arch/x86/crypto/serpent_avx_glue.c

   1 /*
   2  * Glue Code for AVX assembler versions of Serpent Cipher
   3  *
   4  * Copyright (C) 2012 Johannes Goetzfried
   5  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   6  *
   7  * Glue code based on serpent_sse2_glue.c by:
   8  *  Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  23  * USA
  24  *
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/hardirq.h>
  29 #include <linux/types.h>
  30 #include <linux/crypto.h>
  31 #include <linux/err.h>
  32 #include <crypto/algapi.h>
  33 #include <crypto/serpent.h>
  34 #include <crypto/cryptd.h>
  35 #include <crypto/b128ops.h>
  36 #include <crypto/ctr.h>
  37 #include <crypto/lrw.h>
  38 #include <crypto/xts.h>
  39 #include <asm/xcr.h>
  40 #include <asm/xsave.h>
  41 #include <asm/crypto/serpent-avx.h>
  42 #include <asm/crypto/ablk_helper.h>
  43 #include <asm/crypto/glue_helper.h>
  44
  45 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  46 {
  47         be128 ctrblk;
  48
  49         le128_to_be128(&ctrblk, iv);
  50         le128_inc(iv);
  51
  52         __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  53         u128_xor(dst, src, (u128 *)&ctrblk);
  54 }
  55
  56 static const struct common_glue_ctx serpent_enc = {
  57         .num_funcs = 2,
  58         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  59
  60         .funcs = { {
  61                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
  62                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
  63         }, {
  64                 .num_blocks = 1,
  65                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
  66         } }
  67 };
  68
  69 static const struct common_glue_ctx serpent_ctr = {
  70         .num_funcs = 2,
  71         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  72
  73         .funcs = { {
  74                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
  75                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
  76         }, {
  77                 .num_blocks = 1,
  78                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
  79         } }
  80 };
  81
  82 static const struct common_glue_ctx serpent_dec = {
  83         .num_funcs = 2,
  84         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  85
  86         .funcs = { {
  87                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
  88                 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
  89         }, {
  90                 .num_blocks = 1,
  91                 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
  92         } }
  93 };
  94
  95 static const struct common_glue_ctx serpent_dec_cbc = {
  96         .num_funcs = 2,
  97         .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
  98
  99         .funcs = { {
 100                 .num_blocks = SERPENT_PARALLEL_BLOCKS,
 101                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
 102         }, {
 103                 .num_blocks = 1,
 104                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
 105         } }
 106 };
 107
 108 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 109                        struct scatterlist *src, unsigned int nbytes)
 110 {
 111         return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
 112 }
 113
 114 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 115                        struct scatterlist *src, unsigned int nbytes)
 116 {
 117         return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
 118 }
 119
 120 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 121                        struct scatterlist *src, unsigned int nbytes)
 122 {
 123         return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
 124                                      dst, src, nbytes);
 125 }
 126
 127 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 128                        struct scatterlist *src, unsigned int nbytes)
 129 {
 130         return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
 131                                        nbytes);
 132 }
 133
 134 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 135                      struct scatterlist *src, unsigned int nbytes)
 136 {
 137         return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 138 }
 139
 140 static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 141 {
 142         return glue_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
 143                               NULL, fpu_enabled, nbytes);
 144 }
 145
 146 static inline void serpent_fpu_end(bool fpu_enabled)
 147 {
 148         glue_fpu_end(fpu_enabled);
 149 }
 150
 151 struct crypt_priv {
 152         struct serpent_ctx *ctx;
 153         bool fpu_enabled;
 154 };
 155
 156 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 157 {
 158         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 159         struct crypt_priv *ctx = priv;
 160         int i;
 161
 162         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 163
 164         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 165                 serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
 166                 return;
 167         }
 168
 169         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 170                 __serpent_encrypt(ctx->ctx, srcdst, srcdst);
 171 }
 172
 173 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 174 {
 175         const unsigned int bsize = SERPENT_BLOCK_SIZE;
 176         struct crypt_priv *ctx = priv;
 177         int i;
 178
 179         ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
 180
 181         if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
 182                 serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
 183                 return;
 184         }
 185
 186         for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 187                 __serpent_decrypt(ctx->ctx, srcdst, srcdst);
 188 }
 189
 190 struct serpent_lrw_ctx {
 191         struct lrw_table_ctx lrw_table;
 192         struct serpent_ctx serpent_ctx;
 193 };
 194
 195 static int lrw_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 196                               unsigned int keylen)
 197 {
 198         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 199         int err;
 200
 201         err = __serpent_setkey(&ctx->serpent_ctx, key, keylen -
 202                                                         SERPENT_BLOCK_SIZE);
 203         if (err)
 204                 return err;
 205
 206         return lrw_init_table(&ctx->lrw_table, key + keylen -
 207                                                 SERPENT_BLOCK_SIZE);
 208 }
 209
 210 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 211                        struct scatterlist *src, unsigned int nbytes)
 212 {
 213         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 214         be128 buf[SERPENT_PARALLEL_BLOCKS];
 215         struct crypt_priv crypt_ctx = {
 216                 .ctx = &ctx->serpent_ctx,
 217                 .fpu_enabled = false,
 218         };
 219         struct lrw_crypt_req req = {
 220                 .tbuf = buf,
 221                 .tbuflen = sizeof(buf),
 222
 223                 .table_ctx = &ctx->lrw_table,
 224                 .crypt_ctx = &crypt_ctx,
 225                 .crypt_fn = encrypt_callback,
 226         };
 227         int ret;
 228
 229         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 230         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 231         serpent_fpu_end(crypt_ctx.fpu_enabled);
 232
 233         return ret;
 234 }
 235
 236 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 237                        struct scatterlist *src, unsigned int nbytes)
 238 {
 239         struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 240         be128 buf[SERPENT_PARALLEL_BLOCKS];
 241         struct crypt_priv crypt_ctx = {
 242                 .ctx = &ctx->serpent_ctx,
 243                 .fpu_enabled = false,
 244         };
 245         struct lrw_crypt_req req = {
 246                 .tbuf = buf,
 247                 .tbuflen = sizeof(buf),
 248
 249                 .table_ctx = &ctx->lrw_table,
 250                 .crypt_ctx = &crypt_ctx,
 251                 .crypt_fn = decrypt_callback,
 252         };
 253         int ret;
 254
 255         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 256         ret = lrw_crypt(desc, dst, src, nbytes, &req);
 257         serpent_fpu_end(crypt_ctx.fpu_enabled);
 258
 259         return ret;
 260 }
 261
 262 static void lrw_exit_tfm(struct crypto_tfm *tfm)
 263 {
 264         struct serpent_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 265
 266         lrw_free_table(&ctx->lrw_table);
 267 }
 268
 269 struct serpent_xts_ctx {
 270         struct serpent_ctx tweak_ctx;
 271         struct serpent_ctx crypt_ctx;
 272 };
 273
 274 static int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
 275                               unsigned int keylen)
 276 {
 277         struct serpent_xts_ctx *ctx = crypto_tfm_ctx(tfm);
 278         u32 *flags = &tfm->crt_flags;
 279         int err;
 280
 281         /* key consists of keys of equal size concatenated, therefore
 282          * the length must be even
 283          */
 284         if (keylen % 2) {
 285                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 286                 return -EINVAL;
 287         }
 288
 289         /* first half of xts-key is for crypt */
 290         err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
 291         if (err)
 292                 return err;
 293
 294         /* second half of xts-key is for tweak */
 295         return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
 296 }
 297
 298 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 299                        struct scatterlist *src, unsigned int nbytes)
 300 {
 301         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 302         be128 buf[SERPENT_PARALLEL_BLOCKS];
 303         struct crypt_priv crypt_ctx = {
 304                 .ctx = &ctx->crypt_ctx,
 305                 .fpu_enabled = false,
 306         };
 307         struct xts_crypt_req req = {
 308                 .tbuf = buf,
 309                 .tbuflen = sizeof(buf),
 310
 311                 .tweak_ctx = &ctx->tweak_ctx,
 312                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 313                 .crypt_ctx = &crypt_ctx,
 314                 .crypt_fn = encrypt_callback,
 315         };
 316         int ret;
 317
 318         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 319         ret = xts_crypt(desc, dst, src, nbytes, &req);
 320         serpent_fpu_end(crypt_ctx.fpu_enabled);
 321
 322         return ret;
 323 }
 324
 325 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 326                        struct scatterlist *src, unsigned int nbytes)
 327 {
 328         struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 329         be128 buf[SERPENT_PARALLEL_BLOCKS];
 330         struct crypt_priv crypt_ctx = {
 331                 .ctx = &ctx->crypt_ctx,
 332                 .fpu_enabled = false,
 333         };
 334         struct xts_crypt_req req = {
 335                 .tbuf = buf,
 336                 .tbuflen = sizeof(buf),
 337
 338                 .tweak_ctx = &ctx->tweak_ctx,
 339                 .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
 340                 .crypt_ctx = &crypt_ctx,
 341                 .crypt_fn = decrypt_callback,
 342         };
 343         int ret;
 344
 345         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 346         ret = xts_crypt(desc, dst, src, nbytes, &req);
 347         serpent_fpu_end(crypt_ctx.fpu_enabled);
 348
 349         return ret;
 350 }
 351
 352 static struct crypto_alg serpent_algs[10] = { {
 353         .cra_name               = "__ecb-serpent-avx",
 354         .cra_driver_name        = "__driver-ecb-serpent-avx",
 355         .cra_priority           = 0,
 356         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 357         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 358         .cra_ctxsize            = sizeof(struct serpent_ctx),
 359         .cra_alignmask          = 0,
 360         .cra_type               = &crypto_blkcipher_type,
 361         .cra_module             = THIS_MODULE,
 362         .cra_u = {
 363                 .blkcipher = {
 364                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 365                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 366                         .setkey         = serpent_setkey,
 367                         .encrypt        = ecb_encrypt,
 368                         .decrypt        = ecb_decrypt,
 369                 },
 370         },
 371 }, {
 372         .cra_name               = "__cbc-serpent-avx",
 373         .cra_driver_name        = "__driver-cbc-serpent-avx",
 374         .cra_priority           = 0,
 375         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 376         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 377         .cra_ctxsize            = sizeof(struct serpent_ctx),
 378         .cra_alignmask          = 0,
 379         .cra_type               = &crypto_blkcipher_type,
 380         .cra_module             = THIS_MODULE,
 381         .cra_u = {
 382                 .blkcipher = {
 383                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 384                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 385                         .setkey         = serpent_setkey,
 386                         .encrypt        = cbc_encrypt,
 387                         .decrypt        = cbc_decrypt,
 388                 },
 389         },
 390 }, {
 391         .cra_name               = "__ctr-serpent-avx",
 392         .cra_driver_name        = "__driver-ctr-serpent-avx",
 393         .cra_priority           = 0,
 394         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 395         .cra_blocksize          = 1,
 396         .cra_ctxsize            = sizeof(struct serpent_ctx),
 397         .cra_alignmask          = 0,
 398         .cra_type               = &crypto_blkcipher_type,
 399         .cra_module             = THIS_MODULE,
 400         .cra_u = {
 401                 .blkcipher = {
 402                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 403                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 404                         .ivsize         = SERPENT_BLOCK_SIZE,
 405                         .setkey         = serpent_setkey,
 406                         .encrypt        = ctr_crypt,
 407                         .decrypt        = ctr_crypt,
 408                 },
 409         },
 410 }, {
 411         .cra_name               = "__lrw-serpent-avx",
 412         .cra_driver_name        = "__driver-lrw-serpent-avx",
 413         .cra_priority           = 0,
 414         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 415         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 416         .cra_ctxsize            = sizeof(struct serpent_lrw_ctx),
 417         .cra_alignmask          = 0,
 418         .cra_type               = &crypto_blkcipher_type,
 419         .cra_module             = THIS_MODULE,
 420         .cra_exit               = lrw_exit_tfm,
 421         .cra_u = {
 422                 .blkcipher = {
 423                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 424                                           SERPENT_BLOCK_SIZE,
 425                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 426                                           SERPENT_BLOCK_SIZE,
 427                         .ivsize         = SERPENT_BLOCK_SIZE,
 428                         .setkey         = lrw_serpent_setkey,
 429                         .encrypt        = lrw_encrypt,
 430                         .decrypt        = lrw_decrypt,
 431                 },
 432         },
 433 }, {
 434         .cra_name               = "__xts-serpent-avx",
 435         .cra_driver_name        = "__driver-xts-serpent-avx",
 436         .cra_priority           = 0,
 437         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 438         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 439         .cra_ctxsize            = sizeof(struct serpent_xts_ctx),
 440         .cra_alignmask          = 0,
 441         .cra_type               = &crypto_blkcipher_type,
 442         .cra_module             = THIS_MODULE,
 443         .cra_u = {
 444                 .blkcipher = {
 445                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 446                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 447                         .ivsize         = SERPENT_BLOCK_SIZE,
 448                         .setkey         = xts_serpent_setkey,
 449                         .encrypt        = xts_encrypt,
 450                         .decrypt        = xts_decrypt,
 451                 },
 452         },
 453 }, {
 454         .cra_name               = "ecb(serpent)",
 455         .cra_driver_name        = "ecb-serpent-avx",
 456         .cra_priority           = 500,
 457         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 458         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 459         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 460         .cra_alignmask          = 0,
 461         .cra_type               = &crypto_ablkcipher_type,
 462         .cra_module             = THIS_MODULE,
 463         .cra_init               = ablk_init,
 464         .cra_exit               = ablk_exit,
 465         .cra_u = {
 466                 .ablkcipher = {
 467                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 468                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 469                         .setkey         = ablk_set_key,
 470                         .encrypt        = ablk_encrypt,
 471                         .decrypt        = ablk_decrypt,
 472                 },
 473         },
 474 }, {
 475         .cra_name               = "cbc(serpent)",
 476         .cra_driver_name        = "cbc-serpent-avx",
 477         .cra_priority           = 500,
 478         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 479         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 480         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 481         .cra_alignmask          = 0,
 482         .cra_type               = &crypto_ablkcipher_type,
 483         .cra_module             = THIS_MODULE,
 484         .cra_init               = ablk_init,
 485         .cra_exit               = ablk_exit,
 486         .cra_u = {
 487                 .ablkcipher = {
 488                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 489                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 490                         .ivsize         = SERPENT_BLOCK_SIZE,
 491                         .setkey         = ablk_set_key,
 492                         .encrypt        = __ablk_encrypt,
 493                         .decrypt        = ablk_decrypt,
 494                 },
 495         },
 496 }, {
 497         .cra_name               = "ctr(serpent)",
 498         .cra_driver_name        = "ctr-serpent-avx",
 499         .cra_priority           = 500,
 500         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 501         .cra_blocksize          = 1,
 502         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 503         .cra_alignmask          = 0,
 504         .cra_type               = &crypto_ablkcipher_type,
 505         .cra_module             = THIS_MODULE,
 506         .cra_init               = ablk_init,
 507         .cra_exit               = ablk_exit,
 508         .cra_u = {
 509                 .ablkcipher = {
 510                         .min_keysize    = SERPENT_MIN_KEY_SIZE,
 511                         .max_keysize    = SERPENT_MAX_KEY_SIZE,
 512                         .ivsize         = SERPENT_BLOCK_SIZE,
 513                         .setkey         = ablk_set_key,
 514                         .encrypt        = ablk_encrypt,
 515                         .decrypt        = ablk_encrypt,
 516                         .geniv          = "chainiv",
 517                 },
 518         },
 519 }, {
 520         .cra_name               = "lrw(serpent)",
 521         .cra_driver_name        = "lrw-serpent-avx",
 522         .cra_priority           = 500,
 523         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 524         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 525         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 526         .cra_alignmask          = 0,
 527         .cra_type               = &crypto_ablkcipher_type,
 528         .cra_module             = THIS_MODULE,
 529         .cra_init               = ablk_init,
 530         .cra_exit               = ablk_exit,
 531         .cra_u = {
 532                 .ablkcipher = {
 533                         .min_keysize    = SERPENT_MIN_KEY_SIZE +
 534                                           SERPENT_BLOCK_SIZE,
 535                         .max_keysize    = SERPENT_MAX_KEY_SIZE +
 536                                           SERPENT_BLOCK_SIZE,
 537                         .ivsize         = SERPENT_BLOCK_SIZE,
 538                         .setkey         = ablk_set_key,
 539                         .encrypt        = ablk_encrypt,
 540                         .decrypt        = ablk_decrypt,
 541                 },
 542         },
 543 }, {
 544         .cra_name               = "xts(serpent)",
 545         .cra_driver_name        = "xts-serpent-avx",
 546         .cra_priority           = 500,
 547         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 548         .cra_blocksize          = SERPENT_BLOCK_SIZE,
 549         .cra_ctxsize            = sizeof(struct async_helper_ctx),
 550         .cra_alignmask          = 0,
 551         .cra_type               = &crypto_ablkcipher_type,
 552         .cra_module             = THIS_MODULE,
 553         .cra_init               = ablk_init,
 554         .cra_exit               = ablk_exit,
 555         .cra_u = {
 556                 .ablkcipher = {
 557                         .min_keysize    = SERPENT_MIN_KEY_SIZE * 2,
 558                         .max_keysize    = SERPENT_MAX_KEY_SIZE * 2,
 559                         .ivsize         = SERPENT_BLOCK_SIZE,
 560                         .setkey         = ablk_set_key,
 561                         .encrypt        = ablk_encrypt,
 562                         .decrypt        = ablk_decrypt,
 563                 },
 564         },
 565 } };
 566
 567 static int __init serpent_init(void)
 568 {
 569         u64 xcr0;
 570
 571         if (!cpu_has_avx || !cpu_has_osxsave) {
 572                 printk(KERN_INFO "AVX instructions are not detected.\n");
 573                 return -ENODEV;
 574         }
 575
 576         xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
 577         if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
 578                 printk(KERN_INFO "AVX detected but unusable.\n");
 579                 return -ENODEV;
 580         }
 581
 582         return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 583 }
 584
 585 static void __exit serpent_exit(void)
 586 {
 587         crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
 588 }
 589
 590 module_init(serpent_init);
 591 module_exit(serpent_exit);
 592
 593 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
 594 MODULE_LICENSE("GPL");
 595 MODULE_ALIAS("serpent");